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428
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1 /* Definitions for data structures and routines for the regular
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2 expression library, version 0.12.
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3
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4 Copyright (C) 1985, 89, 90, 91, 92, 93, 95 Free Software Foundation, Inc.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.29. */
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22
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440
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23 #ifndef INCLUDED_regex_h_
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24 #define INCLUDED_regex_h_
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428
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25
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446
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26 #ifdef emacs
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27 #define RE_TRANSLATE_TYPE Lisp_Object
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28 #else
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29 #define RE_TRANSLATE_TYPE char *
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30 #endif /* emacs */
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31
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428
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32 /* POSIX says that <sys/types.h> must be included (by the caller) before
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33 <regex.h>. */
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34
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35
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36 /* The following bits are used to determine the regexp syntax we
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37 recognize. The not-set meaning typically corresponds to the syntax
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38 used by Emacs (the exception is RE_INTERVAL, made for historical
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39 reasons). The bits are given in alphabetical order, and the
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40 definitions shifted by one from the previous bit; thus, when we add or
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41 remove a bit, only one other definition need change. */
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42 typedef unsigned reg_syntax_t;
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43
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44 /* If this bit is not set, then \ inside a bracket expression is literal.
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45 If set, then such a \ quotes the following character. */
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46 #define RE_BACKSLASH_ESCAPE_IN_LISTS (1)
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47
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48 /* If this bit is not set, then + and ? are operators, and \+ and \? are
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49 literals.
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50 If set, then \+ and \? are operators and + and ? are literals. */
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51 #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
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52
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53 /* If this bit is set, then character classes are supported. They are:
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54 [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:],
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55 [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
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56 If not set, then character classes are not supported. */
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57 #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
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58
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59 /* If this bit is set, then ^ and $ are always anchors (outside bracket
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60 expressions, of course).
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61 If this bit is not set, then it depends:
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62 ^ is an anchor if it is at the beginning of a regular
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63 expression or after an open-group or an alternation operator;
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64 $ is an anchor if it is at the end of a regular expression, or
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65 before a close-group or an alternation operator.
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66
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67 This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
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68 POSIX draft 11.2 says that * etc. in leading positions is undefined.
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69 We already implemented a previous draft which made those constructs
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70 invalid, though, so we haven't changed the code back. */
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71 #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
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72
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73 /* If this bit is set, then special characters are always special
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74 regardless of where they are in the pattern.
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75 If this bit is not set, then special characters are special only in
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76 some contexts; otherwise they are ordinary. Specifically,
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77 * + ? and intervals are only special when not after the beginning,
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78 open-group, or alternation operator. */
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79 #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
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80
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81 /* If this bit is set, then *, +, ?, and { cannot be first in an re or
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82 immediately after an alternation or begin-group operator. */
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83 #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
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84
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85 /* If this bit is set, then . matches newline.
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86 If not set, then it doesn't. */
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87 #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
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88
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89 /* If this bit is set, then . doesn't match NUL.
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90 If not set, then it does. */
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91 #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
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92
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93 /* If this bit is set, nonmatching lists [^...] do not match newline.
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94 If not set, they do. */
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95 #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
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96
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97 /* If this bit is set, either \{...\} or {...} defines an
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98 interval, depending on RE_NO_BK_BRACES.
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99 If not set, \{, \}, {, and } are literals. */
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100 #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
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101
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102 /* If this bit is set, +, ? and | aren't recognized as operators.
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103 If not set, they are. */
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104 #define RE_LIMITED_OPS (RE_INTERVALS << 1)
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105
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106 /* If this bit is set, newline is an alternation operator.
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107 If not set, newline is literal. */
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108 #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
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109
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110 /* If this bit is set, then `{...}' defines an interval, and \{ and \}
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111 are literals.
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112 If not set, then `\{...\}' defines an interval. */
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113 #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
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114
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115 /* If this bit is set, (...) defines a group, and \( and \) are literals.
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116 If not set, \(...\) defines a group, and ( and ) are literals. */
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117 #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
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118
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119 /* If this bit is set, then \<digit> matches <digit>.
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120 If not set, then \<digit> is a back-reference. */
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121 #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
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122
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123 /* If this bit is set, then | is an alternation operator, and \| is literal.
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124 If not set, then \| is an alternation operator, and | is literal. */
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125 #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
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126
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127 /* If this bit is set, then an ending range point collating higher
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128 than the starting range point, as in [z-a], is invalid.
