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/*******************************************************************************
* Copyright (c) 2004, 2006 IBM Corporation 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
*
* Contributors:
* IBM - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.text.contentassist;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.cdt.core.dom.ast.ASTCompletionNode;
import org.eclipse.cdt.core.model.IWorkingCopy;
import org.eclipse.cdt.internal.ui.CUIMessages;
import org.eclipse.cdt.internal.ui.preferences.ProposalFilterPreferencesUtil;
import org.eclipse.cdt.internal.ui.text.CParameterListValidator;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.ui.text.ICCompletionProposal;
import org.eclipse.cdt.ui.text.contentassist.ICompletionContributor;
import org.eclipse.cdt.ui.text.contentassist.IProposalFilter;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.InvalidRegistryObjectException;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.text.BadLocationException;
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.ui.IEditorPart;
/**
* @author Doug Schaefer
*/
public class CCompletionProcessor2 implements IContentAssistProcessor {
private IEditorPart editor;
private String errorMessage;
private char[] autoActivationChars;
// Property names
private String assistPrefix = "CEditor.contentassist"; //$NON-NLS-1$
private String noCompletions = assistPrefix + ".noCompletions"; //$NON-NLS-1$
private ASTCompletionNode fCurrentCompletionNode;
public CCompletionProcessor2(IEditorPart editor) {
this.editor = editor;
fCurrentCompletionNode = null;
}
public ICompletionProposal[] computeCompletionProposals(final ITextViewer viewer, int offset) {
try {
IWorkingCopy workingCopy = CUIPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(editor.getEditorInput());
String prefix = null;
if (workingCopy != null) {
fCurrentCompletionNode = workingCopy.getLanguage().getCompletionNode(workingCopy, offset);
if (fCurrentCompletionNode != null)
prefix = fCurrentCompletionNode.getPrefix();
}
if (prefix == null)
prefix = scanPrefix(viewer.getDocument(), offset);
errorMessage = CUIMessages.getString(noCompletions);
List proposals = new ArrayList();
IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(CUIPlugin.PLUGIN_ID, "completionContributors"); //$NON-NLS-1$
if (point == null)
return null;
IExtension[] extensions = point.getExtensions();
for (int i = 0; i < extensions.length; ++i) {
IConfigurationElement[] elements = extensions[i].getConfigurationElements();
for (int j = 0; j < elements.length; ++j) {
IConfigurationElement element = elements[j];
if (!"contributor".equals(element.getName())) //$NON-NLS-1$
continue;
Object contribObject = element.createExecutableExtension("class"); //$NON-NLS-1$
if (!(contribObject instanceof ICompletionContributor))
continue;
ICompletionContributor contributor = (ICompletionContributor)contribObject;
contributor.contributeCompletionProposals(viewer, offset, workingCopy, fCurrentCompletionNode, prefix, proposals);
}
}
IProposalFilter filter = getCompletionFilter();
ICCompletionProposal[] proposalsInput = (ICCompletionProposal[]) proposals.toArray(new ICCompletionProposal[proposals.size()]) ;
ICCompletionProposal[] proposalsFiltered = filter.filterProposals(proposalsInput);
return proposalsFiltered;
} catch (Throwable e) {
errorMessage = e.toString();
}
return null;
}
private IProposalFilter getCompletionFilter() {
IProposalFilter filter = null;
try {
IConfigurationElement filterElement = ProposalFilterPreferencesUtil.getPreferredFilterElement();
if (null != filterElement) {
Object contribObject = filterElement
.createExecutableExtension("class"); //$NON-NLS-1$
if ((contribObject instanceof IProposalFilter)) {
filter = (IProposalFilter) contribObject;
}
}
} catch (InvalidRegistryObjectException e) {
// No action required since we will be using the fail-safe default filter
CUIPlugin.getDefault().log(e);
} catch (CoreException e) {
// No action required since we will be using the fail-safe default filter
CUIPlugin.getDefault().log(e);
}
if (null == filter) {
// fail-safe default implementation
filter = new DefaultProposalFilter();
}
return filter;
}
private String scanPrefix(IDocument document, int end) {
try {
int start = end;
while ((start != 0) && Character.isUnicodeIdentifierPart(document.getChar(start - 1)))
start--;
if ((start != 0) && Character.isUnicodeIdentifierStart(document.getChar(start - 1)))
start--;
return document.get(start, end - start);
} catch (BadLocationException e) {
return null;
}
}
public IContextInformation[] computeContextInformation(ITextViewer viewer,
int offset) {
// TODO Auto-generated method stub
return null;
}
public char[] getCompletionProposalAutoActivationCharacters() {
return autoActivationChars;
}
public void setCompletionProposalAutoActivationCharacters(char[] autoActivationChars) {
this.autoActivationChars = autoActivationChars;
}
public char[] getContextInformationAutoActivationCharacters() {
return null; // none
}
public String getErrorMessage() {
return errorMessage;
}
public IContextInformationValidator getContextInformationValidator() {
return new CParameterListValidator();
}
public void orderProposalsAlphabetically(boolean order) {
}
public void allowAddingIncludes(boolean allowAddingIncludes) {
}
/**
* @return the fCurrentCompletionNode
*/
public ASTCompletionNode getCurrentCompletionNode() {
return fCurrentCompletionNode;
}
}
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