qse/ase/awk/rex.h

76 lines
2.0 KiB
C

/*
* $Id: rex.h,v 1.24 2006-11-29 02:54:16 bacon Exp $
**/
#ifndef _ASE_AWK_REX_H_
#define _ASE_AWK_REX_H_
#include <ase/types.h>
#include <ase/macros.h>
/*
* Regular Esseression 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 ASE_AWK_REX_NA(code) (*(ase_size_t*)(code))
#define ASE_AWK_REX_LEN(code) \
(*(ase_size_t*)((ase_byte_t*)(code)+ASE_SIZEOF(ase_size_t)))
enum ase_awk_rex_opt_t
{
ASE_AWK_REX_IGNORECASE = (1 << 0)
};
#ifdef __cplusplus
extern "C" {
#endif
void* ase_awk_buildrex (
ase_awk_t* awk, const ase_char_t* ptn,
ase_size_t len, int* errnum);
int ase_awk_matchrex (
ase_awk_t* awk, void* code, int option,
const ase_char_t* str, ase_size_t len,
const ase_char_t** match_ptr, ase_size_t* match_len, int* errnum);
void ase_awk_freerex (ase_awk_t* awk, void* code);
ase_bool_t ase_awk_isemptyrex (ase_awk_t* awk, void* code);
#ifdef DEBUG_REX
void ase_awk_printrex (void* rex);
#endif
#ifdef __cplusplus
}
#endif
#endif