/*==========================================================================*\
| $Id: NonRuleBasedDamagerRepairer.java,v 1.1 2010/05/11 15:52:46 aallowat Exp $
|*-------------------------------------------------------------------------*|
| Copyright (C) 2006-2008 Virginia Tech
|
| This file is part of Web-CAT.
|
| Web-CAT is free software; you can redistribute it and/or modify
| it under the terms of the GNU Affero General Public License as published
| by the Free Software Foundation; either version 3 of the License, or
| (at your option) any later version.
|
| Web-CAT 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 General Public License for more details.
|
| You should have received a copy of the GNU Affero General Public License
| along with Web-CAT; if not, see <http://www.gnu.org/licenses/>.
\*==========================================================================*/
package org.webcat.oda.designer.ognl;
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;
//------------------------------------------------------------------------
/**
* TODO: real description
*
* @author Tony Allevato (Virginia Tech Computer Science)
* @version $Id: NonRuleBasedDamagerRepairer.java,v 1.1 2010/05/11 15:52:46 aallowat Exp $
*/
public class NonRuleBasedDamagerRepairer implements IPresentationDamager,
IPresentationRepairer
{
//~ Constructor ...........................................................
// ----------------------------------------------------------
/**
* Constructor for NonRuleBasedDamagerRepairer.
*
* @param defaultTextAttribute
*/
public NonRuleBasedDamagerRepairer(TextAttribute defaultTextAttribute)
{
this.defaultTextAttribute = defaultTextAttribute;
}
//~ Methods ...............................................................
// ----------------------------------------------------------
/**
* @see IPresentationRepairer#setDocument(IDocument)
*/
public void setDocument(IDocument document)
{
this.document = 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 = document.getLineInformationOfOffset(offset);
if (offset <= info.getOffset() + info.getLength())
{
return info.getOffset() + info.getLength();
}
int line = document.getLineOfOffset(offset);
try
{
info = document.getLineInformation(line + 1);
return info.getOffset() + info.getLength();
}
catch (BadLocationException x)
{
return document.getLength();
}
}
// ----------------------------------------------------------
/**
* @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent,
* boolean)
*/
public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent event,
boolean documentPartitioningChanged)
{
if (!documentPartitioningChanged)
{
try
{
IRegion info = document.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)
{
// Ignore exception.
}
}
return partition;
}
// ----------------------------------------------------------
/**
* @see IPresentationRepairer#createPresentation(TextPresentation,
* ITypedRegion)
*/
public void createPresentation(TextPresentation presentation,
ITypedRegion region)
{
addRange(presentation, region.getOffset(), region.getLength(),
defaultTextAttribute);
}
// ----------------------------------------------------------
/**
* 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()));
}
}
//~ Static/instance variables .............................................
/** The document this object works on. */
protected IDocument document;
/**
* The default text attribute if none is returned as data by the current
* token.
*/
protected TextAttribute defaultTextAttribute;
}