Xerces 2.8.0 and 3.0.1: Bug in RegularExpression::matches(txt, pMatch)
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Key: XERCESC-1870
URL: https://issues.apache.org/jira/browse/XERCESC-1870
Project: Xerces-C++
Issue Type: Bug
Components: Utilities
Affects Versions: 2.8.0, 3.0.1
Environment: Platform Windows XP
MSVC 7.1, 8.0, 9.0
Reporter: mark hermann
Fix For: 2.7.0
RegularExpression::matches(txt, pMatch) does not work anymore in 2.8, 3.0.1
since pMatch is not updated correctly anymore.
// Test code - works with 2.7.0
XMLCh * txt = L"2004-06-17";
Match m;
RegularExpression
r("(\\-?\\d+(\\-\\d{2}(\\-\\d{2})?)?)?(T\\d{2}(:\\d{2}(:\\d{2}(:\\d+)?)?)?)?(F\\d+)?((\\-|\\+)\\d{2}:\\d{2})?");
if(r.matches(txt, &m))
{
for(int i = 1; i < m.getNoGroups(); i++)
{
int i1 = m.getStartPos(i); // Should be 0
int i2 = Mp7JrsUtil::GetNextEndPos(m, i); // Should be 4
if(i1 == i2) // Is -1
{
printf("This is wrong!\n");
return;
}
}
}
Problem can be tracked via
bool RegularExpression::matches(const XMLCh* const expression, const XMLSize_t
start
, const XMLSize_t end, Match* const pMatch
, MemoryManager* const manager) const;
which does
Match* lMatch = pMatch; // use our pMatch
context.fMatch = lMatch; // put pMatch into context
/*
* Straightforward matching
*/
for (matchStart=context.fStart; matchStart<=limit; matchStart++) {
if (0 <= (matchEnd = match(&context,fOperations,matchStart)))
break;
}
and at the end updates the context fMatch data
if (matchEnd >= 0) {
if (context.fMatch != 0) {
context.fMatch->setStartPos(0, (int)matchStart);
context.fMatch->setEndPos(0, matchEnd);
}
return true;
}
But: context.fMatch is NOT the original match pointer (pMatch), but a temporal
one.
So the correct result is not propagated back to the caller anymore.
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