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fixed bugs in rex and awk

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- fixed bugs of not parsing some forms of ranges such as {,m} {n,} properly
- fixed bugs in substitution functions that did not handle 0-length substring match properly.
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hyung-hwan
2009-06-18 06:43:50 +00:00
parent e774c0bbd1
commit 944a492c88
6 changed files with 223 additions and 69 deletions
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38
qse/include/qse/cmn/rex.h
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@ -1,5 +1,5 @@
/*
* $Id: rex.h 195 2009-06-10 13:18:25Z hyunghwan.chung $
* $Id: rex.h 203 2009-06-17 12:43:50Z hyunghwan.chung $
*
Copyright 2006-2009 Chung, Hyung-Hwan.
@ -22,7 +22,8 @@
#include <qse/types.h>
#include <qse/macros.h>
/*
/** @file
*
* Regular Esseression Syntax
* A regular expression is zero or more branches, separated by '|'.
* ......
@ -30,24 +31,29 @@
*
* 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 |
* | 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:
* - 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.
*
* Subexpressions can be nested by having the command "GROUP"
* and a subexpression as its argument.
* 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|
* 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|
*
* @todo
* - support \\n to refer to the nth matching substring
*/
#define QSE_REX_NA(code) (*(qse_size_t*)(code))