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/*******************************************************************************
* Copyright (c) 2005, 2018 IBM Corporation 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:
* IBM Corporation - initial API and implementation
* Bjorn Freeman-Benson - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.examples.ui.pda.editor;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.CompletionProposal;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jface.text.contentassist.IContextInformationValidator;
public class PDAContentAssistProcessor implements IContentAssistProcessor {
@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
int index = offset - 1;
StringBuilder prefix = new StringBuilder();
IDocument document = viewer.getDocument();
while (index > 0) {
try {
char prev = document.getChar(index);
if (Character.isWhitespace(prev)) {
break;
}
prefix.insert(0, prev);
index--;
} catch (BadLocationException e) {
}
}
List<CompletionProposal> proposals = new ArrayList<>();
String[] keywords = PDAScanner.fgKeywords;
if (prefix.length() > 0) {
String word = prefix.toString();
for (int i = 0; i < keywords.length; i++) {
String keyword = keywords[i];
if (keyword.startsWith(word) && word.length() < keyword.length()) {
proposals.add(new CompletionProposal(keyword + " ", index + 1, offset - (index + 1), keyword.length() + 1)); //$NON-NLS-1$
}
}
} else {
// propose all keywords
for (int i = 0; i < keywords.length; i++) {
String keyword = keywords[i];
proposals.add(new CompletionProposal(keyword + " ", offset, 0, keyword.length() + 1)); //$NON-NLS-1$
}
}
if (!proposals.isEmpty()) {
return proposals.toArray(new ICompletionProposal[proposals.size()]);
}
return null;
}
@Override
public IContextInformation[] computeContextInformation(ITextViewer viewer, int offset) {
return null;
}
@Override
public char[] getCompletionProposalAutoActivationCharacters() {
return null;
}
@Override
public char[] getContextInformationAutoActivationCharacters() {
return null;
}
@Override
public String getErrorMessage() {
return null;
}
@Override
public IContextInformationValidator getContextInformationValidator() {
return null;
}
}
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