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129 If not set, then when ending range point collates higher than the
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130 starting range point, the range is ignored. */
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131 #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
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132
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133 /* If this bit is not set, allow minimal matching:
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134 - a*? and a+? and a?? perform shortest-possible matching (compare with a*
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135 and a+ and a?, respectively, which perform longest-possible matching)
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136 - other juxtaposing of * + and ? is rejected.
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137 If this bit is set, consecutive * + and ?'s are collapsed in a logical
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138 manner:
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139 - a*? and a+? are the same as a*
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140 - a?? is the same as a?
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141 */
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142 #define RE_NO_MINIMAL_MATCHING (RE_NO_EMPTY_RANGES << 1)
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143
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144 /* If this bit is set, succeed as soon as we match the whole pattern,
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145 without further backtracking. */
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146 #define RE_NO_POSIX_BACKTRACKING (RE_NO_MINIMAL_MATCHING << 1)
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147
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148 /* If this bit is not set, (?:re) behaves like (re) (or \(?:re\) behaves like
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149 \(re\)) except that the matched string is not registered. */
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150 #define RE_NO_SHY_GROUPS (RE_NO_POSIX_BACKTRACKING << 1)
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151
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152 /* If this bit is set, then an unmatched ) is ordinary.
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153 If not set, then an unmatched ) is invalid. */
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154 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_SHY_GROUPS << 1)
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155
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502
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156 /* If this bit is set, then \22 will read as a back reference,
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157 provided at least 22 non-shy groups have been seen so far. In all
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158 other cases (bit not set, not 22 non-shy groups seen so far), it
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159 reads as a back reference \2 followed by a digit 2. */
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160 #define RE_NO_MULTI_DIGIT_BK_REFS (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
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161
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428
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162 /* This global variable defines the particular regexp syntax to use (for
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163 some interfaces). When a regexp is compiled, the syntax used is
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164 stored in the pattern buffer, so changing this does not affect
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165 already-compiled regexps. */
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166 extern reg_syntax_t re_syntax_options;
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167
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168 /* Define combinations of the above bits for the standard possibilities.
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169 (The [[[ comments delimit what gets put into the Texinfo file, so
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170 don't delete them!) */
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171 /* [[[begin syntaxes]]] */
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172 #define RE_SYNTAX_EMACS RE_INTERVALS
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173
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174 #define RE_SYNTAX_AWK \
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175 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \
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176 | RE_NO_BK_PARENS | RE_NO_BK_REFS \
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177 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \
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178 | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_SHY_GROUPS \
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502
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179 | RE_NO_MINIMAL_MATCHING | RE_NO_MULTI_DIGIT_BK_REFS)
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428
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180
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181 #define RE_SYNTAX_POSIX_AWK \
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182 (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS)
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183
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184 #define RE_SYNTAX_GREP \
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185 (RE_BK_PLUS_QM | RE_CHAR_CLASSES \
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186 | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \
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187 | RE_NEWLINE_ALT | RE_NO_SHY_GROUPS \
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502
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188 | RE_NO_MINIMAL_MATCHING | RE_NO_MULTI_DIGIT_BK_REFS)
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428
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189
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190 #define RE_SYNTAX_EGREP \
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191 (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \
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192 | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \
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193 | RE_NEWLINE_ALT | RE_NO_BK_PARENS \
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194 | RE_NO_BK_VBAR | RE_NO_SHY_GROUPS \
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502
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195 | RE_NO_MINIMAL_MATCHING | RE_NO_MULTI_DIGIT_BK_REFS)
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428
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196
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197 #define RE_SYNTAX_POSIX_EGREP \
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502
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198 (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES | \
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199 RE_NO_MULTI_DIGIT_BK_REFS)
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428
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200
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201 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */
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202 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
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203
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204 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
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205
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206 /* Syntax bits common to both basic and extended POSIX regex syntax. */
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207 #define _RE_SYNTAX_POSIX_COMMON \
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208 (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \
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209 | RE_INTERVALS | RE_NO_EMPTY_RANGES | RE_NO_SHY_GROUPS \
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502
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210 | RE_NO_MINIMAL_MATCHING | RE_NO_MULTI_DIGIT_BK_REFS)
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428
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211
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212 #define RE_SYNTAX_POSIX_BASIC \
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213 (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
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214
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215 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
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216 RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this
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217 isn't minimal, since other operators, such as \`, aren't disabled. */
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218 #define RE_SYNTAX_POSIX_MINIMAL_BASIC \
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219 (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
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220
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221 #define RE_SYNTAX_POSIX_EXTENDED \
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222 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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223 | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
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224 | RE_NO_BK_PARENS | RE_NO_BK_VBAR \
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225 | RE_UNMATCHED_RIGHT_PAREN_ORD)
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226
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227 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
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228 replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */
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229 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \
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230 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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231 | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \
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232 | RE_NO_BK_PARENS | RE_NO_BK_REFS \
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233 | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD)
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234 /* [[[end syntaxes]]] */
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235
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236 /* Maximum number of duplicates an interval can allow. Some systems
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237 (erroneously) define this in other header files, but we want our
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238 value, so remove any previous define. */
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239 #ifdef RE_DUP_MAX
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240 #undef RE_DUP_MAX
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241 #endif
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242 #define RE_DUP_MAX ((1 << 15) - 1)
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243
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244
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245 /* POSIX `cflags' bits (i.e., information for `regcomp'). */
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246
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247 /* If this bit is set, then use extended regular expression syntax.
