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/*******************************************************************************
* Copyright (c) 2008, 2012 Symbian 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:
* Andrew Ferguson (Symbian) - Initial implementation
*******************************************************************************/
package org.eclipse.cdt.ui.text.doctools.generic;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.cdt.internal.ui.text.contentassist.CCompletionProposal;
import org.eclipse.cdt.ui.text.ICPartitions;
import org.eclipse.cdt.ui.text.contentassist.ContentAssistInvocationContext;
import org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.IContextInformation;
/**
* CompletionProposalComputer based on a specified set of GenericTag objects.
* @since 5.0
* @noextend This class is not intended to be subclassed by clients.
*/
public class GenericTagCompletionProposalComputer implements ICompletionProposalComputer {
protected GenericDocTag[] tags;
protected char[] tagMarkers;
/**
* Constructs a proposal computer for the specified tags
* @param tags
*/
public GenericTagCompletionProposalComputer(GenericDocTag[] tags, char[] tagMarkers) {
this.tags = tags;
this.tagMarkers = tagMarkers;
}
/**
* @param c the character to test
* @return whether the specified character is a tag prefix marker
*/
protected boolean isTagMarker(char c) {
for (char candidate : tagMarkers)
if (c == candidate)
return true;
return false;
}
/*
* @see org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer#computeCompletionProposals(org.eclipse.cdt.ui.text.contentassist.ContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public List<ICompletionProposal> computeCompletionProposals(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
IDocument doc = context.getDocument();
int ivcOffset = context.getInvocationOffset();
try {
ITypedRegion tr = TextUtilities.getPartition(doc, ICPartitions.C_PARTITIONING, ivcOffset, false);
int firstNonWS = ivcOffset;
while (firstNonWS - 1 > tr.getOffset() && !Character.isWhitespace(doc.get(firstNonWS - 1, 1).charAt(0)))
firstNonWS--;
String prefix = doc.get(firstNonWS, ivcOffset - firstNonWS);
if (prefix.length() > 0 && isTagMarker(prefix.charAt(0))) {
List<ICompletionProposal> proposals = new ArrayList<ICompletionProposal>();
char tagMarker = prefix.charAt(0);
for (GenericDocTag tag2 : tags) {
String tag = tag2.getTagName();
if (tag.toLowerCase().startsWith(prefix.substring(1).toLowerCase())) {
CCompletionProposal proposal = new CCompletionProposal(tagMarker + tag,
ivcOffset - prefix.length(), prefix.length(), null, tagMarker + tag, 1,
context.getViewer());
String description = tag2.getTagDescription();
if (description != null && description.length() > 0) {
proposal.setAdditionalProposalInfo(description);
}
proposals.add(proposal);
}
}
return proposals;
}
} catch (BadLocationException ble) {
// offset is zero, ignore
}
return Collections.emptyList();
}
/*
* @see org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer#computeContextInformation(org.eclipse.cdt.ui.text.contentassist.ContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public List<IContextInformation> computeContextInformation(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
return Collections.emptyList();
}
/*
* @see org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer#getErrorMessage()
*/
@Override
public String getErrorMessage() {
return null;
}
/*
* @see org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer#sessionEnded()
*/
@Override
public void sessionEnded() {
}
/*
* @see org.eclipse.cdt.ui.text.contentassist.ICompletionProposalComputer#sessionStarted()
*/
@Override
public void sessionStarted() {
}
}
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