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// Copyright 2015 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.
#ifndef CSSVariableResolver_h
#define CSSVariableResolver_h
#include "core/CSSPropertyNames.h"
#include "core/css/parser/CSSParserToken.h"
#include "wtf/HashSet.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/AtomicStringHash.h"
namespace blink {
class CSSParserTokenRange;
class CSSPendingSubstitutionValue;
class CSSVariableData;
class CSSVariableReferenceValue;
class PropertyRegistry;
class StyleResolverState;
class StyleInheritedVariables;
class StyleNonInheritedVariables;
class CSSVariableResolver {
STACK_ALLOCATED();
public:
static void resolveVariableDefinitions(const StyleResolverState&);
// Shorthand properties are not supported.
static const CSSValue* resolveVariableReferences(
const StyleResolverState&,
CSSPropertyID,
const CSSValue&,
bool disallowAnimationTainted);
static void computeRegisteredVariables(const StyleResolverState&);
DECLARE_TRACE();
private:
CSSVariableResolver(const StyleResolverState&);
static const CSSValue* resolvePendingSubstitutions(
const StyleResolverState&,
CSSPropertyID,
const CSSPendingSubstitutionValue&,
bool disallowAnimationTainted);
static const CSSValue* resolveVariableReferences(
const StyleResolverState&,
CSSPropertyID,
const CSSVariableReferenceValue&,
bool disallowAnimationTainted);
// These return false if we encounter a reference to an invalid variable with
// no fallback.
// Resolves a range which may contain var() references or @apply rules.
bool resolveTokenRange(CSSParserTokenRange,
bool disallowAnimationTainted,
Vector<CSSParserToken>& result,
bool& resultIsAnimationTainted);
// Resolves the fallback (if present) of a var() reference, starting from the
// comma.
bool resolveFallback(CSSParserTokenRange,
bool disallowAnimationTainted,
Vector<CSSParserToken>& result,
bool& resultIsAnimationTainted);
// Resolves the contents of a var() reference.
bool resolveVariableReference(CSSParserTokenRange,
bool disallowAnimationTainted,
Vector<CSSParserToken>& result,
bool& resultIsAnimationTainted);
// Consumes and resolves an @apply rule.
void resolveApplyAtRule(CSSParserTokenRange&, Vector<CSSParserToken>& result);
// These return null if the custom property is invalid.
// Returns the CSSVariableData for a custom property, resolving and storing it
// if necessary.
CSSVariableData* valueForCustomProperty(AtomicString name);
// Resolves the CSSVariableData from a custom property declaration.
PassRefPtr<CSSVariableData> resolveCustomProperty(AtomicString name,
const CSSVariableData&);
StyleInheritedVariables* m_inheritedVariables;
StyleNonInheritedVariables* m_nonInheritedVariables;
Member<const PropertyRegistry> m_registry;
HashSet<AtomicString> m_variablesSeen;
// Resolution doesn't finish when a cycle is detected. Fallbacks still
// need to be tracked for additional cycles, and invalidation only
// applies back to cycle starts.
HashSet<AtomicString> m_cycleStartPoints;
};
} // namespace blink
#endif // CSSVariableResolver
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