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b2f7a3aaad72fa01dc1230f246c26d878f5a41a6
neovim/src/nvim/regexp.c
zeertzjq b2f7a3aaad vim-patch:9.1.0105: Style: typos found (#27462) 
Problem:  Style: typos found
Solution: correct them
          (zeertzjq)

closes: vim/vim#14023

e71022082d
2024-02-14 06:39:47 +08:00

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// Handling of regular expressions: vim_regcomp(), vim_regexec(), vim_regsub()
// By default: do not create debugging logs or files related to regular
// expressions, even when compiling with -DDEBUG.
// Uncomment the second line to get the regexp debugging.
// #undef REGEXP_DEBUG
// #define REGEXP_DEBUG
#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <uv.h>
#include "nvim/ascii_defs.h"
#include "nvim/buffer_defs.h"
#include "nvim/charset.h"
#include "nvim/eval.h"
#include "nvim/eval/typval.h"
#include "nvim/eval/userfunc.h"
#include "nvim/garray.h"
#include "nvim/garray_defs.h"
#include "nvim/gettext_defs.h"
#include "nvim/globals.h"
#include "nvim/keycodes.h"
#include "nvim/macros_defs.h"
#include "nvim/mark.h"
#include "nvim/mark_defs.h"
#include "nvim/mbyte.h"
#include "nvim/mbyte_defs.h"
#include "nvim/memline.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/option_vars.h"
#include "nvim/os/input.h"
#include "nvim/plines.h"
#include "nvim/pos_defs.h"
#include "nvim/profile.h"
#include "nvim/regexp.h"
#include "nvim/regexp_defs.h"
#include "nvim/strings.h"
#include "nvim/types_defs.h"
#include "nvim/vim_defs.h"
enum {
/// In the NFA engine: how many braces are allowed.
/// TODO(RE): Use dynamic memory allocation instead of static, like here
NFA_MAX_BRACES = 20,
};
enum {
/// In the NFA engine: how many states are allowed.
NFA_MAX_STATES = 100000,
NFA_TOO_EXPENSIVE = -1,
};
/// Which regexp engine to use? Needed for vim_regcomp().
/// Must match with 'regexpengine'.
enum {
AUTOMATIC_ENGINE = 0,
BACKTRACKING_ENGINE = 1,
NFA_ENGINE = 2,
};
/// Structure returned by vim_regcomp() to pass on to vim_regexec().
/// This is the general structure. For the actual matcher, two specific
/// structures are used. See code below.
struct regprog {
regengine_T *engine;
unsigned regflags;
unsigned re_engine; ///< Automatic, backtracking or NFA engine.
unsigned re_flags; ///< Second argument for vim_regcomp().
bool re_in_use; ///< prog is being executed
};
/// Structure used by the back track matcher.
/// These fields are only to be used in regexp.c!
/// See regexp.c for an explanation.
typedef struct {
// These four members implement regprog_T.
regengine_T *engine;
unsigned regflags;
unsigned re_engine;
unsigned re_flags;
bool re_in_use;
int regstart;
uint8_t reganch;
uint8_t *regmust;
int regmlen;
uint8_t reghasz;
uint8_t program[];
} bt_regprog_T;
/// Structure representing a NFA state.
/// An NFA state may have no outgoing edge, when it is a NFA_MATCH state.
typedef struct nfa_state nfa_state_T;
struct nfa_state {
int c;
nfa_state_T *out;
nfa_state_T *out1;
int id;
int lastlist[2]; ///< 0: normal, 1: recursive
int val;
};
/// Structure used by the NFA matcher.
typedef struct {
// These four members implement regprog_T.
regengine_T *engine;
unsigned regflags;
unsigned re_engine;
unsigned re_flags;
bool re_in_use;
nfa_state_T *start; ///< points into state[]
int reganch; ///< pattern starts with ^
int regstart; ///< char at start of pattern
uint8_t *match_text; ///< plain text to match with
int has_zend; ///< pattern contains \ze
int has_backref; ///< pattern contains \1 .. \9
int reghasz;
char *pattern;
int nsubexp; ///< number of ()
int nstate;
nfa_state_T state[];
} nfa_regprog_T;
struct regengine {
/// bt_regcomp or nfa_regcomp
regprog_T *(*regcomp)(uint8_t *, int);
/// bt_regfree or nfa_regfree
void (*regfree)(regprog_T *);
/// bt_regexec_nl or nfa_regexec_nl
int (*regexec_nl)(regmatch_T *, uint8_t *, colnr_T, bool);
/// bt_regexec_mult or nfa_regexec_mult
int (*regexec_multi)(regmmatch_T *, win_T *, buf_T *, linenr_T, colnr_T, proftime_T *, int *);
#ifdef REGEXP_DEBUG
uint8_t *expr;
#endif
};
// Structure used to save the current input state, when it needs to be
// restored after trying a match. Used by reg_save() and reg_restore().
// Also stores the length of "backpos".
typedef struct {
union {
uint8_t *ptr; // rex.input pointer, for single-line regexp
lpos_T pos; // rex.input pos, for multi-line regexp
} rs_u;
int rs_len;
} regsave_T;
// struct to save start/end pointer/position in for \(\)
typedef struct {
union {
uint8_t *ptr;
lpos_T pos;
} se_u;
} save_se_T;
// Values for rs_state in regitem_T.
typedef enum regstate_E {
RS_NOPEN = 0, // NOPEN and NCLOSE
RS_MOPEN, // MOPEN + [0-9]
RS_MCLOSE, // MCLOSE + [0-9]
RS_ZOPEN, // ZOPEN + [0-9]
RS_ZCLOSE, // ZCLOSE + [0-9]
RS_BRANCH, // BRANCH
RS_BRCPLX_MORE, // BRACE_COMPLEX and trying one more match
RS_BRCPLX_LONG, // BRACE_COMPLEX and trying longest match
RS_BRCPLX_SHORT, // BRACE_COMPLEX and trying shortest match
RS_NOMATCH, // NOMATCH
RS_BEHIND1, // BEHIND / NOBEHIND matching rest
RS_BEHIND2, // BEHIND / NOBEHIND matching behind part
RS_STAR_LONG, // STAR/PLUS/BRACE_SIMPLE longest match
RS_STAR_SHORT, // STAR/PLUS/BRACE_SIMPLE shortest match
} regstate_T;
// When there are alternatives a regstate_T is put on the regstack to remember
// what we are doing.
// Before it may be another type of item, depending on rs_state, to remember
// more things.
typedef struct regitem_S {
regstate_T rs_state; // what we are doing, one of RS_ above
int16_t rs_no; // submatch nr or BEHIND/NOBEHIND
uint8_t *rs_scan; // current node in program
union {
save_se_T sesave;
regsave_T regsave;
} rs_un; // room for saving rex.input
} regitem_T;
// used for BEHIND and NOBEHIND matching
typedef struct regbehind_S {
regsave_T save_after;
regsave_T save_behind;
int save_need_clear_subexpr;
save_se_T save_start[NSUBEXP];
save_se_T save_end[NSUBEXP];
} regbehind_T;
// Since the out pointers in the list are always
// uninitialized, we use the pointers themselves
// as storage for the Ptrlists.
typedef union Ptrlist Ptrlist;
union Ptrlist {
Ptrlist *next;
nfa_state_T *s;
};
struct Frag {
nfa_state_T *start;
Ptrlist *out;
};
typedef struct Frag Frag_T;
typedef struct {
int in_use; ///< number of subexpr with useful info
// When REG_MULTI is true list.multi is used, otherwise list.line.
union {
struct multipos {
linenr_T start_lnum;
linenr_T end_lnum;
colnr_T start_col;
colnr_T end_col;
} multi[NSUBEXP];
struct linepos {
uint8_t *start;
uint8_t *end;
} line[NSUBEXP];
} list;
colnr_T orig_start_col; // list.multi[0].start_col without \zs
} regsub_T;
typedef struct {
regsub_T norm; // \( .. \) matches
regsub_T synt; // \z( .. \) matches
} regsubs_T;
// nfa_pim_T stores a Postponed Invisible Match.
typedef struct nfa_pim_S nfa_pim_T;
struct nfa_pim_S {
int result; // NFA_PIM_*, see below
nfa_state_T *state; // the invisible match start state
regsubs_T subs; // submatch info, only party used
union {
lpos_T pos;
uint8_t *ptr;
} end; // where the match must end
};
// nfa_thread_T contains execution information of a NFA state
typedef struct {
nfa_state_T *state;
int count;
nfa_pim_T pim; // if pim.result != NFA_PIM_UNUSED: postponed
// invisible match
regsubs_T subs; // submatch info, only party used
} nfa_thread_T;
// nfa_list_T contains the alternative NFA execution states.
typedef struct {
nfa_thread_T *t; ///< allocated array of states
int n; ///< nr of states currently in "t"
int len; ///< max nr of states in "t"
int id; ///< ID of the list
int has_pim; ///< true when any state has a PIM
} nfa_list_T;
#ifdef REGEXP_DEBUG
// show/save debugging data when BT engine is used
# define BT_REGEXP_DUMP
// save the debugging data to a file instead of displaying it
# define BT_REGEXP_LOG
# define BT_REGEXP_DEBUG_LOG
# define BT_REGEXP_DEBUG_LOG_NAME "bt_regexp_debug.log"
#endif
// Magic characters have a special meaning, they don't match literally.
// Magic characters are negative. This separates them from literal characters
// (possibly multi-byte). Only ASCII characters can be Magic.
#define Magic(x) ((int)(x) - 256)
#define un_Magic(x) ((x) + 256)
#define is_Magic(x) ((x) < 0)
typedef void (*fptr_T)(int *, int);
static int no_Magic(int x)
{
if (is_Magic(x)) {
return un_Magic(x);
}
return x;
}
static int toggle_Magic(int x)
{
if (is_Magic(x)) {
return un_Magic(x);
}
return Magic(x);
}
// The first byte of the BT regexp internal "program" is actually this magic
// number; the start node begins in the second byte. It's used to catch the
// most severe mutilation of the program by the caller.
#define REGMAGIC 0234
// Utility definitions.
#define UCHARAT(p) ((int)(*(uint8_t *)(p)))
// Used for an error (down from) vim_regcomp(): give the error message, set
// rc_did_emsg and return NULL
#define EMSG_RET_NULL(m) return (emsg(m), rc_did_emsg = true, (void *)NULL)
#define IEMSG_RET_NULL(m) return (iemsg(m), rc_did_emsg = true, (void *)NULL)
#define EMSG_RET_FAIL(m) return (emsg(m), rc_did_emsg = true, FAIL)
#define EMSG2_RET_NULL(m, c) \
return (semsg((m), (c) ? "" : "\\"), rc_did_emsg = true, (void *)NULL)
#define EMSG3_RET_NULL(m, c, a) \
return (semsg((m), (c) ? "" : "\\", (a)), rc_did_emsg = true, (void *)NULL)
#define EMSG2_RET_FAIL(m, c) \
return (semsg((m), (c) ? "" : "\\"), rc_did_emsg = true, FAIL)
#define EMSG_ONE_RET_NULL EMSG2_RET_NULL(_(e_invalid_item_in_str_brackets), reg_magic == MAGIC_ALL)
#define MAX_LIMIT (32767 << 16)
static const char e_invalid_character_after_str_at[]
= N_("E59: Invalid character after %s@");
static const char e_invalid_use_of_underscore[]
= N_("E63: Invalid use of \\_");
static const char e_pattern_uses_more_memory_than_maxmempattern[]
= N_("E363: Pattern uses more memory than 'maxmempattern'");
static const char e_invalid_item_in_str_brackets[]
= N_("E369: Invalid item in %s%%[]");
static const char e_missing_delimiter_after_search_pattern_str[]
= N_("E654: Missing delimiter after search pattern: %s");
static const char e_missingbracket[] = N_("E769: Missing ] after %s[");
static const char e_reverse_range[] = N_("E944: Reverse range in character class");
static const char e_large_class[] = N_("E945: Range too large in character class");
static const char e_unmatchedpp[] = N_("E53: Unmatched %s%%(");
static const char e_unmatchedp[] = N_("E54: Unmatched %s(");
static const char e_unmatchedpar[] = N_("E55: Unmatched %s)");
static const char e_z_not_allowed[] = N_("E66: \\z( not allowed here");
static const char e_z1_not_allowed[] = N_("E67: \\z1 - \\z9 not allowed here");
static const char e_missing_sb[] = N_("E69: Missing ] after %s%%[");
static const char e_empty_sb[] = N_("E70: Empty %s%%[]");
static const char e_recursive[] = N_("E956: Cannot use pattern recursively");
static const char e_regexp_number_after_dot_pos_search_chr[]
= N_("E1204: No Number allowed after .: '\\%%%c'");
static const char e_nfa_regexp_missing_value_in_chr[]
= N_("E1273: (NFA regexp) missing value in '\\%%%c'");
static const char e_atom_engine_must_be_at_start_of_pattern[]
= N_("E1281: Atom '\\%%#=%c' must be at the start of the pattern");
static const char e_substitute_nesting_too_deep[] = N_("E1290: substitute nesting too deep");
#define NOT_MULTI 0
#define MULTI_ONE 1
#define MULTI_MULT 2
// return values for regmatch()
#define RA_FAIL 1 // something failed, abort
#define RA_CONT 2 // continue in inner loop
#define RA_BREAK 3 // break inner loop
#define RA_MATCH 4 // successful match
#define RA_NOMATCH 5 // didn't match
/// Return NOT_MULTI if c is not a "multi" operator.
/// Return MULTI_ONE if c is a single "multi" operator.
/// Return MULTI_MULT if c is a multi "multi" operator.
static int re_multi_type(int c)
{
if (c == Magic('@') || c == Magic('=') || c == Magic('?')) {
return MULTI_ONE;
}
if (c == Magic('*') || c == Magic('+') || c == Magic('{')) {
return MULTI_MULT;
}
return NOT_MULTI;
}
static char *reg_prev_sub = NULL;
// REGEXP_INRANGE contains all characters which are always special in a []
// range after '\'.
// REGEXP_ABBR contains all characters which act as abbreviations after '\'.
// These are:
// \n - New line (NL).
// \r - Carriage Return (CR).
// \t - Tab (TAB).
// \e - Escape (ESC).
// \b - Backspace (Ctrl_H).
// \d - Character code in decimal, eg \d123
// \o - Character code in octal, eg \o80
// \x - Character code in hex, eg \x4a
// \u - Multibyte character code, eg \u20ac
// \U - Long multibyte character code, eg \U12345678
static char REGEXP_INRANGE[] = "]^-n\\";
static char REGEXP_ABBR[] = "nrtebdoxuU";
// Translate '\x' to its control character, except "\n", which is Magic.
static int backslash_trans(int c)
{
switch (c) {
case 'r':
return CAR;
case 't':
return TAB;
case 'e':
return ESC;
case 'b':
return BS;
}
return c;
}
/// Check for a character class name "[:name:]". "pp" points to the '['.
/// Returns one of the CLASS_ items. CLASS_NONE means that no item was
/// recognized. Otherwise "pp" is advanced to after the item.
static int get_char_class(char **pp)
{
static const char *(class_names[]) = {
"alnum:]",
#define CLASS_ALNUM 0
"alpha:]",
#define CLASS_ALPHA 1
"blank:]",
#define CLASS_BLANK 2
"cntrl:]",
#define CLASS_CNTRL 3
"digit:]",
#define CLASS_DIGIT 4
"graph:]",
#define CLASS_GRAPH 5
"lower:]",
#define CLASS_LOWER 6
"print:]",
#define CLASS_PRINT 7
"punct:]",
#define CLASS_PUNCT 8
"space:]",
#define CLASS_SPACE 9
"upper:]",
#define CLASS_UPPER 10
"xdigit:]",
#define CLASS_XDIGIT 11
"tab:]",
#define CLASS_TAB 12
"return:]",
#define CLASS_RETURN 13
"backspace:]",
#define CLASS_BACKSPACE 14
"escape:]",
#define CLASS_ESCAPE 15
"ident:]",
#define CLASS_IDENT 16
"keyword:]",
#define CLASS_KEYWORD 17
"fname:]",
#define CLASS_FNAME 18
};
#define CLASS_NONE 99
int i;
if ((*pp)[1] == ':') {
for (i = 0; i < (int)ARRAY_SIZE(class_names); i++) {
if (strncmp(*pp + 2, class_names[i], strlen(class_names[i])) == 0) {
*pp += strlen(class_names[i]) + 2;
return i;
}
}
}
return CLASS_NONE;
}
// Specific version of character class functions.
// Using a table to keep this fast.
static int16_t class_tab[256];
#define RI_DIGIT 0x01
#define RI_HEX 0x02
#define RI_OCTAL 0x04
#define RI_WORD 0x08
#define RI_HEAD 0x10
#define RI_ALPHA 0x20
#define RI_LOWER 0x40
#define RI_UPPER 0x80
#define RI_WHITE 0x100
static void init_class_tab(void)
{
int i;
static int done = false;
if (done) {
return;
}
for (i = 0; i < 256; i++) {
if (i >= '0' && i <= '7') {
class_tab[i] = RI_DIGIT + RI_HEX + RI_OCTAL + RI_WORD;
} else if (i >= '8' && i <= '9') {
class_tab[i] = RI_DIGIT + RI_HEX + RI_WORD;
} else if (i >= 'a' && i <= 'f') {
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
} else if (i >= 'g' && i <= 'z') {
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
} else if (i >= 'A' && i <= 'F') {
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
} else if (i >= 'G' && i <= 'Z') {
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
} else if (i == '_') {
class_tab[i] = RI_WORD + RI_HEAD;
} else {
class_tab[i] = 0;
}
}
class_tab[' '] |= RI_WHITE;
class_tab['\t'] |= RI_WHITE;
done = true;
}
#define ri_digit(c) ((c) < 0x100 && (class_tab[c] & RI_DIGIT))
#define ri_hex(c) ((c) < 0x100 && (class_tab[c] & RI_HEX))
#define ri_octal(c) ((c) < 0x100 && (class_tab[c] & RI_OCTAL))
#define ri_word(c) ((c) < 0x100 && (class_tab[c] & RI_WORD))
#define ri_head(c) ((c) < 0x100 && (class_tab[c] & RI_HEAD))
#define ri_alpha(c) ((c) < 0x100 && (class_tab[c] & RI_ALPHA))
#define ri_lower(c) ((c) < 0x100 && (class_tab[c] & RI_LOWER))
#define ri_upper(c) ((c) < 0x100 && (class_tab[c] & RI_UPPER))
#define ri_white(c) ((c) < 0x100 && (class_tab[c] & RI_WHITE))
// flags for regflags
#define RF_ICASE 1 // ignore case
#define RF_NOICASE 2 // don't ignore case
#define RF_HASNL 4 // can match a NL
#define RF_ICOMBINE 8 // ignore combining characters
#define RF_LOOKBH 16 // uses "\@<=" or "\@<!"
// Global work variables for vim_regcomp().
static char *regparse; ///< Input-scan pointer.
static int regnpar; ///< () count.
static bool wants_nfa; ///< regex should use NFA engine
static int regnzpar; ///< \z() count.
static int re_has_z; ///< \z item detected
static unsigned regflags; ///< RF_ flags for prog
static int had_eol; ///< true when EOL found by vim_regcomp()
static magic_T reg_magic; ///< magicness of the pattern
static int reg_string; // matching with a string instead of a buffer
// line
static int reg_strict; // "[abc" is illegal
// META contains all characters that may be magic, except '^' and '$'.
// uncrustify:off
// META[] is used often enough to justify turning it into a table.
static uint8_t META_flags[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// % & ( ) * + .
0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0,
// 1 2 3 4 5 6 7 8 9 < = > ?
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
// @ A C D F H I K L M O
1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
// P S U V W X Z [ _
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1,
// a c d f h i k l m n o
0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1,
// p s u v w x z { | ~
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1
};
// uncrustify:on
static int curchr; // currently parsed character
// Previous character. Note: prevchr is sometimes -1 when we are not at the
// start, eg in /[ ^I]^ the pattern was never found even if it existed,
// because ^ was taken to be magic -- webb
static int prevchr;
static int prevprevchr; // previous-previous character
static int nextchr; // used for ungetchr()
// arguments for reg()
#define REG_NOPAREN 0 // toplevel reg()
#define REG_PAREN 1 // \(\)
#define REG_ZPAREN 2 // \z(\)
#define REG_NPAREN 3 // \%(\)
typedef struct {
char *regparse;
int prevchr_len;
int curchr;
int prevchr;
int prevprevchr;
int nextchr;
int at_start;
int prev_at_start;
int regnpar;
} parse_state_T;
static regengine_T bt_regengine;
static regengine_T nfa_regengine;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "regexp.c.generated.h"
#endif
// Return true if compiled regular expression "prog" can match a line break.
int re_multiline(const regprog_T *prog)
FUNC_ATTR_NONNULL_ALL
{
return prog->regflags & RF_HASNL;
}
// Check for an equivalence class name "[=a=]". "pp" points to the '['.
// Returns a character representing the class. Zero means that no item was
// recognized. Otherwise "pp" is advanced to after the item.
static int get_equi_class(char **pp)
{
int c;
int l = 1;
char *p = *pp;
if (p[1] == '=' && p[2] != NUL) {
l = utfc_ptr2len(p + 2);
if (p[l + 2] == '=' && p[l + 3] == ']') {
c = utf_ptr2char(p + 2);
*pp += l + 4;
return c;
}
}
return 0;
}
// Check for a collating element "[.a.]". "pp" points to the '['.
// Returns a character. Zero means that no item was recognized. Otherwise
// "pp" is advanced to after the item.
// Currently only single characters are recognized!
static int get_coll_element(char **pp)
{
int c;
int l = 1;
char *p = *pp;
if (p[0] != NUL && p[1] == '.' && p[2] != NUL) {
l = utfc_ptr2len(p + 2);
if (p[l + 2] == '.' && p[l + 3] == ']') {
c = utf_ptr2char(p + 2);
*pp += l + 4;
return c;
}
}
return 0;
}
static int reg_cpo_lit; // 'cpoptions' contains 'l' flag
static void get_cpo_flags(void)
{
reg_cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL;
}
/// Skip over a "[]" range.
/// "p" must point to the character after the '['.
/// The returned pointer is on the matching ']', or the terminating NUL.
static char *skip_anyof(char *p)
{
int l;
if (*p == '^') { // Complement of range.
p++;
}
if (*p == ']' || *p == '-') {
p++;
}
while (*p != NUL && *p != ']') {
if ((l = utfc_ptr2len(p)) > 1) {
p += l;
} else if (*p == '-') {
p++;
if (*p != ']' && *p != NUL) {
MB_PTR_ADV(p);
}
} else if (*p == '\\'
&& (vim_strchr(REGEXP_INRANGE, (uint8_t)p[1]) != NULL
|| (!reg_cpo_lit
&& vim_strchr(REGEXP_ABBR, (uint8_t)p[1]) != NULL))) {
p += 2;
} else if (*p == '[') {
if (get_char_class(&p) == CLASS_NONE
&& get_equi_class(&p) == 0
&& get_coll_element(&p) == 0
&& *p != NUL) {
p++; // It is not a class name and not NUL
}
} else {
p++;
}
}
return p;
}
/// Skip past regular expression.
/// Stop at end of "startp" or where "delim" is found ('/', '?', etc).
/// Take care of characters with a backslash in front of it.
/// Skip strings inside [ and ].
char *skip_regexp(char *startp, int delim, int magic)
{
return skip_regexp_ex(startp, delim, magic, NULL, NULL, NULL);
}
/// Call skip_regexp() and when the delimiter does not match give an error and
/// return NULL.
char *skip_regexp_err(char *startp, int delim, int magic)
{
char *p = skip_regexp(startp, delim, magic);
if (*p != delim) {
semsg(_(e_missing_delimiter_after_search_pattern_str), startp);
return NULL;
}
return p;
}
/// skip_regexp() with extra arguments:
/// When "newp" is not NULL and "dirc" is '?', make an allocated copy of the
/// expression and change "\?" to "?". If "*newp" is not NULL the expression
/// is changed in-place.
/// If a "\?" is changed to "?" then "dropped" is incremented, unless NULL.
/// If "magic_val" is not NULL, returns the effective magicness of the pattern
char *skip_regexp_ex(char *startp, int dirc, int magic, char **newp, int *dropped,
magic_T *magic_val)
{
magic_T mymagic;
char *p = startp;
if (magic) {
mymagic = MAGIC_ON;
} else {
mymagic = MAGIC_OFF;
}
get_cpo_flags();
for (; p[0] != NUL; MB_PTR_ADV(p)) {
if (p[0] == dirc) { // found end of regexp
break;
}
if ((p[0] == '[' && mymagic >= MAGIC_ON)
|| (p[0] == '\\' && p[1] == '[' && mymagic <= MAGIC_OFF)) {
p = skip_anyof(p + 1);
if (p[0] == NUL) {
break;
}
} else if (p[0] == '\\' && p[1] != NUL) {
if (dirc == '?' && newp != NULL && p[1] == '?') {
// change "\?" to "?", make a copy first.
if (*newp == NULL) {
*newp = xstrdup(startp);
p = *newp + (p - startp);
}
if (dropped != NULL) {
(*dropped)++;
}
STRMOVE(p, p + 1);
} else {
p++; // skip next character
}
if (*p == 'v') {
mymagic = MAGIC_ALL;
} else if (*p == 'V') {
mymagic = MAGIC_NONE;
}
}
}
if (magic_val != NULL) {
*magic_val = mymagic;
}
return p;
}
// variables used for parsing
static int prevchr_len; // byte length of previous char
static int at_start; // True when on the first character
static int prev_at_start; // True when on the second character
// Start parsing at "str".
static void initchr(char *str)
{
regparse = str;
prevchr_len = 0;
curchr = prevprevchr = prevchr = nextchr = -1;
at_start = true;
prev_at_start = false;
}
// Save the current parse state, so that it can be restored and parsing
// starts in the same state again.
static void save_parse_state(parse_state_T *ps)
{
ps->regparse = regparse;
ps->prevchr_len = prevchr_len;
ps->curchr = curchr;
ps->prevchr = prevchr;
ps->prevprevchr = prevprevchr;
ps->nextchr = nextchr;
ps->at_start = at_start;
ps->prev_at_start = prev_at_start;
ps->regnpar = regnpar;
}
// Restore a previously saved parse state.
static void restore_parse_state(parse_state_T *ps)
{
regparse = ps->regparse;
prevchr_len = ps->prevchr_len;
curchr = ps->curchr;
prevchr = ps->prevchr;
prevprevchr = ps->prevprevchr;
nextchr = ps->nextchr;
at_start = ps->at_start;
prev_at_start = ps->prev_at_start;
regnpar = ps->regnpar;
}
// Get the next character without advancing.
static int peekchr(void)
{
static int after_slash = false;
if (curchr != -1) {
return curchr;
}
switch (curchr = (uint8_t)regparse[0]) {
case '.':
case '[':
case '~':
// magic when 'magic' is on
if (reg_magic >= MAGIC_ON) {
curchr = Magic(curchr);
}
break;
case '(':
case ')':
case '{':
case '%':
case '+':
case '=':
case '?':
case '@':
case '!':
case '&':
case '|':
case '<':
case '>':
case '#': // future ext.
case '"': // future ext.
case '\'': // future ext.
case ',': // future ext.
case '-': // future ext.
case ':': // future ext.
case ';': // future ext.
case '`': // future ext.
case '/': // Can't be used in / command
// magic only after "\v"
if (reg_magic == MAGIC_ALL) {
curchr = Magic(curchr);
}
break;
case '*':
// * is not magic as the very first character, eg "?*ptr", when
// after '^', eg "/^*ptr" and when after "\(", "\|", "\&". But
// "\(\*" is not magic, thus must be magic if "after_slash"
if (reg_magic >= MAGIC_ON
&& !at_start
&& !(prev_at_start && prevchr == Magic('^'))
&& (after_slash
|| (prevchr != Magic('(')
&& prevchr != Magic('&')
&& prevchr != Magic('|')))) {
curchr = Magic('*');
}
break;
case '^':
// '^' is only magic as the very first character and if it's after
// "\(", "\|", "\&' or "\n"
if (reg_magic >= MAGIC_OFF
&& (at_start
|| reg_magic == MAGIC_ALL
|| prevchr == Magic('(')
|| prevchr == Magic('|')
|| prevchr == Magic('&')
|| prevchr == Magic('n')
|| (no_Magic(prevchr) == '('
&& prevprevchr == Magic('%')))) {
curchr = Magic('^');
at_start = true;
prev_at_start = false;
}
break;
case '$':
// '$' is only magic as the very last char and if it's in front of
// either "\|", "\)", "\&", or "\n"
if (reg_magic >= MAGIC_OFF) {
uint8_t *p = (uint8_t *)regparse + 1;
bool is_magic_all = (reg_magic == MAGIC_ALL);
// ignore \c \C \m \M \v \V and \Z after '$'
while (p[0] == '\\' && (p[1] == 'c' || p[1] == 'C'
|| p[1] == 'm' || p[1] == 'M'
|| p[1] == 'v' || p[1] == 'V'
|| p[1] == 'Z')) {
if (p[1] == 'v') {
is_magic_all = true;
} else if (p[1] == 'm' || p[1] == 'M' || p[1] == 'V') {
is_magic_all = false;
}
p += 2;
}
if (p[0] == NUL
|| (p[0] == '\\'
&& (p[1] == '|' || p[1] == '&' || p[1] == ')'
|| p[1] == 'n'))
|| (is_magic_all
&& (p[0] == '|' || p[0] == '&' || p[0] == ')'))
|| reg_magic == MAGIC_ALL) {
curchr = Magic('$');
}
}
break;
case '\\': {
int c = (uint8_t)regparse[1];
if (c == NUL) {
curchr = '\\'; // trailing '\'
} else if (c <= '~' && META_flags[c]) {
// META contains everything that may be magic sometimes,
// except ^ and $ ("\^" and "\$" are only magic after
// "\V"). We now fetch the next character and toggle its
// magicness. Therefore, \ is so meta-magic that it is
// not in META.
curchr = -1;
prev_at_start = at_start;
at_start = false; // be able to say "/\*ptr"
regparse++;
after_slash++;
(void)peekchr();
regparse--;
after_slash--;
curchr = toggle_Magic(curchr);
} else if (vim_strchr(REGEXP_ABBR, c)) {
// Handle abbreviations, like "\t" for TAB -- webb
curchr = backslash_trans(c);
} else if (reg_magic == MAGIC_NONE && (c == '$' || c == '^')) {
curchr = toggle_Magic(c);
} else {
// Next character can never be (made) magic?
// Then backslashing it won't do anything.
curchr = utf_ptr2char(regparse + 1);
}
break;
}
default:
curchr = utf_ptr2char(regparse);
}
return curchr;
}
// Eat one lexed character. Do this in a way that we can undo it.
static void skipchr(void)
{
// peekchr() eats a backslash, do the same here
if (*regparse == '\\') {
prevchr_len = 1;
} else {
prevchr_len = 0;
}
if (regparse[prevchr_len] != NUL) {
// Exclude composing chars that utfc_ptr2len does include.
prevchr_len += utf_ptr2len(regparse + prevchr_len);
}
regparse += prevchr_len;
prev_at_start = at_start;
at_start = false;
prevprevchr = prevchr;
prevchr = curchr;
curchr = nextchr; // use previously unget char, or -1
nextchr = -1;
}
// Skip a character while keeping the value of prev_at_start for at_start.
// prevchr and prevprevchr are also kept.
static void skipchr_keepstart(void)
{
int as = prev_at_start;
int pr = prevchr;
int prpr = prevprevchr;
skipchr();
at_start = as;
prevchr = pr;
prevprevchr = prpr;
}
// Get the next character from the pattern. We know about magic and such, so
// therefore we need a lexical analyzer.
static int getchr(void)
{
int chr = peekchr();
skipchr();
return chr;
}
// put character back. Works only once!
static void ungetchr(void)
{
nextchr = curchr;
curchr = prevchr;
prevchr = prevprevchr;
at_start = prev_at_start;
prev_at_start = false;
// Backup regparse, so that it's at the same position as before the
// getchr().
regparse -= prevchr_len;
}
// Get and return the value of the hex string at the current position.
// Return -1 if there is no valid hex number.
// The position is updated:
// blahblah\%x20asdf
// before-^ ^-after
// The parameter controls the maximum number of input characters. This will be
// 2 when reading a \%x20 sequence and 4 when reading a \%u20AC sequence.
static int64_t gethexchrs(int maxinputlen)
{
int64_t nr = 0;
int c;
int i;
for (i = 0; i < maxinputlen; i++) {
c = (uint8_t)regparse[0];
if (!ascii_isxdigit(c)) {
break;
}
nr <<= 4;
nr |= hex2nr(c);
regparse++;
}
if (i == 0) {
return -1;
}
return nr;
}
// Get and return the value of the decimal string immediately after the
// current position. Return -1 for invalid. Consumes all digits.
static int64_t getdecchrs(void)
{
int64_t nr = 0;
int c;
int i;
for (i = 0;; i++) {
c = (uint8_t)regparse[0];
if (c < '0' || c > '9') {
break;
}
nr *= 10;
nr += c - '0';
regparse++;
curchr = -1; // no longer valid
}
if (i == 0) {
return -1;
}
return nr;
}
// get and return the value of the octal string immediately after the current
// position. Return -1 for invalid, or 0-255 for valid. Smart enough to handle
// numbers > 377 correctly (for example, 400 is treated as 40) and doesn't
// treat 8 or 9 as recognised characters. Position is updated:
// blahblah\%o210asdf
// before-^ ^-after
static int64_t getoctchrs(void)
{
int64_t nr = 0;
int c;
int i;
for (i = 0; i < 3 && nr < 040; i++) {
c = (uint8_t)regparse[0];
if (c < '0' || c > '7') {
break;
}
nr <<= 3;
nr |= hex2nr(c);
regparse++;
}
if (i == 0) {
return -1;
}
return nr;
}
// read_limits - Read two integers to be taken as a minimum and maximum.
// If the first character is '-', then the range is reversed.
// Should end with 'end'. If minval is missing, zero is default, if maxval is
// missing, a very big number is the default.
static int read_limits(int *minval, int *maxval)
{
int reverse = false;
char *first_char;
int tmp;
if (*regparse == '-') {
// Starts with '-', so reverse the range later.
regparse++;
reverse = true;
}
first_char = regparse;
*minval = getdigits_int(&regparse, false, 0);
if (*regparse == ',') { // There is a comma.
if (ascii_isdigit(*++regparse)) {
*maxval = getdigits_int(&regparse, false, MAX_LIMIT);
} else {
*maxval = MAX_LIMIT;
}
} else if (ascii_isdigit(*first_char)) {
*maxval = *minval; // It was \{n} or \{-n}
} else {
*maxval = MAX_LIMIT; // It was \{} or \{-}
}
if (*regparse == '\\') {
regparse++; // Allow either \{...} or \{...\}
}
if (*regparse != '}') {
EMSG2_RET_FAIL(_("E554: Syntax error in %s{...}"), reg_magic == MAGIC_ALL);
}
// Reverse the range if there was a '-', or make sure it is in the right
// order otherwise.
if ((!reverse && *minval > *maxval) || (reverse && *minval < *maxval)) {
tmp = *minval;
*minval = *maxval;
*maxval = tmp;
}
skipchr(); // let's be friends with the lexer again
return OK;
}
// vim_regexec and friends
// Global work variables for vim_regexec().
// Sometimes need to save a copy of a line. Since alloc()/free() is very
// slow, we keep one allocated piece of memory and only re-allocate it when
// it's too small. It's freed in bt_regexec_both() when finished.
static uint8_t *reg_tofree = NULL;
static unsigned reg_tofreelen;
// Structure used to store the execution state of the regex engine.
// Which ones are set depends on whether a single-line or multi-line match is
// done:
// single-line multi-line
// reg_match &regmatch_T NULL
// reg_mmatch NULL &regmmatch_T
// reg_startp reg_match->startp <invalid>
// reg_endp reg_match->endp <invalid>
// reg_startpos <invalid> reg_mmatch->startpos
// reg_endpos <invalid> reg_mmatch->endpos
// reg_win NULL window in which to search
// reg_buf curbuf buffer in which to search
// reg_firstlnum <invalid> first line in which to search
// reg_maxline 0 last line nr
// reg_line_lbr false or true false
typedef struct {
regmatch_T *reg_match;
regmmatch_T *reg_mmatch;
uint8_t **reg_startp;
uint8_t **reg_endp;
lpos_T *reg_startpos;
lpos_T *reg_endpos;
win_T *reg_win;
buf_T *reg_buf;
linenr_T reg_firstlnum;
linenr_T reg_maxline;
bool reg_line_lbr; // "\n" in string is line break
// The current match-position is remembered with these variables:
linenr_T lnum; ///< line number, relative to first line
uint8_t *line; ///< start of current line
uint8_t *input; ///< current input, points into "line"
int need_clear_subexpr; ///< subexpressions still need to be cleared
int need_clear_zsubexpr; ///< extmatch subexpressions still need to be
///< cleared
// Internal copy of 'ignorecase'. It is set at each call to vim_regexec().
// Normally it gets the value of "rm_ic" or "rmm_ic", but when the pattern
// contains '\c' or '\C' the value is overruled.
bool reg_ic;
// Similar to "reg_ic", but only for 'combining' characters. Set with \Z
// flag in the regexp. Defaults to false, always.
bool reg_icombine;
bool reg_nobreak;
// Copy of "rmm_maxcol": maximum column to search for a match. Zero when
// there is no maximum.
colnr_T reg_maxcol;
// State for the NFA engine regexec.
int nfa_has_zend; ///< NFA regexp \ze operator encountered.
int nfa_has_backref; ///< NFA regexp \1 .. \9 encountered.
int nfa_nsubexpr; ///< Number of sub expressions actually being used
///< during execution. 1 if only the whole match
///< (subexpr 0) is used.
// listid is global, so that it increases on recursive calls to
// nfa_regmatch(), which means we don't have to clear the lastlist field of
// all the states.
int nfa_listid;
int nfa_alt_listid;
int nfa_has_zsubexpr; ///< NFA regexp has \z( ), set zsubexpr.
} regexec_T;
static regexec_T rex;
static bool rex_in_use = false;
static void reg_breakcheck(void)
{
if (!rex.reg_nobreak) {
fast_breakcheck();
}
}
// Return true if character 'c' is included in 'iskeyword' option for
// "reg_buf" buffer.
static bool reg_iswordc(int c)
{
return vim_iswordc_buf(c, rex.reg_buf);
}
// Get pointer to the line "lnum", which is relative to "reg_firstlnum".
static char *reg_getline(linenr_T lnum)
{
// when looking behind for a match/no-match lnum is negative. But we
// can't go before line 1
if (rex.reg_firstlnum + lnum < 1) {
return NULL;
}
if (lnum > rex.reg_maxline) {
// Must have matched the "\n" in the last line.
return "";
}
return ml_get_buf(rex.reg_buf, rex.reg_firstlnum + lnum);
}
static uint8_t *reg_startzp[NSUBEXP]; // Workspace to mark beginning
static uint8_t *reg_endzp[NSUBEXP]; // and end of \z(...\) matches
static lpos_T reg_startzpos[NSUBEXP]; // idem, beginning pos
static lpos_T reg_endzpos[NSUBEXP]; // idem, end pos
// true if using multi-line regexp.
#define REG_MULTI (rex.reg_match == NULL)
// Create a new extmatch and mark it as referenced once.
static reg_extmatch_T *make_extmatch(void)
FUNC_ATTR_NONNULL_RET
{
reg_extmatch_T *em = xcalloc(1, sizeof(reg_extmatch_T));
em->refcnt = 1;
return em;
}
// Add a reference to an extmatch.
reg_extmatch_T *ref_extmatch(reg_extmatch_T *em)
{
if (em != NULL) {
em->refcnt++;
}
return em;
}
// Remove a reference to an extmatch. If there are no references left, free
// the info.
void unref_extmatch(reg_extmatch_T *em)
{
int i;
if (em != NULL && --em->refcnt <= 0) {
for (i = 0; i < NSUBEXP; i++) {
xfree(em->matches[i]);
}
xfree(em);
}
}
// Get class of previous character.
static int reg_prev_class(void)
{
if (rex.input > rex.line) {
return mb_get_class_tab((char *)rex.input - 1 -
utf_head_off((char *)rex.line, (char *)rex.input - 1),
rex.reg_buf->b_chartab);
}
return -1;
}
// Return true if the current rex.input position matches the Visual area.
static bool reg_match_visual(void)
{
pos_T top, bot;
linenr_T lnum;
colnr_T col;
win_T *wp = rex.reg_win == NULL ? curwin : rex.reg_win;
int mode;
colnr_T start, end;
colnr_T start2, end2;
colnr_T curswant;
// Check if the buffer is the current buffer and not using a string.
if (rex.reg_buf != curbuf || VIsual.lnum == 0 || !REG_MULTI) {
return false;
}
if (VIsual_active) {
if (lt(VIsual, wp->w_cursor)) {
top = VIsual;
bot = wp->w_cursor;
} else {
top = wp->w_cursor;
bot = VIsual;
}
mode = VIsual_mode;
curswant = wp->w_curswant;
} else {
if (lt(curbuf->b_visual.vi_start, curbuf->b_visual.vi_end)) {
top = curbuf->b_visual.vi_start;
bot = curbuf->b_visual.vi_end;
} else {
top = curbuf->b_visual.vi_end;
bot = curbuf->b_visual.vi_start;
}
// a substitute command may have removed some lines
if (bot.lnum > curbuf->b_ml.ml_line_count) {
bot.lnum = curbuf->b_ml.ml_line_count;
}
mode = curbuf->b_visual.vi_mode;
curswant = curbuf->b_visual.vi_curswant;
}
lnum = rex.lnum + rex.reg_firstlnum;
if (lnum < top.lnum || lnum > bot.lnum) {
return false;
}
col = (colnr_T)(rex.input - rex.line);
if (mode == 'v') {
if ((lnum == top.lnum && col < top.col)
|| (lnum == bot.lnum && col >= bot.col + (*p_sel != 'e'))) {
return false;
}
} else if (mode == Ctrl_V) {
getvvcol(wp, &top, &start, NULL, &end);
getvvcol(wp, &bot, &start2, NULL, &end2);
if (start2 < start) {
start = start2;
}
if (end2 > end) {
end = end2;
}
if (top.col == MAXCOL || bot.col == MAXCOL || curswant == MAXCOL) {
end = MAXCOL;
}
// getvvcol() flushes rex.line, need to get it again
rex.line = (uint8_t *)reg_getline(rex.lnum);
rex.input = rex.line + col;
colnr_T cols = win_linetabsize(wp, rex.reg_firstlnum + rex.lnum, (char *)rex.line, col);
if (cols < start || cols > end - (*p_sel == 'e')) {
return false;
}
}
return true;
}
// Check the regexp program for its magic number.
// Return true if it's wrong.
static int prog_magic_wrong(void)
{
regprog_T *prog;
prog = REG_MULTI ? rex.reg_mmatch->regprog : rex.reg_match->regprog;
if (prog->engine == &nfa_regengine) {
// For NFA matcher we don't check the magic
return false;
}
if (UCHARAT(((bt_regprog_T *)prog)->program) != REGMAGIC) {
emsg(_(e_re_corr));
return true;
}
return false;
}
// Cleanup the subexpressions, if this wasn't done yet.
// This construction is used to clear the subexpressions only when they are
// used (to increase speed).
static void cleanup_subexpr(void)
{
if (!rex.need_clear_subexpr) {
return;
}
if (REG_MULTI) {
// Use 0xff to set lnum to -1
memset(rex.reg_startpos, 0xff, sizeof(lpos_T) * NSUBEXP);
memset(rex.reg_endpos, 0xff, sizeof(lpos_T) * NSUBEXP);
} else {
memset(rex.reg_startp, 0, sizeof(char *) * NSUBEXP);
memset(rex.reg_endp, 0, sizeof(char *) * NSUBEXP);
}
rex.need_clear_subexpr = false;
}
static void cleanup_zsubexpr(void)
{
if (!rex.need_clear_zsubexpr) {
return;
}
if (REG_MULTI) {
// Use 0xff to set lnum to -1
memset(reg_startzpos, 0xff, sizeof(lpos_T) * NSUBEXP);
memset(reg_endzpos, 0xff, sizeof(lpos_T) * NSUBEXP);
} else {
memset(reg_startzp, 0, sizeof(char *) * NSUBEXP);
memset(reg_endzp, 0, sizeof(char *) * NSUBEXP);
}
rex.need_clear_zsubexpr = false;
}
// Advance rex.lnum, rex.line and rex.input to the next line.
static void reg_nextline(void)
{
rex.line = (uint8_t *)reg_getline(++rex.lnum);
rex.input = rex.line;
reg_breakcheck();
}
// Check whether a backreference matches.
// Returns RA_FAIL, RA_NOMATCH or RA_MATCH.
// If "bytelen" is not NULL, it is set to the byte length of the match in the
// last line.
static int match_with_backref(linenr_T start_lnum, colnr_T start_col, linenr_T end_lnum,
colnr_T end_col, int *bytelen)
{
linenr_T clnum = start_lnum;
colnr_T ccol = start_col;
int len;
char *p;
if (bytelen != NULL) {
*bytelen = 0;
}
while (true) {
// Since getting one line may invalidate the other, need to make copy.
// Slow!
if (rex.line != reg_tofree) {
len = (int)strlen((char *)rex.line);
if (reg_tofree == NULL || len >= (int)reg_tofreelen) {
len += 50; // get some extra
xfree(reg_tofree);
reg_tofree = xmalloc((size_t)len);
reg_tofreelen = (unsigned)len;
}
STRCPY(reg_tofree, rex.line);
rex.input = reg_tofree + (rex.input - rex.line);
rex.line = reg_tofree;
}
// Get the line to compare with.
p = reg_getline(clnum);
assert(p);
if (clnum == end_lnum) {
len = end_col - ccol;
} else {
len = (int)strlen(p + ccol);
}
if (cstrncmp(p + ccol, (char *)rex.input, &len) != 0) {
return RA_NOMATCH; // doesn't match
}
if (bytelen != NULL) {
*bytelen += len;
}
if (clnum == end_lnum) {
break; // match and at end!
}
if (rex.lnum >= rex.reg_maxline) {
return RA_NOMATCH; // text too short
}
// Advance to next line.
reg_nextline();
if (bytelen != NULL) {
*bytelen = 0;
}
clnum++;
ccol = 0;
if (got_int) {
return RA_FAIL;
}
}
// found a match! Note that rex.line may now point to a copy of the line,
// that should not matter.
return RA_MATCH;
}
/// Used in a place where no * or \+ can follow.
static bool re_mult_next(char *what)
{
if (re_multi_type(peekchr()) == MULTI_MULT) {
semsg(_("E888: (NFA regexp) cannot repeat %s"), what);
rc_did_emsg = true;
return false;
}
return true;
}
typedef struct {
int a, b, c;
} decomp_T;
// 0xfb20 - 0xfb4f
static decomp_T decomp_table[0xfb4f - 0xfb20 + 1] = {
{ 0x5e2, 0, 0 }, // 0xfb20 alt ayin
{ 0x5d0, 0, 0 }, // 0xfb21 alt alef
{ 0x5d3, 0, 0 }, // 0xfb22 alt dalet
{ 0x5d4, 0, 0 }, // 0xfb23 alt he
{ 0x5db, 0, 0 }, // 0xfb24 alt kaf
{ 0x5dc, 0, 0 }, // 0xfb25 alt lamed
{ 0x5dd, 0, 0 }, // 0xfb26 alt mem-sofit
{ 0x5e8, 0, 0 }, // 0xfb27 alt resh
{ 0x5ea, 0, 0 }, // 0xfb28 alt tav
{ '+', 0, 0 }, // 0xfb29 alt plus
{ 0x5e9, 0x5c1, 0 }, // 0xfb2a shin+shin-dot
{ 0x5e9, 0x5c2, 0 }, // 0xfb2b shin+sin-dot
{ 0x5e9, 0x5c1, 0x5bc }, // 0xfb2c shin+shin-dot+dagesh
{ 0x5e9, 0x5c2, 0x5bc }, // 0xfb2d shin+sin-dot+dagesh
{ 0x5d0, 0x5b7, 0 }, // 0xfb2e alef+patah
{ 0x5d0, 0x5b8, 0 }, // 0xfb2f alef+qamats
{ 0x5d0, 0x5b4, 0 }, // 0xfb30 alef+hiriq
{ 0x5d1, 0x5bc, 0 }, // 0xfb31 bet+dagesh
{ 0x5d2, 0x5bc, 0 }, // 0xfb32 gimel+dagesh
{ 0x5d3, 0x5bc, 0 }, // 0xfb33 dalet+dagesh
{ 0x5d4, 0x5bc, 0 }, // 0xfb34 he+dagesh
{ 0x5d5, 0x5bc, 0 }, // 0xfb35 vav+dagesh
{ 0x5d6, 0x5bc, 0 }, // 0xfb36 zayin+dagesh
{ 0xfb37, 0, 0 }, // 0xfb37 -- UNUSED
{ 0x5d8, 0x5bc, 0 }, // 0xfb38 tet+dagesh
{ 0x5d9, 0x5bc, 0 }, // 0xfb39 yud+dagesh
{ 0x5da, 0x5bc, 0 }, // 0xfb3a kaf sofit+dagesh
{ 0x5db, 0x5bc, 0 }, // 0xfb3b kaf+dagesh
{ 0x5dc, 0x5bc, 0 }, // 0xfb3c lamed+dagesh
{ 0xfb3d, 0, 0 }, // 0xfb3d -- UNUSED
{ 0x5de, 0x5bc, 0 }, // 0xfb3e mem+dagesh
{ 0xfb3f, 0, 0 }, // 0xfb3f -- UNUSED
{ 0x5e0, 0x5bc, 0 }, // 0xfb40 nun+dagesh
{ 0x5e1, 0x5bc, 0 }, // 0xfb41 samech+dagesh
{ 0xfb42, 0, 0 }, // 0xfb42 -- UNUSED
{ 0x5e3, 0x5bc, 0 }, // 0xfb43 pe sofit+dagesh
{ 0x5e4, 0x5bc, 0 }, // 0xfb44 pe+dagesh
{ 0xfb45, 0, 0 }, // 0xfb45 -- UNUSED
{ 0x5e6, 0x5bc, 0 }, // 0xfb46 tsadi+dagesh
{ 0x5e7, 0x5bc, 0 }, // 0xfb47 qof+dagesh
{ 0x5e8, 0x5bc, 0 }, // 0xfb48 resh+dagesh
{ 0x5e9, 0x5bc, 0 }, // 0xfb49 shin+dagesh
{ 0x5ea, 0x5bc, 0 }, // 0xfb4a tav+dagesh
{ 0x5d5, 0x5b9, 0 }, // 0xfb4b vav+holam
{ 0x5d1, 0x5bf, 0 }, // 0xfb4c bet+rafe
{ 0x5db, 0x5bf, 0 }, // 0xfb4d kaf+rafe
{ 0x5e4, 0x5bf, 0 }, // 0xfb4e pe+rafe
{ 0x5d0, 0x5dc, 0 } // 0xfb4f alef-lamed
};
static void mb_decompose(int c, int *c1, int *c2, int *c3)
{
decomp_T d;
if (c >= 0xfb20 && c <= 0xfb4f) {
d = decomp_table[c - 0xfb20];
*c1 = d.a;
*c2 = d.b;
*c3 = d.c;
} else {
*c1 = c;
*c2 = *c3 = 0;
}
}
/// Compare two strings, ignore case if rex.reg_ic set.
/// Return 0 if strings match, non-zero otherwise.
/// Correct the length "*n" when composing characters are ignored.
static int cstrncmp(char *s1, char *s2, int *n)
{
int result;
if (!rex.reg_ic) {
result = strncmp(s1, s2, (size_t)(*n));
} else {
assert(*n >= 0);
result = mb_strnicmp(s1, s2, (size_t)(*n));
}
// if it failed and it's utf8 and we want to combineignore:
if (result != 0 && rex.reg_icombine) {
const char *str1, *str2;
int c1, c2, c11, c12;
int junk;
// we have to handle the strcmp ourselves, since it is necessary to
// deal with the composing characters by ignoring them:
str1 = s1;
str2 = s2;
c1 = c2 = 0;
while ((int)(str1 - s1) < *n) {
c1 = mb_ptr2char_adv(&str1);
c2 = mb_ptr2char_adv(&str2);
// decompose the character if necessary, into 'base' characters
// because I don't care about Arabic, I will hard-code the Hebrew
// which I *do* care about! So sue me...
if (c1 != c2 && (!rex.reg_ic || utf_fold(c1) != utf_fold(c2))) {
// decomposition necessary?
mb_decompose(c1, &c11, &junk, &junk);
mb_decompose(c2, &c12, &junk, &junk);
c1 = c11;
c2 = c12;
if (c11 != c12 && (!rex.reg_ic || utf_fold(c11) != utf_fold(c12))) {
break;
}
}
}
result = c2 - c1;
if (result == 0) {
*n = (int)(str2 - s2);
}
}
return result;
}
/// Wrapper around strchr which accounts for case-insensitive searches and
/// non-ASCII characters.
///
/// This function is used a lot for simple searches, keep it fast!
///
/// @param s string to search
/// @param c character to find in @a s
///
/// @return NULL if no match, otherwise pointer to the position in @a s
static inline char *cstrchr(const char *const s, const int c)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
FUNC_ATTR_ALWAYS_INLINE
{
if (!rex.reg_ic) {
return vim_strchr(s, c);
}
// Use folded case for UTF-8, slow! For ASCII use libc strpbrk which is
// expected to be highly optimized.
if (c > 0x80) {
const int folded_c = utf_fold(c);
for (const char *p = s; *p != NUL; p += utfc_ptr2len(p)) {
if (utf_fold(utf_ptr2char(p)) == folded_c) {
return (char *)p;
}
}
return NULL;
}
int cc;
if (ASCII_ISUPPER(c)) {
cc = TOLOWER_ASC(c);
} else if (ASCII_ISLOWER(c)) {
cc = TOUPPER_ASC(c);
} else {
return vim_strchr(s, c);
}
char tofind[] = { (char)c, (char)cc, NUL };
return strpbrk(s, tofind);
}
////////////////////////////////////////////////////////////////
// regsub stuff //
////////////////////////////////////////////////////////////////
static void do_upper(int *d, int c)
{
*d = mb_toupper(c);
}
static void do_lower(int *d, int c)
{
*d = mb_tolower(c);
}
/// regtilde(): Replace tildes in the pattern by the old pattern.
///
/// Short explanation of the tilde: It stands for the previous replacement
/// pattern. If that previous pattern also contains a ~ we should go back a
/// step further... But we insert the previous pattern into the current one
/// and remember that.
/// This still does not handle the case where "magic" changes. So require the
/// user to keep his hands off of "magic".
///
/// The tildes are parsed once before the first call to vim_regsub().
char *regtilde(char *source, int magic, bool preview)
{
char *newsub = source;
for (char *p = newsub; *p; p++) {
if ((*p == '~' && magic) || (*p == '\\' && *(p + 1) == '~' && !magic)) {
if (reg_prev_sub != NULL) {
// length = len(newsub) - 1 + len(prev_sub) + 1
// Avoid making the text longer than MAXCOL, it will cause
// trouble at some point.
size_t prevsublen = strlen(reg_prev_sub);
size_t newsublen = strlen(newsub);
if (prevsublen > MAXCOL || newsublen > MAXCOL
|| newsublen + prevsublen > MAXCOL) {
emsg(_(e_resulting_text_too_long));
break;
}
char *tmpsub = xmalloc(newsublen + prevsublen);
// copy prefix
size_t prefixlen = (size_t)(p - newsub); // not including ~
memmove(tmpsub, newsub, prefixlen);
// interpret tilde
memmove(tmpsub + prefixlen, reg_prev_sub, prevsublen);
// copy postfix
if (!magic) {
p++; // back off backslash
}
STRCPY(tmpsub + prefixlen + prevsublen, p + 1);
if (newsub != source) { // allocated newsub before
xfree(newsub);
}
newsub = tmpsub;
p = newsub + prefixlen + prevsublen;
} else if (magic) {
STRMOVE(p, p + 1); // remove '~'
} else {
STRMOVE(p, p + 2); // remove '\~'
}
p--;
} else {
if (*p == '\\' && p[1]) { // skip escaped characters
p++;
}
p += utfc_ptr2len(p) - 1;
}
}
// Only change reg_prev_sub when not previewing.
if (!preview) {
// Store a copy of newsub in reg_prev_sub. It is always allocated,
// because recursive calls may make the returned string invalid.
xfree(reg_prev_sub);
reg_prev_sub = xstrdup(newsub);
}
return newsub;
}
static bool can_f_submatch = false; // true when submatch() can be used
// These pointers are used for reg_submatch(). Needed for when the
// substitution string is an expression that contains a call to substitute()
// and submatch().
typedef struct {
regmatch_T *sm_match;
regmmatch_T *sm_mmatch;
linenr_T sm_firstlnum;
linenr_T sm_maxline;
int sm_line_lbr;
} regsubmatch_T;
static regsubmatch_T rsm; // can only be used when can_f_submatch is true
/// Put the submatches in "argv[argskip]" which is a list passed into
/// call_func() by vim_regsub_both().
static int fill_submatch_list(int argc FUNC_ATTR_UNUSED, typval_T *argv, int argskip, ufunc_T *fp)
FUNC_ATTR_NONNULL_ALL
{
typval_T *listarg = argv + argskip;
if (!fp->uf_varargs && fp->uf_args.ga_len <= argskip) {
// called function doesn't take a submatches argument
return argskip;
}
// Relies on sl_list to be the first item in staticList10_T.
tv_list_init_static10((staticList10_T *)listarg->vval.v_list);
// There are always 10 list items in staticList10_T.
listitem_T *li = tv_list_first(listarg->vval.v_list);
for (int i = 0; i < 10; i++) {
char *s = rsm.sm_match->startp[i];
if (s == NULL || rsm.sm_match->endp[i] == NULL) {
s = NULL;
} else {
s = xstrnsave(s, (size_t)(rsm.sm_match->endp[i] - s));
}
TV_LIST_ITEM_TV(li)->v_type = VAR_STRING;
TV_LIST_ITEM_TV(li)->vval.v_string = s;
li = TV_LIST_ITEM_NEXT(argv->vval.v_list, li);
}
return argskip + 1;
}
static void clear_submatch_list(staticList10_T *sl)
{
TV_LIST_ITER(&sl->sl_list, li, {
xfree(TV_LIST_ITEM_TV(li)->vval.v_string);
});
}
/// vim_regsub() - perform substitutions after a vim_regexec() or
/// vim_regexec_multi() match.
