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comparison regex.h @ 2344:6d1817aab7c9

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Update the copyright. (RE_SHY_GROUPS): New value. (RE_UNMATCHED_RIGHT_PAREN_ORD): Renumber. (RE_SYNTAX_EMACS): Add RE_SHY_GROUPS.
author Stefan Monnier <monnier@iro.umontreal.ca>
date Wed, 08 Mar 2000 23:24:54 +0000
parents 90fc17cfc883
children d0b3c2f6b497
comparison
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2343:5bc9f02339fb 2344:6d1817aab7c9
1 /* Definitions for data structures and routines for the regular 1 /* Definitions for data structures and routines for the regular
2 expression library, version 0.12. 2 expression library, version 0.12.
3 3
4 Copyright (C) 1985, 89, 90, 91, 92, 93, 95 Free Software Foundation, Inc. 4 Copyright (C) 1985,89,90,91,92,93,95,2000 Free Software Foundation, Inc.
5 5
6 This program is free software; you can redistribute it and/or modify 6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by 7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option) 8 the Free Software Foundation; either version 2, or (at your option)
9 any later version. 9 any later version.
133 133
134 /* If this bit is set, succeed as soon as we match the whole pattern, 134 /* If this bit is set, succeed as soon as we match the whole pattern,
135 without further backtracking. */ 135 without further backtracking. */
136 #define RE_NO_POSIX_BACKTRACKING (RE_NO_EMPTY_RANGES << 1) 136 #define RE_NO_POSIX_BACKTRACKING (RE_NO_EMPTY_RANGES << 1)
137 137
138 /* If this bit is set, then (?:...) is treated as a shy group. */
139 #define RE_SHY_GROUPS (RE_NO_POSIX_BACKTRACKING << 1)
140
138 /* If this bit is set, then an unmatched ) is ordinary. 141 /* If this bit is set, then an unmatched ) is ordinary.
139 If not set, then an unmatched ) is invalid. */ 142 If not set, then an unmatched ) is invalid. */
140 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_POSIX_BACKTRACKING << 1) 143 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_SHY_GROUPS << 1)
141 144
142 /* This global variable defines the particular regexp syntax to use (for 145 /* This global variable defines the particular regexp syntax to use (for
143 some interfaces). When a regexp is compiled, the syntax used is 146 some interfaces). When a regexp is compiled, the syntax used is
144 stored in the pattern buffer, so changing this does not affect 147 stored in the pattern buffer, so changing this does not affect
145 already-compiled regexps. */ 148 already-compiled regexps. */
154 157
155 /* Define combinations of the above bits for the standard possibilities. 158 /* Define combinations of the above bits for the standard possibilities.
156 (The [[[ comments delimit what gets put into the Texinfo file, so 159 (The [[[ comments delimit what gets put into the Texinfo file, so
157 don't delete them!) */ 160 don't delete them!) */
158 /* [[[begin syntaxes]]] */ 161 /* [[[begin syntaxes]]] */
159 #define RE_SYNTAX_EMACS (RE_CHAR_CLASSES | RE_INTERVALS) 162 #define RE_SYNTAX_EMACS (RE_CHAR_CLASSES | RE_INTERVALS | RE_SHY_GROUPS)
160 163
161 #define RE_SYNTAX_AWK \ 164 #define RE_SYNTAX_AWK \
162 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ 165 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \
163 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ 166 | RE_NO_BK_PARENS | RE_NO_BK_REFS \
164 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ 167 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \
329 size_t re_nsub; 332 size_t re_nsub;
330 333
331 /* Zero if this pattern cannot match the empty string, one else. 334 /* Zero if this pattern cannot match the empty string, one else.
332 Well, in truth it's used only in `re_search_2', to see 335 Well, in truth it's used only in `re_search_2', to see
333 whether or not we should use the fastmap, so we don't set 336 whether or not we should use the fastmap, so we don't set
334 this absolutely perfectly; see `re_compile_fastmap' (the 337 this absolutely perfectly; see `re_compile_fastmap'. */
335 `duplicate' case). */
336 unsigned can_be_null : 1; 338 unsigned can_be_null : 1;
337 339
338 /* If REGS_UNALLOCATED, allocate space in the `regs' structure 340 /* If REGS_UNALLOCATED, allocate space in the `regs' structure
339 for `max (RE_NREGS, re_nsub + 1)' groups. 341 for `max (RE_NREGS, re_nsub + 1)' groups.
340 If REGS_REALLOCATE, reallocate space if necessary. 342 If REGS_REALLOCATE, reallocate space if necessary.