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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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156 /* This global variable defines the particular regexp syntax to use (for
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157 some interfaces). When a regexp is compiled, the syntax used is
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158 stored in the pattern buffer, so changing this does not affect
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159 already-compiled regexps. */
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160 extern reg_syntax_t re_syntax_options;
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161
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162 /* Define combinations of the above bits for the standard possibilities.
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163 (The [[[ comments delimit what gets put into the Texinfo file, so
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164 don't delete them!) */
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165 /* [[[begin syntaxes]]] */
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166 #define RE_SYNTAX_EMACS RE_INTERVALS
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167
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168 #define RE_SYNTAX_AWK \
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169 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \
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170 | RE_NO_BK_PARENS | RE_NO_BK_REFS \
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171 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \
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172 | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_SHY_GROUPS \
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173 | RE_NO_MINIMAL_MATCHING)
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174
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175 #define RE_SYNTAX_POSIX_AWK \
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176 (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS)
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177
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178 #define RE_SYNTAX_GREP \
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179 (RE_BK_PLUS_QM | RE_CHAR_CLASSES \
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180 | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \
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181 | RE_NEWLINE_ALT | RE_NO_SHY_GROUPS \
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182 | RE_NO_MINIMAL_MATCHING)
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183
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184 #define RE_SYNTAX_EGREP \
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185 (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \
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186 | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \
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187 | RE_NEWLINE_ALT | RE_NO_BK_PARENS \
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188 | RE_NO_BK_VBAR | RE_NO_SHY_GROUPS \
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189 | RE_NO_MINIMAL_MATCHING)
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190
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191 #define RE_SYNTAX_POSIX_EGREP \
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192 (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
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193
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194 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */
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195 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
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196
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197 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
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198
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199 /* Syntax bits common to both basic and extended POSIX regex syntax. */
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200 #define _RE_SYNTAX_POSIX_COMMON \
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201 (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \
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202 | RE_INTERVALS | RE_NO_EMPTY_RANGES | RE_NO_SHY_GROUPS \
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203 | RE_NO_MINIMAL_MATCHING)
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204
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205 #define RE_SYNTAX_POSIX_BASIC \
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206 (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
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207
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208 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
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209 RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this
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210 isn't minimal, since other operators, such as \`, aren't disabled. */
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211 #define RE_SYNTAX_POSIX_MINIMAL_BASIC \
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212 (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
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213
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214 #define RE_SYNTAX_POSIX_EXTENDED \
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215 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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216 | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
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217 | RE_NO_BK_PARENS | RE_NO_BK_VBAR \
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218 | RE_UNMATCHED_RIGHT_PAREN_ORD)
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219
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220 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
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221 replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */
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222 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \
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223 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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224 | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \
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225 | RE_NO_BK_PARENS | RE_NO_BK_REFS \
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226 | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD)
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227 /* [[[end syntaxes]]] */
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228
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229 /* Maximum number of duplicates an interval can allow. Some systems
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230 (erroneously) define this in other header files, but we want our
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231 value, so remove any previous define. */
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232 #ifdef RE_DUP_MAX
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233 #undef RE_DUP_MAX
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234 #endif
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235 #define RE_DUP_MAX ((1 << 15) - 1)
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236
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237
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238 /* POSIX `cflags' bits (i.e., information for `regcomp'). */
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239
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240 /* If this bit is set, then use extended regular expression syntax.
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241 If not set, then use basic regular expression syntax. */
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242 #define REG_EXTENDED 1
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243
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244 /* If this bit is set, then ignore case when matching.
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245 If not set, then case is significant. */
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246 #define REG_ICASE (REG_EXTENDED << 1)
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247
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248 /* If this bit is set, then anchors do not match at newline
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249 characters in the string.
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250 If not set, then anchors do match at newlines. */
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251 #define REG_NEWLINE (REG_ICASE << 1)
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252
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253 /* If this bit is set, then report only success or fail in regexec.
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254 If not set, then returns differ between not matching and errors. */
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255 #define REG_NOSUB (REG_NEWLINE << 1)
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256
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257
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258 /* POSIX `eflags' bits (i.e., information for regexec). */
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259
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260 /* If this bit is set, then the beginning-of-line operator doesn't match
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261 the beginning of the string (presumably because it's not the
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262 beginning of a line).
