/*******************************************************************************
* Copyright (c) 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.jst.jsp.ui.internal.contentassist;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jface.text.ITextViewer;
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.JSPTranslation;
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.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.contentassist.CompletionProposalInvocationContext;
import org.eclipse.wst.sse.ui.internal.contentassist.ContentAssistUtils;
import org.eclipse.wst.sse.ui.internal.contentassist.CustomCompletionProposal;
/**
* <p>Compute JSP EL completion proposals</p>
*/
public class JSPELCompletionProposalComputer extends
JSPJavaCompletionProposalComputer {
/**
* @see org.eclipse.jst.jsp.ui.internal.contentassist.JSPJavaCompletionProposalComputer#computeCompletionProposals(org.eclipse.wst.sse.ui.contentassist.CompletionProposalInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
*/
public List computeCompletionProposals(
CompletionProposalInvocationContext context,
IProgressMonitor monitor) {
ITextViewer viewer = context.getViewer();
int documentPosition = context.getInvocationOffset();
// get results from JSP completion processor
//3 for the "get" at the beginning of the java proposal
List results = new ArrayList(computeJavaCompletionProposals(viewer, documentPosition, 3));
//get the function proposals for syntax like: ${ fn:| }
IStructuredDocumentRegion flat = ContentAssistUtils.getStructuredDocumentRegion(viewer, documentPosition);
if (flat != null) {
ITextRegion cursorRegion = flat.getRegionAtCharacterOffset(documentPosition);
String elText;
int startOffset;
//if container then need to get inner region
//else can use flat region
if (cursorRegion instanceof ITextRegionContainer) {
ITextRegionContainer container = (ITextRegionContainer) cursorRegion;
cursorRegion = container.getRegionAtCharacterOffset(documentPosition);
elText = container.getText(cursorRegion);
startOffset = container.getStartOffset(cursorRegion);
} else {
elText = flat.getText(cursorRegion);
startOffset = flat.getStartOffset(cursorRegion);
}
//sanity check that we are actually in EL region
if (cursorRegion.getType() == DOMJSPRegionContexts.JSP_EL_CONTENT) {
String prefix = getPrefix(documentPosition - startOffset, elText);
if (null != prefix) {
List proposals = getFunctionProposals(prefix, viewer, documentPosition);
results.addAll(proposals);
}
}
}
return results;
}
/**
* @see org.eclipse.jst.jsp.ui.internal.contentassist.JSPJavaCompletionProposalComputer#getProposalCollector(
* org.eclipse.jdt.core.ICompilationUnit, org.eclipse.jst.jsp.core.internal.java.JSPTranslation)
*/
protected JSPProposalCollector getProposalCollector(ICompilationUnit cu,
JSPTranslation translation) {
return new JSPELProposalCollector(cu, translation);
}
/**
* <p>Gets the EL prefix from the relative position and the given EL text</p>
*
* @param relativePosition
* @param elText
* @return
*/
private 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;
}
/**
* <p>Get the EL function proposals, ex: ${fn:| }</p>
* @param prefix
* @param viewer
* @param offset
* @return
*/
private List getFunctionProposals(String prefix, ITextViewer viewer, int offset) {
TLDCMDocumentManager docMgr = TaglibController.getTLDCMDocumentManager(viewer.getDocument());
ArrayList completionList = new ArrayList();
if (docMgr == null)
return null;
Iterator taglibs = docMgr.getCMDocumentTrackers(offset).iterator();
while (taglibs.hasNext()) {
TaglibTracker tracker = (TaglibTracker) taglibs.next();
if (tracker.getPrefix().equals(prefix)) {
CMDocumentImpl doc = (CMDocumentImpl) tracker.getDocument();
List functions = doc.getFunctions();
for (Iterator it = functions.iterator(); it.hasNext();) {
TLDFunction function = (TLDFunction) it.next();
CustomCompletionProposal proposal = new CustomCompletionProposal(function.getName() + "()", //$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;
}
}