///
/// If "flags" has REGSUB_COPY really copy into "dest[destlen]".
/// Otherwise nothing is copied, only compute the length of the result.
///
/// If "flags" has REGSUB_MAGIC then behave like 'magic' is set.
///
/// If "flags" has REGSUB_BACKSLASH a backslash will be removed later, need to
/// double them to keep them, and insert a backslash before a CR to avoid it
/// being replaced with a line break later.
///
/// Note: The matched text must not change between the call of
/// vim_regexec()/vim_regexec_multi() and vim_regsub()! It would make the back
/// references invalid!
///
/// Returns the size of the replacement, including terminating NUL.
int vim_regsub(regmatch_T *rmp, char *source, typval_T *expr, char *dest, int destlen, int flags)
{
regexec_T rex_save;
bool rex_in_use_save = rex_in_use;
if (rex_in_use) {
// Being called recursively, save the state.
rex_save = rex;
}
rex_in_use = true;
rex.reg_match = rmp;
rex.reg_mmatch = NULL;
rex.reg_maxline = 0;
rex.reg_buf = curbuf;
rex.reg_line_lbr = true;
int result = vim_regsub_both(source, expr, dest, destlen, flags);
rex_in_use = rex_in_use_save;
if (rex_in_use) {
rex = rex_save;
}
return result;
}
int vim_regsub_multi(regmmatch_T *rmp, linenr_T lnum, char *source, char *dest, int destlen,
int flags)
{
regexec_T rex_save;
bool rex_in_use_save = rex_in_use;
if (rex_in_use) {
// Being called recursively, save the state.
rex_save = rex;
}
rex_in_use = true;
rex.reg_match = NULL;
rex.reg_mmatch = rmp;
rex.reg_buf = curbuf; // always works on the current buffer!
rex.reg_firstlnum = lnum;
rex.reg_maxline = curbuf->b_ml.ml_line_count - lnum;
rex.reg_line_lbr = false;
int result = vim_regsub_both(source, NULL, dest, destlen, flags);
rex_in_use = rex_in_use_save;
if (rex_in_use) {
rex = rex_save;
}
return result;
}
// When nesting more than a couple levels it's probably a mistake.
#define MAX_REGSUB_NESTING 4
static char *eval_result[MAX_REGSUB_NESTING] = { NULL, NULL, NULL, NULL };
#if defined(EXITFREE)
void free_resub_eval_result(void)
{
for (int i = 0; i < MAX_REGSUB_NESTING; i++) {
XFREE_CLEAR(eval_result[i]);
}
}
#endif
static int vim_regsub_both(char *source, typval_T *expr, char *dest, int destlen, int flags)
{
char *src;
char *dst;
char *s;
int c;
int cc;
int no = -1;
fptr_T func_all = (fptr_T)NULL;
fptr_T func_one = (fptr_T)NULL;
linenr_T clnum = 0; // init for GCC
int len = 0; // init for GCC
static int nesting = 0;
bool copy = flags & REGSUB_COPY;
// Be paranoid...
if ((source == NULL && expr == NULL) || dest == NULL) {
emsg(_(e_null));
return 0;
}
if (prog_magic_wrong()) {
return 0;
}
if (nesting == MAX_REGSUB_NESTING) {
emsg(_(e_substitute_nesting_too_deep));
return 0;
}
int nested = nesting;
src = source;
dst = dest;
// When the substitute part starts with "\=" evaluate it as an expression.
if (expr != NULL || (source[0] == '\\' && source[1] == '=')) {
// To make sure that the length doesn't change between checking the
// length and copying the string, and to speed up things, the
// resulting string is saved from the call with
// "flags & REGSUB_COPY" == 0 to the call with
// "flags & REGSUB_COPY" != 0.
if (copy) {
size_t reslen = eval_result[nested] != NULL ? strlen(eval_result[nested]) : 0;
if (eval_result[nested] != NULL && reslen < (size_t)destlen) {
STRCPY(dest, eval_result[nested]);
dst += reslen;
XFREE_CLEAR(eval_result[nested]);
}
} else {
const bool prev_can_f_submatch = can_f_submatch;
regsubmatch_T rsm_save;
XFREE_CLEAR(eval_result[nested]);
// The expression may contain substitute(), which calls us
// recursively. Make sure submatch() gets the text from the first
// level.
if (can_f_submatch) {
rsm_save = rsm;
}
can_f_submatch = true;
rsm.sm_match = rex.reg_match;
rsm.sm_mmatch = rex.reg_mmatch;
rsm.sm_firstlnum = rex.reg_firstlnum;
rsm.sm_maxline = rex.reg_maxline;
rsm.sm_line_lbr = rex.reg_line_lbr;
// Although unlikely, it is possible that the expression invokes a
// substitute command (it might fail, but still). Therefore keep
// an array of eval results.
nesting++;
if (expr != NULL) {
typval_T argv[2];
typval_T rettv;
staticList10_T matchList = TV_LIST_STATIC10_INIT;
rettv.v_type = VAR_STRING;
rettv.vval.v_string = NULL;
argv[0].v_type = VAR_LIST;
argv[0].vval.v_list = &matchList.sl_list;
funcexe_T funcexe = FUNCEXE_INIT;
funcexe.fe_argv_func = fill_submatch_list;
funcexe.fe_evaluate = true;
if (expr->v_type == VAR_FUNC) {
s = expr->vval.v_string;
call_func(s, -1, &rettv, 1, argv, &funcexe);
} else if (expr->v_type == VAR_PARTIAL) {
partial_T *partial = expr->vval.v_partial;
s = partial_name(partial);
funcexe.fe_partial = partial;
call_func(s, -1, &rettv, 1, argv, &funcexe);
}
if (tv_list_len(&matchList.sl_list) > 0) {
// fill_submatch_list() was called.
clear_submatch_list(&matchList);
}
if (rettv.v_type == VAR_UNKNOWN) {
// something failed, no need to report another error
eval_result[nested] = NULL;
} else {
char buf[NUMBUFLEN];
eval_result[nested] = (char *)tv_get_string_buf_chk(&rettv, buf);
if (eval_result[nested] != NULL) {
eval_result[nested] = xstrdup(eval_result[nested]);
}
}
tv_clear(&rettv);
} else {
eval_result[nested] = eval_to_string(source + 2, true);
}
nesting--;
if (eval_result[nested] != NULL) {
int had_backslash = false;
for (s = eval_result[nested]; *s != NUL; MB_PTR_ADV(s)) {
// Change NL to CR, so that it becomes a line break,
// unless called from vim_regexec_nl().
// Skip over a backslashed character.
if (*s == NL && !rsm.sm_line_lbr) {
*s = CAR;
} else if (*s == '\\' && s[1] != NUL) {
s++;
// Change NL to CR here too, so that this works:
// :s/abc\\\ndef/\="aaa\\\nbbb"/ on text:
// abc{backslash}
// def
// Not when called from vim_regexec_nl().
if (*s == NL && !rsm.sm_line_lbr) {
*s = CAR;
}
had_backslash = true;
}
}
if (had_backslash && (flags & REGSUB_BACKSLASH)) {
// Backslashes will be consumed, need to double them.
s = vim_strsave_escaped(eval_result[nested], "\\");
xfree(eval_result[nested]);
eval_result[nested] = s;
}
dst += strlen(eval_result[nested]);
}
can_f_submatch = prev_can_f_submatch;
if (can_f_submatch) {
rsm = rsm_save;
}
}
} else {
while ((c = (uint8_t)(*src++)) != NUL) {
if (c == '&' && (flags & REGSUB_MAGIC)) {
no = 0;
} else if (c == '\\' && *src != NUL) {
if (*src == '&' && !(flags & REGSUB_MAGIC)) {
src++;
no = 0;
} else if ('0' <= *src && *src <= '9') {
no = *src++ - '0';
} else if (vim_strchr("uUlLeE", (uint8_t)(*src))) {
switch (*src++) {
case 'u':
func_one = do_upper;
continue;
case 'U':
func_all = do_upper;
continue;
case 'l':
func_one = do_lower;
continue;
case 'L':
func_all = do_lower;
continue;
case 'e':
case 'E':
func_one = func_all = (fptr_T)NULL;
continue;
}
}
}
if (no < 0) { // Ordinary character.
if (c == K_SPECIAL && src[0] != NUL && src[1] != NUL) {
// Copy a special key as-is.
if (copy) {
if (dst + 3 > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
*dst++ = (char)c;
*dst++ = *src++;
*dst++ = *src++;
} else {
dst += 3;
src += 2;
}
continue;
}
if (c == '\\' && *src != NUL) {
// Check for abbreviations -- webb
switch (*src) {
case 'r':
c = CAR; ++src; break;
case 'n':
c = NL; ++src; break;
case 't':
c = TAB; ++src; break;
// Oh no! \e already has meaning in subst pat :-(
// case 'e': c = ESC; ++src; break;
case 'b':
c = Ctrl_H; ++src; break;
// If "backslash" is true the backslash will be removed
// later. Used to insert a literal CR.
default:
if (flags & REGSUB_BACKSLASH) {
if (copy) {
if (dst + 1 > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
*dst = '\\';
}
dst++;
}
c = (uint8_t)(*src++);
}
} else {
c = utf_ptr2char(src - 1);
}
// Write to buffer, if copy is set.
if (func_one != NULL) {
func_one(&cc, c);
func_one = NULL;
} else if (func_all != NULL) {
func_all(&cc, c);
} else {
// just copy
cc = c;
}
int totlen = utfc_ptr2len(src - 1);
int charlen = utf_char2len(cc);
if (copy) {
if (dst + charlen > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
utf_char2bytes(cc, dst);
}
dst += charlen - 1;
int clen = utf_ptr2len(src - 1);
// If the character length is shorter than "totlen", there
// are composing characters; copy them as-is.
if (clen < totlen) {
if (copy) {
if (dst + totlen - clen > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
memmove(dst + 1, src - 1 + clen, (size_t)(totlen - clen));
}
dst += totlen - clen;
}
src += totlen - 1;
dst++;
} else {
if (REG_MULTI) {
clnum = rex.reg_mmatch->startpos[no].lnum;
if (clnum < 0 || rex.reg_mmatch->endpos[no].lnum < 0) {
s = NULL;
} else {
s = reg_getline(clnum) + rex.reg_mmatch->startpos[no].col;
if (rex.reg_mmatch->endpos[no].lnum == clnum) {
len = rex.reg_mmatch->endpos[no].col
- rex.reg_mmatch->startpos[no].col;
} else {
len = (int)strlen(s);
}
}
} else {
s = rex.reg_match->startp[no];
if (rex.reg_match->endp[no] == NULL) {
s = NULL;
} else {
len = (int)(rex.reg_match->endp[no] - s);
}
}
if (s != NULL) {
while (true) {
if (len == 0) {
if (REG_MULTI) {
if (rex.reg_mmatch->endpos[no].lnum == clnum) {
break;
}
if (copy) {
if (dst + 1 > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
*dst = CAR;
}
dst++;
s = reg_getline(++clnum);
if (rex.reg_mmatch->endpos[no].lnum == clnum) {
len = rex.reg_mmatch->endpos[no].col;
} else {
len = (int)strlen(s);
}
} else {
break;
}
} else if (*s == NUL) { // we hit NUL.
if (copy) {
iemsg(_(e_re_damg));
}
goto exit;
} else {
if ((flags & REGSUB_BACKSLASH) && (*s == CAR || *s == '\\')) {
// Insert a backslash in front of a CR, otherwise
// it will be replaced by a line break.
// Number of backslashes will be halved later,
// double them here.
if (copy) {
if (dst + 2 > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
dst[0] = '\\';
dst[1] = *s;
}
dst += 2;
} else {
c = utf_ptr2char(s);
if (func_one != (fptr_T)NULL) {
func_one(&cc, c);
func_one = NULL;
} else if (func_all != (fptr_T)NULL) {
func_all(&cc, c);
} else { // just copy
cc = c;
}
{
int l;
int charlen;
// Copy composing characters separately, one
// at a time.
l = utf_ptr2len(s) - 1;
s += l;
len -= l;
charlen = utf_char2len(cc);
if (copy) {
if (dst + charlen > dest + destlen) {
iemsg("vim_regsub_both(): not enough space");
return 0;
}
utf_char2bytes(cc, dst);
}
dst += charlen - 1;
}
dst++;
}
s++;
len--;
}
}
}
no = -1;
}
}
}
if (copy) {
*dst = NUL;
}
exit:
return (int)((dst - dest) + 1);
}
/// Call reg_getline() with the line numbers from the submatch. If a
/// substitute() was used the reg_maxline and other values have been
/// overwritten.
static char *reg_getline_submatch(linenr_T lnum)
{
char *s;
linenr_T save_first = rex.reg_firstlnum;
linenr_T save_max = rex.reg_maxline;
rex.reg_firstlnum = rsm.sm_firstlnum;
rex.reg_maxline = rsm.sm_maxline;
s = reg_getline(lnum);
rex.reg_firstlnum = save_first;
rex.reg_maxline = save_max;
return s;
}
/// Used for the submatch() function: get the string from the n'th submatch in
/// allocated memory.
///
/// @return NULL when not in a ":s" command and for a non-existing submatch.
char *reg_submatch(int no)
{
char *retval = NULL;
char *s;
int round;
linenr_T lnum;
if (!can_f_submatch || no < 0) {
return NULL;
}
if (rsm.sm_match == NULL) {
ssize_t len;
// First round: compute the length and allocate memory.
// Second round: copy the text.
for (round = 1; round <= 2; round++) {
lnum = rsm.sm_mmatch->startpos[no].lnum;
if (lnum < 0 || rsm.sm_mmatch->endpos[no].lnum < 0) {
return NULL;
}
s = reg_getline_submatch(lnum);
if (s == NULL) { // anti-crash check, cannot happen?
break;
}
s += rsm.sm_mmatch->startpos[no].col;
if (rsm.sm_mmatch->endpos[no].lnum == lnum) {
// Within one line: take form start to end col.
len = rsm.sm_mmatch->endpos[no].col - rsm.sm_mmatch->startpos[no].col;
if (round == 2) {
xstrlcpy(retval, s, (size_t)len + 1);
}
len++;
} else {
// Multiple lines: take start line from start col, middle
// lines completely and end line up to end col.
len = (ssize_t)strlen(s);
if (round == 2) {
STRCPY(retval, s);
retval[len] = '\n';
}
len++;
lnum++;
while (lnum < rsm.sm_mmatch->endpos[no].lnum) {
s = reg_getline_submatch(lnum++);
if (round == 2) {
STRCPY(retval + len, s);
}
len += (ssize_t)strlen(s);
if (round == 2) {
retval[len] = '\n';
}
len++;
}
if (round == 2) {
strncpy(retval + len, // NOLINT(runtime/printf)
reg_getline_submatch(lnum),
(size_t)rsm.sm_mmatch->endpos[no].col);
}
len += rsm.sm_mmatch->endpos[no].col;
if (round == 2) {
retval[len] = NUL;
}
len++;
}
if (retval == NULL) {
retval = xmalloc((size_t)len);
}
}
} else {
s = rsm.sm_match->startp[no];
if (s == NULL || rsm.sm_match->endp[no] == NULL) {
retval = NULL;
} else {
retval = xstrnsave(s, (size_t)(rsm.sm_match->endp[no] - s));
}
}
return retval;
}
// Used for the submatch() function with the optional non-zero argument: get
// the list of strings from the n'th submatch in allocated memory with NULs
// represented in NLs.
// Returns a list of allocated strings. Returns NULL when not in a ":s"
// command, for a non-existing submatch and for any error.
list_T *reg_submatch_list(int no)
{
if (!can_f_submatch || no < 0) {
return NULL;
}
linenr_T slnum;
linenr_T elnum;
list_T *list;
const char *s;
if (rsm.sm_match == NULL) {
slnum = rsm.sm_mmatch->startpos[no].lnum;
elnum = rsm.sm_mmatch->endpos[no].lnum;
if (slnum < 0 || elnum < 0) {
return NULL;
}
colnr_T scol = rsm.sm_mmatch->startpos[no].col;
colnr_T ecol = rsm.sm_mmatch->endpos[no].col;
list = tv_list_alloc(elnum - slnum + 1);
s = reg_getline_submatch(slnum) + scol;
if (slnum == elnum) {
tv_list_append_string(list, s, ecol - scol);
} else {
tv_list_append_string(list, s, -1);
for (int i = 1; i < elnum - slnum; i++) {
s = reg_getline_submatch(slnum + i);
tv_list_append_string(list, s, -1);
}
s = reg_getline_submatch(elnum);
tv_list_append_string(list, s, ecol);
}
} else {
s = rsm.sm_match->startp[no];
if (s == NULL || rsm.sm_match->endp[no] == NULL) {
return NULL;
}
list = tv_list_alloc(1);
tv_list_append_string(list, s, rsm.sm_match->endp[no] - s);
}
tv_list_ref(list);
return list;
}
/// Initialize the values used for matching against multiple lines
///
/// @param win window in which to search or NULL
/// @param buf buffer in which to search
/// @param lnum nr of line to start looking for match
static void init_regexec_multi(regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum)
{
rex.reg_match = NULL;
rex.reg_mmatch = rmp;
rex.reg_buf = buf;
rex.reg_win = win;
rex.reg_firstlnum = lnum;
rex.reg_maxline = rex.reg_buf->b_ml.ml_line_count - lnum;
rex.reg_line_lbr = false;
rex.reg_ic = rmp->rmm_ic;
rex.reg_icombine = false;
rex.reg_nobreak = rmp->regprog->re_flags & RE_NOBREAK;
rex.reg_maxcol = rmp->rmm_maxcol;
}
// regexp_bt.c {{{1
// Backtracking regular expression implementation.
//
// NOTICE:
//
// This is NOT the original regular expression code as written by Henry
// Spencer. This code has been modified specifically for use with the VIM
// editor, and should not be used separately from Vim. If you want a good
// regular expression library, get the original code. The copyright notice
// that follows is from the original.
//
// END NOTICE
//
// Copyright (c) 1986 by University of Toronto.
// Written by Henry Spencer. Not derived from licensed software.
//
// Permission is granted to anyone to use this software for any
// purpose on any computer system, and to redistribute it freely,
// subject to the following restrictions:
//
// 1. The author is not responsible for the consequences of use of
// this software, no matter how awful, even if they arise
// from defects in it.
//
// 2. The origin of this software must not be misrepresented, either
// by explicit claim or by omission.
//
// 3. Altered versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// Beware that some of this code is subtly aware of the way operator
// precedence is structured in regular expressions. Serious changes in
// regular-expression syntax might require a total rethink.
//
// Changes have been made by Tony Andrews, Olaf 'Rhialto' Seibert, Robert
// Webb, Ciaran McCreesh and Bram Moolenaar.
// Named character class support added by Walter Briscoe (1998 Jul 01)
// The "internal use only" fields in regexp_defs.h are present to pass info from
// compile to execute that permits the execute phase to run lots faster on
// simple cases. They are:
//
// regstart char that must begin a match; NUL if none obvious; Can be a
// multi-byte character.
// reganch is the match anchored (at beginning-of-line only)?
// regmust string (pointer into program) that match must include, or NULL
// regmlen length of regmust string
// regflags RF_ values or'ed together
//
// Regstart and reganch permit very fast decisions on suitable starting points
// for a match, cutting down the work a lot. Regmust permits fast rejection
// of lines that cannot possibly match. The regmust tests are costly enough
// that vim_regcomp() supplies a regmust only if the r.e. contains something
// potentially expensive (at present, the only such thing detected is * or +
// at the start of the r.e., which can involve a lot of backup). Regmlen is
// supplied because the test in vim_regexec() needs it and vim_regcomp() is
// computing it anyway.
// Structure for regexp "program". This is essentially a linear encoding
// of a nondeterministic finite-state machine (aka syntax charts or
// "railroad normal form" in parsing technology). Each node is an opcode
// plus a "next" pointer, possibly plus an operand. "Next" pointers of
// all nodes except BRANCH and BRACES_COMPLEX implement concatenation; a "next"
// pointer with a BRANCH on both ends of it is connecting two alternatives.
// (Here we have one of the subtle syntax dependencies: an individual BRANCH
// (as opposed to a collection of them) is never concatenated with anything
// because of operator precedence). The "next" pointer of a BRACES_COMPLEX
// node points to the node after the stuff to be repeated.
// The operand of some types of node is a literal string; for others, it is a
// node leading into a sub-FSM. In particular, the operand of a BRANCH node
// is the first node of the branch.
// (NB this is *not* a tree structure: the tail of the branch connects to the
// thing following the set of BRANCHes.)
//
// pattern is coded like:
//
// +-----------------+
// | V
// <aa>\|<bb> BRANCH <aa> BRANCH <bb> --> END
// | ^ | ^
// +------+ +----------+
//
//
// +------------------+
// V |
// <aa>* BRANCH BRANCH <aa> --> BACK BRANCH --> NOTHING --> END
// | | ^ ^
// | +---------------+ |
// +---------------------------------------------+
//
//
// +----------------------+
// V |
// <aa>\+ BRANCH <aa> --> BRANCH --> BACK BRANCH --> NOTHING --> END
// | | ^ ^
// | +-----------+ |
// +--------------------------------------------------+
//
//
// +-------------------------+
// V |
// <aa>\{} BRANCH BRACE_LIMITS --> BRACE_COMPLEX <aa> --> BACK END
// | | ^
// | +----------------+
// +-----------------------------------------------+
//
//
// <aa>\@!<bb> BRANCH NOMATCH <aa> --> END <bb> --> END
// | | ^ ^
// | +----------------+ |
// +--------------------------------+
//
// +---------+
// | V
// \z[abc] BRANCH BRANCH a BRANCH b BRANCH c BRANCH NOTHING --> END
// | | | | ^ ^
// | | | +-----+ |
// | | +----------------+ |
// | +---------------------------+ |
// +------------------------------------------------------+
//
// They all start with a BRANCH for "\|" alternatives, even when there is only
// one alternative.
// The opcodes are:
// definition number opnd? meaning
#define END 0 // End of program or NOMATCH operand.
#define BOL 1 // Match "" at beginning of line.
#define EOL 2 // Match "" at end of line.
#define BRANCH 3 // node Match this alternative, or the
// next...
#define BACK 4 // Match "", "next" ptr points backward.
#define EXACTLY 5 // str Match this string.
#define NOTHING 6 // Match empty string.
#define STAR 7 // node Match this (simple) thing 0 or more
// times.
#define PLUS 8 // node Match this (simple) thing 1 or more
// times.
#define MATCH 9 // node match the operand zero-width
#define NOMATCH 10 // node check for no match with operand
#define BEHIND 11 // node look behind for a match with operand
#define NOBEHIND 12 // node look behind for no match with operand
#define SUBPAT 13 // node match the operand here
#define BRACE_SIMPLE 14 // node Match this (simple) thing between m and
// n times (\{m,n\}).
#define BOW 15 // Match "" after [^a-zA-Z0-9_]
#define EOW 16 // Match "" at [^a-zA-Z0-9_]
#define BRACE_LIMITS 17 // nr nr define the min & max for BRACE_SIMPLE
// and BRACE_COMPLEX.
#define NEWL 18 // Match line-break
#define BHPOS 19 // End position for BEHIND or NOBEHIND
// character classes: 20-48 normal, 50-78 include a line-break
#define ADD_NL 30
#define FIRST_NL ANY + ADD_NL
#define ANY 20 // Match any one character.
#define ANYOF 21 // str Match any character in this string.
#define ANYBUT 22 // str Match any character not in this
// string.
#define IDENT 23 // Match identifier char
#define SIDENT 24 // Match identifier char but no digit
#define KWORD 25 // Match keyword char
#define SKWORD 26 // Match word char but no digit
#define FNAME 27 // Match file name char
#define SFNAME 28 // Match file name char but no digit
#define PRINT 29 // Match printable char
#define SPRINT 30 // Match printable char but no digit
#define WHITE 31 // Match whitespace char
#define NWHITE 32 // Match non-whitespace char
#define DIGIT 33 // Match digit char
#define NDIGIT 34 // Match non-digit char
#define HEX 35 // Match hex char
#define NHEX 36 // Match non-hex char
#define OCTAL 37 // Match octal char
#define NOCTAL 38 // Match non-octal char
#define WORD 39 // Match word char
#define NWORD 40 // Match non-word char
#define HEAD 41 // Match head char
#define NHEAD 42 // Match non-head char
#define ALPHA 43 // Match alpha char
#define NALPHA 44 // Match non-alpha char
#define LOWER 45 // Match lowercase char
#define NLOWER 46 // Match non-lowercase char
#define UPPER 47 // Match uppercase char
#define NUPPER 48 // Match non-uppercase char
#define LAST_NL NUPPER + ADD_NL
#define WITH_NL(op) ((op) >= FIRST_NL && (op) <= LAST_NL)
#define MOPEN 80 // -89 Mark this point in input as start of
// \( … \) subexpr. MOPEN + 0 marks start of
// match.
#define MCLOSE 90 // -99 Analogous to MOPEN. MCLOSE + 0 marks
// end of match.
#define BACKREF 100 // -109 node Match same string again \1-\9.
#define ZOPEN 110 // -119 Mark this point in input as start of
// \z( … \) subexpr.
#define ZCLOSE 120 // -129 Analogous to ZOPEN.
#define ZREF 130 // -139 node Match external submatch \z1-\z9
#define BRACE_COMPLEX 140 // -149 node Match nodes between m & n times
#define NOPEN 150 // Mark this point in input as start of
// \%( subexpr.
#define NCLOSE 151 // Analogous to NOPEN.
#define MULTIBYTECODE 200 // mbc Match one multi-byte character
#define RE_BOF 201 // Match "" at beginning of file.
#define RE_EOF 202 // Match "" at end of file.
#define CURSOR 203 // Match location of cursor.
#define RE_LNUM 204 // nr cmp Match line number
#define RE_COL 205 // nr cmp Match column number
#define RE_VCOL 206 // nr cmp Match virtual column number
#define RE_MARK 207 // mark cmp Match mark position
#define RE_VISUAL 208 // Match Visual area
#define RE_COMPOSING 209 // any composing characters
// Flags to be passed up and down.
#define HASWIDTH 0x1 // Known never to match null string.
#define SIMPLE 0x2 // Simple enough to be STAR/PLUS operand.
#define SPSTART 0x4 // Starts with * or +.
#define HASNL 0x8 // Contains some \n.
#define HASLOOKBH 0x10 // Contains "\@<=" or "\@<!".
#define WORST 0 // Worst case.
static int prevchr_len; ///< byte length of previous char
static int num_complex_braces; ///< Complex \{...} count
static uint8_t *regcode; ///< Code-emit pointer, or JUST_CALC_SIZE
static int64_t regsize; ///< Code size.
static int reg_toolong; ///< true when offset out of range
static uint8_t had_endbrace[NSUBEXP]; ///< flags, true if end of () found
static int64_t brace_min[10]; ///< Minimums for complex brace repeats
static int64_t brace_max[10]; ///< Maximums for complex brace repeats
static int brace_count[10]; ///< Current counts for complex brace repeats
static int one_exactly = false; ///< only do one char for EXACTLY
// When making changes to classchars also change nfa_classcodes.
static uint8_t *classchars = (uint8_t *)".iIkKfFpPsSdDxXoOwWhHaAlLuU";
static int classcodes[] = {
ANY, IDENT, SIDENT, KWORD, SKWORD,
FNAME, SFNAME, PRINT, SPRINT,
WHITE, NWHITE, DIGIT, NDIGIT,
HEX, NHEX, OCTAL, NOCTAL,
WORD, NWORD, HEAD, NHEAD,
ALPHA, NALPHA, LOWER, NLOWER,
UPPER, NUPPER
};
// When regcode is set to this value, code is not emitted and size is computed
// instead.
#define JUST_CALC_SIZE ((uint8_t *)-1)
// used for STAR, PLUS and BRACE_SIMPLE matching
typedef struct regstar_S {
int nextb; // next byte
int nextb_ic; // next byte reverse case
int64_t count;
int64_t minval;
int64_t maxval;
} regstar_T;
// used to store input position when a BACK was encountered, so that we now if
// we made any progress since the last time.
typedef struct backpos_S {
uint8_t *bp_scan; // "scan" where BACK was encountered
regsave_T bp_pos; // last input position
} backpos_T;
// "regstack" and "backpos" are used by regmatch(). They are kept over calls
// to avoid invoking malloc() and free() often.
// "regstack" is a stack with regitem_T items, sometimes preceded by regstar_T
// or regbehind_T.
// "backpos_T" is a table with backpos_T for BACK
static garray_T regstack = GA_EMPTY_INIT_VALUE;
static garray_T backpos = GA_EMPTY_INIT_VALUE;
static regsave_T behind_pos;
// Both for regstack and backpos tables we use the following strategy of
// allocation (to reduce malloc/free calls):
// - Initial size is fairly small.
// - When needed, the tables are grown bigger (8 times at first, double after
// that).
// - After executing the match we free the memory only if the array has grown.
// Thus the memory is kept allocated when it's at the initial size.
// This makes it fast while not keeping a lot of memory allocated.
// A three times speed increase was observed when using many simple patterns.
#define REGSTACK_INITIAL 2048
#define BACKPOS_INITIAL 64
// Opcode notes:
//
// BRANCH The set of branches constituting a single choice are hooked
// together with their "next" pointers, since precedence prevents
// anything being concatenated to any individual branch. The
// "next" pointer of the last BRANCH in a choice points to the
// thing following the whole choice. This is also where the
// final "next" pointer of each individual branch points; each
// branch starts with the operand node of a BRANCH node.
//
// BACK Normal "next" pointers all implicitly point forward; BACK
// exists to make loop structures possible.
//
// STAR,PLUS '=', and complex '*' and '+', are implemented as circular
// BRANCH structures using BACK. Simple cases (one character
// per match) are implemented with STAR and PLUS for speed
// and to minimize recursive plunges.
//
// BRACE_LIMITS This is always followed by a BRACE_SIMPLE or BRACE_COMPLEX
// node, and defines the min and max limits to be used for that
// node.
//
// MOPEN,MCLOSE ...are numbered at compile time.
// ZOPEN,ZCLOSE ...ditto
///
//
//
// A node is one char of opcode followed by two chars of "next" pointer.
// "Next" pointers are stored as two 8-bit bytes, high order first. The
// value is a positive offset from the opcode of the node containing it.
// An operand, if any, simply follows the node. (Note that much of the
// code generation knows about this implicit relationship.)
//
// Using two bytes for the "next" pointer is vast overkill for most things,
// but allows patterns to get big without disasters.
#define OP(p) ((int)(*(p)))
#define NEXT(p) (((*((p) + 1) & 0377) << 8) + (*((p) + 2) & 0377))
#define OPERAND(p) ((p) + 3)
// Obtain an operand that was stored as four bytes, MSB first.
#define OPERAND_MIN(p) (((int64_t)(p)[3] << 24) + ((int64_t)(p)[4] << 16) \
+ ((int64_t)(p)[5] << 8) + (int64_t)(p)[6])
// Obtain a second operand stored as four bytes.
#define OPERAND_MAX(p) OPERAND_MIN((p) + 4)
// Obtain a second single-byte operand stored after a four bytes operand.
#define OPERAND_CMP(p) (p)[7]
static uint8_t *reg(int paren, int *flagp);
#ifdef BT_REGEXP_DUMP
static void regdump(uint8_t *, bt_regprog_T *);
#endif
#ifdef REGEXP_DEBUG
static uint8_t *regprop(uint8_t *);
static int regnarrate = 0;
#endif
// Setup to parse the regexp. Used once to get the length and once to do it.
static void regcomp_start(uint8_t *expr, int re_flags) // see vim_regcomp()
{
initchr((char *)expr);
if (re_flags & RE_MAGIC) {
reg_magic = MAGIC_ON;
} else {
reg_magic = MAGIC_OFF;
}
reg_string = (re_flags & RE_STRING);
reg_strict = (re_flags & RE_STRICT);
get_cpo_flags();
num_complex_braces = 0;
regnpar = 1;
CLEAR_FIELD(had_endbrace);
regnzpar = 1;
re_has_z = 0;
regsize = 0L;
reg_toolong = false;
regflags = 0;
had_eol = false;
}
// Return true if MULTIBYTECODE should be used instead of EXACTLY for
// character "c".
static bool use_multibytecode(int c)
{
return utf_char2len(c) > 1
&& (re_multi_type(peekchr()) != NOT_MULTI
|| utf_iscomposing(c));
}
// Emit (if appropriate) a byte of code
static void regc(int b)
{
if (regcode == JUST_CALC_SIZE) {
regsize++;
} else {
*regcode++ = (uint8_t)b;
}
}
// Emit (if appropriate) a multi-byte character of code
static void regmbc(int c)
{
if (regcode == JUST_CALC_SIZE) {
regsize += utf_char2len(c);
} else {
regcode += utf_char2bytes(c, (char *)regcode);
}
}
// Produce the bytes for equivalence class "c".
// Currently only handles latin1, latin9 and utf-8.
// NOTE: When changing this function, also change nfa_emit_equi_class()
static void reg_equi_class(int c)
{
{
switch (c) {
// Do not use '\300' style, it results in a negative number.
case 'A':
case 0xc0:
case 0xc1:
case 0xc2:
case 0xc3:
case 0xc4:
case 0xc5:
case 0x100:
case 0x102:
case 0x104:
case 0x1cd:
case 0x1de:
case 0x1e0:
case 0x1fa:
case 0x202:
case 0x226:
case 0x23a:
case 0x1e00:
case 0x1ea0:
case 0x1ea2:
case 0x1ea4:
case 0x1ea6:
case 0x1ea8:
case 0x1eaa:
case 0x1eac:
case 0x1eae:
case 0x1eb0:
case 0x1eb2:
case 0x1eb4:
case 0x1eb6:
regmbc('A'); regmbc(0xc0); regmbc(0xc1); regmbc(0xc2);
regmbc(0xc3); regmbc(0xc4); regmbc(0xc5);
regmbc(0x100); regmbc(0x102); regmbc(0x104);
regmbc(0x1cd); regmbc(0x1de); regmbc(0x1e0);
regmbc(0x1fa); regmbc(0x202); regmbc(0x226);
regmbc(0x23a); regmbc(0x1e00); regmbc(0x1ea0);
regmbc(0x1ea2); regmbc(0x1ea4); regmbc(0x1ea6);
regmbc(0x1ea8); regmbc(0x1eaa); regmbc(0x1eac);
regmbc(0x1eae); regmbc(0x1eb0); regmbc(0x1eb2);
regmbc(0x1eb4); regmbc(0x1eb6);
return;
case 'B':
case 0x181:
case 0x243:
case 0x1e02:
case 0x1e04:
case 0x1e06:
regmbc('B');
regmbc(0x181); regmbc(0x243); regmbc(0x1e02);
regmbc(0x1e04); regmbc(0x1e06);
return;
case 'C':
case 0xc7:
case 0x106:
case 0x108:
case 0x10a:
case 0x10c:
case 0x187:
case 0x23b:
case 0x1e08:
case 0xa792:
regmbc('C'); regmbc(0xc7);
regmbc(0x106); regmbc(0x108); regmbc(0x10a);
regmbc(0x10c); regmbc(0x187); regmbc(0x23b);
regmbc(0x1e08); regmbc(0xa792);
return;
case 'D':
case 0x10e:
case 0x110:
case 0x18a:
case 0x1e0a:
case 0x1e0c:
case 0x1e0e:
case 0x1e10:
case 0x1e12:
regmbc('D'); regmbc(0x10e); regmbc(0x110);
regmbc(0x18a); regmbc(0x1e0a); regmbc(0x1e0c);
regmbc(0x1e0e); regmbc(0x1e10); regmbc(0x1e12);
return;
case 'E':
case 0xc8:
case 0xc9:
case 0xca:
case 0xcb:
case 0x112:
case 0x114:
case 0x116:
case 0x118:
case 0x11a:
case 0x204:
case 0x206:
case 0x228:
case 0x246:
case 0x1e14:
case 0x1e16:
case 0x1e18:
case 0x1e1a:
case 0x1e1c:
case 0x1eb8:
case 0x1eba:
case 0x1ebc:
case 0x1ebe:
case 0x1ec0:
case 0x1ec2:
case 0x1ec4:
case 0x1ec6:
regmbc('E'); regmbc(0xc8); regmbc(0xc9);
regmbc(0xca); regmbc(0xcb); regmbc(0x112);
regmbc(0x114); regmbc(0x116); regmbc(0x118);
regmbc(0x11a); regmbc(0x204); regmbc(0x206);
regmbc(0x228); regmbc(0x246); regmbc(0x1e14);
regmbc(0x1e16); regmbc(0x1e18); regmbc(0x1e1a);
regmbc(0x1e1c); regmbc(0x1eb8); regmbc(0x1eba);
regmbc(0x1ebc); regmbc(0x1ebe); regmbc(0x1ec0);
regmbc(0x1ec2); regmbc(0x1ec4); regmbc(0x1ec6);
return;
case 'F':
case 0x191:
case 0x1e1e:
case 0xa798:
regmbc('F'); regmbc(0x191); regmbc(0x1e1e);
regmbc(0xa798);
return;
case 'G':
case 0x11c:
case 0x11e:
case 0x120:
case 0x122:
case 0x193:
case 0x1e4:
case 0x1e6:
case 0x1f4:
case 0x1e20:
case 0xa7a0:
regmbc('G'); regmbc(0x11c); regmbc(0x11e);
regmbc(0x120); regmbc(0x122); regmbc(0x193);
regmbc(0x1e4); regmbc(0x1e6); regmbc(0x1f4);
regmbc(0x1e20); regmbc(0xa7a0);
return;
case 'H':
case 0x124:
case 0x126:
case 0x21e:
case 0x1e22:
case 0x1e24:
case 0x1e26:
case 0x1e28:
case 0x1e2a:
case 0x2c67:
regmbc('H'); regmbc(0x124); regmbc(0x126);
regmbc(0x21e); regmbc(0x1e22); regmbc(0x1e24);
regmbc(0x1e26); regmbc(0x1e28); regmbc(0x1e2a);
regmbc(0x2c67);
return;
case 'I':
case 0xcc:
case 0xcd:
case 0xce:
case 0xcf:
case 0x128:
case 0x12a:
case 0x12c:
case 0x12e:
case 0x130:
case 0x197:
case 0x1cf:
case 0x208:
case 0x20a:
case 0x1e2c:
case 0x1e2e:
case 0x1ec8:
case 0x1eca:
regmbc('I'); regmbc(0xcc); regmbc(0xcd);
regmbc(0xce); regmbc(0xcf); regmbc(0x128);
regmbc(0x12a); regmbc(0x12c); regmbc(0x12e);
regmbc(0x130); regmbc(0x197); regmbc(0x1cf);
regmbc(0x208); regmbc(0x20a); regmbc(0x1e2c);
regmbc(0x1e2e); regmbc(0x1ec8); regmbc(0x1eca);
return;
case 'J':
case 0x134:
case 0x248:
regmbc('J'); regmbc(0x134); regmbc(0x248);
return;
case 'K':
case 0x136:
case 0x198:
case 0x1e8:
case 0x1e30:
case 0x1e32:
case 0x1e34:
case 0x2c69:
case 0xa740:
regmbc('K'); regmbc(0x136); regmbc(0x198);
regmbc(0x1e8); regmbc(0x1e30); regmbc(0x1e32);
regmbc(0x1e34); regmbc(0x2c69); regmbc(0xa740);
return;
case 'L':
case 0x139:
case 0x13b:
case 0x13d:
case 0x13f:
case 0x141:
case 0x23d:
case 0x1e36:
case 0x1e38:
case 0x1e3a:
case 0x1e3c:
case 0x2c60:
regmbc('L'); regmbc(0x139); regmbc(0x13b);
regmbc(0x13d); regmbc(0x13f); regmbc(0x141);
regmbc(0x23d); regmbc(0x1e36); regmbc(0x1e38);
regmbc(0x1e3a); regmbc(0x1e3c); regmbc(0x2c60);
return;
case 'M':
case 0x1e3e:
case 0x1e40:
case 0x1e42:
regmbc('M'); regmbc(0x1e3e); regmbc(0x1e40);
regmbc(0x1e42);
return;
case 'N':
case 0xd1:
case 0x143:
case 0x145:
case 0x147:
case 0x1f8:
case 0x1e44:
case 0x1e46:
case 0x1e48:
case 0x1e4a:
case 0xa7a4:
regmbc('N'); regmbc(0xd1);
regmbc(0x143); regmbc(0x145); regmbc(0x147);
regmbc(0x1f8); regmbc(0x1e44); regmbc(0x1e46);
regmbc(0x1e48); regmbc(0x1e4a); regmbc(0xa7a4);
return;
case 'O':
case 0xd2:
case 0xd3:
case 0xd4:
case 0xd5:
case 0xd6:
case 0xd8:
case 0x14c:
case 0x14e:
case 0x150:
case 0x19f:
case 0x1a0:
case 0x1d1:
case 0x1ea:
case 0x1ec:
case 0x1fe:
case 0x20c:
case 0x20e:
case 0x22a:
case 0x22c:
case 0x22e:
case 0x230:
case 0x1e4c:
case 0x1e4e:
case 0x1e50:
case 0x1e52:
case 0x1ecc:
case 0x1ece:
case 0x1ed0:
case 0x1ed2:
case 0x1ed4:
case 0x1ed6:
case 0x1ed8:
case 0x1eda:
case 0x1edc:
case 0x1ede:
case 0x1ee0:
case 0x1ee2:
regmbc('O'); regmbc(0xd2); regmbc(0xd3); regmbc(0xd4);
regmbc(0xd5); regmbc(0xd6); regmbc(0xd8);
regmbc(0x14c); regmbc(0x14e); regmbc(0x150);
regmbc(0x19f); regmbc(0x1a0); regmbc(0x1d1);
regmbc(0x1ea); regmbc(0x1ec); regmbc(0x1fe);
regmbc(0x20c); regmbc(0x20e); regmbc(0x22a);
regmbc(0x22c); regmbc(0x22e); regmbc(0x230);
regmbc(0x1e4c); regmbc(0x1e4e); regmbc(0x1e50);
regmbc(0x1e52); regmbc(0x1ecc); regmbc(0x1ece);
regmbc(0x1ed0); regmbc(0x1ed2); regmbc(0x1ed4);
regmbc(0x1ed6); regmbc(0x1ed8); regmbc(0x1eda);
regmbc(0x1edc); regmbc(0x1ede); regmbc(0x1ee0);
regmbc(0x1ee2);
return;
case 'P':
case 0x1a4:
case 0x1e54:
case 0x1e56:
case 0x2c63:
regmbc('P'); regmbc(0x1a4); regmbc(0x1e54);
regmbc(0x1e56); regmbc(0x2c63);
return;
case 'Q':
case 0x24a:
regmbc('Q'); regmbc(0x24a);
return;
case 'R':
case 0x154:
case 0x156:
case 0x158:
case 0x210:
case 0x212:
case 0x24c:
case 0x1e58:
case 0x1e5a:
case 0x1e5c:
case 0x1e5e:
case 0x2c64:
case 0xa7a6:
regmbc('R'); regmbc(0x154); regmbc(0x156);
regmbc(0x210); regmbc(0x212); regmbc(0x158);
regmbc(0x24c); regmbc(0x1e58); regmbc(0x1e5a);
regmbc(0x1e5c); regmbc(0x1e5e); regmbc(0x2c64);
regmbc(0xa7a6);
return;
case 'S':
case 0x15a:
case 0x15c:
case 0x15e:
case 0x160:
case 0x218:
case 0x1e60:
case 0x1e62:
case 0x1e64:
case 0x1e66:
case 0x1e68:
case 0x2c7e:
case 0xa7a8:
regmbc('S'); regmbc(0x15a); regmbc(0x15c);
regmbc(0x15e); regmbc(0x160); regmbc(0x218);
regmbc(0x1e60); regmbc(0x1e62); regmbc(0x1e64);
regmbc(0x1e66); regmbc(0x1e68); regmbc(0x2c7e);
regmbc(0xa7a8);
return;
case 'T':
case 0x162:
case 0x164:
case 0x166:
case 0x1ac:
case 0x1ae:
case 0x21a:
case 0x23e:
case 0x1e6a:
case 0x1e6c:
case 0x1e6e:
case 0x1e70:
regmbc('T'); regmbc(0x162); regmbc(0x164);
regmbc(0x166); regmbc(0x1ac); regmbc(0x23e);
regmbc(0x1ae); regmbc(0x21a); regmbc(0x1e6a);
regmbc(0x1e6c); regmbc(0x1e6e); regmbc(0x1e70);
return;
case 'U':
case 0xd9:
case 0xda:
case 0xdb:
case 0xdc:
case 0x168:
case 0x16a:
case 0x16c:
case 0x16e:
case 0x170:
case 0x172:
case 0x1af:
case 0x1d3:
case 0x1d5:
case 0x1d7:
case 0x1d9:
case 0x1db:
case 0x214:
case 0x216:
case 0x244:
case 0x1e72:
case 0x1e74:
case 0x1e76:
case 0x1e78:
case 0x1e7a:
case 0x1ee4:
case 0x1ee6:
case 0x1ee8:
case 0x1eea:
case 0x1eec:
case 0x1eee:
case 0x1ef0:
regmbc('U'); regmbc(0xd9); regmbc(0xda);
regmbc(0xdb); regmbc(0xdc); regmbc(0x168);
regmbc(0x16a); regmbc(0x16c); regmbc(0x16e);
regmbc(0x170); regmbc(0x172); regmbc(0x1af);
regmbc(0x1d3); regmbc(0x1d5); regmbc(0x1d7);
regmbc(0x1d9); regmbc(0x1db); regmbc(0x214);
regmbc(0x216); regmbc(0x244); regmbc(0x1e72);
regmbc(0x1e74); regmbc(0x1e76); regmbc(0x1e78);
regmbc(0x1e7a); regmbc(0x1ee4); regmbc(0x1ee6);
regmbc(0x1ee8); regmbc(0x1eea); regmbc(0x1eec);
regmbc(0x1eee); regmbc(0x1ef0);
return;
case 'V':
case 0x1b2:
case 0x1e7c:
case 0x1e7e:
regmbc('V'); regmbc(0x1b2); regmbc(0x1e7c);
regmbc(0x1e7e);
return;
case 'W':
case 0x174:
case 0x1e80:
case 0x1e82:
case 0x1e84:
case 0x1e86:
case 0x1e88:
regmbc('W'); regmbc(0x174); regmbc(0x1e80);
regmbc(0x1e82); regmbc(0x1e84); regmbc(0x1e86);
regmbc(0x1e88);
return;
case 'X':
case 0x1e8a:
case 0x1e8c:
regmbc('X'); regmbc(0x1e8a); regmbc(0x1e8c);
return;
case 'Y':
case 0xdd:
case 0x176:
case 0x178:
case 0x1b3:
case 0x232:
case 0x24e:
case 0x1e8e:
case 0x1ef2:
case 0x1ef6:
case 0x1ef4:
case 0x1ef8:
regmbc('Y'); regmbc(0xdd); regmbc(0x176);
regmbc(0x178); regmbc(0x1b3); regmbc(0x232);
regmbc(0x24e); regmbc(0x1e8e); regmbc(0x1ef2);
regmbc(0x1ef4); regmbc(0x1ef6); regmbc(0x1ef8);
return;
case 'Z':
case 0x179:
case 0x17b:
case 0x17d:
case 0x1b5:
case 0x1e90:
case 0x1e92:
case 0x1e94:
case 0x2c6b:
regmbc('Z'); regmbc(0x179); regmbc(0x17b);
regmbc(0x17d); regmbc(0x1b5); regmbc(0x1e90);
regmbc(0x1e92); regmbc(0x1e94); regmbc(0x2c6b);
return;
case 'a':
case 0xe0:
case 0xe1:
case 0xe2:
case 0xe3:
case 0xe4:
case 0xe5:
case 0x101:
case 0x103:
case 0x105:
case 0x1ce:
case 0x1df:
case 0x1e1:
case 0x1fb:
case 0x201:
case 0x203:
case 0x227:
case 0x1d8f:
case 0x1e01:
case 0x1e9a:
case 0x1ea1:
case 0x1ea3:
case 0x1ea5:
case 0x1ea7:
case 0x1ea9:
case 0x1eab:
case 0x1ead:
case 0x1eaf:
case 0x1eb1:
case 0x1eb3:
case 0x1eb5:
case 0x1eb7:
case 0x2c65:
regmbc('a'); regmbc(0xe0); regmbc(0xe1);
regmbc(0xe2); regmbc(0xe3); regmbc(0xe4);
regmbc(0xe5); regmbc(0x101); regmbc(0x103);
regmbc(0x105); regmbc(0x1ce); regmbc(0x1df);
regmbc(0x1e1); regmbc(0x1fb); regmbc(0x201);
regmbc(0x203); regmbc(0x227); regmbc(0x1d8f);
regmbc(0x1e01); regmbc(0x1e9a); regmbc(0x1ea1);
regmbc(0x1ea3); regmbc(0x1ea5); regmbc(0x1ea7);
regmbc(0x1ea9); regmbc(0x1eab); regmbc(0x1ead);
regmbc(0x1eaf); regmbc(0x1eb1); regmbc(0x1eb3);
regmbc(0x1eb5); regmbc(0x1eb7); regmbc(0x2c65);
return;
case 'b':
case 0x180:
case 0x253:
case 0x1d6c:
case 0x1d80:
case 0x1e03:
case 0x1e05:
case 0x1e07:
regmbc('b');
regmbc(0x180); regmbc(0x253); regmbc(0x1d6c);
regmbc(0x1d80); regmbc(0x1e03); regmbc(0x1e05);
regmbc(0x1e07);
return;
case 'c':
case 0xe7:
case 0x107:
case 0x109:
case 0x10b:
case 0x10d:
case 0x188:
case 0x23c:
case 0x1e09:
case 0xa793:
case 0xa794:
regmbc('c'); regmbc(0xe7); regmbc(0x107);
regmbc(0x109); regmbc(0x10b); regmbc(0x10d);
regmbc(0x188); regmbc(0x23c); regmbc(0x1e09);
regmbc(0xa793); regmbc(0xa794);
return;
case 'd':
case 0x10f:
case 0x111:
case 0x257:
case 0x1d6d:
case 0x1d81:
case 0x1d91:
case 0x1e0b:
case 0x1e0d:
case 0x1e0f:
case 0x1e11:
case 0x1e13:
regmbc('d'); regmbc(0x10f); regmbc(0x111);
regmbc(0x257); regmbc(0x1d6d); regmbc(0x1d81);
regmbc(0x1d91); regmbc(0x1e0b); regmbc(0x1e0d);
regmbc(0x1e0f); regmbc(0x1e11); regmbc(0x1e13);
return;
case 'e':
case 0xe8:
case 0xe9:
case 0xea:
case 0xeb:
case 0x113:
case 0x115:
case 0x117:
case 0x119:
case 0x11b:
case 0x205:
case 0x207:
case 0x229:
case 0x247:
case 0x1d92:
case 0x1e15:
case 0x1e17:
case 0x1e19:
case 0x1e1b:
case 0x1eb9:
case 0x1ebb:
case 0x1e1d:
case 0x1ebd:
case 0x1ebf:
case 0x1ec1:
case 0x1ec3:
case 0x1ec5:
case 0x1ec7:
regmbc('e'); regmbc(0xe8); regmbc(0xe9);
regmbc(0xea); regmbc(0xeb); regmbc(0x113);
regmbc(0x115); regmbc(0x117); regmbc(0x119);
regmbc(0x11b); regmbc(0x205); regmbc(0x207);
regmbc(0x229); regmbc(0x247); regmbc(0x1d92);
regmbc(0x1e15); regmbc(0x1e17); regmbc(0x1e19);
regmbc(0x1e1b); regmbc(0x1e1d); regmbc(0x1eb9);
regmbc(0x1ebb); regmbc(0x1ebd); regmbc(0x1ebf);
regmbc(0x1ec1); regmbc(0x1ec3); regmbc(0x1ec5);
regmbc(0x1ec7);
return;
case 'f':
case 0x192:
case 0x1d6e:
case 0x1d82:
case 0x1e1f:
case 0xa799:
regmbc('f'); regmbc(0x192); regmbc(0x1d6e);
regmbc(0x1d82); regmbc(0x1e1f); regmbc(0xa799);
return;
case 'g':
case 0x11d:
case 0x11f:
case 0x121:
case 0x123:
case 0x1e5:
case 0x1e7:
case 0x260:
case 0x1f5:
case 0x1d83:
case 0x1e21:
case 0xa7a1:
regmbc('g'); regmbc(0x11d); regmbc(0x11f);
regmbc(0x121); regmbc(0x123); regmbc(0x1e5);
regmbc(0x1e7); regmbc(0x1f5); regmbc(0x260);
regmbc(0x1d83); regmbc(0x1e21); regmbc(0xa7a1);
return;
case 'h':
case 0x125:
case 0x127:
case 0x21f:
case 0x1e23:
case 0x1e25:
case 0x1e27:
case 0x1e29:
case 0x1e2b:
case 0x1e96:
case 0x2c68:
case 0xa795:
regmbc('h'); regmbc(0x125); regmbc(0x127);
regmbc(0x21f); regmbc(0x1e23); regmbc(0x1e25);
regmbc(0x1e27); regmbc(0x1e29); regmbc(0x1e2b);
regmbc(0x1e96); regmbc(0x2c68); regmbc(0xa795);
return;
case 'i':
case 0xec:
case 0xed:
case 0xee:
case 0xef:
case 0x129:
case 0x12b:
case 0x12d:
case 0x12f:
case 0x1d0:
case 0x209:
case 0x20b:
case 0x268:
case 0x1d96:
case 0x1e2d:
case 0x1e2f:
case 0x1ec9:
case 0x1ecb:
regmbc('i'); regmbc(0xec); regmbc(0xed);
regmbc(0xee); regmbc(0xef); regmbc(0x129);
regmbc(0x12b); regmbc(0x12d); regmbc(0x12f);
regmbc(0x1d0); regmbc(0x209); regmbc(0x20b);
regmbc(0x268); regmbc(0x1d96); regmbc(0x1e2d);
regmbc(0x1e2f); regmbc(0x1ec9); regmbc(0x1ecb);
return;
case 'j':
case 0x135:
case 0x1f0:
case 0x249:
regmbc('j'); regmbc(0x135); regmbc(0x1f0);
regmbc(0x249);
return;
case 'k':
case 0x137:
case 0x199:
case 0x1e9:
case 0x1d84:
case 0x1e31:
case 0x1e33:
case 0x1e35:
case 0x2c6a:
case 0xa741:
regmbc('k'); regmbc(0x137); regmbc(0x199);
regmbc(0x1e9); regmbc(0x1d84); regmbc(0x1e31);
regmbc(0x1e33); regmbc(0x1e35); regmbc(0x2c6a);
regmbc(0xa741);
return;
case 'l':
case 0x13a:
case 0x13c:
case 0x13e:
case 0x140:
case 0x142:
case 0x19a:
case 0x1e37:
case 0x1e39:
case 0x1e3b:
case 0x1e3d:
case 0x2c61:
regmbc('l'); regmbc(0x13a); regmbc(0x13c);
regmbc(0x13e); regmbc(0x140); regmbc(0x142);
regmbc(0x19a); regmbc(0x1e37); regmbc(0x1e39);
regmbc(0x1e3b); regmbc(0x1e3d); regmbc(0x2c61);
return;
case 'm':
case 0x1d6f:
case 0x1e3f:
case 0x1e41:
case 0x1e43:
regmbc('m'); regmbc(0x1d6f); regmbc(0x1e3f);
regmbc(0x1e41); regmbc(0x1e43);
return;
case 'n':
case 0xf1:
case 0x144:
case 0x146:
case 0x148:
case 0x149:
case 0x1f9:
case 0x1d70:
case 0x1d87:
case 0x1e45:
case 0x1e47:
case 0x1e49:
case 0x1e4b:
case 0xa7a5:
regmbc('n'); regmbc(0xf1); regmbc(0x144);
regmbc(0x146); regmbc(0x148); regmbc(0x149);
regmbc(0x1f9); regmbc(0x1d70); regmbc(0x1d87);
regmbc(0x1e45); regmbc(0x1e47); regmbc(0x1e49);
regmbc(0x1e4b); regmbc(0xa7a5);
return;
case 'o':
case 0xf2:
case 0xf3:
case 0xf4:
case 0xf5:
case 0xf6:
case 0xf8:
case 0x14d:
case 0x14f:
case 0x151:
case 0x1a1:
case 0x1d2:
case 0x1eb:
case 0x1ed:
case 0x1ff:
case 0x20d:
case 0x20f:
case 0x22b:
case 0x22d:
case 0x22f:
case 0x231:
case 0x275:
case 0x1e4d:
case 0x1e4f:
case 0x1e51:
case 0x1e53:
case 0x1ecd:
case 0x1ecf:
case 0x1ed1:
case 0x1ed3:
case 0x1ed5:
case 0x1ed7:
case 0x1ed9:
case 0x1edb:
case 0x1edd:
case 0x1edf:
case 0x1ee1:
case 0x1ee3:
regmbc('o'); regmbc(0xf2); regmbc(0xf3);
regmbc(0xf4); regmbc(0xf5); regmbc(0xf6);
regmbc(0xf8); regmbc(0x14d); regmbc(0x14f);
regmbc(0x151); regmbc(0x1a1); regmbc(0x1d2);
regmbc(0x1eb); regmbc(0x1ed); regmbc(0x1ff);
regmbc(0x20d); regmbc(0x20f); regmbc(0x22b);
regmbc(0x22d); regmbc(0x22f); regmbc(0x231);
regmbc(0x275); regmbc(0x1e4d); regmbc(0x1e4f);
regmbc(0x1e51); regmbc(0x1e53); regmbc(0x1ecd);
regmbc(0x1ecf); regmbc(0x1ed1); regmbc(0x1ed3);
regmbc(0x1ed5); regmbc(0x1ed7); regmbc(0x1ed9);
regmbc(0x1edb); regmbc(0x1edd); regmbc(0x1edf);
regmbc(0x1ee1); regmbc(0x1ee3);
return;
case 'p':
case 0x1a5:
case 0x1d71:
case 0x1d88:
case 0x1d7d:
case 0x1e55:
case 0x1e57:
regmbc('p'); regmbc(0x1a5); regmbc(0x1d71);
regmbc(0x1d7d); regmbc(0x1d88); regmbc(0x1e55);
regmbc(0x1e57);
return;
case 'q':
case 0x24b:
case 0x2a0:
regmbc('q'); regmbc(0x24b); regmbc(0x2a0);
return;
case 'r':
case 0x155:
case 0x157:
case 0x159:
case 0x211:
case 0x213:
case 0x24d:
case 0x27d:
case 0x1d72:
case 0x1d73:
case 0x1d89:
case 0x1e59:
case 0x1e5b:
case 0x1e5d:
case 0x1e5f:
case 0xa7a7:
regmbc('r'); regmbc(0x155); regmbc(0x157);
regmbc(0x159); regmbc(0x211); regmbc(0x213);
regmbc(0x24d); regmbc(0x1d72); regmbc(0x1d73);
regmbc(0x1d89); regmbc(0x1e59); regmbc(0x27d);
regmbc(0x1e5b); regmbc(0x1e5d); regmbc(0x1e5f);
regmbc(0xa7a7);
return;
case 's':
case 0x15b:
case 0x15d:
case 0x15f:
case 0x161:
case 0x1e61:
case 0x219:
case 0x23f:
case 0x1d74:
case 0x1d8a:
case 0x1e63:
case 0x1e65:
case 0x1e67:
case 0x1e69:
case 0xa7a9:
regmbc('s'); regmbc(0x15b); regmbc(0x15d);
regmbc(0x15f); regmbc(0x161); regmbc(0x23f);
regmbc(0x219); regmbc(0x1d74); regmbc(0x1d8a);
regmbc(0x1e61); regmbc(0x1e63); regmbc(0x1e65);
regmbc(0x1e67); regmbc(0x1e69); regmbc(0xa7a9);
return;
case 't':
case 0x163:
case 0x165:
case 0x167:
case 0x1ab:
case 0x1ad:
case 0x21b:
case 0x288:
case 0x1d75:
case 0x1e6b:
case 0x1e6d:
case 0x1e6f:
case 0x1e71:
case 0x1e97:
case 0x2c66:
regmbc('t'); regmbc(0x163); regmbc(0x165);
regmbc(0x167); regmbc(0x1ab); regmbc(0x21b);
regmbc(0x1ad); regmbc(0x288); regmbc(0x1d75);
regmbc(0x1e6b); regmbc(0x1e6d); regmbc(0x1e6f);
regmbc(0x1e71); regmbc(0x1e97); regmbc(0x2c66);
return;
case 'u':
case 0xf9:
case 0xfa:
case 0xfb:
case 0xfc:
case 0x169:
case 0x16b:
case 0x16d:
case 0x16f:
case 0x171:
case 0x173:
case 0x1b0:
case 0x1d4:
case 0x1d6:
case 0x1d8:
case 0x1da:
case 0x1dc:
case 0x215:
case 0x217:
case 0x289:
case 0x1e73:
case 0x1d7e:
case 0x1d99:
case 0x1e75:
case 0x1e77:
case 0x1e79:
case 0x1e7b:
case 0x1ee5:
case 0x1ee7:
case 0x1ee9:
case 0x1eeb:
case 0x1eed:
case 0x1eef:
case 0x1ef1:
regmbc('u'); regmbc(0xf9); regmbc(0xfa);
regmbc(0xfb); regmbc(0xfc); regmbc(0x169);
regmbc(0x16b); regmbc(0x16d); regmbc(0x16f);
regmbc(0x171); regmbc(0x173); regmbc(0x1d6);
regmbc(0x1d8); regmbc(0x1da); regmbc(0x1dc);
regmbc(0x215); regmbc(0x217); regmbc(0x1b0);
regmbc(0x1d4); regmbc(0x289); regmbc(0x1d7e);
regmbc(0x1d99); regmbc(0x1e73); regmbc(0x1e75);
regmbc(0x1e77); regmbc(0x1e79); regmbc(0x1e7b);
regmbc(0x1ee5); regmbc(0x1ee7); regmbc(0x1ee9);
regmbc(0x1eeb); regmbc(0x1eed); regmbc(0x1eef);
regmbc(0x1ef1);
return;
case 'v':
case 0x28b:
case 0x1d8c:
case 0x1e7d:
case 0x1e7f:
regmbc('v'); regmbc(0x28b); regmbc(0x1d8c);
regmbc(0x1e7d); regmbc(0x1e7f);
return;
case 'w':
case 0x175:
case 0x1e81:
case 0x1e83:
case 0x1e85:
case 0x1e87:
case 0x1e89:
case 0x1e98:
regmbc('w'); regmbc(0x175); regmbc(0x1e81);
regmbc(0x1e83); regmbc(0x1e85); regmbc(0x1e87);
regmbc(0x1e89); regmbc(0x1e98);
return;
case 'x':
case 0x1e8b:
case 0x1e8d:
regmbc('x'); regmbc(0x1e8b); regmbc(0x1e8d);
return;
case 'y':
case 0xfd:
case 0xff:
case 0x177:
case 0x1b4:
case 0x233:
case 0x24f:
case 0x1e8f:
case 0x1e99:
case 0x1ef3:
case 0x1ef5:
case 0x1ef7:
case 0x1ef9:
regmbc('y'); regmbc(0xfd); regmbc(0xff);
regmbc(0x177); regmbc(0x1b4); regmbc(0x233);
regmbc(0x24f); regmbc(0x1e8f); regmbc(0x1e99);
regmbc(0x1ef3); regmbc(0x1ef5); regmbc(0x1ef7);
regmbc(0x1ef9);
return;
case 'z':
case 0x17a:
case 0x17c:
case 0x17e:
case 0x1b6:
case 0x1d76:
case 0x1d8e:
case 0x1e91:
case 0x1e93:
case 0x1e95:
case 0x2c6c:
regmbc('z'); regmbc(0x17a); regmbc(0x17c);
regmbc(0x17e); regmbc(0x1b6); regmbc(0x1d76);
regmbc(0x1d8e); regmbc(0x1e91); regmbc(0x1e93);
regmbc(0x1e95); regmbc(0x2c6c);
return;
}
}
regmbc(c);
}
// Emit a node.
