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/*
* Copyright (C) 2016-2023 Apple Inc. All rights reserved.
* Copyright (C) 2024 Samuel Weinig <sam@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CSSPropertyParserConsumer+ScrollSnap.h"
#include "CSSCalcSymbolTable.h"
#include "CSSParserContext.h"
#include "CSSParserTokenRange.h"
#include "CSSPropertyParserConsumer+Ident.h"
#include "CSSValueList.h"
namespace WebCore {
namespace CSSPropertyParserHelpers {
RefPtr<CSSValue> consumeScrollSnapAlign(CSSParserTokenRange& range, const CSSParserContext&)
{
// <'scroll-snap-align'> = [ none | start | end | center ]{1,2}
// https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align
auto firstValue = consumeIdent<CSSValueNone, CSSValueStart, CSSValueCenter, CSSValueEnd>(range);
if (!firstValue)
return nullptr;
auto secondValue = consumeIdent<CSSValueNone, CSSValueStart, CSSValueCenter, CSSValueEnd>(range);
bool shouldAddSecondValue = secondValue && !secondValue->equals(*firstValue);
// Only add the second value if it differs from the first so that we produce the canonical
// serialization of this CSSValueList.
if (shouldAddSecondValue)
return CSSValueList::createSpaceSeparated(firstValue.releaseNonNull(), secondValue.releaseNonNull());
return CSSValueList::createSpaceSeparated(firstValue.releaseNonNull());
}
RefPtr<CSSValue> consumeScrollSnapType(CSSParserTokenRange& range, const CSSParserContext&)
{
// <'scroll-snap-type'> = none | [ x | y | block | inline | both ] [ mandatory | proximity ]?
// https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type
auto firstValue = consumeIdent<CSSValueNone, CSSValueX, CSSValueY, CSSValueBlock, CSSValueInline, CSSValueBoth>(range);
if (!firstValue)
return nullptr;
// We only add the second value if it is not the initial value as described in specification
// so that serialization of this CSSValueList produces the canonical serialization.
auto secondValue = consumeIdent<CSSValueProximity, CSSValueMandatory>(range);
if (secondValue && secondValue->valueID() != CSSValueProximity)
return CSSValueList::createSpaceSeparated(firstValue.releaseNonNull(), secondValue.releaseNonNull());
return CSSValueList::createSpaceSeparated(firstValue.releaseNonNull());
}
} // namespace CSSPropertyParserHelpers
} // namespace WebCore
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