/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.ivyde.internal.eclipse.ui.editors.xml;
import org.apache.ivyde.internal.eclipse.IvyPlugin;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.presentation.IPresentationDamager;
import org.eclipse.jface.text.presentation.IPresentationRepairer;
import org.eclipse.swt.custom.StyleRange;
public class NonRuleBasedDamagerRepairer implements IPresentationDamager, IPresentationRepairer {
/** The document this object works on */
private IDocument fDocument;
/** The default text attribute if non is returned as data by the current token */
private TextAttribute fDefaultTextAttribute;
/**
* Constructor for NonRuleBasedDamagerRepairer.
*/
public NonRuleBasedDamagerRepairer(TextAttribute defaultTextAttribute) {
Assert.isNotNull(defaultTextAttribute);
fDefaultTextAttribute = defaultTextAttribute;
}
/**
* @see IPresentationRepairer#setDocument(IDocument)
*/
public void setDocument(IDocument document) {
fDocument = document;
}
/**
* Returns the end offset of the line that contains the specified offset or if the offset is
* inside a line delimiter, the end offset of the next line.
*
* @param offset
* the offset whose line end offset must be computed
* @return the line end offset for the given offset
* @exception BadLocationException
* if offset is invalid in the current document
*/
protected int endOfLineOf(int offset) throws BadLocationException {
IRegion info = fDocument.getLineInformationOfOffset(offset);
if (offset <= info.getOffset() + info.getLength()) {
return info.getOffset() + info.getLength();
}
int line = fDocument.getLineOfOffset(offset);
try {
info = fDocument.getLineInformation(line + 1);
return info.getOffset() + info.getLength();
} catch (BadLocationException x) {
return fDocument.getLength();
}
}
/**
* @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent, boolean)
*/
public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent event,
boolean documentPartitioningChanged) {
if (!documentPartitioningChanged) {
try {
IRegion info = fDocument.getLineInformationOfOffset(event.getOffset());
int start = Math.max(partition.getOffset(), info.getOffset());
int end = event.getOffset()
+ (event.getText() == null ? event.getLength() : event.getText().length());
if (info.getOffset() <= end && end <= info.getOffset() + info.getLength()) {
// optimize the case of the same line
end = info.getOffset() + info.getLength();
} else {
end = endOfLineOf(end);
}
end = Math.min(partition.getOffset() + partition.getLength(), end);
return new Region(start, end - start);
} catch (BadLocationException x) {
// FIXME hu ? needs some comment
IvyPlugin.logWarn("Something bad happened", x);
}
}
return partition;
}
/**
* @see IPresentationRepairer#createPresentation(TextPresentation, ITypedRegion)
*/
public void createPresentation(TextPresentation presentation, ITypedRegion region) {
addRange(presentation, region.getOffset(), region.getLength(), fDefaultTextAttribute);
}
/**
* Adds style information to the given text presentation.
*
* @param presentation
* the text presentation to be extended
* @param offset
* the offset of the range to be styled
* @param length
* the length of the range to be styled
* @param attr
* the attribute describing the style of the range to be styled
*/
protected void addRange(TextPresentation presentation, int offset, int length,
TextAttribute attr) {
if (attr != null) {
presentation.addStyleRange(new StyleRange(offset, length, attr.getForeground(), attr
.getBackground(), attr.getStyle()));
}
}
}