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/*
* Copyright (c) 2024 Apple Inc. All rights reserved.
*
* 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+PositionTry.h"
#include "CSSParserContext.h"
#include "CSSParserTokenRange.h"
#include "CSSPropertyParserConsumer+Anchor.h"
#include "CSSPropertyParserConsumer+Ident.h"
#include "CSSPropertyParserConsumer+List.h"
#include "CSSValueList.h"
namespace WebCore {
namespace CSSPropertyParserHelpers {
RefPtr<CSSValue> consumePositionTryFallbacks(CSSParserTokenRange& range, CSS::PropertyParserState& state)
{
// <'position-try-fallbacks'> = none | [ [<dashed-ident> || <try-tactic>] | <'position-area'> ]#
// https://drafts.csswg.org/css-anchor-position-1/#propdef-position-try-fallbacks
if (auto result = consumeIdent<CSSValueNone>(range))
return result;
auto consumeFallback = [&](CSSParserTokenRange& range) -> RefPtr<CSSValue> {
// Try to parse <'position-area'>
auto rangeCopy = range;
// consumePositionArea accepts 'none', so detect and reject it beforehand.
if (range.peek().id() == CSSValueNone)
return nullptr;
if (auto positionArea = consumePositionArea(range, state))
return positionArea;
range = rangeCopy;
// Try to parse [<dashed-ident> || <try-tactic>]
// <try-tactic> = flip-block || flip-inline || flip-start
auto tryRuleIdent = consumeDashedIdentRaw(range);
Vector<CSSValueID, 3> tryTactics;
while (auto tactic = consumeIdentRaw<CSSValueFlipBlock, CSSValueFlipInline, CSSValueFlipStart>(range)) {
if (tryTactics.contains(*tactic))
return nullptr;
tryTactics.append(*tactic);
}
if (tryRuleIdent.isNull())
tryRuleIdent = consumeDashedIdentRaw(range);
CSSValueListBuilder list;
if (!tryRuleIdent.isNull())
list.append(CSSPrimitiveValue::createCustomIdent(tryRuleIdent));
for (auto tactic : tryTactics)
list.append(CSSPrimitiveValue::create(tactic));
// At least one @position-try rule ident or tactic must be present.
if (list.isEmpty())
return nullptr;
return CSSValueList::createSpaceSeparated(WTFMove(list));
};
return consumeListSeparatedBy<',', OneOrMore, ListOptimization::SingleValue>(range, consumeFallback);
}
} // namespace CSSPropertyParserHelpers
} // namespace WebCore
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