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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.filebuffers.manipulation;
import org.eclipse.core.internal.filebuffers.FileBuffersPlugin;
import org.eclipse.core.internal.filebuffers.Progress;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.filebuffers.IFileBufferStatusCodes;
import org.eclipse.core.filebuffers.ITextFileBuffer;
import org.eclipse.text.edits.DeleteEdit;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentRewriteSessionType;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
/**
* A text file buffer operations that removes all trailing whitespace.
* <p>
* Not yet for public use. API under construction.
*
* @since 3.1
*/
public class RemoveTrailingWhitespaceOperation extends TextFileBufferOperation {
/**
* Creates a remove trailing whitespace operation.
*/
public RemoveTrailingWhitespaceOperation() {
super(FileBuffersMessages.getString("RemoveTrailingWhitespaceOperation.name")); //$NON-NLS-1$
}
/*
* @see org.eclipse.core.internal.filebuffers.textmanipulation.TextFileBufferOperation#computeTextEdit(org.eclipse.core.filebuffers.ITextFileBuffer, org.eclipse.core.runtime.IProgressMonitor)
*/
protected MultiTextEditWithProgress computeTextEdit(ITextFileBuffer fileBuffer, IProgressMonitor progressMonitor) throws CoreException {
IDocument document= fileBuffer.getDocument();
int lineCount= document.getNumberOfLines();
progressMonitor= Progress.getMonitor(progressMonitor);
progressMonitor.beginTask(FileBuffersMessages.getString("RemoveTrailingWhitespaceOperation.task.generatingChanges"), lineCount); //$NON-NLS-1$
try {
MultiTextEditWithProgress multiEdit= new MultiTextEditWithProgress(FileBuffersMessages.getString("RemoveTrailingWhitespaceOperation.task.applyingChanges")); //$NON-NLS-1$
for (int i= 0; i < lineCount; i++) {
if (progressMonitor.isCanceled())
throw new OperationCanceledException();
IRegion region= document.getLineInformation(i);
if (region.getLength() == 0)
continue;
int lineStart= region.getOffset();
int lineExclusiveEnd= lineStart + region.getLength();
int j= lineExclusiveEnd -1;
while (j >= lineStart && Character.isWhitespace(document.getChar(j))) --j;
++j;
if (j < lineExclusiveEnd)
multiEdit.addChild(new DeleteEdit(j, lineExclusiveEnd - j));
progressMonitor.worked(1);
}
return multiEdit.getChildrenSize() <= 0 ? null : multiEdit;
} catch (BadLocationException x) {
throw new CoreException(new Status(IStatus.ERROR, FileBuffersPlugin.PLUGIN_ID, IFileBufferStatusCodes.CONTENT_CHANGE_FAILED, "", x)); //$NON-NLS-1$
} finally {
progressMonitor.done();
}
}
/*
* @see org.eclipse.core.filebuffers.manipulation.TextFileBufferOperation#getDocumentRewriteSessionType()
*/
protected DocumentRewriteSessionType getDocumentRewriteSessionType() {
return DocumentRewriteSessionType.SEQUENTIAL;
}
}
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