// Return pointer to generated code.
static uint8_t *regnode(int op)
{
uint8_t *ret;
ret = regcode;
if (ret == JUST_CALC_SIZE) {
regsize += 3;
} else {
*regcode++ = (uint8_t)op;
*regcode++ = NUL; // Null "next" pointer.
*regcode++ = NUL;
}
return ret;
}
// Write a four bytes number at "p" and return pointer to the next char.
static uint8_t *re_put_uint32(uint8_t *p, uint32_t val)
{
*p++ = (uint8_t)((val >> 24) & 0377);
*p++ = (uint8_t)((val >> 16) & 0377);
*p++ = (uint8_t)((val >> 8) & 0377);
*p++ = (uint8_t)(val & 0377);
return p;
}
// regnext - dig the "next" pointer out of a node
// Returns NULL when calculating size, when there is no next item and when
// there is an error.
static uint8_t *regnext(uint8_t *p)
FUNC_ATTR_NONNULL_ALL
{
int offset;
if (p == JUST_CALC_SIZE || reg_toolong) {
return NULL;
}
offset = NEXT(p);
if (offset == 0) {
return NULL;
}
if (OP(p) == BACK) {
return p - offset;
} else {
return p + offset;
}
}
// Set the next-pointer at the end of a node chain.
static void regtail(uint8_t *p, const uint8_t *val)
{
int offset;
if (p == JUST_CALC_SIZE) {
return;
}
// Find last node.
uint8_t *scan = p;
while (true) {
uint8_t *temp = regnext(scan);
if (temp == NULL) {
break;
}
scan = temp;
}
if (OP(scan) == BACK) {
offset = (int)(scan - val);
} else {
offset = (int)(val - scan);
}
// When the offset uses more than 16 bits it can no longer fit in the two
// bytes available. Use a global flag to avoid having to check return
// values in too many places.
if (offset > 0xffff) {
reg_toolong = true;
} else {
*(scan + 1) = (uint8_t)(((unsigned)offset >> 8) & 0377);
*(scan + 2) = (uint8_t)(offset & 0377);
}
}
// Like regtail, on item after a BRANCH; nop if none.
static void regoptail(uint8_t *p, uint8_t *val)
{
// When op is neither BRANCH nor BRACE_COMPLEX0-9, it is "operandless"
if (p == NULL || p == JUST_CALC_SIZE
|| (OP(p) != BRANCH
&& (OP(p) < BRACE_COMPLEX || OP(p) > BRACE_COMPLEX + 9))) {
return;
}
regtail(OPERAND(p), val);
}
// Insert an operator in front of already-emitted operand
//
// Means relocating the operand.
static void reginsert(int op, uint8_t *opnd)
{
uint8_t *src;
uint8_t *dst;
uint8_t *place;
if (regcode == JUST_CALC_SIZE) {
regsize += 3;
return;
}
src = regcode;
regcode += 3;
dst = regcode;
while (src > opnd) {
*--dst = *--src;
}
place = opnd; // Op node, where operand used to be.
*place++ = (uint8_t)op;
*place++ = NUL;
*place = NUL;
}
// Insert an operator in front of already-emitted operand.
// Add a number to the operator.
static void reginsert_nr(int op, int64_t val, uint8_t *opnd)
{
uint8_t *src;
uint8_t *dst;
uint8_t *place;
if (regcode == JUST_CALC_SIZE) {
regsize += 7;
return;
}
src = regcode;
regcode += 7;
dst = regcode;
while (src > opnd) {
*--dst = *--src;
}
place = opnd; // Op node, where operand used to be.
*place++ = (uint8_t)op;
*place++ = NUL;
*place++ = NUL;
assert(val >= 0 && (uintmax_t)val <= UINT32_MAX);
re_put_uint32(place, (uint32_t)val);
}
// Insert an operator in front of already-emitted operand.
// The operator has the given limit values as operands. Also set next pointer.
//
// Means relocating the operand.
static void reginsert_limits(int op, int64_t minval, int64_t maxval, uint8_t *opnd)
{
uint8_t *src;
uint8_t *dst;
uint8_t *place;
if (regcode == JUST_CALC_SIZE) {
regsize += 11;
return;
}
src = regcode;
regcode += 11;
dst = regcode;
while (src > opnd) {
*--dst = *--src;
}
place = opnd; // Op node, where operand used to be.
*place++ = (uint8_t)op;
*place++ = NUL;
*place++ = NUL;
assert(minval >= 0 && (uintmax_t)minval <= UINT32_MAX);
place = re_put_uint32(place, (uint32_t)minval);
assert(maxval >= 0 && (uintmax_t)maxval <= UINT32_MAX);
place = re_put_uint32(place, (uint32_t)maxval);
regtail(opnd, place);
}
/// Return true if the back reference is legal. We must have seen the close
/// brace.
/// TODO(vim): Should also check that we don't refer to something repeated
/// (+*=): what instance of the repetition should we match?
static int seen_endbrace(int refnum)
{
if (!had_endbrace[refnum]) {
uint8_t *p;
// Trick: check if "@<=" or "@<!" follows, in which case
// the \1 can appear before the referenced match.
for (p = (uint8_t *)regparse; *p != NUL; p++) {
if (p[0] == '@' && p[1] == '<' && (p[2] == '!' || p[2] == '=')) {
break;
}
}
if (*p == NUL) {
emsg(_("E65: Illegal back reference"));
rc_did_emsg = true;
return false;
}
}
return true;
}
// Parse the lowest level.
//
// Optimization: gobbles an entire sequence of ordinary characters so that
// it can turn them into a single node, which is smaller to store and
// faster to run. Don't do this when one_exactly is set.
static uint8_t *regatom(int *flagp)
{
uint8_t *ret;
int flags;
int c;
uint8_t *p;
int extra = 0;
int save_prev_at_start = prev_at_start;
*flagp = WORST; // Tentatively.
c = getchr();
switch (c) {
case Magic('^'):
ret = regnode(BOL);
break;
case Magic('$'):
ret = regnode(EOL);
had_eol = true;
break;
case Magic('<'):
ret = regnode(BOW);
break;
case Magic('>'):
ret = regnode(EOW);
break;
case Magic('_'):
c = no_Magic(getchr());
if (c == '^') { // "\_^" is start-of-line
ret = regnode(BOL);
break;
}
if (c == '$') { // "\_$" is end-of-line
ret = regnode(EOL);
had_eol = true;
break;
}
extra = ADD_NL;
*flagp |= HASNL;
// "\_[" is character range plus newline
if (c == '[') {
goto collection;
}
// "\_x" is character class plus newline
FALLTHROUGH;
// Character classes.
case Magic('.'):
case Magic('i'):
case Magic('I'):
case Magic('k'):
case Magic('K'):
case Magic('f'):
case Magic('F'):
case Magic('p'):
case Magic('P'):
case Magic('s'):
case Magic('S'):
case Magic('d'):
case Magic('D'):
case Magic('x'):
case Magic('X'):
case Magic('o'):
case Magic('O'):
case Magic('w'):
case Magic('W'):
case Magic('h'):
case Magic('H'):
case Magic('a'):
case Magic('A'):
case Magic('l'):
case Magic('L'):
case Magic('u'):
case Magic('U'):
p = (uint8_t *)vim_strchr((char *)classchars, no_Magic(c));
if (p == NULL) {
EMSG_RET_NULL(_(e_invalid_use_of_underscore));
}
// When '.' is followed by a composing char ignore the dot, so that
// the composing char is matched here.
if (c == Magic('.') && utf_iscomposing(peekchr())) {
c = getchr();
goto do_multibyte;
}
ret = regnode(classcodes[p - classchars] + extra);
*flagp |= HASWIDTH | SIMPLE;
break;
case Magic('n'):
if (reg_string) {
// In a string "\n" matches a newline character.
ret = regnode(EXACTLY);
regc(NL);
regc(NUL);
*flagp |= HASWIDTH | SIMPLE;
} else {
// In buffer text "\n" matches the end of a line.
ret = regnode(NEWL);
*flagp |= HASWIDTH | HASNL;
}
break;
case Magic('('):
if (one_exactly) {
EMSG_ONE_RET_NULL;
}
ret = reg(REG_PAREN, &flags);
if (ret == NULL) {
return NULL;
}
*flagp |= flags & (HASWIDTH | SPSTART | HASNL | HASLOOKBH);
break;
case NUL:
case Magic('|'):
case Magic('&'):
case Magic(')'):
if (one_exactly) {
EMSG_ONE_RET_NULL;
}
IEMSG_RET_NULL(_(e_internal)); // Supposed to be caught earlier.
// NOTREACHED
case Magic('='):
case Magic('?'):
case Magic('+'):
case Magic('@'):
case Magic('{'):
case Magic('*'):
c = no_Magic(c);
EMSG3_RET_NULL(_("E64: %s%c follows nothing"),
(c == '*' ? reg_magic >= MAGIC_ON : reg_magic == MAGIC_ALL), c);
// NOTREACHED
case Magic('~'): // previous substitute pattern
if (reg_prev_sub != NULL) {
uint8_t *lp;
ret = regnode(EXACTLY);
lp = (uint8_t *)reg_prev_sub;
while (*lp != NUL) {
regc(*lp++);
}
regc(NUL);
if (*reg_prev_sub != NUL) {
*flagp |= HASWIDTH;
if ((lp - (uint8_t *)reg_prev_sub) == 1) {
*flagp |= SIMPLE;
}
}
} else {
EMSG_RET_NULL(_(e_nopresub));
}
break;
case Magic('1'):
case Magic('2'):
case Magic('3'):
case Magic('4'):
case Magic('5'):
case Magic('6'):
case Magic('7'):
case Magic('8'):
case Magic('9'): {
int refnum;
refnum = c - Magic('0');
if (!seen_endbrace(refnum)) {
return NULL;
}
ret = regnode(BACKREF + refnum);
}
break;
case Magic('z'):
c = no_Magic(getchr());
switch (c) {
case '(':
if ((reg_do_extmatch & REX_SET) == 0) {
EMSG_RET_NULL(_(e_z_not_allowed));
}
if (one_exactly) {
EMSG_ONE_RET_NULL;
}
ret = reg(REG_ZPAREN, &flags);
if (ret == NULL) {
return NULL;
}
*flagp |= flags & (HASWIDTH|SPSTART|HASNL|HASLOOKBH);
re_has_z = REX_SET;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if ((reg_do_extmatch & REX_USE) == 0) {
EMSG_RET_NULL(_(e_z1_not_allowed));
}
ret = regnode(ZREF + c - '0');
re_has_z = REX_USE;
break;
case 's':
ret = regnode(MOPEN + 0);
if (!re_mult_next("\\zs")) {
return NULL;
}
break;
case 'e':
ret = regnode(MCLOSE + 0);
if (!re_mult_next("\\ze")) {
return NULL;
}
break;
default:
EMSG_RET_NULL(_("E68: Invalid character after \\z"));
}
break;
case Magic('%'):
c = no_Magic(getchr());
switch (c) {
// () without a back reference
case '(':
if (one_exactly) {
EMSG_ONE_RET_NULL;
}
ret = reg(REG_NPAREN, &flags);
if (ret == NULL) {
return NULL;
}
*flagp |= flags & (HASWIDTH | SPSTART | HASNL | HASLOOKBH);
break;
// Catch \%^ and \%$ regardless of where they appear in the
// pattern -- regardless of whether or not it makes sense.
case '^':
ret = regnode(RE_BOF);
break;
case '$':
ret = regnode(RE_EOF);
break;
case '#':
if (regparse[0] == '=' && regparse[1] >= 48 && regparse[1] <= 50) {
// misplaced \%#=1
semsg(_(e_atom_engine_must_be_at_start_of_pattern), regparse[1]);
return FAIL;
}
ret = regnode(CURSOR);
break;
case 'V':
ret = regnode(RE_VISUAL);
break;
case 'C':
ret = regnode(RE_COMPOSING);
break;
// \%[abc]: Emit as a list of branches, all ending at the last
// branch which matches nothing.
case '[':
if (one_exactly) { // doesn't nest
EMSG_ONE_RET_NULL;
}
{
uint8_t *lastbranch;
uint8_t *lastnode = NULL;
uint8_t *br;
ret = NULL;
while ((c = getchr()) != ']') {
if (c == NUL) {
EMSG2_RET_NULL(_(e_missing_sb),
reg_magic == MAGIC_ALL);
}
br = regnode(BRANCH);
if (ret == NULL) {
ret = br;
} else {
regtail(lastnode, br);
if (reg_toolong) {
return NULL;
}
}
ungetchr();
one_exactly = true;
lastnode = regatom(flagp);
one_exactly = false;
if (lastnode == NULL) {
return NULL;
}
}
if (ret == NULL) {
EMSG2_RET_NULL(_(e_empty_sb),
reg_magic == MAGIC_ALL);
}
lastbranch = regnode(BRANCH);
br = regnode(NOTHING);
if (ret != JUST_CALC_SIZE) {
regtail(lastnode, br);
regtail(lastbranch, br);
// connect all branches to the NOTHING
// branch at the end
for (br = ret; br != lastnode;) {
if (OP(br) == BRANCH) {
regtail(br, lastbranch);
if (reg_toolong) {
return NULL;
}
br = OPERAND(br);
} else {
br = regnext(br);
}
}
}
*flagp &= ~(HASWIDTH | SIMPLE);
break;
}
case 'd': // %d123 decimal
case 'o': // %o123 octal
case 'x': // %xab hex 2
case 'u': // %uabcd hex 4
case 'U': // %U1234abcd hex 8
{
int64_t i;
switch (c) {
case 'd':
i = getdecchrs(); break;
case 'o':
i = getoctchrs(); break;
case 'x':
i = gethexchrs(2); break;
case 'u':
i = gethexchrs(4); break;
case 'U':
i = gethexchrs(8); break;
default:
i = -1; break;
}
if (i < 0 || i > INT_MAX) {
EMSG2_RET_NULL(_("E678: Invalid character after %s%%[dxouU]"),
reg_magic == MAGIC_ALL);
}
if (use_multibytecode((int)i)) {
ret = regnode(MULTIBYTECODE);
} else {
ret = regnode(EXACTLY);
}
if (i == 0) {
regc(0x0a);
} else {
regmbc((int)i);
}
regc(NUL);
*flagp |= HASWIDTH;
break;
}
default:
if (ascii_isdigit(c) || c == '<' || c == '>' || c == '\'' || c == '.') {
uint32_t n = 0;
int cmp;
bool cur = false;
bool got_digit = false;
cmp = c;
if (cmp == '<' || cmp == '>') {
c = getchr();
}
if (no_Magic(c) == '.') {
cur = true;
c = getchr();
}
while (ascii_isdigit(c)) {
got_digit = true;
n = n * 10 + (uint32_t)(c - '0');
c = getchr();
}
if (c == '\'' && n == 0) {
// "\%'m", "\%<'m" and "\%>'m": Mark
c = getchr();
ret = regnode(RE_MARK);
if (ret == JUST_CALC_SIZE) {
regsize += 2;
} else {
*regcode++ = (uint8_t)c;
*regcode++ = (uint8_t)cmp;
}
break;
} else if ((c == 'l' || c == 'c' || c == 'v') && (cur || got_digit)) {
if (cur && n) {
semsg(_(e_regexp_number_after_dot_pos_search_chr), no_Magic(c));
rc_did_emsg = true;
return NULL;
}
if (c == 'l') {
if (cur) {
n = (uint32_t)curwin->w_cursor.lnum;
}
ret = regnode(RE_LNUM);
if (save_prev_at_start) {
at_start = true;
}
} else if (c == 'c') {
if (cur) {
n = (uint32_t)curwin->w_cursor.col;
n++;
}
ret = regnode(RE_COL);
} else {
if (cur) {
colnr_T vcol = 0;
getvvcol(curwin, &curwin->w_cursor, NULL, NULL, &vcol);
n = (uint32_t)(++vcol);
}
ret = regnode(RE_VCOL);
}
if (ret == JUST_CALC_SIZE) {
regsize += 5;
} else {
// put the number and the optional
// comparator after the opcode
regcode = re_put_uint32(regcode, n);
*regcode++ = (uint8_t)cmp;
}
break;
}
}
EMSG2_RET_NULL(_("E71: Invalid character after %s%%"),
reg_magic == MAGIC_ALL);
}
break;
case Magic('['):
collection:
{
uint8_t *lp;
// If there is no matching ']', we assume the '[' is a normal
// character. This makes 'incsearch' and ":help [" work.
lp = (uint8_t *)skip_anyof(regparse);
if (*lp == ']') { // there is a matching ']'
int startc = -1; // > 0 when next '-' is a range
int endc;
// In a character class, different parsing rules apply.
// Not even \ is special anymore, nothing is.
if (*regparse == '^') { // Complement of range.
ret = regnode(ANYBUT + extra);
regparse++;
} else {
ret = regnode(ANYOF + extra);
}
// At the start ']' and '-' mean the literal character.
if (*regparse == ']' || *regparse == '-') {
startc = (uint8_t)(*regparse);
regc(*regparse++);
}
while (*regparse != NUL && *regparse != ']') {
if (*regparse == '-') {
regparse++;
// The '-' is not used for a range at the end and
// after or before a '\n'.
if (*regparse == ']' || *regparse == NUL
|| startc == -1
|| (regparse[0] == '\\' && regparse[1] == 'n')) {
regc('-');
startc = '-'; // [--x] is a range
} else {
// Also accept "a-[.z.]"
endc = 0;
if (*regparse == '[') {
endc = get_coll_element(&regparse);
}
if (endc == 0) {
endc = mb_ptr2char_adv((const char **)&regparse);
}
// Handle \o40, \x20 and \u20AC style sequences
if (endc == '\\' && !reg_cpo_lit) {
endc = coll_get_char();
}
if (startc > endc) {
EMSG_RET_NULL(_(e_reverse_range));
}
if (utf_char2len(startc) > 1
|| utf_char2len(endc) > 1) {
// Limit to a range of 256 chars
if (endc > startc + 256) {
EMSG_RET_NULL(_(e_large_class));
}
while (++startc <= endc) {
regmbc(startc);
}
} else {
while (++startc <= endc) {
regc(startc);
}
}
startc = -1;
}
}
// Only "\]", "\^", "\]" and "\\" are special in Vi. Vim
// accepts "\t", "\e", etc., but only when the 'l' flag in
// 'cpoptions' is not included.
else if (*regparse == '\\'
&& (vim_strchr(REGEXP_INRANGE, (uint8_t)regparse[1]) != NULL
|| (!reg_cpo_lit
&& vim_strchr(REGEXP_ABBR,
(uint8_t)regparse[1]) != NULL))) {
regparse++;
if (*regparse == 'n') {
// '\n' in range: also match NL
if (ret != JUST_CALC_SIZE) {
// Using \n inside [^] does not change what
// matches. "[^\n]" is the same as ".".
if (*ret == ANYOF) {
*ret = ANYOF + ADD_NL;
*flagp |= HASNL;
}
// else: must have had a \n already
}
regparse++;
startc = -1;
} else if (*regparse == 'd'
|| *regparse == 'o'
|| *regparse == 'x'
|| *regparse == 'u'
|| *regparse == 'U') {
startc = coll_get_char();
if (startc == 0) {
regc(0x0a);
} else {
regmbc(startc);
}
} else {
startc = backslash_trans(*regparse++);
regc(startc);
}
} else if (*regparse == '[') {
int c_class;
int cu;
c_class = get_char_class(&regparse);
startc = -1;
// Characters assumed to be 8 bits!
switch (c_class) {
case CLASS_NONE:
c_class = get_equi_class(&regparse);
if (c_class != 0) {
// produce equivalence class
reg_equi_class(c_class);
} else if ((c_class = get_coll_element(&regparse)) != 0) {
// produce a collating element
regmbc(c_class);
} else {
// literal '[', allow [[-x] as a range
startc = (uint8_t)(*regparse++);
regc(startc);
}
break;
case CLASS_ALNUM:
for (cu = 1; cu < 128; cu++) {
if (isalnum(cu)) {
regmbc(cu);
}
}
break;
case CLASS_ALPHA:
for (cu = 1; cu < 128; cu++) {
if (isalpha(cu)) {
regmbc(cu);
}
}
break;
case CLASS_BLANK:
regc(' ');
regc('\t');
break;
case CLASS_CNTRL:
for (cu = 1; cu <= 127; cu++) {
if (iscntrl(cu)) {
regmbc(cu);
}
}
break;
case CLASS_DIGIT:
for (cu = 1; cu <= 127; cu++) {
if (ascii_isdigit(cu)) {
regmbc(cu);
}
}
break;
case CLASS_GRAPH:
for (cu = 1; cu <= 127; cu++) {
if (isgraph(cu)) {
regmbc(cu);
}
}
break;
case CLASS_LOWER:
for (cu = 1; cu <= 255; cu++) {
if (mb_islower(cu) && cu != 170 && cu != 186) {
regmbc(cu);
}
}
break;
case CLASS_PRINT:
for (cu = 1; cu <= 255; cu++) {
if (vim_isprintc(cu)) {
regmbc(cu);
}
}
break;
case CLASS_PUNCT:
for (cu = 1; cu < 128; cu++) {
if (ispunct(cu)) {
regmbc(cu);
}
}
break;
case CLASS_SPACE:
for (cu = 9; cu <= 13; cu++) {
regc(cu);
}
regc(' ');
break;
case CLASS_UPPER:
for (cu = 1; cu <= 255; cu++) {
if (mb_isupper(cu)) {
regmbc(cu);
}
}
break;
case CLASS_XDIGIT:
for (cu = 1; cu <= 255; cu++) {
if (ascii_isxdigit(cu)) {
regmbc(cu);
}
}
break;
case CLASS_TAB:
regc('\t');
break;
case CLASS_RETURN:
regc('\r');
break;
case CLASS_BACKSPACE:
regc('\b');
break;
case CLASS_ESCAPE:
regc(ESC);
break;
case CLASS_IDENT:
for (cu = 1; cu <= 255; cu++) {
if (vim_isIDc(cu)) {
regmbc(cu);
}
}
break;
case CLASS_KEYWORD:
for (cu = 1; cu <= 255; cu++) {
if (reg_iswordc(cu)) {
regmbc(cu);
}
}
break;
case CLASS_FNAME:
for (cu = 1; cu <= 255; cu++) {
if (vim_isfilec(cu)) {
regmbc(cu);
}
}
break;
}
} else {
// produce a multibyte character, including any
// following composing characters.
startc = utf_ptr2char(regparse);
int len = utfc_ptr2len(regparse);
if (utf_char2len(startc) != len) {
// composing chars
startc = -1;
}
while (--len >= 0) {
regc(*regparse++);
}
}
}
regc(NUL);
prevchr_len = 1; // last char was the ']'
if (*regparse != ']') {
EMSG_RET_NULL(_(e_toomsbra)); // Cannot happen?
}
skipchr(); // let's be friends with the lexer again
*flagp |= HASWIDTH | SIMPLE;
break;
} else if (reg_strict) {
EMSG2_RET_NULL(_(e_missingbracket), reg_magic > MAGIC_OFF);
}
}
FALLTHROUGH;
default: {
int len;
// A multi-byte character is handled as a separate atom if it's
// before a multi and when it's a composing char.
if (use_multibytecode(c)) {
do_multibyte:
ret = regnode(MULTIBYTECODE);
regmbc(c);
*flagp |= HASWIDTH | SIMPLE;
break;
}
ret = regnode(EXACTLY);
// Append characters as long as:
// - there is no following multi, we then need the character in
// front of it as a single character operand
// - not running into a Magic character
// - "one_exactly" is not set
// But always emit at least one character. Might be a Multi,
// e.g., a "[" without matching "]".
for (len = 0; c != NUL && (len == 0
|| (re_multi_type(peekchr()) == NOT_MULTI
&& !one_exactly
&& !is_Magic(c))); len++) {
c = no_Magic(c);
{
regmbc(c);
{
int l;
// Need to get composing character too.
while (true) {
l = utf_ptr2len(regparse);
if (!utf_composinglike(regparse, regparse + l)) {
break;
}
regmbc(utf_ptr2char(regparse));
skipchr();
}
}
}
c = getchr();
}
ungetchr();
regc(NUL);
*flagp |= HASWIDTH;
if (len == 1) {
*flagp |= SIMPLE;
}
}
break;
}
return ret;
}
// Parse something followed by possible [*+=].
//
// Note that the branching code sequences used for = and the general cases
// of * and + are somewhat optimized: they use the same NOTHING node as
// both the endmarker for their branch list and the body of the last branch.
// It might seem that this node could be dispensed with entirely, but the
// endmarker role is not redundant.
static uint8_t *regpiece(int *flagp)
{
uint8_t *ret;
int op;
uint8_t *next;
int flags;
int minval;
int maxval;
ret = regatom(&flags);
if (ret == NULL) {
return NULL;
}
op = peekchr();
if (re_multi_type(op) == NOT_MULTI) {
*flagp = flags;
return ret;
}
// default flags
*flagp = (WORST | SPSTART | (flags & (HASNL | HASLOOKBH)));
skipchr();
switch (op) {
case Magic('*'):
if (flags & SIMPLE) {
reginsert(STAR, ret);
} else {
// Emit x* as (x&|), where & means "self".
reginsert(BRANCH, ret); // Either x
regoptail(ret, regnode(BACK)); // and loop
regoptail(ret, ret); // back
regtail(ret, regnode(BRANCH)); // or
regtail(ret, regnode(NOTHING)); // null.
}
break;
case Magic('+'):
if (flags & SIMPLE) {
reginsert(PLUS, ret);
} else {
// Emit x+ as x(&|), where & means "self".
next = regnode(BRANCH); // Either
regtail(ret, next);
regtail(regnode(BACK), ret); // loop back
regtail(next, regnode(BRANCH)); // or
regtail(ret, regnode(NOTHING)); // null.
}
*flagp = (WORST | HASWIDTH | (flags & (HASNL | HASLOOKBH)));
break;
case Magic('@'): {
int lop = END;
int64_t nr = getdecchrs();
switch (no_Magic(getchr())) {
case '=':
lop = MATCH; break; // \@=
case '!':
lop = NOMATCH; break; // \@!
case '>':
lop = SUBPAT; break; // \@>
case '<':
switch (no_Magic(getchr())) {
case '=':
lop = BEHIND; break; // \@<=
case '!':
lop = NOBEHIND; break; // \@<!
}
}
if (lop == END) {
EMSG2_RET_NULL(_(e_invalid_character_after_str_at),
reg_magic == MAGIC_ALL);
}
// Look behind must match with behind_pos.
if (lop == BEHIND || lop == NOBEHIND) {
regtail(ret, regnode(BHPOS));
*flagp |= HASLOOKBH;
}
regtail(ret, regnode(END)); // operand ends
if (lop == BEHIND || lop == NOBEHIND) {
if (nr < 0) {
nr = 0; // no limit is same as zero limit
}
reginsert_nr(lop, (uint32_t)nr, ret);
} else {
reginsert(lop, ret);
}
break;
}
case Magic('?'):
case Magic('='):
// Emit x= as (x|)
reginsert(BRANCH, ret); // Either x
regtail(ret, regnode(BRANCH)); // or
next = regnode(NOTHING); // null.
regtail(ret, next);
regoptail(ret, next);
break;
case Magic('{'):
if (!read_limits(&minval, &maxval)) {
return NULL;
}
if (flags & SIMPLE) {
reginsert(BRACE_SIMPLE, ret);
reginsert_limits(BRACE_LIMITS, minval, maxval, ret);
} else {
if (num_complex_braces >= 10) {
EMSG2_RET_NULL(_("E60: Too many complex %s{...}s"),
reg_magic == MAGIC_ALL);
}
reginsert(BRACE_COMPLEX + num_complex_braces, ret);
regoptail(ret, regnode(BACK));
regoptail(ret, ret);
reginsert_limits(BRACE_LIMITS, minval, maxval, ret);
num_complex_braces++;
}
if (minval > 0 && maxval > 0) {
*flagp = (HASWIDTH | (flags & (HASNL | HASLOOKBH)));
}
break;
}
if (re_multi_type(peekchr()) != NOT_MULTI) {
// Can't have a multi follow a multi.
if (peekchr() == Magic('*')) {
EMSG2_RET_NULL(_("E61: Nested %s*"), reg_magic >= MAGIC_ON);
}
EMSG3_RET_NULL(_("E62: Nested %s%c"), reg_magic == MAGIC_ALL, no_Magic(peekchr()));
}
return ret;
}
// Parse one alternative of an | or & operator.
// Implements the concatenation operator.
static uint8_t *regconcat(int *flagp)
{
uint8_t *first = NULL;
uint8_t *chain = NULL;
uint8_t *latest;
int flags;
int cont = true;
*flagp = WORST; // Tentatively.
while (cont) {
switch (peekchr()) {
case NUL:
case Magic('|'):
case Magic('&'):
case Magic(')'):
cont = false;
break;
case Magic('Z'):
regflags |= RF_ICOMBINE;
skipchr_keepstart();
break;
case Magic('c'):
regflags |= RF_ICASE;
skipchr_keepstart();
break;
case Magic('C'):
regflags |= RF_NOICASE;
skipchr_keepstart();
break;
case Magic('v'):
reg_magic = MAGIC_ALL;
skipchr_keepstart();
curchr = -1;
break;
case Magic('m'):
reg_magic = MAGIC_ON;
skipchr_keepstart();
curchr = -1;
break;
case Magic('M'):
reg_magic = MAGIC_OFF;
skipchr_keepstart();
curchr = -1;
break;
case Magic('V'):
reg_magic = MAGIC_NONE;
skipchr_keepstart();
curchr = -1;
break;
default:
latest = regpiece(&flags);
if (latest == NULL || reg_toolong) {
return NULL;
}
*flagp |= flags & (HASWIDTH | HASNL | HASLOOKBH);
if (chain == NULL) { // First piece.
*flagp |= flags & SPSTART;
} else {
regtail(chain, latest);
}
chain = latest;
if (first == NULL) {
first = latest;
}
break;
}
}
if (first == NULL) { // Loop ran zero times.
first = regnode(NOTHING);
}
return first;
}
// Parse one alternative of an | operator.
// Implements the & operator.
static uint8_t *regbranch(int *flagp)
{
uint8_t *ret;
uint8_t *chain = NULL;
uint8_t *latest;
int flags;
*flagp = WORST | HASNL; // Tentatively.
ret = regnode(BRANCH);
while (true) {
latest = regconcat(&flags);
if (latest == NULL) {
return NULL;
}
// If one of the branches has width, the whole thing has. If one of
// the branches anchors at start-of-line, the whole thing does.
// If one of the branches uses look-behind, the whole thing does.
*flagp |= flags & (HASWIDTH | SPSTART | HASLOOKBH);
// If one of the branches doesn't match a line-break, the whole thing
// doesn't.
*flagp &= ~HASNL | (flags & HASNL);
if (chain != NULL) {
regtail(chain, latest);
}
if (peekchr() != Magic('&')) {
break;
}
skipchr();
regtail(latest, regnode(END)); // operand ends
if (reg_toolong) {
break;
}
reginsert(MATCH, latest);
chain = latest;
}
return ret;
}
/// Parse regular expression, i.e. main body or parenthesized thing.
///
/// Caller must absorb opening parenthesis.
///
/// Combining parenthesis handling with the base level of regular expression
/// is a trifle forced, but the need to tie the tails of the branches to what
/// follows makes it hard to avoid.
///
/// @param paren REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN
static uint8_t *reg(int paren, int *flagp)
{
uint8_t *ret;
uint8_t *br;
uint8_t *ender;
int parno = 0;
int flags;
*flagp = HASWIDTH; // Tentatively.
if (paren == REG_ZPAREN) {
// Make a ZOPEN node.
if (regnzpar >= NSUBEXP) {
EMSG_RET_NULL(_("E50: Too many \\z("));
}
parno = regnzpar;
regnzpar++;
ret = regnode(ZOPEN + parno);
} else if (paren == REG_PAREN) {
// Make a MOPEN node.
if (regnpar >= NSUBEXP) {
EMSG2_RET_NULL(_("E51: Too many %s("), reg_magic == MAGIC_ALL);
}
parno = regnpar;
regnpar++;
ret = regnode(MOPEN + parno);
} else if (paren == REG_NPAREN) {
// Make a NOPEN node.
ret = regnode(NOPEN);
} else {
ret = NULL;
}
// Pick up the branches, linking them together.
br = regbranch(&flags);
if (br == NULL) {
return NULL;
}
if (ret != NULL) {
regtail(ret, br); // [MZ]OPEN -> first.
} else {
ret = br;
}
// If one of the branches can be zero-width, the whole thing can.
// If one of the branches has * at start or matches a line-break, the
// whole thing can.
if (!(flags & HASWIDTH)) {
*flagp &= ~HASWIDTH;
}
*flagp |= flags & (SPSTART | HASNL | HASLOOKBH);
while (peekchr() == Magic('|')) {
skipchr();
br = regbranch(&flags);
if (br == NULL || reg_toolong) {
return NULL;
}
regtail(ret, br); // BRANCH -> BRANCH.
if (!(flags & HASWIDTH)) {
*flagp &= ~HASWIDTH;
}
*flagp |= flags & (SPSTART | HASNL | HASLOOKBH);
}
// Make a closing node, and hook it on the end.
ender = regnode(paren == REG_ZPAREN ? ZCLOSE + parno
: paren == REG_PAREN ? MCLOSE + parno
: paren == REG_NPAREN ? NCLOSE : END);
regtail(ret, ender);
// Hook the tails of the branches to the closing node.
for (br = ret; br != NULL; br = regnext(br)) {
regoptail(br, ender);
}
// Check for proper termination.
if (paren != REG_NOPAREN && getchr() != Magic(')')) {
if (paren == REG_ZPAREN) {
EMSG_RET_NULL(_("E52: Unmatched \\z("));
} else if (paren == REG_NPAREN) {
EMSG2_RET_NULL(_(e_unmatchedpp), reg_magic == MAGIC_ALL);
} else {
EMSG2_RET_NULL(_(e_unmatchedp), reg_magic == MAGIC_ALL);
}
} else if (paren == REG_NOPAREN && peekchr() != NUL) {
if (curchr == Magic(')')) {
EMSG2_RET_NULL(_(e_unmatchedpar), reg_magic == MAGIC_ALL);
} else {
EMSG_RET_NULL(_(e_trailing)); // "Can't happen".
}
// NOTREACHED
}
// Here we set the flag allowing back references to this set of
// parentheses.
if (paren == REG_PAREN) {
had_endbrace[parno] = true; // have seen the close paren
}
return ret;
}
// bt_regcomp() - compile a regular expression into internal code for the
// traditional back track matcher.
// Returns the program in allocated space. Returns NULL for an error.
//
// We can't allocate space until we know how big the compiled form will be,
// but we can't compile it (and thus know how big it is) until we've got a
// place to put the code. So we cheat: we compile it twice, once with code
// generation turned off and size counting turned on, and once "for real".
// This also means that we don't allocate space until we are sure that the
// thing really will compile successfully, and we never have to move the
// code and thus invalidate pointers into it. (Note that it has to be in
// one piece because free() must be able to free it all.)
//
// Whether upper/lower case is to be ignored is decided when executing the
// program, it does not matter here.
//
// Beware that the optimization-preparation code in here knows about some
// of the structure of the compiled regexp.
// "re_flags": RE_MAGIC and/or RE_STRING.
static regprog_T *bt_regcomp(uint8_t *expr, int re_flags)
{
uint8_t *scan;
uint8_t *longest;
int len;
int flags;
if (expr == NULL) {
IEMSG_RET_NULL(_(e_null));
}
init_class_tab();
// First pass: determine size, legality.
regcomp_start(expr, re_flags);
regcode = JUST_CALC_SIZE;
regc(REGMAGIC);
if (reg(REG_NOPAREN, &flags) == NULL) {
return NULL;
}
// Allocate space.
bt_regprog_T *r = xmalloc(offsetof(bt_regprog_T, program) + (size_t)regsize);
r->re_in_use = false;
// Second pass: emit code.
regcomp_start(expr, re_flags);
regcode = r->program;
regc(REGMAGIC);
if (reg(REG_NOPAREN, &flags) == NULL || reg_toolong) {
xfree(r);
if (reg_toolong) {
EMSG_RET_NULL(_("E339: Pattern too long"));
}
return NULL;
}
// Dig out information for optimizations.
r->regstart = NUL; // Worst-case defaults.
r->reganch = 0;
r->regmust = NULL;
r->regmlen = 0;
r->regflags = regflags;
if (flags & HASNL) {
r->regflags |= RF_HASNL;
}
if (flags & HASLOOKBH) {
r->regflags |= RF_LOOKBH;
}
// Remember whether this pattern has any \z specials in it.
r->reghasz = (uint8_t)re_has_z;
scan = r->program + 1; // First BRANCH.
if (OP(regnext(scan)) == END) { // Only one top-level choice.
scan = OPERAND(scan);
// Starting-point info.
if (OP(scan) == BOL || OP(scan) == RE_BOF) {
r->reganch++;
scan = regnext(scan);
}
if (OP(scan) == EXACTLY) {
r->regstart = utf_ptr2char((char *)OPERAND(scan));
} else if (OP(scan) == BOW
|| OP(scan) == EOW
|| OP(scan) == NOTHING
|| OP(scan) == MOPEN + 0 || OP(scan) == NOPEN
|| OP(scan) == MCLOSE + 0 || OP(scan) == NCLOSE) {
uint8_t *regnext_scan = regnext(scan);
if (OP(regnext_scan) == EXACTLY) {
r->regstart = utf_ptr2char((char *)OPERAND(regnext_scan));
}
}
// If there's something expensive in the r.e., find the longest
// literal string that must appear and make it the regmust. Resolve
// ties in favor of later strings, since the regstart check works
// with the beginning of the r.e. and avoiding duplication
// strengthens checking. Not a strong reason, but sufficient in the
// absence of others.
// When the r.e. starts with BOW, it is faster to look for a regmust
// first. Used a lot for "#" and "*" commands. (Added by mool).
if ((flags & SPSTART || OP(scan) == BOW || OP(scan) == EOW)
&& !(flags & HASNL)) {
longest = NULL;
len = 0;
for (; scan != NULL; scan = regnext(scan)) {
if (OP(scan) == EXACTLY && strlen((char *)OPERAND(scan)) >= (size_t)len) {
longest = OPERAND(scan);
len = (int)strlen((char *)OPERAND(scan));
}
}
r->regmust = longest;
r->regmlen = len;
}
}
#ifdef BT_REGEXP_DUMP
regdump(expr, r);
#endif
r->engine = &bt_regengine;
return (regprog_T *)r;
}
// Check if during the previous call to vim_regcomp the EOL item "$" has been
// found. This is messy, but it works fine.
int vim_regcomp_had_eol(void)
{
return had_eol;
}
// Get a number after a backslash that is inside [].
// When nothing is recognized return a backslash.
static int coll_get_char(void)
{
int64_t nr = -1;
switch (*regparse++) {
case 'd':
nr = getdecchrs(); break;
case 'o':
nr = getoctchrs(); break;
case 'x':
nr = gethexchrs(2); break;
case 'u':
nr = gethexchrs(4); break;
case 'U':
nr = gethexchrs(8); break;
}
if (nr < 0 || nr > INT_MAX) {
// If getting the number fails be backwards compatible: the character
// is a backslash.
regparse--;
nr = '\\';
}
return (int)nr;
}
// Free a compiled regexp program, returned by bt_regcomp().
static void bt_regfree(regprog_T *prog)
{
xfree(prog);
}
#define ADVANCE_REGINPUT() MB_PTR_ADV(rex.input)
// The arguments from BRACE_LIMITS are stored here. They are actually local
// to regmatch(), but they are here to reduce the amount of stack space used
// (it can be called recursively many times).
static int64_t bl_minval;
static int64_t bl_maxval;
// Save the input line and position in a regsave_T.
static void reg_save(regsave_T *save, garray_T *gap)
FUNC_ATTR_NONNULL_ALL
{
if (REG_MULTI) {
save->rs_u.pos.col = (colnr_T)(rex.input - rex.line);
save->rs_u.pos.lnum = rex.lnum;
} else {
save->rs_u.ptr = rex.input;
}
save->rs_len = gap->ga_len;
}
// Restore the input line and position from a regsave_T.
static void reg_restore(regsave_T *save, garray_T *gap)
FUNC_ATTR_NONNULL_ALL
{
if (REG_MULTI) {
if (rex.lnum != save->rs_u.pos.lnum) {
// only call reg_getline() when the line number changed to save
// a bit of time
rex.lnum = save->rs_u.pos.lnum;
rex.line = (uint8_t *)reg_getline(rex.lnum);
}
rex.input = rex.line + save->rs_u.pos.col;
} else {
rex.input = save->rs_u.ptr;
}
gap->ga_len = save->rs_len;
}
// Return true if current position is equal to saved position.
static bool reg_save_equal(const regsave_T *save)
FUNC_ATTR_NONNULL_ALL
{
if (REG_MULTI) {
return rex.lnum == save->rs_u.pos.lnum
&& rex.input == rex.line + save->rs_u.pos.col;
}
return rex.input == save->rs_u.ptr;
}
// Save the sub-expressions before attempting a match.
#define save_se(savep, posp, pp) \
REG_MULTI ? save_se_multi((savep), (posp)) : save_se_one((savep), (pp))
// After a failed match restore the sub-expressions.
#define restore_se(savep, posp, pp) { \
if (REG_MULTI) \
*(posp) = (savep)->se_u.pos; \
else \
*(pp) = (savep)->se_u.ptr; }
// Tentatively set the sub-expression start to the current position (after
// calling regmatch() they will have changed). Need to save the existing
// values for when there is no match.
// Use se_save() to use pointer (save_se_multi()) or position (save_se_one()),
// depending on REG_MULTI.
static void save_se_multi(save_se_T *savep, lpos_T *posp)
{
savep->se_u.pos = *posp;
posp->lnum = rex.lnum;
posp->col = (colnr_T)(rex.input - rex.line);
}
static void save_se_one(save_se_T *savep, uint8_t **pp)
{
savep->se_u.ptr = *pp;
*pp = rex.input;
}
/// regrepeat - repeatedly match something simple, return how many.
/// Advances rex.input (and rex.lnum) to just after the matched chars.
///
/// @param maxcount maximum number of matches allowed
static int regrepeat(uint8_t *p, int64_t maxcount)
{
int64_t count = 0;
uint8_t *opnd;
int mask;
int testval = 0;
uint8_t *scan = rex.input; // Make local copy of rex.input for speed.
opnd = OPERAND(p);
switch (OP(p)) {
case ANY:
case ANY + ADD_NL:
while (count < maxcount) {
// Matching anything means we continue until end-of-line (or
// end-of-file for ANY + ADD_NL), only limited by maxcount.
while (*scan != NUL && count < maxcount) {
count++;
MB_PTR_ADV(scan);
}
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr || count == maxcount) {
break;
}
count++; // count the line-break
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
}
break;
case IDENT:
case IDENT + ADD_NL:
testval = 1;
FALLTHROUGH;
case SIDENT:
case SIDENT + ADD_NL:
while (count < maxcount) {
if (vim_isIDc(utf_ptr2char((char *)scan)) && (testval || !ascii_isdigit(*scan))) {
MB_PTR_ADV(scan);
} else if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else {
break;
}
count++;
}
break;
case KWORD:
case KWORD + ADD_NL:
testval = 1;
FALLTHROUGH;
case SKWORD:
case SKWORD + ADD_NL:
while (count < maxcount) {
if (vim_iswordp_buf((char *)scan, rex.reg_buf)
&& (testval || !ascii_isdigit(*scan))) {
MB_PTR_ADV(scan);
} else if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else {
break;
}
count++;
}
break;
case FNAME:
case FNAME + ADD_NL:
testval = 1;
FALLTHROUGH;
case SFNAME:
case SFNAME + ADD_NL:
while (count < maxcount) {
if (vim_isfilec(utf_ptr2char((char *)scan)) && (testval || !ascii_isdigit(*scan))) {
MB_PTR_ADV(scan);
} else if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else {
break;
}
count++;
}
break;
case PRINT:
case PRINT + ADD_NL:
testval = 1;
FALLTHROUGH;
case SPRINT:
case SPRINT + ADD_NL:
while (count < maxcount) {
if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if (vim_isprintc(utf_ptr2char((char *)scan)) == 1
&& (testval || !ascii_isdigit(*scan))) {
MB_PTR_ADV(scan);
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else {
break;
}
count++;
}
break;
case WHITE:
case WHITE + ADD_NL:
testval = mask = RI_WHITE;
do_class:
while (count < maxcount) {
int l;
if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if ((l = utfc_ptr2len((char *)scan)) > 1) {
if (testval != 0) {
break;
}
scan += l;
} else if ((class_tab[*scan] & mask) == testval) {
scan++;
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else {
break;
}
count++;
}
break;
case NWHITE:
case NWHITE + ADD_NL:
mask = RI_WHITE;
goto do_class;
case DIGIT:
case DIGIT + ADD_NL:
testval = mask = RI_DIGIT;
goto do_class;
case NDIGIT:
case NDIGIT + ADD_NL:
mask = RI_DIGIT;
goto do_class;
case HEX:
case HEX + ADD_NL:
testval = mask = RI_HEX;
goto do_class;
case NHEX:
case NHEX + ADD_NL:
mask = RI_HEX;
goto do_class;
case OCTAL:
case OCTAL + ADD_NL:
testval = mask = RI_OCTAL;
goto do_class;
case NOCTAL:
case NOCTAL + ADD_NL:
mask = RI_OCTAL;
goto do_class;
case WORD:
case WORD + ADD_NL:
testval = mask = RI_WORD;
goto do_class;
case NWORD:
case NWORD + ADD_NL:
mask = RI_WORD;
goto do_class;
case HEAD:
case HEAD + ADD_NL:
testval = mask = RI_HEAD;
goto do_class;
case NHEAD:
case NHEAD + ADD_NL:
mask = RI_HEAD;
goto do_class;
case ALPHA:
case ALPHA + ADD_NL:
testval = mask = RI_ALPHA;
goto do_class;
case NALPHA:
case NALPHA + ADD_NL:
mask = RI_ALPHA;
goto do_class;
case LOWER:
case LOWER + ADD_NL:
testval = mask = RI_LOWER;
goto do_class;
case NLOWER:
case NLOWER + ADD_NL:
mask = RI_LOWER;
goto do_class;
case UPPER:
case UPPER + ADD_NL:
testval = mask = RI_UPPER;
goto do_class;
case NUPPER:
case NUPPER + ADD_NL:
mask = RI_UPPER;
goto do_class;
case EXACTLY: {
int cu, cl;
// This doesn't do a multi-byte character, because a MULTIBYTECODE
// would have been used for it. It does handle single-byte
// characters, such as latin1.
if (rex.reg_ic) {
cu = mb_toupper(*opnd);
cl = mb_tolower(*opnd);
while (count < maxcount && (*scan == cu || *scan == cl)) {
count++;
scan++;
}
} else {
cu = *opnd;
while (count < maxcount && *scan == cu) {
count++;
scan++;
}
}
break;
}
case MULTIBYTECODE: {
int i, len, cf = 0;
// Safety check (just in case 'encoding' was changed since
// compiling the program).
if ((len = utfc_ptr2len((char *)opnd)) > 1) {
if (rex.reg_ic) {
cf = utf_fold(utf_ptr2char((char *)opnd));
}
while (count < maxcount && utfc_ptr2len((char *)scan) >= len) {
for (i = 0; i < len; i++) {
if (opnd[i] != scan[i]) {
break;
}
}
if (i < len && (!rex.reg_ic
|| utf_fold(utf_ptr2char((char *)scan)) != cf)) {
break;
}
scan += len;
count++;
}
}
}
break;
case ANYOF:
case ANYOF + ADD_NL:
testval = 1;
FALLTHROUGH;
case ANYBUT:
case ANYBUT + ADD_NL:
while (count < maxcount) {
int len;
if (*scan == NUL) {
if (!REG_MULTI || !WITH_NL(OP(p)) || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) {
break;
}
reg_nextline();
scan = rex.input;
if (got_int) {
break;
}
} else if (rex.reg_line_lbr && *scan == '\n' && WITH_NL(OP(p))) {
scan++;
} else if ((len = utfc_ptr2len((char *)scan)) > 1) {
if ((cstrchr((char *)opnd, utf_ptr2char((char *)scan)) == NULL) == testval) {
break;
}
scan += len;
} else {
if ((cstrchr((char *)opnd, *scan) == NULL) == testval) {
break;
}
scan++;
}
count++;
}
break;
case NEWL:
while (count < maxcount
&& ((*scan == NUL && rex.lnum <= rex.reg_maxline && !rex.reg_line_lbr
&& REG_MULTI) || (*scan == '\n' && rex.reg_line_lbr))) {
count++;
if (rex.reg_line_lbr) {
ADVANCE_REGINPUT();
} else {
reg_nextline();
}
scan = rex.input;
if (got_int) {
break;
}
}
break;
default: // Oh dear. Called inappropriately.
iemsg(_(e_re_corr));
#ifdef REGEXP_DEBUG
printf("Called regrepeat with op code %d\n", OP(p));
#endif
break;
}
rex.input = scan;
return (int)count;
}
// Push an item onto the regstack.
// Returns pointer to new item. Returns NULL when out of memory.
static regitem_T *regstack_push(regstate_T state, uint8_t *scan)
{
regitem_T *rp;
if ((int64_t)((unsigned)regstack.ga_len >> 10) >= p_mmp) {
emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
return NULL;
}
ga_grow(&regstack, sizeof(regitem_T));
rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len);
rp->rs_state = state;
rp->rs_scan = scan;
regstack.ga_len += (int)sizeof(regitem_T);
return rp;
}
// Pop an item from the regstack.
static void regstack_pop(uint8_t **scan)
{
regitem_T *rp;
rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len) - 1;
*scan = rp->rs_scan;
regstack.ga_len -= (int)sizeof(regitem_T);
}
// Save the current subexpr to "bp", so that they can be restored
// later by restore_subexpr().
static void save_subexpr(regbehind_T *bp)
FUNC_ATTR_NONNULL_ALL
{
// When "rex.need_clear_subexpr" is set we don't need to save the values, only
// remember that this flag needs to be set again when restoring.
bp->save_need_clear_subexpr = rex.need_clear_subexpr;
if (rex.need_clear_subexpr) {
return;
}
for (int i = 0; i < NSUBEXP; i++) {
if (REG_MULTI) {
bp->save_start[i].se_u.pos = rex.reg_startpos[i];
bp->save_end[i].se_u.pos = rex.reg_endpos[i];
} else {
bp->save_start[i].se_u.ptr = rex.reg_startp[i];
bp->save_end[i].se_u.ptr = rex.reg_endp[i];
}
}
}
// Restore the subexpr from "bp".
static void restore_subexpr(regbehind_T *bp)
FUNC_ATTR_NONNULL_ALL
{
// Only need to restore saved values when they are not to be cleared.
rex.need_clear_subexpr = bp->save_need_clear_subexpr;
if (rex.need_clear_subexpr) {
return;
}
for (int i = 0; i < NSUBEXP; i++) {
if (REG_MULTI) {
rex.reg_startpos[i] = bp->save_start[i].se_u.pos;
rex.reg_endpos[i] = bp->save_end[i].se_u.pos;
} else {
rex.reg_startp[i] = bp->save_start[i].se_u.ptr;
rex.reg_endp[i] = bp->save_end[i].se_u.ptr;
}
}
}
/// Main matching routine
///
/// Conceptually the strategy is simple: Check to see whether the current node
/// matches, push an item onto the regstack and loop to see whether the rest
/// matches, and then act accordingly. In practice we make some effort to
/// avoid using the regstack, in particular by going through "ordinary" nodes
/// (that don't need to know whether the rest of the match failed) by a nested
/// loop.
///
/// @param scan Current node.
/// @param tm timeout limit or NULL
/// @param timed_out flag set on timeout or NULL
///
/// @return - true when there is a match. Leaves rex.input and rex.lnum
/// just after the last matched character.
/// - false when there is no match. Leaves rex.input and rex.lnum in an
/// undefined state!
static bool regmatch(uint8_t *scan, const proftime_T *tm, int *timed_out)
{
uint8_t *next; // Next node.
int op;
int c;
regitem_T *rp;
int no;
int status; // one of the RA_ values:
int tm_count = 0;
// Make "regstack" and "backpos" empty. They are allocated and freed in
// bt_regexec_both() to reduce malloc()/free() calls.
regstack.ga_len = 0;
backpos.ga_len = 0;
// Repeat until "regstack" is empty.
while (true) {
// Some patterns may take a long time to match, e.g., "\([a-z]\+\)\+Q".
// Allow interrupting them with CTRL-C.
reg_breakcheck();
#ifdef REGEXP_DEBUG
if (scan != NULL && regnarrate) {
fprintf(stderr, "%s", (char *)regprop(scan));
fprintf(stderr, "%s", "(\n");
}
#endif
// Repeat for items that can be matched sequentially, without using the
// regstack.
while (true) {
if (got_int || scan == NULL) {
status = RA_FAIL;
break;
}
// Check for timeout once in a 100 times to avoid overhead.
if (tm != NULL && ++tm_count == 100) {
tm_count = 0;
if (profile_passed_limit(*tm)) {
if (timed_out != NULL) {
*timed_out = true;
}
status = RA_FAIL;
break;
}
}
status = RA_CONT;
#ifdef REGEXP_DEBUG
if (regnarrate) {
fprintf(stderr, "%s", (char *)regprop(scan));
fprintf(stderr, "%s", "...\n");
if (re_extmatch_in != NULL) {
int i;
fprintf(stderr, _("External submatches:\n"));
for (i = 0; i < NSUBEXP; i++) {
fprintf(stderr, "%s", " \"");
if (re_extmatch_in->matches[i] != NULL) {
fprintf(stderr, "%s", (char *)re_extmatch_in->matches[i]);
}
fprintf(stderr, "%s", "\"\n");
}
}
}
#endif
next = regnext(scan);
op = OP(scan);
// Check for character class with NL added.
if (!rex.reg_line_lbr && WITH_NL(op) && REG_MULTI
&& *rex.input == NUL && rex.lnum <= rex.reg_maxline) {
reg_nextline();
} else if (rex.reg_line_lbr && WITH_NL(op) && *rex.input == '\n') {
ADVANCE_REGINPUT();
} else {
if (WITH_NL(op)) {
op -= ADD_NL;
}
c = utf_ptr2char((char *)rex.input);
switch (op) {
case BOL:
if (rex.input != rex.line) {
status = RA_NOMATCH;
}
break;
case EOL:
if (c != NUL) {
status = RA_NOMATCH;
}
break;
case RE_BOF:
// We're not at the beginning of the file when below the first
// line where we started, not at the start of the line or we
// didn't start at the first line of the buffer.
if (rex.lnum != 0 || rex.input != rex.line
|| (REG_MULTI && rex.reg_firstlnum > 1)) {
status = RA_NOMATCH;
}
break;
case RE_EOF:
if (rex.lnum != rex.reg_maxline || c != NUL) {
status = RA_NOMATCH;
}
break;
case CURSOR:
// Check if the buffer is in a window and compare the
// rex.reg_win->w_cursor position to the match position.
if (rex.reg_win == NULL
|| (rex.lnum + rex.reg_firstlnum != rex.reg_win->w_cursor.lnum)
|| ((colnr_T)(rex.input - rex.line) !=
rex.reg_win->w_cursor.col)) {
status = RA_NOMATCH;
}
break;
case RE_MARK:
// Compare the mark position to the match position.
{
int mark = OPERAND(scan)[0];
int cmp = OPERAND(scan)[1];
pos_T *pos;
size_t col = REG_MULTI ? (size_t)(rex.input - rex.line) : 0;
fmark_T *fm = mark_get(rex.reg_buf, curwin, NULL, kMarkBufLocal, mark);
// Line may have been freed, get it again.
if (REG_MULTI) {
rex.line = (uint8_t *)reg_getline(rex.lnum);
rex.input = rex.line + col;
}
if (fm == NULL // mark doesn't exist
|| fm->mark.lnum <= 0) { // mark isn't set in reg_buf
status = RA_NOMATCH;
} else {
pos = &fm->mark;
const colnr_T pos_col = pos->lnum == rex.lnum + rex.reg_firstlnum
&& pos->col == MAXCOL
? (colnr_T)strlen(reg_getline(pos->lnum - rex.reg_firstlnum))
: pos->col;
if (pos->lnum == rex.lnum + rex.reg_firstlnum
? (pos_col == (colnr_T)(rex.input - rex.line)
? (cmp == '<' || cmp == '>')
: (pos_col < (colnr_T)(rex.input - rex.line)
? cmp != '>'
: cmp != '<'))
: (pos->lnum < rex.lnum + rex.reg_firstlnum
? cmp != '>'
: cmp != '<')) {
status = RA_NOMATCH;
}
}
}
break;
case RE_VISUAL:
if (!reg_match_visual()) {
status = RA_NOMATCH;
}
break;
case RE_LNUM:
assert(rex.lnum + rex.reg_firstlnum >= 0
&& (uintmax_t)(rex.lnum + rex.reg_firstlnum) <= UINT32_MAX);
if (!REG_MULTI
|| !re_num_cmp((uint32_t)(rex.lnum + rex.reg_firstlnum), scan)) {
status = RA_NOMATCH;
}
break;
case RE_COL:
assert(rex.input - rex.line + 1 >= 0
&& (uintmax_t)(rex.input - rex.line + 1) <= UINT32_MAX);
if (!re_num_cmp((uint32_t)(rex.input - rex.line + 1), scan)) {
status = RA_NOMATCH;
}
break;
case RE_VCOL:
if (!re_num_cmp((unsigned)win_linetabsize(rex.reg_win == NULL ? curwin : rex.reg_win,
rex.reg_firstlnum + rex.lnum,
(char *)rex.line,
(colnr_T)(rex.input - rex.line)) + 1,
scan)) {
status = RA_NOMATCH;
}
break;
case BOW: // \<word; rex.input points to w
if (c == NUL) { // Can't match at end of line
status = RA_NOMATCH;
} else {
// Get class of current and previous char (if it exists).
const int this_class =
mb_get_class_tab((char *)rex.input, rex.reg_buf->b_chartab);
if (this_class <= 1) {
status = RA_NOMATCH; // Not on a word at all.
} else if (reg_prev_class() == this_class) {
status = RA_NOMATCH; // Previous char is in same word.
}
}
break;
case EOW: // word\>; rex.input points after d
if (rex.input == rex.line) { // Can't match at start of line
status = RA_NOMATCH;
} else {
int this_class, prev_class;
// Get class of current and previous char (if it exists).
this_class = mb_get_class_tab((char *)rex.input, rex.reg_buf->b_chartab);
prev_class = reg_prev_class();
if (this_class == prev_class
|| prev_class == 0 || prev_class == 1) {
status = RA_NOMATCH;
}
}
break; // Matched with EOW
case ANY:
// ANY does not match new lines.
if (c == NUL) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case IDENT:
if (!vim_isIDc(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case SIDENT:
if (ascii_isdigit(*rex.input) || !vim_isIDc(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case KWORD:
if (!vim_iswordp_buf((char *)rex.input, rex.reg_buf)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case SKWORD:
if (ascii_isdigit(*rex.input)
|| !vim_iswordp_buf((char *)rex.input, rex.reg_buf)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case FNAME:
if (!vim_isfilec(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case SFNAME:
if (ascii_isdigit(*rex.input) || !vim_isfilec(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case PRINT:
if (!vim_isprintc(utf_ptr2char((char *)rex.input))) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case SPRINT:
if (ascii_isdigit(*rex.input) || !vim_isprintc(utf_ptr2char((char *)rex.input))) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case WHITE:
if (!ascii_iswhite(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NWHITE:
if (c == NUL || ascii_iswhite(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case DIGIT:
if (!ri_digit(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NDIGIT:
if (c == NUL || ri_digit(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case HEX:
if (!ri_hex(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NHEX:
if (c == NUL || ri_hex(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case OCTAL:
if (!ri_octal(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NOCTAL:
if (c == NUL || ri_octal(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case WORD:
if (!ri_word(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NWORD:
if (c == NUL || ri_word(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case HEAD:
if (!ri_head(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NHEAD:
if (c == NUL || ri_head(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case ALPHA:
if (!ri_alpha(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NALPHA:
if (c == NUL || ri_alpha(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case LOWER:
if (!ri_lower(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NLOWER:
if (c == NUL || ri_lower(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case UPPER:
if (!ri_upper(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case NUPPER:
if (c == NUL || ri_upper(c)) {
status = RA_NOMATCH;
} else {
ADVANCE_REGINPUT();
}
break;
case EXACTLY: {
int len;
uint8_t *opnd;
opnd = OPERAND(scan);
// Inline the first byte, for speed.
if (*opnd != *rex.input
&& (!rex.reg_ic)) {
status = RA_NOMATCH;
} else if (*opnd == NUL) {
// match empty string always works; happens when "~" is
// empty.
} else {
if (opnd[1] == NUL && !rex.reg_ic) {
len = 1; // matched a single byte above
} else {
// Need to match first byte again for multi-byte.
len = (int)strlen((char *)opnd);
if (cstrncmp((char *)opnd, (char *)rex.input, &len) != 0) {
status = RA_NOMATCH;
}
}
// Check for following composing character, unless %C
// follows (skips over all composing chars).
if (status != RA_NOMATCH
&& utf_composinglike((char *)rex.input, (char *)rex.input + len)
&& !rex.reg_icombine
&& OP(next) != RE_COMPOSING) {
// raaron: This code makes a composing character get
// ignored, which is the correct behavior (sometimes)
// for voweled Hebrew texts.
status = RA_NOMATCH;
}
if (status != RA_NOMATCH) {
rex.input += len;
}
}
}
break;
case ANYOF:
case ANYBUT: {
uint8_t *q = OPERAND(scan);
if (c == NUL) {
status = RA_NOMATCH;
} else if ((cstrchr((char *)q, c) == NULL) == (op == ANYOF)) {
status = RA_NOMATCH;
} else { // Check following combining characters
int len = utfc_ptr2len((char *)q) - utf_ptr2len((char *)q);
rex.input += utf_ptr2len((char *)rex.input);
q += utf_ptr2len((char *)q);
if (len == 0) {
break;
}
for (int i = 0; i < len; i++) {
if (q[i] != rex.input[i]) {
status = RA_NOMATCH;
break;
}
}
rex.input += len;
}
break;
}
case MULTIBYTECODE: {
int i, len;
const uint8_t *opnd = OPERAND(scan);
// Safety check (just in case 'encoding' was changed since
// compiling the program).
if ((len = utfc_ptr2len((char *)opnd)) < 2) {
status = RA_NOMATCH;
break;
}
const int opndc = utf_ptr2char((char *)opnd);
if (utf_iscomposing(opndc)) {
// When only a composing char is given match at any
// position where that composing char appears.
status = RA_NOMATCH;
for (i = 0; rex.input[i] != NUL;
i += utf_ptr2len((char *)rex.input + i)) {
const int inpc = utf_ptr2char((char *)rex.input + i);
if (!utf_iscomposing(inpc)) {
if (i > 0) {
break;
}
} else if (opndc == inpc) {
// Include all following composing chars.
len = i + utfc_ptr2len((char *)rex.input + i);
status = RA_MATCH;
break;
}
}
} else {
for (i = 0; i < len; i++) {
if (opnd[i] != rex.input[i]) {
status = RA_NOMATCH;
break;
}
}
}
rex.input += len;
}
break;
case RE_COMPOSING:
// Skip composing characters.
while (utf_iscomposing(utf_ptr2char((char *)rex.input))) {
rex.input += utf_ptr2len((char *)rex.input);
}
break;
case NOTHING:
break;
case BACK: {
int i;
// When we run into BACK we need to check if we don't keep
// looping without matching any input. The second and later
// times a BACK is encountered it fails if the input is still
// at the same position as the previous time.
// The positions are stored in "backpos" and found by the
// current value of "scan", the position in the RE program.
backpos_T *bp = (backpos_T *)backpos.ga_data;
for (i = 0; i < backpos.ga_len; i++) {
if (bp[i].bp_scan == scan) {
break;
}
}
if (i == backpos.ga_len) {
backpos_T *p = GA_APPEND_VIA_PTR(backpos_T, &backpos);
p->bp_scan = scan;
} else if (reg_save_equal(&bp[i].bp_pos)) {
// Still at same position as last time, fail.
status = RA_NOMATCH;
}
assert(status != RA_FAIL);
if (status != RA_NOMATCH) {
reg_save(&bp[i].bp_pos, &backpos);
}
}
break;
case MOPEN + 0: // Match start: \zs
case MOPEN + 1: // \(
case MOPEN + 2:
case MOPEN + 3:
case MOPEN + 4:
case MOPEN + 5:
case MOPEN + 6:
case MOPEN + 7:
case MOPEN + 8:
case MOPEN + 9:
no = op - MOPEN;
cleanup_subexpr();
rp = regstack_push(RS_MOPEN, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
save_se(&rp->rs_un.sesave, &rex.reg_startpos[no],
&rex.reg_startp[no]);
// We simply continue and handle the result when done.
}
break;
case NOPEN: // \%(
case NCLOSE: // \) after \%(
if (regstack_push(RS_NOPEN, scan) == NULL) {
status = RA_FAIL;
}
// We simply continue and handle the result when done.
break;
case ZOPEN + 1:
case ZOPEN + 2:
case ZOPEN + 3:
case ZOPEN + 4:
case ZOPEN + 5:
case ZOPEN + 6:
case ZOPEN + 7:
case ZOPEN + 8:
case ZOPEN + 9:
no = op - ZOPEN;
cleanup_zsubexpr();
rp = regstack_push(RS_ZOPEN, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
save_se(&rp->rs_un.sesave, &reg_startzpos[no],
&reg_startzp[no]);
// We simply continue and handle the result when done.
}
break;
case MCLOSE + 0: // Match end: \ze
case MCLOSE + 1: // \)
case MCLOSE + 2:
case MCLOSE + 3:
case MCLOSE + 4:
case MCLOSE + 5:
case MCLOSE + 6:
case MCLOSE + 7:
case MCLOSE + 8:
case MCLOSE + 9:
no = op - MCLOSE;
cleanup_subexpr();
rp = regstack_push(RS_MCLOSE, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
save_se(&rp->rs_un.sesave, &rex.reg_endpos[no], &rex.reg_endp[no]);
// We simply continue and handle the result when done.
}
break;
case ZCLOSE + 1: // \) after \z(
case ZCLOSE + 2:
case ZCLOSE + 3:
case ZCLOSE + 4:
case ZCLOSE + 5:
case ZCLOSE + 6:
case ZCLOSE + 7:
case ZCLOSE + 8:
case ZCLOSE + 9:
no = op - ZCLOSE;
cleanup_zsubexpr();
rp = regstack_push(RS_ZCLOSE, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
save_se(&rp->rs_un.sesave, &reg_endzpos[no],
&reg_endzp[no]);
// We simply continue and handle the result when done.
}
break;
case BACKREF + 1:
case BACKREF + 2:
case BACKREF + 3:
case BACKREF + 4:
case BACKREF + 5:
case BACKREF + 6:
case BACKREF + 7:
case BACKREF + 8:
case BACKREF + 9: {
int len;
no = op - BACKREF;
cleanup_subexpr();
if (!REG_MULTI) { // Single-line regexp
if (rex.reg_startp[no] == NULL || rex.reg_endp[no] == NULL) {
// Backref was not set: Match an empty string.
len = 0;
} else {
// Compare current input with back-ref in the same line.
len = (int)(rex.reg_endp[no] - rex.reg_startp[no]);
if (cstrncmp((char *)rex.reg_startp[no], (char *)rex.input, &len) != 0) {
status = RA_NOMATCH;
}
}
} else { // Multi-line regexp
if (rex.reg_startpos[no].lnum < 0 || rex.reg_endpos[no].lnum < 0) {
// Backref was not set: Match an empty string.
len = 0;
} else {
if (rex.reg_startpos[no].lnum == rex.lnum
&& rex.reg_endpos[no].lnum == rex.lnum) {
// Compare back-ref within the current line.
len = rex.reg_endpos[no].col - rex.reg_startpos[no].col;
if (cstrncmp((char *)rex.line + rex.reg_startpos[no].col,
(char *)rex.input, &len) != 0) {
status = RA_NOMATCH;
}
} else {
// Messy situation: Need to compare between two lines.
int r = match_with_backref(rex.reg_startpos[no].lnum,
rex.reg_startpos[no].col,
rex.reg_endpos[no].lnum,
rex.reg_endpos[no].col,
&len);
if (r != RA_MATCH) {
status = r;
}
}
}
}
// Matched the backref, skip over it.
rex.input += len;
}
break;
case ZREF + 1:
case ZREF + 2:
case ZREF + 3:
case ZREF + 4:
case ZREF + 5:
case ZREF + 6:
case ZREF + 7:
case ZREF + 8:
case ZREF + 9:
cleanup_zsubexpr();
no = op - ZREF;
if (re_extmatch_in != NULL
&& re_extmatch_in->matches[no] != NULL) {
int len = (int)strlen((char *)re_extmatch_in->matches[no]);
if (cstrncmp((char *)re_extmatch_in->matches[no], (char *)rex.input, &len) != 0) {
status = RA_NOMATCH;
} else {
rex.input += len;
}
} else {
// Backref was not set: Match an empty string.
}
break;
case BRANCH:
if (OP(next) != BRANCH) { // No choice.
next = OPERAND(scan); // Avoid recursion.
} else {
rp = regstack_push(RS_BRANCH, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
status = RA_BREAK; // rest is below
}
}
break;
case BRACE_LIMITS:
if (OP(next) == BRACE_SIMPLE) {
bl_minval = OPERAND_MIN(scan);
bl_maxval = OPERAND_MAX(scan);
} else if (OP(next) >= BRACE_COMPLEX
&& OP(next) < BRACE_COMPLEX + 10) {
no = OP(next) - BRACE_COMPLEX;
brace_min[no] = OPERAND_MIN(scan);
brace_max[no] = OPERAND_MAX(scan);
brace_count[no] = 0;
} else {
internal_error("BRACE_LIMITS");
status = RA_FAIL;
}
break;
case BRACE_COMPLEX + 0:
case BRACE_COMPLEX + 1:
case BRACE_COMPLEX + 2:
case BRACE_COMPLEX + 3:
case BRACE_COMPLEX + 4:
case BRACE_COMPLEX + 5:
case BRACE_COMPLEX + 6:
case BRACE_COMPLEX + 7:
case BRACE_COMPLEX + 8:
case BRACE_COMPLEX + 9:
no = op - BRACE_COMPLEX;
brace_count[no]++;
// If not matched enough times yet, try one more
if (brace_count[no] <= (brace_min[no] <= brace_max[no]
? brace_min[no] : brace_max[no])) {
rp = regstack_push(RS_BRCPLX_MORE, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
reg_save(&rp->rs_un.regsave, &backpos);
next = OPERAND(scan);
// We continue and handle the result when done.
}
break;
}
// If matched enough times, may try matching some more
if (brace_min[no] <= brace_max[no]) {
// Range is the normal way around, use longest match
if (brace_count[no] <= brace_max[no]) {
rp = regstack_push(RS_BRCPLX_LONG, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)no;
reg_save(&rp->rs_un.regsave, &backpos);
next = OPERAND(scan);
// We continue and handle the result when done.
}
}
} else {
// Range is backwards, use shortest match first
if (brace_count[no] <= brace_min[no]) {
rp = regstack_push(RS_BRCPLX_SHORT, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
reg_save(&rp->rs_un.regsave, &backpos);
// We continue and handle the result when done.
}
}
}
break;
case BRACE_SIMPLE:
case STAR:
case PLUS: {
regstar_T rst;
// Lookahead to avoid useless match attempts when we know
// what character comes next.
if (OP(next) == EXACTLY) {
rst.nextb = *OPERAND(next);
if (rex.reg_ic) {
if (mb_isupper(rst.nextb)) {
rst.nextb_ic = mb_tolower(rst.nextb);
} else {
rst.nextb_ic = mb_toupper(rst.nextb);
}
} else {
rst.nextb_ic = rst.nextb;
}
} else {
rst.nextb = NUL;
rst.nextb_ic = NUL;
}
if (op != BRACE_SIMPLE) {
rst.minval = (op == STAR) ? 0 : 1;
rst.maxval = MAX_LIMIT;
} else {
rst.minval = bl_minval;
rst.maxval = bl_maxval;
}
// When maxval > minval, try matching as much as possible, up
// to maxval. When maxval < minval, try matching at least the
// minimal number (since the range is backwards, that's also
// maxval!).
rst.count = regrepeat(OPERAND(scan), rst.maxval);
if (got_int) {
status = RA_FAIL;
break;
}
if (rst.minval <= rst.maxval
? rst.count >= rst.minval : rst.count >= rst.maxval) {
// It could match. Prepare for trying to match what
// follows. The code is below. Parameters are stored in
// a regstar_T on the regstack.
if ((int64_t)((unsigned)regstack.ga_len >> 10) >= p_mmp) {
emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
status = RA_FAIL;
} else {
ga_grow(&regstack, sizeof(regstar_T));
regstack.ga_len += (int)sizeof(regstar_T);
rp = regstack_push(rst.minval <= rst.maxval ? RS_STAR_LONG : RS_STAR_SHORT, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
*(((regstar_T *)rp) - 1) = rst;
status = RA_BREAK; // skip the restore bits
}
}
} else {
status = RA_NOMATCH;
}
}
break;
case NOMATCH:
case MATCH:
case SUBPAT:
rp = regstack_push(RS_NOMATCH, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
rp->rs_no = (int16_t)op;
reg_save(&rp->rs_un.regsave, &backpos);
next = OPERAND(scan);
// We continue and handle the result when done.
}
break;
case BEHIND:
case NOBEHIND:
// Need a bit of room to store extra positions.
if ((int64_t)((unsigned)regstack.ga_len >> 10) >= p_mmp) {
emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
status = RA_FAIL;
} else {
ga_grow(&regstack, sizeof(regbehind_T));
regstack.ga_len += (int)sizeof(regbehind_T);
rp = regstack_push(RS_BEHIND1, scan);
if (rp == NULL) {
status = RA_FAIL;
} else {
// Need to save the subexpr to be able to restore them
// when there is a match but we don't use it.
save_subexpr(((regbehind_T *)rp) - 1);
rp->rs_no = (int16_t)op;
reg_save(&rp->rs_un.regsave, &backpos);
// First try if what follows matches. If it does then we
// check the behind match by looping.
}
}
break;
case BHPOS:
if (REG_MULTI) {
if (behind_pos.rs_u.pos.col != (colnr_T)(rex.input - rex.line)
|| behind_pos.rs_u.pos.lnum != rex.lnum) {
status = RA_NOMATCH;
}
} else if (behind_pos.rs_u.ptr != rex.input) {
status = RA_NOMATCH;
}
break;
case NEWL:
if ((c != NUL || !REG_MULTI || rex.lnum > rex.reg_maxline
|| rex.reg_line_lbr) && (c != '\n' || !rex.reg_line_lbr)) {
status = RA_NOMATCH;
} else if (rex.reg_line_lbr) {
ADVANCE_REGINPUT();
} else {
reg_nextline();
}
break;
case END:
status = RA_MATCH; // Success!
break;
default:
iemsg(_(e_re_corr));
#ifdef REGEXP_DEBUG
printf("Illegal op code %d\n", op);
#endif
status = RA_FAIL;
break;
}
}
// If we can't continue sequentially, break the inner loop.
if (status != RA_CONT) {
break;
}
// Continue in inner loop, advance to next item.
scan = next;
} // end of inner loop
// If there is something on the regstack execute the code for the state.
// If the state is popped then loop and use the older state.
while (!GA_EMPTY(&regstack) && status != RA_FAIL) {
rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len) - 1;
switch (rp->rs_state) {
case RS_NOPEN:
// Result is passed on as-is, simply pop the state.
regstack_pop(&scan);
break;
case RS_MOPEN:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
restore_se(&rp->rs_un.sesave, &rex.reg_startpos[rp->rs_no],
&rex.reg_startp[rp->rs_no]);
}
regstack_pop(&scan);
break;
case RS_ZOPEN:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
restore_se(&rp->rs_un.sesave, &reg_startzpos[rp->rs_no],
&reg_startzp[rp->rs_no]);
}
regstack_pop(&scan);
break;
case RS_MCLOSE:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
restore_se(&rp->rs_un.sesave, &rex.reg_endpos[rp->rs_no],
&rex.reg_endp[rp->rs_no]);
}
regstack_pop(&scan);
break;
case RS_ZCLOSE:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
restore_se(&rp->rs_un.sesave, &reg_endzpos[rp->rs_no],
&reg_endzp[rp->rs_no]);
}
regstack_pop(&scan);
break;
case RS_BRANCH:
if (status == RA_MATCH) {
// this branch matched, use it
regstack_pop(&scan);
} else {
if (status != RA_BREAK) {
// After a non-matching branch: try next one.
reg_restore(&rp->rs_un.regsave, &backpos);
scan = rp->rs_scan;
}
if (scan == NULL || OP(scan) != BRANCH) {
// no more branches, didn't find a match
status = RA_NOMATCH;
regstack_pop(&scan);
} else {
// Prepare to try a branch.
rp->rs_scan = regnext(scan);
reg_save(&rp->rs_un.regsave, &backpos);
scan = OPERAND(scan);
}
}
break;
case RS_BRCPLX_MORE:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
reg_restore(&rp->rs_un.regsave, &backpos);
brace_count[rp->rs_no]--; // decrement match count
}
regstack_pop(&scan);
break;
case RS_BRCPLX_LONG:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
// There was no match, but we did find enough matches.
reg_restore(&rp->rs_un.regsave, &backpos);
brace_count[rp->rs_no]--;
// continue with the items after "\{}"
status = RA_CONT;
}
regstack_pop(&scan);
if (status == RA_CONT) {
scan = regnext(scan);
}
break;
case RS_BRCPLX_SHORT:
// Pop the state. Restore pointers when there is no match.
if (status == RA_NOMATCH) {
// There was no match, try to match one more item.
reg_restore(&rp->rs_un.regsave, &backpos);
}
regstack_pop(&scan);
if (status == RA_NOMATCH) {
scan = OPERAND(scan);
status = RA_CONT;
}
break;
case RS_NOMATCH:
// Pop the state. If the operand matches for NOMATCH or
// doesn't match for MATCH/SUBPAT, we fail. Otherwise backup,
// except for SUBPAT, and continue with the next item.
if (status == (rp->rs_no == NOMATCH ? RA_MATCH : RA_NOMATCH)) {
status = RA_NOMATCH;
} else {
status = RA_CONT;
if (rp->rs_no != SUBPAT) { // zero-width
reg_restore(&rp->rs_un.regsave, &backpos);
}
}
regstack_pop(&scan);
if (status == RA_CONT) {
scan = regnext(scan);
}
break;
case RS_BEHIND1:
if (status == RA_NOMATCH) {
regstack_pop(&scan);
regstack.ga_len -= (int)sizeof(regbehind_T);
} else {
// The stuff after BEHIND/NOBEHIND matches. Now try if
// the behind part does (not) match before the current
// position in the input. This must be done at every
// position in the input and checking if the match ends at
// the current position.
// save the position after the found match for next
reg_save(&(((regbehind_T *)rp) - 1)->save_after, &backpos);
// Start looking for a match with operand at the current
// position. Go back one character until we find the
// result, hitting the start of the line or the previous
// line (for multi-line matching).
// Set behind_pos to where the match should end, BHPOS
// will match it. Save the current value.
(((regbehind_T *)rp) - 1)->save_behind = behind_pos;
behind_pos = rp->rs_un.regsave;
rp->rs_state = RS_BEHIND2;
reg_restore(&rp->rs_un.regsave, &backpos);
scan = OPERAND(rp->rs_scan) + 4;
}
break;
case RS_BEHIND2:
// Looping for BEHIND / NOBEHIND match.
if (status == RA_MATCH && reg_save_equal(&behind_pos)) {
// found a match that ends where "next" started
behind_pos = (((regbehind_T *)rp) - 1)->save_behind;
if (rp->rs_no == BEHIND) {
reg_restore(&(((regbehind_T *)rp) - 1)->save_after,
&backpos);
} else {
// But we didn't want a match. Need to restore the
// subexpr, because what follows matched, so they have
// been set.
status = RA_NOMATCH;
restore_subexpr(((regbehind_T *)rp) - 1);
}
regstack_pop(&scan);
regstack.ga_len -= (int)sizeof(regbehind_T);
} else {
int64_t limit;
// No match or a match that doesn't end where we want it: Go
// back one character. May go to previous line once.
no = OK;
limit = OPERAND_MIN(rp->rs_scan);
if (REG_MULTI) {
if (limit > 0
&& ((rp->rs_un.regsave.rs_u.pos.lnum
< behind_pos.rs_u.pos.lnum
? (colnr_T)strlen((char *)rex.line)
: behind_pos.rs_u.pos.col)
- rp->rs_un.regsave.rs_u.pos.col >= limit)) {
no = FAIL;
} else if (rp->rs_un.regsave.rs_u.pos.col == 0) {
if (rp->rs_un.regsave.rs_u.pos.lnum
< behind_pos.rs_u.pos.lnum
|| reg_getline(--rp->rs_un.regsave.rs_u.pos.lnum)
== NULL) {
no = FAIL;
} else {
reg_restore(&rp->rs_un.regsave, &backpos);
rp->rs_un.regsave.rs_u.pos.col =
(colnr_T)strlen((char *)rex.line);
}
} else {
const uint8_t *const line =
(uint8_t *)reg_getline(rp->rs_un.regsave.rs_u.pos.lnum);
rp->rs_un.regsave.rs_u.pos.col -=
utf_head_off((char *)line,
(char *)line + rp->rs_un.regsave.rs_u.pos.col - 1)
+ 1;
}
} else {
if (rp->rs_un.regsave.rs_u.ptr == rex.line) {
no = FAIL;
} else {
MB_PTR_BACK(rex.line, rp->rs_un.regsave.rs_u.ptr);
if (limit > 0
&& (behind_pos.rs_u.ptr - rp->rs_un.regsave.rs_u.ptr) > (ptrdiff_t)limit) {
no = FAIL;
}
}
}
if (no == OK) {
// Advanced, prepare for finding match again.
reg_restore(&rp->rs_un.regsave, &backpos);
scan = OPERAND(rp->rs_scan) + 4;
if (status == RA_MATCH) {
// We did match, so subexpr may have been changed,
// need to restore them for the next try.
status = RA_NOMATCH;
restore_subexpr(((regbehind_T *)rp) - 1);
}
} else {
// Can't advance. For NOBEHIND that's a match.
behind_pos = (((regbehind_T *)rp) - 1)->save_behind;
if (rp->rs_no == NOBEHIND) {
reg_restore(&(((regbehind_T *)rp) - 1)->save_after,
&backpos);
status = RA_MATCH;
} else {
// We do want a proper match. Need to restore the
// subexpr if we had a match, because they may have
// been set.
if (status == RA_MATCH) {
status = RA_NOMATCH;
restore_subexpr(((regbehind_T *)rp) - 1);
}
}
regstack_pop(&scan);
regstack.ga_len -= (int)sizeof(regbehind_T);
}
}
break;
case RS_STAR_LONG:
case RS_STAR_SHORT: {
regstar_T *rst = ((regstar_T *)rp) - 1;
if (status == RA_MATCH) {
regstack_pop(&scan);
regstack.ga_len -= (int)sizeof(regstar_T);
break;
}
// Tried once already, restore input pointers.
if (status != RA_BREAK) {
reg_restore(&rp->rs_un.regsave, &backpos);
}
// Repeat until we found a position where it could match.
while (true) {
if (status != RA_BREAK) {
// Tried first position already, advance.
if (rp->rs_state == RS_STAR_LONG) {
// Trying for longest match, but couldn't or
// didn't match -- back up one char.
if (--rst->count < rst->minval) {
break;
}
if (rex.input == rex.line) {
// backup to last char of previous line
if (rex.lnum == 0) {
status = RA_NOMATCH;
break;
}
rex.lnum--;
rex.line = (uint8_t *)reg_getline(rex.lnum);
// Just in case regrepeat() didn't count right.
if (rex.line == NULL) {
break;
}
rex.input = rex.line + strlen((char *)rex.line);
reg_breakcheck();
} else {
MB_PTR_BACK(rex.line, rex.input);
}
} else {
// Range is backwards, use shortest match first.
// Careful: maxval and minval are exchanged!
// Couldn't or didn't match: try advancing one
// char.
if (rst->count == rst->minval
|| regrepeat(OPERAND(rp->rs_scan), 1L) == 0) {
break;
}
rst->count++;
}
if (got_int) {
break;
}
} else {
status = RA_NOMATCH;
}
// If it could match, try it.
if (rst->nextb == NUL || *rex.input == rst->nextb
|| *rex.input == rst->nextb_ic) {
reg_save(&rp->rs_un.regsave, &backpos);
scan = regnext(rp->rs_scan);
status = RA_CONT;
break;
}
}
if (status != RA_CONT) {
// Failed.
regstack_pop(&scan);
regstack.ga_len -= (int)sizeof(regstar_T);
status = RA_NOMATCH;
}
}
break;
}
// If we want to continue the inner loop or didn't pop a state
// continue matching loop
if (status == RA_CONT || rp == (regitem_T *)
((char *)regstack.ga_data + regstack.ga_len) - 1) {
break;
}
}
// May need to continue with the inner loop, starting at "scan".
if (status == RA_CONT) {
continue;
}
// If the regstack is empty or something failed we are done.
if (GA_EMPTY(&regstack) || status == RA_FAIL) {
if (scan == NULL) {
// We get here only if there's trouble -- normally "case END" is
// the terminating point.
iemsg(_(e_re_corr));
#ifdef REGEXP_DEBUG
printf("Premature EOL\n");
#endif
}
return status == RA_MATCH;
}
} // End of loop until the regstack is empty.
// NOTREACHED
}
/// Try match of "prog" with at rex.line["col"].
///
/// @param tm timeout limit or NULL
/// @param timed_out flag set on timeout or NULL
///
/// @return 0 for failure, or number of lines contained in the match.
static int regtry(bt_regprog_T *prog, colnr_T col, proftime_T *tm, int *timed_out)
{
rex.input = rex.line + col;
rex.need_clear_subexpr = true;
// Clear the external match subpointers if necessaey.
rex.need_clear_zsubexpr = (prog->reghasz == REX_SET);
if (regmatch(prog->program + 1, tm, timed_out) == 0) {
return 0;
}
cleanup_subexpr();
if (REG_MULTI) {
if (rex.reg_startpos[0].lnum < 0) {
rex.reg_startpos[0].lnum = 0;
rex.reg_startpos[0].col = col;
}
if (rex.reg_endpos[0].lnum < 0) {
rex.reg_endpos[0].lnum = rex.lnum;
rex.reg_endpos[0].col = (int)(rex.input - rex.line);
} else {
// Use line number of "\ze".
rex.lnum = rex.reg_endpos[0].lnum;
}
} else {
if (rex.reg_startp[0] == NULL) {
rex.reg_startp[0] = rex.line + col;
}
if (rex.reg_endp[0] == NULL) {
rex.reg_endp[0] = rex.input;
}
}
// Package any found \z(...\) matches for export. Default is none.
unref_extmatch(re_extmatch_out);
re_extmatch_out = NULL;
if (prog->reghasz == REX_SET) {
int i;
cleanup_zsubexpr();
re_extmatch_out = make_extmatch();
for (i = 0; i < NSUBEXP; i++) {
if (REG_MULTI) {
// Only accept single line matches.
if (reg_startzpos[i].lnum >= 0
&& reg_endzpos[i].lnum == reg_startzpos[i].lnum
&& reg_endzpos[i].col >= reg_startzpos[i].col) {
re_extmatch_out->matches[i] =
(uint8_t *)xstrnsave(reg_getline(reg_startzpos[i].lnum) + reg_startzpos[i].col,
(size_t)(reg_endzpos[i].col - reg_startzpos[i].col));
}
} else {
if (reg_startzp[i] != NULL && reg_endzp[i] != NULL) {
re_extmatch_out->matches[i] =
(uint8_t *)xstrnsave((char *)reg_startzp[i], (size_t)(reg_endzp[i] - reg_startzp[i]));
}
}
}
}
return 1 + rex.lnum;
}
/// Match a regexp against a string ("line" points to the string) or multiple
/// lines (if "line" is NULL, use reg_getline()).
///
/// @param startcol column to start looking for match
/// @param tm timeout limit or NULL
/// @param timed_out flag set on timeout or NULL
///
/// @return 0 for failure, or number of lines contained in the match.
static int bt_regexec_both(uint8_t *line, colnr_T startcol, proftime_T *tm, int *timed_out)
{
bt_regprog_T *prog;
uint8_t *s;
colnr_T col = startcol;
int retval = 0;
// Create "regstack" and "backpos" if they are not allocated yet.
// We allocate *_INITIAL amount of bytes first and then set the grow size
// to much bigger value to avoid many malloc calls in case of deep regular
// expressions.
if (regstack.ga_data == NULL) {
// Use an item size of 1 byte, since we push different things
// onto the regstack.
ga_init(&regstack, 1, REGSTACK_INITIAL);
ga_grow(&regstack, REGSTACK_INITIAL);
ga_set_growsize(&regstack, REGSTACK_INITIAL * 8);
}
if (backpos.ga_data == NULL) {
ga_init(&backpos, sizeof(backpos_T), BACKPOS_INITIAL);
ga_grow(&backpos, BACKPOS_INITIAL);
ga_set_growsize(&backpos, BACKPOS_INITIAL * 8);
}
if (REG_MULTI) {
prog = (bt_regprog_T *)rex.reg_mmatch->regprog;
line = (uint8_t *)reg_getline(0);
rex.reg_startpos = rex.reg_mmatch->startpos;
rex.reg_endpos = rex.reg_mmatch->endpos;
} else {
prog = (bt_regprog_T *)rex.reg_match->regprog;
rex.reg_startp = (uint8_t **)rex.reg_match->startp;
rex.reg_endp = (uint8_t **)rex.reg_match->endp;
}
// Be paranoid...
if (prog == NULL || line == NULL) {
iemsg(_(e_null));
goto theend;
}
// Check validity of program.
if (prog_magic_wrong()) {
goto theend;
}
// If the start column is past the maximum column: no need to try.
if (rex.reg_maxcol > 0 && col >= rex.reg_maxcol) {
goto theend;
}
// If pattern contains "\c" or "\C": overrule value of rex.reg_ic
if (prog->regflags & RF_ICASE) {
rex.reg_ic = true;
} else if (prog->regflags & RF_NOICASE) {
rex.reg_ic = false;
}
// If pattern contains "\Z" overrule value of rex.reg_icombine
if (prog->regflags & RF_ICOMBINE) {
rex.reg_icombine = true;
}
// If there is a "must appear" string, look for it.
if (prog->regmust != NULL) {
int c = utf_ptr2char((char *)prog->regmust);
s = line + col;
// This is used very often, esp. for ":global". Use two versions of
// the loop to avoid overhead of conditions.
if (!rex.reg_ic) {
while ((s = (uint8_t *)vim_strchr((char *)s, c)) != NULL) {
if (cstrncmp((char *)s, (char *)prog->regmust, &prog->regmlen) == 0) {
break; // Found it.
}
MB_PTR_ADV(s);
}
} else {
while ((s = (uint8_t *)cstrchr((char *)s, c)) != NULL) {
if (cstrncmp((char *)s, (char *)prog->regmust, &prog->regmlen) == 0) {
break; // Found it.
}
MB_PTR_ADV(s);
}
}
if (s == NULL) { // Not present.
goto theend;
}
}
rex.line = line;
rex.lnum = 0;
reg_toolong = false;
// Simplest case: Anchored match need be tried only once.
if (prog->reganch) {
int c = utf_ptr2char((char *)rex.line + col);
if (prog->regstart == NUL
|| prog->regstart == c
|| (rex.reg_ic
&& (utf_fold(prog->regstart) == utf_fold(c)
|| (c < 255 && prog->regstart < 255
&& mb_tolower(prog->regstart) == mb_tolower(c))))) {
retval = regtry(prog, col, tm, timed_out);
} else {
retval = 0;
}
} else {
int tm_count = 0;
// Messy cases: unanchored match.
while (!got_int) {
if (prog->regstart != NUL) {
// Skip until the char we know it must start with.
s = (uint8_t *)cstrchr((char *)rex.line + col, prog->regstart);
if (s == NULL) {
retval = 0;
break;
}
col = (int)(s - rex.line);
}
// Check for maximum column to try.
if (rex.reg_maxcol > 0 && col >= rex.reg_maxcol) {
retval = 0;
break;
}
retval = regtry(prog, col, tm, timed_out);
if (retval > 0) {
break;
}
// if not currently on the first line, get it again
if (rex.lnum != 0) {
rex.lnum = 0;
rex.line = (uint8_t *)reg_getline(0);
}
if (rex.line[col] == NUL) {
break;
}
col += utfc_ptr2len((char *)rex.line + col);
// Check for timeout once in a twenty times to avoid overhead.
if (tm != NULL && ++tm_count == 20) {
tm_count = 0;
if (profile_passed_limit(*tm)) {
if (timed_out != NULL) {
*timed_out = true;
}
break;
}
}
}
}
theend:
// Free "reg_tofree" when it's a bit big.
// Free regstack and backpos if they are bigger than their initial size.
if (reg_tofreelen > 400) {
XFREE_CLEAR(reg_tofree);
}
if (regstack.ga_maxlen > REGSTACK_INITIAL) {
ga_clear(&regstack);
}
if (backpos.ga_maxlen > BACKPOS_INITIAL) {
ga_clear(&backpos);
}
if (retval > 0) {
// Make sure the end is never before the start. Can happen when \zs
// and \ze are used.
if (REG_MULTI) {
const lpos_T *const start = &rex.reg_mmatch->startpos[0];
const lpos_T *const end = &rex.reg_mmatch->endpos[0];
if (end->lnum < start->lnum
|| (end->lnum == start->lnum && end->col < start->col)) {
rex.reg_mmatch->endpos[0] = rex.reg_mmatch->startpos[0];
}
// startpos[0] may be set by "\zs", also return the column where
// the whole pattern matched.
rex.reg_mmatch->rmm_matchcol = col;
} else {
if (rex.reg_match->endp[0] < rex.reg_match->startp[0]) {
rex.reg_match->endp[0] = rex.reg_match->startp[0];
}
// startpos[0] may be set by "\zs", also return the column where
// the whole pattern matched.
rex.reg_match->rm_matchcol = col;
}
}
return retval;
}
/// Match a regexp against a string.
/// "rmp->regprog" is a compiled regexp as returned by vim_regcomp().
/// Uses curbuf for line count and 'iskeyword'.
/// If "line_lbr" is true, consider a "\n" in "line" to be a line break.
///
/// @param line string to match against
/// @param col column to start looking for match
///
/// @return 0 for failure, number of lines contained in the match otherwise.
static int bt_regexec_nl(regmatch_T *rmp, uint8_t *line, colnr_T col, bool line_lbr)
{
rex.reg_match = rmp;
rex.reg_mmatch = NULL;
rex.reg_maxline = 0;
rex.reg_line_lbr = line_lbr;
rex.reg_buf = curbuf;
rex.reg_win = NULL;
rex.reg_ic = rmp->rm_ic;
rex.reg_icombine = false;
rex.reg_nobreak = rmp->regprog->re_flags & RE_NOBREAK;
rex.reg_maxcol = 0;
int64_t r = bt_regexec_both(line, col, NULL, NULL);
assert(r <= INT_MAX);
return (int)r;
}
/// Matches a regexp against multiple lines.
/// "rmp->regprog" is a compiled regexp as returned by vim_regcomp().
/// Uses curbuf for line count and 'iskeyword'.
///
/// @param win Window in which to search or NULL
/// @param buf Buffer in which to search
/// @param lnum Number of line to start looking for match
/// @param col Column to start looking for match
/// @param tm Timeout limit or NULL
///
/// @return zero if there is no match and number of lines contained in the match
/// otherwise.
static int bt_regexec_multi(regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col,
proftime_T *tm, int *timed_out)
{
init_regexec_multi(rmp, win, buf, lnum);
return bt_regexec_both(NULL, col, tm, timed_out);
}
// Compare a number with the operand of RE_LNUM, RE_COL or RE_VCOL.
static int re_num_cmp(uint32_t val, const uint8_t *scan)
{
uint32_t n = (uint32_t)OPERAND_MIN(scan);
if (OPERAND_CMP(scan) == '>') {
return val > n;
}
if (OPERAND_CMP(scan) == '<') {
return val < n;
}
return val == n;
}
#ifdef BT_REGEXP_DUMP
// regdump - dump a regexp onto stdout in vaguely comprehensible form
static void regdump(uint8_t *pattern, bt_regprog_T *r)
{
uint8_t *s;
int op = EXACTLY; // Arbitrary non-END op.
uint8_t *next;
uint8_t *end = NULL;
FILE *f;
# ifdef BT_REGEXP_LOG
f = fopen("bt_regexp_log.log", "a");
# else
f = stdout;
# endif
if (f == NULL) {
return;
}
fprintf(f, "-------------------------------------\n\r\nregcomp(%s):\r\n",
pattern);
s = r->program + 1;
// Loop until we find the END that isn't before a referred next (an END
// can also appear in a NOMATCH operand).
while (op != END || s <= end) {
op = OP(s);
fprintf(f, "%2d%s", (int)(s - r->program), regprop(s)); // Where, what.
next = regnext(s);
if (next == NULL) { // Next ptr.
fprintf(f, "(0)");
} else {
fprintf(f, "(%d)", (int)((s - r->program) + (next - s)));
}
if (end < next) {
end = next;
}
if (op == BRACE_LIMITS) {
// Two ints
fprintf(f, " minval %" PRId64 ", maxval %" PRId64,
(int64_t)OPERAND_MIN(s), (int64_t)OPERAND_MAX(s));
s += 8;
} else if (op == BEHIND || op == NOBEHIND) {
// one int
fprintf(f, " count %" PRId64, (int64_t)OPERAND_MIN(s));
s += 4;
} else if (op == RE_LNUM || op == RE_COL || op == RE_VCOL) {
// one int plus comparator
fprintf(f, " count %" PRId64, (int64_t)OPERAND_MIN(s));
s += 5;
}
s += 3;
if (op == ANYOF || op == ANYOF + ADD_NL
|| op == ANYBUT || op == ANYBUT + ADD_NL
|| op == EXACTLY) {
// Literal string, where present.
fprintf(f, "\nxxxxxxxxx\n");
while (*s != NUL) {
fprintf(f, "%c", *s++);
}
fprintf(f, "\nxxxxxxxxx\n");
s++;
}
fprintf(f, "\r\n");
}
// Header fields of interest.
if (r->regstart != NUL) {
fprintf(f, "start `%s' 0x%x; ", r->regstart < 256
? (char *)transchar(r->regstart)
: "multibyte", r->regstart);
}
if (r->reganch) {
fprintf(f, "anchored; ");
}
if (r->regmust != NULL) {
fprintf(f, "must have \"%s\"", r->regmust);
}
fprintf(f, "\r\n");
# ifdef BT_REGEXP_LOG
fclose(f);
# endif
}
#endif // BT_REGEXP_DUMP
#ifdef REGEXP_DEBUG
// regprop - printable representation of opcode
static uint8_t *regprop(uint8_t *op)
{
char *p;
static char buf[50];
STRCPY(buf, ":");
switch ((int)OP(op)) {
case BOL:
p = "BOL";
break;
case EOL:
p = "EOL";
break;
case RE_BOF:
p = "BOF";
break;
case RE_EOF:
p = "EOF";
break;
case CURSOR:
p = "CURSOR";
break;
case RE_VISUAL:
p = "RE_VISUAL";
break;
case RE_LNUM:
p = "RE_LNUM";
break;
case RE_MARK:
p = "RE_MARK";
break;
case RE_COL:
p = "RE_COL";
break;
case RE_VCOL:
p = "RE_VCOL";
break;
case BOW:
p = "BOW";
break;
case EOW:
p = "EOW";
break;
case ANY:
p = "ANY";
break;
case ANY + ADD_NL:
p = "ANY+NL";
break;
case ANYOF:
p = "ANYOF";
break;
case ANYOF + ADD_NL:
p = "ANYOF+NL";
break;
case ANYBUT:
p = "ANYBUT";
break;
case ANYBUT + ADD_NL:
p = "ANYBUT+NL";
break;
case IDENT:
p = "IDENT";
break;
case IDENT + ADD_NL:
p = "IDENT+NL";
break;
case SIDENT:
p = "SIDENT";
break;
case SIDENT + ADD_NL:
p = "SIDENT+NL";
break;
case KWORD:
p = "KWORD";
break;
case KWORD + ADD_NL:
p = "KWORD+NL";
break;
case SKWORD:
p = "SKWORD";
break;
case SKWORD + ADD_NL:
p = "SKWORD+NL";
break;
case FNAME:
p = "FNAME";
break;
case FNAME + ADD_NL:
p = "FNAME+NL";
break;
case SFNAME:
p = "SFNAME";
break;
case SFNAME + ADD_NL:
p = "SFNAME+NL";
break;
case PRINT:
p = "PRINT";
break;
case PRINT + ADD_NL:
p = "PRINT+NL";
break;
case SPRINT:
p = "SPRINT";
break;
case SPRINT + ADD_NL:
p = "SPRINT+NL";
break;
case WHITE:
p = "WHITE";
break;
case WHITE + ADD_NL:
p = "WHITE+NL";
break;
case NWHITE:
p = "NWHITE";
break;
case NWHITE + ADD_NL:
p = "NWHITE+NL";
break;
case DIGIT:
p = "DIGIT";
break;
case DIGIT + ADD_NL:
p = "DIGIT+NL";
break;
case NDIGIT:
p = "NDIGIT";
break;
case NDIGIT + ADD_NL:
p = "NDIGIT+NL";
break;
case HEX:
p = "HEX";
break;
case HEX + ADD_NL:
p = "HEX+NL";
break;
case NHEX:
p = "NHEX";
break;
case NHEX + ADD_NL:
p = "NHEX+NL";
break;
case OCTAL:
p = "OCTAL";
break;
case OCTAL + ADD_NL:
p = "OCTAL+NL";
break;
case NOCTAL:
p = "NOCTAL";
break;
case NOCTAL + ADD_NL:
p = "NOCTAL+NL";
break;
case WORD:
p = "WORD";
break;
case WORD + ADD_NL:
p = "WORD+NL";
break;
case NWORD:
p = "NWORD";
break;
case NWORD + ADD_NL:
p = "NWORD+NL";
break;
case HEAD:
p = "HEAD";
break;
case HEAD + ADD_NL:
p = "HEAD+NL";
break;
case NHEAD:
p = "NHEAD";
break;
case NHEAD + ADD_NL:
p = "NHEAD+NL";
break;
case ALPHA:
p = "ALPHA";
break;
case ALPHA + ADD_NL:
p = "ALPHA+NL";
break;
case NALPHA:
p = "NALPHA";
break;
case NALPHA + ADD_NL:
p = "NALPHA+NL";
break;
case LOWER:
p = "LOWER";
break;
case LOWER + ADD_NL:
p = "LOWER+NL";
break;
case NLOWER:
p = "NLOWER";
break;
case NLOWER + ADD_NL:
p = "NLOWER+NL";
break;
case UPPER:
p = "UPPER";
break;
case UPPER + ADD_NL:
p = "UPPER+NL";
break;
case NUPPER:
p = "NUPPER";
break;
case NUPPER + ADD_NL:
p = "NUPPER+NL";
break;
case BRANCH:
p = "BRANCH";
break;
case EXACTLY:
p = "EXACTLY";
break;
case NOTHING:
p = "NOTHING";
break;
case BACK:
p = "BACK";
break;
case END:
p = "END";
break;
case MOPEN + 0:
p = "MATCH START";
break;
case MOPEN + 1:
case MOPEN + 2:
case MOPEN + 3:
case MOPEN + 4:
case MOPEN + 5:
case MOPEN + 6:
case MOPEN + 7:
case MOPEN + 8:
case MOPEN + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "MOPEN%d", OP(op) - MOPEN);
p = NULL;
break;
case MCLOSE + 0:
p = "MATCH END";
break;
case MCLOSE + 1:
case MCLOSE + 2:
case MCLOSE + 3:
case MCLOSE + 4:
case MCLOSE + 5:
case MCLOSE + 6:
case MCLOSE + 7:
case MCLOSE + 8:
case MCLOSE + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "MCLOSE%d", OP(op) - MCLOSE);
p = NULL;
break;
case BACKREF + 1:
case BACKREF + 2:
case BACKREF + 3:
case BACKREF + 4:
case BACKREF + 5:
case BACKREF + 6:
case BACKREF + 7:
case BACKREF + 8:
case BACKREF + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "BACKREF%d", OP(op) - BACKREF);
p = NULL;
break;
case NOPEN:
p = "NOPEN";
break;
case NCLOSE:
p = "NCLOSE";
break;
case ZOPEN + 1:
case ZOPEN + 2:
case ZOPEN + 3:
case ZOPEN + 4:
case ZOPEN + 5:
case ZOPEN + 6:
case ZOPEN + 7:
case ZOPEN + 8:
case ZOPEN + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "ZOPEN%d", OP(op) - ZOPEN);
p = NULL;
break;
case ZCLOSE + 1:
case ZCLOSE + 2:
case ZCLOSE + 3:
case ZCLOSE + 4:
case ZCLOSE + 5:
case ZCLOSE + 6:
case ZCLOSE + 7:
case ZCLOSE + 8:
case ZCLOSE + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "ZCLOSE%d", OP(op) - ZCLOSE);
p = NULL;
break;
case ZREF + 1:
case ZREF + 2:
case ZREF + 3:
case ZREF + 4:
case ZREF + 5:
case ZREF + 6:
case ZREF + 7:
case ZREF + 8:
case ZREF + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "ZREF%d", OP(op) - ZREF);
p = NULL;
break;
case STAR:
p = "STAR";
break;
case PLUS:
p = "PLUS";
break;
case NOMATCH:
p = "NOMATCH";
break;
case MATCH:
p = "MATCH";
break;
case BEHIND:
p = "BEHIND";
break;
case NOBEHIND:
p = "NOBEHIND";
break;
case SUBPAT:
p = "SUBPAT";
break;
case BRACE_LIMITS:
p = "BRACE_LIMITS";
break;
case BRACE_SIMPLE:
p = "BRACE_SIMPLE";
break;
case BRACE_COMPLEX + 0:
case BRACE_COMPLEX + 1:
case BRACE_COMPLEX + 2:
case BRACE_COMPLEX + 3:
case BRACE_COMPLEX + 4:
case BRACE_COMPLEX + 5:
case BRACE_COMPLEX + 6:
case BRACE_COMPLEX + 7:
case BRACE_COMPLEX + 8:
case BRACE_COMPLEX + 9:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "BRACE_COMPLEX%d",
OP(op) - BRACE_COMPLEX);
p = NULL;
break;
case MULTIBYTECODE:
p = "MULTIBYTECODE";
break;
case NEWL:
p = "NEWL";
break;
default:
snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "corrupt %d", OP(op));
p = NULL;
break;
}
if (p != NULL) {
STRCAT(buf, p);
}
return (uint8_t *)buf;
}
#endif // REGEXP_DEBUG
// }}}1
// regexp_nfa.c {{{1
// NFA regular expression implementation.
