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Diffstat (limited to 'regex.h')
| -rw-r--r-- | regex.h | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/regex.h b/regex.h new file mode 100644 index 0000000000..8481bc84b3 --- /dev/null +++ b/regex.h @@ -0,0 +1,276 @@ +/* Definitions for data structures callers pass the regex library. + + Copyright (C) 1985, 1989-90 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 1, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +/* Multi-byte extension added May, 1993 by t^2 (Takahiro Tanimoto) + Last change: May 21, 1993 by t^2 */ + + +#ifndef __REGEXP_LIBRARY +#define __REGEXP_LIBRARY + +/* Define number of parens for which we record the beginnings and ends. + This affects how much space the `struct re_registers' type takes up. */ +#ifndef RE_NREGS +#define RE_NREGS 10 +#endif + +#define BYTEWIDTH 8 + + +/* Maximum number of duplicates an interval can allow. */ +#ifndef RE_DUP_MAX +#define RE_DUP_MAX ((1 << 15) - 1) +#endif + + +/* This defines the various regexp syntaxes. */ +extern long obscure_syntax; + + +/* The following bits are used in the obscure_syntax variable to choose among + alternative regexp syntaxes. */ + +/* If this bit is set, plain parentheses serve as grouping, and backslash + parentheses are needed for literal searching. + If not set, backslash-parentheses are grouping, and plain parentheses + are for literal searching. */ +#define RE_NO_BK_PARENS 1L + +/* If this bit is set, plain | serves as the `or'-operator, and \| is a + literal. + If not set, \| serves as the `or'-operator, and | is a literal. */ +#define RE_NO_BK_VBAR (1L << 1) + +/* If this bit is not set, plain + or ? serves as an operator, and \+, \? are + literals. + If set, \+, \? are operators and plain +, ? are literals. */ +#define RE_BK_PLUS_QM (1L << 2) + +/* If this bit is set, | binds tighter than ^ or $. + If not set, the contrary. */ +#define RE_TIGHT_VBAR (1L << 3) + +/* If this bit is set, then treat newline as an OR operator. + If not set, treat it as a normal character. */ +#define RE_NEWLINE_OR (1L << 4) + +/* If this bit is set, then special characters may act as normal + characters in some contexts. Specifically, this applies to: + ^ -- only special at the beginning, or after ( or |; + $ -- only special at the end, or before ) or |; + *, +, ? -- only special when not after the beginning, (, or |. + If this bit is not set, special characters (such as *, ^, and $) + always have their special meaning regardless of the surrounding + context. */ +#define RE_CONTEXT_INDEP_OPS (1L << 5) + +/* If this bit is not set, then \ before anything inside [ and ] is taken as + a real \. + If set, then such a \ escapes the following character. This is a + special case for awk. */ +#define RE_AWK_CLASS_HACK (1L << 6) + +/* If this bit is set, then \{ and \} or { and } serve as interval operators. + If not set, then \{ and \} and { and } are treated as literals. */ +#define RE_INTERVALS (1L << 7) + +/* If this bit is not set, then \{ and \} serve as interval operators and + { and } are literals. + If set, then { and } serve as interval operators and \{ and \} are + literals. */ +#define RE_NO_BK_CURLY_BRACES (1L << 8) + +/* If this bit is set, then character classes are supported; they are: + [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], + [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. + If not set, then character classes are not supported. */ +#define RE_CHAR_CLASSES (1L << 9) + +/* If this bit is set, then the dot re doesn't match a null byte. + If not set, it does. */ +#define RE_DOT_NOT_NULL (1L << 10) + +/* If this bit is set, then [^...] doesn't match a newline. + If not set, it does. */ +#define RE_HAT_NOT_NEWLINE (1L << 11) + +/* If this bit is set, back references are recognized. + If not set, they aren't. */ +#define RE_NO_BK_REFS (1L << 12) + +/* If this bit is set, back references must refer to a preceding + subexpression. If not set, a back reference to a nonexistent + subexpression is treated as literal characters. */ +#define RE_NO_EMPTY_BK_REF (1L << 13) + +/* If this bit is set, bracket expressions can't be empty. + If it is set, they can be empty. */ +#define RE_NO_EMPTY_BRACKETS (1L << 14) + +/* If this bit is set, then *, +, ? and { cannot be first in an re or + immediately after a |, or a (. Furthermore, a | cannot be first or + last in an re, or immediately follow another | or a (. Also, a ^ + cannot appear in a nonleading position and a $ cannot appear in a + nontrailing position (outside of bracket expressions, that is). */ +#define RE_CONTEXTUAL_INVALID_OPS (1L << 15) + +/* If this bit is set, then +, ? and | aren't recognized as operators. + If it's not, they are. */ +#define RE_LIMITED_OPS (1L << 16) + +/* If this bit is