themeinstaller/source/src/com/nokia/tools/themeinstaller/cssparser/CSSMatchMaker.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/themeinstaller/source/src/com/nokia/tools/themeinstaller/cssparser/CSSMatchMaker.java Wed Sep 01 12:32:13 2010 +0100
@@ -0,0 +1,273 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: Compares W3C DOM Elements and CSS Selectors
+ *
+*/
+
+
+package com.nokia.tools.themeinstaller.cssparser;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.w3c.css.sac.AttributeCondition;
+import org.w3c.css.sac.CSSException;
+import org.w3c.css.sac.CombinatorCondition;
+import org.w3c.css.sac.Condition;
+import org.w3c.css.sac.ConditionalSelector;
+import org.w3c.css.sac.DescendantSelector;
+import org.w3c.css.sac.ElementSelector;
+import org.w3c.css.sac.Selector;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+/**
+ * The Class CSSMatchMaker compares W3C DOM Elements and CSS Selectors. Match
+ * method returns true if CSS Selector has style rules for the given DOM Element
+ */
+public class CSSMatchMaker
+ {
+
+ /** The Constant STRING_CLASS. */
+ private static final String STRING_CLASS = "class";
+
+ /** The Constant STRING_ID. */
+ private static final String STRING_ID = "id";
+
+ /** The Constant STRING_SPACE. */
+ private static final String STRING_SPACE = " ";
+
+ /** The pseudo class resolver. */
+ private PseudoClassResolver iPseudoClassResolver;
+
+ /**
+ * Instantiates a new CSS Match Maker.
+ */
+ public CSSMatchMaker()
+ {
+ iPseudoClassResolver = new PseudoClassResolver();
+ }
+
+ /**
+ * Compares if CSS rule with it's selector has style instructions for given
+ * DOM Element.
+ *
+ * @param aElement W3C DOM Element
+ * @param aRule The style rule
+ *
+ * @return true, if CSS Selector matches DOM Element
+ */
+ public boolean match( CSSRule aRule, Element aElement ){
+ aRule.resetSpecificity();
+ return match( aRule.getSelector(), aRule.getSpecificity(), aElement );
+
+ }
+
+ /**
+ * Compares if CSS rule's selector has style instructions for given DOM
+ * Element.
+ *
+ * @param aSelector the a selector
+ * @param aSpecificity CSSRules specificity table to be updated during the
+ * comparison
+ * @param aElement the a element
+ *
+ * @return true, if given selector match DOM Element
+ */
+ private boolean match( Selector aSelector, CSSSpecificity aSpecificity, Element aElement )
+ {
+ switch ( aSelector.getSelectorType() )
+ {
+ case Selector.SAC_ELEMENT_NODE_SELECTOR:
+ {
+ ElementSelector eSelector = ( ElementSelector ) aSelector;
+ String name = eSelector.getLocalName();
+// if("box".equals(aElement.getLocalName())&& "box".equals(name) ){
+// System.out.println("!!!");
+// }
+ if ( name == null || name.equals( aElement.getLocalName() ) )
+ {
+ aSpecificity.incElement();
+ return true;
+ }
+ return false;
+ }
+
+ case Selector.SAC_CONDITIONAL_SELECTOR:
+ {
+ ConditionalSelector cSelector = ( ConditionalSelector ) aSelector;
+ if ( !match( cSelector.getSimpleSelector(), aSpecificity,
+ aElement ) )
+ {
+ return false;
+ }
+ return matchCondition( cSelector.getCondition(), aSpecificity,
+ aElement );
+ }
+
+ case Selector.SAC_CHILD_SELECTOR:
+ {
+ DescendantSelector dSelector = ( DescendantSelector ) aSelector;
+ if ( !match( dSelector.getSimpleSelector(), aSpecificity,
+ aElement ) )
+ {
+ return false;
+ }
+ return match( dSelector.getAncestorSelector(), aSpecificity,
+ ( Element ) aElement.getParentNode() );
+ }
+ case Selector.SAC_DESCENDANT_SELECTOR:
+ {
+ DescendantSelector dSelector = ( DescendantSelector ) aSelector;
+ if ( !match( dSelector.getSimpleSelector(), aSpecificity,
+ aElement ) )
+ {
+ return false;
+ }
+
+ Node ancestor = aElement;
+ while ( ( ancestor = ancestor.getParentNode() ) != null )
+ {
+ if ( ancestor.getNodeType() == Node.ELEMENT_NODE )
+ {
+ if ( match( dSelector.getAncestorSelector(),
+ aSpecificity, ( Element ) ancestor ) )
+ {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+ case Selector.SAC_ANY_NODE_SELECTOR:
+ case Selector.SAC_DIRECT_ADJACENT_SELECTOR:
+ case Selector.SAC_CDATA_SECTION_NODE_SELECTOR:
+ case Selector.SAC_COMMENT_NODE_SELECTOR:
+ case Selector.SAC_NEGATIVE_SELECTOR:
+ case Selector.SAC_PROCESSING_INSTRUCTION_NODE_SELECTOR:
+ case Selector.SAC_PSEUDO_ELEMENT_SELECTOR:
+ case Selector.SAC_ROOT_NODE_SELECTOR:
+ case Selector.SAC_TEXT_NODE_SELECTOR:
+ {
+ throw new CSSException( "Selector : "
+ + aSelector.getSelectorType() + " not supported" );
+ }
+ default:
+ throw new CSSException( "Unknown selector : "
+ + aSelector.getSelectorType() );
+ }
+ }
+
+ /**
+ * For Conditional Selectors, it is also necessary to check if selectors
+ * conditions match with the DOM Element.