// Logging of NFA engine.
//
// The NFA engine can write four log files:
// - Error log: Contains NFA engine's fatal errors.
// - Dump log: Contains compiled NFA state machine's information.
// - Run log: Contains information of matching procedure.
// - Debug log: Contains detailed information of matching procedure. Can be
// disabled by undefining NFA_REGEXP_DEBUG_LOG.
// The first one can also be used without debug mode.
// The last three are enabled when compiled as debug mode and individually
// disabled by commenting them out.
// The log files can get quite big!
// To disable all of this when compiling Vim for debugging, undefine REGEXP_DEBUG in
// regexp.c
#ifdef REGEXP_DEBUG
# define NFA_REGEXP_ERROR_LOG "nfa_regexp_error.log"
# define NFA_REGEXP_DUMP_LOG "nfa_regexp_dump.log"
# define NFA_REGEXP_RUN_LOG "nfa_regexp_run.log"
# define NFA_REGEXP_DEBUG_LOG "nfa_regexp_debug.log"
#endif
// Added to NFA_ANY - NFA_NUPPER_IC to include a NL.
#define NFA_ADD_NL 31
enum {
NFA_SPLIT = -1024,
NFA_MATCH,
NFA_EMPTY, // matches 0-length
NFA_START_COLL, // [abc] start
NFA_END_COLL, // [abc] end
NFA_START_NEG_COLL, // [^abc] start
NFA_END_NEG_COLL, // [^abc] end (postfix only)
NFA_RANGE, // range of the two previous items
// (postfix only)
NFA_RANGE_MIN, // low end of a range
NFA_RANGE_MAX, // high end of a range
NFA_CONCAT, // concatenate two previous items (postfix
// only)
NFA_OR, // \| (postfix only)
NFA_STAR, // greedy * (postfix only)
NFA_STAR_NONGREEDY, // non-greedy * (postfix only)
NFA_QUEST, // greedy \? (postfix only)
NFA_QUEST_NONGREEDY, // non-greedy \? (postfix only)
NFA_BOL, // ^ Begin line
NFA_EOL, // $ End line
NFA_BOW, // \< Begin word
NFA_EOW, // \> End word
NFA_BOF, // \%^ Begin file
NFA_EOF, // \%$ End file
NFA_NEWL,
NFA_ZSTART, // Used for \zs
NFA_ZEND, // Used for \ze
NFA_NOPEN, // Start of subexpression marked with \%(
NFA_NCLOSE, // End of subexpr. marked with \%( ... \)
NFA_START_INVISIBLE,
NFA_START_INVISIBLE_FIRST,
NFA_START_INVISIBLE_NEG,
NFA_START_INVISIBLE_NEG_FIRST,
NFA_START_INVISIBLE_BEFORE,
NFA_START_INVISIBLE_BEFORE_FIRST,
NFA_START_INVISIBLE_BEFORE_NEG,
NFA_START_INVISIBLE_BEFORE_NEG_FIRST,
NFA_START_PATTERN,
NFA_END_INVISIBLE,
NFA_END_INVISIBLE_NEG,
NFA_END_PATTERN,
NFA_COMPOSING, // Next nodes in NFA are part of the
// composing multibyte char
NFA_END_COMPOSING, // End of a composing char in the NFA
NFA_ANY_COMPOSING, // \%C: Any composing characters.
NFA_OPT_CHARS, // \%[abc]
// The following are used only in the postfix form, not in the NFA
NFA_PREV_ATOM_NO_WIDTH, // Used for \@=
NFA_PREV_ATOM_NO_WIDTH_NEG, // Used for \@!
NFA_PREV_ATOM_JUST_BEFORE, // Used for \@<=
NFA_PREV_ATOM_JUST_BEFORE_NEG, // Used for \@<!
NFA_PREV_ATOM_LIKE_PATTERN, // Used for \@>
NFA_BACKREF1, // \1
NFA_BACKREF2, // \2
NFA_BACKREF3, // \3
NFA_BACKREF4, // \4
NFA_BACKREF5, // \5
NFA_BACKREF6, // \6
NFA_BACKREF7, // \7
NFA_BACKREF8, // \8
NFA_BACKREF9, // \9
NFA_ZREF1, // \z1
NFA_ZREF2, // \z2
NFA_ZREF3, // \z3
NFA_ZREF4, // \z4
NFA_ZREF5, // \z5
NFA_ZREF6, // \z6
NFA_ZREF7, // \z7
NFA_ZREF8, // \z8
NFA_ZREF9, // \z9
NFA_SKIP, // Skip characters
NFA_MOPEN,
NFA_MOPEN1,
NFA_MOPEN2,
NFA_MOPEN3,
NFA_MOPEN4,
NFA_MOPEN5,
NFA_MOPEN6,
NFA_MOPEN7,
NFA_MOPEN8,
NFA_MOPEN9,
NFA_MCLOSE,
NFA_MCLOSE1,
NFA_MCLOSE2,
NFA_MCLOSE3,
NFA_MCLOSE4,
NFA_MCLOSE5,
NFA_MCLOSE6,
NFA_MCLOSE7,
NFA_MCLOSE8,
NFA_MCLOSE9,
NFA_ZOPEN,
NFA_ZOPEN1,
NFA_ZOPEN2,
NFA_ZOPEN3,
NFA_ZOPEN4,
NFA_ZOPEN5,
NFA_ZOPEN6,
NFA_ZOPEN7,
NFA_ZOPEN8,
NFA_ZOPEN9,
NFA_ZCLOSE,
NFA_ZCLOSE1,
NFA_ZCLOSE2,
NFA_ZCLOSE3,
NFA_ZCLOSE4,
NFA_ZCLOSE5,
NFA_ZCLOSE6,
NFA_ZCLOSE7,
NFA_ZCLOSE8,
NFA_ZCLOSE9,
// NFA_FIRST_NL
NFA_ANY, // Match any one character.
NFA_IDENT, // Match identifier char
NFA_SIDENT, // Match identifier char but no digit
NFA_KWORD, // Match keyword char
NFA_SKWORD, // Match word char but no digit
NFA_FNAME, // Match file name char
NFA_SFNAME, // Match file name char but no digit
NFA_PRINT, // Match printable char
NFA_SPRINT, // Match printable char but no digit
NFA_WHITE, // Match whitespace char
NFA_NWHITE, // Match non-whitespace char
NFA_DIGIT, // Match digit char
NFA_NDIGIT, // Match non-digit char
NFA_HEX, // Match hex char
NFA_NHEX, // Match non-hex char
NFA_OCTAL, // Match octal char
NFA_NOCTAL, // Match non-octal char
NFA_WORD, // Match word char
NFA_NWORD, // Match non-word char
NFA_HEAD, // Match head char
NFA_NHEAD, // Match non-head char
NFA_ALPHA, // Match alpha char
NFA_NALPHA, // Match non-alpha char
NFA_LOWER, // Match lowercase char
NFA_NLOWER, // Match non-lowercase char
NFA_UPPER, // Match uppercase char
NFA_NUPPER, // Match non-uppercase char
NFA_LOWER_IC, // Match [a-z]
NFA_NLOWER_IC, // Match [^a-z]
NFA_UPPER_IC, // Match [A-Z]
NFA_NUPPER_IC, // Match [^A-Z]
NFA_FIRST_NL = NFA_ANY + NFA_ADD_NL,
NFA_LAST_NL = NFA_NUPPER_IC + NFA_ADD_NL,
NFA_CURSOR, // Match cursor pos
NFA_LNUM, // Match line number
NFA_LNUM_GT, // Match > line number
NFA_LNUM_LT, // Match < line number
NFA_COL, // Match cursor column
NFA_COL_GT, // Match > cursor column
NFA_COL_LT, // Match < cursor column
NFA_VCOL, // Match cursor virtual column
NFA_VCOL_GT, // Match > cursor virtual column
NFA_VCOL_LT, // Match < cursor virtual column
NFA_MARK, // Match mark
NFA_MARK_GT, // Match > mark
NFA_MARK_LT, // Match < mark
NFA_VISUAL, // Match Visual area
// Character classes [:alnum:] etc
NFA_CLASS_ALNUM,
NFA_CLASS_ALPHA,
NFA_CLASS_BLANK,
NFA_CLASS_CNTRL,
NFA_CLASS_DIGIT,
NFA_CLASS_GRAPH,
NFA_CLASS_LOWER,
NFA_CLASS_PRINT,
NFA_CLASS_PUNCT,
NFA_CLASS_SPACE,
NFA_CLASS_UPPER,
NFA_CLASS_XDIGIT,
NFA_CLASS_TAB,
NFA_CLASS_RETURN,
NFA_CLASS_BACKSPACE,
NFA_CLASS_ESCAPE,
NFA_CLASS_IDENT,
NFA_CLASS_KEYWORD,
NFA_CLASS_FNAME,
};
// Keep in sync with classchars.
static int nfa_classcodes[] = {
NFA_ANY, NFA_IDENT, NFA_SIDENT, NFA_KWORD, NFA_SKWORD,
NFA_FNAME, NFA_SFNAME, NFA_PRINT, NFA_SPRINT,
NFA_WHITE, NFA_NWHITE, NFA_DIGIT, NFA_NDIGIT,
NFA_HEX, NFA_NHEX, NFA_OCTAL, NFA_NOCTAL,
NFA_WORD, NFA_NWORD, NFA_HEAD, NFA_NHEAD,
NFA_ALPHA, NFA_NALPHA, NFA_LOWER, NFA_NLOWER,
NFA_UPPER, NFA_NUPPER
};
static const char e_nul_found[] = N_("E865: (NFA) Regexp end encountered prematurely");
static const char e_misplaced[] = N_("E866: (NFA regexp) Misplaced %c");
static const char e_ill_char_class[] = N_("E877: (NFA regexp) Invalid character class: %" PRId64);
static const char e_value_too_large[] = N_("E951: \\% value too large");
// Variables only used in nfa_regcomp() and descendants.
static int nfa_re_flags; ///< re_flags passed to nfa_regcomp().
static int *post_start; ///< holds the postfix form of r.e.
static int *post_end;
static int *post_ptr;
// Set when the pattern should use the NFA engine.
// E.g. [[:upper:]] only allows 8bit characters for BT engine,
// while NFA engine handles multibyte characters correctly.
static bool wants_nfa;
static int nstate; ///< Number of states in the NFA. Also used when executing.
static int istate; ///< Index in the state vector, used in alloc_state()
// If not NULL match must end at this position
static save_se_T *nfa_endp = NULL;
// 0 for first call to nfa_regmatch(), 1 for recursive call.
static int nfa_ll_index = 0;
// Helper functions used when doing re2post() ... regatom() parsing
#define EMIT(c) \
do { \
if (post_ptr >= post_end) { \
realloc_post_list(); \
} \
*post_ptr++ = c; \
} while (0)
/// Initialize internal variables before NFA compilation.
///
/// @param re_flags @see vim_regcomp()
static void nfa_regcomp_start(uint8_t *expr, int re_flags)
{
size_t postfix_size;
size_t nstate_max;
nstate = 0;
istate = 0;
// A reasonable estimation for maximum size
nstate_max = (strlen((char *)expr) + 1) * 25;
// Some items blow up in size, such as [A-z]. Add more space for that.
// When it is still not enough realloc_post_list() will be used.
nstate_max += 1000;
// Size for postfix representation of expr.
postfix_size = sizeof(int) * nstate_max;
post_start = (int *)xmalloc(postfix_size);
post_ptr = post_start;
post_end = post_start + nstate_max;
wants_nfa = false;
rex.nfa_has_zend = false;
rex.nfa_has_backref = false;
// shared with BT engine
regcomp_start(expr, re_flags);
}
// Figure out if the NFA state list starts with an anchor, must match at start
// of the line.
static int nfa_get_reganch(nfa_state_T *start, int depth)
{
nfa_state_T *p = start;
if (depth > 4) {
return 0;
}
while (p != NULL) {
switch (p->c) {
case NFA_BOL:
case NFA_BOF:
return 1; // yes!
case NFA_ZSTART:
case NFA_ZEND:
case NFA_CURSOR:
case NFA_VISUAL:
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_NOPEN:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
p = p->out;
break;
case NFA_SPLIT:
return nfa_get_reganch(p->out, depth + 1)
&& nfa_get_reganch(p->out1, depth + 1);
default:
return 0; // noooo
}
}
return 0;
}
// Figure out if the NFA state list starts with a character which must match
// at start of the match.
static int nfa_get_regstart(nfa_state_T *start, int depth)
{
nfa_state_T *p = start;
if (depth > 4) {
return 0;
}
while (p != NULL) {
switch (p->c) {
// all kinds of zero-width matches
case NFA_BOL:
case NFA_BOF:
case NFA_BOW:
case NFA_EOW:
case NFA_ZSTART:
case NFA_ZEND:
case NFA_CURSOR:
case NFA_VISUAL:
case NFA_LNUM:
case NFA_LNUM_GT:
case NFA_LNUM_LT:
case NFA_COL:
case NFA_COL_GT:
case NFA_COL_LT:
case NFA_VCOL:
case NFA_VCOL_GT:
case NFA_VCOL_LT:
case NFA_MARK:
case NFA_MARK_GT:
case NFA_MARK_LT:
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_NOPEN:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
p = p->out;
break;
case NFA_SPLIT: {
int c1 = nfa_get_regstart(p->out, depth + 1);
int c2 = nfa_get_regstart(p->out1, depth + 1);
if (c1 == c2) {
return c1; // yes!
}
return 0;
}
default:
if (p->c > 0) {
return p->c; // yes!
}
return 0;
}
}
return 0;
}
// Figure out if the NFA state list contains just literal text and nothing
// else. If so return a string in allocated memory with what must match after
// regstart. Otherwise return NULL.
static uint8_t *nfa_get_match_text(nfa_state_T *start)
{
nfa_state_T *p = start;
int len = 0;
uint8_t *ret;
uint8_t *s;
if (p->c != NFA_MOPEN) {
return NULL; // just in case
}
p = p->out;
while (p->c > 0) {
len += utf_char2len(p->c);
p = p->out;
}
if (p->c != NFA_MCLOSE || p->out->c != NFA_MATCH) {
return NULL;
}
ret = xmalloc((size_t)len);
p = start->out->out; // skip first char, it goes into regstart
s = ret;
while (p->c > 0) {
s += utf_char2bytes(p->c, (char *)s);
p = p->out;
}
*s = NUL;
return ret;
}
// Allocate more space for post_start. Called when
// running above the estimated number of states.
static void realloc_post_list(void)
{
// For weird patterns the number of states can be very high. Increasing by
// 50% seems a reasonable compromise between memory use and speed.
const size_t new_max = (size_t)(post_end - post_start) * 3 / 2;
int *new_start = xrealloc(post_start, new_max * sizeof(int));
post_ptr = new_start + (post_ptr - post_start);
post_end = new_start + new_max;
post_start = new_start;
}
// Search between "start" and "end" and try to recognize a
// character class in expanded form. For example [0-9].
// On success, return the id the character class to be emitted.
// On failure, return 0 (=FAIL)
// Start points to the first char of the range, while end should point
// to the closing brace.
// Keep in mind that 'ignorecase' applies at execution time, thus [a-z] may
// need to be interpreted as [a-zA-Z].
static int nfa_recognize_char_class(uint8_t *start, const uint8_t *end, int extra_newl)
{
#define CLASS_not 0x80
#define CLASS_af 0x40
#define CLASS_AF 0x20
#define CLASS_az 0x10
#define CLASS_AZ 0x08
#define CLASS_o7 0x04
#define CLASS_o9 0x02
#define CLASS_underscore 0x01
uint8_t *p;
int config = 0;
bool newl = extra_newl == true;
if (*end != ']') {
return FAIL;
}
p = start;
if (*p == '^') {
config |= CLASS_not;
p++;
}
while (p < end) {
if (p + 2 < end && *(p + 1) == '-') {
switch (*p) {
case '0':
if (*(p + 2) == '9') {
config |= CLASS_o9;
break;
} else if (*(p + 2) == '7') {
config |= CLASS_o7;
break;
}
return FAIL;
case 'a':
if (*(p + 2) == 'z') {
config |= CLASS_az;
break;
} else if (*(p + 2) == 'f') {
config |= CLASS_af;
break;
}
return FAIL;
case 'A':
if (*(p + 2) == 'Z') {
config |= CLASS_AZ;
break;
} else if (*(p + 2) == 'F') {
config |= CLASS_AF;
break;
}
return FAIL;
default:
return FAIL;
}
p += 3;
} else if (p + 1 < end && *p == '\\' && *(p + 1) == 'n') {
newl = true;
p += 2;
} else if (*p == '_') {
config |= CLASS_underscore;
p++;
} else if (*p == '\n') {
newl = true;
p++;
} else {
return FAIL;
}
} // while (p < end)
if (p != end) {
return FAIL;
}
if (newl == true) {
extra_newl = NFA_ADD_NL;
}
switch (config) {
case CLASS_o9:
return extra_newl + NFA_DIGIT;
case CLASS_not | CLASS_o9:
return extra_newl + NFA_NDIGIT;
case CLASS_af | CLASS_AF | CLASS_o9:
return extra_newl + NFA_HEX;
case CLASS_not | CLASS_af | CLASS_AF | CLASS_o9:
return extra_newl + NFA_NHEX;
case CLASS_o7:
return extra_newl + NFA_OCTAL;
case CLASS_not | CLASS_o7:
return extra_newl + NFA_NOCTAL;
case CLASS_az | CLASS_AZ | CLASS_o9 | CLASS_underscore:
return extra_newl + NFA_WORD;
case CLASS_not | CLASS_az | CLASS_AZ | CLASS_o9 | CLASS_underscore:
return extra_newl + NFA_NWORD;
case CLASS_az | CLASS_AZ | CLASS_underscore:
return extra_newl + NFA_HEAD;
case CLASS_not | CLASS_az | CLASS_AZ | CLASS_underscore:
return extra_newl + NFA_NHEAD;
case CLASS_az | CLASS_AZ:
return extra_newl + NFA_ALPHA;
case CLASS_not | CLASS_az | CLASS_AZ:
return extra_newl + NFA_NALPHA;
case CLASS_az:
return extra_newl + NFA_LOWER_IC;
case CLASS_not | CLASS_az:
return extra_newl + NFA_NLOWER_IC;
case CLASS_AZ:
return extra_newl + NFA_UPPER_IC;
case CLASS_not | CLASS_AZ:
return extra_newl + NFA_NUPPER_IC;
}
return FAIL;
}
// Produce the bytes for equivalence class "c".
// Currently only handles latin1, latin9 and utf-8.
// Emits bytes in postfix notation: 'a,b,NFA_OR,c,NFA_OR' is
// equivalent to 'a OR b OR c'
//
// NOTE! When changing this function, also update reg_equi_class()
static void nfa_emit_equi_class(int c)
{
#define EMIT2(c) EMIT(c); EMIT(NFA_CONCAT);
{
#define A_grave 0xc0
#define A_acute 0xc1
#define A_circumflex 0xc2
#define A_virguilla 0xc3
#define A_diaeresis 0xc4
#define A_ring 0xc5
#define C_cedilla 0xc7
#define E_grave 0xc8
#define E_acute 0xc9
#define E_circumflex 0xca
#define E_diaeresis 0xcb
#define I_grave 0xcc
#define I_acute 0xcd
#define I_circumflex 0xce
#define I_diaeresis 0xcf
#define N_virguilla 0xd1
#define O_grave 0xd2
#define O_acute 0xd3
#define O_circumflex 0xd4
#define O_virguilla 0xd5
#define O_diaeresis 0xd6
#define O_slash 0xd8
#define U_grave 0xd9
#define U_acute 0xda
#define U_circumflex 0xdb
#define U_diaeresis 0xdc
#define Y_acute 0xdd
#define a_grave 0xe0
#define a_acute 0xe1
#define a_circumflex 0xe2
#define a_virguilla 0xe3
#define a_diaeresis 0xe4
#define a_ring 0xe5
#define c_cedilla 0xe7
#define e_grave 0xe8
#define e_acute 0xe9
#define e_circumflex 0xea
#define e_diaeresis 0xeb
#define i_grave 0xec
#define i_acute 0xed
#define i_circumflex 0xee
#define i_diaeresis 0xef
#define n_virguilla 0xf1
#define o_grave 0xf2
#define o_acute 0xf3
#define o_circumflex 0xf4
#define o_virguilla 0xf5
#define o_diaeresis 0xf6
#define o_slash 0xf8
#define u_grave 0xf9
#define u_acute 0xfa
#define u_circumflex 0xfb
#define u_diaeresis 0xfc
#define y_acute 0xfd
#define y_diaeresis 0xff
switch (c) {
case 'A':
case A_grave:
case A_acute:
case A_circumflex:
case A_virguilla:
case A_diaeresis:
case A_ring:
case 0x100:
case 0x102:
case 0x104:
case 0x1cd:
case 0x1de:
case 0x1e0:
case 0x1fa:
case 0x200:
case 0x202:
case 0x226:
case 0x23a:
case 0x1e00:
case 0x1ea0:
case 0x1ea2:
case 0x1ea4:
case 0x1ea6:
case 0x1ea8:
case 0x1eaa:
case 0x1eac:
case 0x1eae:
case 0x1eb0:
case 0x1eb2:
case 0x1eb4:
case 0x1eb6:
EMIT2('A') EMIT2(A_grave) EMIT2(A_acute)
EMIT2(A_circumflex) EMIT2(A_virguilla)
EMIT2(A_diaeresis) EMIT2(A_ring)
EMIT2(0x100) EMIT2(0x102) EMIT2(0x104)
EMIT2(0x1cd) EMIT2(0x1de) EMIT2(0x1e0)
EMIT2(0x1fa) EMIT2(0x200) EMIT2(0x202)
EMIT2(0x226) EMIT2(0x23a) EMIT2(0x1e00)
EMIT2(0x1ea0) EMIT2(0x1ea2) EMIT2(0x1ea4)
EMIT2(0x1ea6) EMIT2(0x1ea8) EMIT2(0x1eaa)
EMIT2(0x1eac) EMIT2(0x1eae) EMIT2(0x1eb0)
EMIT2(0x1eb2) EMIT2(0x1eb6) EMIT2(0x1eb4)
return;
case 'B':
case 0x181:
case 0x243:
case 0x1e02:
case 0x1e04:
case 0x1e06:
EMIT2('B')
EMIT2(0x181) EMIT2(0x243) EMIT2(0x1e02)
EMIT2(0x1e04) EMIT2(0x1e06)
return;
case 'C':
case C_cedilla:
case 0x106:
case 0x108:
case 0x10a:
case 0x10c:
case 0x187:
case 0x23b:
case 0x1e08:
case 0xa792:
EMIT2('C') EMIT2(C_cedilla)
EMIT2(0x106) EMIT2(0x108) EMIT2(0x10a)
EMIT2(0x10c) EMIT2(0x187) EMIT2(0x23b)
EMIT2(0x1e08) EMIT2(0xa792)
return;
case 'D':
case 0x10e:
case 0x110:
case 0x18a:
case 0x1e0a:
case 0x1e0c:
case 0x1e0e:
case 0x1e10:
case 0x1e12:
EMIT2('D') EMIT2(0x10e) EMIT2(0x110) EMIT2(0x18a)
EMIT2(0x1e0a) EMIT2(0x1e0c) EMIT2(0x1e0e)
EMIT2(0x1e10) EMIT2(0x1e12)
return;
case 'E':
case E_grave:
case E_acute:
case E_circumflex:
case E_diaeresis:
case 0x112:
case 0x114:
case 0x116:
case 0x118:
case 0x11a:
case 0x204:
case 0x206:
case 0x228:
case 0x246:
case 0x1e14:
case 0x1e16:
case 0x1e18:
case 0x1e1a:
case 0x1e1c:
case 0x1eb8:
case 0x1eba:
case 0x1ebc:
case 0x1ebe:
case 0x1ec0:
case 0x1ec2:
case 0x1ec4:
case 0x1ec6:
EMIT2('E') EMIT2(E_grave) EMIT2(E_acute)
EMIT2(E_circumflex) EMIT2(E_diaeresis)
EMIT2(0x112) EMIT2(0x114) EMIT2(0x116)
EMIT2(0x118) EMIT2(0x11a) EMIT2(0x204)
EMIT2(0x206) EMIT2(0x228) EMIT2(0x246)
EMIT2(0x1e14) EMIT2(0x1e16) EMIT2(0x1e18)
EMIT2(0x1e1a) EMIT2(0x1e1c) EMIT2(0x1eb8)
EMIT2(0x1eba) EMIT2(0x1ebc) EMIT2(0x1ebe)
EMIT2(0x1ec0) EMIT2(0x1ec2) EMIT2(0x1ec4)
EMIT2(0x1ec6)
return;
case 'F':
case 0x191:
case 0x1e1e:
case 0xa798:
EMIT2('F') EMIT2(0x191) EMIT2(0x1e1e) EMIT2(0xa798)
return;
case 'G':
case 0x11c:
case 0x11e:
case 0x120:
case 0x122:
case 0x193:
case 0x1e4:
case 0x1e6:
case 0x1f4:
case 0x1e20:
case 0xa7a0:
EMIT2('G') EMIT2(0x11c) EMIT2(0x11e) EMIT2(0x120)
EMIT2(0x122) EMIT2(0x193) EMIT2(0x1e4)
EMIT2(0x1e6) EMIT2(0x1f4) EMIT2(0x1e20)
EMIT2(0xa7a0)
return;
case 'H':
case 0x124:
case 0x126:
case 0x21e:
case 0x1e22:
case 0x1e24:
case 0x1e26:
case 0x1e28:
case 0x1e2a:
case 0x2c67:
EMIT2('H') EMIT2(0x124) EMIT2(0x126) EMIT2(0x21e)
EMIT2(0x1e22) EMIT2(0x1e24) EMIT2(0x1e26)
EMIT2(0x1e28) EMIT2(0x1e2a) EMIT2(0x2c67)
return;
case 'I':
case I_grave:
case I_acute:
case I_circumflex:
case I_diaeresis:
case 0x128:
case 0x12a:
case 0x12c:
case 0x12e:
case 0x130:
case 0x197:
case 0x1cf:
case 0x208:
case 0x20a:
case 0x1e2c:
case 0x1e2e:
case 0x1ec8:
case 0x1eca:
EMIT2('I') EMIT2(I_grave) EMIT2(I_acute)
EMIT2(I_circumflex) EMIT2(I_diaeresis)
EMIT2(0x128) EMIT2(0x12a) EMIT2(0x12c)
EMIT2(0x12e) EMIT2(0x130) EMIT2(0x197)
EMIT2(0x1cf) EMIT2(0x208) EMIT2(0x20a)
EMIT2(0x1e2c) EMIT2(0x1e2e) EMIT2(0x1ec8)
EMIT2(0x1eca)
return;
case 'J':
case 0x134:
case 0x248:
EMIT2('J') EMIT2(0x134) EMIT2(0x248)
return;
case 'K':
case 0x136:
case 0x198:
case 0x1e8:
case 0x1e30:
case 0x1e32:
case 0x1e34:
case 0x2c69:
case 0xa740:
EMIT2('K') EMIT2(0x136) EMIT2(0x198) EMIT2(0x1e8)
EMIT2(0x1e30) EMIT2(0x1e32) EMIT2(0x1e34)
EMIT2(0x2c69) EMIT2(0xa740)
return;
case 'L':
case 0x139:
case 0x13b:
case 0x13d:
case 0x13f:
case 0x141:
case 0x23d:
case 0x1e36:
case 0x1e38:
case 0x1e3a:
case 0x1e3c:
case 0x2c60:
EMIT2('L') EMIT2(0x139) EMIT2(0x13b)
EMIT2(0x13d) EMIT2(0x13f) EMIT2(0x141)
EMIT2(0x23d) EMIT2(0x1e36) EMIT2(0x1e38)
EMIT2(0x1e3a) EMIT2(0x1e3c) EMIT2(0x2c60)
return;
case 'M':
case 0x1e3e:
case 0x1e40:
case 0x1e42:
EMIT2('M') EMIT2(0x1e3e) EMIT2(0x1e40)
EMIT2(0x1e42)
return;
case 'N':
case N_virguilla:
case 0x143:
case 0x145:
case 0x147:
case 0x1f8:
case 0x1e44:
case 0x1e46:
case 0x1e48:
case 0x1e4a:
case 0xa7a4:
EMIT2('N') EMIT2(N_virguilla)
EMIT2(0x143) EMIT2(0x145) EMIT2(0x147)
EMIT2(0x1f8) EMIT2(0x1e44) EMIT2(0x1e46)
EMIT2(0x1e48) EMIT2(0x1e4a) EMIT2(0xa7a4)
return;
case 'O':
case O_grave:
case O_acute:
case O_circumflex:
case O_virguilla:
case O_diaeresis:
case O_slash:
case 0x14c:
case 0x14e:
case 0x150:
case 0x19f:
case 0x1a0:
case 0x1d1:
case 0x1ea:
case 0x1ec:
case 0x1fe:
case 0x20c:
case 0x20e:
case 0x22a:
case 0x22c:
case 0x22e:
case 0x230:
case 0x1e4c:
case 0x1e4e:
case 0x1e50:
case 0x1e52:
case 0x1ecc:
case 0x1ece:
case 0x1ed0:
case 0x1ed2:
case 0x1ed4:
case 0x1ed6:
case 0x1ed8:
case 0x1eda:
case 0x1edc:
case 0x1ede:
case 0x1ee0:
case 0x1ee2:
EMIT2('O') EMIT2(O_grave) EMIT2(O_acute)
EMIT2(O_circumflex) EMIT2(O_virguilla)
EMIT2(O_diaeresis) EMIT2(O_slash)
EMIT2(0x14c) EMIT2(0x14e) EMIT2(0x150)
EMIT2(0x19f) EMIT2(0x1a0) EMIT2(0x1d1)
EMIT2(0x1ea) EMIT2(0x1ec) EMIT2(0x1fe)
EMIT2(0x20c) EMIT2(0x20e) EMIT2(0x22a)
EMIT2(0x22c) EMIT2(0x22e) EMIT2(0x230)
EMIT2(0x1e4c) EMIT2(0x1e4e) EMIT2(0x1e50)
EMIT2(0x1e52) EMIT2(0x1ecc) EMIT2(0x1ece)
EMIT2(0x1ed0) EMIT2(0x1ed2) EMIT2(0x1ed4)
EMIT2(0x1ed6) EMIT2(0x1ed8) EMIT2(0x1eda)
EMIT2(0x1edc) EMIT2(0x1ede) EMIT2(0x1ee0)
EMIT2(0x1ee2)
return;
case 'P':
case 0x1a4:
case 0x1e54:
case 0x1e56:
case 0x2c63:
EMIT2('P') EMIT2(0x1a4) EMIT2(0x1e54) EMIT2(0x1e56)
EMIT2(0x2c63)
return;
case 'Q':
case 0x24a:
EMIT2('Q') EMIT2(0x24a)
return;
case 'R':
case 0x154:
case 0x156:
case 0x158:
case 0x210:
case 0x212:
case 0x24c:
case 0x1e58:
case 0x1e5a:
case 0x1e5c:
case 0x1e5e:
case 0x2c64:
case 0xa7a6:
EMIT2('R') EMIT2(0x154) EMIT2(0x156) EMIT2(0x158)
EMIT2(0x210) EMIT2(0x212) EMIT2(0x24c) EMIT2(0x1e58)
EMIT2(0x1e5a) EMIT2(0x1e5c) EMIT2(0x1e5e) EMIT2(0x2c64)
EMIT2(0xa7a6)
return;
case 'S':
case 0x15a:
case 0x15c:
case 0x15e:
case 0x160:
case 0x218:
case 0x1e60:
case 0x1e62:
case 0x1e64:
case 0x1e66:
case 0x1e68:
case 0x2c7e:
case 0xa7a8:
EMIT2('S') EMIT2(0x15a) EMIT2(0x15c) EMIT2(0x15e)
EMIT2(0x160) EMIT2(0x218) EMIT2(0x1e60) EMIT2(0x1e62)
EMIT2(0x1e64) EMIT2(0x1e66) EMIT2(0x1e68) EMIT2(0x2c7e)
EMIT2(0xa7a8)
return;
case 'T':
case 0x162:
case 0x164:
case 0x166:
case 0x1ac:
case 0x1ae:
case 0x21a:
case 0x23e:
case 0x1e6a:
case 0x1e6c:
case 0x1e6e:
case 0x1e70:
EMIT2('T') EMIT2(0x162) EMIT2(0x164) EMIT2(0x166)
EMIT2(0x1ac) EMIT2(0x1ae) EMIT2(0x23e) EMIT2(0x21a)
EMIT2(0x1e6a) EMIT2(0x1e6c) EMIT2(0x1e6e) EMIT2(0x1e70)
return;
case 'U':
case U_grave:
case U_acute:
case U_diaeresis:
case U_circumflex:
case 0x168:
case 0x16a:
case 0x16c:
case 0x16e:
case 0x170:
case 0x172:
case 0x1af:
case 0x1d3:
case 0x1d5:
case 0x1d7:
case 0x1d9:
case 0x1db:
case 0x214:
case 0x216:
case 0x244:
case 0x1e72:
case 0x1e74:
case 0x1e76:
case 0x1e78:
case 0x1e7a:
case 0x1ee4:
case 0x1ee6:
case 0x1ee8:
case 0x1eea:
case 0x1eec:
case 0x1eee:
case 0x1ef0:
EMIT2('U') EMIT2(U_grave) EMIT2(U_acute)
EMIT2(U_diaeresis) EMIT2(U_circumflex)
EMIT2(0x168) EMIT2(0x16a)
EMIT2(0x16c) EMIT2(0x16e) EMIT2(0x170)
EMIT2(0x172) EMIT2(0x1af) EMIT2(0x1d3)
EMIT2(0x1d5) EMIT2(0x1d7) EMIT2(0x1d9)
EMIT2(0x1db) EMIT2(0x214) EMIT2(0x216)
EMIT2(0x244) EMIT2(0x1e72) EMIT2(0x1e74)
EMIT2(0x1e76) EMIT2(0x1e78) EMIT2(0x1e7a)
EMIT2(0x1ee4) EMIT2(0x1ee6) EMIT2(0x1ee8)
EMIT2(0x1eea) EMIT2(0x1eec) EMIT2(0x1eee)
EMIT2(0x1ef0)
return;
case 'V':
case 0x1b2:
case 0x1e7c:
case 0x1e7e:
EMIT2('V') EMIT2(0x1b2) EMIT2(0x1e7c) EMIT2(0x1e7e)
return;
case 'W':
case 0x174:
case 0x1e80:
case 0x1e82:
case 0x1e84:
case 0x1e86:
case 0x1e88:
EMIT2('W') EMIT2(0x174) EMIT2(0x1e80) EMIT2(0x1e82)
EMIT2(0x1e84) EMIT2(0x1e86) EMIT2(0x1e88)
return;
case 'X':
case 0x1e8a:
case 0x1e8c:
EMIT2('X') EMIT2(0x1e8a) EMIT2(0x1e8c)
return;
case 'Y':
case Y_acute:
case 0x176:
case 0x178:
case 0x1b3:
case 0x232:
case 0x24e:
case 0x1e8e:
case 0x1ef2:
case 0x1ef4:
case 0x1ef6:
case 0x1ef8:
EMIT2('Y') EMIT2(Y_acute)
EMIT2(0x176) EMIT2(0x178) EMIT2(0x1b3)
EMIT2(0x232) EMIT2(0x24e) EMIT2(0x1e8e)
EMIT2(0x1ef2) EMIT2(0x1ef4) EMIT2(0x1ef6)
EMIT2(0x1ef8)
return;
case 'Z':
case 0x179:
case 0x17b:
case 0x17d:
case 0x1b5:
case 0x1e90:
case 0x1e92:
case 0x1e94:
case 0x2c6b:
EMIT2('Z') EMIT2(0x179) EMIT2(0x17b) EMIT2(0x17d)
EMIT2(0x1b5) EMIT2(0x1e90) EMIT2(0x1e92)
EMIT2(0x1e94) EMIT2(0x2c6b)
return;
case 'a':
case a_grave:
case a_acute:
case a_circumflex:
case a_virguilla:
case a_diaeresis:
case a_ring:
case 0x101:
case 0x103:
case 0x105:
case 0x1ce:
case 0x1df:
case 0x1e1:
case 0x1fb:
case 0x201:
case 0x203:
case 0x227:
case 0x1d8f:
case 0x1e01:
case 0x1e9a:
case 0x1ea1:
case 0x1ea3:
case 0x1ea5:
case 0x1ea7:
case 0x1ea9:
case 0x1eab:
case 0x1ead:
case 0x1eaf:
case 0x1eb1:
case 0x1eb3:
case 0x1eb5:
case 0x1eb7:
case 0x2c65:
EMIT2('a') EMIT2(a_grave) EMIT2(a_acute)
EMIT2(a_circumflex) EMIT2(a_virguilla)
EMIT2(a_diaeresis) EMIT2(a_ring)
EMIT2(0x101) EMIT2(0x103) EMIT2(0x105)
EMIT2(0x1ce) EMIT2(0x1df) EMIT2(0x1e1)
EMIT2(0x1fb) EMIT2(0x201) EMIT2(0x203)
EMIT2(0x227) EMIT2(0x1d8f) EMIT2(0x1e01)
EMIT2(0x1e9a) EMIT2(0x1ea1) EMIT2(0x1ea3)
EMIT2(0x1ea5) EMIT2(0x1ea7) EMIT2(0x1ea9)
EMIT2(0x1eab) EMIT2(0x1ead) EMIT2(0x1eaf)
EMIT2(0x1eb1) EMIT2(0x1eb3) EMIT2(0x1eb5)
EMIT2(0x1eb7) EMIT2(0x2c65)
return;
case 'b':
case 0x180:
case 0x253:
case 0x1d6c:
case 0x1d80:
case 0x1e03:
case 0x1e05:
case 0x1e07:
EMIT2('b') EMIT2(0x180) EMIT2(0x253) EMIT2(0x1d6c)
EMIT2(0x1d80) EMIT2(0x1e03) EMIT2(0x1e05) EMIT2(0x1e07)
return;
case 'c':
case c_cedilla:
case 0x107:
case 0x109:
case 0x10b:
case 0x10d:
case 0x188:
case 0x23c:
case 0x1e09:
case 0xa793:
case 0xa794:
EMIT2('c') EMIT2(c_cedilla)
EMIT2(0x107) EMIT2(0x109) EMIT2(0x10b)
EMIT2(0x10d) EMIT2(0x188) EMIT2(0x23c)
EMIT2(0x1e09) EMIT2(0xa793) EMIT2(0xa794)
return;
case 'd':
case 0x10f:
case 0x111:
case 0x257:
case 0x1d6d:
case 0x1d81:
case 0x1d91:
case 0x1e0b:
case 0x1e0d:
case 0x1e0f:
case 0x1e11:
case 0x1e13:
EMIT2('d') EMIT2(0x10f) EMIT2(0x111)
EMIT2(0x257) EMIT2(0x1d6d) EMIT2(0x1d81)
EMIT2(0x1d91) EMIT2(0x1e0b) EMIT2(0x1e0d)
EMIT2(0x1e0f) EMIT2(0x1e11) EMIT2(0x1e13)
return;
case 'e':
case e_grave:
case e_acute:
case e_circumflex:
case e_diaeresis:
case 0x113:
case 0x115:
case 0x117:
case 0x119:
case 0x11b:
case 0x205:
case 0x207:
case 0x229:
case 0x247:
case 0x1d92:
case 0x1e15:
case 0x1e17:
case 0x1e19:
case 0x1e1b:
case 0x1e1d:
case 0x1eb9:
case 0x1ebb:
case 0x1ebd:
case 0x1ebf:
case 0x1ec1:
case 0x1ec3:
case 0x1ec5:
case 0x1ec7:
EMIT2('e') EMIT2(e_grave) EMIT2(e_acute)
EMIT2(e_circumflex) EMIT2(e_diaeresis)
EMIT2(0x113) EMIT2(0x115)
EMIT2(0x117) EMIT2(0x119) EMIT2(0x11b)
EMIT2(0x205) EMIT2(0x207) EMIT2(0x229)
EMIT2(0x247) EMIT2(0x1d92) EMIT2(0x1e15)
EMIT2(0x1e17) EMIT2(0x1e19) EMIT2(0x1e1b)
EMIT2(0x1e1d) EMIT2(0x1eb9) EMIT2(0x1ebb)
EMIT2(0x1ebd) EMIT2(0x1ebf) EMIT2(0x1ec1)
EMIT2(0x1ec3) EMIT2(0x1ec5) EMIT2(0x1ec7)
return;
case 'f':
case 0x192:
case 0x1d6e:
case 0x1d82:
case 0x1e1f:
case 0xa799:
EMIT2('f') EMIT2(0x192) EMIT2(0x1d6e) EMIT2(0x1d82)
EMIT2(0x1e1f) EMIT2(0xa799)
return;
case 'g':
case 0x11d:
case 0x11f:
case 0x121:
case 0x123:
case 0x1e5:
case 0x1e7:
case 0x1f5:
case 0x260:
case 0x1d83:
case 0x1e21:
case 0xa7a1:
EMIT2('g') EMIT2(0x11d) EMIT2(0x11f) EMIT2(0x121)
EMIT2(0x123) EMIT2(0x1e5) EMIT2(0x1e7)
EMIT2(0x1f5) EMIT2(0x260) EMIT2(0x1d83)
EMIT2(0x1e21) EMIT2(0xa7a1)
return;
case 'h':
case 0x125:
case 0x127:
case 0x21f:
case 0x1e23:
case 0x1e25:
case 0x1e27:
case 0x1e29:
case 0x1e2b:
case 0x1e96:
case 0x2c68:
case 0xa795:
EMIT2('h') EMIT2(0x125) EMIT2(0x127) EMIT2(0x21f)
EMIT2(0x1e23) EMIT2(0x1e25) EMIT2(0x1e27)
EMIT2(0x1e29) EMIT2(0x1e2b) EMIT2(0x1e96)
EMIT2(0x2c68) EMIT2(0xa795)
return;
case 'i':
case i_grave:
case i_acute:
case i_circumflex:
case i_diaeresis:
case 0x129:
case 0x12b:
case 0x12d:
case 0x12f:
case 0x1d0:
case 0x209:
case 0x20b:
case 0x268:
case 0x1d96:
case 0x1e2d:
case 0x1e2f:
case 0x1ec9:
case 0x1ecb:
EMIT2('i') EMIT2(i_grave) EMIT2(i_acute)
EMIT2(i_circumflex) EMIT2(i_diaeresis)
EMIT2(0x129) EMIT2(0x12b) EMIT2(0x12d)
EMIT2(0x12f) EMIT2(0x1d0) EMIT2(0x209)
EMIT2(0x20b) EMIT2(0x268) EMIT2(0x1d96)
EMIT2(0x1e2d) EMIT2(0x1e2f) EMIT2(0x1ec9)
EMIT2(0x1ecb) EMIT2(0x1ecb)
return;
case 'j':
case 0x135:
case 0x1f0:
case 0x249:
EMIT2('j') EMIT2(0x135) EMIT2(0x1f0) EMIT2(0x249)
return;
case 'k':
case 0x137:
case 0x199:
case 0x1e9:
case 0x1d84:
case 0x1e31:
case 0x1e33:
case 0x1e35:
case 0x2c6a:
case 0xa741:
EMIT2('k') EMIT2(0x137) EMIT2(0x199) EMIT2(0x1e9)
EMIT2(0x1d84) EMIT2(0x1e31) EMIT2(0x1e33)
EMIT2(0x1e35) EMIT2(0x2c6a) EMIT2(0xa741)
return;
case 'l':
case 0x13a:
case 0x13c:
case 0x13e:
case 0x140:
case 0x142:
case 0x19a:
case 0x1e37:
case 0x1e39:
case 0x1e3b:
case 0x1e3d:
case 0x2c61:
EMIT2('l') EMIT2(0x13a) EMIT2(0x13c)
EMIT2(0x13e) EMIT2(0x140) EMIT2(0x142)
EMIT2(0x19a) EMIT2(0x1e37) EMIT2(0x1e39)
EMIT2(0x1e3b) EMIT2(0x1e3d) EMIT2(0x2c61)
return;
case 'm':
case 0x1d6f:
case 0x1e3f:
case 0x1e41:
case 0x1e43:
EMIT2('m') EMIT2(0x1d6f) EMIT2(0x1e3f)
EMIT2(0x1e41) EMIT2(0x1e43)
return;
case 'n':
case n_virguilla:
case 0x144:
case 0x146:
case 0x148:
case 0x149:
case 0x1f9:
case 0x1d70:
case 0x1d87:
case 0x1e45:
case 0x1e47:
case 0x1e49:
case 0x1e4b:
case 0xa7a5:
EMIT2('n') EMIT2(n_virguilla)
EMIT2(0x144) EMIT2(0x146) EMIT2(0x148)
EMIT2(0x149) EMIT2(0x1f9) EMIT2(0x1d70)
EMIT2(0x1d87) EMIT2(0x1e45) EMIT2(0x1e47)
EMIT2(0x1e49) EMIT2(0x1e4b) EMIT2(0xa7a5)
return;
case 'o':
case o_grave:
case o_acute:
case o_circumflex:
case o_virguilla:
case o_diaeresis:
case o_slash:
case 0x14d:
case 0x14f:
case 0x151:
case 0x1a1:
case 0x1d2:
case 0x1eb:
case 0x1ed:
case 0x1ff:
case 0x20d:
case 0x20f:
case 0x22b:
case 0x22d:
case 0x22f:
case 0x231:
case 0x275:
case 0x1e4d:
case 0x1e4f:
case 0x1e51:
case 0x1e53:
case 0x1ecd:
case 0x1ecf:
case 0x1ed1:
case 0x1ed3:
case 0x1ed5:
case 0x1ed7:
case 0x1ed9:
case 0x1edb:
case 0x1edd:
case 0x1edf:
case 0x1ee1:
case 0x1ee3:
EMIT2('o') EMIT2(o_grave) EMIT2(o_acute)
EMIT2(o_circumflex) EMIT2(o_virguilla)
EMIT2(o_diaeresis) EMIT2(o_slash)
EMIT2(0x14d) EMIT2(0x14f) EMIT2(0x151)
EMIT2(0x1a1) EMIT2(0x1d2) EMIT2(0x1eb)
EMIT2(0x1ed) EMIT2(0x1ff) EMIT2(0x20d)
EMIT2(0x20f) EMIT2(0x22b) EMIT2(0x22d)
EMIT2(0x22f) EMIT2(0x231) EMIT2(0x275)
EMIT2(0x1e4d) EMIT2(0x1e4f) EMIT2(0x1e51)
EMIT2(0x1e53) EMIT2(0x1ecd) EMIT2(0x1ecf)
EMIT2(0x1ed1) EMIT2(0x1ed3) EMIT2(0x1ed5)
EMIT2(0x1ed7) EMIT2(0x1ed9) EMIT2(0x1edb)
EMIT2(0x1edd) EMIT2(0x1edf) EMIT2(0x1ee1)
EMIT2(0x1ee3)
return;
case 'p':
case 0x1a5:
case 0x1d71:
case 0x1d7d:
case 0x1d88:
case 0x1e55:
case 0x1e57:
EMIT2('p') EMIT2(0x1a5) EMIT2(0x1d71) EMIT2(0x1d7d)
EMIT2(0x1d88) EMIT2(0x1e55) EMIT2(0x1e57)
return;
case 'q':
case 0x24b:
case 0x2a0:
EMIT2('q') EMIT2(0x24b) EMIT2(0x2a0)
return;
case 'r':
case 0x155:
case 0x157:
case 0x159:
case 0x211:
case 0x213:
case 0x24d:
case 0x27d:
case 0x1d72:
case 0x1d73:
case 0x1d89:
case 0x1e59:
case 0x1e5b:
case 0x1e5d:
case 0x1e5f:
case 0xa7a7:
EMIT2('r') EMIT2(0x155) EMIT2(0x157) EMIT2(0x159)
EMIT2(0x211) EMIT2(0x213) EMIT2(0x24d) EMIT2(0x27d)
EMIT2(0x1d72) EMIT2(0x1d73) EMIT2(0x1d89) EMIT2(0x1e59)
EMIT2(0x1e5b) EMIT2(0x1e5d) EMIT2(0x1e5f) EMIT2(0xa7a7)
return;
case 's':
case 0x15b:
case 0x15d:
case 0x15f:
case 0x161:
case 0x219:
case 0x23f:
case 0x1d74:
case 0x1d8a:
case 0x1e61:
case 0x1e63:
case 0x1e65:
case 0x1e67:
case 0x1e69:
case 0xa7a9:
EMIT2('s') EMIT2(0x15b) EMIT2(0x15d) EMIT2(0x15f)
EMIT2(0x161) EMIT2(0x219) EMIT2(0x23f) EMIT2(0x1d74)
EMIT2(0x1d8a) EMIT2(0x1e61) EMIT2(0x1e63) EMIT2(0x1e65)
EMIT2(0x1e67) EMIT2(0x1e69) EMIT2(0xa7a9)
return;
case 't':
case 0x163:
case 0x165:
case 0x167:
case 0x1ab:
case 0x1ad:
case 0x21b:
case 0x288:
case 0x1d75:
case 0x1e6b:
case 0x1e6d:
case 0x1e6f:
case 0x1e71:
case 0x1e97:
case 0x2c66:
EMIT2('t') EMIT2(0x163) EMIT2(0x165) EMIT2(0x167)
EMIT2(0x1ab) EMIT2(0x1ad) EMIT2(0x21b) EMIT2(0x288)
EMIT2(0x1d75) EMIT2(0x1e6b) EMIT2(0x1e6d) EMIT2(0x1e6f)
EMIT2(0x1e71) EMIT2(0x1e97) EMIT2(0x2c66)
return;
case 'u':
case u_grave:
case u_acute:
case u_circumflex:
case u_diaeresis:
case 0x169:
case 0x16b:
case 0x16d:
case 0x16f:
case 0x171:
case 0x173:
case 0x1b0:
case 0x1d4:
case 0x1d6:
case 0x1d8:
case 0x1da:
case 0x1dc:
case 0x215:
case 0x217:
case 0x289:
case 0x1d7e:
case 0x1d99:
case 0x1e73:
case 0x1e75:
case 0x1e77:
case 0x1e79:
case 0x1e7b:
case 0x1ee5:
case 0x1ee7:
case 0x1ee9:
case 0x1eeb:
case 0x1eed:
case 0x1eef:
case 0x1ef1:
EMIT2('u') EMIT2(u_grave) EMIT2(u_acute)
EMIT2(u_circumflex) EMIT2(u_diaeresis)
EMIT2(0x169) EMIT2(0x16b)
EMIT2(0x16d) EMIT2(0x16f) EMIT2(0x171)
EMIT2(0x173) EMIT2(0x1d6) EMIT2(0x1d8)
EMIT2(0x215) EMIT2(0x217) EMIT2(0x1b0)
EMIT2(0x1d4) EMIT2(0x1da) EMIT2(0x1dc)
EMIT2(0x289) EMIT2(0x1e73) EMIT2(0x1d7e)
EMIT2(0x1d99) EMIT2(0x1e75) EMIT2(0x1e77)
EMIT2(0x1e79) EMIT2(0x1e7b) EMIT2(0x1ee5)
EMIT2(0x1ee7) EMIT2(0x1ee9) EMIT2(0x1eeb)
EMIT2(0x1eed) EMIT2(0x1eef) EMIT2(0x1ef1)
return;
case 'v':
case 0x28b:
case 0x1d8c:
case 0x1e7d:
case 0x1e7f:
EMIT2('v') EMIT2(0x28b) EMIT2(0x1d8c) EMIT2(0x1e7d)
EMIT2(0x1e7f)
return;
case 'w':
case 0x175:
case 0x1e81:
case 0x1e83:
case 0x1e85:
case 0x1e87:
case 0x1e89:
case 0x1e98:
EMIT2('w') EMIT2(0x175) EMIT2(0x1e81) EMIT2(0x1e83)
EMIT2(0x1e85) EMIT2(0x1e87) EMIT2(0x1e89) EMIT2(0x1e98)
return;
case 'x':
case 0x1e8b:
case 0x1e8d:
EMIT2('x') EMIT2(0x1e8b) EMIT2(0x1e8d)
return;
case 'y':
case y_acute:
case y_diaeresis:
case 0x177:
case 0x1b4:
case 0x233:
case 0x24f:
case 0x1e8f:
case 0x1e99:
case 0x1ef3:
case 0x1ef5:
case 0x1ef7:
case 0x1ef9:
EMIT2('y') EMIT2(y_acute) EMIT2(y_diaeresis)
EMIT2(0x177) EMIT2(0x1b4) EMIT2(0x233) EMIT2(0x24f)
EMIT2(0x1e8f) EMIT2(0x1e99) EMIT2(0x1ef3)
EMIT2(0x1ef5) EMIT2(0x1ef7) EMIT2(0x1ef9)
return;
case 'z':
case 0x17a:
case 0x17c:
case 0x17e:
case 0x1b6:
case 0x1d76:
case 0x1d8e:
case 0x1e91:
case 0x1e93:
case 0x1e95:
case 0x2c6c:
EMIT2('z') EMIT2(0x17a) EMIT2(0x17c) EMIT2(0x17e)
EMIT2(0x1b6) EMIT2(0x1d76) EMIT2(0x1d8e) EMIT2(0x1e91)
EMIT2(0x1e93) EMIT2(0x1e95) EMIT2(0x2c6c)
return;
// default: character itself
}
}
EMIT2(c);
#undef EMIT2
}
// Code to parse regular expression.
//
// We try to reuse parsing functions in regexp.c to
// minimize surprise and keep the syntax consistent.
// Parse the lowest level.
//
// An atom can be one of a long list of items. Many atoms match one character
// in the text. It is often an ordinary character or a character class.
// Braces can be used to make a pattern into an atom. The "\z(\)" construct
// is only for syntax highlighting.
//
// atom ::= ordinary-atom
// or \( pattern \)
// or \%( pattern \)
// or \z( pattern \)
static int nfa_regatom(void)
{
int c;
int charclass;
int equiclass;
int collclass;
int got_coll_char;
uint8_t *p;
uint8_t *endp;
uint8_t *old_regparse = (uint8_t *)regparse;
int extra = 0;
int emit_range;
int negated;
int startc = -1;
int save_prev_at_start = prev_at_start;
c = getchr();
switch (c) {
case NUL:
EMSG_RET_FAIL(_(e_nul_found));
case Magic('^'):
EMIT(NFA_BOL);
break;
case Magic('$'):
EMIT(NFA_EOL);
had_eol = true;
break;
case Magic('<'):
EMIT(NFA_BOW);
break;
case Magic('>'):
EMIT(NFA_EOW);
break;
case Magic('_'):
c = no_Magic(getchr());
if (c == NUL) {
EMSG_RET_FAIL(_(e_nul_found));
}
if (c == '^') { // "\_^" is start-of-line
EMIT(NFA_BOL);
break;
}
if (c == '$') { // "\_$" is end-of-line
EMIT(NFA_EOL);
had_eol = true;
break;
}
extra = NFA_ADD_NL;
// "\_[" is collection plus newline
if (c == '[') {
goto collection;
}
// "\_x" is character class plus newline
FALLTHROUGH;
// Character classes.
case Magic('.'):
case Magic('i'):
case Magic('I'):
case Magic('k'):
case Magic('K'):
case Magic('f'):
case Magic('F'):
case Magic('p'):
case Magic('P'):
case Magic('s'):
case Magic('S'):
case Magic('d'):
case Magic('D'):
case Magic('x'):
case Magic('X'):
case Magic('o'):
case Magic('O'):
case Magic('w'):
case Magic('W'):
case Magic('h'):
case Magic('H'):
case Magic('a'):
case Magic('A'):
case Magic('l'):
case Magic('L'):
case Magic('u'):
case Magic('U'):
p = (uint8_t *)vim_strchr((char *)classchars, no_Magic(c));
if (p == NULL) {
if (extra == NFA_ADD_NL) {
semsg(_(e_ill_char_class), (int64_t)c);
rc_did_emsg = true;
return FAIL;
}
siemsg("INTERNAL: Unknown character class char: %" PRId64, (int64_t)c);
return FAIL;
}
// When '.' is followed by a composing char ignore the dot, so that
// the composing char is matched here.
if (c == Magic('.') && utf_iscomposing(peekchr())) {
old_regparse = (uint8_t *)regparse;
c = getchr();
goto nfa_do_multibyte;
}
EMIT(nfa_classcodes[p - classchars]);
if (extra == NFA_ADD_NL) {
EMIT(NFA_NEWL);
EMIT(NFA_OR);
regflags |= RF_HASNL;
}
break;
case Magic('n'):
if (reg_string) {
// In a string "\n" matches a newline character.
