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/*******************************************************************************
* Copyright (c) 2005, 2006 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.jst.jsp.ui.internal.contentassist;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jst.jsp.core.internal.contentmodel.TaglibController;
import org.eclipse.jst.jsp.core.internal.contentmodel.tld.CMDocumentImpl;
import org.eclipse.jst.jsp.core.internal.contentmodel.tld.TLDCMDocumentManager;
import org.eclipse.jst.jsp.core.internal.contentmodel.tld.TaglibTracker;
import org.eclipse.jst.jsp.core.internal.contentmodel.tld.provisional.TLDFunction;
import org.eclipse.jst.jsp.core.internal.java.jspel.ASTExpression;
import org.eclipse.jst.jsp.core.internal.java.jspel.ASTFunctionInvocation;
import org.eclipse.jst.jsp.core.internal.java.jspel.FindFunctionInvocationVisitor;
import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParser;
import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParserConstants;
import org.eclipse.jst.jsp.core.internal.java.jspel.JSPELParserTokenManager;
import org.eclipse.jst.jsp.core.internal.java.jspel.ParseException;
import org.eclipse.jst.jsp.core.internal.java.jspel.SimpleCharStream;
import org.eclipse.jst.jsp.core.internal.java.jspel.Token;
import org.eclipse.jst.jsp.core.internal.regions.DOMJSPRegionContexts;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegionContainer;
import org.eclipse.wst.sse.ui.internal.StructuredTextViewer;
import org.eclipse.wst.sse.ui.internal.contentassist.ContentAssistUtils;
import org.eclipse.wst.sse.ui.internal.contentassist.CustomCompletionProposal;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;
public class JSPELContentAssistProcessor extends JSPJavaContentAssistProcessor {
protected char elCompletionProposalAutoActivationCharacters[] = new char[]{'.', ':'};
protected JSPCompletionProcessor getJspCompletionProcessor() {
if (fJspCompletionProcessor == null) {
fJspCompletionProcessor = new JSPELCompletionProcessor();
}
return fJspCompletionProcessor;
}
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentPosition) {
// get results from JSP completion processor
fJspCompletionProcessor = getJspCompletionProcessor();
ICompletionProposal[] results = fJspCompletionProcessor.computeCompletionProposals(viewer, documentPosition);
fErrorMessage = fJspCompletionProcessor.getErrorMessage();
if (results.length == 0 && (fErrorMessage == null || fErrorMessage.length() == 0)) {
fErrorMessage = UNKNOWN_CONTEXT;
}
IStructuredDocumentRegion flat = ContentAssistUtils.getStructuredDocumentRegion(viewer, documentPosition);
if (flat != null) {
ITextRegion cursorRegion = flat.getRegionAtCharacterOffset(documentPosition);
if (DOMRegionContext.XML_TAG_ATTRIBUTE_VALUE == cursorRegion.getType()) {
ITextRegionContainer container = (ITextRegionContainer) cursorRegion;
cursorRegion = container.getRegionAtCharacterOffset(documentPosition);
if (cursorRegion.getType() == DOMJSPRegionContexts.JSP_EL_CONTENT) {
String elText = container.getText(cursorRegion).trim();
String prefix = getPrefix(documentPosition - container.getStartOffset(cursorRegion) - 1, elText);
if (null != prefix) {
List proposals = getFunctionProposals(prefix, (StructuredTextViewer) viewer, documentPosition);
results = new ICompletionProposal[proposals.size()];
proposals.toArray(results);
}
}
}
}
return results;
}
protected String getPrefix(int relativePosition, String elText) {
java.io.StringReader reader = new java.io.StringReader(elText);
JSPELParserTokenManager scanner = new JSPELParserTokenManager(new SimpleCharStream(reader, 1, 1));
Token curToken = null, lastIdentifier = null;
while (JSPELParserConstants.EOF != (curToken = scanner.getNextToken()).kind) {
if (JSPELParserConstants.COLON == curToken.kind && curToken.endColumn == relativePosition && null != lastIdentifier) {
return (lastIdentifier.image);
}
if (JSPELParserConstants.IDENTIFIER == curToken.kind) {
lastIdentifier = curToken;
}
else {
lastIdentifier = null;
}
}
return null;
}
protected ASTFunctionInvocation getInvocation(int relativePosition, String elText) {
FindFunctionInvocationVisitor visitor = new FindFunctionInvocationVisitor(relativePosition);
JSPELParser parser = JSPELParser.createParser(elText);
try {
ASTExpression expression = parser.Expression();
return (ASTFunctionInvocation) expression.jjtAccept(visitor, null);
}
catch (ParseException e) { /* parse exception = no completion */
}
return (null);
}
public char[] getCompletionProposalAutoActivationCharacters() {
return elCompletionProposalAutoActivationCharacters;
}
protected List getFunctionProposals(String prefix, StructuredTextViewer viewer, int offset) {
TLDCMDocumentManager docMgr = TaglibController.getTLDCMDocumentManager(viewer.getDocument());
ArrayList completionList = new ArrayList();
if (docMgr == null)
return null;
Iterator taglibs = docMgr.getCMDocumentTrackers(offset).iterator();
while (taglibs.hasNext()) {
TaglibTracker tracker = (TaglibTracker) taglibs.next();
if (tracker.getPrefix().equals(prefix)) {
CMDocumentImpl doc = (CMDocumentImpl) tracker.getDocument();
List functions = doc.getFunctions();
for (Iterator it = functions.iterator(); it.hasNext();) {
TLDFunction function = (TLDFunction) it.next();
CustomCompletionProposal proposal = new CustomCompletionProposal(function.getName() + "()", //$NON-NLS-1$
offset, 0, function.getName().length() + 1, null, function.getName() + " - " + function.getSignature(), null, null, 1); //$NON-NLS-1$
completionList.add(proposal);
}
}
}
return completionList;
}
}
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