62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* $Id: rex.h,v 1.11 2006-08-10 16:02:15 bacon Exp $
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**/
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#ifndef _XP_AWK_REX_H_
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#define _XP_AWK_REX_H_
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#include <xp/types.h>
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#include <xp/macros.h>
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/*
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* Regular Expression 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 XP_AWK_REX_NA(code) (*(xp_size_t*)(code))
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#define XP_AWK_REX_LEN(code) \
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(*(xp_size_t*)((xp_byte_t*)(code)+xp_sizeof(xp_size_t)))
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#ifdef __cplusplus
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extern "C" {
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#endif
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void* xp_awk_buildrex (const xp_char_t* ptn, xp_size_t len, int* errnum);
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int xp_awk_matchrex (void* code,
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const xp_char_t* str, xp_size_t len,
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const xp_char_t** match_ptr, xp_size_t* match_len, int* errnum);
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void xp_awk_printrex (void* code);
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#ifdef __cplusplus
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}
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#endif
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#endif
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