RegExpRunStatus
RegExpShared::execute(JSContext *cx, const jschar *chars, size_t length, size_t *lastIndex,
MatchPairs **output)
{
const size_t origLength = length;
size_t backingPairCount = RegExpCode::getOutputSize(pairCount());
LifoAlloc &alloc = cx->tempLifoAlloc();
MatchPairs *matchPairs = MatchPairs::create(alloc, pairCount(), backingPairCount);
if (!matchPairs)
return RegExpRunStatus_Error;
/*
* |displacement| emulates sticky mode by matching from this offset
* into the char buffer and subtracting the delta off at the end.
*/
size_t start = *lastIndex;
size_t displacement = 0;
if (sticky()) {
displacement = *lastIndex;
chars += displacement;
length -= displacement;
start = 0;
}
RegExpRunStatus status = code.execute(cx, chars, length, start,
matchPairs->buffer(), backingPairCount);
switch (status) {
case RegExpRunStatus_Error:
return status;
case RegExpRunStatus_Success_NotFound:
*output = matchPairs;
return status;
default:
JS_ASSERT(status == RegExpRunStatus_Success);
}
matchPairs->displace(displacement);
matchPairs->checkAgainst(origLength);
*lastIndex = matchPairs->pair(0).limit;
*output = matchPairs;
return RegExpRunStatus_Success;
}
