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// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2021 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR 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.
#pragma once
#include "CSSValue.h"
#include "CSSValueKeywords.h"
#include "CSSVariableData.h"
#include <wtf/PointerComparison.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CSSParserToken;
class CSSParserTokenRange;
struct CSSParserContext;
namespace Style {
class BuilderState;
}
enum CSSPropertyID : uint16_t;
class CSSVariableReferenceValue final : public CSSValue {
public:
static Ref<CSSVariableReferenceValue> create(const CSSParserTokenRange&, const CSSParserContext&);
static Ref<CSSVariableReferenceValue> create(Ref<CSSVariableData>&&);
bool equals(const CSSVariableReferenceValue&) const;
String customCSSText(const CSS::SerializationContext&) const;
RefPtr<CSSVariableData> resolveVariableReferences(Style::BuilderState&) const;
const CSSParserContext& context() const;
RefPtr<CSSValue> resolveSingleValue(Style::BuilderState&, CSSPropertyID) const;
// The maximum number of tokens that may be produced by a var() reference or var() fallback value.
// https://drafts.csswg.org/css-variables/#long-variables
static constexpr size_t maxSubstitutionTokens = 65536;
const CSSVariableData& data() const { return m_data.get(); }
template<typename CacheFunction> bool resolveAndCacheValue(Style::BuilderState&, CacheFunction&&) const;
private:
explicit CSSVariableReferenceValue(Ref<CSSVariableData>&&);
std::optional<Vector<CSSParserToken>> resolveTokenRange(CSSParserTokenRange, Style::BuilderState&) const;
bool resolveVariableReference(CSSParserTokenRange, CSSValueID, Vector<CSSParserToken>&, Style::BuilderState&) const;
enum class FallbackResult : uint8_t { None, Valid, Invalid };
std::pair<FallbackResult, Vector<CSSParserToken>> resolveVariableFallback(const AtomString& variableName, CSSParserTokenRange, CSSValueID functionId, Style::BuilderState&) const;
void cacheSimpleReference();
RefPtr<CSSVariableData> tryResolveSimpleReference(Style::BuilderState&) const;
Ref<CSSVariableData> m_data;
mutable String m_stringValue;
// For quicky resolving simple var(--foo) values.
struct SimpleReference {
AtomString name;
CSSValueID functionId;
};
std::optional<SimpleReference> m_simpleReference;
mutable RefPtr<CSSVariableData> m_cacheDependencyData;
mutable RefPtr<CSSValue> m_cachedValue;
#if ASSERT_ENABLED
mutable CSSPropertyID m_cachePropertyID { CSSPropertyInvalid };
#endif
};
template<typename CacheFunction>
bool CSSVariableReferenceValue::resolveAndCacheValue(Style::BuilderState& builderState, CacheFunction&& cacheFunction) const
{
if (auto data = tryResolveSimpleReference(builderState)) {
if (!arePointingToEqualData(m_cacheDependencyData, data))
cacheFunction(data);
m_cacheDependencyData = WTFMove(data);
return true;
}
auto resolvedTokens = resolveTokenRange(m_data->tokenRange(), builderState);
if (!resolvedTokens)
return false;
if (!m_cacheDependencyData || m_cacheDependencyData->tokens() != *resolvedTokens) {
m_cacheDependencyData = CSSVariableData::create(*resolvedTokens, context());
cacheFunction(m_cacheDependencyData);
}
return true;
}
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSVariableReferenceValue, isVariableReferenceValue())
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