2016-11-25 17:18:40 +01:00
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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2017-04-19 23:33:14 +02:00
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#include <lib9.h>
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2016-11-25 17:18:40 +01:00
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#include "regexp.h"
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#include "regcomp.h"
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/*
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* save a new match in mp
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*/
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extern void
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_renewmatch(Resub *mp, int ms, Resublist *sp)
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{
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int i;
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if(mp==0 || ms<=0)
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return;
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if(mp[0].sp==0 || sp->m[0].sp<mp[0].sp ||
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(sp->m[0].sp==mp[0].sp && sp->m[0].ep>mp[0].ep)){
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for(i=0; i<ms && i<NSUBEXP; i++)
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mp[i] = sp->m[i];
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for(; i<ms; i++)
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mp[i].sp = mp[i].ep = 0;
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}
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}
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/*
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* Note optimization in _renewthread:
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* *lp must be pending when _renewthread called; if *l has been looked
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* at already, the optimization is a bug.
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*/
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extern Relist*
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_renewthread(Relist *lp, /* _relist to add to */
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Reinst *ip, /* instruction to add */
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int ms,
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Resublist *sep) /* pointers to subexpressions */
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{
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Relist *p;
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for(p=lp; p->inst; p++){
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if(p->inst == ip){
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if(sep->m[0].sp < p->se.m[0].sp){
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if(ms > 1)
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p->se = *sep;
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else
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p->se.m[0] = sep->m[0];
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}
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return 0;
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}
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}
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p->inst = ip;
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if(ms > 1)
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p->se = *sep;
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else
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p->se.m[0] = sep->m[0];
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(++p)->inst = 0;
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return p;
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}
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/*
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* same as renewthread, but called with
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* initial empty start pointer.
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*/
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extern Relist*
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_renewemptythread(Relist *lp, /* _relist to add to */
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Reinst *ip, /* instruction to add */
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int ms,
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char *sp) /* pointers to subexpressions */
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{
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Relist *p;
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for(p=lp; p->inst; p++){
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if(p->inst == ip){
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if(sp < p->se.m[0].sp) {
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if(ms > 1)
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memset(&p->se, 0, sizeof(p->se));
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p->se.m[0].sp = sp;
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}
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return 0;
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}
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}
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p->inst = ip;
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if(ms > 1)
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memset(&p->se, 0, sizeof(p->se));
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p->se.m[0].sp = sp;
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(++p)->inst = 0;
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return p;
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}
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extern Relist*
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_rrenewemptythread(Relist *lp, /* _relist to add to */
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Reinst *ip, /* instruction to add */
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int ms,
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Rune *rsp) /* pointers to subexpressions */
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{
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Relist *p;
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for(p=lp; p->inst; p++){
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if(p->inst == ip){
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if(rsp < p->se.m[0].rsp) {
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if(ms > 1)
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memset(&p->se, 0, sizeof(p->se));
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p->se.m[0].rsp = rsp;
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}
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return 0;
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}
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}
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p->inst = ip;
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if(ms > 1)
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memset(&p->se, 0, sizeof(p->se));
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p->se.m[0].rsp = rsp;
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(++p)->inst = 0;
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return p;
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}
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