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#ifndef REGEXP_H
#define REGEXP_H
#include <regex.h>
#include <stdbool.h>
#include <stddef.h>
#include "util/macros.h"
enum {
#ifdef REG_ENHANCED
// The REG_ENHANCED flag enables various extensions on macOS
// (see "enhanced features" in re_format(7)). Most of these
// extensions are enabled by default on Linux (in both glibc
// and musl) without the need for any extra flags.
DEFAULT_REGEX_FLAGS = REG_EXTENDED | REG_ENHANCED,
#else
// POSIX Extended Regular Expressions (ERE) are used almost
// everywhere in this codebase, except where Basic Regular
// Expressions (BRE) are explicitly called for (most notably
// in search_tag(), which is used for ctags patterns).
DEFAULT_REGEX_FLAGS = REG_EXTENDED,
#endif
};
typedef struct {
regex_t re;
char str[];
} CachedRegexp;
typedef struct {
char *str;
regex_t re;
} InternedRegexp;
// Platform-specific patterns for matching word boundaries, as detected
// and initialized by regexp_init_word_boundary_tokens()
typedef struct {
char start[8];
char end[8];
} RegexpWordBoundaryTokens;
bool regexp_compile_internal(regex_t *re, const char *pattern, int flags) WARN_UNUSED_RESULT;
WARN_UNUSED_RESULT
static inline bool regexp_compile(regex_t *re, const char *pattern, int flags)
{
return regexp_compile_internal(re, pattern, flags | DEFAULT_REGEX_FLAGS);
}
WARN_UNUSED_RESULT
static inline bool regexp_compile_basic(regex_t *re, const char *pattern, int flags)
{
return regexp_compile_internal(re, pattern, flags);
}
WARN_UNUSED_RESULT
static inline bool regexp_is_valid(const char *pattern, int flags)
{
regex_t re;
if (!regexp_compile(&re, pattern, flags | REG_NOSUB)) {
return false;
}
regfree(&re);
return true;
}
void regexp_compile_or_fatal_error(regex_t *re, const char *pattern, int flags);
bool regexp_init_word_boundary_tokens(RegexpWordBoundaryTokens *rwbt);
bool regexp_error_msg(const regex_t *re, const char *pattern, int err);
void free_cached_regexp(CachedRegexp *cr);
const InternedRegexp *regexp_intern(const char *pattern);
bool regexp_is_interned(const char *pattern);
void free_interned_regexps(void);
bool regexp_exec (
const regex_t *re,
const char *buf,
size_t size,
size_t nmatch,
regmatch_t *pmatch,
int flags
) WARN_UNUSED_RESULT;
#endif
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