95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* $Id: rex.h 116 2008-03-03 11:15:37Z baconevi $
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*
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* {License}
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*/
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#ifndef _ASE_CMN_REX_H_
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#define _ASE_CMN_REX_H_
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#include <ase/cmn/types.h>
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#include <ase/cmn/macros.h>
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/*
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* Regular Esseression Syntax
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* A regular expression is zero or more branches, separated by '|'.
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* ......
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* ......
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*
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* Compiled form of a regular expression:
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*
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* | expression |
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* | header | branch | branch | branch |
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* | nb | el | na | bl | cmd | arg | cmd | arg | na | bl | cmd | arg | na | bl | cmd |
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*
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* nb: the number of branches
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* el: the length of a expression including the length of nb and el
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* na: the number of atoms
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* bl: the length of a branch including the length of na and bl
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* cmd: The command and repetition info encoded together.
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* Some commands require an argument to follow them but some other don't.
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* It is encoded as follows:
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*
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* Subexpressions can be nested by having the command "GROUP"
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* and a subexpression as its argument.
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*
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* Examples:
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* a.c -> |1|6|5|ORD_CHAR(no bound)|a|ANY_CHAR(no bound)|ORD_CHAR(no bound)|c|
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* 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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*/
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#define ASE_REX_NA(code) (*(ase_size_t*)(code))
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#define ASE_REX_LEN(code) \
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(*(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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{
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ASE_REX_IGNORECASE = (1 << 0)
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};
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enum ase_rex_errnum_t
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{
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ASE_REX_ENOERR = 0,
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ASE_REX_ENOMEM,
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ASE_REX_ERECUR, /* recursion too deep */
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ASE_REX_ERPAREN, /* a right parenthesis is expected */
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ASE_REX_ERBRACKET, /* a right bracket is expected */
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ASE_REX_ERBRACE, /* a right brace is expected */
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ASE_REX_EUNBALPAR, /* unbalanced parenthesis */
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ASE_REX_ECOLON, /* a colon is expected */
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ASE_REX_ECRANGE, /* invalid character range */
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ASE_REX_ECCLASS, /* invalid character class */
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ASE_REX_EBRANGE, /* invalid boundary range */
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ASE_REX_EEND, /* unexpected end of the pattern */
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ASE_REX_EGARBAGE /* garbage after the pattern */
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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void* ase_buildrex (
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ase_mmgr_t* mmgr, ase_size_t depth,
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const ase_char_t* ptn, ase_size_t len, int* errnum);
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int ase_matchrex (
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ase_mmgr_t* mmgr, ase_ccls_t* ccls, ase_size_t depth,
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void* code, int option,
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const ase_char_t* str, ase_size_t len,
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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
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void ase_dprintrex (ase_rex_t* rex, void* rex);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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