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applied patch from Youri Golovanov fixing bug #316338 and adding a couple

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* xmlregexp.c: applied patch from Youri Golovanov fixing bug
  #316338 and adding a couple of optimizations in the regexp
  compilation engine.
* test/regexp/bug316338 result/regexp/bug316338: added regression
  tests based on the examples provided in the bug report.
Daniel
This commit is contained in:
Daniel Veillard
2006-03-21 23:17:57 +00:00
parent aac7c68e87
commit 54eb0243c4
4 changed files with 82 additions and 18 deletions
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52
xmlregexp.c
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@ -1479,7 +1479,13 @@ xmlFAGenerateTransitions(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr from,
switch (atom->quant) {
case XML_REGEXP_QUANT_OPT:
atom->quant = XML_REGEXP_QUANT_ONCE;
xmlFAGenerateEpsilonTransition(ctxt, atom->start, atom->stop);
/*
* transition done to the state after end of atom.
* 1. set transition from atom start to new state
* 2. set transition from atom end to this state.
*/
xmlFAGenerateEpsilonTransition(ctxt, atom->start, 0);
xmlFAGenerateEpsilonTransition(ctxt, atom->stop, ctxt->state);
break;
case XML_REGEXP_QUANT_MULT:
atom->quant = XML_REGEXP_QUANT_ONCE;
@ -1522,8 +1528,6 @@ xmlFAGenerateTransitions(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr from,
atom->min = 0;
atom->max = 0;
atom->quant = XML_REGEXP_QUANT_ONCE;
xmlFAGenerateCountedEpsilonTransition(ctxt, atom->stop,
atom->start, counter);
if (to != NULL) {
newstate = to;
} else {
@ -1533,6 +1537,13 @@ xmlFAGenerateTransitions(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr from,
ctxt->state = newstate;
xmlFAGenerateCountedTransition(ctxt, atom->stop,
newstate, counter);
/*
* first check count and if OK jump forward;
* if checking fail increment count and jump back
*/
xmlFAGenerateCountedEpsilonTransition(ctxt, atom->stop,
atom->start, counter);
}
default:
break;
@ -4299,6 +4310,15 @@ xmlRegExecPushChar(xmlRegExecCtxtPtr exec, int UCS) {
if (exec->state->nbTrans > exec->transno + 1) {
xmlFARegExecSave(exec);
}
/*
* restart count for expressions like this ((abc){2})*
*/
if (trans->count >= 0) {
#ifdef DEBUG_REGEXP_EXEC
printf("Reset count %d\n", trans->count);
#endif
exec->counts[trans->count] = 0;
}
if (trans->counter >= 0) {
#ifdef DEBUG_REGEXP_EXEC
printf("Increasing count %d\n", trans->counter);
@ -5112,19 +5132,23 @@ xmlFAParsePiece(xmlRegParserCtxtPtr ctxt) {
/**
* xmlFAParseBranch:
* @ctxt: a regexp parser context
* @to: optional target to the end of the branch
*
* @to is used to optimize by removing duplicate path in automata
* in expressions like (a|b)(c|d)
*
* [2] branch ::= piece*
8
*/
static int
xmlFAParseBranch(xmlRegParserCtxtPtr ctxt) {
xmlFAParseBranch(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr to) {
xmlRegStatePtr previous;
int ret;
previous = ctxt->state;
ret = xmlFAParsePiece(ctxt);
if (ret != 0) {
if (xmlFAGenerateTransitions(ctxt, previous, NULL, ctxt->atom) < 0)
if (xmlFAGenerateTransitions(ctxt, previous,
(CUR=='|' || CUR==')') ? to : NULL, ctxt->atom) < 0)
return(-1);
previous = ctxt->state;
ctxt->atom = NULL;
@ -5132,8 +5156,8 @@ xmlFAParseBranch(xmlRegParserCtxtPtr ctxt) {
while ((ret != 0) && (ctxt->error == 0)) {
ret = xmlFAParsePiece(ctxt);
if (ret != 0) {
if (xmlFAGenerateTransitions(ctxt, previous, NULL,
ctxt->atom) < 0)
if (xmlFAGenerateTransitions(ctxt, previous,
(CUR=='|' || CUR==')') ? to : NULL, ctxt->atom) < 0)
return(-1);
previous = ctxt->state;
ctxt->atom = NULL;
@ -5156,7 +5180,7 @@ xmlFAParseRegExp(xmlRegParserCtxtPtr ctxt, int top) {
/* if not top start should have been generated by an epsilon trans */
start = ctxt->state;
ctxt->end = NULL;
xmlFAParseBranch(ctxt);
xmlFAParseBranch(ctxt, NULL);
if (top) {
#ifdef DEBUG_REGEXP_GRAPH
printf("State %d is final\n", ctxt->state->no);
@ -5172,15 +5196,7 @@ xmlFAParseRegExp(xmlRegParserCtxtPtr ctxt, int top) {
NEXT;
ctxt->state = start;
ctxt->end = NULL;
xmlFAParseBranch(ctxt);
if (top) {
ctxt->state->type = XML_REGEXP_FINAL_STATE;
#ifdef DEBUG_REGEXP_GRAPH
printf("State %d is final\n", ctxt->state->no);
#endif
} else {
xmlFAGenerateEpsilonTransition(ctxt, ctxt->state, end);
}
xmlFAParseBranch(ctxt, end);
}
if (!top) {
ctxt->state = end;