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