CSS Custom Properties (Variables)

Source/core/style/StyleVariableData.h

+#ifndef StyleVariableData_h
+#define StyleVariableData_h
+
+#include "wtf/Forward.h"
+#include "wtf/HashMap.h"
+#include "wtf/RefCounted.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+class CSSVariableData;
+
+class StyleVariableData : public RefCounted<StyleVariableData> {
+public:
+    static PassRefPtr<StyleVariableData> create() { return adoptRef(new StyleVariableData()); }
+    PassRefPtr<StyleVariableData> copy() const { return adoptRef(new StyleVariableData(*this)); }
+
+    bool operator==(const StyleVariableData& other) const { return other.m_data == m_data; }
+    bool operator!=(const StyleVariableData& other) const { return !(*this == other); }
+
+    void setVariable(const AtomicString& name, CSSVariableData* value) { m_data.set(name, value); }
+    CSSVariableData* getVariable(const AtomicString& name) const { return m_data.get(name); }
+    void removeVariable(const AtomicString& name) { return m_data.remove(name); }
+private:
+    explicit StyleVariableData() : RefCounted<StyleVariableData>() { }
+    StyleVariableData(const StyleVariableData& other) : RefCounted<StyleVariableData>(), m_data(HashMap<AtomicString, CSSVariableData*>(other.m_data)) { }
+
+    friend class CSSVariableResolver;
+
+    HashMap<AtomicString, CSSVariableData*> m_data;
+};
+
+} // namespace blink
+
+#endif // StyleVariableData_h