/*
* JBoss by Red Hat
* Copyright 2006-2009, Red Hat Middleware, LLC, and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ide.eclipse.freemarker.editor;
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.jface.util.Assert;
import org.eclipse.swt.custom.StyleRange;
/**
* @author <a href="mailto:joe@binamics.com">Joe Hudson</a>
*/
public class NonRuleBasedDamagerRepairer
implements IPresentationDamager, IPresentationRepairer {
/** The document this object works on */
protected IDocument fDocument;
/** The default text attribute if non is returned as data by the current token */
protected 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) {
}
}
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()));
}
}