| /******************************************************************************* |
| * Copyright (c) 2001, 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 |
| * Jens Lukowski/Innoopract - initial renaming/restructuring |
| * |
| *******************************************************************************/ |
| package org.eclipse.wst.xml.core.internal.parser.regions; |
| |
| import org.eclipse.wst.sse.core.internal.provisional.events.RegionChangedEvent; |
| import org.eclipse.wst.sse.core.internal.provisional.events.StructuredDocumentEvent; |
| import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion; |
| import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion; |
| import org.eclipse.wst.sse.core.internal.util.Debug; |
| import org.eclipse.wst.sse.core.internal.util.Utilities; |
| import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext; |
| |
| |
| |
| public class XMLContentRegion implements ITextRegion { |
| static private final String fType = DOMRegionContext.XML_CONTENT; |
| // length and textLength are always the same for content region |
| //private int fTextLength; |
| private int fLength; |
| private int fStart; |
| |
| |
| public XMLContentRegion() { |
| super(); |
| } |
| |
| public XMLContentRegion(int start, int length) { |
| this(); |
| fStart = start; |
| fLength = length; |
| } |
| |
| |
| public void adjustLength(int i) { |
| fLength += i; |
| |
| } |
| |
| public void adjustStart(int i) { |
| fStart += i; |
| |
| } |
| |
| |
| public void adjustTextLength(int i) { |
| // not supported |
| |
| } |
| |
| public void equatePositions(ITextRegion region) { |
| fStart = region.getStart(); |
| fLength = region.getLength(); |
| } |
| |
| public int getEnd() { |
| return fStart + fLength; |
| } |
| |
| public int getLength() { |
| return fLength; |
| } |
| |
| public int getStart() { |
| return fStart; |
| } |
| |
| public int getTextEnd() { |
| return fStart + fLength; |
| } |
| |
| public int getTextLength() { |
| return fLength; |
| } |
| |
| public String getType() { |
| return fType; |
| } |
| |
| public String toString() { |
| return RegionToStringUtil.toString(this); |
| } |
| |
| |
| public StructuredDocumentEvent updateRegion(Object requester, IStructuredDocumentRegion parent, String changes, int requestStart, int lengthToReplace) { |
| // TODO: this is a pretty lame method, since XML Content can have a |
| // much |
| // better rule for region update, but this is what previous |
| // (unfactored) |
| // version had, so I'll carry it over, of now. |
| RegionChangedEvent result = null; |
| // if the region is an easy type (e.g. attribute value), |
| // and the requested changes are all |
| // alphanumeric, then make the change here locally. |
| // (This can obviously be made more sophisticated as the need arises, |
| // but should |
| // always follow this pattern.) |
| if (Debug.debugStructuredDocument) { |
| System.out.println("\t\tContextRegion::updateModel"); //$NON-NLS-1$ |
| System.out.println("\t\t\tregion type is " + fType); //$NON-NLS-1$ |
| } |
| boolean canHandle = false; |
| // note: we'll always handle deletes from these |
| // regions ... if its already that region, |
| // deleting something from it won't change its |
| // type. (remember, the calling program needs |
| // to insure we are not called, if not all contained |
| // on one region. |
| if ((changes == null) || (changes.length() == 0)) { |
| // delete case |
| // We can not do the quick delete, if |
| // if all the text in a region is to be deleted. |
| // Or, if the delete starts in the white space region. |
| // In these cases, a reparse is needed. |
| // Minor note, we use textEnd-start since it always |
| // less than or equal to end-start. This might |
| // cause us to miss a few cases we could have handled, |
| // but will prevent us from trying to handle funning cases |
| // involving whitespace. |
| if ((fStart >= getTextEnd()) || (Math.abs(lengthToReplace) >= getTextEnd() - getStart())) { |
| canHandle = false; |
| } else { |
| canHandle = true; |
| } |
| } else { |
| if ((RegionUpdateRule.canHandleAsWhiteSpace(this, parent, changes, requestStart, lengthToReplace)) || RegionUpdateRule.canHandleAsLetterOrDigit(this, parent, changes, requestStart, lengthToReplace)) { |
| canHandle = true; |
| } else { |
| canHandle = false; |
| } |
| |
| } |
| if (canHandle) { |
| // at this point, we still have the old region. We won't create a |
| // new instance, we'll just update the one we have, by changing |
| // its end postion, |
| // The parent flatnode, upon return, has responsibility |
| // for updating sibling regions. |
| // and in turn, the structuredDocument itself has responsibility |
| // for |
| // updating the text store and down stream flatnodes. |
| if (Debug.debugStructuredDocument) { |
| System.out.println("change handled by region"); //$NON-NLS-1$ |
| } |
| int lengthDifference = Utilities.calculateLengthDifference(changes, lengthToReplace); |
| // Note: we adjust both end and text end, because for any change |
| // that is in only the trailing whitespace region, we should not |
| // do a quick change, |
| // so 'canHandle' should have been false for those case. |
| fLength += lengthDifference; |
| // TO_DO_FUTURE: cache value of canHandleAsWhiteSpace from above |
| // If we are handling as whitespace, there is no need to increase |
| // the text length, only |
| // the total length is changing. |
| // don't need for content region |
| // if (!RegionUpdateRule.canHandleAsWhiteSpace(this, changes, |
| // fStart, lengthToReplace)) { |
| // fTextLength += lengthDifference; |
| // } |
| result = new RegionChangedEvent(parent.getParentDocument(), requester, parent, this, changes, requestStart, lengthToReplace); |
| } |
| |
| return result; |
| } |
| |
| } |