Mercurial > vim
annotate src/regexp.h @ 19712:714875349336
Added tag v8.2.0412 for changeset 831a3f3be6f4330efd5ab2846ee6627fe3daa5b4
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Thu, 19 Mar 2020 17:15:04 +0100 |
| parents | 6e3dc2d630c2 |
| children | 89c181c99e23 |
| rev | line source |
|---|---|
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commit https://github.com/vim/vim/commit/edf3f97ae2af024708ebb4ac614227327033ca47
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
| 7 | 2 * |
| 3 * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE | |
| 4 * | |
| 5 * This is NOT the original regular expression code as written by Henry | |
| 6 * Spencer. This code has been modified specifically for use with Vim, and | |
| 7 * should not be used apart from compiling Vim. If you want a good regular | |
| 8 * expression library, get the original code. | |
| 9 * | |
| 10 * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE | |
| 11 */ | |
| 12 | |
| 13 #ifndef _REGEXP_H | |
| 14 #define _REGEXP_H | |
| 15 | |
| 16 /* | |
| 17 * The number of sub-matches is limited to 10. | |
| 18 * The first one (index 0) is the whole match, referenced with "\0". | |
| 19 * The second one (index 1) is the first sub-match, referenced with "\1". | |
| 20 * This goes up to the tenth (index 9), referenced with "\9". | |
| 21 */ | |
| 22 #define NSUBEXP 10 | |
| 23 | |
| 24 /* | |
| 4444 | 25 * In the NFA engine: how many braces are allowed. |
| 26 * TODO(RE): Use dynamic memory allocation instead of static, like here | |
| 27 */ | |
| 28 #define NFA_MAX_BRACES 20 | |
| 29 | |
| 6328 | 30 /* |
| 31 * In the NFA engine: how many states are allowed | |
| 32 */ | |
| 33 #define NFA_MAX_STATES 100000 | |
| 34 #define NFA_TOO_EXPENSIVE -1 | |
| 35 | |
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36 // Which regexp engine to use? Needed for vim_regcomp(). |
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37 // Must match with 'regexpengine'. |
| 6328 | 38 #define AUTOMATIC_ENGINE 0 |
| 39 #define BACKTRACKING_ENGINE 1 | |
| 40 #define NFA_ENGINE 2 | |
| 41 | |
| 4444 | 42 typedef struct regengine regengine_T; |
| 43 | |
| 44 /* | |
| 7 | 45 * Structure returned by vim_regcomp() to pass on to vim_regexec(). |
| 4444 | 46 * This is the general structure. For the actual matcher, two specific |
| 47 * structures are used. See code below. | |
| 48 */ | |
| 49 typedef struct regprog | |
| 50 { | |
| 51 regengine_T *engine; | |
| 52 unsigned regflags; | |
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patch 8.1.0192: executing regexp recursively fails with a crash
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53 unsigned re_engine; // automatic, backtracking or nfa engine |
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54 unsigned re_flags; // second argument for vim_regcomp() |
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55 int re_in_use; // prog is being executed |
| 4444 | 56 } regprog_T; |
| 57 | |
| 58 /* | |
| 59 * Structure used by the back track matcher. | |
| 7 | 60 * These fields are only to be used in regexp.c! |
| 4444 | 61 * See regexp.c for an explanation. |
| 7 | 62 */ |
| 63 typedef struct | |
| 64 { | |
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65 // These four members implement regprog_T |
| 4444 | 66 regengine_T *engine; |
| 67 unsigned regflags; | |
| 6328 | 68 unsigned re_engine; |
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69 unsigned re_flags; |
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70 int re_in_use; |
| 4444 | 71 |
| 7 | 72 int regstart; |
| 73 char_u reganch; | |
| 74 char_u *regmust; | |
| 75 int regmlen; | |
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76 #ifdef FEAT_SYN_HL |
| 4444 | 77 char_u reghasz; |
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78 #endif |
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79 char_u program[1]; // actually longer.. |
| 4444 | 80 } bt_regprog_T; |
| 81 | |
| 82 /* | |
| 83 * Structure representing a NFA state. | |
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84 * An NFA state may have no outgoing edge, when it is a NFA_MATCH state. |
| 4444 | 85 */ |
| 86 typedef struct nfa_state nfa_state_T; | |
