CSS Properties and Values API: Support non-inherited custom properties

third_party/WebKit/Source/core/style/StyleNonInheritedVariables.h

+// Copyright 2016 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 StyleNonInheritedVariables_h
+#define StyleNonInheritedVariables_h
+
+#include "core/css/CSSValue.h"
+#include "core/css/CSSVariableData.h"
+#include "wtf/Forward.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+class StyleNonInheritedVariables {
+public:
+    static std::unique_ptr<StyleNonInheritedVariables> create() { return wrapUnique(new StyleNonInheritedVariables); }
+
+    std::unique_ptr<StyleNonInheritedVariables> copy() { return wrapUnique(new StyleNonInheritedVariables(*this)); }
+
+    bool operator==(const StyleNonInheritedVariables& other) const;
+    bool operator!=(const StyleNonInheritedVariables& other) const { return !(*this == other); }
+
+    void setVariable(const AtomicString& name, PassRefPtr<CSSVariableData> value) { m_data.set(name, value); }
+    CSSVariableData* getVariable(const AtomicString& name) const;
+    void removeVariable(const AtomicString&);
+
+    void setRegisteredVariable(const AtomicString&, const CSSValue*);
+    CSSValue* registeredVariable(const AtomicString& name) const { return m_registeredData.get(name); }
+
+private:
+    StyleNonInheritedVariables() = default;
+    StyleNonInheritedVariables(StyleNonInheritedVariables&);
+
+    friend class CSSVariableResolver;
+
+    HashMap<AtomicString, RefPtr<CSSVariableData>> m_data;
+    HashMap<AtomicString, Persistent<CSSValue>> m_registeredData;
+};
+
+} // namespace blink
+
+#endif // StyleNonInheritedVariables_h