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/*******************************************************************************
* Copyright (c) 2007, 2015 QNX Software Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* 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.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import org.eclipse.cdt.core.dom.ast.IASTCompletionNode;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.ui.text.contentassist.ContentAssistInvocationContext;
import org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.IContextInformation;
/**
* The base class for any proposal computers that require a completion node in
* order to determine its completion proposals.
*
* @author Bryan Wilkinson
*/
public abstract class ParsingBasedProposalComputer implements ICompletionProposalComputer {
private String fErrorMessage;
@Override
public List<ICompletionProposal> computeCompletionProposals(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
try {
if (context instanceof CContentAssistInvocationContext) {
CContentAssistInvocationContext cContext = (CContentAssistInvocationContext) context;
IASTCompletionNode completionNode = cContext.getCompletionNode();
if (completionNode == null)
return Collections.emptyList();
String prefix = completionNode.getPrefix();
if (prefix == null) {
prefix = cContext.computeIdentifierPrefix().toString();
}
return computeCompletionProposals(cContext, completionNode, prefix);
}
} catch (Exception e) {
fErrorMessage = e.toString();
CUIPlugin.log(e);
}
return Collections.emptyList();
}
protected abstract List<ICompletionProposal> computeCompletionProposals(CContentAssistInvocationContext context,
IASTCompletionNode completionNode, String prefix) throws CoreException;
@Override
public List<IContextInformation> computeContextInformation(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
Collection<ICompletionProposal> proposals = computeCompletionProposals(context, monitor);
// Remove duplicates
proposals = (new LinkedHashSet<ICompletionProposal>(proposals));
List<IContextInformation> result = new ArrayList<IContextInformation>();
for (ICompletionProposal proposal : proposals) {
IContextInformation contextInformation = proposal.getContextInformation();
if (contextInformation != null) {
result.add(contextInformation);
}
}
return result;
}
@Override
public String getErrorMessage() {
return fErrorMessage;
}
@Override
public void sessionEnded() {
}
@Override
public void sessionStarted() {
fErrorMessage = null;
}
/**
* Computes base relevance depending on quality of name / prefix match.
*
* @param prefix the completion prefix
* @param match the matching identifier
* @return a relevance value indicating the quality of the name match
*/
protected int computeBaseRelevance(String prefix, String match) {
boolean caseMatch = prefix.length() > 0 && match.startsWith(prefix);
if (caseMatch) {
return RelevanceConstants.CASE_MATCH_RELEVANCE;
}
boolean exactNameMatch = match.equalsIgnoreCase(prefix);
if (exactNameMatch) {
return RelevanceConstants.EXACT_NAME_MATCH_RELEVANCE;
}
return 0;
}
}
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