EMIT(NL);
} else {
// In buffer text "\n" matches the end of a line.
EMIT(NFA_NEWL);
regflags |= RF_HASNL;
}
break;
case Magic('('):
if (nfa_reg(REG_PAREN) == FAIL) {
return FAIL; // cascaded error
}
break;
case Magic('|'):
case Magic('&'):
case Magic(')'):
semsg(_(e_misplaced), (char)no_Magic(c));
return FAIL;
case Magic('='):
case Magic('?'):
case Magic('+'):
case Magic('@'):
case Magic('*'):
case Magic('{'):
// these should follow an atom, not form an atom
semsg(_(e_misplaced), (char)no_Magic(c));
return FAIL;
case Magic('~'): {
uint8_t *lp;
// Previous substitute pattern.
// Generated as "\%(pattern\)".
if (reg_prev_sub == NULL) {
emsg(_(e_nopresub));
return FAIL;
}
for (lp = (uint8_t *)reg_prev_sub; *lp != NUL; lp += utf_ptr2len((char *)lp)) {
EMIT(utf_ptr2char((char *)lp));
if (lp != (uint8_t *)reg_prev_sub) {
EMIT(NFA_CONCAT);
}
}
EMIT(NFA_NOPEN);
break;
}
case Magic('1'):
case Magic('2'):
case Magic('3'):
case Magic('4'):
case Magic('5'):
case Magic('6'):
case Magic('7'):
case Magic('8'):
case Magic('9'): {
int refnum = no_Magic(c) - '1';
if (!seen_endbrace(refnum + 1)) {
return FAIL;
}
EMIT(NFA_BACKREF1 + refnum);
rex.nfa_has_backref = true;
}
break;
case Magic('z'):
c = no_Magic(getchr());
switch (c) {
case 's':
EMIT(NFA_ZSTART);
if (!re_mult_next("\\zs")) {
return false;
}
break;
case 'e':
EMIT(NFA_ZEND);
rex.nfa_has_zend = true;
if (!re_mult_next("\\zs")) {
return false;
}
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
// \z1...\z9
if ((reg_do_extmatch & REX_USE) == 0) {
EMSG_RET_FAIL(_(e_z1_not_allowed));
}
EMIT(NFA_ZREF1 + (no_Magic(c) - '1'));
// No need to set rex.nfa_has_backref, the sub-matches don't
// change when \z1 .. \z9 matches or not.
re_has_z = REX_USE;
break;
case '(':
// \z(
if (reg_do_extmatch != REX_SET) {
EMSG_RET_FAIL(_(e_z_not_allowed));
}
if (nfa_reg(REG_ZPAREN) == FAIL) {
return FAIL; // cascaded error
}
re_has_z = REX_SET;
break;
default:
semsg(_("E867: (NFA) Unknown operator '\\z%c'"),
no_Magic(c));
return FAIL;
}
break;
case Magic('%'):
c = no_Magic(getchr());
switch (c) {
// () without a back reference
case '(':
if (nfa_reg(REG_NPAREN) == FAIL) {
return FAIL;
}
EMIT(NFA_NOPEN);
break;
case 'd': // %d123 decimal
case 'o': // %o123 octal
case 'x': // %xab hex 2
case 'u': // %uabcd hex 4
case 'U': // %U1234abcd hex 8
{
int64_t nr;
switch (c) {
case 'd':
nr = getdecchrs(); break;
case 'o':
nr = getoctchrs(); break;
case 'x':
nr = gethexchrs(2); break;
case 'u':
nr = gethexchrs(4); break;
case 'U':
nr = gethexchrs(8); break;
default:
nr = -1; break;
}
if (nr < 0 || nr > INT_MAX) {
EMSG2_RET_FAIL(_("E678: Invalid character after %s%%[dxouU]"),
reg_magic == MAGIC_ALL);
}
// A NUL is stored in the text as NL
// TODO(vim): what if a composing character follows?
EMIT(nr == 0 ? 0x0a : (int)nr);
}
break;
// Catch \%^ and \%$ regardless of where they appear in the
// pattern -- regardless of whether or not it makes sense.
case '^':
EMIT(NFA_BOF);
break;
case '$':
EMIT(NFA_EOF);
break;
case '#':
if (regparse[0] == '=' && regparse[1] >= 48
&& regparse[1] <= 50) {
// misplaced \%#=1
semsg(_(e_atom_engine_must_be_at_start_of_pattern), regparse[1]);
return FAIL;
}
EMIT(NFA_CURSOR);
break;
case 'V':
EMIT(NFA_VISUAL);
break;
case 'C':
EMIT(NFA_ANY_COMPOSING);
break;
case '[': {
int n;
// \%[abc]
for (n = 0; (c = peekchr()) != ']'; n++) {
if (c == NUL) {
EMSG2_RET_FAIL(_(e_missing_sb),
reg_magic == MAGIC_ALL);
}
// recursive call!
if (nfa_regatom() == FAIL) {
return FAIL;
}
}
(void)getchr(); // get the ]
if (n == 0) {
EMSG2_RET_FAIL(_(e_empty_sb), reg_magic == MAGIC_ALL);
}
EMIT(NFA_OPT_CHARS);
EMIT(n);
// Emit as "\%(\%[abc]\)" to be able to handle
// "\%[abc]*" which would cause the empty string to be
// matched an unlimited number of times. NFA_NOPEN is
// added only once at a position, while NFA_SPLIT is
// added multiple times. This is more efficient than
// not allowing NFA_SPLIT multiple times, it is used
// a lot.
EMIT(NFA_NOPEN);
break;
}
default: {
int64_t n = 0;
const int cmp = c;
bool cur = false;
bool got_digit = false;
if (c == '<' || c == '>') {
c = getchr();
}
if (no_Magic(c) == '.') {
cur = true;
c = getchr();
}
while (ascii_isdigit(c)) {
if (cur) {
semsg(_(e_regexp_number_after_dot_pos_search_chr), no_Magic(c));
return FAIL;
}
if (n > (INT32_MAX - (c - '0')) / 10) {
// overflow.
emsg(_(e_value_too_large));
return FAIL;
}
n = n * 10 + (c - '0');
c = getchr();
got_digit = true;
}
if (c == 'l' || c == 'c' || c == 'v') {
int32_t limit = INT32_MAX;
if (!cur && !got_digit) {
semsg(_(e_nfa_regexp_missing_value_in_chr), no_Magic(c));
return FAIL;
}
if (c == 'l') {
if (cur) {
n = curwin->w_cursor.lnum;
}
// \%{n}l \%{n}<l \%{n}>l
EMIT(cmp == '<' ? NFA_LNUM_LT
: cmp == '>' ? NFA_LNUM_GT : NFA_LNUM);
if (save_prev_at_start) {
at_start = true;
}
} else if (c == 'c') {
if (cur) {
n = curwin->w_cursor.col;
n++;
}
// \%{n}c \%{n}<c \%{n}>c
EMIT(cmp == '<' ? NFA_COL_LT
: cmp == '>' ? NFA_COL_GT : NFA_COL);
} else {
if (cur) {
colnr_T vcol = 0;
getvvcol(curwin, &curwin->w_cursor, NULL, NULL, &vcol);
n = ++vcol;
}
// \%{n}v \%{n}<v \%{n}>v
EMIT(cmp == '<' ? NFA_VCOL_LT
: cmp == '>' ? NFA_VCOL_GT : NFA_VCOL);
limit = INT32_MAX / MB_MAXBYTES;
}
if (n >= limit) {
emsg(_(e_value_too_large));
return FAIL;
}
EMIT((int)n);
break;
} else if (c == '\'' && n == 0) {
// \%'m \%<'m \%>'m
EMIT(cmp == '<' ? NFA_MARK_LT
: cmp == '>' ? NFA_MARK_GT : NFA_MARK);
EMIT(getchr());
break;
}
}
semsg(_("E867: (NFA) Unknown operator '\\%%%c'"),
no_Magic(c));
return FAIL;
}
break;
case Magic('['):
collection:
// [abc] uses NFA_START_COLL - NFA_END_COLL
// [^abc] uses NFA_START_NEG_COLL - NFA_END_NEG_COLL
// Each character is produced as a regular state, using
// NFA_CONCAT to bind them together.
// Besides normal characters there can be:
// - character classes NFA_CLASS_*
// - ranges, two characters followed by NFA_RANGE.
p = (uint8_t *)regparse;
endp = (uint8_t *)skip_anyof((char *)p);
if (*endp == ']') {
// Try to reverse engineer character classes. For example,
// recognize that [0-9] stands for \d and [A-Za-z_] for \h,
// and perform the necessary substitutions in the NFA.
int result = nfa_recognize_char_class((uint8_t *)regparse, endp, extra == NFA_ADD_NL);
if (result != FAIL) {
if (result >= NFA_FIRST_NL && result <= NFA_LAST_NL) {
EMIT(result - NFA_ADD_NL);
EMIT(NFA_NEWL);
EMIT(NFA_OR);
} else {
EMIT(result);
}
regparse = (char *)endp;
MB_PTR_ADV(regparse);
return OK;
}
// Failed to recognize a character class. Use the simple
// version that turns [abc] into 'a' OR 'b' OR 'c'
negated = false;
if (*regparse == '^') { // negated range
negated = true;
MB_PTR_ADV(regparse);
EMIT(NFA_START_NEG_COLL);
} else {
EMIT(NFA_START_COLL);
}
if (*regparse == '-') {
startc = '-';
EMIT(startc);
EMIT(NFA_CONCAT);
MB_PTR_ADV(regparse);
}
// Emit the OR branches for each character in the []
emit_range = false;
while ((uint8_t *)regparse < endp) {
int oldstartc = startc;
startc = -1;
got_coll_char = false;
if (*regparse == '[') {
// Check for [: :], [= =], [. .]
equiclass = collclass = 0;
charclass = get_char_class(&regparse);
if (charclass == CLASS_NONE) {
equiclass = get_equi_class(&regparse);
if (equiclass == 0) {
collclass = get_coll_element(&regparse);
}
}
// Character class like [:alpha:]
if (charclass != CLASS_NONE) {
switch (charclass) {
case CLASS_ALNUM:
EMIT(NFA_CLASS_ALNUM);
break;
case CLASS_ALPHA:
EMIT(NFA_CLASS_ALPHA);
break;
case CLASS_BLANK:
EMIT(NFA_CLASS_BLANK);
break;
case CLASS_CNTRL:
EMIT(NFA_CLASS_CNTRL);
break;
case CLASS_DIGIT:
EMIT(NFA_CLASS_DIGIT);
break;
case CLASS_GRAPH:
EMIT(NFA_CLASS_GRAPH);
break;
case CLASS_LOWER:
wants_nfa = true;
EMIT(NFA_CLASS_LOWER);
break;
case CLASS_PRINT:
EMIT(NFA_CLASS_PRINT);
break;
case CLASS_PUNCT:
EMIT(NFA_CLASS_PUNCT);
break;
case CLASS_SPACE:
EMIT(NFA_CLASS_SPACE);
break;
case CLASS_UPPER:
wants_nfa = true;
EMIT(NFA_CLASS_UPPER);
break;
case CLASS_XDIGIT:
EMIT(NFA_CLASS_XDIGIT);
break;
case CLASS_TAB:
EMIT(NFA_CLASS_TAB);
break;
case CLASS_RETURN:
EMIT(NFA_CLASS_RETURN);
break;
case CLASS_BACKSPACE:
EMIT(NFA_CLASS_BACKSPACE);
break;
case CLASS_ESCAPE:
EMIT(NFA_CLASS_ESCAPE);
break;
case CLASS_IDENT:
EMIT(NFA_CLASS_IDENT);
break;
case CLASS_KEYWORD:
EMIT(NFA_CLASS_KEYWORD);
break;
case CLASS_FNAME:
EMIT(NFA_CLASS_FNAME);
break;
}
EMIT(NFA_CONCAT);
continue;
}
// Try equivalence class [=a=] and the like
if (equiclass != 0) {
nfa_emit_equi_class(equiclass);
continue;
}
// Try collating class like [. .]
if (collclass != 0) {
startc = collclass; // allow [.a.]-x as a range
// Will emit the proper atom at the end of the
// while loop.
}
}
// Try a range like 'a-x' or '\t-z'. Also allows '-' as a
// start character.
if (*regparse == '-' && oldstartc != -1) {
emit_range = true;
startc = oldstartc;
MB_PTR_ADV(regparse);
continue; // reading the end of the range
}
// Now handle simple and escaped characters.
// Only "\]", "\^", "\]" and "\\" are special in Vi. Vim
// accepts "\t", "\e", etc., but only when the 'l' flag in
// 'cpoptions' is not included.
if (*regparse == '\\'
&& (uint8_t *)regparse + 1 <= endp
&& (vim_strchr(REGEXP_INRANGE, (uint8_t)regparse[1]) != NULL
|| (!reg_cpo_lit
&& vim_strchr(REGEXP_ABBR, (uint8_t)regparse[1])
!= NULL))) {
MB_PTR_ADV(regparse);
if (*regparse == 'n') {
startc = (reg_string || emit_range || regparse[1] == '-')
? NL : NFA_NEWL;
} else if (*regparse == 'd'
|| *regparse == 'o'
|| *regparse == 'x'
|| *regparse == 'u'
|| *regparse == 'U') {
// TODO(RE): This needs more testing
startc = coll_get_char();
got_coll_char = true;
MB_PTR_BACK(old_regparse, regparse);
} else {
// \r,\t,\e,\b
startc = backslash_trans(*regparse);
}
}
// Normal printable char
if (startc == -1) {
startc = utf_ptr2char(regparse);
}
// Previous char was '-', so this char is end of range.
if (emit_range) {
int endc = startc;
startc = oldstartc;
if (startc > endc) {
EMSG_RET_FAIL(_(e_reverse_range));
}
if (endc > startc + 2) {
// Emit a range instead of the sequence of
// individual characters.
if (startc == 0) {
// \x00 is translated to \x0a, start at \x01.
EMIT(1);
} else {
post_ptr--; // remove NFA_CONCAT
}
EMIT(endc);
EMIT(NFA_RANGE);
EMIT(NFA_CONCAT);
} else if (utf_char2len(startc) > 1
|| utf_char2len(endc) > 1) {
// Emit the characters in the range.
// "startc" was already emitted, so skip it.
for (c = startc + 1; c <= endc; c++) {
EMIT(c);
EMIT(NFA_CONCAT);
}
} else {
// Emit the range. "startc" was already emitted, so
// skip it.
for (c = startc + 1; c <= endc; c++) {
EMIT(c);
EMIT(NFA_CONCAT);
}
}
emit_range = false;
startc = -1;
} else {
// This char (startc) is not part of a range. Just
// emit it.
// Normally, simply emit startc. But if we get char
// code=0 from a collating char, then replace it with
// 0x0a.
// This is needed to completely mimic the behaviour of
// the backtracking engine.
if (startc == NFA_NEWL) {
// Line break can't be matched as part of the
// collection, add an OR below. But not for negated
// range.
if (!negated) {
extra = NFA_ADD_NL;
}
} else {
if (got_coll_char == true && startc == 0) {
EMIT(0x0a);
EMIT(NFA_CONCAT);
} else {
EMIT(startc);
if (utf_ptr2len(regparse) == utfc_ptr2len(regparse)) {
EMIT(NFA_CONCAT);
}
}
}
}
int plen;
if (utf_ptr2len(regparse) != (plen = utfc_ptr2len(regparse))) {
int i = utf_ptr2len(regparse);
c = utf_ptr2char(regparse + i);
// Add composing characters
while (true) {
if (c == 0) {
// \x00 is translated to \x0a, start at \x01.
EMIT(1);
} else {
EMIT(c);
}
EMIT(NFA_CONCAT);
if ((i += utf_char2len(c)) >= plen) {
break;
}
c = utf_ptr2char(regparse + i);
}
EMIT(NFA_COMPOSING);
EMIT(NFA_CONCAT);
}
MB_PTR_ADV(regparse);
} // while (p < endp)
MB_PTR_BACK(old_regparse, regparse);
if (*regparse == '-') { // if last, '-' is just a char
EMIT('-');
EMIT(NFA_CONCAT);
}
// skip the trailing ]
regparse = (char *)endp;
MB_PTR_ADV(regparse);
// Mark end of the collection.
if (negated == true) {
EMIT(NFA_END_NEG_COLL);
} else {
EMIT(NFA_END_COLL);
}
// \_[] also matches \n but it's not negated
if (extra == NFA_ADD_NL) {
EMIT(reg_string ? NL : NFA_NEWL);
EMIT(NFA_OR);
}
return OK;
} // if exists closing ]
if (reg_strict) {
EMSG_RET_FAIL(_(e_missingbracket));
}
FALLTHROUGH;
default: {
int plen;
nfa_do_multibyte:
// plen is length of current char with composing chars
if (utf_char2len(c) != (plen = utfc_ptr2len((char *)old_regparse))
|| utf_iscomposing(c)) {
int i = 0;
// A base character plus composing characters, or just one
// or more composing characters.
// This requires creating a separate atom as if enclosing
// the characters in (), where NFA_COMPOSING is the ( and
// NFA_END_COMPOSING is the ). Note that right now we are
// building the postfix form, not the NFA itself;
// a composing char could be: a, b, c, NFA_COMPOSING
// where 'b' and 'c' are chars with codes > 256. */
while (true) {
EMIT(c);
if (i > 0) {
EMIT(NFA_CONCAT);
}
if ((i += utf_char2len(c)) >= plen) {
break;
}
c = utf_ptr2char((char *)old_regparse + i);
}
EMIT(NFA_COMPOSING);
regparse = (char *)old_regparse + plen;
} else {
c = no_Magic(c);
EMIT(c);
}
return OK;
}
}
return OK;
}
// Parse something followed by possible [*+=].
//
// A piece is an atom, possibly followed by a multi, an indication of how many
// times the atom can be matched. Example: "a*" matches any sequence of "a"
// characters: "", "a", "aa", etc.
//
// piece ::= atom
// or atom multi
static int nfa_regpiece(void)
{
int i;
int op;
int ret;
int minval, maxval;
bool greedy = true; // Braces are prefixed with '-' ?
parse_state_T old_state;
parse_state_T new_state;
int64_t c2;
int old_post_pos;
int my_post_start;
int quest;
// Save the current parse state, so that we can use it if <atom>{m,n} is
// next.
save_parse_state(&old_state);
// store current pos in the postfix form, for \{m,n} involving 0s
my_post_start = (int)(post_ptr - post_start);
ret = nfa_regatom();
if (ret == FAIL) {
return FAIL; // cascaded error
}
op = peekchr();
if (re_multi_type(op) == NOT_MULTI) {
return OK;
}
skipchr();
switch (op) {
case Magic('*'):
EMIT(NFA_STAR);
break;
case Magic('+'):
// Trick: Normally, (a*)\+ would match the whole input "aaa". The
// first and only submatch would be "aaa". But the backtracking
// engine interprets the plus as "try matching one more time", and
// a* matches a second time at the end of the input, the empty
// string.
// The submatch will be the empty string.
//
// In order to be consistent with the old engine, we replace
// <atom>+ with <atom><atom>*
restore_parse_state(&old_state);
curchr = -1;
if (nfa_regatom() == FAIL) {
return FAIL;
}
EMIT(NFA_STAR);
EMIT(NFA_CONCAT);
skipchr(); // skip the \+
break;
case Magic('@'):
c2 = getdecchrs();
op = no_Magic(getchr());
i = 0;
switch (op) {
case '=':
// \@=
i = NFA_PREV_ATOM_NO_WIDTH;
break;
case '!':
// \@!
i = NFA_PREV_ATOM_NO_WIDTH_NEG;
break;
case '<':
op = no_Magic(getchr());
if (op == '=') {
// \@<=
i = NFA_PREV_ATOM_JUST_BEFORE;
} else if (op == '!') {
// \@<!
i = NFA_PREV_ATOM_JUST_BEFORE_NEG;
}
break;
case '>':
// \@>
i = NFA_PREV_ATOM_LIKE_PATTERN;
break;
}
if (i == 0) {
semsg(_("E869: (NFA) Unknown operator '\\@%c'"), op);
return FAIL;
}
EMIT(i);
if (i == NFA_PREV_ATOM_JUST_BEFORE
|| i == NFA_PREV_ATOM_JUST_BEFORE_NEG) {
EMIT((int)c2);
}
break;
case Magic('?'):
case Magic('='):
EMIT(NFA_QUEST);
break;
case Magic('{'):
// a{2,5} will expand to 'aaa?a?a?'
// a{-1,3} will expand to 'aa??a??', where ?? is the nongreedy
// version of '?'
// \v(ab){2,3} will expand to '(ab)(ab)(ab)?', where all the
// parenthesis have the same id
greedy = true;
c2 = peekchr();
if (c2 == '-' || c2 == Magic('-')) {
skipchr();
greedy = false;
}
if (!read_limits(&minval, &maxval)) {
EMSG_RET_FAIL(_("E870: (NFA regexp) Error reading repetition limits"));
}
// <atom>{0,inf}, <atom>{0,} and <atom>{} are equivalent to
// <atom>*
if (minval == 0 && maxval == MAX_LIMIT) {
if (greedy) {
// \{}, \{0,}
EMIT(NFA_STAR);
} else {
// \{-}, \{-0,}
EMIT(NFA_STAR_NONGREEDY);
}
break;
}
// Special case: x{0} or x{-0}
if (maxval == 0) {
// Ignore result of previous call to nfa_regatom()
post_ptr = post_start + my_post_start;
// NFA_EMPTY is 0-length and works everywhere
EMIT(NFA_EMPTY);
return OK;
}
// The engine is very inefficient (uses too many states) when the
// maximum is much larger than the minimum and when the maximum is
// large. However, when maxval is MAX_LIMIT, it is okay, as this
// will emit NFA_STAR.
// Bail out if we can use the other engine, but only, when the
// pattern does not need the NFA engine like (e.g. [[:upper:]]\{2,\}
// does not work with characters > 8 bit with the BT engine)
if ((nfa_re_flags & RE_AUTO)
&& (maxval > 500 || maxval > minval + 200)
&& (maxval != MAX_LIMIT && minval < 200)
&& !wants_nfa) {
return FAIL;
}
// Ignore previous call to nfa_regatom()
post_ptr = post_start + my_post_start;
// Save parse state after the repeated atom and the \{}
save_parse_state(&new_state);
quest = (greedy == true ? NFA_QUEST : NFA_QUEST_NONGREEDY);
for (i = 0; i < maxval; i++) {
// Goto beginning of the repeated atom
restore_parse_state(&old_state);
old_post_pos = (int)(post_ptr - post_start);
if (nfa_regatom() == FAIL) {
return FAIL;
}
// after "minval" times, atoms are optional
if (i + 1 > minval) {
if (maxval == MAX_LIMIT) {
if (greedy) {
EMIT(NFA_STAR);
} else {
EMIT(NFA_STAR_NONGREEDY);
}
} else {
EMIT(quest);
}
}
if (old_post_pos != my_post_start) {
EMIT(NFA_CONCAT);
}
if (i + 1 > minval && maxval == MAX_LIMIT) {
break;
}
}
// Go to just after the repeated atom and the \{}
restore_parse_state(&new_state);
curchr = -1;
break;
default:
break;
} // end switch
if (re_multi_type(peekchr()) != NOT_MULTI) {
// Can't have a multi follow a multi.
EMSG_RET_FAIL(_("E871: (NFA regexp) Can't have a multi follow a multi"));
}
return OK;
}
// Parse one or more pieces, concatenated. It matches a match for the
// first piece, followed by a match for the second piece, etc. Example:
// "f[0-9]b", first matches "f", then a digit and then "b".
//
// concat ::= piece
// or piece piece
// or piece piece piece
// etc.
static int nfa_regconcat(void)
{
bool cont = true;
bool first = true;
while (cont) {
switch (peekchr()) {
case NUL:
case Magic('|'):
case Magic('&'):
case Magic(')'):
cont = false;
break;
case Magic('Z'):
regflags |= RF_ICOMBINE;
skipchr_keepstart();
break;
case Magic('c'):
regflags |= RF_ICASE;
skipchr_keepstart();
break;
case Magic('C'):
regflags |= RF_NOICASE;
skipchr_keepstart();
break;
case Magic('v'):
reg_magic = MAGIC_ALL;
skipchr_keepstart();
curchr = -1;
break;
case Magic('m'):
reg_magic = MAGIC_ON;
skipchr_keepstart();
curchr = -1;
break;
case Magic('M'):
reg_magic = MAGIC_OFF;
skipchr_keepstart();
curchr = -1;
break;
case Magic('V'):
reg_magic = MAGIC_NONE;
skipchr_keepstart();
curchr = -1;
break;
default:
if (nfa_regpiece() == FAIL) {
return FAIL;
}
if (first == false) {
EMIT(NFA_CONCAT);
} else {
first = false;
}
break;
}
}
return OK;
}
// Parse a branch, one or more concats, separated by "\&". It matches the
// last concat, but only if all the preceding concats also match at the same
// position. Examples:
// "foobeep\&..." matches "foo" in "foobeep".
// ".*Peter\&.*Bob" matches in a line containing both "Peter" and "Bob"
//
// branch ::= concat
// or concat \& concat
// or concat \& concat \& concat
// etc.
static int nfa_regbranch(void)
{
int old_post_pos;
old_post_pos = (int)(post_ptr - post_start);
// First branch, possibly the only one
if (nfa_regconcat() == FAIL) {
return FAIL;
}
// Try next concats
while (peekchr() == Magic('&')) {
skipchr();
// if concat is empty do emit a node
if (old_post_pos == (int)(post_ptr - post_start)) {
EMIT(NFA_EMPTY);
}
EMIT(NFA_NOPEN);
EMIT(NFA_PREV_ATOM_NO_WIDTH);
old_post_pos = (int)(post_ptr - post_start);
if (nfa_regconcat() == FAIL) {
return FAIL;
}
// if concat is empty do emit a node
if (old_post_pos == (int)(post_ptr - post_start)) {
EMIT(NFA_EMPTY);
}
EMIT(NFA_CONCAT);
}
// if a branch is empty, emit one node for it
if (old_post_pos == (int)(post_ptr - post_start)) {
EMIT(NFA_EMPTY);
}
return OK;
}
/// Parse a pattern, one or more branches, separated by "\|". It matches
/// anything that matches one of the branches. Example: "foo\|beep" matches
/// "foo" and matches "beep". If more than one branch matches, the first one
/// is used.
///
/// pattern ::= branch
/// or branch \| branch
/// or branch \| branch \| branch
/// etc.
///
/// @param paren REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN
static int nfa_reg(int paren)
{
int parno = 0;
if (paren == REG_PAREN) {
if (regnpar >= NSUBEXP) { // Too many `('
EMSG_RET_FAIL(_("E872: (NFA regexp) Too many '('"));
}
parno = regnpar++;
} else if (paren == REG_ZPAREN) {
// Make a ZOPEN node.
if (regnzpar >= NSUBEXP) {
EMSG_RET_FAIL(_("E879: (NFA regexp) Too many \\z("));
}
parno = regnzpar++;
}
if (nfa_regbranch() == FAIL) {
return FAIL; // cascaded error
}
while (peekchr() == Magic('|')) {
skipchr();
if (nfa_regbranch() == FAIL) {
return FAIL; // cascaded error
}
EMIT(NFA_OR);
}
// Check for proper termination.
if (paren != REG_NOPAREN && getchr() != Magic(')')) {
if (paren == REG_NPAREN) {
EMSG2_RET_FAIL(_(e_unmatchedpp), reg_magic == MAGIC_ALL);
} else {
EMSG2_RET_FAIL(_(e_unmatchedp), reg_magic == MAGIC_ALL);
}
} else if (paren == REG_NOPAREN && peekchr() != NUL) {
if (peekchr() == Magic(')')) {
EMSG2_RET_FAIL(_(e_unmatchedpar), reg_magic == MAGIC_ALL);
} else {
EMSG_RET_FAIL(_("E873: (NFA regexp) proper termination error"));
}
}
// Here we set the flag allowing back references to this set of
// parentheses.
if (paren == REG_PAREN) {
had_endbrace[parno] = true; // have seen the close paren
EMIT(NFA_MOPEN + parno);
} else if (paren == REG_ZPAREN) {
EMIT(NFA_ZOPEN + parno);
}
return OK;
}
#ifdef REGEXP_DEBUG
static uint8_t code[50];
static void nfa_set_code(int c)
{
int addnl = false;
if (c >= NFA_FIRST_NL && c <= NFA_LAST_NL) {
addnl = true;
c -= NFA_ADD_NL;
}
STRCPY(code, "");
switch (c) {
case NFA_MATCH:
STRCPY(code, "NFA_MATCH "); break;
case NFA_SPLIT:
STRCPY(code, "NFA_SPLIT "); break;
case NFA_CONCAT:
STRCPY(code, "NFA_CONCAT "); break;
case NFA_NEWL:
STRCPY(code, "NFA_NEWL "); break;
case NFA_ZSTART:
STRCPY(code, "NFA_ZSTART"); break;
case NFA_ZEND:
STRCPY(code, "NFA_ZEND"); break;
case NFA_BACKREF1:
STRCPY(code, "NFA_BACKREF1"); break;
case NFA_BACKREF2:
STRCPY(code, "NFA_BACKREF2"); break;
case NFA_BACKREF3:
STRCPY(code, "NFA_BACKREF3"); break;
case NFA_BACKREF4:
STRCPY(code, "NFA_BACKREF4"); break;
case NFA_BACKREF5:
STRCPY(code, "NFA_BACKREF5"); break;
case NFA_BACKREF6:
STRCPY(code, "NFA_BACKREF6"); break;
case NFA_BACKREF7:
STRCPY(code, "NFA_BACKREF7"); break;
case NFA_BACKREF8:
STRCPY(code, "NFA_BACKREF8"); break;
case NFA_BACKREF9:
STRCPY(code, "NFA_BACKREF9"); break;
case NFA_ZREF1:
STRCPY(code, "NFA_ZREF1"); break;
case NFA_ZREF2:
STRCPY(code, "NFA_ZREF2"); break;
case NFA_ZREF3:
STRCPY(code, "NFA_ZREF3"); break;
case NFA_ZREF4:
STRCPY(code, "NFA_ZREF4"); break;
case NFA_ZREF5:
STRCPY(code, "NFA_ZREF5"); break;
case NFA_ZREF6:
STRCPY(code, "NFA_ZREF6"); break;
case NFA_ZREF7:
STRCPY(code, "NFA_ZREF7"); break;
case NFA_ZREF8:
STRCPY(code, "NFA_ZREF8"); break;
case NFA_ZREF9:
STRCPY(code, "NFA_ZREF9"); break;
case NFA_SKIP:
STRCPY(code, "NFA_SKIP"); break;
case NFA_PREV_ATOM_NO_WIDTH:
STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH"); break;
case NFA_PREV_ATOM_NO_WIDTH_NEG:
STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH_NEG"); break;
case NFA_PREV_ATOM_JUST_BEFORE:
STRCPY(code, "NFA_PREV_ATOM_JUST_BEFORE"); break;
case NFA_PREV_ATOM_JUST_BEFORE_NEG:
STRCPY(code, "NFA_PREV_ATOM_JUST_BEFORE_NEG"); break;
case NFA_PREV_ATOM_LIKE_PATTERN:
STRCPY(code, "NFA_PREV_ATOM_LIKE_PATTERN"); break;
case NFA_NOPEN:
STRCPY(code, "NFA_NOPEN"); break;
case NFA_NCLOSE:
STRCPY(code, "NFA_NCLOSE"); break;
case NFA_START_INVISIBLE:
STRCPY(code, "NFA_START_INVISIBLE"); break;
case NFA_START_INVISIBLE_FIRST:
STRCPY(code, "NFA_START_INVISIBLE_FIRST"); break;
case NFA_START_INVISIBLE_NEG:
STRCPY(code, "NFA_START_INVISIBLE_NEG"); break;
case NFA_START_INVISIBLE_NEG_FIRST:
STRCPY(code, "NFA_START_INVISIBLE_NEG_FIRST"); break;
case NFA_START_INVISIBLE_BEFORE:
STRCPY(code, "NFA_START_INVISIBLE_BEFORE"); break;
case NFA_START_INVISIBLE_BEFORE_FIRST:
STRCPY(code, "NFA_START_INVISIBLE_BEFORE_FIRST"); break;
case NFA_START_INVISIBLE_BEFORE_NEG:
STRCPY(code, "NFA_START_INVISIBLE_BEFORE_NEG"); break;
case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
STRCPY(code, "NFA_START_INVISIBLE_BEFORE_NEG_FIRST"); break;
case NFA_START_PATTERN:
STRCPY(code, "NFA_START_PATTERN"); break;
case NFA_END_INVISIBLE:
STRCPY(code, "NFA_END_INVISIBLE"); break;
case NFA_END_INVISIBLE_NEG:
STRCPY(code, "NFA_END_INVISIBLE_NEG"); break;
case NFA_END_PATTERN:
STRCPY(code, "NFA_END_PATTERN"); break;
case NFA_COMPOSING:
STRCPY(code, "NFA_COMPOSING"); break;
case NFA_END_COMPOSING:
STRCPY(code, "NFA_END_COMPOSING"); break;
case NFA_OPT_CHARS:
STRCPY(code, "NFA_OPT_CHARS"); break;
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
STRCPY(code, "NFA_MOPEN(x)");
code[10] = c - NFA_MOPEN + '0';
break;
case NFA_MCLOSE:
case NFA_MCLOSE1:
case NFA_MCLOSE2:
case NFA_MCLOSE3:
case NFA_MCLOSE4:
case NFA_MCLOSE5:
case NFA_MCLOSE6:
case NFA_MCLOSE7:
case NFA_MCLOSE8:
case NFA_MCLOSE9:
STRCPY(code, "NFA_MCLOSE(x)");
code[11] = c - NFA_MCLOSE + '0';
break;
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
STRCPY(code, "NFA_ZOPEN(x)");
code[10] = c - NFA_ZOPEN + '0';
break;
case NFA_ZCLOSE:
case NFA_ZCLOSE1:
case NFA_ZCLOSE2:
case NFA_ZCLOSE3:
case NFA_ZCLOSE4:
case NFA_ZCLOSE5:
case NFA_ZCLOSE6:
case NFA_ZCLOSE7:
case NFA_ZCLOSE8:
case NFA_ZCLOSE9:
STRCPY(code, "NFA_ZCLOSE(x)");
code[11] = c - NFA_ZCLOSE + '0';
break;
case NFA_EOL:
STRCPY(code, "NFA_EOL "); break;
case NFA_BOL:
STRCPY(code, "NFA_BOL "); break;
case NFA_EOW:
STRCPY(code, "NFA_EOW "); break;
case NFA_BOW:
STRCPY(code, "NFA_BOW "); break;
case NFA_EOF:
STRCPY(code, "NFA_EOF "); break;
case NFA_BOF:
STRCPY(code, "NFA_BOF "); break;
case NFA_LNUM:
STRCPY(code, "NFA_LNUM "); break;
case NFA_LNUM_GT:
STRCPY(code, "NFA_LNUM_GT "); break;
case NFA_LNUM_LT:
STRCPY(code, "NFA_LNUM_LT "); break;
case NFA_COL:
STRCPY(code, "NFA_COL "); break;
case NFA_COL_GT:
STRCPY(code, "NFA_COL_GT "); break;
case NFA_COL_LT:
STRCPY(code, "NFA_COL_LT "); break;
case NFA_VCOL:
STRCPY(code, "NFA_VCOL "); break;
case NFA_VCOL_GT:
STRCPY(code, "NFA_VCOL_GT "); break;
case NFA_VCOL_LT:
STRCPY(code, "NFA_VCOL_LT "); break;
case NFA_MARK:
STRCPY(code, "NFA_MARK "); break;
case NFA_MARK_GT:
STRCPY(code, "NFA_MARK_GT "); break;
case NFA_MARK_LT:
STRCPY(code, "NFA_MARK_LT "); break;
case NFA_CURSOR:
STRCPY(code, "NFA_CURSOR "); break;
case NFA_VISUAL:
STRCPY(code, "NFA_VISUAL "); break;
case NFA_ANY_COMPOSING:
STRCPY(code, "NFA_ANY_COMPOSING "); break;
case NFA_STAR:
STRCPY(code, "NFA_STAR "); break;
case NFA_STAR_NONGREEDY:
STRCPY(code, "NFA_STAR_NONGREEDY "); break;
case NFA_QUEST:
STRCPY(code, "NFA_QUEST"); break;
case NFA_QUEST_NONGREEDY:
STRCPY(code, "NFA_QUEST_NON_GREEDY"); break;
case NFA_EMPTY:
STRCPY(code, "NFA_EMPTY"); break;
case NFA_OR:
STRCPY(code, "NFA_OR"); break;
case NFA_START_COLL:
STRCPY(code, "NFA_START_COLL"); break;
case NFA_END_COLL:
STRCPY(code, "NFA_END_COLL"); break;
case NFA_START_NEG_COLL:
STRCPY(code, "NFA_START_NEG_COLL"); break;
case NFA_END_NEG_COLL:
STRCPY(code, "NFA_END_NEG_COLL"); break;
case NFA_RANGE:
STRCPY(code, "NFA_RANGE"); break;
case NFA_RANGE_MIN:
STRCPY(code, "NFA_RANGE_MIN"); break;
case NFA_RANGE_MAX:
STRCPY(code, "NFA_RANGE_MAX"); break;
case NFA_CLASS_ALNUM:
STRCPY(code, "NFA_CLASS_ALNUM"); break;
case NFA_CLASS_ALPHA:
STRCPY(code, "NFA_CLASS_ALPHA"); break;
case NFA_CLASS_BLANK:
STRCPY(code, "NFA_CLASS_BLANK"); break;
case NFA_CLASS_CNTRL:
STRCPY(code, "NFA_CLASS_CNTRL"); break;
case NFA_CLASS_DIGIT:
STRCPY(code, "NFA_CLASS_DIGIT"); break;
case NFA_CLASS_GRAPH:
STRCPY(code, "NFA_CLASS_GRAPH"); break;
case NFA_CLASS_LOWER:
STRCPY(code, "NFA_CLASS_LOWER"); break;
case NFA_CLASS_PRINT:
STRCPY(code, "NFA_CLASS_PRINT"); break;
case NFA_CLASS_PUNCT:
STRCPY(code, "NFA_CLASS_PUNCT"); break;
case NFA_CLASS_SPACE:
STRCPY(code, "NFA_CLASS_SPACE"); break;
case NFA_CLASS_UPPER:
STRCPY(code, "NFA_CLASS_UPPER"); break;
case NFA_CLASS_XDIGIT:
STRCPY(code, "NFA_CLASS_XDIGIT"); break;
case NFA_CLASS_TAB:
STRCPY(code, "NFA_CLASS_TAB"); break;
case NFA_CLASS_RETURN:
STRCPY(code, "NFA_CLASS_RETURN"); break;
case NFA_CLASS_BACKSPACE:
STRCPY(code, "NFA_CLASS_BACKSPACE"); break;
case NFA_CLASS_ESCAPE:
STRCPY(code, "NFA_CLASS_ESCAPE"); break;
case NFA_CLASS_IDENT:
STRCPY(code, "NFA_CLASS_IDENT"); break;
case NFA_CLASS_KEYWORD:
STRCPY(code, "NFA_CLASS_KEYWORD"); break;
case NFA_CLASS_FNAME:
STRCPY(code, "NFA_CLASS_FNAME"); break;
case NFA_ANY:
STRCPY(code, "NFA_ANY"); break;
case NFA_IDENT:
STRCPY(code, "NFA_IDENT"); break;
case NFA_SIDENT:
STRCPY(code, "NFA_SIDENT"); break;
case NFA_KWORD:
STRCPY(code, "NFA_KWORD"); break;
case NFA_SKWORD:
STRCPY(code, "NFA_SKWORD"); break;
case NFA_FNAME:
STRCPY(code, "NFA_FNAME"); break;
case NFA_SFNAME:
STRCPY(code, "NFA_SFNAME"); break;
case NFA_PRINT:
STRCPY(code, "NFA_PRINT"); break;
case NFA_SPRINT:
STRCPY(code, "NFA_SPRINT"); break;
case NFA_WHITE:
STRCPY(code, "NFA_WHITE"); break;
case NFA_NWHITE:
STRCPY(code, "NFA_NWHITE"); break;
case NFA_DIGIT:
STRCPY(code, "NFA_DIGIT"); break;
case NFA_NDIGIT:
STRCPY(code, "NFA_NDIGIT"); break;
case NFA_HEX:
STRCPY(code, "NFA_HEX"); break;
case NFA_NHEX:
STRCPY(code, "NFA_NHEX"); break;
case NFA_OCTAL:
STRCPY(code, "NFA_OCTAL"); break;
case NFA_NOCTAL:
STRCPY(code, "NFA_NOCTAL"); break;
case NFA_WORD:
STRCPY(code, "NFA_WORD"); break;
case NFA_NWORD:
STRCPY(code, "NFA_NWORD"); break;
case NFA_HEAD:
STRCPY(code, "NFA_HEAD"); break;
case NFA_NHEAD:
STRCPY(code, "NFA_NHEAD"); break;
case NFA_ALPHA:
STRCPY(code, "NFA_ALPHA"); break;
case NFA_NALPHA:
STRCPY(code, "NFA_NALPHA"); break;
case NFA_LOWER:
STRCPY(code, "NFA_LOWER"); break;
case NFA_NLOWER:
STRCPY(code, "NFA_NLOWER"); break;
case NFA_UPPER:
STRCPY(code, "NFA_UPPER"); break;
case NFA_NUPPER:
STRCPY(code, "NFA_NUPPER"); break;
case NFA_LOWER_IC:
STRCPY(code, "NFA_LOWER_IC"); break;
case NFA_NLOWER_IC:
STRCPY(code, "NFA_NLOWER_IC"); break;
case NFA_UPPER_IC:
STRCPY(code, "NFA_UPPER_IC"); break;
case NFA_NUPPER_IC:
STRCPY(code, "NFA_NUPPER_IC"); break;
default:
STRCPY(code, "CHAR(x)");
code[5] = c;
}
if (addnl == true) {
STRCAT(code, " + NEWLINE ");
}
}
static FILE *log_fd;
static const uint8_t e_log_open_failed[] =
N_("Could not open temporary log file for writing, displaying on stderr... ");
// Print the postfix notation of the current regexp.
static void nfa_postfix_dump(uint8_t *expr, int retval)
{
int *p;
FILE *f;
f = fopen(NFA_REGEXP_DUMP_LOG, "a");
if (f == NULL) {
return;
}
fprintf(f, "\n-------------------------\n");
if (retval == FAIL) {
fprintf(f, ">>> NFA engine failed... \n");
} else if (retval == OK) {
fprintf(f, ">>> NFA engine succeeded !\n");
}
fprintf(f, "Regexp: \"%s\"\nPostfix notation (char): \"", expr);
for (p = post_start; *p && p < post_ptr; p++) {
nfa_set_code(*p);
fprintf(f, "%s, ", code);
}
fprintf(f, "\"\nPostfix notation (int): ");
for (p = post_start; *p && p < post_ptr; p++) {
fprintf(f, "%d ", *p);
}
fprintf(f, "\n\n");
fclose(f);
}
// Print the NFA starting with a root node "state".
static void nfa_print_state(FILE *debugf, nfa_state_T *state)
{
garray_T indent;
ga_init(&indent, 1, 64);
ga_append(&indent, '\0');
nfa_print_state2(debugf, state, &indent);
ga_clear(&indent);
}
static void nfa_print_state2(FILE *debugf, nfa_state_T *state, garray_T *indent)
{
uint8_t *p;
if (state == NULL) {
return;
}
fprintf(debugf, "(%2d)", abs(state->id));
// Output indent
p = (uint8_t *)indent->ga_data;
if (indent->ga_len >= 3) {
int last = indent->ga_len - 3;
uint8_t save[2];
strncpy(save, &p[last], 2); // NOLINT(runtime/printf)
memcpy(&p[last], "+-", 2);
fprintf(debugf, " %s", p);
strncpy(&p[last], save, 2); // NOLINT(runtime/printf)
} else {
fprintf(debugf, " %s", p);
}
nfa_set_code(state->c);
fprintf(debugf, "%s (%d) (id=%d) val=%d\n",
code,
state->c,
abs(state->id),
state->val);
if (state->id < 0) {
return;
}
state->id = abs(state->id) * -1;
// grow indent for state->out
indent->ga_len -= 1;
if (state->out1) {
ga_concat(indent, (uint8_t *)"| ");
} else {
ga_concat(indent, (uint8_t *)" ");
}
ga_append(indent, NUL);
nfa_print_state2(debugf, state->out, indent);
// replace last part of indent for state->out1
indent->ga_len -= 3;
ga_concat(indent, (uint8_t *)" ");
ga_append(indent, NUL);
nfa_print_state2(debugf, state->out1, indent);
// shrink indent
indent->ga_len -= 3;
ga_append(indent, NUL);
}
// Print the NFA state machine.
static void nfa_dump(nfa_regprog_T *prog)
{
FILE *debugf = fopen(NFA_REGEXP_DUMP_LOG, "a");
if (debugf == NULL) {
return;
}
nfa_print_state(debugf, prog->start);
if (prog->reganch) {
fprintf(debugf, "reganch: %d\n", prog->reganch);
}
if (prog->regstart != NUL) {
fprintf(debugf, "regstart: %c (decimal: %d)\n",
prog->regstart, prog->regstart);
}
if (prog->match_text != NULL) {
fprintf(debugf, "match_text: \"%s\"\n", prog->match_text);
}
fclose(debugf);
}
#endif // REGEXP_DEBUG
// Parse r.e. @expr and convert it into postfix form.
// Return the postfix string on success, NULL otherwise.
static int *re2post(void)
{
if (nfa_reg(REG_NOPAREN) == FAIL) {
return NULL;
}
EMIT(NFA_MOPEN);
return post_start;
}
// NB. Some of the code below is inspired by Russ's.
// Represents an NFA state plus zero or one or two arrows exiting.
// if c == MATCH, no arrows out; matching state.
// If c == SPLIT, unlabeled arrows to out and out1 (if != NULL).
// If c < 256, labeled arrow with character c to out.
static nfa_state_T *state_ptr; // points to nfa_prog->state
// Allocate and initialize nfa_state_T.
static nfa_state_T *alloc_state(int c, nfa_state_T *out, nfa_state_T *out1)
{
nfa_state_T *s;
if (istate >= nstate) {
return NULL;
}
s = &state_ptr[istate++];
s->c = c;
s->out = out;
s->out1 = out1;
s->val = 0;
s->id = istate;
s->lastlist[0] = 0;
s->lastlist[1] = 0;
return s;
}
// A partially built NFA without the matching state filled in.
// Frag_T.start points at the start state.
// Frag_T.out is a list of places that need to be set to the
// next state for this fragment.
// Initialize a Frag_T struct and return it.
static Frag_T frag(nfa_state_T *start, Ptrlist *out)
{
Frag_T n;
n.start = start;
n.out = out;
return n;
}
// Create singleton list containing just outp.
static Ptrlist *list1(nfa_state_T **outp)
{
Ptrlist *l;
l = (Ptrlist *)outp;
l->next = NULL;
return l;
}
// Patch the list of states at out to point to start.
static void patch(Ptrlist *l, nfa_state_T *s)
{
Ptrlist *next;
for (; l; l = next) {
next = l->next;
l->s = s;
}
}
// Join the two lists l1 and l2, returning the combination.
static Ptrlist *append(Ptrlist *l1, Ptrlist *l2)
{
Ptrlist *oldl1;
oldl1 = l1;
while (l1->next) {
l1 = l1->next;
}
l1->next = l2;
return oldl1;
}
// Stack used for transforming postfix form into NFA.
static Frag_T empty;
static void st_error(int *postfix, int *end, int *p)
{
#ifdef NFA_REGEXP_ERROR_LOG
FILE *df;
int *p2;
df = fopen(NFA_REGEXP_ERROR_LOG, "a");
if (df) {
fprintf(df, "Error popping the stack!\n");
# ifdef REGEXP_DEBUG
fprintf(df, "Current regexp is \"%s\"\n", nfa_regengine.expr);
# endif
fprintf(df, "Postfix form is: ");
# ifdef REGEXP_DEBUG
for (p2 = postfix; p2 < end; p2++) {
nfa_set_code(*p2);
fprintf(df, "%s, ", code);
}
nfa_set_code(*p);
fprintf(df, "\nCurrent position is: ");
for (p2 = postfix; p2 <= p; p2++) {
nfa_set_code(*p2);
fprintf(df, "%s, ", code);
}
# else
for (p2 = postfix; p2 < end; p2++) {
fprintf(df, "%d, ", *p2);
}
fprintf(df, "\nCurrent position is: ");
for (p2 = postfix; p2 <= p; p2++) {
fprintf(df, "%d, ", *p2);
}
# endif
fprintf(df, "\n--------------------------\n");
fclose(df);
}
#endif
emsg(_("E874: (NFA) Could not pop the stack!"));
}
// Push an item onto the stack.
static void st_push(Frag_T s, Frag_T **p, Frag_T *stack_end)
{
Frag_T *stackp = *p;
if (stackp >= stack_end) {
return;
}
*stackp = s;
*p = *p + 1;
}
// Pop an item from the stack.
static Frag_T st_pop(Frag_T **p, Frag_T *stack)
{
Frag_T *stackp;
*p = *p - 1;
stackp = *p;
if (stackp < stack) {
return empty;
}
return **p;
}
// Estimate the maximum byte length of anything matching "state".
// When unknown or unlimited return -1.
static int nfa_max_width(nfa_state_T *startstate, int depth)
{
int l, r;
nfa_state_T *state = startstate;
int len = 0;
// detect looping in a NFA_SPLIT
if (depth > 4) {
return -1;
}
while (state != NULL) {
switch (state->c) {
case NFA_END_INVISIBLE:
case NFA_END_INVISIBLE_NEG:
// the end, return what we have
return len;
case NFA_SPLIT:
// two alternatives, use the maximum
l = nfa_max_width(state->out, depth + 1);
r = nfa_max_width(state->out1, depth + 1);
if (l < 0 || r < 0) {
return -1;
}
return len + (l > r ? l : r);
case NFA_ANY:
case NFA_START_COLL:
case NFA_START_NEG_COLL:
// Matches some character, including composing chars.
len += MB_MAXBYTES;
if (state->c != NFA_ANY) {
// Skip over the characters.
state = state->out1->out;
continue;
}
break;
case NFA_DIGIT:
case NFA_WHITE:
case NFA_HEX:
case NFA_OCTAL:
// ascii
len++;
break;
case NFA_IDENT:
case NFA_SIDENT:
case NFA_KWORD:
case NFA_SKWORD:
case NFA_FNAME:
case NFA_SFNAME:
case NFA_PRINT:
case NFA_SPRINT:
case NFA_NWHITE:
case NFA_NDIGIT:
case NFA_NHEX:
case NFA_NOCTAL:
case NFA_WORD:
case NFA_NWORD:
case NFA_HEAD:
case NFA_NHEAD:
case NFA_ALPHA:
case NFA_NALPHA:
case NFA_LOWER:
case NFA_NLOWER:
case NFA_UPPER:
case NFA_NUPPER:
case NFA_LOWER_IC:
case NFA_NLOWER_IC:
case NFA_UPPER_IC:
case NFA_NUPPER_IC:
case NFA_ANY_COMPOSING:
// possibly non-ascii
len += 3;
break;
case NFA_START_INVISIBLE:
case NFA_START_INVISIBLE_NEG:
case NFA_START_INVISIBLE_BEFORE:
case NFA_START_INVISIBLE_BEFORE_NEG:
// zero-width, out1 points to the END state
state = state->out1->out;
continue;
case NFA_BACKREF1:
case NFA_BACKREF2:
case NFA_BACKREF3:
case NFA_BACKREF4:
case NFA_BACKREF5:
case NFA_BACKREF6:
case NFA_BACKREF7:
case NFA_BACKREF8:
case NFA_BACKREF9:
case NFA_ZREF1:
case NFA_ZREF2:
case NFA_ZREF3:
case NFA_ZREF4:
case NFA_ZREF5:
case NFA_ZREF6:
case NFA_ZREF7:
case NFA_ZREF8:
case NFA_ZREF9:
case NFA_NEWL:
case NFA_SKIP:
// unknown width
return -1;
case NFA_BOL:
case NFA_EOL:
case NFA_BOF:
case NFA_EOF:
case NFA_BOW:
case NFA_EOW:
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_ZCLOSE:
case NFA_ZCLOSE1:
case NFA_ZCLOSE2:
case NFA_ZCLOSE3:
case NFA_ZCLOSE4:
case NFA_ZCLOSE5:
case NFA_ZCLOSE6:
case NFA_ZCLOSE7:
case NFA_ZCLOSE8:
case NFA_ZCLOSE9:
case NFA_MCLOSE:
case NFA_MCLOSE1:
case NFA_MCLOSE2:
case NFA_MCLOSE3:
case NFA_MCLOSE4:
case NFA_MCLOSE5:
case NFA_MCLOSE6:
case NFA_MCLOSE7:
case NFA_MCLOSE8:
case NFA_MCLOSE9:
case NFA_NOPEN:
case NFA_NCLOSE:
case NFA_LNUM_GT:
case NFA_LNUM_LT:
case NFA_COL_GT:
case NFA_COL_LT:
case NFA_VCOL_GT:
case NFA_VCOL_LT:
case NFA_MARK_GT:
case NFA_MARK_LT:
case NFA_VISUAL:
case NFA_LNUM:
case NFA_CURSOR:
case NFA_COL:
case NFA_VCOL:
case NFA_MARK:
case NFA_ZSTART:
case NFA_ZEND:
case NFA_OPT_CHARS:
case NFA_EMPTY:
case NFA_START_PATTERN:
case NFA_END_PATTERN:
case NFA_COMPOSING:
case NFA_END_COMPOSING:
// zero-width
break;
default:
if (state->c < 0) {
// don't know what this is
return -1;
}
// normal character
len += utf_char2len(state->c);
break;
}
// normal way to continue
state = state->out;
}
// unrecognized, "cannot happen"
return -1;
}
// Convert a postfix form into its equivalent NFA.
// Return the NFA start state on success, NULL otherwise.
static nfa_state_T *post2nfa(int *postfix, int *end, int nfa_calc_size)
{
int *p;
int mopen;
int mclose;
Frag_T *stack = NULL;
Frag_T *stackp = NULL;
Frag_T *stack_end = NULL;
Frag_T e1;
Frag_T e2;
Frag_T e;
nfa_state_T *s;
nfa_state_T *s1;
nfa_state_T *matchstate;
nfa_state_T *ret = NULL;
if (postfix == NULL) {
return NULL;
}
#define PUSH(s) st_push((s), &stackp, stack_end)
#define POP() st_pop(&stackp, stack); \
if (stackp < stack) { \
st_error(postfix, end, p); \
xfree(stack); \
return NULL; \
}
if (nfa_calc_size == false) {
// Allocate space for the stack. Max states on the stack: "nstate".
stack = xmalloc((size_t)(nstate + 1) * sizeof(Frag_T));
stackp = stack;
stack_end = stack + (nstate + 1);
}
for (p = postfix; p < end; p++) {
switch (*p) {
case NFA_CONCAT:
// Concatenation.