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248 If not set, then use basic regular expression syntax. */
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249 #define REG_EXTENDED 1
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250
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251 /* If this bit is set, then ignore case when matching.
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252 If not set, then case is significant. */
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253 #define REG_ICASE (REG_EXTENDED << 1)
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254
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255 /* If this bit is set, then anchors do not match at newline
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256 characters in the string.
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257 If not set, then anchors do match at newlines. */
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258 #define REG_NEWLINE (REG_ICASE << 1)
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259
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260 /* If this bit is set, then report only success or fail in regexec.
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261 If not set, then returns differ between not matching and errors. */
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262 #define REG_NOSUB (REG_NEWLINE << 1)
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263
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264
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265 /* POSIX `eflags' bits (i.e., information for regexec). */
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266
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267 /* If this bit is set, then the beginning-of-line operator doesn't match
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268 the beginning of the string (presumably because it's not the
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269 beginning of a line).
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270 If not set, then the beginning-of-line operator does match the
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271 beginning of the string. */
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272 #define REG_NOTBOL 1
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273
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274 /* Like REG_NOTBOL, except for the end-of-line. */
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275 #define REG_NOTEOL (1 << 1)
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276
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277
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278 /* If any error codes are removed, changed, or added, update the
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279 `re_error_msg' table in regex.c. */
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280 typedef enum
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281 {
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282 REG_NOERROR = 0, /* Success. */
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283 REG_NOMATCH, /* Didn't find a match (for regexec). */
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284
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285 /* POSIX regcomp return error codes. (In the order listed in the
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286 standard.) */
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287 REG_BADPAT, /* Invalid pattern. */
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288 REG_ECOLLATE, /* Not implemented. */
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289 REG_ECTYPE, /* Invalid character class name. */
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290 REG_EESCAPE, /* Trailing backslash. */
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291 REG_ESUBREG, /* Invalid back reference. */
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292 REG_EBRACK, /* Unmatched left bracket. */
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293 REG_EPAREN, /* Parenthesis imbalance. */
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294 REG_EBRACE, /* Unmatched \{. */
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295 REG_BADBR, /* Invalid contents of \{\}. */
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296 REG_ERANGE, /* Invalid range end. */
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297 REG_ESPACE, /* Ran out of memory. */
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298 REG_BADRPT, /* No preceding re for repetition op. */
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299
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300 /* Error codes we've added. */
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301 REG_EEND, /* Premature end. */
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302 REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
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303 REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
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304 #ifdef emacs
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305 ,REG_ESYNTAX /* Invalid syntax designator. */
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306 #endif
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307 #ifdef MULE
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308 ,REG_ERANGESPAN /* Ranges may not span charsets. */
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309 ,REG_ECATEGORY /* Invalid category designator */
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310 #endif
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311 } reg_errcode_t;
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312
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313 /* This data structure represents a compiled pattern. Before calling
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314 the pattern compiler, the fields `buffer', `allocated', `fastmap',
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315 `translate', and `no_sub' can be set. After the pattern has been
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316 compiled, the `re_nsub' field is available. All other fields are
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317 private to the regex routines. */
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318
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319 struct re_pattern_buffer
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320 {
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321 /* [[[begin pattern_buffer]]] */
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322 /* Space that holds the compiled pattern. It is declared as
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323 `unsigned char *' because its elements are
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324 sometimes used as array indexes. */
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325 unsigned char *buffer;
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326
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327 /* Number of bytes to which `buffer' points. */
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328 unsigned long allocated;
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329
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330 /* Number of bytes actually used in `buffer'. */
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331 unsigned long used;
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332
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333 /* Syntax setting with which the pattern was compiled. */
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334 reg_syntax_t syntax;
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335
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336 /* Pointer to a fastmap, if any, otherwise zero. re_search uses
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337 the fastmap, if there is one, to skip over impossible
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338 starting points for matches. */
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339 char *fastmap;
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340
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341 /* Either a translate table to apply to all characters before
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342 comparing them, or zero for no translation. The translation
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343 is applied to a pattern when it is compiled and to a string
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344 when it is matched. */
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446
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345 RE_TRANSLATE_TYPE translate;
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428
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346
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502
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347 /* Number of returnable groups found by the compiler. (This does
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348 not count shy groups.) */
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428
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349 size_t re_nsub;
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350
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502
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351 /* Total number of groups found by the compiler. (Including
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352 shy ones.) */
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353 int re_ngroups;
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354
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428
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355 /* Zero if this pattern cannot match the empty string, one else.
