qse/ase/cmn/rex.h

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/*
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* $Id: rex.h 116 2008-03-03 11:15:37Z baconevi $
*
* {License}
*/
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#ifndef _ASE_CMN_REX_H_
#define _ASE_CMN_REX_H_
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#include <ase/cmn/types.h>
#include <ase/cmn/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|
*/
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#define ASE_REX_NA(code) (*(ase_size_t*)(code))
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#define ASE_REX_LEN(code) \
(*(ase_size_t*)((ase_byte_t*)(code)+ASE_SIZEOF(ase_size_t)))
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enum ase_rex_option_t
{
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ASE_REX_IGNORECASE = (1 << 0)
};
enum ase_rex_errnum_t
{
ASE_REX_ENOERR = 0,
ASE_REX_ENOMEM,
ASE_REX_ERECUR, /* recursion too deep */
ASE_REX_ERPAREN, /* a right parenthesis is expected */
ASE_REX_ERBRACKET, /* a right bracket is expected */
ASE_REX_ERBRACE, /* a right brace is expected */
ASE_REX_EUNBALPAR, /* unbalanced parenthesis */
ASE_REX_ECOLON, /* a colon is expected */
ASE_REX_ECRANGE, /* invalid character range */
ASE_REX_ECCLASS, /* invalid character class */
ASE_REX_EBRANGE, /* invalid boundary range */
ASE_REX_EEND, /* unexpected end of the pattern */
ASE_REX_EGARBAGE /* garbage after the pattern */
};
#ifdef __cplusplus
extern "C" {
#endif
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void* ase_buildrex (
ase_mmgr_t* mmgr, ase_size_t depth,
const ase_char_t* ptn, ase_size_t len, int* errnum);
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int ase_matchrex (
ase_mmgr_t* mmgr, ase_ccls_t* ccls, ase_size_t depth,
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);
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void ase_freerex (ase_mmgr_t* mmgr, void* code);
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ase_bool_t ase_isemptyrex (void* code);
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#if 0
void ase_dprintrex (ase_rex_t* rex, void* rex);
#endif
#ifdef __cplusplus
}
#endif
#endif