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/*******************************************************************************
* Copyright (c) 2000, 2012 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
* Sergey Prigogin (Google)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text.spelling;
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.internal.ui.text.spelling.engine.ISpellCheckEngine;
import org.eclipse.cdt.internal.ui.text.spelling.engine.ISpellChecker;
import org.eclipse.cdt.internal.ui.text.spelling.engine.RankedWordProposal;
import org.eclipse.cdt.ui.CDTSharedImages;
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.IProgressMonitor;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.IContextInformation;
/**
* Content assist processor to complete words.
* <strong>Note:</strong> This is currently not supported because the spelling engine
* cannot return word proposals but only correction proposals.
*/
public final class WordCompletionProposalComputer implements ICompletionProposalComputer {
/** The prefix rank shift */
private static final int PREFIX_RANK_SHIFT = 500;
/*
* @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#computeCompletionProposals(org.eclipse.jface.text.contentassist.TextContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public List<ICompletionProposal> computeCompletionProposals(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
if (contributes()) {
try {
IDocument document = context.getDocument();
final int offset = context.getInvocationOffset();
final IRegion region = document.getLineInformationOfOffset(offset);
final String content = document.get(region.getOffset(), region.getLength());
int index = offset - region.getOffset() - 1;
while (index >= 0 && Character.isLetter(content.charAt(index)))
index--;
final int start = region.getOffset() + index + 1;
final String candidate = content.substring(index + 1, offset - region.getOffset());
if (candidate.length() > 0) {
final ISpellCheckEngine engine = SpellCheckEngine.getInstance();
final ISpellChecker checker = engine.getSpellChecker();
if (checker != null) {
final List<RankedWordProposal> proposals = new ArrayList<RankedWordProposal>(
checker.getProposals(candidate, Character.isUpperCase(candidate.charAt(0))));
final List<ICompletionProposal> result = new ArrayList<ICompletionProposal>(proposals.size());
for (Object element : proposals) {
RankedWordProposal word = (RankedWordProposal) element;
String text = word.getText();
if (text.startsWith(candidate))
word.setRank(word.getRank() + PREFIX_RANK_SHIFT);
result.add(new CCompletionProposal(text, start, candidate.length(),
CDTSharedImages.getImage(CDTSharedImages.IMG_OBJS_CORRECTION_RENAME), text,
word.getRank()) {
/*
* @see org.eclipse.cdt.internal.ui.text.java.JavaCompletionProposal#validate(org.eclipse.jface.text.IDocument, int, org.eclipse.jface.text.DocumentEvent)
*/
@Override
public boolean validate(IDocument doc, int validate_offset, DocumentEvent event) {
return offset == validate_offset;
}
});
}
return result;
}
}
} catch (BadLocationException exception) {
// log & ignore
CUIPlugin.log(exception);
}
}
return Collections.emptyList();
}
private boolean contributes() {
return SpellingPreferences.isEnabledSpellingContentAssist();
}
/*
* @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#computeContextInformation(org.eclipse.jface.text.contentassist.TextContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
*/
@Override
public List<IContextInformation> computeContextInformation(ContentAssistInvocationContext context,
IProgressMonitor monitor) {
return Collections.emptyList();
}
/*
* @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#getErrorMessage()
*/
@Override
public String getErrorMessage() {
return null; // no error message available
}
/*
* @see org.eclipse.cdt.ui.text.java.IJavaCompletionProposalComputer#sessionStarted()
*/
@Override
public void sessionStarted() {
}
/*
* @see org.eclipse.cdt.ui.text.java.IJavaCompletionProposalComputer#sessionEnded()
*/
@Override
public void sessionEnded() {
}
}
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