regex.h

从一个开源软件中摘取的正则表达式模块

#ifndef _REGEX_H_
#define _REGEX_H_				/* never again */
/*
 * regular expressions
 *
 * Copyright (c) 1998, 1999 Henry Spencer.	All rights reserved.
 *
 * Development of this software was funded, in part, by Cray Research Inc.,
 * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
 * Corporation, none of whom are responsible for the results.  The author
 * thanks all of them.
 *
 * Redistribution and use in source and binary forms -- with or without
 * modification -- are permitted for any purpose, provided that
 * redistributions in source form retain this entire copyright notice and
 * indicate the origin and nature of any modifications.
 *
 * I'd appreciate being given credit for this package in the documentation
 * of software which uses it, but that is not a requirement.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $PostgreSQL: pgsql/src/include/regex/regex.h,v 1.29 2008/01/03 20:47:55 tgl Exp $
 */

/*
 * Add your own defines, if needed, here.
 */
#include "pg_wchar.h"

/*
 * interface types etc.
 */

/*
 * regoff_t has to be large enough to hold either off_t or ssize_t,
 * and must be signed; it's only a guess that long is suitable.
 */
typedef long regoff_t;

/*
 * other interface types
 */

/* the biggie, a compiled RE (or rather, a front end to same) */
typedef struct
{
	int		re_magic;		/* magic number */
	size_t		re_nsub;		/* number of subexpressions */
	long		re_info;		/* information about RE */
#define  REG_UBACKREF		 000001
#define  REG_ULOOKAHEAD		 000002
#define  REG_UBOUNDS	 000004
#define  REG_UBRACES	 000010
#define  REG_UBSALNUM		 000020
#define  REG_UPBOTCH	 000040
#define  REG_UBBS		 000100
#define  REG_UNONPOSIX		 000200
#define  REG_UUNSPEC	 000400
#define  REG_UUNPORT	 001000
#define  REG_ULOCALE	 002000
#define  REG_UEMPTYMATCH	 004000
#define  REG_UIMPOSSIBLE	 010000
#define  REG_USHORTEST		 020000
	int			re_csize;		/* sizeof(character)字符的长度 */
	char	   *re_endp;		/* backward compatibility kludge  */
	/* the rest is opaque pointers to hidden innards */
	char	   *re_guts;		/* `char *' is more portable than `void *'  这个是最关键的内容*/
	char	   *re_fns;
} regex_t;

/* result reporting (may acquire more fields later) 标记匹配前后位置的结构 */
typedef struct
{
	regoff_t	rm_so;			/* start of substring */
	regoff_t	rm_eo;			/* end of substring */
} regmatch_t;

/* supplementary control and reporting 匹配细节*/
typedef struct
{
	regmatch_t	rm_extend;		/* see REG_EXPECT */
} rm_detail_t;



/*
 * regex compilation flags 编译标记
 */
#define REG_BASIC	000000		/* BREs (convenience) Basic Regular expression 基本正则表达式*/
#define REG_EXTENDED	000001		/* EREs Externed Regular expression 扩展正则表达式*/
#define REG_ADVF	000002		/* advanced features in EREs 。EREs 的高级特征*/	
#define REG_ADVANCED	000003		/* AREs (which are also EREs) 。EREs*/
#define REG_QUOTE	000004		/* no special characters, none 。没有特殊字符*/
#define REG_NOSPEC	REG_QUOTE	/* historical synonym ,和 REG_QUOTE一样*/

#define REG_ICASE	000010		/* ignore case ,忽略大小写*/
#define REG_NOSUB	000020		/* don't care about subexpressions ，不关心子表达式*/
#define REG_EXPANDED	000040		/* expanded format, white space & comments */

#define REG_NLSTOP	000100		/* \n doesn't match . or [^ ] */
#define REG_NLANCH	000200		/* ^ matches after \n, $ before */
#define REG_NEWLINE 	000300		/* newlines are line terminators */
#define REG_PEND	000400		/* ugh -- backward-compatibility hack */

#define REG_EXPECT	001000		/* report details on partial/limited matches */
#define REG_BOSONLY 	002000		/* temporary kludge for BOS-only matches */
#define REG_DUMP	004000		/* none of your business :-) */

#define REG_FAKE	010000		/* none of your business :-) */
#define REG_PROGRESS	020000		/* none of your business :-) */



/*
 * regex execution flags 执行标记
 */
#define REG_NOTBOL	0001		/* BOS is not BOL */
#define REG_NOTEOL	0002		/* EOS is not EOL */
#define REG_STARTEND	0004	/* backward compatibility kludge */

#define REG_FTRACE	0010		/* none of your business */
#define REG_MTRACE	0020		/* none of your business */
#define REG_SMALL	0040		/* none of your business */


/*
 * error reporting错误报告，表示匹配返回结果
 * Be careful if modifying the list of error codes -- the table used by
 * regerror() is generated automatically from this file!
 */
#define REG_OKAY	 0			/* no errors detected */
#define REG_NOMATCH  1			/* failed to match */
#define REG_BADPAT	 2			/* invalid regexp */
#define REG_ECOLLATE	 3		/* invalid collating element */
#define REG_ECTYPE	 4			/* invalid character class */
#define REG_EESCAPE	 5			/* invalid escape \ sequence */
#define REG_ESUBREG	 6		/* invalid backreference number */
#define REG_EBRACK	 7			/* brackets [] not balanced */
#define REG_EPAREN	 8			/* parentheses () not balanced */
#define REG_EBRACE	 9			/* braces {} not balanced */
#define REG_BADBR	10			/* invalid repetition count(s) */
#define REG_ERANGE	11			/* invalid character range */
#define REG_ESPACE	12			/* out of memory */
#define REG_BADRPT	13			/* quantifier operand invalid */
#define REG_ASSERT	15			/* "can't happen" -- you found a bug */
#define REG_INVARG	16			/* invalid argument to regex function */
#define REG_MIXED	17			/* character widths of regex and string differ */
#define REG_BADOPT	18			/* invalid embedded option */
#define REG_ETOOBIG	19			/* nfa has too many states */
/* two specials for debugging and testing */
#define REG_ATOI	101			/* convert error-code name to number */
#define REG_ITOA	102			/* convert error-code number to name */



/*
 * the prototypes for exported functions
 */
extern int	pg_regcomp(regex_t *, const pg_wchar *, size_t, int); /*编译正则表达式字符串compile*/
extern int	pg_regexec(regex_t *, const pg_wchar *, size_t, size_t, rm_detail_t *, size_t, regmatch_t[], int); /*执行*/
extern void pg_regfree(regex_t *); /*释放内存*/
extern size_t pg_regerror(int, const regex_t *, char *, size_t); /*错误报告*/


/*
 *包装后的函数(regexp.c文件包装)
 *默认字符转换编码使用utf-8,正则表达式选项是REG_ADVANCED,不返回细节的匹配信息。
 * */
extern bool pg_regex_match(const char * data,const char *re_val );
extern bool pg_regex_match_icase(const char * data,const char *re_val ); /*大小写无关*/
extern bool similar_to(const char * data,const char * re_val,const char * escape); //SQL-99的正则表达式
extern char *text_regex_substr(const char * data,const char * re_val); /*根据正则表达式取子字符串，此函数动态分配内存，一定要用free 释放返回值。*/
extern char * text_regex_replace(const char * s,const char * p,const char * r);  //字符串的替换,此函数动态分配内存，一定要用free 释放返回值。




#endif   /* _REGEX_H_ */