// Pay attention: this operator does not exist in the r.e. itself
// (it is implicit, really). It is added when r.e. is translated
// to postfix form in re2post().
if (nfa_calc_size == true) {
// nstate += 0;
break;
}
e2 = POP();
e1 = POP();
patch(e1.out, e2.start);
PUSH(frag(e1.start, e2.out));
break;
case NFA_OR:
// Alternation
if (nfa_calc_size == true) {
nstate++;
break;
}
e2 = POP();
e1 = POP();
s = alloc_state(NFA_SPLIT, e1.start, e2.start);
if (s == NULL) {
goto theend;
}
PUSH(frag(s, append(e1.out, e2.out)));
break;
case NFA_STAR:
// Zero or more, prefer more
if (nfa_calc_size == true) {
nstate++;
break;
}
e = POP();
s = alloc_state(NFA_SPLIT, e.start, NULL);
if (s == NULL) {
goto theend;
}
patch(e.out, s);
PUSH(frag(s, list1(&s->out1)));
break;
case NFA_STAR_NONGREEDY:
// Zero or more, prefer zero
if (nfa_calc_size == true) {
nstate++;
break;
}
e = POP();
s = alloc_state(NFA_SPLIT, NULL, e.start);
if (s == NULL) {
goto theend;
}
patch(e.out, s);
PUSH(frag(s, list1(&s->out)));
break;
case NFA_QUEST:
// one or zero atoms=> greedy match
if (nfa_calc_size == true) {
nstate++;
break;
}
e = POP();
s = alloc_state(NFA_SPLIT, e.start, NULL);
if (s == NULL) {
goto theend;
}
PUSH(frag(s, append(e.out, list1(&s->out1))));
break;
case NFA_QUEST_NONGREEDY:
// zero or one atoms => non-greedy match
if (nfa_calc_size == true) {
nstate++;
break;
}
e = POP();
s = alloc_state(NFA_SPLIT, NULL, e.start);
if (s == NULL) {
goto theend;
}
PUSH(frag(s, append(e.out, list1(&s->out))));
break;
case NFA_END_COLL:
case NFA_END_NEG_COLL:
// On the stack is the sequence starting with NFA_START_COLL or
// NFA_START_NEG_COLL and all possible characters. Patch it to
// add the output to the start.
if (nfa_calc_size == true) {
nstate++;
break;
}
e = POP();
s = alloc_state(NFA_END_COLL, NULL, NULL);
if (s == NULL) {
goto theend;
}
patch(e.out, s);
e.start->out1 = s;
PUSH(frag(e.start, list1(&s->out)));
break;
case NFA_RANGE:
// Before this are two characters, the low and high end of a
// range. Turn them into two states with MIN and MAX.
if (nfa_calc_size == true) {
// nstate += 0;
break;
}
e2 = POP();
e1 = POP();
e2.start->val = e2.start->c;
e2.start->c = NFA_RANGE_MAX;
e1.start->val = e1.start->c;
e1.start->c = NFA_RANGE_MIN;
patch(e1.out, e2.start);
PUSH(frag(e1.start, e2.out));
break;
case NFA_EMPTY:
// 0-length, used in a repetition with max/min count of 0
if (nfa_calc_size == true) {
nstate++;
break;
}
s = alloc_state(NFA_EMPTY, NULL, NULL);
if (s == NULL) {
goto theend;
}
PUSH(frag(s, list1(&s->out)));
break;
case NFA_OPT_CHARS: {
int n;
// \%[abc] implemented as:
// NFA_SPLIT
// +-CHAR(a)
// | +-NFA_SPLIT
// | +-CHAR(b)
// | | +-NFA_SPLIT
// | | +-CHAR(c)
// | | | +-next
// | | +- next
// | +- next
// +- next
n = *++p; // get number of characters
if (nfa_calc_size == true) {
nstate += n;
break;
}
s = NULL; // avoid compiler warning
e1.out = NULL; // stores list with out1's
s1 = NULL; // previous NFA_SPLIT to connect to
while (n-- > 0) {
e = POP(); // get character
s = alloc_state(NFA_SPLIT, e.start, NULL);
if (s == NULL) {
goto theend;
}
if (e1.out == NULL) {
e1 = e;
}
patch(e.out, s1);
append(e1.out, list1(&s->out1));
s1 = s;
}
PUSH(frag(s, e1.out));
break;
}
case NFA_PREV_ATOM_NO_WIDTH:
case NFA_PREV_ATOM_NO_WIDTH_NEG:
case NFA_PREV_ATOM_JUST_BEFORE:
case NFA_PREV_ATOM_JUST_BEFORE_NEG:
case NFA_PREV_ATOM_LIKE_PATTERN: {
int before = (*p == NFA_PREV_ATOM_JUST_BEFORE
|| *p == NFA_PREV_ATOM_JUST_BEFORE_NEG);
int pattern = (*p == NFA_PREV_ATOM_LIKE_PATTERN);
int start_state;
int end_state;
int n = 0;
nfa_state_T *zend;
nfa_state_T *skip;
switch (*p) {
case NFA_PREV_ATOM_NO_WIDTH:
start_state = NFA_START_INVISIBLE;
end_state = NFA_END_INVISIBLE;
break;
case NFA_PREV_ATOM_NO_WIDTH_NEG:
start_state = NFA_START_INVISIBLE_NEG;
end_state = NFA_END_INVISIBLE_NEG;
break;
case NFA_PREV_ATOM_JUST_BEFORE:
start_state = NFA_START_INVISIBLE_BEFORE;
end_state = NFA_END_INVISIBLE;
break;
case NFA_PREV_ATOM_JUST_BEFORE_NEG:
start_state = NFA_START_INVISIBLE_BEFORE_NEG;
end_state = NFA_END_INVISIBLE_NEG;
break;
default: // NFA_PREV_ATOM_LIKE_PATTERN:
start_state = NFA_START_PATTERN;
end_state = NFA_END_PATTERN;
break;
}
if (before) {
n = *++p; // get the count
}
// The \@= operator: match the preceding atom with zero width.
// The \@! operator: no match for the preceding atom.
// The \@<= operator: match for the preceding atom.
// The \@<! operator: no match for the preceding atom.
// Surrounds the preceding atom with START_INVISIBLE and
// END_INVISIBLE, similarly to MOPEN.
if (nfa_calc_size == true) {
nstate += pattern ? 4 : 2;
break;
}
e = POP();
s1 = alloc_state(end_state, NULL, NULL);
if (s1 == NULL) {
goto theend;
}
s = alloc_state(start_state, e.start, s1);
if (s == NULL) {
goto theend;
}
if (pattern) {
// NFA_ZEND -> NFA_END_PATTERN -> NFA_SKIP -> what follows.
skip = alloc_state(NFA_SKIP, NULL, NULL);
if (skip == NULL) {
goto theend;
}
zend = alloc_state(NFA_ZEND, s1, NULL);
if (zend == NULL) {
goto theend;
}
s1->out = skip;
patch(e.out, zend);
PUSH(frag(s, list1(&skip->out)));
} else {
patch(e.out, s1);
PUSH(frag(s, list1(&s1->out)));
if (before) {
if (n <= 0) {
// See if we can guess the maximum width, it avoids a
// lot of pointless tries.
n = nfa_max_width(e.start, 0);
}
s->val = n; // store the count
}
}
break;
}
case NFA_COMPOSING: // char with composing char
FALLTHROUGH;
case NFA_MOPEN: // \( \) Submatch
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN: // \z( \) Submatch
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_NOPEN: // \%( \) "Invisible Submatch"
if (nfa_calc_size == true) {
nstate += 2;
break;
}
mopen = *p;
switch (*p) {
case NFA_NOPEN:
mclose = NFA_NCLOSE; break;
case NFA_ZOPEN:
mclose = NFA_ZCLOSE; break;
case NFA_ZOPEN1:
mclose = NFA_ZCLOSE1; break;
case NFA_ZOPEN2:
mclose = NFA_ZCLOSE2; break;
case NFA_ZOPEN3:
mclose = NFA_ZCLOSE3; break;
case NFA_ZOPEN4:
mclose = NFA_ZCLOSE4; break;
case NFA_ZOPEN5:
mclose = NFA_ZCLOSE5; break;
case NFA_ZOPEN6:
mclose = NFA_ZCLOSE6; break;
case NFA_ZOPEN7:
mclose = NFA_ZCLOSE7; break;
case NFA_ZOPEN8:
mclose = NFA_ZCLOSE8; break;
case NFA_ZOPEN9:
mclose = NFA_ZCLOSE9; break;
case NFA_COMPOSING:
mclose = NFA_END_COMPOSING; break;
default:
// NFA_MOPEN, NFA_MOPEN1 .. NFA_MOPEN9
mclose = *p + NSUBEXP;
break;
}
// Allow "NFA_MOPEN" as a valid postfix representation for
// the empty regexp "". In this case, the NFA will be
// NFA_MOPEN -> NFA_MCLOSE. Note that this also allows
// empty groups of parenthesis, and empty mbyte chars
if (stackp == stack) {
s = alloc_state(mopen, NULL, NULL);
if (s == NULL) {
goto theend;
}
s1 = alloc_state(mclose, NULL, NULL);
if (s1 == NULL) {
goto theend;
}
patch(list1(&s->out), s1);
PUSH(frag(s, list1(&s1->out)));
break;
}
// At least one node was emitted before NFA_MOPEN, so
// at least one node will be between NFA_MOPEN and NFA_MCLOSE
e = POP();
s = alloc_state(mopen, e.start, NULL); // `('
if (s == NULL) {
goto theend;
}
s1 = alloc_state(mclose, NULL, NULL); // `)'
if (s1 == NULL) {
goto theend;
}
patch(e.out, s1);
if (mopen == NFA_COMPOSING) {
// COMPOSING->out1 = END_COMPOSING
patch(list1(&s->out1), s1);
}
PUSH(frag(s, list1(&s1->out)));
break;
case NFA_BACKREF1:
case NFA_BACKREF2:
case NFA_BACKREF3:
case NFA_BACKREF4:
case NFA_BACKREF5:
case NFA_BACKREF6:
case NFA_BACKREF7:
case NFA_BACKREF8:
case NFA_BACKREF9:
case NFA_ZREF1:
case NFA_ZREF2:
case NFA_ZREF3:
case NFA_ZREF4:
case NFA_ZREF5:
case NFA_ZREF6:
case NFA_ZREF7:
case NFA_ZREF8:
case NFA_ZREF9:
if (nfa_calc_size == true) {
nstate += 2;
break;
}
s = alloc_state(*p, NULL, NULL);
if (s == NULL) {
goto theend;
}
s1 = alloc_state(NFA_SKIP, NULL, NULL);
if (s1 == NULL) {
goto theend;
}
patch(list1(&s->out), s1);
PUSH(frag(s, list1(&s1->out)));
break;
case NFA_LNUM:
case NFA_LNUM_GT:
case NFA_LNUM_LT:
case NFA_VCOL:
case NFA_VCOL_GT:
case NFA_VCOL_LT:
case NFA_COL:
case NFA_COL_GT:
case NFA_COL_LT:
case NFA_MARK:
case NFA_MARK_GT:
case NFA_MARK_LT: {
int n = *++p; // lnum, col or mark name
if (nfa_calc_size == true) {
nstate += 1;
break;
}
s = alloc_state(p[-1], NULL, NULL);
if (s == NULL) {
goto theend;
}
s->val = n;
PUSH(frag(s, list1(&s->out)));
break;
}
case NFA_ZSTART:
case NFA_ZEND:
default:
// Operands
if (nfa_calc_size == true) {
nstate++;
break;
}
s = alloc_state(*p, NULL, NULL);
if (s == NULL) {
goto theend;
}
PUSH(frag(s, list1(&s->out)));
break;
} // switch(*p)
} // for(p = postfix; *p; ++p)
if (nfa_calc_size == true) {
nstate++;
goto theend; // Return value when counting size is ignored anyway
}
e = POP();
if (stackp != stack) {
xfree(stack);
EMSG_RET_NULL(_("E875: (NFA regexp) (While converting from postfix to NFA),"
"too many states left on stack"));
}
if (istate >= nstate) {
xfree(stack);
EMSG_RET_NULL(_("E876: (NFA regexp) "
"Not enough space to store the whole NFA "));
}
matchstate = &state_ptr[istate++]; // the match state
matchstate->c = NFA_MATCH;
matchstate->out = matchstate->out1 = NULL;
matchstate->id = 0;
patch(e.out, matchstate);
ret = e.start;
theend:
xfree(stack);
return ret;
#undef POP1
#undef PUSH1
#undef POP2
#undef PUSH2
#undef POP
#undef PUSH
}
// After building the NFA program, inspect it to add optimization hints.
static void nfa_postprocess(nfa_regprog_T *prog)
{
int i;
int c;
for (i = 0; i < prog->nstate; i++) {
c = prog->state[i].c;
if (c == NFA_START_INVISIBLE
|| c == NFA_START_INVISIBLE_NEG
|| c == NFA_START_INVISIBLE_BEFORE
|| c == NFA_START_INVISIBLE_BEFORE_NEG) {
int directly;
// Do it directly when what follows is possibly the end of the
// match.
if (match_follows(prog->state[i].out1->out, 0)) {
directly = true;
} else {
int ch_invisible = failure_chance(prog->state[i].out, 0);
int ch_follows = failure_chance(prog->state[i].out1->out, 0);
// Postpone when the invisible match is expensive or has a
// lower chance of failing.
if (c == NFA_START_INVISIBLE_BEFORE
|| c == NFA_START_INVISIBLE_BEFORE_NEG) {
// "before" matches are very expensive when
// unbounded, always prefer what follows then,
// unless what follows will always match.
// Otherwise strongly prefer what follows.
if (prog->state[i].val <= 0 && ch_follows > 0) {
directly = false;
} else {
directly = ch_follows * 10 < ch_invisible;
}
} else {
// normal invisible, first do the one with the
// highest failure chance
directly = ch_follows < ch_invisible;
}
}
if (directly) {
// switch to the _FIRST state
prog->state[i].c++;
}
}
}
}
/////////////////////////////////////////////////////////////////
// NFA execution code.
/////////////////////////////////////////////////////////////////
// Values for done in nfa_pim_T.
#define NFA_PIM_UNUSED 0 // pim not used
#define NFA_PIM_TODO 1 // pim not done yet
#define NFA_PIM_MATCH 2 // pim executed, matches
#define NFA_PIM_NOMATCH 3 // pim executed, no match
#ifdef REGEXP_DEBUG
static void log_subsexpr(regsubs_T *subs)
{
log_subexpr(&subs->norm);
if (rex.nfa_has_zsubexpr) {
log_subexpr(&subs->synt);
}
}
static void log_subexpr(regsub_T *sub)
{
int j;
for (j = 0; j < sub->in_use; j++) {
if (REG_MULTI) {
fprintf(log_fd, "*** group %d, start: c=%d, l=%d, end: c=%d, l=%d\n",
j,
sub->list.multi[j].start_col,
(int)sub->list.multi[j].start_lnum,
sub->list.multi[j].end_col,
(int)sub->list.multi[j].end_lnum);
} else {
char *s = (char *)sub->list.line[j].start;
char *e = (char *)sub->list.line[j].end;
fprintf(log_fd, "*** group %d, start: \"%s\", end: \"%s\"\n",
j,
s == NULL ? "NULL" : s,
e == NULL ? "NULL" : e);
}
}
}
static char *pim_info(const nfa_pim_T *pim)
{
static char buf[30];
if (pim == NULL || pim->result == NFA_PIM_UNUSED) {
buf[0] = NUL;
} else {
snprintf(buf, sizeof(buf), " PIM col %d",
REG_MULTI
? (int)pim->end.pos.col
: (int)(pim->end.ptr - rex.input));
}
return buf;
}
#endif
// Used during execution: whether a match has been found.
static int nfa_match;
static proftime_T *nfa_time_limit;
static int *nfa_timed_out;
static int nfa_time_count;
// Copy postponed invisible match info from "from" to "to".
static void copy_pim(nfa_pim_T *to, nfa_pim_T *from)
{
to->result = from->result;
to->state = from->state;
copy_sub(&to->subs.norm, &from->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub(&to->subs.synt, &from->subs.synt);
}
to->end = from->end;
}
static void clear_sub(regsub_T *sub)
{
if (REG_MULTI) {
// Use 0xff to set lnum to -1
memset(sub->list.multi, 0xff, sizeof(struct multipos) * (size_t)rex.nfa_nsubexpr);
} else {
memset(sub->list.line, 0, sizeof(struct linepos) * (size_t)rex.nfa_nsubexpr);
}
sub->in_use = 0;
}
// Copy the submatches from "from" to "to".
static void copy_sub(regsub_T *to, regsub_T *from)
{
to->in_use = from->in_use;
if (from->in_use <= 0) {
return;
}
// Copy the match start and end positions.
if (REG_MULTI) {
memmove(&to->list.multi[0], &from->list.multi[0],
sizeof(struct multipos) * (size_t)from->in_use);
to->orig_start_col = from->orig_start_col;
} else {
memmove(&to->list.line[0], &from->list.line[0],
sizeof(struct linepos) * (size_t)from->in_use);
}
}
// Like copy_sub() but exclude the main match.
static void copy_sub_off(regsub_T *to, regsub_T *from)
{
if (to->in_use < from->in_use) {
to->in_use = from->in_use;
}
if (from->in_use <= 1) {
return;
}
// Copy the match start and end positions.
if (REG_MULTI) {
memmove(&to->list.multi[1], &from->list.multi[1],
sizeof(struct multipos) * (size_t)(from->in_use - 1));
} else {
memmove(&to->list.line[1], &from->list.line[1],
sizeof(struct linepos) * (size_t)(from->in_use - 1));
}
}
// Like copy_sub() but only do the end of the main match if \ze is present.
static void copy_ze_off(regsub_T *to, regsub_T *from)
{
if (!rex.nfa_has_zend) {
return;
}
if (REG_MULTI) {
if (from->list.multi[0].end_lnum >= 0) {
to->list.multi[0].end_lnum = from->list.multi[0].end_lnum;
to->list.multi[0].end_col = from->list.multi[0].end_col;
}
} else {
if (from->list.line[0].end != NULL) {
to->list.line[0].end = from->list.line[0].end;
}
}
}
// Return true if "sub1" and "sub2" have the same start positions.
// When using back-references also check the end position.
static bool sub_equal(regsub_T *sub1, regsub_T *sub2)
{
int i;
int todo;
linenr_T s1;
linenr_T s2;
uint8_t *sp1;
uint8_t *sp2;
todo = sub1->in_use > sub2->in_use ? sub1->in_use : sub2->in_use;
if (REG_MULTI) {
for (i = 0; i < todo; i++) {
if (i < sub1->in_use) {
s1 = sub1->list.multi[i].start_lnum;
} else {
s1 = -1;
}
if (i < sub2->in_use) {
s2 = sub2->list.multi[i].start_lnum;
} else {
s2 = -1;
}
if (s1 != s2) {
return false;
}
if (s1 != -1 && sub1->list.multi[i].start_col
!= sub2->list.multi[i].start_col) {
return false;
}
if (rex.nfa_has_backref) {
if (i < sub1->in_use) {
s1 = sub1->list.multi[i].end_lnum;
} else {
s1 = -1;
}
if (i < sub2->in_use) {
s2 = sub2->list.multi[i].end_lnum;
} else {
s2 = -1;
}
if (s1 != s2) {
return false;
}
if (s1 != -1
&& sub1->list.multi[i].end_col != sub2->list.multi[i].end_col) {
return false;
}
}
}
} else {
for (i = 0; i < todo; i++) {
if (i < sub1->in_use) {
sp1 = sub1->list.line[i].start;
} else {
sp1 = NULL;
}
if (i < sub2->in_use) {
sp2 = sub2->list.line[i].start;
} else {
sp2 = NULL;
}
if (sp1 != sp2) {
return false;
}
if (rex.nfa_has_backref) {
if (i < sub1->in_use) {
sp1 = sub1->list.line[i].end;
} else {
sp1 = NULL;
}
if (i < sub2->in_use) {
sp2 = sub2->list.line[i].end;
} else {
sp2 = NULL;
}
if (sp1 != sp2) {
return false;
}
}
}
}
return true;
}
#ifdef REGEXP_DEBUG
static void open_debug_log(TriState result)
{
log_fd = fopen(NFA_REGEXP_RUN_LOG, "a");
if (log_fd == NULL) {
emsg(_(e_log_open_failed));
log_fd = stderr;
}
fprintf(log_fd, "****************************\n");
fprintf(log_fd, "FINISHED RUNNING nfa_regmatch() recursively\n");
fprintf(log_fd, "MATCH = %s\n", result == kTrue ? "OK" : result == kNone ? "MAYBE" : "FALSE");
fprintf(log_fd, "****************************\n");
}
static void report_state(char *action, regsub_T *sub, nfa_state_T *state, int lid, nfa_pim_T *pim)
{
int col;
if (sub->in_use <= 0) {
col = -1;
} else if (REG_MULTI) {
col = sub->list.multi[0].start_col;
} else {
col = (int)(sub->list.line[0].start - rex.line);
}
nfa_set_code(state->c);
if (log_fd == NULL) {
open_debug_log(kNone);
}
fprintf(log_fd, "> %s state %d to list %d. char %d: %s (start col %d)%s\n",
action, abs(state->id), lid, state->c, code, col,
pim_info(pim));
}
#endif
/// @param l runtime state list
/// @param state state to update
/// @param subs pointers to subexpressions
/// @param pim postponed match or NULL
///
/// @return true if the same state is already in list "l" with the same
/// positions as "subs".
static bool has_state_with_pos(nfa_list_T *l, nfa_state_T *state, regsubs_T *subs, nfa_pim_T *pim)
FUNC_ATTR_NONNULL_ARG(1, 2, 3)
{
for (int i = 0; i < l->n; i++) {
nfa_thread_T *thread = &l->t[i];
if (thread->state->id == state->id
&& sub_equal(&thread->subs.norm, &subs->norm)
&& (!rex.nfa_has_zsubexpr
|| sub_equal(&thread->subs.synt, &subs->synt))
&& pim_equal(&thread->pim, pim)) {
return true;
}
}
return false;
}
// Return true if "one" and "two" are equal. That includes when both are not
// set.
static bool pim_equal(const nfa_pim_T *one, const nfa_pim_T *two)
{
const bool one_unused = (one == NULL || one->result == NFA_PIM_UNUSED);
const bool two_unused = (two == NULL || two->result == NFA_PIM_UNUSED);
if (one_unused) {
// one is unused: equal when two is also unused
return two_unused;
}
if (two_unused) {
// one is used and two is not: not equal
return false;
}
// compare the state id
if (one->state->id != two->state->id) {
return false;
}
// compare the position
if (REG_MULTI) {
return one->end.pos.lnum == two->end.pos.lnum
&& one->end.pos.col == two->end.pos.col;
}
return one->end.ptr == two->end.ptr;
}
// Return true if "state" leads to a NFA_MATCH without advancing the input.
static bool match_follows(const nfa_state_T *startstate, int depth)
FUNC_ATTR_NONNULL_ALL
{
const nfa_state_T *state = startstate;
// avoid too much recursion
if (depth > 10) {
return false;
}
while (state != NULL) {
switch (state->c) {
case NFA_MATCH:
case NFA_MCLOSE:
case NFA_END_INVISIBLE:
case NFA_END_INVISIBLE_NEG:
case NFA_END_PATTERN:
return true;
case NFA_SPLIT:
return match_follows(state->out, depth + 1)
|| match_follows(state->out1, depth + 1);
case NFA_START_INVISIBLE:
case NFA_START_INVISIBLE_FIRST:
case NFA_START_INVISIBLE_BEFORE:
case NFA_START_INVISIBLE_BEFORE_FIRST:
case NFA_START_INVISIBLE_NEG:
case NFA_START_INVISIBLE_NEG_FIRST:
case NFA_START_INVISIBLE_BEFORE_NEG:
case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
case NFA_COMPOSING:
// skip ahead to next state
state = state->out1->out;
continue;
case NFA_ANY:
case NFA_ANY_COMPOSING:
case NFA_IDENT:
case NFA_SIDENT:
case NFA_KWORD:
case NFA_SKWORD:
case NFA_FNAME:
case NFA_SFNAME:
case NFA_PRINT:
case NFA_SPRINT:
case NFA_WHITE:
case NFA_NWHITE:
case NFA_DIGIT:
case NFA_NDIGIT:
case NFA_HEX:
case NFA_NHEX:
case NFA_OCTAL:
case NFA_NOCTAL:
case NFA_WORD:
case NFA_NWORD:
case NFA_HEAD:
case NFA_NHEAD:
case NFA_ALPHA:
case NFA_NALPHA:
case NFA_LOWER:
case NFA_NLOWER:
case NFA_UPPER:
case NFA_NUPPER:
case NFA_LOWER_IC:
case NFA_NLOWER_IC:
case NFA_UPPER_IC:
case NFA_NUPPER_IC:
case NFA_START_COLL:
case NFA_START_NEG_COLL:
case NFA_NEWL:
// state will advance input
return false;
default:
if (state->c > 0) {
// state will advance input
return false;
}
// Others: zero-width or possibly zero-width, might still find
// a match at the same position, keep looking.
break;
}
state = state->out;
}
return false;
}
/// @param l runtime state list
/// @param state state to update
/// @param subs pointers to subexpressions
///
/// @return true if "state" is already in list "l".
static bool state_in_list(nfa_list_T *l, nfa_state_T *state, regsubs_T *subs)
FUNC_ATTR_NONNULL_ALL
{
if (state->lastlist[nfa_ll_index] == l->id) {
if (!rex.nfa_has_backref || has_state_with_pos(l, state, subs, NULL)) {
return true;
}
}
return false;
}
// Offset used for "off" by addstate_here().
#define ADDSTATE_HERE_OFFSET 10
/// Add "state" and possibly what follows to state list ".".
///
/// @param l runtime state list
/// @param state state to update
/// @param subs_arg pointers to subexpressions
/// @param pim postponed look-behind match
/// @param off_arg byte offset, when -1 go to next line
///
/// @return "subs_arg", possibly copied into temp_subs.
/// NULL when recursiveness is too deep.
static regsubs_T *addstate(nfa_list_T *l, nfa_state_T *state, regsubs_T *subs_arg, nfa_pim_T *pim,
int off_arg)
FUNC_ATTR_NONNULL_ARG(1, 2) FUNC_ATTR_WARN_UNUSED_RESULT
{
int subidx;
int off = off_arg;
int add_here = false;
int listindex = 0;
int k;
int found = false;
nfa_thread_T *thread;
struct multipos save_multipos;
int save_in_use;
uint8_t *save_ptr;
int i;
regsub_T *sub;
regsubs_T *subs = subs_arg;
static regsubs_T temp_subs;
#ifdef REGEXP_DEBUG
int did_print = false;
#endif
static int depth = 0;
// This function is called recursively. When the depth is too much we run
// out of stack and crash, limit recursiveness here.
if (++depth >= 5000 || subs == NULL) {
depth--;
return NULL;
}
if (off_arg <= -ADDSTATE_HERE_OFFSET) {
add_here = true;
off = 0;
listindex = -(off_arg + ADDSTATE_HERE_OFFSET);
}
switch (state->c) {
case NFA_NCLOSE:
case NFA_MCLOSE:
case NFA_MCLOSE1:
case NFA_MCLOSE2:
case NFA_MCLOSE3:
case NFA_MCLOSE4:
case NFA_MCLOSE5:
case NFA_MCLOSE6:
case NFA_MCLOSE7:
case NFA_MCLOSE8:
case NFA_MCLOSE9:
case NFA_ZCLOSE:
case NFA_ZCLOSE1:
case NFA_ZCLOSE2:
case NFA_ZCLOSE3:
case NFA_ZCLOSE4:
case NFA_ZCLOSE5:
case NFA_ZCLOSE6:
case NFA_ZCLOSE7:
case NFA_ZCLOSE8:
case NFA_ZCLOSE9:
case NFA_MOPEN:
case NFA_ZEND:
case NFA_SPLIT:
case NFA_EMPTY:
// These nodes are not added themselves but their "out" and/or
// "out1" may be added below.
break;
case NFA_BOL:
case NFA_BOF:
// "^" won't match past end-of-line, don't bother trying.
// Except when at the end of the line, or when we are going to the
// next line for a look-behind match.
if (rex.input > rex.line
&& *rex.input != NUL
&& (nfa_endp == NULL
|| !REG_MULTI
|| rex.lnum == nfa_endp->se_u.pos.lnum)) {
goto skip_add;
}
FALLTHROUGH;
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_NOPEN:
case NFA_ZSTART:
// These nodes need to be added so that we can bail out when it
// was added to this list before at the same position to avoid an
// endless loop for "\(\)*"
default:
if (state->lastlist[nfa_ll_index] == l->id && state->c != NFA_SKIP) {
// This state is already in the list, don't add it again,
// unless it is an MOPEN that is used for a backreference or
// when there is a PIM. For NFA_MATCH check the position,
// lower position is preferred.
if (!rex.nfa_has_backref && pim == NULL && !l->has_pim
&& state->c != NFA_MATCH) {
// When called from addstate_here() do insert before
// existing states.
if (add_here) {
for (k = 0; k < l->n && k < listindex; k++) {
if (l->t[k].state->id == state->id) {
found = true;
break;
}
}
}
if (!add_here || found) {
skip_add:
#ifdef REGEXP_DEBUG
nfa_set_code(state->c);
fprintf(log_fd,
"> Not adding state %d to list %d. char %d: %s pim: %s has_pim: %d found: %d\n",
abs(state->id), l->id, state->c, code,
pim == NULL ? "NULL" : "yes", l->has_pim, found);
#endif
depth--;
return subs;
}
}
// Do not add the state again when it exists with the same
// positions.
if (has_state_with_pos(l, state, subs, pim)) {
goto skip_add;
}
}
// When there are backreferences or PIMs the number of states may
// be (a lot) bigger than anticipated.
if (l->n == l->len) {
const int newlen = l->len * 3 / 2 + 50;
const size_t newsize = (size_t)newlen * sizeof(nfa_thread_T);
if ((int64_t)(newsize >> 10) >= p_mmp) {
emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
depth--;
return NULL;
}
if (subs != &temp_subs) {
// "subs" may point into the current array, need to make a
// copy before it becomes invalid.
copy_sub(&temp_subs.norm, &subs->norm);
if (rex.nfa_has_zsubexpr) {
copy_sub(&temp_subs.synt, &subs->synt);
}
subs = &temp_subs;
}
nfa_thread_T *const newt = xrealloc(l->t, newsize);
l->t = newt;
l->len = newlen;
}
// add the state to the list
state->lastlist[nfa_ll_index] = l->id;
thread = &l->t[l->n++];
thread->state = state;
if (pim == NULL) {
thread->pim.result = NFA_PIM_UNUSED;
} else {
copy_pim(&thread->pim, pim);
l->has_pim = true;
}
copy_sub(&thread->subs.norm, &subs->norm);
if (rex.nfa_has_zsubexpr) {
copy_sub(&thread->subs.synt, &subs->synt);
}
#ifdef REGEXP_DEBUG
report_state("Adding", &thread->subs.norm, state, l->id, pim);
did_print = true;
#endif
}
#ifdef REGEXP_DEBUG
if (!did_print) {
report_state("Processing", &subs->norm, state, l->id, pim);
}
#endif
switch (state->c) {
case NFA_MATCH:
break;
case NFA_SPLIT:
// order matters here
subs = addstate(l, state->out, subs, pim, off_arg);
subs = addstate(l, state->out1, subs, pim, off_arg);
break;
case NFA_EMPTY:
case NFA_NOPEN:
case NFA_NCLOSE:
subs = addstate(l, state->out, subs, pim, off_arg);
break;
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_ZSTART:
if (state->c == NFA_ZSTART) {
subidx = 0;
sub = &subs->norm;
} else if (state->c >= NFA_ZOPEN && state->c <= NFA_ZOPEN9) {
subidx = state->c - NFA_ZOPEN;
sub = &subs->synt;
} else {
subidx = state->c - NFA_MOPEN;
sub = &subs->norm;
}
// avoid compiler warnings
save_ptr = NULL;
CLEAR_FIELD(save_multipos);
// Set the position (with "off" added) in the subexpression. Save
// and restore it when it was in use. Otherwise fill any gap.
if (REG_MULTI) {
if (subidx < sub->in_use) {
save_multipos = sub->list.multi[subidx];
save_in_use = -1;
} else {
save_in_use = sub->in_use;
for (i = sub->in_use; i < subidx; i++) {
sub->list.multi[i].start_lnum = -1;
sub->list.multi[i].end_lnum = -1;
}
sub->in_use = subidx + 1;
}
if (off == -1) {
sub->list.multi[subidx].start_lnum = rex.lnum + 1;
sub->list.multi[subidx].start_col = 0;
} else {
sub->list.multi[subidx].start_lnum = rex.lnum;
sub->list.multi[subidx].start_col =
(colnr_T)(rex.input - rex.line + off);
}
sub->list.multi[subidx].end_lnum = -1;
} else {
if (subidx < sub->in_use) {
save_ptr = sub->list.line[subidx].start;
save_in_use = -1;
} else {
save_in_use = sub->in_use;
for (i = sub->in_use; i < subidx; i++) {
sub->list.line[i].start = NULL;
sub->list.line[i].end = NULL;
}
sub->in_use = subidx + 1;
}
sub->list.line[subidx].start = rex.input + off;
}
subs = addstate(l, state->out, subs, pim, off_arg);
if (subs == NULL) {
break;
}
// "subs" may have changed, need to set "sub" again.
if (state->c >= NFA_ZOPEN && state->c <= NFA_ZOPEN9) {
sub = &subs->synt;
} else {
sub = &subs->norm;
}
if (save_in_use == -1) {
if (REG_MULTI) {
sub->list.multi[subidx] = save_multipos;
} else {
sub->list.line[subidx].start = save_ptr;
}
} else {
sub->in_use = save_in_use;
}
break;
case NFA_MCLOSE:
if (rex.nfa_has_zend
&& (REG_MULTI
? subs->norm.list.multi[0].end_lnum >= 0
: subs->norm.list.line[0].end != NULL)) {
// Do not overwrite the position set by \ze.
subs = addstate(l, state->out, subs, pim, off_arg);
break;
}
FALLTHROUGH;
case NFA_MCLOSE1:
case NFA_MCLOSE2:
case NFA_MCLOSE3:
case NFA_MCLOSE4:
case NFA_MCLOSE5:
case NFA_MCLOSE6:
case NFA_MCLOSE7:
case NFA_MCLOSE8:
case NFA_MCLOSE9:
case NFA_ZCLOSE:
case NFA_ZCLOSE1:
case NFA_ZCLOSE2:
case NFA_ZCLOSE3:
case NFA_ZCLOSE4:
case NFA_ZCLOSE5:
case NFA_ZCLOSE6:
case NFA_ZCLOSE7:
case NFA_ZCLOSE8:
case NFA_ZCLOSE9:
case NFA_ZEND:
if (state->c == NFA_ZEND) {
subidx = 0;
sub = &subs->norm;
} else if (state->c >= NFA_ZCLOSE && state->c <= NFA_ZCLOSE9) {
subidx = state->c - NFA_ZCLOSE;
sub = &subs->synt;
} else {
subidx = state->c - NFA_MCLOSE;
sub = &subs->norm;
}
// We don't fill in gaps here, there must have been an MOPEN that
// has done that.
save_in_use = sub->in_use;
if (sub->in_use <= subidx) {
sub->in_use = subidx + 1;
}
if (REG_MULTI) {
save_multipos = sub->list.multi[subidx];
if (off == -1) {
sub->list.multi[subidx].end_lnum = rex.lnum + 1;
sub->list.multi[subidx].end_col = 0;
} else {
sub->list.multi[subidx].end_lnum = rex.lnum;
sub->list.multi[subidx].end_col =
(colnr_T)(rex.input - rex.line + off);
}
// avoid compiler warnings
save_ptr = NULL;
} else {
save_ptr = sub->list.line[subidx].end;
sub->list.line[subidx].end = rex.input + off;
// avoid compiler warnings
CLEAR_FIELD(save_multipos);
}
subs = addstate(l, state->out, subs, pim, off_arg);
if (subs == NULL) {
break;
}
// "subs" may have changed, need to set "sub" again.
if (state->c >= NFA_ZCLOSE && state->c <= NFA_ZCLOSE9) {
sub = &subs->synt;
} else {
sub = &subs->norm;
}
if (REG_MULTI) {
sub->list.multi[subidx] = save_multipos;
} else {
sub->list.line[subidx].end = save_ptr;
}
sub->in_use = save_in_use;
break;
}
depth--;
return subs;
}
/// Like addstate(), but the new state(s) are put at position "*ip".
/// Used for zero-width matches, next state to use is the added one.
/// This makes sure the order of states to be tried does not change, which
/// matters for alternatives.
///
/// @param l runtime state list
/// @param state state to update
/// @param subs pointers to subexpressions
/// @param pim postponed look-behind match
static regsubs_T *addstate_here(nfa_list_T *l, nfa_state_T *state, regsubs_T *subs, nfa_pim_T *pim,
int *ip)
FUNC_ATTR_NONNULL_ARG(1, 2, 5) FUNC_ATTR_WARN_UNUSED_RESULT
{
int tlen = l->n;
int count;
int listidx = *ip;
// First add the state(s) at the end, so that we know how many there are.
// Pass the listidx as offset (avoids adding another argument to
// addstate()).
regsubs_T *r = addstate(l, state, subs, pim, -listidx - ADDSTATE_HERE_OFFSET);
if (r == NULL) {
return NULL;
}
// when "*ip" was at the end of the list, nothing to do
if (listidx + 1 == tlen) {
return r;
}
// re-order to put the new state at the current position
count = l->n - tlen;
if (count == 0) {
return r; // no state got added
}
if (count == 1) {
// overwrite the current state
l->t[listidx] = l->t[l->n - 1];
} else if (count > 1) {
if (l->n + count - 1 >= l->len) {
// not enough space to move the new states, reallocate the list
// and move the states to the right position
const int newlen = l->len * 3 / 2 + 50;
const size_t newsize = (size_t)newlen * sizeof(nfa_thread_T);
if ((int64_t)(newsize >> 10) >= p_mmp) {
emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
return NULL;
}
nfa_thread_T *const newl = xmalloc(newsize);
l->len = newlen;
memmove(&(newl[0]),
&(l->t[0]),
sizeof(nfa_thread_T) * (size_t)listidx);
memmove(&(newl[listidx]),
&(l->t[l->n - count]),
sizeof(nfa_thread_T) * (size_t)count);
memmove(&(newl[listidx + count]),
&(l->t[listidx + 1]),
sizeof(nfa_thread_T) * (size_t)(l->n - count - listidx - 1));
xfree(l->t);
l->t = newl;
} else {
// make space for new states, then move them from the
// end to the current position
memmove(&(l->t[listidx + count]),
&(l->t[listidx + 1]),
sizeof(nfa_thread_T) * (size_t)(l->n - listidx - 1));
memmove(&(l->t[listidx]),
&(l->t[l->n - 1]),
sizeof(nfa_thread_T) * (size_t)count);
}
}
l->n--;
*ip = listidx - 1;
return r;
}
// Check character class "class" against current character c.
static int check_char_class(int cls, int c)
{
switch (cls) {
case NFA_CLASS_ALNUM:
if (c >= 1 && c < 128 && isalnum(c)) {
return OK;
}
break;
case NFA_CLASS_ALPHA:
if (c >= 1 && c < 128 && isalpha(c)) {
return OK;
}
break;
case NFA_CLASS_BLANK:
if (c == ' ' || c == '\t') {
return OK;
}
break;
case NFA_CLASS_CNTRL:
if (c >= 1 && c <= 127 && iscntrl(c)) {
return OK;
}
break;
case NFA_CLASS_DIGIT:
if (ascii_isdigit(c)) {
return OK;
}
break;
case NFA_CLASS_GRAPH:
if (c >= 1 && c <= 127 && isgraph(c)) {
return OK;
}
break;
case NFA_CLASS_LOWER:
if (mb_islower(c) && c != 170 && c != 186) {
return OK;
}
break;
case NFA_CLASS_PRINT:
if (vim_isprintc(c)) {
return OK;
}
break;
case NFA_CLASS_PUNCT:
if (c >= 1 && c < 128 && ispunct(c)) {
return OK;
}
break;
case NFA_CLASS_SPACE:
if ((c >= 9 && c <= 13) || (c == ' ')) {
return OK;
}
break;
case NFA_CLASS_UPPER:
if (mb_isupper(c)) {
return OK;
}
break;
case NFA_CLASS_XDIGIT:
if (ascii_isxdigit(c)) {
return OK;
}
break;
case NFA_CLASS_TAB:
if (c == '\t') {
return OK;
}
break;
case NFA_CLASS_RETURN:
if (c == '\r') {
return OK;
}
break;
case NFA_CLASS_BACKSPACE:
if (c == '\b') {
return OK;
}
break;
case NFA_CLASS_ESCAPE:
if (c == ESC) {
return OK;
}
break;
case NFA_CLASS_IDENT:
if (vim_isIDc(c)) {
return OK;
}
break;
case NFA_CLASS_KEYWORD:
if (reg_iswordc(c)) {
return OK;
}
break;
case NFA_CLASS_FNAME:
if (vim_isfilec(c)) {
return OK;
}
break;
default:
// should not be here :P
siemsg(_(e_ill_char_class), (int64_t)cls);
return FAIL;
}
return FAIL;
}
/// Check for a match with subexpression "subidx".
///
/// @param sub pointers to subexpressions
/// @param bytelen out: length of match in bytes
///
/// @return true if it matches.
static int match_backref(regsub_T *sub, int subidx, int *bytelen)
{
int len;
if (sub->in_use <= subidx) {
retempty:
// backref was not set, match an empty string
*bytelen = 0;
return true;
}
if (REG_MULTI) {
if (sub->list.multi[subidx].start_lnum < 0
|| sub->list.multi[subidx].end_lnum < 0) {
goto retempty;
}
if (sub->list.multi[subidx].start_lnum == rex.lnum
&& sub->list.multi[subidx].end_lnum == rex.lnum) {
len = sub->list.multi[subidx].end_col
- sub->list.multi[subidx].start_col;
if (cstrncmp((char *)rex.line + sub->list.multi[subidx].start_col,
(char *)rex.input, &len) == 0) {
*bytelen = len;
return true;
}
} else {
if (match_with_backref(sub->list.multi[subidx].start_lnum,
sub->list.multi[subidx].start_col,
sub->list.multi[subidx].end_lnum,
sub->list.multi[subidx].end_col,
bytelen) == RA_MATCH) {
return true;
}
}
} else {
if (sub->list.line[subidx].start == NULL
|| sub->list.line[subidx].end == NULL) {
goto retempty;
}
len = (int)(sub->list.line[subidx].end - sub->list.line[subidx].start);
if (cstrncmp((char *)sub->list.line[subidx].start, (char *)rex.input, &len) == 0) {
*bytelen = len;
return true;
}
}
return false;
}
/// Check for a match with \z subexpression "subidx".
///
/// @param bytelen out: length of match in bytes
///
/// @return true if it matches.
static int match_zref(int subidx, int *bytelen)
{
int len;
cleanup_zsubexpr();
if (re_extmatch_in == NULL || re_extmatch_in->matches[subidx] == NULL) {
// backref was not set, match an empty string
*bytelen = 0;
return true;
}
len = (int)strlen((char *)re_extmatch_in->matches[subidx]);
if (cstrncmp((char *)re_extmatch_in->matches[subidx], (char *)rex.input, &len) == 0) {
*bytelen = len;
return true;
}
return false;
}
// Save list IDs for all NFA states of "prog" into "list".
// Also reset the IDs to zero.
// Only used for the recursive value lastlist[1].
static void nfa_save_listids(nfa_regprog_T *prog, int *list)
{
int i;
nfa_state_T *p;
// Order in the list is reverse, it's a bit faster that way.
p = &prog->state[0];
for (i = prog->nstate; --i >= 0;) {
list[i] = p->lastlist[1];
p->lastlist[1] = 0;
p++;
}
}
// Restore list IDs from "list" to all NFA states.
static void nfa_restore_listids(nfa_regprog_T *prog, const int *list)
{
int i;
nfa_state_T *p;
p = &prog->state[0];
for (i = prog->nstate; --i >= 0;) {
p->lastlist[1] = list[i];
p++;
}
}
static bool nfa_re_num_cmp(uintmax_t val, int op, uintmax_t pos)
{
if (op == 1) {
return pos > val;
}
if (op == 2) {
return pos < val;
}
return val == pos;
}
// Recursively call nfa_regmatch()
// "pim" is NULL or contains info about a Postponed Invisible Match (start
// position).
static int recursive_regmatch(nfa_state_T *state, nfa_pim_T *pim, nfa_regprog_T *prog,
regsubs_T *submatch, regsubs_T *m, int **listids, int *listids_len)
FUNC_ATTR_NONNULL_ARG(1, 3, 5, 6, 7)
{
const int save_reginput_col = (int)(rex.input - rex.line);
const int save_reglnum = rex.lnum;
const int save_nfa_match = nfa_match;
const int save_nfa_listid = rex.nfa_listid;
save_se_T *const save_nfa_endp = nfa_endp;
save_se_T endpos;
save_se_T *endposp = NULL;
int need_restore = false;
if (pim != NULL) {
// start at the position where the postponed match was
if (REG_MULTI) {
rex.input = rex.line + pim->end.pos.col;
} else {
rex.input = pim->end.ptr;
}
}
if (state->c == NFA_START_INVISIBLE_BEFORE
|| state->c == NFA_START_INVISIBLE_BEFORE_FIRST
|| state->c == NFA_START_INVISIBLE_BEFORE_NEG
|| state->c == NFA_START_INVISIBLE_BEFORE_NEG_FIRST) {
// The recursive match must end at the current position. When "pim" is
// not NULL it specifies the current position.
endposp = &endpos;
if (REG_MULTI) {
if (pim == NULL) {
endpos.se_u.pos.col = (int)(rex.input - rex.line);
endpos.se_u.pos.lnum = rex.lnum;
} else {
endpos.se_u.pos = pim->end.pos;
}
} else {
if (pim == NULL) {
endpos.se_u.ptr = rex.input;
} else {
endpos.se_u.ptr = pim->end.ptr;
}
}
// Go back the specified number of bytes, or as far as the
// start of the previous line, to try matching "\@<=" or
// not matching "\@<!". This is very inefficient, limit the number of
// bytes if possible.
if (state->val <= 0) {
if (REG_MULTI) {
rex.line = (uint8_t *)reg_getline(--rex.lnum);
if (rex.line == NULL) {
// can't go before the first line
rex.line = (uint8_t *)reg_getline(++rex.lnum);
}
}
rex.input = rex.line;
} else {
if (REG_MULTI && (int)(rex.input - rex.line) < state->val) {
// Not enough bytes in this line, go to end of
// previous line.
rex.line = (uint8_t *)reg_getline(--rex.lnum);
if (rex.line == NULL) {
// can't go before the first line
rex.line = (uint8_t *)reg_getline(++rex.lnum);
rex.input = rex.line;
} else {
rex.input = rex.line + strlen((char *)rex.line);
}
}
if ((int)(rex.input - rex.line) >= state->val) {
rex.input -= state->val;
rex.input -= utf_head_off((char *)rex.line, (char *)rex.input);
} else {
rex.input = rex.line;
}
}
}
#ifdef REGEXP_DEBUG
if (log_fd != stderr) {
fclose(log_fd);
}
log_fd = NULL;
#endif
// Have to clear the lastlist field of the NFA nodes, so that
// nfa_regmatch() and addstate() can run properly after recursion.
if (nfa_ll_index == 1) {
// Already calling nfa_regmatch() recursively. Save the lastlist[1]
// values and clear them.
if (*listids == NULL || *listids_len < prog->nstate) {
xfree(*listids);
*listids = xmalloc(sizeof(**listids) * (size_t)prog->nstate);
*listids_len = prog->nstate;
}
nfa_save_listids(prog, *listids);
need_restore = true;
// any value of rex.nfa_listid will do
} else {
// First recursive nfa_regmatch() call, switch to the second lastlist
// entry. Make sure rex.nfa_listid is different from a previous
// recursive call, because some states may still have this ID.
nfa_ll_index++;
if (rex.nfa_listid <= rex.nfa_alt_listid) {
rex.nfa_listid = rex.nfa_alt_listid;
}
}
// Call nfa_regmatch() to check if the current concat matches at this
// position. The concat ends with the node NFA_END_INVISIBLE
nfa_endp = endposp;
const int result = nfa_regmatch(prog, state->out, submatch, m);
if (need_restore) {
nfa_restore_listids(prog, *listids);
} else {
nfa_ll_index--;
rex.nfa_alt_listid = rex.nfa_listid;
}
// restore position in input text
rex.lnum = save_reglnum;
if (REG_MULTI) {
rex.line = (uint8_t *)reg_getline(rex.lnum);
}
rex.input = rex.line + save_reginput_col;
if (result != NFA_TOO_EXPENSIVE) {
nfa_match = save_nfa_match;
rex.nfa_listid = save_nfa_listid;
}
nfa_endp = save_nfa_endp;
#ifdef REGEXP_DEBUG
open_debug_log(result);
#endif
return result;
}
// Estimate the chance of a match with "state" failing.
// empty match: 0
// NFA_ANY: 1
// specific character: 99
static int failure_chance(nfa_state_T *state, int depth)
{
int c = state->c;
int l, r;
// detect looping
if (depth > 4) {
return 1;
}
switch (c) {
case NFA_SPLIT:
if (state->out->c == NFA_SPLIT || state->out1->c == NFA_SPLIT) {
// avoid recursive stuff
return 1;
}
// two alternatives, use the lowest failure chance
l = failure_chance(state->out, depth + 1);
r = failure_chance(state->out1, depth + 1);
return l < r ? l : r;
case NFA_ANY:
// matches anything, unlikely to fail
return 1;
case NFA_MATCH:
case NFA_MCLOSE:
case NFA_ANY_COMPOSING:
// empty match works always
return 0;
case NFA_START_INVISIBLE:
case NFA_START_INVISIBLE_FIRST:
case NFA_START_INVISIBLE_NEG:
case NFA_START_INVISIBLE_NEG_FIRST:
case NFA_START_INVISIBLE_BEFORE:
case NFA_START_INVISIBLE_BEFORE_FIRST:
case NFA_START_INVISIBLE_BEFORE_NEG:
case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
case NFA_START_PATTERN:
// recursive regmatch is expensive, use low failure chance
return 5;
case NFA_BOL:
case NFA_EOL:
case NFA_BOF:
case NFA_EOF:
case NFA_NEWL:
return 99;
case NFA_BOW:
case NFA_EOW:
return 90;
case NFA_MOPEN:
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_ZCLOSE:
case NFA_ZCLOSE1:
case NFA_ZCLOSE2:
case NFA_ZCLOSE3:
case NFA_ZCLOSE4:
case NFA_ZCLOSE5:
case NFA_ZCLOSE6:
case NFA_ZCLOSE7:
case NFA_ZCLOSE8:
case NFA_ZCLOSE9:
case NFA_NOPEN:
case NFA_MCLOSE1:
case NFA_MCLOSE2:
case NFA_MCLOSE3:
case NFA_MCLOSE4:
case NFA_MCLOSE5:
case NFA_MCLOSE6:
case NFA_MCLOSE7:
case NFA_MCLOSE8:
case NFA_MCLOSE9:
case NFA_NCLOSE:
return failure_chance(state->out, depth + 1);
case NFA_BACKREF1:
case NFA_BACKREF2:
case NFA_BACKREF3:
case NFA_BACKREF4:
case NFA_BACKREF5:
case NFA_BACKREF6:
case NFA_BACKREF7:
case NFA_BACKREF8:
case NFA_BACKREF9:
case NFA_ZREF1:
case NFA_ZREF2:
case NFA_ZREF3:
case NFA_ZREF4:
case NFA_ZREF5:
case NFA_ZREF6:
case NFA_ZREF7:
case NFA_ZREF8:
case NFA_ZREF9:
// backreferences don't match in many places
return 94;
case NFA_LNUM_GT:
case NFA_LNUM_LT:
case NFA_COL_GT:
case NFA_COL_LT:
case NFA_VCOL_GT:
case NFA_VCOL_LT:
case NFA_MARK_GT:
case NFA_MARK_LT:
case NFA_VISUAL:
// before/after positions don't match very often
return 85;
case NFA_LNUM:
return 90;
case NFA_CURSOR:
case NFA_COL:
case NFA_VCOL:
case NFA_MARK:
// specific positions rarely match
return 98;
case NFA_COMPOSING:
return 95;
default:
if (c > 0) {
// character match fails often
return 95;
}
}
// something else, includes character classes
return 50;
}
// Skip until the char "c" we know a match must start with.
static int skip_to_start(int c, colnr_T *colp)
{
const uint8_t *const s = (uint8_t *)cstrchr((char *)rex.line + *colp, c);
if (s == NULL) {
return FAIL;
}
*colp = (int)(s - rex.line);
return OK;
}
// Check for a match with match_text.
// Called after skip_to_start() has found regstart.
// Returns zero for no match, 1 for a match.
static int find_match_text(colnr_T *startcol, int regstart, uint8_t *match_text)
{
#define PTR2LEN(x) utf_ptr2len(x)
colnr_T col = *startcol;
int regstart_len = PTR2LEN((char *)rex.line + col);
while (true) {
bool match = true;
uint8_t *s1 = match_text;
uint8_t *s2 = rex.line + col + regstart_len; // skip regstart
while (*s1) {
int c1_len = PTR2LEN((char *)s1);
int c1 = utf_ptr2char((char *)s1);
int c2_len = PTR2LEN((char *)s2);
int c2 = utf_ptr2char((char *)s2);
if ((c1 != c2 && (!rex.reg_ic || utf_fold(c1) != utf_fold(c2)))
|| c1_len != c2_len) {
match = false;
break;
}
s1 += c1_len;
s2 += c2_len;
}
if (match
// check that no composing char follows
&& !utf_iscomposing(utf_ptr2char((char *)s2))) {
cleanup_subexpr();
if (REG_MULTI) {
rex.reg_startpos[0].lnum = rex.lnum;
rex.reg_startpos[0].col = col;
rex.reg_endpos[0].lnum = rex.lnum;
rex.reg_endpos[0].col = (colnr_T)(s2 - rex.line);
} else {
rex.reg_startp[0] = rex.line + col;
rex.reg_endp[0] = s2;
}
*startcol = col;
return 1L;
}
// Try finding regstart after the current match.
col += regstart_len; // skip regstart
if (skip_to_start(regstart, &col) == FAIL) {
break;
}
}
*startcol = col;
return 0L;
#undef PTR2LEN
}
static int nfa_did_time_out(void)
{
if (nfa_time_limit != NULL && profile_passed_limit(*nfa_time_limit)) {
if (nfa_timed_out != NULL) {
*nfa_timed_out = true;
}
return true;
}
return false;
}
/// Main matching routine.
///
/// Run NFA to determine whether it matches rex.input.
///
/// When "nfa_endp" is not NULL it is a required end-of-match position.
///
/// Return true if there is a match, false if there is no match,
/// NFA_TOO_EXPENSIVE if we end up with too many states.
/// When there is a match "submatch" contains the positions.
///
/// Note: Caller must ensure that: start != NULL.
static int nfa_regmatch(nfa_regprog_T *prog, nfa_state_T *start, regsubs_T *submatch, regsubs_T *m)
FUNC_ATTR_NONNULL_ARG(1, 2, 4)
{
int result = false;
int flag = 0;
bool go_to_nextline = false;
nfa_thread_T *t;
nfa_list_T list[2];
int listidx;
nfa_list_T *thislist;
nfa_list_T *nextlist;
int *listids = NULL;
int listids_len = 0;
nfa_state_T *add_state;
bool add_here;
int add_count;
int add_off = 0;
int toplevel = start->c == NFA_MOPEN;
regsubs_T *r;
// Some patterns may take a long time to match, especially when using
// recursive_regmatch(). Allow interrupting them with CTRL-C.
reg_breakcheck();
if (got_int) {
return false;
}
if (nfa_did_time_out()) {
return false;
}
#ifdef NFA_REGEXP_DEBUG_LOG
FILE *debug = fopen(NFA_REGEXP_DEBUG_LOG, "a");
if (debug == NULL) {
semsg("(NFA) COULD NOT OPEN %s!", NFA_REGEXP_DEBUG_LOG);
return false;
}
#endif
nfa_match = false;
// Allocate memory for the lists of nodes.
size_t size = (size_t)(prog->nstate + 1) * sizeof(nfa_thread_T);
list[0].t = xmalloc(size);
list[0].len = prog->nstate + 1;
list[1].t = xmalloc(size);
list[1].len = prog->nstate + 1;
#ifdef REGEXP_DEBUG
log_fd = fopen(NFA_REGEXP_RUN_LOG, "a");
if (log_fd == NULL) {
emsg(_(e_log_open_failed));
log_fd = stderr;
}
fprintf(log_fd, "**********************************\n");
nfa_set_code(start->c);
fprintf(log_fd, " RUNNING nfa_regmatch() starting with state %d, code %s\n",
abs(start->id), code);
fprintf(log_fd, "**********************************\n");
#endif
thislist = &list[0];
thislist->n = 0;
thislist->has_pim = false;
nextlist = &list[1];
nextlist->n = 0;
nextlist->has_pim = false;
#ifdef REGEXP_DEBUG
fprintf(log_fd, "(---) STARTSTATE first\n");
#endif
thislist->id = rex.nfa_listid + 1;
// Inline optimized code for addstate(thislist, start, m, 0) if we know
// it's the first MOPEN.
if (toplevel) {
if (REG_MULTI) {
m->norm.list.multi[0].start_lnum = rex.lnum;
m->norm.list.multi[0].start_col = (colnr_T)(rex.input - rex.line);
m->norm.orig_start_col = m->norm.list.multi[0].start_col;
} else {
m->norm.list.line[0].start = rex.input;
}
m->norm.in_use = 1;
r = addstate(thislist, start->out, m, NULL, 0);
} else {
r = addstate(thislist, start, m, NULL, 0);
}
if (r == NULL) {
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
#define ADD_STATE_IF_MATCH(state) \
if (result) { \
add_state = (state)->out; \
add_off = clen; \
}
// Run for each character.
while (true) {
int curc = utf_ptr2char((char *)rex.input);
int clen = utfc_ptr2len((char *)rex.input);
if (curc == NUL) {
clen = 0;
go_to_nextline = false;
}
// swap lists
thislist = &list[flag];
nextlist = &list[flag ^= 1];
nextlist->n = 0; // clear nextlist
nextlist->has_pim = false;
rex.nfa_listid++;
if (prog->re_engine == AUTOMATIC_ENGINE
&& (rex.nfa_listid >= NFA_MAX_STATES)) {
// Too many states, retry with old engine.