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356 Well, in truth it's used only in `re_search_2', to see
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357 whether or not we should use the fastmap, so we don't set
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358 this absolutely perfectly; see `re_compile_fastmap' (the
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359 `duplicate' case). */
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360 unsigned can_be_null : 1;
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361
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362 /* If REGS_UNALLOCATED, allocate space in the `regs' structure
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363 for `max (RE_NREGS, re_nsub + 1)' groups.
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364 If REGS_REALLOCATE, reallocate space if necessary.
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365 If REGS_FIXED, use what's there. */
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366 #define REGS_UNALLOCATED 0
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367 #define REGS_REALLOCATE 1
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368 #define REGS_FIXED 2
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369 unsigned regs_allocated : 2;
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370
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371 /* Set to zero when `regex_compile' compiles a pattern; set to one
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372 by `re_compile_fastmap' if it updates the fastmap. */
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373 unsigned fastmap_accurate : 1;
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374
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375 /* If set, `re_match_2' does not return information about
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376 subexpressions. */
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377 unsigned no_sub : 1;
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378
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379 /* If set, a beginning-of-line anchor doesn't match at the
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380 beginning of the string. */
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381 unsigned not_bol : 1;
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382
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383 /* Similarly for an end-of-line anchor. */
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384 unsigned not_eol : 1;
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385
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386 /* If true, an anchor at a newline matches. */
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387 unsigned newline_anchor : 1;
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388
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502
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389 unsigned warned_about_incompatible_back_references : 1;
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390
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391 /* Mapping between back references and groups (may not be
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392 equivalent with shy groups). */
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393 int *external_to_internal_register;
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394
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395 int external_to_internal_register_size;
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396
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428
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397 /* [[[end pattern_buffer]]] */
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398 };
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399
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400 typedef struct re_pattern_buffer regex_t;
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401
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402 /* Type for byte offsets within the string. POSIX mandates this. */
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403 typedef int regoff_t;
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404
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405
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406 /* This is the structure we store register match data in. See
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407 regex.texinfo for a full description of what registers match. */
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408 struct re_registers
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409 {
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410 unsigned num_regs;
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411 regoff_t *start;
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412 regoff_t *end;
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413 };
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414
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415
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416 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
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417 `re_match_2' returns information about at least this many registers
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418 the first time a `regs' structure is passed. */
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419 #ifndef RE_NREGS
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420 #define RE_NREGS 30
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421 #endif
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422
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423
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424 /* POSIX specification for registers. Aside from the different names than
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425 `re_registers', POSIX uses an array of structures, instead of a
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426 structure of arrays. */
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427 typedef struct
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|
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428 {
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|
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429 regoff_t rm_so; /* Byte offset from string's start to substring's start. */
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|
430 regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
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|
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431 } regmatch_t;
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432
|
|
|
433 /* Declarations for routines. */
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434
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|
|
435 /* Sets the current default syntax to SYNTAX, and return the old syntax.
