annotate src/regexp.h @ 18673:f1658662ea84 v8.1.2328

patch 8.1.2328: a few hangul input pieces remain Commit: https://github.com/vim/vim/commit/bd3bc0314e27cac061575930144ce5fadc26c22e Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 21 17:34:51 2019 +0100 patch 8.1.2328: a few hangul input pieces remain Problem: A few hangul input pieces remain. Solution: Update VMS makefile.
author Bram Moolenaar <Bram@vim.org>
date Thu, 21 Nov 2019 17:45:04 +0100
parents 3d6b282e2d6e
children 6e3dc2d630c2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* vi:set ts=8 sts=4 sw=4 noet:
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2 *
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3 * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
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4 *
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5 * This is NOT the original regular expression code as written by Henry
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6 * Spencer. This code has been modified specifically for use with Vim, and
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7 * should not be used apart from compiling Vim. If you want a good regular
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8 * expression library, get the original code.
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9 *
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10 * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
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11 */
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12
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13 #ifndef _REGEXP_H
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14 #define _REGEXP_H
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15
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16 /*
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17 * The number of sub-matches is limited to 10.
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18 * The first one (index 0) is the whole match, referenced with "\0".
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19 * The second one (index 1) is the first sub-match, referenced with "\1".
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20 * This goes up to the tenth (index 9), referenced with "\9".
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21 */
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22 #define NSUBEXP 10
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23
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24 /*
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25 * In the NFA engine: how many braces are allowed.
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26 * TODO(RE): Use dynamic memory allocation instead of static, like here
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27 */
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28 #define NFA_MAX_BRACES 20
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29
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30 /*
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31 * In the NFA engine: how many states are allowed
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32 */
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33 #define NFA_MAX_STATES 100000
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34 #define NFA_TOO_EXPENSIVE -1
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35
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36 /* Which regexp engine to use? Needed for vim_regcomp().
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37 * Must match with 'regexpengine'. */
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38 #define AUTOMATIC_ENGINE 0
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39 #define BACKTRACKING_ENGINE 1
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40 #define NFA_ENGINE 2
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41
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42 typedef struct regengine regengine_T;
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43
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44 /*
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45 * Structure returned by vim_regcomp() to pass on to vim_regexec().
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46 * This is the general structure. For the actual matcher, two specific
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47 * structures are used. See code below.
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48 */
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49 typedef struct regprog
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50 {
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51 regengine_T *engine;
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52 unsigned regflags;
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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
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56 } regprog_T;
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57
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58 /*
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59 * Structure used by the back track matcher.
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60 * These fields are only to be used in regexp.c!
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61 * See regexp.c for an explanation.
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62 */
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63 typedef struct
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64 {
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65 /* These four members implement regprog_T */
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66 regengine_T *engine;
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67 unsigned regflags;
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68 unsigned re_engine;
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69 unsigned re_flags;
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70 int re_in_use;
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71
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72 int regstart;
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73 char_u reganch;
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74 char_u *regmust;
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75 int regmlen;
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76 #ifdef FEAT_SYN_HL
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77 char_u reghasz;
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78 #endif
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79 char_u program[1]; /* actually longer.. */
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80 } bt_regprog_T;
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81
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82 /*
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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.
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85 */
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86 typedef struct nfa_state nfa_state_T;
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87 struct nfa_state
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88 {
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89 int c;
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90 nfa_state_T *out;
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91 nfa_state_T *out1;
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92 int id;
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93 int lastlist[2]; /* 0: normal, 1: recursive */
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94 int val;
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95 };
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96
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97 /*
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98 * Structure used by the NFA matcher.
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99 */
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100 typedef struct
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101 {
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102 /* These three members implement regprog_T */
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103 regengine_T *engine;
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104 unsigned regflags;
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105 unsigned re_engine;
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106 unsigned re_flags;
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107 int re_in_use;
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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 () */
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122 int nstate;
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123 nfa_state_T state[1]; /* actually longer.. */
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124 } nfa_regprog_T;
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125
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126 /*
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127 * Structure to be used for single-line matching.
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128 * Sub-match "no" starts at "startp[no]" and ends just before "endp[no]".
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129 * When there is no match, the pointer is NULL.
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130 */
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131 typedef struct
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132 {
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133 regprog_T *regprog;
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134 char_u *startp[NSUBEXP];
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135 char_u *endp[NSUBEXP];
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136 int rm_ic;
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137 } regmatch_T;
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138
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139 /*
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140 * Structure to be used for multi-line matching.
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141 * Sub-match "no" starts in line "startpos[no].lnum" column "startpos[no].col"
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142 * and ends in line "endpos[no].lnum" just before column "endpos[no].col".
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143 * The line numbers are relative to the first line, thus startpos[0].lnum is
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144 * always 0.
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145 * When there is no match, the line number is -1.
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146 */
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147 typedef struct
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148 {
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149 regprog_T *regprog;
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150 lpos_T startpos[NSUBEXP];
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151 lpos_T endpos[NSUBEXP];
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152 int rmm_ic;
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153 colnr_T rmm_maxcol; /* when not zero: maximum column */
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154 } regmmatch_T;
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155
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156 /*
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157 * Structure used to store external references: "\z\(\)" to "\z\1".
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158 * Use a reference count to avoid the need to copy this around. When it goes
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159 * from 1 to zero the matches need to be freed.
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160 */
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161 typedef struct
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162 {
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163 short refcnt;
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164 char_u *matches[NSUBEXP];
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165 } reg_extmatch_T;
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166
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167 struct regengine
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168 {
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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 *);
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173 char_u *expr;
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174 };
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175
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176 #endif /* _REGEXP_H */