set, then an ending range point has to collate higher + or equal to the starting range point. + If it's not set, then when the ending range point collates higher + than the starting range point, the range is just considered empty. */ +#define RE_NO_EMPTY_RANGES (1L << 17) + +/* If this bit is set, then a hyphen (-) can't be an ending range point. + If it isn't, then it can. */ +#define RE_NO_HYPHEN_RANGE_END (1L << 18) + + +/* Define combinations of bits for the standard possibilities. */ +#define RE_SYNTAX_POSIX_AWK (RE_NO_BK_PARENS | RE_NO_BK_VBAR \ + | RE_CONTEXT_INDEP_OPS) +#define RE_SYNTAX_AWK (RE_NO_BK_PARENS | RE_NO_BK_VBAR | RE_AWK_CLASS_HACK) +#define RE_SYNTAX_EGREP (RE_NO_BK_PARENS | RE_NO_BK_VBAR \ + | RE_CONTEXT_INDEP_OPS | RE_NEWLINE_OR) +#define RE_SYNTAX_GREP (RE_BK_PLUS_QM | RE_NEWLINE_OR) +#define RE_SYNTAX_EMACS 0 +#define RE_SYNTAX_POSIX_BASIC (RE_INTERVALS | RE_BK_PLUS_QM \ + | RE_CHAR_CLASSES | RE_DOT_NOT_NULL \ + | RE_HAT_NOT_NEWLINE | RE_NO_EMPTY_BK_REF \ + | RE_NO_EMPTY_BRACKETS | RE_LIMITED_OPS \ + | RE_NO_EMPTY_RANGES | RE_NO_HYPHEN_RANGE_END) + +#define RE_SYNTAX_POSIX_EXTENDED (RE_INTERVALS | RE_NO_BK_CURLY_BRACES \ + | RE_NO_BK_VBAR | RE_NO_BK_PARENS \ + | RE_HAT_NOT_NEWLINE | RE_CHAR_CLASSES \ + | RE_NO_EMPTY_BRACKETS | RE_CONTEXTUAL_INVALID_OPS \ + | RE_NO_BK_REFS | RE_NO_EMPTY_RANGES \ + | RE_NO_HYPHEN_RANGE_END) + +/* For multi-byte char support */ +#define RE_MBCTYPE_EUC (1L << 19) +#define RE_MBCTYPE_SJIS (1L << 20) +#define RE_MBCTYPE_MASK (RE_MBCTYPE_EUC | RE_MBCTYPE_SJIS) + +#undef ismbchar +#define ismbchar(c) \ + (obscure_syntax & RE_MBCTYPE_EUC \ + ? ((unsigned char) (c) >= 0x80) \ + : (obscure_syntax & RE_MBCTYPE_SJIS \ + ? (( 0x80 <= (unsigned char) (c) \ + && (unsigned char) (c) <= 0x9f) \ + || (0xe0 <= (unsigned char) (c))) \ + : 0)) + +/* This data structure is used to represent a compiled pattern. */ + +struct re_pattern_buffer + { + char *buffer; /* Space holding the compiled pattern commands. */ + long allocated; /* Size of space that `buffer' points to. */ + long used; /* Length of portion of buffer actually occupied */ + char *fastmap; /* Pointer to fastmap, if any, or zero if none. */ + /* re_search uses the fastmap, if there is one, + to skip over totally implausible characters. */ + char *translate; /* Translate table to apply to all characters before + comparing, or zero for no translation. + The translation is applied to a pattern when it is + compiled and to data when it is matched. */ + char fastmap_accurate; + /* Set to zero when a new pattern is stored, + set to one when the fastmap is updated from it. */ + char can_be_null; /* Set to one by compiling fastmap + if this pattern might match the null string. + It does not necessarily match the null string + in that case, but if this is zero, it cannot. + 2 as value means can match null string + but at end of range or before a character + listed in the fastmap. */ + }; + + +/* search.c (search_buffer) needs this one value. It is defined both in + regex.c and here. */ +#define RE_EXACTN_VALUE 1 + + +/* Structure to store register contents data in. + + Pass the address of such a structure as an argument to re_match, etc., + if you want this information back. + + For i from 1 to RE_NREGS - 1, start[i] records the starting index in + the string of where the ith subexpression matched, and end[i] records + one after the ending index. start[0] and end[0] are analogous, for + the entire pattern. */ + +struct re_registers + { + int start[RE_NREGS]; + int end[RE_NREGS]; + }; + + + +#ifdef __STDC__ + +extern char *re_compile_pattern (char *, size_t, struct re_pattern_buffer *); +/* Is this really advertised? */ +extern void re_compile_fastmap (struct re_pattern_buffer *); +extern int re_search (struct re_pattern_buffer *, char*, int, int, int, + struct re_registers *); +extern int re_search_2 (struct re_pattern_buffer *, char *, int, + char *, int, int, int, + struct re_registers *, int); +extern int re_match (struct re_pattern_buffer *, char *, int, int, + struct re_registers *); +extern int re_match_2 (struct re_pattern_buffer *, char *, int, + char *, int, int, struct re_registers *, int); +extern long re_set_syntax (long syntax); + +#ifndef RUBY +/* 4.2 bsd compatibility. */ +extern char *re_comp (char *); +extern int re_exec (char *); +#endif + +#else /* !__STDC__ */ + +extern char *re_compile_pattern (); +/* Is this really advertised? */ +extern void re_compile_fastmap (); +extern int re_search (), re_search_2 (); +extern int re_match (), re_match_2 (); +extern long re_set_syntax(); + +#ifndef RUBY +/* 4.2 bsd compatibility. */ +extern char *re_comp (); +extern int re_exec (); +#endif + +#endif /* __STDC__ */ + + +#ifdef SYNTAX_TABLE +extern char *re_syntax_table; +#endif + +#endif /* !__REGEXP_LIBRARY */ |