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// Copyright © Tavian Barnes <tavianator@tavianator.com> and the bfs contributors
// SPDX-License-Identifier: 0BSD
#ifndef BFS_XREGEX_H
#define BFS_XREGEX_H
/**
* A compiled regular expression.
*/
struct bfs_regex;
/**
* Regex syntax flavors.
*/
enum bfs_regex_type {
BFS_REGEX_POSIX_BASIC,
BFS_REGEX_POSIX_EXTENDED,
BFS_REGEX_EMACS,
BFS_REGEX_GREP,
};
/**
* Regex compilation flags.
*/
enum bfs_regcomp_flags {
/** Treat the regex case-insensitively. */
BFS_REGEX_ICASE = 1 << 0,
};
/**
* Regex execution flags.
*/
enum bfs_regexec_flags {
/** Only treat matches of the entire string as successful. */
BFS_REGEX_ANCHOR = 1 << 0,
};
/**
* Wrapper for regcomp() that supports additional regex types.
*
* @param[out] preg
* Will hold the compiled regex.
* @param pattern
* The regular expression to compile.
* @param type
* The regular expression syntax to use.
* @param flags
* Regex compilation flags.
* @return
* 0 on success, -1 on failure.
*/
int bfs_regcomp(struct bfs_regex **preg, const char *pattern, enum bfs_regex_type type, enum bfs_regcomp_flags flags);
/**
* Wrapper for regexec().
*
* @param regex
* The regular expression to execute.
* @param str
* The string to match against.
* @param flags
* Regex execution flags.
* @return
* 1 for a match, 0 for no match, -1 on failure.
*/
int bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags flags);
/**
* Free a compiled regex.
*/
void bfs_regfree(struct bfs_regex *regex);
/**
* Get a human-readable regex error message.
*
* @param regex
* The compiled regex.
* @return
* A human-readable description of the error, which should be free()'d.
*/
char *bfs_regerror(const struct bfs_regex *regex);
#endif // BFS_XREGEX_H
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