ap_regex.h revision ac45a43afbf38aa4a91c1402c6beef6ef8a2696d
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/* Derived from PCRE's pcreposix.h.
Copyright (c) 1997-2004 University of Cambridge
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/**
* @file ap_regex.h
* @brief Apache Regex defines
*/
#ifndef AP_REGEX_H
#define AP_REGEX_H
#include "apr.h"
/* Allow for C++ users */
#ifdef __cplusplus
extern "C" {
#endif
/* Options for ap_regcomp, ap_regexec, and ap_rxplus versions: */
#define AP_REG_ICASE 0x01 /** use a case-insensitive match */
#define AP_REG_NEWLINE 0x02 /** don't match newlines against '.' etc */
#define AP_REG_NOTBOL 0x04 /** ^ will not match against start-of-string */
#define AP_REG_NOTEOL 0x08 /** $ will not match against end-of-string */
#define AP_REG_EXTENDED (0) /** unused */
#define AP_REG_NOSUB (0) /** unused */
#define AP_REG_MULTI 0x10 /* perl's /g (needs fixing) */
#define AP_REG_NOMEM 0x20 /* nomem in our code */
#define AP_REG_DOTALL 0x40 /* perl's /s flag */
/* Error values: */
enum {
AP_REG_ASSERT = 1, /** internal error ? */
AP_REG_ESPACE, /** failed to get memory */
AP_REG_INVARG, /** invalid argument */
AP_REG_NOMATCH /** match failed */
};
/* The structure representing a compiled regular expression. */
typedef struct {
void *re_pcre;
apr_size_t re_nsub;
apr_size_t re_erroffset;
} ap_regex_t;
/* The structure in which a captured offset is returned. */
typedef struct {
int rm_so;
int rm_eo;
} ap_regmatch_t;
/* The functions */
/**
* Compile a regular expression.
* @param preg Returned compiled regex
* @param regex The regular expression string
* @param cflags Bitwise OR of AP_REG_* flags (ICASE and NEWLINE supported,
* other flags are ignored)
* @return Zero on success or non-zero on error
*/
AP_DECLARE(int) ap_regcomp(ap_regex_t *preg, const char *regex, int cflags);
/**
* Match a NUL-terminated string against a pre-compiled regex.
* @param preg The pre-compiled regex
* @param string The string to match
* @param nmatch Provide information regarding the location of any matches
* @param pmatch Provide information regarding the location of any matches
* @param eflags Bitwise OR of AP_REG_* flags (NOTBOL and NOTEOL supported,
* other flags are ignored)
* @return 0 for successful match, \p AP_REG_NOMATCH otherwise
*/
AP_DECLARE(int) ap_regexec(const ap_regex_t *preg, const char *string,
apr_size_t nmatch, ap_regmatch_t *pmatch, int eflags);
/**
* Return the error code returned by regcomp or regexec into error messages
* @param errcode the error code returned by regexec or regcomp
* @param preg The precompiled regex
* @param errbuf A buffer to store the error in
* @param errbuf_size The size of the buffer
*/
AP_DECLARE(apr_size_t) ap_regerror(int errcode, const ap_regex_t *preg,
char *errbuf, apr_size_t errbuf_size);
/** Destroy a pre-compiled regex.
* @param preg The pre-compiled regex to free.
*/
AP_DECLARE(void) ap_regfree(ap_regex_t *preg);
/* ap_rxplus: higher-level regexps */
typedef struct {
ap_regex_t rx;
apr_uint32_t flags;
const char *subs;
const char *match;
apr_size_t nmatch;
ap_regmatch_t *pmatch;
} ap_rxplus_t;
/**
* Compile a pattern into a regexp.
* supports perl-like formats
* match-string
* /match-string/flags
* s/match-string/replacement-string/flags
* Intended to support more perl-like stuff as and when round tuits happen
* match-string is anything supported by ap_regcomp
* replacement-string is a substitution string as supported in ap_pregsub
* flags should correspond with perl syntax: treat failure to do so as a bug
* (documentation TBD)
* @param pool Pool to allocate from
* @param pattern Pattern to compile
* @return Compiled regexp, or NULL in case of compile/syntax error
*/
AP_DECLARE(ap_rxplus_t*) ap_rxplus_compile(apr_pool_t *pool, const char *pattern);
/**
* Apply a regexp operation to a string.
* @param pool Pool to allocate from
* @param rx The regex match to apply
* @param pattern The string to apply it to
* NOTE: This MUST be kept in scope to use regexp memory
* @param newpattern The modified string (ignored if the operation doesn't
* modify the string)
* @return Number of times a match happens. Normally 0 (no match) or 1
* (match found), but may be greater if a transforming pattern
* is applied with the 'g' flag.
*/
AP_DECLARE(int) ap_rxplus_exec(apr_pool_t *pool, ap_rxplus_t *rx,
const char *pattern, char **newpattern);
#ifdef DOXYGEN
/**
* Number of matches in the regexp operation's memory
* This may be 0 if no match is in memory, or up to nmatch from compilation
* @param rx The regexp
* @return Number of matches in memory
*/
AP_DECLARE(int) ap_rxplus_nmatch(ap_rxplus_t *rx);
#else
#define ap_rxplus_nmatch(rx) (((rx)->match != NULL) ? (rx)->nmatch : 0)
#endif
/**
* Get a pointer to a match from regex memory
* NOTE: this relies on the match pattern from the last call to
* ap_rxplus_exec still being valid (i.e. not freed or out-of-scope)
* @param rx The regexp
* @param n The match number to retrieve (must be between 0 and nmatch)
* @param len Returns the length of the match.
* @param match Returns the match pattern
*/
AP_DECLARE(void) ap_rxplus_match(ap_rxplus_t *rx, int n, int *len,
const char **match);
/**
* Get a match from regex memory in a string copy
* NOTE: this relies on the match pattern from the last call to
* ap_rxplus_exec still being valid (i.e. not freed or out-of-scope)
* @param pool Pool to allocate from
* @param rx The regexp
* @param n The match number to retrieve (must be between 0 and nmatch)
* @return The matched string
*/
AP_DECLARE(char*) ap_rxplus_pmatch(apr_pool_t *pool, ap_rxplus_t *rx, int n);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* AP_REGEX_T */