static PassRefPtrWillBeRawPtr<CSSValueList> parseSimpleTransformList(CharType*& pos, CharType* end)
{
RefPtrWillBeRawPtr<CSSValueList> transformList = nullptr;
while (pos < end) {
while (pos < end && isCSSSpace(*pos))
++pos;
RefPtrWillBeRawPtr<CSSFunctionValue> transformValue = parseSimpleTransformValue(pos, end);
if (!transformValue)
return nullptr;
if (!transformList)
transformList = CSSValueList::createSpaceSeparated();
transformList->append(transformValue.release());
if (pos < end) {
if (isCSSSpace(*pos))
return nullptr;
}
}
return transformList.release();
}
static bool transformCanLikelyUseFastPath(const CharType* chars,
unsigned length) {
// Very fast scan that attempts to reject most transforms that couldn't
// take the fast path. This avoids doing the malloc and string->double
// conversions in parseSimpleTransformValue only to discard them when we
// run into a transform component we don't understand.
unsigned i = 0;
while (i < length) {
if (isCSSSpace(chars[i])) {
++i;
continue;
}
if (length - i < kShortestValidTransformStringLength)
return false;
switch (toASCIILower(chars[i])) {
case 't':
// translate, translateX, translateY, translateZ, translate3d.
if (toASCIILower(chars[i + 8]) != 'e')
return false;
i += 9;
break;
case 'm':
// matrix3d.
if (toASCIILower(chars[i + 7]) != 'd')
return false;
i += 8;
break;
case 's':
// scale3d.
if (toASCIILower(chars[i + 6]) != 'd')
return false;
i += 7;
break;
default:
// All other things, ex. rotate.
return false;
}
size_t argumentsEnd = WTF::find(chars, length, ')', i);
if (argumentsEnd == kNotFound)
return false;
// Advance to the end of the arguments.
i = argumentsEnd + 1;
}
return i == length;
}
static CSSValueList* parseSimpleTransformList(const CharType* chars,
unsigned length) {
if (!transformCanLikelyUseFastPath(chars, length))
return nullptr;
const CharType*& pos = chars;
const CharType* end = chars + length;
CSSValueList* transformList = nullptr;
while (pos < end) {
while (pos < end && isCSSSpace(*pos))
++pos;
if (pos >= end)
break;
CSSFunctionValue* transformValue = parseSimpleTransformValue(pos, end);
if (!transformValue)
return nullptr;
if (!transformList)
transformList = CSSValueList::createSpaceSeparated();
transformList->append(*transformValue);
}
return transformList;
}
