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/*****************************************************************************
* Copyright (c) 2004 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.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.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
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);
List tokens;
int offset;
ParserCache cache = getCachedParsingResult(wholeRegion);
if (cache == null) {
offset = wholeRegion.getStartOffset();
String content;
content = wholeRegion.getText();
CSSTextParser parser = new CSSTextParser(CSSTextParser.MODE_STYLESHEET, content);
tokens = parser.getTokenList();
cacheParsingResult(wholeRegion, new ParserCache(offset, tokens));
} else {
tokens = cache.tokens;
offset = cache.offset;
}
boolean result = false;
if (0 < tokens.size()) {
int start = offset;
Iterator i = tokens.iterator();
while (i.hasNext()) {
CSSTextToken token = (CSSTextToken) i.next();
if (regionStart <= start && start < regionEnd) {
TextAttribute attribute = getAttributeFor(token.kind);
if (attribute != null) {
holdResults.add(new StyleRange(start, token.length, attribute.getForeground(), attribute.getBackground()));
}
else {
holdResults.add(new StyleRange(start, token.length, null, null));
}
}
start += token.length;
}
result = true;
}
return result;
}
protected TextAttribute getAttributeFor(ITextRegion region) {
return null;
}
private void cleanupCache() {
fCacheKey = -1;
fCacheResult = null;
}
private ParserCache getCachedParsingResult(IStructuredDocumentRegion region) {
if (fCacheKey == region.getText().hashCode()) {
return fCacheResult;
}
return null;
}
private void cacheParsingResult(IStructuredDocumentRegion region, ParserCache result) {
fCacheKey = region.getText().hashCode();
fCacheResult = result;
}
public void release() {
super.release();
cleanupCache();
}
private class ParserCache {
ParserCache(int newOffset, List newTokens) {
offset = newOffset;
tokens = newTokens;
}
int offset;
List tokens;
}
int fCacheKey = -1;
ParserCache fCacheResult = null;
}
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