/*******************************************************************************
* Copyright (c) 2004, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.html.core.internal.htmlcss;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSNode;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSSelector;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSSelectorList;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleDeclaration;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleRule;
import org.eclipse.wst.css.core.internal.util.AbstractCssTraverser;
import org.eclipse.wst.css.core.internal.util.CSSStyleDeclarationFactory;
import org.w3c.dom.Element;
import org.w3c.dom.css.ElementCSSInlineStyle;
/**
*/
public class CSSQueryTraverser extends AbstractCssTraverser {
private Element element;
private String pseudoName;
private CSSQueryContext context = null;
ICSSStyleDeclaration decl = null;
/**
*/
public ICSSStyleDeclaration getDeclaration() {
try {
ICSSStyleDeclaration inlineStyle = (ICSSStyleDeclaration) ((ElementCSSInlineStyle) element).getStyle();
if (inlineStyle != null) {
if (context == null) {
context = new CSSQueryContext();
}
context.overrideWithExpand(inlineStyle, 10000);
// style attribute's specificity is 100 (in CSS2 spec.) and
// our implement use 100 as base number (see CSSSelector.java)
}
}
catch (ClassCastException ex) {
// element is not ElementCSSInlineStyle ???
}
if (context == null)
return null;
if (decl == null)
decl = CSSStyleDeclarationFactory.getInstance().createStyleDeclaration();
context.applyFull(decl);
return decl;
}
/**
*/
private void overwriteDeclaration(ICSSStyleDeclaration d, int specificity) {
if (d == null)
return;
if (context == null)
context = new CSSQueryContext();
context.overrideWithExpand(d, specificity);
}
/**
*/
protected short postNode(ICSSNode node) {
return TRAV_CONT;
}
/**
*/
protected short preNode(ICSSNode node) {
if (node instanceof ICSSStyleRule) {
// style rule
ICSSStyleRule style = (ICSSStyleRule) node;
ICSSSelectorList list = style.getSelectors();
int nSelectors = list.getLength();
int maxSpecificity = -1;
for (int iSelector = 0; iSelector < nSelectors; iSelector++) {
// Check each Selector Lists
ICSSSelector selector = list.getSelector(iSelector);
int specificity = selector.getSpecificity();
if (maxSpecificity < specificity && selector.match(element, pseudoName)) {
maxSpecificity = specificity;
}
}
if (maxSpecificity >= 0) {
// apply this style to the element
overwriteDeclaration((ICSSStyleDeclaration) style.getStyle(), maxSpecificity);
}
return TRAV_PRUNE;
}
return TRAV_CONT;
}
/**
*/
private void resetContext() {
context = null;
}
/**
*/
public void setElement(Element element, String pseudoName) {
this.element = element;
this.pseudoName = pseudoName;
resetContext();
}
}