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263 If not set, then the beginning-of-line operator does match the
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264 beginning of the string. */
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265 #define REG_NOTBOL 1
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266
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267 /* Like REG_NOTBOL, except for the end-of-line. */
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268 #define REG_NOTEOL (1 << 1)
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269
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270
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271 /* If any error codes are removed, changed, or added, update the
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272 `re_error_msg' table in regex.c. */
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273 typedef enum
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274 {
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275 REG_NOERROR = 0, /* Success. */
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276 REG_NOMATCH, /* Didn't find a match (for regexec). */
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277
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278 /* POSIX regcomp return error codes. (In the order listed in the
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279 standard.) */
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280 REG_BADPAT, /* Invalid pattern. */
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281 REG_ECOLLATE, /* Not implemented. */
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282 REG_ECTYPE, /* Invalid character class name. */
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283 REG_EESCAPE, /* Trailing backslash. */
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284 REG_ESUBREG, /* Invalid back reference. */
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285 REG_EBRACK, /* Unmatched left bracket. */
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286 REG_EPAREN, /* Parenthesis imbalance. */
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287 REG_EBRACE, /* Unmatched \{. */
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288 REG_BADBR, /* Invalid contents of \{\}. */
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289 REG_ERANGE, /* Invalid range end. */
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290 REG_ESPACE, /* Ran out of memory. */
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291 REG_BADRPT, /* No preceding re for repetition op. */
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292
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293 /* Error codes we've added. */
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294 REG_EEND, /* Premature end. */
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295 REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
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296 REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
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297 #ifdef emacs
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298 ,REG_ESYNTAX /* Invalid syntax designator. */
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299 #endif
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300 #ifdef MULE
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301 ,REG_ERANGESPAN /* Ranges may not span charsets. */
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302 ,REG_ECATEGORY /* Invalid category designator */
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303 #endif
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304 } reg_errcode_t;
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305
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306 /* This data structure represents a compiled pattern. Before calling
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307 the pattern compiler, the fields `buffer', `allocated', `fastmap',
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308 `translate', and `no_sub' can be set. After the pattern has been
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309 compiled, the `re_nsub' field is available. All other fields are
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310 private to the regex routines. */
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311
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312 struct re_pattern_buffer
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313 {
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314 /* [[[begin pattern_buffer]]] */
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315 /* Space that holds the compiled pattern. It is declared as
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316 `unsigned char *' because its elements are
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317 sometimes used as array indexes. */
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318 unsigned char *buffer;
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319
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320 /* Number of bytes to which `buffer' points. */
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321 unsigned long allocated;
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322
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323 /* Number of bytes actually used in `buffer'. */
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324 unsigned long used;
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325
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326 /* Syntax setting with which the pattern was compiled. */
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327 reg_syntax_t syntax;
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328
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329 /* Pointer to a fastmap, if any, otherwise zero. re_search uses
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330 the fastmap, if there is one, to skip over impossible
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331 starting points for matches. */
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332 char *fastmap;
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333
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334 /* Either a translate table to apply to all characters before
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335 comparing them, or zero for no translation. The translation
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336 is applied to a pattern when it is compiled and to a string
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337 when it is matched. */
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446
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338 RE_TRANSLATE_TYPE translate;
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428
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339
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340 /* Number of subexpressions found by the compiler. */
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341 size_t re_nsub;
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342
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343 /* Zero if this pattern cannot match the empty string, one else.
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344 Well, in truth it's used only in `re_search_2', to see
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345 whether or not we should use the fastmap, so we don't set
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346 this absolutely perfectly; see `re_compile_fastmap' (the
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347 `duplicate' case). */
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348 unsigned can_be_null : 1;
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349
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350 /* If REGS_UNALLOCATED, allocate space in the `regs' structure
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351 for `max (RE_NREGS, re_nsub + 1)' groups.
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352 If REGS_REALLOCATE, reallocate space if necessary.
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353 If REGS_FIXED, use what's there. */
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354 #define REGS_UNALLOCATED 0
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355 #define REGS_REALLOCATE 1
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356 #define REGS_FIXED 2
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357 unsigned regs_allocated : 2;
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358
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359 /* Set to zero when `regex_compile' compiles a pattern; set to one
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360 by `re_compile_fastmap' if it updates the fastmap. */
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361 unsigned fastmap_accurate : 1;
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362
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363 /* If set, `re_match_2' does not return information about
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364 subexpressions. */
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365 unsigned no_sub : 1;
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366
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367 /* If set, a beginning-of-line anchor doesn't match at the
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368 beginning of the string. */
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369 unsigned not_bol : 1;
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370
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371 /* Similarly for an end-of-line anchor. */
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372 unsigned not_eol : 1;
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373
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374 /* If true, an anchor at a newline matches. */
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375 unsigned newline_anchor : 1;
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376
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377 /* [[[end pattern_buffer]]] */
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378 };
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379
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380 typedef struct re_pattern_buffer regex_t;
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381
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382 /* Type for byte offsets within the string. POSIX mandates this. */
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383 typedef int regoff_t;
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384
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385
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386 /* This is the structure we store register match data in. See
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387 regex.texinfo for a full description of what registers match. */
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388 struct re_registers
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389 {
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390 unsigned num_regs;
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391 regoff_t *start;
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392 regoff_t *end;
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393 };
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394
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395
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396 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
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397 `re_match_2' returns information about at least this many registers
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398 the first time a `regs' structure is passed. */
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399 #ifndef RE_NREGS
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400 #define RE_NREGS 30
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401 #endif
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402
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403
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404 /* POSIX specification for registers. Aside from the different names than
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405 `re_registers', POSIX uses an array of structures, instead of a
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406 structure of arrays. */
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407 typedef struct
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408 {
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409 regoff_t rm_so; /* Byte offset from string's start to substring's start. */
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410 regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
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411 } regmatch_t;
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412
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413 /* Declarations for routines. */
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414
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415 /* Sets the current default syntax to SYNTAX, and return the old syntax.
