annotate src/regexp.h @ 6874:a89cff862dda v7.4.757

patch 7.4.757 Problem: Cannot detect the background color of a terminal. Solution: Add T_RBG to request the background color if possible. (Lubomir Rintel)
author Bram Moolenaar <bram@vim.org>
date Thu, 25 Jun 2015 17:03:36 +0200
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children 4aead6a9b7a9
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1 /* vi:set ts=8 sts=4 sw=4:
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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 } regprog_T;
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56
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57 /*
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58 * Structure used by the back track matcher.
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59 * These fields are only to be used in regexp.c!
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60 * See regexp.c for an explanation.
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61 */
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62 typedef struct
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63 {
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64 /* These four members implement regprog_T */
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65 regengine_T *engine;
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66 unsigned regflags;
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67 unsigned re_engine;
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68 unsigned re_flags; /* second argument for vim_regcomp() */
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69
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70 int regstart;
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71 char_u reganch;
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72 char_u *regmust;
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73 int regmlen;
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74 #ifdef FEAT_SYN_HL
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75 char_u reghasz;
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76 #endif
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77 char_u program[1]; /* actually longer.. */
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78 } bt_regprog_T;
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79
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80 /*
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81 * Structure representing a NFA state.
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82 * A NFA state may have no outgoing edge, when it is a NFA_MATCH state.
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83 */
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84 typedef struct nfa_state nfa_state_T;
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85 struct nfa_state
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86 {
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87 int c;
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88 nfa_state_T *out;
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89 nfa_state_T *out1;
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90 int id;
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91 int lastlist[2]; /* 0: normal, 1: recursive */
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92 int val;
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93 };
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94
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95 /*
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96 * Structure used by the NFA matcher.
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97 */
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98 typedef struct
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99 {
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100 /* These three members implement regprog_T */
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101 regengine_T *engine;
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102 unsigned regflags;
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103 unsigned re_engine;
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104 unsigned re_flags; /* second argument for vim_regcomp() */
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105
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106 nfa_state_T *start; /* points into state[] */
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107
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108 int reganch; /* pattern starts with ^ */
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109 int regstart; /* char at start of pattern */
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110 char_u *match_text; /* plain text to match with */
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111
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112 int has_zend; /* pattern contains \ze */
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113 int has_backref; /* pattern contains \1 .. \9 */
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114 #ifdef FEAT_SYN_HL
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115 int reghasz;
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116 #endif
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117 char_u *pattern;
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118 int nsubexp; /* number of () */
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119 int nstate;
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120 nfa_state_T state[1]; /* actually longer.. */
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121 } nfa_regprog_T;
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122
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123 /*
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124 * Structure to be used for single-line matching.
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125 * Sub-match "no" starts at "startp[no]" and ends just before "endp[no]".
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126 * When there is no match, the pointer is NULL.
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127 */
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128 typedef struct
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129 {
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130 regprog_T *regprog;
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131 char_u *startp[NSUBEXP];
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132 char_u *endp[NSUBEXP];
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133 int rm_ic;
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134 } regmatch_T;
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135
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136 /*
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137 * Structure to be used for multi-line matching.
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138 * Sub-match "no" starts in line "startpos[no].lnum" column "startpos[no].col"
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139 * and ends in line "endpos[no].lnum" just before column "endpos[no].col".
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140 * The line numbers are relative to the first line, thus startpos[0].lnum is
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141 * always 0.
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142 * When there is no match, the line number is -1.
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143 */
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144 typedef struct
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145 {
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146 regprog_T *regprog;
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147 lpos_T startpos[NSUBEXP];
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148 lpos_T endpos[NSUBEXP];
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149 int rmm_ic;
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150 colnr_T rmm_maxcol; /* when not zero: maximum column */
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151 } regmmatch_T;
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152
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153 /*
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154 * Structure used to store external references: "\z\(\)" to "\z\1".
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155 * Use a reference count to avoid the need to copy this around. When it goes
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156 * from 1 to zero the matches need to be freed.
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157 */
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158 typedef struct
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159 {
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160 short refcnt;
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161 char_u *matches[NSUBEXP];
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162 } reg_extmatch_T;
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163
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164 struct regengine
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165 {
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166 regprog_T *(*regcomp)(char_u*, int);
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167 void (*regfree)(regprog_T *);
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168 int (*regexec_nl)(regmatch_T*, char_u*, colnr_T, int);
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169 long (*regexec_multi)(regmmatch_T*, win_T*, buf_T*, linenr_T, colnr_T, proftime_T*);
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170 char_u *expr;
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171 };
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172
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173 #endif /* _REGEXP_H */