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
thislist->id = rex.nfa_listid;
nextlist->id = rex.nfa_listid + 1;
#ifdef REGEXP_DEBUG
fprintf(log_fd, "------------------------------------------\n");
fprintf(log_fd, ">>> Reginput is \"%s\"\n", rex.input);
fprintf(log_fd,
">>> Advanced one character... Current char is %c (code %d) \n",
curc,
(int)curc);
fprintf(log_fd, ">>> Thislist has %d states available: ", thislist->n);
{
int i;
for (i = 0; i < thislist->n; i++) {
fprintf(log_fd, "%d ", abs(thislist->t[i].state->id));
}
}
fprintf(log_fd, "\n");
#endif
#ifdef NFA_REGEXP_DEBUG_LOG
fprintf(debug, "\n-------------------\n");
#endif
// If the state lists are empty we can stop.
if (thislist->n == 0) {
break;
}
// compute nextlist
for (listidx = 0; listidx < thislist->n; listidx++) {
// If the list gets very long there probably is something wrong.
// At least allow interrupting with CTRL-C.
reg_breakcheck();
if (got_int) {
break;
}
if (nfa_time_limit != NULL && ++nfa_time_count == 20) {
nfa_time_count = 0;
if (nfa_did_time_out()) {
break;
}
}
t = &thislist->t[listidx];
#ifdef NFA_REGEXP_DEBUG_LOG
nfa_set_code(t->state->c);
fprintf(debug, "%s, ", code);
#endif
#ifdef REGEXP_DEBUG
{
int col;
if (t->subs.norm.in_use <= 0) {
col = -1;
} else if (REG_MULTI) {
col = t->subs.norm.list.multi[0].start_col;
} else {
col = (int)(t->subs.norm.list.line[0].start - rex.line);
}
nfa_set_code(t->state->c);
fprintf(log_fd, "(%d) char %d %s (start col %d)%s... \n",
abs(t->state->id), (int)t->state->c, code, col,
pim_info(&t->pim));
}
#endif
// Handle the possible codes of the current state.
// The most important is NFA_MATCH.
add_state = NULL;
add_here = false;
add_count = 0;
switch (t->state->c) {
case NFA_MATCH:
// If the match is not at the start of the line, ends before a
// composing characters and rex.reg_icombine is not set, that
// is not really a match.
if (!rex.reg_icombine
&& rex.input != rex.line
&& utf_iscomposing(curc)) {
break;
}
nfa_match = true;
copy_sub(&submatch->norm, &t->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub(&submatch->synt, &t->subs.synt);
}
#ifdef REGEXP_DEBUG
log_subsexpr(&t->subs);
#endif
// Found the left-most longest match, do not look at any other
// states at this position. When the list of states is going
// to be empty quit without advancing, so that "rex.input" is
// correct.
if (nextlist->n == 0) {
clen = 0;
}
goto nextchar;
case NFA_END_INVISIBLE:
case NFA_END_INVISIBLE_NEG:
case NFA_END_PATTERN:
// This is only encountered after a NFA_START_INVISIBLE or
// NFA_START_INVISIBLE_BEFORE node.
// They surround a zero-width group, used with "\@=", "\&",
// "\@!", "\@<=" and "\@<!".
// If we got here, it means that the current "invisible" group
// finished successfully, so return control to the parent
// nfa_regmatch(). For a look-behind match only when it ends
// in the position in "nfa_endp".
// Submatches are stored in *m, and used in the parent call.
#ifdef REGEXP_DEBUG
if (nfa_endp != NULL) {
if (REG_MULTI) {
fprintf(log_fd,
"Current lnum: %d, endp lnum: %d;"
" current col: %d, endp col: %d\n",
(int)rex.lnum,
(int)nfa_endp->se_u.pos.lnum,
(int)(rex.input - rex.line),
nfa_endp->se_u.pos.col);
} else {
fprintf(log_fd, "Current col: %d, endp col: %d\n",
(int)(rex.input - rex.line),
(int)(nfa_endp->se_u.ptr - rex.input));
}
}
#endif
// If "nfa_endp" is set it's only a match if it ends at
// "nfa_endp"
if (nfa_endp != NULL
&& (REG_MULTI
? (rex.lnum != nfa_endp->se_u.pos.lnum
|| (int)(rex.input - rex.line) != nfa_endp->se_u.pos.col)
: rex.input != nfa_endp->se_u.ptr)) {
break;
}
// do not set submatches for \@!
if (t->state->c != NFA_END_INVISIBLE_NEG) {
copy_sub(&m->norm, &t->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub(&m->synt, &t->subs.synt);
}
}
#ifdef REGEXP_DEBUG
fprintf(log_fd, "Match found:\n");
log_subsexpr(m);
#endif
nfa_match = true;
// See comment above at "goto nextchar".
if (nextlist->n == 0) {
clen = 0;
}
goto nextchar;
case NFA_START_INVISIBLE:
case NFA_START_INVISIBLE_FIRST:
case NFA_START_INVISIBLE_NEG:
case NFA_START_INVISIBLE_NEG_FIRST:
case NFA_START_INVISIBLE_BEFORE:
case NFA_START_INVISIBLE_BEFORE_FIRST:
case NFA_START_INVISIBLE_BEFORE_NEG:
case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
#ifdef REGEXP_DEBUG
fprintf(log_fd, "Failure chance invisible: %d, what follows: %d\n",
failure_chance(t->state->out, 0),
failure_chance(t->state->out1->out, 0));
#endif
// Do it directly if there already is a PIM or when
// nfa_postprocess() detected it will work better.
if (t->pim.result != NFA_PIM_UNUSED
|| t->state->c == NFA_START_INVISIBLE_FIRST
|| t->state->c == NFA_START_INVISIBLE_NEG_FIRST
|| t->state->c == NFA_START_INVISIBLE_BEFORE_FIRST
|| t->state->c == NFA_START_INVISIBLE_BEFORE_NEG_FIRST) {
int in_use = m->norm.in_use;
// Copy submatch info for the recursive call, opposite
// of what happens on success below.
copy_sub_off(&m->norm, &t->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&m->synt, &t->subs.synt);
}
// First try matching the invisible match, then what
// follows.
result = recursive_regmatch(t->state, NULL, prog, submatch, m,
&listids, &listids_len);
if (result == NFA_TOO_EXPENSIVE) {
nfa_match = result;
goto theend;
}
// for \@! and \@<! it is a match when the result is
// false
if (result != (t->state->c == NFA_START_INVISIBLE_NEG
|| t->state->c == NFA_START_INVISIBLE_NEG_FIRST
|| t->state->c
== NFA_START_INVISIBLE_BEFORE_NEG
|| t->state->c
== NFA_START_INVISIBLE_BEFORE_NEG_FIRST)) {
// Copy submatch info from the recursive call
copy_sub_off(&t->subs.norm, &m->norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&t->subs.synt, &m->synt);
}
// If the pattern has \ze and it matched in the
// sub pattern, use it.
copy_ze_off(&t->subs.norm, &m->norm);
// t->state->out1 is the corresponding
// END_INVISIBLE node; Add its out to the current
// list (zero-width match).
add_here = true;
add_state = t->state->out1->out;
}
m->norm.in_use = in_use;
} else {
nfa_pim_T pim;
// First try matching what follows. Only if a match
// is found verify the invisible match matches. Add a
// nfa_pim_T to the following states, it contains info
// about the invisible match.
pim.state = t->state;
pim.result = NFA_PIM_TODO;
pim.subs.norm.in_use = 0;
pim.subs.synt.in_use = 0;
if (REG_MULTI) {
pim.end.pos.col = (int)(rex.input - rex.line);
pim.end.pos.lnum = rex.lnum;
} else {
pim.end.ptr = rex.input;
}
// t->state->out1 is the corresponding END_INVISIBLE
// node; Add its out to the current list (zero-width
// match).
if (addstate_here(thislist, t->state->out1->out, &t->subs,
&pim, &listidx) == NULL) {
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
}
break;
case NFA_START_PATTERN: {
nfa_state_T *skip = NULL;
#ifdef REGEXP_DEBUG
int skip_lid = 0;
#endif
// There is no point in trying to match the pattern if the
// output state is not going to be added to the list.
if (state_in_list(nextlist, t->state->out1->out, &t->subs)) {
skip = t->state->out1->out;
#ifdef REGEXP_DEBUG
skip_lid = nextlist->id;
#endif
} else if (state_in_list(nextlist,
t->state->out1->out->out, &t->subs)) {
skip = t->state->out1->out->out;
#ifdef REGEXP_DEBUG
skip_lid = nextlist->id;
#endif
} else if (state_in_list(thislist,
t->state->out1->out->out, &t->subs)) {
skip = t->state->out1->out->out;
#ifdef REGEXP_DEBUG
skip_lid = thislist->id;
#endif
}
if (skip != NULL) {
#ifdef REGEXP_DEBUG
nfa_set_code(skip->c);
fprintf(log_fd,
"> Not trying to match pattern, output state %d is already in list %d. char %d: %s\n",
abs(skip->id), skip_lid, skip->c, code);
#endif
break;
}
// Copy submatch info to the recursive call, opposite of what
// happens afterwards.
copy_sub_off(&m->norm, &t->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&m->synt, &t->subs.synt);
}
// First try matching the pattern.
result = recursive_regmatch(t->state, NULL, prog, submatch, m,
&listids, &listids_len);
if (result == NFA_TOO_EXPENSIVE) {
nfa_match = result;
goto theend;
}
if (result) {
int bytelen;
#ifdef REGEXP_DEBUG
fprintf(log_fd, "NFA_START_PATTERN matches:\n");
log_subsexpr(m);
#endif
// Copy submatch info from the recursive call
copy_sub_off(&t->subs.norm, &m->norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&t->subs.synt, &m->synt);
}
// Now we need to skip over the matched text and then
// continue with what follows.
if (REG_MULTI) {
// TODO(RE): multi-line match
bytelen = m->norm.list.multi[0].end_col
- (int)(rex.input - rex.line);
} else {
bytelen = (int)(m->norm.list.line[0].end - rex.input);
}
#ifdef REGEXP_DEBUG
fprintf(log_fd, "NFA_START_PATTERN length: %d\n", bytelen);
#endif
if (bytelen == 0) {
// empty match, output of corresponding
// NFA_END_PATTERN/NFA_SKIP to be used at current
// position
add_here = true;
add_state = t->state->out1->out->out;
} else if (bytelen <= clen) {
// match current character, output of corresponding
// NFA_END_PATTERN to be used at next position.
add_state = t->state->out1->out->out;
add_off = clen;
} else {
// skip over the matched characters, set character
// count in NFA_SKIP
add_state = t->state->out1->out;
add_off = bytelen;
add_count = bytelen - clen;
}
}
break;
}
case NFA_BOL:
if (rex.input == rex.line) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_EOL:
if (curc == NUL) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_BOW:
result = true;
if (curc == NUL) {
result = false;
} else {
int this_class;
// Get class of current and previous char (if it exists).
this_class = mb_get_class_tab((char *)rex.input, rex.reg_buf->b_chartab);
if (this_class <= 1) {
result = false;
} else if (reg_prev_class() == this_class) {
result = false;
}
}
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_EOW:
result = true;
if (rex.input == rex.line) {
result = false;
} else {
int this_class, prev_class;
// Get class of current and previous char (if it exists).
this_class = mb_get_class_tab((char *)rex.input, rex.reg_buf->b_chartab);
prev_class = reg_prev_class();
if (this_class == prev_class
|| prev_class == 0 || prev_class == 1) {
result = false;
}
}
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_BOF:
if (rex.lnum == 0 && rex.input == rex.line
&& (!REG_MULTI || rex.reg_firstlnum == 1)) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_EOF:
if (rex.lnum == rex.reg_maxline && curc == NUL) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_COMPOSING: {
int mc = curc;
int len = 0;
nfa_state_T *end;
nfa_state_T *sta;
int cchars[MAX_MCO];
int ccount = 0;
int j;
sta = t->state->out;
len = 0;
if (utf_iscomposing(sta->c)) {
// Only match composing character(s), ignore base
// character. Used for ".{composing}" and "{composing}"
// (no preceding character).
len += utf_char2len(mc);
}
if (rex.reg_icombine && len == 0) {
// If \Z was present, then ignore composing characters.
// When ignoring the base character this always matches.
if (sta->c != curc) {
result = FAIL;
} else {
result = OK;
}
while (sta->c != NFA_END_COMPOSING) {
sta = sta->out;
}
} else if (len > 0 || mc == sta->c) {
// Check base character matches first, unless ignored.
if (len == 0) {
len += utf_char2len(mc);
sta = sta->out;
}
// We don't care about the order of composing characters.
// Get them into cchars[] first.
while (len < clen) {
mc = utf_ptr2char((char *)rex.input + len);
cchars[ccount++] = mc;
len += utf_char2len(mc);
if (ccount == MAX_MCO) {
break;
}
}
// Check that each composing char in the pattern matches a
// composing char in the text. We do not check if all
// composing chars are matched.
result = OK;
while (sta->c != NFA_END_COMPOSING) {
for (j = 0; j < ccount; j++) {
if (cchars[j] == sta->c) {
break;
}
}
if (j == ccount) {
result = FAIL;
break;
}
sta = sta->out;
}
} else {
result = FAIL;
}
end = t->state->out1; // NFA_END_COMPOSING
ADD_STATE_IF_MATCH(end);
break;
}
case NFA_NEWL:
if (curc == NUL && !rex.reg_line_lbr && REG_MULTI
&& rex.lnum <= rex.reg_maxline) {
go_to_nextline = true;
// Pass -1 for the offset, which means taking the position
// at the start of the next line.
add_state = t->state->out;
add_off = -1;
} else if (curc == '\n' && rex.reg_line_lbr) {
// match \n as if it is an ordinary character
add_state = t->state->out;
add_off = 1;
}
break;
case NFA_START_COLL:
case NFA_START_NEG_COLL: {
// What follows is a list of characters, until NFA_END_COLL.
// One of them must match or none of them must match.
nfa_state_T *state;
int result_if_matched;
int c1, c2;
// Never match EOL. If it's part of the collection it is added
// as a separate state with an OR.
if (curc == NUL) {
break;
}
state = t->state->out;
result_if_matched = (t->state->c == NFA_START_COLL);
while (true) {
if (state->c == NFA_COMPOSING) {
int mc = curc;
int len = 0;
nfa_state_T *end;
nfa_state_T *sta;
int cchars[MAX_MCO];
int ccount = 0;
int j;
sta = t->state->out->out;
if (utf_iscomposing(sta->c)) {
// Only match composing character(s), ignore base
// character. Used for ".{composing}" and "{composing}"
// (no preceding character).
len += utf_char2len(mc);
}
if (rex.reg_icombine && len == 0) {
// If \Z was present, then ignore composing characters.
// When ignoring the base character this always matches.
if (sta->c != curc) {
result = FAIL;
} else {
result = OK;
}
while (sta->c != NFA_END_COMPOSING) {
sta = sta->out;
}
}
// Check base character matches first, unless ignored.
else if (len > 0 || mc == sta->c) {
if (len == 0) {
len += utf_char2len(mc);
sta = sta->out;
}
// We don't care about the order of composing characters.
// Get them into cchars[] first.
while (len < clen) {
mc = utf_ptr2char((char *)rex.input + len);
cchars[ccount++] = mc;
len += utf_char2len(mc);
if (ccount == MAX_MCO) {
break;
}
}
// Check that each composing char in the pattern matches a
// composing char in the text. We do not check if all
// composing chars are matched.
result = OK;
while (sta->c != NFA_END_COMPOSING) {
for (j = 0; j < ccount; j++) {
if (cchars[j] == sta->c) {
break;
}
}
if (j == ccount) {
result = FAIL;
break;
}
sta = sta->out;
}
} else {
result = FAIL;
}
if (t->state->out->out1->c == NFA_END_COMPOSING) {
end = t->state->out->out1;
ADD_STATE_IF_MATCH(end);
}
break;
}
if (state->c == NFA_END_COLL) {
result = !result_if_matched;
break;
}
if (state->c == NFA_RANGE_MIN) {
c1 = state->val;
state = state->out; // advance to NFA_RANGE_MAX
c2 = state->val;
#ifdef REGEXP_DEBUG
fprintf(log_fd, "NFA_RANGE_MIN curc=%d c1=%d c2=%d\n",
curc, c1, c2);
#endif
if (curc >= c1 && curc <= c2) {
result = result_if_matched;
break;
}
if (rex.reg_ic) {
int curc_low = utf_fold(curc);
int done = false;
for (; c1 <= c2; c1++) {
if (utf_fold(c1) == curc_low) {
result = result_if_matched;
done = true;
break;
}
}
if (done) {
break;
}
}
} else if (state->c < 0 ? check_char_class(state->c, curc)
: (curc == state->c
|| (rex.reg_ic
&& utf_fold(curc) == utf_fold(state->c)))) {
result = result_if_matched;
break;
}
state = state->out;
}
if (result) {
// next state is in out of the NFA_END_COLL, out1 of
// START points to the END state
add_state = t->state->out1->out;
add_off = clen;
}
break;
}
case NFA_ANY:
// Any char except '\0', (end of input) does not match.
if (curc > 0) {
add_state = t->state->out;
add_off = clen;
}
break;
case NFA_ANY_COMPOSING:
// On a composing character skip over it. Otherwise do
// nothing. Always matches.
if (utf_iscomposing(curc)) {
add_off = clen;
} else {
add_here = true;
add_off = 0;
}
add_state = t->state->out;
break;
// Character classes like \a for alpha, \d for digit etc.
case NFA_IDENT: // \i
result = vim_isIDc(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_SIDENT: // \I
result = !ascii_isdigit(curc) && vim_isIDc(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_KWORD: // \k
result = vim_iswordp_buf((char *)rex.input, rex.reg_buf);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_SKWORD: // \K
result = !ascii_isdigit(curc)
&& vim_iswordp_buf((char *)rex.input, rex.reg_buf);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_FNAME: // \f
result = vim_isfilec(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_SFNAME: // \F
result = !ascii_isdigit(curc) && vim_isfilec(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_PRINT: // \p
result = vim_isprintc(utf_ptr2char((char *)rex.input));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_SPRINT: // \P
result = !ascii_isdigit(curc) && vim_isprintc(utf_ptr2char((char *)rex.input));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_WHITE: // \s
result = ascii_iswhite(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NWHITE: // \S
result = curc != NUL && !ascii_iswhite(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_DIGIT: // \d
result = ri_digit(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NDIGIT: // \D
result = curc != NUL && !ri_digit(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_HEX: // \x
result = ri_hex(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NHEX: // \X
result = curc != NUL && !ri_hex(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_OCTAL: // \o
result = ri_octal(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NOCTAL: // \O
result = curc != NUL && !ri_octal(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_WORD: // \w
result = ri_word(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NWORD: // \W
result = curc != NUL && !ri_word(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_HEAD: // \h
result = ri_head(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NHEAD: // \H
result = curc != NUL && !ri_head(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_ALPHA: // \a
result = ri_alpha(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NALPHA: // \A
result = curc != NUL && !ri_alpha(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_LOWER: // \l
result = ri_lower(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NLOWER: // \L
result = curc != NUL && !ri_lower(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_UPPER: // \u
result = ri_upper(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NUPPER: // \U
result = curc != NUL && !ri_upper(curc);
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_LOWER_IC: // [a-z]
result = ri_lower(curc) || (rex.reg_ic && ri_upper(curc));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NLOWER_IC: // [^a-z]
result = curc != NUL
&& !(ri_lower(curc) || (rex.reg_ic && ri_upper(curc)));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_UPPER_IC: // [A-Z]
result = ri_upper(curc) || (rex.reg_ic && ri_lower(curc));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_NUPPER_IC: // [^A-Z]
result = curc != NUL
&& !(ri_upper(curc) || (rex.reg_ic && ri_lower(curc)));
ADD_STATE_IF_MATCH(t->state);
break;
case NFA_BACKREF1:
case NFA_BACKREF2:
case NFA_BACKREF3:
case NFA_BACKREF4:
case NFA_BACKREF5:
case NFA_BACKREF6:
case NFA_BACKREF7:
case NFA_BACKREF8:
case NFA_BACKREF9:
case NFA_ZREF1:
case NFA_ZREF2:
case NFA_ZREF3:
case NFA_ZREF4:
case NFA_ZREF5:
case NFA_ZREF6:
case NFA_ZREF7:
case NFA_ZREF8:
case NFA_ZREF9:
// \1 .. \9 \z1 .. \z9
{
int subidx;
int bytelen;
if (t->state->c <= NFA_BACKREF9) {
subidx = t->state->c - NFA_BACKREF1 + 1;
result = match_backref(&t->subs.norm, subidx, &bytelen);
} else {
subidx = t->state->c - NFA_ZREF1 + 1;
result = match_zref(subidx, &bytelen);
}
if (result) {
if (bytelen == 0) {
// empty match always works, output of NFA_SKIP to be
// used next
add_here = true;
add_state = t->state->out->out;
} else if (bytelen <= clen) {
// match current character, jump ahead to out of
// NFA_SKIP
add_state = t->state->out->out;
add_off = clen;
} else {
// skip over the matched characters, set character
// count in NFA_SKIP
add_state = t->state->out;
add_off = bytelen;
add_count = bytelen - clen;
}
}
break;
}
case NFA_SKIP:
// character of previous matching \1 .. \9 or \@>
if (t->count - clen <= 0) {
// end of match, go to what follows
add_state = t->state->out;
add_off = clen;
} else {
// add state again with decremented count
add_state = t->state;
add_off = 0;
add_count = t->count - clen;
}
break;
case NFA_LNUM:
case NFA_LNUM_GT:
case NFA_LNUM_LT:
assert(t->state->val >= 0
&& !((rex.reg_firstlnum > 0
&& rex.lnum > LONG_MAX - rex.reg_firstlnum)
|| (rex.reg_firstlnum < 0
&& rex.lnum < LONG_MIN + rex.reg_firstlnum))
&& rex.lnum + rex.reg_firstlnum >= 0);
result = (REG_MULTI
&& nfa_re_num_cmp((uintmax_t)t->state->val,
t->state->c - NFA_LNUM,
(uintmax_t)rex.lnum + (uintmax_t)rex.reg_firstlnum));
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_COL:
case NFA_COL_GT:
case NFA_COL_LT:
assert(t->state->val >= 0
&& rex.input >= rex.line
&& (uintmax_t)(rex.input - rex.line) <= UINTMAX_MAX - 1);
result = nfa_re_num_cmp((uintmax_t)t->state->val,
t->state->c - NFA_COL,
(uintmax_t)(rex.input - rex.line + 1));
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_VCOL:
case NFA_VCOL_GT:
case NFA_VCOL_LT: {
int op = t->state->c - NFA_VCOL;
colnr_T col = (colnr_T)(rex.input - rex.line);
// Bail out quickly when there can't be a match, avoid the overhead of
// win_linetabsize() on long lines.
if (op != 1 && col > t->state->val * MB_MAXBYTES) {
break;
}
result = false;
win_T *wp = rex.reg_win == NULL ? curwin : rex.reg_win;
if (op == 1 && col - 1 > t->state->val && col > 100) {
int64_t ts = (int64_t)wp->w_buffer->b_p_ts;
// Guess that a character won't use more columns than 'tabstop',
// with a minimum of 4.
if (ts < 4) {
ts = 4;
}
result = col > t->state->val * ts;
}
if (!result) {
int lts = win_linetabsize(wp, rex.reg_firstlnum + rex.lnum, (char *)rex.line, col);
assert(t->state->val >= 0);
result = nfa_re_num_cmp((uintmax_t)t->state->val, op, (uintmax_t)lts + 1);
}
if (result) {
add_here = true;
add_state = t->state->out;
}
}
break;
case NFA_MARK:
case NFA_MARK_GT:
case NFA_MARK_LT: {
size_t col = REG_MULTI ? (size_t)(rex.input - rex.line) : 0;
fmark_T *fm = mark_get(rex.reg_buf, curwin, NULL, kMarkBufLocal, t->state->val);
// Line may have been freed, get it again.
if (REG_MULTI) {
rex.line = (uint8_t *)reg_getline(rex.lnum);
rex.input = rex.line + col;
}
// Compare the mark position to the match position, if the mark
// exists and mark is set in reg_buf.
if (fm != NULL && fm->mark.lnum > 0) {
pos_T *pos = &fm->mark;
const colnr_T pos_col = pos->lnum == rex.lnum + rex.reg_firstlnum
&& pos->col == MAXCOL
? (colnr_T)strlen(reg_getline(pos->lnum - rex.reg_firstlnum))
: pos->col;
result = pos->lnum == rex.lnum + rex.reg_firstlnum
? (pos_col == (colnr_T)(rex.input - rex.line)
? t->state->c == NFA_MARK
: (pos_col < (colnr_T)(rex.input - rex.line)
? t->state->c == NFA_MARK_GT
: t->state->c == NFA_MARK_LT))
: (pos->lnum < rex.lnum + rex.reg_firstlnum
? t->state->c == NFA_MARK_GT
: t->state->c == NFA_MARK_LT);
if (result) {
add_here = true;
add_state = t->state->out;
}
}
break;
}
case NFA_CURSOR:
result = rex.reg_win != NULL
&& (rex.lnum + rex.reg_firstlnum == rex.reg_win->w_cursor.lnum)
&& ((colnr_T)(rex.input - rex.line) == rex.reg_win->w_cursor.col);
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_VISUAL:
result = reg_match_visual();
if (result) {
add_here = true;
add_state = t->state->out;
}
break;
case NFA_MOPEN1:
case NFA_MOPEN2:
case NFA_MOPEN3:
case NFA_MOPEN4:
case NFA_MOPEN5:
case NFA_MOPEN6:
case NFA_MOPEN7:
case NFA_MOPEN8:
case NFA_MOPEN9:
case NFA_ZOPEN:
case NFA_ZOPEN1:
case NFA_ZOPEN2:
case NFA_ZOPEN3:
case NFA_ZOPEN4:
case NFA_ZOPEN5:
case NFA_ZOPEN6:
case NFA_ZOPEN7:
case NFA_ZOPEN8:
case NFA_ZOPEN9:
case NFA_NOPEN:
case NFA_ZSTART:
// These states are only added to be able to bail out when
// they are added again, nothing is to be done.
break;
default: // regular character
{
int c = t->state->c;
#ifdef REGEXP_DEBUG
if (c < 0) {
siemsg("INTERNAL: Negative state char: %" PRId64, (int64_t)c);
}
#endif
result = (c == curc);
if (!result && rex.reg_ic) {
result = utf_fold(c) == utf_fold(curc);
}
// If rex.reg_icombine is not set only skip over the character
// itself. When it is set skip over composing characters.
if (result && !rex.reg_icombine) {
clen = utf_ptr2len((char *)rex.input);
}
ADD_STATE_IF_MATCH(t->state);
break;
}
} // switch (t->state->c)
if (add_state != NULL) {
nfa_pim_T *pim;
nfa_pim_T pim_copy;
if (t->pim.result == NFA_PIM_UNUSED) {
pim = NULL;
} else {
pim = &t->pim;
}
// Handle the postponed invisible match if the match might end
// without advancing and before the end of the line.
if (pim != NULL && (clen == 0 || match_follows(add_state, 0))) {
if (pim->result == NFA_PIM_TODO) {
#ifdef REGEXP_DEBUG
fprintf(log_fd, "\n");
fprintf(log_fd, "==================================\n");
fprintf(log_fd, "Postponed recursive nfa_regmatch()\n");
fprintf(log_fd, "\n");
#endif
result = recursive_regmatch(pim->state, pim, prog, submatch, m,
&listids, &listids_len);
pim->result = result ? NFA_PIM_MATCH : NFA_PIM_NOMATCH;
// for \@! and \@<! it is a match when the result is
// false
if (result != (pim->state->c == NFA_START_INVISIBLE_NEG
|| pim->state->c == NFA_START_INVISIBLE_NEG_FIRST
|| pim->state->c
== NFA_START_INVISIBLE_BEFORE_NEG
|| pim->state->c
== NFA_START_INVISIBLE_BEFORE_NEG_FIRST)) {
// Copy submatch info from the recursive call
copy_sub_off(&pim->subs.norm, &m->norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&pim->subs.synt, &m->synt);
}
}
} else {
result = (pim->result == NFA_PIM_MATCH);
#ifdef REGEXP_DEBUG
fprintf(log_fd, "\n");
fprintf(log_fd,
"Using previous recursive nfa_regmatch() result, result == %d\n",
pim->result);
fprintf(log_fd, "MATCH = %s\n", result ? "OK" : "false");
fprintf(log_fd, "\n");
#endif
}
// for \@! and \@<! it is a match when result is false
if (result != (pim->state->c == NFA_START_INVISIBLE_NEG
|| pim->state->c == NFA_START_INVISIBLE_NEG_FIRST
|| pim->state->c
== NFA_START_INVISIBLE_BEFORE_NEG
|| pim->state->c
== NFA_START_INVISIBLE_BEFORE_NEG_FIRST)) {
// Copy submatch info from the recursive call
copy_sub_off(&t->subs.norm, &pim->subs.norm);
if (rex.nfa_has_zsubexpr) {
copy_sub_off(&t->subs.synt, &pim->subs.synt);
}
} else {
// look-behind match failed, don't add the state
continue;
}
// Postponed invisible match was handled, don't add it to
// following states.
pim = NULL;
}
// If "pim" points into l->t it will become invalid when
// adding the state causes the list to be reallocated. Make a
// local copy to avoid that.
if (pim == &t->pim) {
copy_pim(&pim_copy, pim);
pim = &pim_copy;
}
if (add_here) {
r = addstate_here(thislist, add_state, &t->subs, pim, &listidx);
} else {
r = addstate(nextlist, add_state, &t->subs, pim, add_off);
if (add_count > 0) {
nextlist->t[nextlist->n - 1].count = add_count;
}
}
if (r == NULL) {
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
}
} // for (thislist = thislist; thislist->state; thislist++)
// Look for the start of a match in the current position by adding the
// start state to the list of states.
// The first found match is the leftmost one, thus the order of states
// matters!
// Do not add the start state in recursive calls of nfa_regmatch(),
// because recursive calls should only start in the first position.
// Unless "nfa_endp" is not NULL, then we match the end position.
// Also don't start a match past the first line.
if (!nfa_match
&& ((toplevel
&& rex.lnum == 0
&& clen != 0
&& (rex.reg_maxcol == 0
|| (colnr_T)(rex.input - rex.line) < rex.reg_maxcol))
|| (nfa_endp != NULL
&& (REG_MULTI
? (rex.lnum < nfa_endp->se_u.pos.lnum
|| (rex.lnum == nfa_endp->se_u.pos.lnum
&& (int)(rex.input - rex.line)
< nfa_endp->se_u.pos.col))
: rex.input < nfa_endp->se_u.ptr)))) {
#ifdef REGEXP_DEBUG
fprintf(log_fd, "(---) STARTSTATE\n");
#endif
// Inline optimized code for addstate() if we know the state is
// the first MOPEN.
if (toplevel) {
int add = true;
if (prog->regstart != NUL && clen != 0) {
if (nextlist->n == 0) {
colnr_T col = (colnr_T)(rex.input - rex.line) + clen;
// Nextlist is empty, we can skip ahead to the
// character that must appear at the start.
if (skip_to_start(prog->regstart, &col) == FAIL) {
break;
}
#ifdef REGEXP_DEBUG
fprintf(log_fd, " Skipping ahead %d bytes to regstart\n",
col - ((colnr_T)(rex.input - rex.line) + clen));
#endif
rex.input = rex.line + col - clen;
} else {
// Checking if the required start character matches is
// cheaper than adding a state that won't match.
const int c = utf_ptr2char((char *)rex.input + clen);
if (c != prog->regstart
&& (!rex.reg_ic
|| utf_fold(c) != utf_fold(prog->regstart))) {
#ifdef REGEXP_DEBUG
fprintf(log_fd,
" Skipping start state, regstart does not match\n");
#endif
add = false;
}
}
}
if (add) {
if (REG_MULTI) {
m->norm.list.multi[0].start_col =
(colnr_T)(rex.input - rex.line) + clen;
m->norm.orig_start_col =
m->norm.list.multi[0].start_col;
} else {
m->norm.list.line[0].start = rex.input + clen;
}
if (addstate(nextlist, start->out, m, NULL, clen) == NULL) {
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
}
} else {
if (addstate(nextlist, start, m, NULL, clen) == NULL) {
nfa_match = NFA_TOO_EXPENSIVE;
goto theend;
}
}
}
#ifdef REGEXP_DEBUG
fprintf(log_fd, ">>> Thislist had %d states available: ", thislist->n);
{
int i;
for (i = 0; i < thislist->n; i++) {
fprintf(log_fd, "%d ", abs(thislist->t[i].state->id));
}
}
fprintf(log_fd, "\n");
#endif
nextchar:
// Advance to the next character, or advance to the next line, or
// finish.
if (clen != 0) {
rex.input += clen;
} else if (go_to_nextline || (nfa_endp != NULL && REG_MULTI
&& rex.lnum < nfa_endp->se_u.pos.lnum)) {
reg_nextline();
} else {
break;
}
// Allow interrupting with CTRL-C.
reg_breakcheck();
if (got_int) {
break;
}
// Check for timeout once every twenty times to avoid overhead.
if (nfa_time_limit != NULL && ++nfa_time_count == 20) {
nfa_time_count = 0;
if (nfa_did_time_out()) {
break;
}
}
}
#ifdef REGEXP_DEBUG
if (log_fd != stderr) {
fclose(log_fd);
}
log_fd = NULL;
#endif
theend:
// Free memory
xfree(list[0].t);
xfree(list[1].t);
xfree(listids);
#undef ADD_STATE_IF_MATCH
#ifdef NFA_REGEXP_DEBUG_LOG
fclose(debug);
#endif
return nfa_match;
}
/// Try match of "prog" with at rex.line["col"].
///
/// @param tm timeout limit or NULL
/// @param timed_out flag set on timeout or NULL
///
/// @return <= 0 for failure, number of lines contained in the match otherwise.
static int nfa_regtry(nfa_regprog_T *prog, colnr_T col, proftime_T *tm, int *timed_out)
{
int i;
regsubs_T subs, m;
nfa_state_T *start = prog->start;
#ifdef REGEXP_DEBUG
FILE *f;
#endif
rex.input = rex.line + col;
nfa_time_limit = tm;
nfa_timed_out = timed_out;
nfa_time_count = 0;
#ifdef REGEXP_DEBUG
f = fopen(NFA_REGEXP_RUN_LOG, "a");
if (f != NULL) {
fprintf(f,
"\n\n\t=======================================================\n");
# ifdef REGEXP_DEBUG
fprintf(f, "\tRegexp is \"%s\"\n", nfa_regengine.expr);
# endif
fprintf(f, "\tInput text is \"%s\" \n", rex.input);
fprintf(f, "\t=======================================================\n\n");
nfa_print_state(f, start);
fprintf(f, "\n\n");
fclose(f);
} else {
emsg("Could not open temporary log file for writing");
}
#endif
clear_sub(&subs.norm);
clear_sub(&m.norm);
clear_sub(&subs.synt);
clear_sub(&m.synt);
int result = nfa_regmatch(prog, start, &subs, &m);
if (!result) {
return 0;
} else if (result == NFA_TOO_EXPENSIVE) {
return result;
}
cleanup_subexpr();
if (REG_MULTI) {
for (i = 0; i < subs.norm.in_use; i++) {
rex.reg_startpos[i].lnum = subs.norm.list.multi[i].start_lnum;
rex.reg_startpos[i].col = subs.norm.list.multi[i].start_col;
rex.reg_endpos[i].lnum = subs.norm.list.multi[i].end_lnum;
rex.reg_endpos[i].col = subs.norm.list.multi[i].end_col;
}
if (rex.reg_mmatch != NULL) {
rex.reg_mmatch->rmm_matchcol = subs.norm.orig_start_col;
}
if (rex.reg_startpos[0].lnum < 0) {
rex.reg_startpos[0].lnum = 0;
rex.reg_startpos[0].col = col;
}
if (rex.reg_endpos[0].lnum < 0) {
// pattern has a \ze but it didn't match, use current end
rex.reg_endpos[0].lnum = rex.lnum;
rex.reg_endpos[0].col = (int)(rex.input - rex.line);
} else {
// Use line number of "\ze".
rex.lnum = rex.reg_endpos[0].lnum;
}
} else {
for (i = 0; i < subs.norm.in_use; i++) {
rex.reg_startp[i] = subs.norm.list.line[i].start;
rex.reg_endp[i] = subs.norm.list.line[i].end;
}
if (rex.reg_startp[0] == NULL) {
rex.reg_startp[0] = rex.line + col;
}
if (rex.reg_endp[0] == NULL) {
rex.reg_endp[0] = rex.input;
}
}
// Package any found \z(...\) matches for export. Default is none.
unref_extmatch(re_extmatch_out);
re_extmatch_out = NULL;
if (prog->reghasz == REX_SET) {
cleanup_zsubexpr();
re_extmatch_out = make_extmatch();
// Loop over \z1, \z2, etc. There is no \z0.
for (i = 1; i < subs.synt.in_use; i++) {
if (REG_MULTI) {
struct multipos *mpos = &subs.synt.list.multi[i];
// Only accept single line matches that are valid.
if (mpos->start_lnum >= 0
&& mpos->start_lnum == mpos->end_lnum
&& mpos->end_col >= mpos->start_col) {
re_extmatch_out->matches[i] =
(uint8_t *)xstrnsave(reg_getline(mpos->start_lnum) + mpos->start_col,
(size_t)(mpos->end_col - mpos->start_col));
}
} else {
struct linepos *lpos = &subs.synt.list.line[i];
if (lpos->start != NULL && lpos->end != NULL) {
re_extmatch_out->matches[i] =
(uint8_t *)xstrnsave((char *)lpos->start, (size_t)(lpos->end - lpos->start));
}
}
}
}
return 1 + rex.lnum;
}
/// Match a regexp against a string ("line" points to the string) or multiple
/// lines (if "line" is NULL, use reg_getline()).
///
/// @param line String in which to search or NULL
/// @param startcol Column to start looking for match
/// @param tm Timeout limit or NULL
/// @param timed_out Flag set on timeout or NULL
///
/// @return <= 0 if there is no match and number of lines contained in the
/// match otherwise.
static int nfa_regexec_both(uint8_t *line, colnr_T startcol, proftime_T *tm, int *timed_out)
{
nfa_regprog_T *prog;
int retval = 0;
colnr_T col = startcol;
if (REG_MULTI) {
prog = (nfa_regprog_T *)rex.reg_mmatch->regprog;
line = (uint8_t *)reg_getline(0); // relative to the cursor
rex.reg_startpos = rex.reg_mmatch->startpos;
rex.reg_endpos = rex.reg_mmatch->endpos;
} else {
prog = (nfa_regprog_T *)rex.reg_match->regprog;
rex.reg_startp = (uint8_t **)rex.reg_match->startp;
rex.reg_endp = (uint8_t **)rex.reg_match->endp;
}
// Be paranoid...
if (prog == NULL || line == NULL) {
iemsg(_(e_null));
goto theend;
}
// If pattern contains "\c" or "\C": overrule value of rex.reg_ic
if (prog->regflags & RF_ICASE) {
rex.reg_ic = true;
} else if (prog->regflags & RF_NOICASE) {
rex.reg_ic = false;
}
// If pattern contains "\Z" overrule value of rex.reg_icombine
if (prog->regflags & RF_ICOMBINE) {
rex.reg_icombine = true;
}
rex.line = line;
rex.lnum = 0; // relative to line
rex.nfa_has_zend = prog->has_zend;
rex.nfa_has_backref = prog->has_backref;
rex.nfa_nsubexpr = prog->nsubexp;
rex.nfa_listid = 1;
rex.nfa_alt_listid = 2;
#ifdef REGEXP_DEBUG
nfa_regengine.expr = prog->pattern;
#endif
if (prog->reganch && col > 0) {
return 0L;
}
rex.need_clear_subexpr = true;
// Clear the external match subpointers if necessary.
if (prog->reghasz == REX_SET) {
rex.nfa_has_zsubexpr = true;
rex.need_clear_zsubexpr = true;
} else {
rex.nfa_has_zsubexpr = false;
rex.need_clear_zsubexpr = false;
}
if (prog->regstart != NUL) {
// Skip ahead until a character we know the match must start with.
// When there is none there is no match.
if (skip_to_start(prog->regstart, &col) == FAIL) {
return 0L;
}
// If match_text is set it contains the full text that must match.
// Nothing else to try. Doesn't handle combining chars well.
if (prog->match_text != NULL && !rex.reg_icombine) {
retval = find_match_text(&col, prog->regstart, prog->match_text);
if (REG_MULTI) {
rex.reg_mmatch->rmm_matchcol = col;
} else {
rex.reg_match->rm_matchcol = col;
}
return retval;
}
}
// If the start column is past the maximum column: no need to try.
if (rex.reg_maxcol > 0 && col >= rex.reg_maxcol) {
goto theend;
}
// Set the "nstate" used by nfa_regcomp() to zero to trigger an error when
// it's accidentally used during execution.
nstate = 0;
for (int i = 0; i < prog->nstate; i++) {
prog->state[i].id = i;
prog->state[i].lastlist[0] = 0;
prog->state[i].lastlist[1] = 0;
}
retval = nfa_regtry(prog, col, tm, timed_out);
#ifdef REGEXP_DEBUG
nfa_regengine.expr = NULL;
#endif
theend:
if (retval > 0) {
// Make sure the end is never before the start. Can happen when \zs and
// \ze are used.
if (REG_MULTI) {
const lpos_T *const start = &rex.reg_mmatch->startpos[0];
const lpos_T *const end = &rex.reg_mmatch->endpos[0];
if (end->lnum < start->lnum
|| (end->lnum == start->lnum && end->col < start->col)) {
rex.reg_mmatch->endpos[0] = rex.reg_mmatch->startpos[0];
}
} else {
if (rex.reg_match->endp[0] < rex.reg_match->startp[0]) {
rex.reg_match->endp[0] = rex.reg_match->startp[0];
}
// startpos[0] may be set by "\zs", also return the column where
// the whole pattern matched.
rex.reg_match->rm_matchcol = col;
}
}
return retval;
}
// Compile a regular expression into internal code for the NFA matcher.
// Returns the program in allocated space. Returns NULL for an error.
static regprog_T *nfa_regcomp(uint8_t *expr, int re_flags)
{
nfa_regprog_T *prog = NULL;
int *postfix;
if (expr == NULL) {
return NULL;
}
#ifdef REGEXP_DEBUG
nfa_regengine.expr = expr;
#endif
nfa_re_flags = re_flags;
init_class_tab();
nfa_regcomp_start(expr, re_flags);
// Build postfix form of the regexp. Needed to build the NFA
// (and count its size).
postfix = re2post();
if (postfix == NULL) {
goto fail; // Cascaded (syntax?) error
}
// In order to build the NFA, we parse the input regexp twice:
// 1. first pass to count size (so we can allocate space)
// 2. second to emit code
#ifdef REGEXP_DEBUG
{
FILE *f = fopen(NFA_REGEXP_RUN_LOG, "a");
if (f != NULL) {
fprintf(f,
"\n*****************************\n\n\n\n\t"
"Compiling regexp \"%s\"... hold on !\n",
expr);
fclose(f);
}
}
#endif
// PASS 1
// Count number of NFA states in "nstate". Do not build the NFA.
post2nfa(postfix, post_ptr, true);
// allocate the regprog with space for the compiled regexp
size_t prog_size = offsetof(nfa_regprog_T, state) + sizeof(nfa_state_T) * (size_t)nstate;
prog = xmalloc(prog_size);
state_ptr = prog->state;
prog->re_in_use = false;
// PASS 2
// Build the NFA
prog->start = post2nfa(postfix, post_ptr, false);
if (prog->start == NULL) {
goto fail;
}
prog->regflags = regflags;
prog->engine = &nfa_regengine;
prog->nstate = nstate;
prog->has_zend = rex.nfa_has_zend;
prog->has_backref = rex.nfa_has_backref;
prog->nsubexp = regnpar;
nfa_postprocess(prog);
prog->reganch = nfa_get_reganch(prog->start, 0);
prog->regstart = nfa_get_regstart(prog->start, 0);
prog->match_text = nfa_get_match_text(prog->start);
#ifdef REGEXP_DEBUG
nfa_postfix_dump(expr, OK);
nfa_dump(prog);
#endif
// Remember whether this pattern has any \z specials in it.
prog->reghasz = re_has_z;
prog->pattern = xstrdup((char *)expr);
#ifdef REGEXP_DEBUG
nfa_regengine.expr = NULL;
#endif
out:
xfree(post_start);
post_start = post_ptr = post_end = NULL;
state_ptr = NULL;
return (regprog_T *)prog;
fail:
XFREE_CLEAR(prog);
#ifdef REGEXP_DEBUG
nfa_postfix_dump(expr, FAIL);
nfa_regengine.expr = NULL;
#endif
goto out;
}
// Free a compiled regexp program, returned by nfa_regcomp().
static void nfa_regfree(regprog_T *prog)
{
if (prog == NULL) {
return;
}
xfree(((nfa_regprog_T *)prog)->match_text);
xfree(((nfa_regprog_T *)prog)->pattern);
xfree(prog);
}
/// Match a regexp against a string.
/// "rmp->regprog" is a compiled regexp as returned by nfa_regcomp().
/// Uses curbuf for line count and 'iskeyword'.
/// If "line_lbr" is true, consider a "\n" in "line" to be a line break.
///
/// @param line string to match against
/// @param col column to start looking for match
///
/// @return <= 0 for failure, number of lines contained in the match otherwise.
static int nfa_regexec_nl(regmatch_T *rmp, uint8_t *line, colnr_T col, bool line_lbr)
{
rex.reg_match = rmp;
rex.reg_mmatch = NULL;
rex.reg_maxline = 0;
rex.reg_line_lbr = line_lbr;
rex.reg_buf = curbuf;
rex.reg_win = NULL;
rex.reg_ic = rmp->rm_ic;
rex.reg_icombine = false;
rex.reg_nobreak = rmp->regprog->re_flags & RE_NOBREAK;
rex.reg_maxcol = 0;
return nfa_regexec_both(line, col, NULL, NULL);
}
/// Matches a regexp against multiple lines.
/// "rmp->regprog" is a compiled regexp as returned by vim_regcomp().
/// Uses curbuf for line count and 'iskeyword'.
///
/// @param win Window in which to search or NULL
/// @param buf Buffer in which to search
/// @param lnum Number of line to start looking for match
/// @param col Column to start looking for match
/// @param tm Timeout limit or NULL
/// @param timed_out Flag set on timeout or NULL
///
/// @return <= 0 if there is no match and number of lines contained in the match
/// otherwise.
///
/// @note The body is the same as bt_regexec() except for nfa_regexec_both()
///
/// @warning
/// Match may actually be in another line. e.g.:
/// when r.e. is \nc, cursor is at 'a' and the text buffer looks like
///
/// @par
///
/// +-------------------------+
/// |a |
/// |b |
/// |c |
/// | |
/// +-------------------------+
///
/// @par
/// then nfa_regexec_multi() returns 3. while the original vim_regexec_multi()
/// returns 0 and a second call at line 2 will return 2.
///
/// @par
/// FIXME if this behavior is not compatible.
static int nfa_regexec_multi(regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col,
proftime_T *tm, int *timed_out)
{
init_regexec_multi(rmp, win, buf, lnum);
return nfa_regexec_both(NULL, col, tm, timed_out);
}
// }}}1
static regengine_T bt_regengine = {
bt_regcomp,
bt_regfree,
bt_regexec_nl,
bt_regexec_multi,
#ifdef REGEXP_DEBUG
"",
#endif
};
static regengine_T nfa_regengine = {
nfa_regcomp,
nfa_regfree,
nfa_regexec_nl,
nfa_regexec_multi,
#ifdef REGEXP_DEBUG
"",
#endif
};
// Which regexp engine to use? Needed for vim_regcomp().
// Must match with 'regexpengine'.
static int regexp_engine = 0;
#ifdef REGEXP_DEBUG
static uint8_t regname[][30] = {
"AUTOMATIC Regexp Engine",
"BACKTRACKING Regexp Engine",
"NFA Regexp Engine"
};
#endif
// Compile a regular expression into internal code.
// Returns the program in allocated memory.
// Use vim_regfree() to free the memory.
// Returns NULL for an error.
regprog_T *vim_regcomp(const char *expr_arg, int re_flags)
{
regprog_T *prog = NULL;
const char *expr = expr_arg;
regexp_engine = (int)p_re;
// Check for prefix "\%#=", that sets the regexp engine
if (strncmp(expr, "\\%#=", 4) == 0) {
int newengine = expr[4] - '0';
if (newengine == AUTOMATIC_ENGINE
|| newengine == BACKTRACKING_ENGINE
|| newengine == NFA_ENGINE) {
regexp_engine = expr[4] - '0';
expr += 5;
#ifdef REGEXP_DEBUG
smsg(0, "New regexp mode selected (%d): %s",
regexp_engine,
regname[newengine]);
#endif
} else {
emsg(_("E864: \\%#= can only be followed by 0, 1, or 2. The automatic engine will be used "));
regexp_engine = AUTOMATIC_ENGINE;
}
}
#ifdef REGEXP_DEBUG
bt_regengine.expr = expr;
nfa_regengine.expr = expr;
#endif
// reg_iswordc() uses rex.reg_buf
rex.reg_buf = curbuf;
//
// First try the NFA engine, unless backtracking was requested.
//
const int called_emsg_before = called_emsg;
if (regexp_engine != BACKTRACKING_ENGINE) {
prog = nfa_regengine.regcomp((uint8_t *)expr,
re_flags + (regexp_engine == AUTOMATIC_ENGINE ? RE_AUTO : 0));
} else {
prog = bt_regengine.regcomp((uint8_t *)expr, re_flags);
}
// Check for error compiling regexp with initial engine.
if (prog == NULL) {
#ifdef BT_REGEXP_DEBUG_LOG
// Debugging log for BT engine.
if (regexp_engine != BACKTRACKING_ENGINE) {
FILE *f = fopen(BT_REGEXP_DEBUG_LOG_NAME, "a");
if (f) {
fprintf(f, "Syntax error in \"%s\"\n", expr);
fclose(f);
} else {
semsg("(NFA) Could not open \"%s\" to write !!!",
BT_REGEXP_DEBUG_LOG_NAME);
}
}
#endif
// If the NFA engine failed, try the backtracking engine. The NFA engine
// also fails for patterns that it can't handle well but are still valid
// patterns, thus a retry should work.
// But don't try if an error message was given.
if (regexp_engine == AUTOMATIC_ENGINE && called_emsg == called_emsg_before) {
regexp_engine = BACKTRACKING_ENGINE;
report_re_switch(expr);
prog = bt_regengine.regcomp((uint8_t *)expr, re_flags);
}
}
if (prog != NULL) {
// Store the info needed to call regcomp() again when the engine turns out
// to be very slow when executing it.
prog->re_engine = (unsigned)regexp_engine;
prog->re_flags = (unsigned)re_flags;
}
return prog;
}
// Free a compiled regexp program, returned by vim_regcomp().
void vim_regfree(regprog_T *prog)
{
if (prog != NULL) {
prog->engine->regfree(prog);
}
}
#if defined(EXITFREE)
void free_regexp_stuff(void)
{
ga_clear(&regstack);
ga_clear(&backpos);
xfree(reg_tofree);
xfree(reg_prev_sub);
}
#endif
static void report_re_switch(const char *pat)
{
if (p_verbose > 0) {
verbose_enter();
msg_puts(_("Switching to backtracking RE engine for pattern: "));
msg_puts(pat);
verbose_leave();
}
}
/// Match a regexp against a string.
/// "rmp->regprog" must be a compiled regexp as returned by vim_regcomp().
/// Note: "rmp->regprog" may be freed and changed.
/// Uses curbuf for line count and 'iskeyword'.
/// When "nl" is true consider a "\n" in "line" to be a line break.
///
/// @param rmp
/// @param line the string to match against
/// @param col the column to start looking for match
/// @param nl
///
/// @return true if there is a match, false if not.
static bool vim_regexec_string(regmatch_T *rmp, const char *line, colnr_T col, bool nl)
{
regexec_T rex_save;
bool rex_in_use_save = rex_in_use;
// Cannot use the same prog recursively, it contains state.
if (rmp->regprog->re_in_use) {
emsg(_(e_recursive));
return false;
}
rmp->regprog->re_in_use = true;
if (rex_in_use) {
// Being called recursively, save the state.
rex_save = rex;
}
rex_in_use = true;
rex.reg_startp = NULL;
rex.reg_endp = NULL;
rex.reg_startpos = NULL;
rex.reg_endpos = NULL;
int result = rmp->regprog->engine->regexec_nl(rmp, (uint8_t *)line, col, nl);
rmp->regprog->re_in_use = false;
// NFA engine aborted because it's very slow, use backtracking engine instead.
if (rmp->regprog->re_engine == AUTOMATIC_ENGINE
&& result == NFA_TOO_EXPENSIVE) {
int save_p_re = (int)p_re;
int re_flags = (int)rmp->regprog->re_flags;
char *pat = xstrdup(((nfa_regprog_T *)rmp->regprog)->pattern);
p_re = BACKTRACKING_ENGINE;
vim_regfree(rmp->regprog);
report_re_switch(pat);
rmp->regprog = vim_regcomp(pat, re_flags);
if (rmp->regprog != NULL) {
rmp->regprog->re_in_use = true;
result = rmp->regprog->engine->regexec_nl(rmp, (uint8_t *)line, col, nl);
rmp->regprog->re_in_use = false;
}
xfree(pat);
p_re = save_p_re;
}
rex_in_use = rex_in_use_save;
if (rex_in_use) {
rex = rex_save;
}
return result > 0;
}
// Note: "*prog" may be freed and changed.
// Return true if there is a match, false if not.
bool vim_regexec_prog(regprog_T **prog, bool ignore_case, const char *line, colnr_T col)
{
regmatch_T regmatch = { .regprog = *prog, .rm_ic = ignore_case };
bool r = vim_regexec_string(&regmatch, line, col, false);
*prog = regmatch.regprog;
return r;
}
// Note: "rmp->regprog" may be freed and changed.
// Return true if there is a match, false if not.
bool vim_regexec(regmatch_T *rmp, const char *line, colnr_T col)
{
return vim_regexec_string(rmp, line, col, false);
}
// Like vim_regexec(), but consider a "\n" in "line" to be a line break.
// Note: "rmp->regprog" may be freed and changed.
// Return true if there is a match, false if not.
bool vim_regexec_nl(regmatch_T *rmp, const char *line, colnr_T col)
{
return vim_regexec_string(rmp, line, col, true);
}
/// Match a regexp against multiple lines.
/// "rmp->regprog" must be a compiled regexp as returned by vim_regcomp().
/// Note: "rmp->regprog" may be freed and changed, even set to NULL.
/// Uses curbuf for line count and 'iskeyword'.
///
/// @param win window in which to search or NULL
/// @param buf buffer in which to search
/// @param lnum nr of line to start looking for match
/// @param col column to start looking for match
/// @param tm timeout limit or NULL
/// @param timed_out flag is set when timeout limit reached
///
/// @return zero if there is no match. Return number of lines contained in the
/// match otherwise.
int vim_regexec_multi(regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col,
proftime_T *tm, int *timed_out)
FUNC_ATTR_NONNULL_ARG(1)
{
regexec_T rex_save;
bool rex_in_use_save = rex_in_use;
// Cannot use the same prog recursively, it contains state.
if (rmp->regprog->re_in_use) {
emsg(_(e_recursive));
return false;
}
rmp->regprog->re_in_use = true;
if (rex_in_use) {
// Being called recursively, save the state.
rex_save = rex;
}
rex_in_use = true;
int result = rmp->regprog->engine->regexec_multi(rmp, win, buf, lnum, col, tm, timed_out);
rmp->regprog->re_in_use = false;
// NFA engine aborted because it's very slow, use backtracking engine instead.
if (rmp->regprog->re_engine == AUTOMATIC_ENGINE
&& result == NFA_TOO_EXPENSIVE) {
int save_p_re = (int)p_re;
int re_flags = (int)rmp->regprog->re_flags;
char *pat = xstrdup(((nfa_regprog_T *)rmp->regprog)->pattern);
p_re = BACKTRACKING_ENGINE;
regprog_T *prev_prog = rmp->regprog;
report_re_switch(pat);
// checking for \z misuse was already done when compiling for NFA,
// allow all here
reg_do_extmatch = REX_ALL;
rmp->regprog = vim_regcomp(pat, re_flags);
reg_do_extmatch = 0;
if (rmp->regprog == NULL) {
// Somehow compiling the pattern failed now, put back the
// previous one to avoid "regprog" becoming NULL.
rmp->regprog = prev_prog;
} else {
vim_regfree(prev_prog);
rmp->regprog->re_in_use = true;
result = rmp->regprog->engine->regexec_multi(rmp, win, buf, lnum, col, tm, timed_out);
rmp->regprog->re_in_use = false;
}
xfree(pat);
p_re = save_p_re;
}
rex_in_use = rex_in_use_save;
if (rex_in_use) {
rex = rex_save;
}
return result <= 0 ? 0 : result;
}
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