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416 You can also simply assign to the `re_syntax_options' variable. */
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417 reg_syntax_t re_set_syntax (reg_syntax_t syntax);
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418
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419 /* Compile the regular expression PATTERN, with length LENGTH
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420 and syntax given by the global `re_syntax_options', into the buffer
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421 BUFFER. Return NULL if successful, and an error string if not. */
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442
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422 const char *re_compile_pattern (const char *pattern, int length,
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428
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423 struct re_pattern_buffer *buffer);
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424
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425
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426 /* Compile a fastmap for the compiled pattern in BUFFER; used to
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427 accelerate searches. Return 0 if successful and -2 if was an
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428 internal error. */
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429 int re_compile_fastmap (struct re_pattern_buffer *buffer);
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430
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431
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432 /* Search in the string STRING (with length LENGTH) for the pattern
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433 compiled into BUFFER. Start searching at position START, for RANGE
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434 characters. Return the starting position of the match, -1 for no
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435 match, or -2 for an internal error. Also return register
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436 information in REGS (if REGS and BUFFER->no_sub are nonzero). */
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442
|
437 int re_search (struct re_pattern_buffer *buffer, const char *string,
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428
|
438 int length, int start, int range,
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439 struct re_registers *regs);
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440
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441
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442 /* Like `re_search', but search in the concatenation of STRING1 and
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443 STRING2. Also, stop searching at index START + STOP. */
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442
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444 int re_search_2 (struct re_pattern_buffer *buffer, const char *string1,
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445 int length1, const char *string2, int length2, int start,
|
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428
|
446 int range, struct re_registers *regs, int stop);
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447
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448
|
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449 /* Like `re_search', but return how many characters in STRING the regexp
|
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450 in BUFFER matched, starting at position START. */
|
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442
|
451 int re_match (struct re_pattern_buffer *buffer, const char *string,
|
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428
|
452 int length, int start, struct re_registers *regs);
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453
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454
|
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455 /* Relates to `re_match' as `re_search_2' relates to `re_search'. */
|
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442
|
456 int re_match_2 (struct re_pattern_buffer *buffer, const char *string1,
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457 int length1, const char *string2, int length2,
|
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428
|
458 int start, struct re_registers *regs, int stop);
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459
|
|
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460
|
|
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461 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
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462 ENDS. Subsequent matches using BUFFER and REGS will use this memory
|
|
|
463 for recording register information. STARTS and ENDS must be
|
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464 allocated with malloc, and must each be at least `NUM_REGS * sizeof
|
|
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465 (regoff_t)' bytes long.
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466
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467 If NUM_REGS == 0, then subsequent matches should allocate their own
|
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468 register data.
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469
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|
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470 Unless this function is called, the first search or match using
|
|
|
471 PATTERN_BUFFER will allocate its own register data, without
|
|
|
472 freeing the old data. */
|
|
|
473 void re_set_registers (struct re_pattern_buffer *buffer,
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|
|
474 struct re_registers *regs, unsigned num_regs,
|
|
|
475 regoff_t *starts, regoff_t *ends);
|
|
|
476
|
|
|
477 #ifdef _REGEX_RE_COMP
|
|
|
478 /* 4.2 bsd compatibility. */
|
|
442
|
479 char *re_comp (const char *);
|
|
|
480 int re_exec (const char *);
|
|
428
|
481 #endif
|
|
|
482
|
|
|
483 /* POSIX compatibility. */
|
|
442
|
484 int regcomp (regex_t *preg, const char *pattern, int cflags);
|
|
|
485 int regexec (const regex_t *preg, const char *string, size_t nmatch,
|
|
428
|
486 regmatch_t pmatch[], int eflags);
|
|
442
|
487 size_t regerror (int errcode, const regex_t *preg, char *errbuf,
|
|
428
|
488 size_t errbuf_size);
|
|
|
489 void regfree (regex_t *preg);
|
|
|
490
|
|
440
|
491 #endif /* INCLUDED_regex_h_ */
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