JSValue RegExpObject::matchGlobal(ExecState* exec, JSGlobalObject* globalObject, JSString* string)
{
RegExp* regExp = this->regExp();
ASSERT(regExp->global());
VM* vm = &globalObject->vm();
setLastIndex(exec, 0);
if (exec->hadException())
return jsUndefined();
String s = string->value(exec);
RegExpConstructor* regExpConstructor = globalObject->regExpConstructor();
MatchResult result = regExpConstructor->performMatch(*vm, regExp, string, s, 0);
// return array of matches
MarkedArgumentBuffer list;
// We defend ourselves from crazy.
const size_t maximumReasonableMatchSize = 1000000000;
if (regExp->unicode()) {
unsigned stringLength = s.length();
while (result) {
if (list.size() > maximumReasonableMatchSize) {
throwOutOfMemoryError(exec);
return jsUndefined();
}
size_t end = result.end;
size_t length = end - result.start;
list.append(jsSubstring(exec, s, result.start, length));
if (!length)
end = advanceStringUnicode(s, stringLength, end);
result = regExpConstructor->performMatch(*vm, regExp, string, s, end);
}
} else {
while (result) {
if (list.size() > maximumReasonableMatchSize) {
throwOutOfMemoryError(exec);
return jsUndefined();
}
size_t end = result.end;
size_t length = end - result.start;
list.append(jsSubstring(exec, s, result.start, length));
if (!length)
++end;
result = regExpConstructor->performMatch(*vm, regExp, string, s, end);
}
}
if (list.isEmpty()) {
// if there are no matches at all, it's important to return
// Null instead of an empty array, because this matches
// other browsers and because Null is a false value.
return jsNull();
}
return constructArray(exec, static_cast<ArrayAllocationProfile*>(0), list);
}
