| /***************************************************************************** |
| * 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; |
| } |