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/*******************************************************************************
* Copyright (c) 2007, 2012 QNX Software Systems 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:
* Bryan Wilkinson (QNX) - Initial API and implementation
* Anton Leherbauer (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text.contentassist;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.swt.graphics.Image;
import org.eclipse.cdt.core.dom.ast.IASTCompletionNode;
import org.eclipse.cdt.core.dom.ast.IASTFieldReference;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.model.ITranslationUnit;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.ui.IFunctionSummary;
import org.eclipse.cdt.ui.text.ICHelpInvocationContext;
import org.eclipse.cdt.ui.text.IContentAssistHelpInvocationContext;
import org.eclipse.cdt.internal.ui.CHelpProviderManager;
import org.eclipse.cdt.internal.ui.viewsupport.CElementImageProvider;
public class HelpCompletionProposalComputer extends ParsingBasedProposalComputer {
@Override
protected List<ICompletionProposal> computeCompletionProposals(
CContentAssistInvocationContext cContext,
IASTCompletionNode completionNode, String prefix)
throws CoreException {
boolean handleHelp = false;
if (completionNode != null) {
IASTName[] names = completionNode.getNames();
for (int i = 0; i < names.length; ++i) {
IASTName name = names[i];
// ignore if not connected
if (name.getTranslationUnit() == null)
continue;
// ignore if this is a member access
if (name.getParent() instanceof IASTFieldReference)
continue;
handleHelp = true;
break;
}
}
if (!handleHelp) {
return Collections.emptyList();
}
final ITranslationUnit tu = cContext.getTranslationUnit();
final IASTCompletionNode cn = completionNode;
final int cc = cContext.getInvocationOffset();
// Find matching functions
ICHelpInvocationContext helpContext = new IContentAssistHelpInvocationContext() {
@Override
public IProject getProject() {
return tu.getCProject().getProject();
}
@Override
public ITranslationUnit getTranslationUnit() {
return tu;
}
@Override
public int getInvocationOffset() {
return cc;
}
@Override
public IASTCompletionNode getCompletionNode() {
return cn;
}
};
IFunctionSummary[] summaries = CHelpProviderManager.getDefault()
.getMatchingFunctions(helpContext, prefix);
if (summaries == null)
return Collections.emptyList();
boolean doReplacement = !cContext.isContextInformationStyle();
int repLength = doReplacement ? prefix.length() : 0;
int repOffset = cContext.getInvocationOffset() - repLength;
Image image = CUIPlugin.getImageDescriptorRegistry().get(
CElementImageProvider.getFunctionImageDescriptor());
List<ICompletionProposal> proposals = new ArrayList<ICompletionProposal>();
for (IFunctionSummary summary : summaries) {
String fname = summary.getName() + "()"; //$NON-NLS-1$
String fdesc = summary.getDescription();
IFunctionSummary.IFunctionPrototypeSummary fproto = summary
.getPrototype();
String fargs = fproto.getArguments();
String repString = doReplacement ? fname : ""; //$NON-NLS-1$
int relevance = computeBaseRelevance(prefix, summary.getName()) + RelevanceConstants.HELP_TYPE_RELEVANCE;
CCompletionProposal proposal;
proposal = new CCompletionProposal(
repString,
repOffset,
repLength,
image,
fproto.getPrototypeString(true),
relevance,
cContext.getViewer());
if (fdesc != null) {
proposal.setAdditionalProposalInfo(fdesc);
}
if (!cContext.isContextInformationStyle()) {
if (fargs != null && fargs.length() > 0) {
// set the cursor before the closing bracket
proposal.setCursorPosition(fname.length() - 1);
} else {
// set the cursor behind the closing bracked
proposal.setCursorPosition(fname.length());
}
}
if (fargs != null && fargs.length() > 0) {
CProposalContextInformation info = new CProposalContextInformation(image, fname, fargs);
info.setContextInformationPosition(cContext.getContextInformationOffset());
proposal.setContextInformation(info);
}
proposals.add(proposal);
}
return proposals;
}
}
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