| 87 struct nfa_state | |
| 88 { | |
| 89 int c; | |
| 90 nfa_state_T *out; | |
| 91 nfa_state_T *out1; | |
| 92 int id; | |
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93 int lastlist[2]; // 0: normal, 1: recursive |
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94 int val; |
| 4444 | 95 }; |
| 96 | |
| 97 /* | |
| 98 * Structure used by the NFA matcher. | |
| 99 */ | |
| 100 typedef struct | |
| 101 { | |
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102 // These three members implement regprog_T |
| 4444 | 103 regengine_T *engine; |
| 7 | 104 unsigned regflags; |
| 6328 | 105 unsigned re_engine; |
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106 unsigned re_flags; |
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107 int re_in_use; |
| 4444 | 108 |
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109 nfa_state_T *start; // points into state[] |
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110 |
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111 int reganch; // pattern starts with ^ |
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112 int regstart; // char at start of pattern |
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113 char_u *match_text; // plain text to match with |
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114 |
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115 int has_zend; // pattern contains \ze |
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116 int has_backref; // pattern contains \1 .. \9 |
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117 #ifdef FEAT_SYN_HL |
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118 int reghasz; |
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119 #endif |
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120 char_u *pattern; |
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121 int nsubexp; // number of () |
| 4444 | 122 int nstate; |
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123 nfa_state_T state[1]; // actually longer.. |
| 4444 | 124 } nfa_regprog_T; |
| 7 | 125 |
| 126 /* | |
| 127 * Structure to be used for single-line matching. | |
| 128 * Sub-match "no" starts at "startp[no]" and ends just before "endp[no]". | |
| 129 * When there is no match, the pointer is NULL. | |
| 130 */ | |
| 131 typedef struct | |
| 132 { | |
| 133 regprog_T *regprog; | |
| 134 char_u *startp[NSUBEXP]; | |
| 135 char_u *endp[NSUBEXP]; | |
| 136 int rm_ic; | |
| 137 } regmatch_T; | |
| 138 | |
| 139 /* | |
| 140 * Structure to be used for multi-line matching. | |
| 141 * Sub-match "no" starts in line "startpos[no].lnum" column "startpos[no].col" | |
| 142 * and ends in line "endpos[no].lnum" just before column "endpos[no].col". | |
| 143 * The line numbers are relative to the first line, thus startpos[0].lnum is | |
| 144 * always 0. | |
| 145 * When there is no match, the line number is -1. | |
| 146 */ | |
| 147 typedef struct | |
| 148 { | |
| 149 regprog_T *regprog; | |
| 150 lpos_T startpos[NSUBEXP]; | |
| 151 lpos_T endpos[NSUBEXP]; | |
| 152 int rmm_ic; | |
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153 colnr_T rmm_maxcol; // when not zero: maximum column |
| 7 | 154 } regmmatch_T; |
| 155 | |
| 156 /* | |
| 157 * Structure used to store external references: "\z\(\)" to "\z\1". | |
| 158 * Use a reference count to avoid the need to copy this around. When it goes | |
| 159 * from 1 to zero the matches need to be freed. | |
| 160 */ | |
| 161 typedef struct | |
| 162 { | |
| 163 short refcnt; | |
| 164 char_u *matches[NSUBEXP]; | |
| 165 } reg_extmatch_T; | |
| 166 | |
| 4444 | 167 struct regengine |
| 168 { | |
| 169 regprog_T *(*regcomp)(char_u*, int); | |
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170 void (*regfree)(regprog_T *); |
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171 int (*regexec_nl)(regmatch_T *, char_u *, colnr_T, int); |
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172 long (*regexec_multi)(regmmatch_T *, win_T *, buf_T *, linenr_T, colnr_T, proftime_T *, int *); |
| 4444 | 173 char_u *expr; |
| 174 }; | |
| 175 | |
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176 #endif // _REGEXP_H |