CSS Custom Properties (Variables)

third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h

+// 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 CSSVariableReferenceValue;
+class StyleResolverState;
+class StyleVariableData;
+
+class CSSVariableResolver {
+public:
+    static void resolveVariableDefinitions(StyleVariableData*);
+    static void resolveAndApplyVariableReferences(StyleResolverState&, CSSPropertyID, const CSSVariableReferenceValue&);
+
+private:
+    CSSVariableResolver(StyleVariableData*);
+    CSSVariableResolver(StyleVariableData*, AtomicString& variable);
+
+    unsigned resolveVariableTokensRecursive(Vector<CSSParserToken>&, unsigned startOffset);
+    void resolveVariableReferencesFromTokens(Vector<CSSParserToken>& tokens);
+
+    StyleVariableData* m_styleVariableData;
+    HashSet<AtomicString> m_variablesSeen;
+    bool m_cycleDetected;
+};
+
+} // namespace blink
+
+#endif // CSSVariableResolver