Partial implementation of CSSVariablesMap for CSS Variables CSSOM

Source/core/css/CSSVariablesMap.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CSSVariablesMap_h
+#define CSSVariablesMap_h
+
+#include "RuntimeEnabledFeatures.h"
+#include "core/css/CSSStyleDeclaration.h"
+#include "wtf/RefCounted.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+typedef int ExceptionCode;
+
+class CSSVariablesMap : public RefCounted<CSSVariablesMap> {
+public:
+    virtual ~CSSVariablesMap() { }
+
+    static PassRefPtr<CSSVariablesMap> create(CSSStyleDeclaration* styleDeclaration)
+    {
+        // FIXME: Recycle existing CSSVariablesMaps for CSSStyleDeclarations.
+        return adoptRef(new CSSVariablesMap(styleDeclaration));
+    }
+
+    unsigned size() const
+    {
+        return m_styleDeclaration->variableCount();
+    }
+
+    String get(const AtomicString& name) const
+    {
+        return m_styleDeclaration->variableValue(name);
+    }
+
+    bool has(const AtomicString& name) const
+    {
+        return !get(name).isEmpty();
+    }
+
+    void set(const AtomicString& name, const String& value, ExceptionCode& ec) const
+    {
+        m_styleDeclaration->setVariableValue(name, value, ec);
+    }
+
+    bool deleteImpl(const AtomicString& name) const
+    {
+        return m_styleDeclaration->removeVariable(name);
+    }
+
+    void clear(ExceptionCode& ec) const
+    {
+        return m_styleDeclaration->clearVariables(ec);
+    }
+
+private:
+    explicit CSSVariablesMap(CSSStyleDeclaration* styleDeclaration)
+        : m_styleDeclaration(styleDeclaration)
+    {
+        ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    }
+
+    RefPtr<CSSStyleDeclaration> m_styleDeclaration;
+};
+
+} // namespace WebCore
+
+#endif // CSSVariablesMap_h