net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/template/contentassist/TemplateProposal.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text.template.contentassist;
  12
  13 import net.sourceforge.phpdt.internal.corext.template.php.CompilationUnitContext;
  14 import net.sourceforge.phpdt.internal.corext.template.php.JavaContext;
  15 import net.sourceforge.phpdt.internal.ui.text.java.IPHPCompletionProposal;
  16 import net.sourceforge.phpdt.internal.ui.util.ExceptionHandler;
  17 //import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  18 import net.sourceforge.phpeclipse.phpeditor.EditorHighlightingSynchronizer;
  19 import net.sourceforge.phpeclipse.phpeditor.PHPEditor;
  20 import net.sourceforge.phpeclipse.ui.WebUI;
  21
  22 import org.eclipse.core.runtime.CoreException;
  23 import org.eclipse.core.runtime.IStatus;
  24 import org.eclipse.core.runtime.Status;
  25 import org.eclipse.jface.dialogs.MessageDialog;
  26 //incastrix
  27 //import org.eclipse.jface.text.Assert;
  28 import org.eclipse.core.runtime.Assert;
  29 import org.eclipse.jface.text.BadLocationException;
  30 import org.eclipse.jface.text.BadPositionCategoryException;
  31 import org.eclipse.jface.text.DocumentEvent;
  32 import org.eclipse.jface.text.IDocument;
  33 import org.eclipse.jface.text.IInformationControlCreator;
  34 import org.eclipse.jface.text.IRegion;
  35 import org.eclipse.jface.text.ITextViewer;
  36 import org.eclipse.jface.text.Position;
  37 import org.eclipse.jface.text.Region;
  38 import org.eclipse.jface.text.contentassist.ICompletionProposal;
  39 import org.eclipse.jface.text.contentassist.ICompletionProposalExtension2;
  40 import org.eclipse.jface.text.contentassist.ICompletionProposalExtension3;
  41 import org.eclipse.jface.text.contentassist.IContextInformation;
  42 import org.eclipse.jface.text.link.ILinkedModeListener;
  43 import org.eclipse.jface.text.link.LinkedModeModel;
  44 import org.eclipse.jface.text.link.LinkedModeUI;
  45 import org.eclipse.jface.text.link.LinkedPosition;
  46 import org.eclipse.jface.text.link.LinkedPositionGroup;
  47 import org.eclipse.jface.text.link.ProposalPosition;
  48 import org.eclipse.jface.text.templates.DocumentTemplateContext;
  49 import org.eclipse.jface.text.templates.GlobalTemplateVariables;
  50 import org.eclipse.jface.text.templates.Template;
  51 import org.eclipse.jface.text.templates.TemplateBuffer;
  52 import org.eclipse.jface.text.templates.TemplateContext;
  53 import org.eclipse.jface.text.templates.TemplateException;
  54 import org.eclipse.jface.text.templates.TemplateVariable;
  55 import org.eclipse.swt.graphics.Image;
  56 import org.eclipse.swt.graphics.Point;
  57 import org.eclipse.swt.widgets.Shell;
  58 import org.eclipse.ui.IEditorPart;
  59 import org.eclipse.ui.texteditor.link.EditorLinkedModeUI;
  60
  61 /**
  62  * A template proposal.
  63  */
  64 public class TemplateProposal implements IPHPCompletionProposal,
  65                 ICompletionProposalExtension2, ICompletionProposalExtension3 {
  66
  67         private final Template fTemplate;
  68
  69         private final TemplateContext fContext;
  70
  71         private final Image fImage;
  72
  73         private IRegion fRegion;
  74
  75         private int fRelevance;
  76
  77         private IRegion fSelectedRegion; // initialized by apply()
  78
  79         private String fDisplayString;
  80
  81         /**
  82          * Creates a template proposal with a template and its context.
