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/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Anton Leherbauer (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text.template;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
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.jface.text.templates.TemplateContextType;
import org.eclipse.jface.text.templates.TemplateVariableResolver;
public class TemplateVariableProcessor implements IContentAssistProcessor {
private static Comparator<TemplateVariableProposal> fgTemplateVariableProposalComparator = new Comparator<TemplateVariableProposal>() {
@Override
public int compare(TemplateVariableProposal arg0, TemplateVariableProposal arg1) {
return arg0.getDisplayString().compareTo(arg1.getDisplayString());
}
@Override
public boolean equals(Object arg0) {
return false;
}
};
/** the context type */
private TemplateContextType fContextType;
/**
* Sets the context type.
*
* @param contextType the context type
*/
public void setContextType(TemplateContextType contextType) {
fContextType = contextType;
}
/**
* Gets the context type.
*
* @return the context type
*/
public TemplateContextType getContextType() {
return fContextType;
}
/*
* @see IContentAssistProcessor#computeCompletionProposals(ITextViewer, int)
*/
@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentOffset) {
if (fContextType == null)
return null;
List<TemplateVariableProposal> proposals = new ArrayList<TemplateVariableProposal>();
String text = viewer.getDocument().get();
int start = getStart(text, documentOffset);
int end = documentOffset;
String string = text.substring(start, end);
int colon = string.indexOf(':');
boolean includeBrace = true;
int offset = start;
String prefix = string;
if (colon != -1) {
includeBrace = false;
offset = start + colon + 1;
prefix = string.substring(colon + 1);
} else {
int escape = string.indexOf("${"); //$NON-NLS-1$
if (escape != -1) {
offset = start + escape + 2;
includeBrace = false;
prefix = string.substring(escape + 2);
}
}
if (prefix.equals("$")) //$NON-NLS-1$
prefix = ""; //$NON-NLS-1$
int length = end - offset;
final Iterator<TemplateVariableResolver> resolvers = fContextType.resolvers();
while (resolvers.hasNext()) {
TemplateVariableResolver variable = resolvers.next();
if (variable.getType().startsWith(prefix))
proposals.add(new TemplateVariableProposal(variable, offset, length, viewer, includeBrace));
}
Collections.sort(proposals, fgTemplateVariableProposalComparator);
return proposals.toArray(new ICompletionProposal[proposals.size()]);
}
/* Guesses the start position of the completion */
private int getStart(String string, int end) {
int start = end;
if (start >= 1 && string.charAt(start - 1) == '$')
return start - 1;
while ((start != 0) && Character.isUnicodeIdentifierPart(string.charAt(start - 1)))
start--;
if (start >= 1 && string.charAt(start - 1) == ':') {
start--;
while ((start != 0) && Character.isUnicodeIdentifierPart(string.charAt(start - 1)))
start--;
}
if (start >= 2 && string.charAt(start - 1) == '{' && string.charAt(start - 2) == '$')
return start - 2;
return end;
}
/*
* @see IContentAssistProcessor#computeContextInformation(ITextViewer, int)
*/
@Override
public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
return null;
}
/*
* @see IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
*/
@Override
public char[] getCompletionProposalAutoActivationCharacters() {
return new char[] { '$' };
}
/*
* @see IContentAssistProcessor#getContextInformationAutoActivationCharacters()
*/
@Override
public char[] getContextInformationAutoActivationCharacters() {
return null;
}
/*
* @see IContentAssistProcessor#getErrorMessage()
*/
@Override
public String getErrorMessage() {
return null;
}
/*
* @see IContentAssistProcessor#getContextInformationValidator()
*/
@Override
public IContextInformationValidator getContextInformationValidator() {
return null;
}
}
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