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enhanced xmlFARegExec range evaluation for min occurs 0 problems - fixes

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* xmlregexp.c: enhanced xmlFARegExec range evaluation for min
  occurs 0 problems - fixes bug 140478.
This commit is contained in:
William M. Brack
2004-04-26 15:40:47 +00:00
parent f762755fd7
commit 0e00b28db6
2 changed files with 36 additions and 5 deletions
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36
xmlregexp.c
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@ -2235,12 +2235,24 @@ xmlFARegExec(xmlRegexpPtr comp, const xmlChar *content) {
xmlRegAtomPtr atom;
/*
* End of input on non-terminal state, rollback, however we may
* If end of input on non-terminal state, rollback, however we may
* still have epsilon like transition for counted transitions
* on counters, in that case don't break too early.
* on counters, in that case don't break too early. Additionally,
* if we are working on a range like "AB{0,2}", where B is not present,
* we don't want to break.
*/
if ((exec->inputString[exec->index] == 0) && (exec->counts == NULL))
goto rollback;
if ((exec->inputString[exec->index] == 0) && (exec->counts == NULL)) {
/* must check if atom allows minOccurs of 0 */
if (exec->transno < exec->state->nbTrans) { /* there is a transition */
trans = &exec->state->trans[exec->transno];
if (trans->to >=0) {
atom = trans->atom;
if (!((atom->min == 0) && (atom->max > 0)))
goto rollback;
}
} else
goto rollback;
}
exec->transcount = 0;
for (;exec->transno < exec->state->nbTrans;exec->transno++) {
@ -2271,7 +2283,7 @@ xmlFARegExec(xmlRegexpPtr comp, const xmlChar *content) {
} else if (exec->inputString[exec->index] != 0) {
codepoint = CUR_SCHAR(&(exec->inputString[exec->index]), len);
ret = xmlRegCheckCharacter(atom, codepoint);
if ((ret == 1) && (atom->min > 0) && (atom->max > 0)) {
if ((ret == 1) && (atom->min >= 0) && (atom->max > 0)) {
xmlRegStatePtr to = comp->states[trans->to];
/*
@ -2326,7 +2338,21 @@ xmlFARegExec(xmlRegexpPtr comp, const xmlChar *content) {
if (ret == 0) {
goto rollback;
}
} else if ((ret == 0) && (atom->min == 0) && (atom->max > 0)) {
/*
* we don't match on the codepoint, but minOccurs of 0
* says that's ok. Setting len to 0 inhibits stepping
* over the codepoint.
*/
exec->transcount = 1;
len = 0;
ret = 1;
}
} else if ((atom->min == 0) && (atom->max > 0)) {
/* another spot to match when minOccurs is 0 */
exec->transcount = 1;
len = 0;
ret = 1;
}
if (ret == 1) {
if (exec->state->nbTrans > exec->transno + 1) {