diff -r fe49e33862e2 -r 04b7640f6fb5 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() ); + } + } + }