package com.liferay.ide.velocity.scanner;
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;
/**
* DOCUMENT ME!
*
* @version $Revision: 13 $
* @author <a href="mailto:akmal.sarhan@gmail.com">Akmal Sarhan </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 aDefaultTextAttribute)
{
fDefaultTextAttribute = aDefaultTextAttribute;
}
/**
* @see IPresentationRepairer#setDocument(IDocument)
*/
public void setDocument(IDocument aDocument)
{
fDocument = aDocument;
}
/**
* 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 anOffset) throws BadLocationException
{
IRegion info = fDocument.getLineInformationOfOffset(anOffset);
if (anOffset <= (info.getOffset() + info.getLength())) { return info.getOffset() + info.getLength(); }
int line = fDocument.getLineOfOffset(anOffset);
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 aPartition, DocumentEvent anEvent, boolean aDocumentPartitioningChanged)
{
if (!aDocumentPartitioningChanged)
{
try
{
IRegion info = fDocument.getLineInformationOfOffset(anEvent.getOffset());
int start = Math.max(aPartition.getOffset(), info.getOffset());
int end = anEvent.getOffset() + ((anEvent.getText() == null) ? anEvent.getLength() : anEvent.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(aPartition.getOffset() + aPartition.getLength(), end);
return new Region(start, end - start);
}
catch (BadLocationException x)
{
}
}
return aPartition;
}
/**
* @see IPresentationRepairer#createPresentation(TextPresentation,
* ITypedRegion)
*/
public void createPresentation(TextPresentation aPresentation, ITypedRegion aRegion)
{
addRange(aPresentation, aRegion.getOffset(), aRegion.getLength(), fDefaultTextAttribute);
}
/**
* Adds style information to the given text presentation.
*
* @param aPresentation
* the text presentation to be extended
* @param anOffset
* the offset of the range to be styled
* @param aLength
* the length of the range to be styled
* @param anAttr
* the attribute describing the style of the range to be styled
*/
protected void addRange(TextPresentation aPresentation, int anOffset, int aLength, TextAttribute anAttr)
{
if (anAttr != null)
{
aPresentation.addStyleRange(new StyleRange(anOffset, aLength, anAttr.getForeground(), anAttr.getBackground(), anAttr.getStyle()));
}
}
}