+ *
+ * @param aCondition The condition of the conditional selector
+ * @param aElement The DOM element
+ * @param aSpecificity CSSRules specificity table to be updated during the
+ * comparison
+ *
+ * @return true, if given Condition match DOM Element
+ */
+ private boolean matchCondition( Condition aCondition,
+ CSSSpecificity aSpecificity, Element aElement )
+ {
+ switch ( aCondition.getConditionType() )
+ {
+ case Condition.SAC_ID_CONDITION:
+ {
+ AttributeCondition idCondition = ( AttributeCondition ) aCondition;
+ String idAttribute = aElement.getAttribute( STRING_ID );
+
+ String[] idTexts = idAttribute.split( STRING_SPACE );
+
+ for ( int i = 0; i < idTexts.length; i++ )
+ {
+ String idText = idTexts[ i ];
+ if ( idAttribute != null
+ && idText.equals( idCondition.getValue() ) )
+ {
+ aSpecificity.incID();
+ return true;
+ }
+ }
+ return false;
+ }
+
+ case Condition.SAC_CLASS_CONDITION:
+ {
+ AttributeCondition classCondition = ( AttributeCondition ) aCondition;
+ String classAttribute = aElement.getAttribute( STRING_CLASS );
+
+ String[] classTexts = classAttribute.split( STRING_SPACE );
+
+ for ( int i = 0; i < classTexts.length; i++ )
+ {
+ String classText = classTexts[ i ];
+ if ( classAttribute != null
+ && classText.equals( classCondition.getValue() ) )
+ {
+ aSpecificity.incAttribute();
+ return true;
+ }
+ }
+ return false;
+ }
+
+ case Condition.SAC_AND_CONDITION:
+ {
+ CombinatorCondition combCondition = ( CombinatorCondition ) aCondition;
+ return matchCondition( combCondition.getFirstCondition(),
+ aSpecificity, aElement )
+ && matchCondition( combCondition.getSecondCondition(),
+ aSpecificity, aElement );
+ }
+
+ case Condition.SAC_PSEUDO_CLASS_CONDITION:
+ {
+ Collection pseudoTypes = iPseudoClassResolver
+ .getPseudoTypes();
+
+ for ( Iterator it = pseudoTypes.iterator(); it
+ .hasNext(); )
+ {
+ if ( it.next()
+ .equals( aCondition.toString().substring( 1 ) ) )
+ {
+ aSpecificity.incAttribute();
+ return true;
+ }
+ }
+ return false;
+ }
+ case Condition.SAC_ATTRIBUTE_CONDITION:
+ case Condition.SAC_ONE_OF_ATTRIBUTE_CONDITION:
+ case Condition.SAC_BEGIN_HYPHEN_ATTRIBUTE_CONDITION:
+ case Condition.SAC_OR_CONDITION:
+ case Condition.SAC_NEGATIVE_CONDITION:
+ case Condition.SAC_POSITIONAL_CONDITION:
+ case Condition.SAC_LANG_CONDITION:
+ case Condition.SAC_ONLY_CHILD_CONDITION:
+ case Condition.SAC_ONLY_TYPE_CONDITION:
+ case Condition.SAC_CONTENT_CONDITION:
+ {
+ throw new CSSException( "condition : "
+ + aCondition.getConditionType() + " not supported" );
+ }
+ default:
+ throw new CSSException( "Unknown condition : "
+ + aCondition.getConditionType() );
+ }
+ }
+ }