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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/css/properties/CSSPropertyAPIWillChange.h"
#include "core/css/CSSValueList.h"
#include "core/css/parser/CSSParserTokenRange.h"
#include "core/css/parser/CSSPropertyParser.h"
#include "core/css/parser/CSSPropertyParserHelpers.h"
namespace blink {
const CSSValue* CSSPropertyAPIWillChange::parseSingleValue(
CSSParserTokenRange& range,
const CSSParserContext* context) {
if (range.peek().id() == CSSValueAuto)
return CSSPropertyParserHelpers::consumeIdent(range);
CSSValueList* values = CSSValueList::createCommaSeparated();
// Every comma-separated list of identifiers is a valid will-change value,
// unless the list includes an explicitly disallowed identifier.
while (true) {
if (range.peek().type() != IdentToken)
return nullptr;
CSSPropertyID unresolvedProperty =
unresolvedCSSPropertyID(range.peek().value());
if (unresolvedProperty != CSSPropertyInvalid &&
unresolvedProperty != CSSPropertyVariable) {
DCHECK(CSSPropertyMetadata::isEnabledProperty(unresolvedProperty));
// Now "all" is used by both CSSValue and CSSPropertyValue.
// Need to return nullptr when currentValue is CSSPropertyAll.
if (unresolvedProperty == CSSPropertyWillChange ||
unresolvedProperty == CSSPropertyAll)
return nullptr;
values->append(*CSSCustomIdentValue::create(unresolvedProperty));
range.consumeIncludingWhitespace();
} else {
switch (range.peek().id()) {
case CSSValueNone:
case CSSValueAll:
case CSSValueAuto:
case CSSValueDefault:
case CSSValueInitial:
case CSSValueInherit:
return nullptr;
case CSSValueContents:
case CSSValueScrollPosition:
values->append(*CSSPropertyParserHelpers::consumeIdent(range));
break;
default:
range.consumeIncludingWhitespace();
break;
}
}
if (range.atEnd())
break;
if (!CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(range))
return nullptr;
}
return values;
}
} // namespace blink
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