/*
* regexp.h: wrappers for regexp handling
*
* Copyright (C) 2009-2016 David Lutterkort
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: David Lutterkort <lutter@redhat.com>
*/
#ifndef REGEXP_H_
#define REGEXP_H_
#include <stdio.h>
#include <regex.h>
struct regexp {
unsigned int ref;
struct info *info;
struct string *pattern;
struct re_pattern_buffer *re;
unsigned int nocase : 1;
};
void print_regexp(FILE *out, struct regexp *regexp);
/* Make a regexp with pattern PAT, which is not copied. Ownership
* of INFO is taken.
*/
struct regexp *make_regexp(struct info *info, char *pat, int nocase);
/* Make a regexp with pattern PAT, which is copied. Ownership of INFO is
* taken. Escape sequences like \n in PAT are interpreted.
*/
struct regexp *make_regexp_unescape(struct info *info, const char *pat,
int nocase);
/* Return 1 if R is an empty pattern, i.e. one consisting of nothing but
'(' and ')' characters, 0 otherwise */
int regexp_is_empty_pattern(struct regexp *r);
/* Make a regexp that matches TEXT literally; the string TEXT
* is not used by the returned rgexp and must be freed by the caller
*/
struct regexp *make_regexp_literal(struct info *info, const char *text);
/* Make a regexp from a glob pattern */
struct regexp *make_regexp_from_glob(struct info *info, const char *glob);
/* Do not call directly, use UNREF instead */
void free_regexp(struct regexp *regexp);
/* Compile R->PATTERN into R->RE; return -1 and print an error
* if compilation fails. Return 0 otherwise
*/
int regexp_compile(struct regexp *r);
/* Check the syntax of R->PATTERN; return -1 if the pattern has a syntax
* error, and a string indicating the error in *C. Return 0 if the pattern
* is a valid regular expression.
*/
int regexp_check(struct regexp *r, const char **msg);
/* Call RE_MATCH on R->RE and return its result; if R hasn't been compiled
* yet, compile it. Return -3 if compilation fails
*/
int regexp_match(struct regexp *r, const char *string, const int size,
const int start, struct re_registers *regs);
/* Return 1 if R matches the empty string, 0 otherwise */
int regexp_matches_empty(struct regexp *r);
/* Return the number of subexpressions (parentheses) inside R. May cause
* compilation of R; return -1 if compilation fails.
*/
int regexp_nsub(struct regexp *r);
struct regexp *
regexp_union(struct info *, struct regexp *r1, struct regexp *r2);
struct regexp *
regexp_concat(struct info *, struct regexp *r1, struct regexp *r2);
struct regexp *
regexp_union_n(struct info *, int n, struct regexp **r);
struct regexp *
regexp_concat_n(struct info *, int n, struct regexp **r);
struct regexp *
regexp_iter(struct info *info, struct regexp *r, int min, int max);
/* Return a new REGEXP that matches all the words matched by R1 but
* not by R2
*/
struct regexp *
regexp_minus(struct info *info, struct regexp *r1, struct regexp *r2);
struct regexp *
regexp_maybe(struct info *info, struct regexp *r);
struct regexp *regexp_make_empty(struct info *);
/* Free up temporary data structures, most importantly compiled
regular expressions */
void regexp_release(struct regexp *regexp);
/* Produce a printable representation of R. The result will in general not
be equivalent to the passed regular expression, but be easier for
humans to read. */
char *regexp_escape(const struct regexp *r);
/* If R is case-insensitive, expand its pattern so that it matches the same
* string even when used in a case-sensitive match. */
char *regexp_expand_nocase(struct regexp *r);
#endif
/*
* Local variables:
* indent-tabs-mode: nil
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/