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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_regexp_h__
#define INCLUDE_regexp_h__
#include "git2_util.h"
#if defined(GIT_REGEX_BUILTIN) || defined(GIT_REGEX_PCRE)
# include "pcre.h"
typedef pcre *git_regexp;
# define GIT_REGEX_INIT NULL
#elif defined(GIT_REGEX_PCRE2)
# define PCRE2_CODE_UNIT_WIDTH 8
# include <pcre2.h>
typedef pcre2_code *git_regexp;
# define GIT_REGEX_INIT NULL
#elif defined(GIT_REGEX_REGCOMP) || defined(GIT_REGEX_REGCOMP_L)
# include <regex.h>
typedef regex_t git_regexp;
# define GIT_REGEX_INIT { 0 }
#else
# error "No regex backend"
#endif
/** Options supported by @git_regexp_compile. */
typedef enum {
/** Enable case-insensitive matching */
GIT_REGEXP_ICASE = (1 << 0)
} git_regexp_flags_t;
/** Structure containing information about regular expression matching groups */
typedef struct {
/** Start of the given match. -1 if the group didn't match anything */
ssize_t start;
/** End of the given match. -1 if the group didn't match anything */
ssize_t end;
} git_regmatch;
/**
* Compile a regular expression. The compiled expression needs to
* be cleaned up afterwards with `git_regexp_dispose`.
*
* @param r Pointer to the storage where to initialize the regular expression.
* @param pattern The pattern that shall be compiled.
* @param flags Flags to alter how the pattern shall be handled.
* 0 for defaults, otherwise see @git_regexp_flags_t.
* @return 0 on success, otherwise a negative return value.
*/
int git_regexp_compile(git_regexp *r, const char *pattern, int flags);
/**
* Free memory associated with the regular expression
*
* @param r The regular expression structure to dispose.
*/
void git_regexp_dispose(git_regexp *r);
/**
* Test whether a given string matches a compiled regular
* expression.
*
* @param r Compiled regular expression.
* @param string String to match against the regular expression.
* @return 0 if the string matches, a negative error code
* otherwise. GIT_ENOTFOUND if no match was found,
* GIT_EINVALIDSPEC if the regular expression matching
* was invalid.
*/
int git_regexp_match(const git_regexp *r, const char *string);
/**
* Search for matches inside of a given string.
*
* Given a regular expression with capturing groups, this
* function will populate provided @git_regmatch structures with
* offsets for each of the given matches. Non-matching groups
* will have start and end values of the respective @git_regmatch
* structure set to -1.
*
* @param r Compiled regular expression.
* @param string String to match against the regular expression.
* @param nmatches Number of @git_regmatch structures provided by
* the user.
* @param matches Pointer to an array of @git_regmatch structures.
* @return 0 if the string matches, a negative error code
* otherwise. GIT_ENOTFOUND if no match was found,
* GIT_EINVALIDSPEC if the regular expression matching
* was invalid.
*/
int git_regexp_search(const git_regexp *r, const char *string, size_t nmatches, git_regmatch *matches);
#endif
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