Partial implementation of CSSVariablesMap for CSS Variables CSSOM

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 2985 matching lines @@
 String CSSComputedStyleDeclaration::getPropertyValueInternal(CSSPropertyID propertyID)
 {
     return getPropertyValue(propertyID);
 }
 
 void CSSComputedStyleDeclaration::setPropertyInternal(CSSPropertyID, const String&, bool, ExceptionCode& ec)
 {
     ec = NoModificationAllowedError;
 }
 
+const HashMap<AtomicString, String>* CSSComputedStyleDeclaration::variableMap() const
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    Node* styledNode = this->styledNode();
+    if (!styledNode)
+        return 0;
+    RefPtr<RenderStyle> style = styledNode->computedStyle(styledNode->isPseudoElement() ? NOPSEUDO : m_pseudoElementSpecifier);
+    if (!style)
+        return 0;
+    return style->variables();
+}
+
+unsigned CSSComputedStyleDeclaration::variableCount() const
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    const HashMap<AtomicString, String>* variables = variableMap();
+    if (!variables)
+        return 0;
+    return variables->size();
+}
+
+String CSSComputedStyleDeclaration::variableValue(const AtomicString& name) const
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    const HashMap<AtomicString, String>* variables = variableMap();
+    if (!variables)
+        return emptyString();
+    HashMap<AtomicString, String>::const_iterator it = variables->find(name);
+    if (it == variables->end())
+        return emptyString();
+    return it->value;
+}
+
+void CSSComputedStyleDeclaration::setVariableValue(const AtomicString&, const String&, ExceptionCode& ec)
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    ec = NoModificationAllowedError;
+}
+
+bool CSSComputedStyleDeclaration::removeVariable(const AtomicString&)
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    return false;
+}
+
+void CSSComputedStyleDeclaration::clearVariables(ExceptionCode& ec)
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    ec = NoModificationAllowedError;
+}
+
 PassRefPtr<CSSValueList> CSSComputedStyleDeclaration::getBackgroundShorthandValue() const
 {
     static const CSSPropertyID propertiesBeforeSlashSeperator[5] = { CSSPropertyBackgroundColor, CSSPropertyBackgroundImage,
                                                                      CSSPropertyBackgroundRepeat, CSSPropertyBackgroundAttachment,  
                                                                      CSSPropertyBackgroundPosition };
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin, 
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(getCSSPropertyValuesForShorthandProperties(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore