package tk.eclipse.plugin.htmleditor.template;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.templates.Template;
import org.eclipse.jface.text.templates.TemplateCompletionProcessor;
import org.eclipse.jface.text.templates.TemplateContext;
import org.eclipse.jface.text.templates.TemplateContextType;
import org.eclipse.jface.text.templates.TemplateException;
import org.eclipse.swt.graphics.Image;
import tk.eclipse.plugin.htmleditor.HTMLPlugin;
/**
*
* @author Naoki Takezoe
*/
public class HTMLTemplateAssistProcessor extends TemplateCompletionProcessor {
protected Template[] getTemplates(String contextTypeId) {
HTMLTemplateManager manager = HTMLTemplateManager.getInstance();
return manager.getTemplateStore().getTemplates();
}
protected TemplateContextType getContextType(ITextViewer viewer, IRegion region) {
HTMLTemplateManager manager = HTMLTemplateManager.getInstance();
return manager.getContextTypeRegistry().getContextType(HTMLContextType.CONTEXT_TYPE);
}
protected Image getImage(Template template) {
return HTMLPlugin.getDefault().getImageRegistry().get(HTMLPlugin.ICON_TEMPLATE);
}
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
ITextSelection selection= (ITextSelection) viewer.getSelectionProvider().getSelection();
// adjust offset to end of normalized selection
if (selection.getOffset() == offset)
offset= selection.getOffset() + selection.getLength();
String prefix= extractPrefix(viewer, offset);
Region region= new Region(offset - prefix.length(), prefix.length());
TemplateContext context= createContext(viewer, region);
if (context == null)
return new ICompletionProposal[0];
context.setVariable("selection", selection.getText()); // name of the selection variables {line, word}_selection //$NON-NLS-1$
Template[] templates= getTemplates(context.getContextType().getId());
List matches= new ArrayList();
for (int i= 0; i < templates.length; i++) {
Template template= templates[i];
try {
context.getContextType().validate(template.getPattern());
} catch (TemplateException e) {
continue;
}
if (template.getName().startsWith(prefix) &&
template.matches(prefix, context.getContextType().getId()))
matches.add(createProposal(template, context, (IRegion) region, getRelevance(template, prefix)));
}
return (ICompletionProposal[]) matches.toArray(new ICompletionProposal[matches.size()]);
}
}