| /******************************************************************************* |
| * Copyright (c) 2004 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.css.core.internal.util; |
| |
| import java.util.ArrayList; |
| import java.util.Stack; |
| import java.util.Vector; |
| |
| import org.eclipse.wst.css.core.internal.provisional.document.ICSSImportRule; |
| import org.eclipse.wst.css.core.internal.provisional.document.ICSSModel; |
| import org.eclipse.wst.css.core.internal.provisional.document.ICSSNode; |
| import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleSheet; |
| |
| |
| |
| /** |
| * |
| */ |
| public abstract class AbstractCssTraverser { |
| |
| public static short TRAV_CONT = 0; |
| public static short TRAV_PRUNE = 1; |
| public static short TRAV_STOP = 2; |
| protected java.util.Stack travStack; |
| private boolean fTraverseImported = false; |
| private boolean fTraverseImportFirst = false; |
| private java.util.Vector traversedSheets; |
| |
| /** |
| * CssPropCMNode constructor comment. |
| */ |
| public AbstractCssTraverser() { |
| super(); |
| } |
| |
| /** |
| * @param model |
| * org.eclipse.wst.css.core.model.interfaces.ICSSModel |
| */ |
| public final void apply(ICSSModel model) { |
| apply(model.getDocument()); |
| } |
| |
| public final void apply(ICSSNode root) { |
| travStack = new Stack(); |
| if (fTraverseImported) { |
| traversedSheets = new Vector(); |
| if (root != null && root.getOwnerDocument() != null && root.getOwnerDocument().getNodeType() == ICSSNode.STYLESHEET_NODE) { |
| traversedSheets.add(root.getOwnerDocument()); |
| } |
| } |
| |
| // first call begin() |
| begin(root); |
| |
| // traverse |
| traverse(root); |
| |
| // last call end() |
| end(root); |
| } |
| |
| |
| protected void begin(ICSSNode node) { |
| } |
| |
| |
| protected void end(ICSSNode node) { |
| } |
| |
| /** |
| * @return boolean |
| */ |
| public final boolean isTraverseImported() { |
| return fTraverseImported; |
| } |
| |
| |
| protected short postNode(ICSSNode node) { |
| return (short) 0; |
| } |
| |
| |
| protected short preNode(ICSSNode node) { |
| return (short) 0; |
| } |
| |
| /** |
| * @param newTraverseImported |
| * boolean |
| */ |
| public final void setTraverseImported(boolean newTraverseImported) { |
| fTraverseImported = newTraverseImported; |
| } |
| |
| /** |
| * @param newTraverseImportFirst |
| * boolean |
| */ |
| public final void setTraverseImportFirst(boolean newTraverseImportFirst) { |
| fTraverseImportFirst = newTraverseImportFirst; |
| } |
| |
| |
| private final short traverse(ICSSNode node) { |
| if (node == null) |
| return TRAV_CONT; |
| |
| travStack.push(node); |
| |
| // pre-action |
| short ret = preNode(node); |
| |
| if (ret == TRAV_CONT) { |
| if (fTraverseImported && (node.getNodeType() == ICSSNode.IMPORTRULE_NODE)) { |
| ICSSImportRule rule = (ICSSImportRule) node; |
| // traverse external style-sheet |
| ICSSStyleSheet sheet = (ICSSStyleSheet) rule.getStyleSheet(); |
| if (sheet != null && !traversedSheets.contains(sheet)) { // prevent |
| // loop |
| traversedSheets.add(sheet); |
| short retExt = traverse(sheet); |
| if (retExt == TRAV_STOP) { |
| travStack.pop(); |
| return retExt; |
| } |
| } |
| } |
| |
| // collect children |
| ArrayList children = new ArrayList(); |
| ICSSNode child = node.getFirstChild(); |
| if (fTraverseImportFirst) { |
| ArrayList others = new ArrayList(); |
| |
| while (child != null) { |
| if (child.getNodeType() == ICSSNode.IMPORTRULE_NODE) |
| children.add(child); |
| else |
| others.add(child); |
| child = child.getNextSibling(); |
| } |
| children.addAll(others); |
| } |
| else { |
| while (child != null) { |
| children.add(child); |
| child = child.getNextSibling(); |
| } |
| } |
| |
| // traverse children |
| for (int i = 0; i < children.size(); i++) { |
| child = (ICSSNode) children.get(i); |
| short retChild = traverse(child); |
| if (retChild == TRAV_STOP) { |
| travStack.pop(); |
| return retChild; |
| } |
| } |
| } |
| else if (ret == TRAV_STOP) { |
| travStack.pop(); |
| return ret; |
| } |
| |
| // post-action |
| ret = postNode(node); |
| |
| travStack.pop(); |
| return (ret == TRAV_PRUNE) ? TRAV_CONT : ret; |
| } |
| } |