| /******************************************************************************* |
| * 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.text; |
| |
| |
| |
| import java.util.Enumeration; |
| |
| import org.eclipse.wst.sse.core.internal.provisional.events.StructuredDocumentEvent; |
| import org.eclipse.wst.sse.core.internal.provisional.events.StructuredDocumentRegionsReplacedEvent; |
| import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument; |
| import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion; |
| import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegionList; |
| import org.eclipse.wst.sse.core.internal.util.Utilities; |
| |
| public class StructuredDocumentWalker { |
| |
| IStructuredDocumentRegionList fOldStructuredDocumentRegionList = null; |
| IStructuredDocument fStructuredDocument = null; |
| String fOriginalChanges = null; |
| int fOriginalOffset = 0; |
| int fOriginalLengthToReplace = 0; |
| int fLengthDifference = 0; |
| |
| /** |
| * |
| */ |
| public StructuredDocumentWalker() { |
| } |
| |
| /** |
| * |
| */ |
| public StructuredDocumentWalker(StructuredDocumentEvent event) { |
| initialize(event); |
| } |
| |
| /** |
| * |
| */ |
| public IStructuredDocument getStructuredDocument() { |
| return fStructuredDocument; |
| } |
| |
| /** |
| * Old Nodes: --[O1]--[O2]--[O3]--- : / \ Current Nodes: |
| * ---[C1]-----[C2]-----[C3]-----[C4]--- |
| * |
| * Input: O1 -> Output: O2 Input: O2 -> Output: O3 Input: O3 -> Output: C4 |
| * Input: Cn -> Output: Cn+1 |
| */ |
| public IStructuredDocumentRegion getNextNode(IStructuredDocumentRegion node) { |
| IStructuredDocumentRegion nextNode = null; |
| if (node != null) { |
| nextNode = node.getNext(); |
| if (nextNode == null) { |
| if (isOldNode(node)) { |
| // this may be the end of old flatnodes |
| int newStart = node.getEnd() - fLengthDifference; |
| nextNode = fStructuredDocument.getRegionAtCharacterOffset(newStart); |
| } |
| } |
| } |
| return nextNode; |
| } |
| |
| /** |
| * Old Nodes: --[O1]--[O2]--[O3]--- : / \ Current Nodes: |
| * ---[C1]-----[C2]-----[C3]-----[C4]--- |
| * |
| * Input: O* -> Output: C4 Input: Cn -> Output: Cn+1 |
| */ |
| public IStructuredDocumentRegion getNextNodeInCurrent(IStructuredDocumentRegion node) { |
| IStructuredDocumentRegion nextNode = null; |
| if (isOldNode(node)) { |
| IStructuredDocumentRegion oldEndNode = fOldStructuredDocumentRegionList.item(fOldStructuredDocumentRegionList.getLength() - 1); |
| int newStart = oldEndNode.getEnd() - fLengthDifference; |
| nextNode = fStructuredDocument.getRegionAtCharacterOffset(newStart); |
| } |
| else if (node != null) { |
| nextNode = node.getNext(); |
| } |
| return nextNode; |
| } |
| |
| /** |
| * Old Nodes: --[O1]--[O2]--[O3]--- : / \ Current Nodes: |
| * ---[C1]-----[C2]-----[C3]-----[C4]--- |
| * |
| * Input: O1 -> Output: C1 Input: O2 -> Output: O1 Input: O3 -> Output: O2 |
| * Input: Cn -> Output: Cn-1 |
| */ |
| public IStructuredDocumentRegion getPrevNode(IStructuredDocumentRegion node) { |
| IStructuredDocumentRegion prevNode = null; |
| if (node != null) { |
| prevNode = node.getPrevious(); |
| if (prevNode == null) { |
| if (isOldNode(node)) { |
| // this may be the start of old flatnodes |
| int newEnd = node.getStart() - 1; |
| prevNode = fStructuredDocument.getRegionAtCharacterOffset(newEnd); |
| } |
| } |
| } |
| return prevNode; |
| } |
| |
| /** |
| * Old Nodes: --[O1]--[O2]--[O3]--- : / \ Current Nodes: |
| * ---[C1]-----[C2]-----[C3]-----[C4]--- |
| * |
| * Input: O* -> Output: C1 Input: Cn -> Output: Cn-1 |
| */ |
| public IStructuredDocumentRegion getPrevNodeInCurrent(IStructuredDocumentRegion node) { |
| IStructuredDocumentRegion prevNode = null; |
| if (isOldNode(node)) { |
| IStructuredDocumentRegion oldStartNode = fOldStructuredDocumentRegionList.item(0); |
| int newEnd = oldStartNode.getStart() - 1; |
| prevNode = fStructuredDocument.getRegionAtCharacterOffset(newEnd); |
| } |
| else if (node != null) { |
| prevNode = node.getPrevious(); |
| } |
| return prevNode; |
| } |
| |
| /** |
| * |
| */ |
| public void initialize(StructuredDocumentEvent event) { |
| fStructuredDocument = event.getStructuredDocument(); |
| fOriginalChanges = event.getText(); |
| fOriginalOffset = event.getOffset(); |
| fOriginalLengthToReplace = event.getLength(); |
| fLengthDifference = Utilities.calculateLengthDifference(fOriginalChanges, fOriginalLengthToReplace); |
| |
| if (event instanceof StructuredDocumentRegionsReplacedEvent) { |
| fOldStructuredDocumentRegionList = ((StructuredDocumentRegionsReplacedEvent) event).getOldStructuredDocumentRegions(); |
| } |
| else { |
| fOldStructuredDocumentRegionList = null; |
| } |
| } |
| |
| /** |
| * |
| */ |
| public boolean isOldNode(IStructuredDocumentRegion node) { |
| boolean bOld = false; |
| if (fOldStructuredDocumentRegionList != null) { |
| Enumeration e = fOldStructuredDocumentRegionList.elements(); |
| while (e.hasMoreElements()) { |
| if (e.nextElement() == node) { |
| bOld = true; |
| break; |
| } |
| } |
| } |
| return bOld; |
| } |
| } |