qse/ase/awk/rex.h

74 lines
1.9 KiB
C

/*
* $Id: rex.h,v 1.18 2006-10-12 04:17:31 bacon Exp $
**/
#ifndef _XP_AWK_REX_H_
#define _XP_AWK_REX_H_
#include <xp/types.h>
#include <xp/macros.h>
/*
* Regular Expression Syntax
* A regular expression is zero or more branches, separated by '|'.
* ......
* ......
*
* Compiled form of a regular expression:
*
* | expression |
* | header | branch | branch | branch |
* | nb | el | na | bl | cmd | arg | cmd | arg | na | bl | cmd | arg | na | bl | cmd |
*
* nb: the number of branches
* el: the length of a expression including the length of nb and el
* na: the number of atoms
* bl: the length of a branch including the length of na and bl
* cmd: The command and repetition info encoded together.
* Some commands require an argument to follow them but some other don't.
* It is encoded as follows:
*
* Subexpressions can be nested by having the command "GROUP"
* and a subexpression as its argument.
*
* Examples:
* a.c -> |1|6|5|ORD_CHAR(no bound)|a|ANY_CHAR(no bound)|ORD_CHAR(no bound)|c|
* ab|xy -> |2|10|4|ORD_CHAR(no bound)|a|ORD_CHAR(no bound)|b|4|ORD_CHAR(no bound)|x|ORD_CHAR(no bound)|y|
*/
#define XP_AWK_REX_NA(code) (*(xp_size_t*)(code))
#define XP_AWK_REX_LEN(code) \
(*(xp_size_t*)((xp_byte_t*)(code)+xp_sizeof(xp_size_t)))
enum xp_awk_rex_option_t
{
XP_AWK_REX_IGNORECASE = (1 << 0)
};
#ifdef __cplusplus
extern "C" {
#endif
void* xp_awk_buildrex (
xp_awk_t* awk, const xp_char_t* ptn,
xp_size_t len, int* errnum);
int xp_awk_matchrex (
xp_awk_t* awk, void* code, int option,
const xp_char_t* str, xp_size_t len,
const xp_char_t** match_ptr, xp_size_t* match_len, int* errnum);
void xp_awk_freerex (xp_awk_t* awk, void* code);
xp_bool_t xp_awk_isemptyrex (xp_awk_t* awk, void* code);
void xp_awk_printrex (void* code);
#ifdef __cplusplus
}
#endif
#endif