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/*******************************************************************************
* Copyright (c) 2015, 2017 Open Analytics NV 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
*******************************************************************************/
package org.eclipse.linuxtools.internal.docker.editor.assist;
import java.util.ArrayList;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
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;
import org.eclipse.linuxtools.internal.docker.editor.Activator;
import org.eclipse.linuxtools.internal.docker.editor.scanner.InstructionWordRule;
import org.eclipse.linuxtools.internal.docker.editor.util.AssetLoader;
public class CompletionProcessor implements IContentAssistProcessor {
private static final ICompletionProposal[] NO_COMPLETIONS = {};
private static final IContextInformation[] NO_CONTEXTS = {};
private static final char[] PROPOSAL_ACTIVATION_CHARS = {};
private static final char[] INFO_ACTIVATION_CHARS = {};
private AssetLoader assetLoader;
public CompletionProcessor() {
assetLoader = new AssetLoader();
}
@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
try {
IDocument document = viewer.getDocument();
ArrayList<ICompletionProposal> result = new ArrayList<>();
int lineNr = document.getLineOfOffset(offset);
int lineOffset = document.getLineOffset(lineNr);
boolean isNewLine = (offset == 0) || (document.getChar(offset - 1) == '\n');
if (isNewLine) {
for (String instr : InstructionWordRule.INSTRUCTIONS)
result.add(new CompletionProposal(instr, lineOffset, 0, assetLoader.getInfo(instr)));
}
boolean isFirstWord = true;
for (int i = lineOffset; i < offset; i++) {
if (Character.isWhitespace(document.getChar(i)))
isFirstWord = false;
}
if (isFirstWord) {
String prefix = "";
for (int i = lineOffset; i < offset; i++)
prefix += document.getChar(i);
for (String instr : InstructionWordRule.INSTRUCTIONS) {
if (instr.toLowerCase().startsWith(prefix.toLowerCase()))
result.add(
new CompletionProposal(instr, lineOffset, prefix.length(), assetLoader.getInfo(instr)));
}
}
return result.toArray(new ICompletionProposal[result.size()]);
} catch (Exception e) {
Activator.getDefault().getLog()
.log(new Status(IStatus.WARNING, Activator.PLUGIN_ID, "Failed to compute completion proposals", e));
return NO_COMPLETIONS;
}
}
@Override
public IContextInformation[] computeContextInformation(ITextViewer viewer, int offset) {
return NO_CONTEXTS;
}
@Override
public char[] getCompletionProposalAutoActivationCharacters() {
return PROPOSAL_ACTIVATION_CHARS;
}
@Override
public char[] getContextInformationAutoActivationCharacters() {
return INFO_ACTIVATION_CHARS;
}
@Override
public String getErrorMessage() {
return "";
}
@Override
public IContextInformationValidator getContextInformationValidator() {
return null;
}
}
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