<extension
         point="org.eclipse.ui.editors">
         <editor
            name="T Language Editor"
            extensions="t"
            icon="icons/sample.gif"
            contributorClass="org.eclipse.ui.texteditor.BasicTextEditorActionContributor"
            class="com.acme.t.editors.TEditor"
            id="com.acme.t.editors.TEditor"/>
   </extension>

public class TEditor extends TextEditor {

   private ColorCache colorCache;
   private TEditConfiguration editConfiguration;

   public TEditor()
   {
      super();

      IPreferenceStore preferences = Activator.getDefault().getPreferenceStore();
      colorCache = new ColorCache();

      editConfiguration = new TEditConfiguration(colorCache, this,  preferences);

      setSourceViewerConfiguration(editConfiguration);
      setDocumentProvider(new TDocumentProvider());

      // enable standard vertical ruler
      setRangeIndicator(new DefaultRangeIndicator());
   }

<!-- document provider (even for the external files) -->
   <extension point="org.eclipse.ui.editors.documentProviders">
      <provider
            class="org.eclipse.ui.editors.text.TextFileDocumentProvider"
            inputTypes="org.eclipse.ui.IStorageEditorInput"
            id="org.eclipse.ui.editors.text.StorageDocumentProvider"/>
      <provider
            class="com.acme.t.editors.TDocumentProvider"
            id="com.acme.t.editors.TDocumentProvider"
            extensions=".t"/>
   </extension>
   <extension
         id = "TDocumentSetupParticipant"
         point = "org.eclipse.core.filebuffers.documentSetup">
      <participant
            class="com.acme.t.editors.TDocumentSetupParticipant"
            extensions="t"/>
   </extension>

<!-- T file content type, so that it is treated as text -->
  <extension point="org.eclipse.core.contenttype.contentTypes">
      <content-type
            file-extensions="t"
            name="T Source File"
            id="tfile"
            base-type="org.eclipse.core.runtime.text"/>
   </extension>
   

  private void open(EditorHistoryItem item) {
        IWorkbenchPage page = window.getActivePage();
        if (page != null) {
            try {
                String itemName = item.getName();
                if (!item.isRestored()) {
                    item.restoreState();
                }
                IEditorInput input = item.getInput();
                IEditorDescriptor desc = item.getDescriptor();
                if (input == null || desc == null) {
                    String title = WorkbenchMessages.OpenRecent_errorTitle;
                    String msg = NLS.bind(WorkbenchMessages.OpenRecent_unableToOpen,  itemName ); 
                    MessageDialog.openWarning(window.getShell(), title, msg);
                    history.remove(item);
                } else {
                    page.openEditor(input, desc.getId());
                }
            } catch (PartInitException e2) {
                String title = WorkbenchMessages.OpenRecent_errorTitle;
                MessageDialog.openWarning(window.getShell(), title, e2
                        .getMessage());
                history.remove(item);
            }
        }
    }

  public IPresentationReconciler getPresentationReconciler(ISourceViewer sourceViewer) {

        if (reconciler == null) {
            reconciler = new PresentationReconciler();
            reconciler.setDocumentPartitioning(TPartitions.T_PARTITION_TYPE);

            DefaultDamagerRepairer dr;

            // DefaultDamagerRepairer implements both IPresentationDamager, IPresentationRepairer
            // IPresentationDamager::getDamageRegion does not scan, just
            // returns the intersection of document event, and partition region
            // IPresentationRepairer::createPresentation scans
            // gets each token, and sets text attributes according to token

            // We need to cover all the content types from FastTPartitionScanner
            // Comments have uniform color
            commentScanner = new TColoredScanner(colorCache, new RGB(0, 192, 0), SWT.NORMAL);
            dr = new DefaultDamagerRepairer(commentScanner);
            reconciler.setDamager(dr, TPartitions.T_COMMENT);
            reconciler.setRepairer(dr, TPartitions.T_COMMENT);

            // Strings have uniform color
            stringScanner = new TColoredScanner(colorCache, new RGB(0, 0, 192), SWT.NORMAL);
            dr = new DefaultDamagerRepairer(stringScanner);
            reconciler.setDamager(dr, TPartitions.T_STRING);
            reconciler.setRepairer(dr, TPartitions.T_STRING);

            // Default content is code, we need syntax highlighting
            codeScanner = new TCodeScanner(colorCache);
            dr = new DefaultDamagerRepairer(codeScanner);
            reconciler.setDamager(dr, IDocument.DEFAULT_CONTENT_TYPE);
            reconciler.setRepairer(dr, IDocument.DEFAULT_CONTENT_TYPE);
        }

        return reconciler;
    }