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/*******************************************************************************
* Copyright (c) 2004, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.css.ui.internal.style;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.wst.css.core.internal.parserz.CSSTextParser;
import org.eclipse.wst.css.core.internal.parserz.CSSTextToken;
import org.eclipse.wst.css.ui.internal.Logger;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;
public class LineStyleProviderForEmbeddedCSS extends LineStyleProviderForCSS {
public boolean prepareRegions(ITypedRegion typedRegion, int lineRequestStart, int lineRequestLength, Collection holdResults) {
int regionStart = typedRegion.getOffset();
int regionEnd = regionStart + typedRegion.getLength();
IStructuredDocumentRegion wholeRegion = getDocument().getRegionAtCharacterOffset(regionStart);
if (wholeRegion == null)
return false;
List tokens = null;
int offset = typedRegion.getOffset();
List cache = getCachedParsingResult(wholeRegion);
if (cache == null) {
try {
String content = getDocument().get(typedRegion.getOffset(), typedRegion.getLength());
//if region is an XML tag then in CSS style attribute, else in style tag
int mode;
if(wholeRegion.getType() == DOMRegionContext.XML_TAG_NAME) {
mode = CSSTextParser.MODE_DECLARATION;
} else {
mode = CSSTextParser.MODE_STYLESHEET;
}
CSSTextParser parser = new CSSTextParser(mode, content);
tokens = parser.getTokenList();
cacheParsingResult(wholeRegion, tokens);
} catch (BadLocationException e) {
Logger.logException("Given a bad ITypedRegion: " + typedRegion, e);
}
}
else {
tokens = cache;
}
boolean result = false;
if (tokens != null && 0 < tokens.size()) {
int start = offset;
int end = start;
Iterator i = tokens.iterator();
while (i.hasNext()) {
CSSTextToken token = (CSSTextToken) i.next();
end = start + token.length;
int styleLength = token.length;
/* The token starts in the region */
if (regionStart <= start && start < regionEnd) {
/* [239415] The region may not span the total length of the token -
* Adjust the length so that it doesn't overlap with other style ranges */
if (regionEnd < end)
styleLength = regionEnd - start;
addStyleRange(holdResults, getAttributeFor(token.kind), start, styleLength);
}
/* The region starts in the token */
else if (start <= regionStart && regionStart < end ) {
/* The token may not span the total length of the region */
if (end < regionEnd)
styleLength = end - regionStart;
else /* Bugzilla 282218 */
styleLength = regionEnd - regionStart;
addStyleRange(holdResults, getAttributeFor(token.kind), regionStart, styleLength);
}
start += token.length;
}
result = true;
}
return result;
}
private void addStyleRange(Collection holdResults, TextAttribute attribute, int start, int end) {
if (attribute != null)
holdResults.add(new StyleRange(start, end, attribute.getForeground(), attribute.getBackground(), attribute.getStyle()));
else
holdResults.add(new StyleRange(start, end, null, null));
}
protected TextAttribute getAttributeFor(ITextRegion region) {
return null;
}
private void cleanupCache() {
fCacheKey = -1;
fCacheResult = null;
}
private List getCachedParsingResult(IStructuredDocumentRegion region) {
if (fCacheKey == region.getText().hashCode()) {
return fCacheResult;
}
return null;
}
private void cacheParsingResult(IStructuredDocumentRegion region, List result) {
fCacheKey = region.getText().hashCode();
fCacheResult = result;
}
public void release() {
super.release();
cleanupCache();
}
int fCacheKey = -1;
List fCacheResult = null;
}
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