package org.kacprzak.eclipse.django_editor.editors.completion;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.templates.Template;
import org.eclipse.jface.text.templates.TemplateCompletionProcessor;
import org.eclipse.jface.text.templates.TemplateContextType;
import org.eclipse.swt.graphics.Image;
import org.kacprzak.eclipse.django_editor.DjangoPlugin;
import org.kacprzak.eclipse.django_editor.IDjangoImages;
import org.kacprzak.eclipse.django_editor.templates.DjangoContextType;
import org.kacprzak.eclipse.django_editor.templates.TemplateManager;
/**
* Django filters completion processor
* @author Zbigniew Kacprzak
*/
public class DjangoFilterCompletionProcessor extends TemplateCompletionProcessor
{
@Override
public char[] getCompletionProposalAutoActivationCharacters() {
return new char[] { '|' };
}
@Override
protected TemplateContextType getContextType(ITextViewer viewer, IRegion region) {
String id = DjangoContextType.DJANGO_CONTEXT_TYPE_FILTER;
return TemplateManager.getDjangoContextTypeRegistry().getContextType(id);
}
@Override
protected Image getImage(Template template) {
ImageRegistry registry = DjangoPlugin.getDefault().getImageRegistry();
return registry.get(IDjangoImages.FILTER_IMAGE);
}
@Override
protected Template[] getTemplates(String contextTypeId) {
return TemplateManager.getDjangoTemplateStore().getTemplates();
}
@Override
protected String extractPrefix(ITextViewer viewer, int offset) {
//return "";
int i= offset;
IDocument document= viewer.getDocument();
if (i > document.getLength())
return ""; //$NON-NLS-1$
try {
char ch = document.getChar(i - 1);
// if we are just after '|', replace it with selected filter
if (ch == '|')
return document.get(i-1, 1);
// remove all spaces before cursor
if (Character.isWhitespace(ch)) {
while (Character.isWhitespace(ch)) {
i--;
ch= document.getChar(i - 1);
}
return document.get(i, offset - i);
}
// replace string after '|' with filter
while (i > 0) {
ch= document.getChar(i - 1);
if (!Character.isJavaIdentifierPart(ch)) {
if (ch != '|')
return "";
i--;
break;
}
i--;
}
return document.get(i, offset - i);
} catch (BadLocationException e) {
return ""; //$NON-NLS-1$
}
}
}