CSS Custom Properties (Variables)

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

Index: third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h
diff --git a/third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h b/third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h
new file mode 100644
index 0000000000000000000000000000000000000000..4752373ca562db79dd89f844e863764c84c9ca74
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h
@@ -0,0 +1,39 @@
+// 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(StyleResolverState&);

[Timothy Loh, 2015/10/15 03:43:48]

maybe this should take a 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