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|
|
436 You can also simply assign to the `re_syntax_options' variable. */
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|
|
437 reg_syntax_t re_set_syntax (reg_syntax_t syntax);
|
|
|
438
|
|
|
439 /* Compile the regular expression PATTERN, with length LENGTH
|
|
|
440 and syntax given by the global `re_syntax_options', into the buffer
|
|
|
441 BUFFER. Return NULL if successful, and an error string if not. */
|
|
442
|
442 const char *re_compile_pattern (const char *pattern, int length,
|
|
428
|
443 struct re_pattern_buffer *buffer);
|
|
|
444
|
|
|
445
|
|
|
446 /* Compile a fastmap for the compiled pattern in BUFFER; used to
|
|
|
447 accelerate searches. Return 0 if successful and -2 if was an
|
|
|
448 internal error. */
|
|
|
449 int re_compile_fastmap (struct re_pattern_buffer *buffer);
|
|
|
450
|
|
|
451
|
|
|
452 /* Search in the string STRING (with length LENGTH) for the pattern
|
|
|
453 compiled into BUFFER. Start searching at position START, for RANGE
|
|
|
454 characters. Return the starting position of the match, -1 for no
|
|
|
455 match, or -2 for an internal error. Also return register
|
|
|
456 information in REGS (if REGS and BUFFER->no_sub are nonzero). */
|
|
442
|
457 int re_search (struct re_pattern_buffer *buffer, const char *string,
|
|
428
|
458 int length, int start, int range,
|
|
|
459 struct re_registers *regs);
|
|
|
460
|
|
|
461
|
|
|
462 /* Like `re_search', but search in the concatenation of STRING1 and
|
|
|
463 STRING2. Also, stop searching at index START + STOP. */
|
|
442
|
464 int re_search_2 (struct re_pattern_buffer *buffer, const char *string1,
|
|
|
465 int length1, const char *string2, int length2, int start,
|
|
428
|
466 int range, struct re_registers *regs, int stop);
|
|
|
467
|
|
|
468
|
|
|
469 /* Like `re_search', but return how many characters in STRING the regexp
|
|
|
470 in BUFFER matched, starting at position START. */
|
|
442
|
471 int re_match (struct re_pattern_buffer *buffer, const char *string,
|
|
428
|
472 int length, int start, struct re_registers *regs);
|
|
|
473
|
|
|
474
|
|
|
475 /* Relates to `re_match' as `re_search_2' relates to `re_search'. */
|
|
442
|
476 int re_match_2 (struct re_pattern_buffer *buffer, const char *string1,
|
|
|
477 int length1, const char *string2, int length2,
|
|
428
|
478 int start, struct re_registers *regs, int stop);
|
|
|
479
|
|
|
480
|
|
|
481 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
|
|
|
482 ENDS. Subsequent matches using BUFFER and REGS will use this memory
|
|
|
483 for recording register information. STARTS and ENDS must be
|
|
|
484 allocated with malloc, and must each be at least `NUM_REGS * sizeof
|
|
|
485 (regoff_t)' bytes long.
|
|
|
486
|
|
|
487 If NUM_REGS == 0, then subsequent matches should allocate their own
|
|
|
488 register data.
|
|
|
489
|
|
|
490 Unless this function is called, the first search or match using
|
|
|
491 PATTERN_BUFFER will allocate its own register data, without
|
|
|
492 freeing the old data. */
|
|
|
493 void re_set_registers (struct re_pattern_buffer *buffer,
|
|
|
494 struct re_registers *regs, unsigned num_regs,
|
|
|
495 regoff_t *starts, regoff_t *ends);
|
|
|
496
|
|
|
497 #ifdef _REGEX_RE_COMP
|
|
|
498 /* 4.2 bsd compatibility. */
|
|
442
|
499 char *re_comp (const char *);
|
|
|
500 int re_exec (const char *);
|
|
428
|
501 #endif
|
|
|
502
|
|
|
503 /* POSIX compatibility. */
|
|
442
|
504 int regcomp (regex_t *preg, const char *pattern, int cflags);
|
|
|
505 int regexec (const regex_t *preg, const char *string, size_t nmatch,
|
|
428
|
506 regmatch_t pmatch[], int eflags);
|
|
442
|
507 size_t regerror (int errcode, const regex_t *preg, char *errbuf,
|
|
428
|
508 size_t errbuf_size);
|
|
|
509 void regfree (regex_t *preg);
|
|
|
510
|
|
440
|
511 #endif /* INCLUDED_regex_h_ */
|
