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/****************************************************************************
* bfs *
* Copyright (C) 2022 Tavian Barnes <tavianator@tavianator.com> and bfs *
* contributors *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
#ifndef BFS_REGEX_H
#define BFS_REGEX_H
#include <stdbool.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 expr
* The regular expression to compile.
* @param type
* The regular expression syntax to use.
* @param flags
* Regex compilation flags.
* @param[out] err
* Will hold the error code if compilation fails.
* @return
* The compiled regular expression, or NULL on error.
*/
struct bfs_regex *bfs_regcomp(const char *expr, enum bfs_regex_type type, enum bfs_regcomp_flags flags, int *err);
/**
* Wrapper for regexec().
*
* @param expr
* The regular expression to execute.
* @param str
* The string to match against.
* @param flags
* Regex execution flags.
* @param[out] err
* Will hold the error code if execution fails.
* @return
* Whether the regex matched.
*/
bool bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags flags, int *err);
/**
* Free a compiled regex.
*/
void bfs_regfree(struct bfs_regex *regex);
/**
* Dynamically allocate a regex error message.
*
* @param err
* The error code to stringify.
* @param regex
* The compiled regex, or NULL if compilation failed.
* @return
* A human-readable description of the error, allocated with malloc().
*/
char *bfs_regerror(int err, const struct bfs_regex *regex);
#endif // BFS_REGEX_H
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