  83          *
  84          * @param template
  85          *            the template
  86          * @param context
  87          *            the context in which the template was requested
  88          * @param region
  89          *            the region this proposal applies to
  90          * @param image
  91          *            the icon of the proposal
  92          */
  93         public TemplateProposal(Template template, TemplateContext context,
  94                         IRegion region, Image image) {
  95                 Assert.isNotNull(template);
  96                 Assert.isNotNull(context);
  97                 Assert.isNotNull(region);
  98
  99                 fTemplate = template;
 100                 fContext = context;
 101                 fImage = image;
 102                 fRegion = region;
 103
 104                 fDisplayString = null;
 105
 106                 if (context instanceof JavaContext) {
 107                         switch (((JavaContext) context).getCharacterBeforeStart()) {
 108                         // high relevance after whitespace
 109                         case ' ':
 110                         case '\r':
 111                         case '\n':
 112                         case '\t':
 113                                 fRelevance = 90;
 114                                 break;
 115                         default:
 116                                 fRelevance = 0;
 117                         }
 118                 } else {
 119                         fRelevance = 90;
 120                 }
 121         }
 122
 123         /*
 124          * @see ICompletionProposal#apply(IDocument)
 125          */
 126         public final void apply(IDocument document) {
 127                 // not called anymore
 128         }
 129
 130         /*
 131          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#apply(org.eclipse.jface.text.ITextViewer,
 132          *      char, int, int)
 133          */
 134         public void apply(ITextViewer viewer, char trigger, int stateMask,
 135                         int offset) {
 136
 137                 try {
 138
 139                         fContext.setReadOnly(false);
 140                         TemplateBuffer templateBuffer;
 141                         try {
 142                                 templateBuffer = fContext.evaluate(fTemplate);
 143                         } catch (TemplateException e1) {
 144                                 fSelectedRegion = fRegion;
 145                                 return;
 146                         }
 147
 148                         int start = getReplaceOffset();
 149                         int end = getReplaceEndOffset();
 150                         end = Math.max(end, offset);
 151
 152                         // insert template string
 153                         IDocument document = viewer.getDocument();
 154                         String templateString = templateBuffer.getString();
 155                         document.replace(start, end - start, templateString);
 156
 157                         // translate positions
 158                         LinkedModeModel model = new LinkedModeModel();
 159                         TemplateVariable[] variables = templateBuffer.getVariables();
 160
 161                         MultiVariableGuess guess = fContext instanceof CompilationUnitContext ? ((CompilationUnitContext) fContext)
 162                                         .getMultiVariableGuess()
 163                                         : null;
 164
 165                         boolean hasPositions = false;
 166                         for (int i = 0; i != variables.length; i++) {
 167                                 TemplateVariable variable = variables[i];
 168
 169                                 if (variable.isUnambiguous())
 170                                         continue;
 171
 172                                 LinkedPositionGroup group = new LinkedPositionGroup();
 173
 174                                 int[] offsets = variable.getOffsets();
 175                                 int length = variable.getLength();
 176
 177                                 LinkedPosition first;
 178                                 if (guess != null && variable instanceof MultiVariable) {
 179                                         first = new VariablePosition(document, offsets[0] + start,
 180                                                         length, guess, (MultiVariable) variable);
 181                                         guess.addSlave((VariablePosition) first);
 182                                 } else {
 183                                         String[] values = variable.getValues();
 184                                         ICompletionProposal[] proposals = new ICompletionProposal[values.length];
 185                                         for (int j = 0; j < values.length; j++) {
 186                                                 ensurePositionCategoryInstalled(document, model);
 187                                                 Position pos = new Position(offsets[0] + start, length);
 188                                                 document.addPosition(getCategory(), pos);
 189                                                 proposals[j] = new PositionBasedCompletionProposal(
 190                                                                 values[j], pos, length);
 191                                         }
 192
 193                                         if (proposals.length > 1)
 194                                                 first = new ProposalPosition(document, offsets[0]
 195                                                                 + start, length, proposals);
 196                                         else
 197                                                 first = new LinkedPosition(document,
 198                                                                 offsets[0] + start, length);
 199                                 }
 200
 201                                 for (int j = 0; j != offsets.length; j++)
 202                                         if (j == 0)
 203                                                 group.addPosition(first);
 204                                         else
 205                                                 group.addPosition(new LinkedPosition(document,
 206                                                                 offsets[j] + start, length));
 207
 208                                 model.addGroup(group);
 209                                 hasPositions = true;
 210                         }
 211
 212                         if (hasPositions) {
 213                                 model.forceInstall();
 214                                 PHPEditor editor = getJavaEditor();
 215                                 if (editor != null) {
 216                                         model
 217                                                         .addLinkingListener(new EditorHighlightingSynchronizer(
 218                                                                         editor));
 219                                 }
 220
 221                                 LinkedModeUI ui = new EditorLinkedModeUI(model, viewer);
 222                                 ui.setExitPosition(viewer, getCaretOffset(templateBuffer)
 223                                                 + start, 0, Integer.MAX_VALUE);
 224                                 ui.enter();
 225
 226                                 fSelectedRegion = ui.getSelectedRegion();
 227                         } else
 228                                 fSelectedRegion = new Region(getCaretOffset(templateBuffer)
 229                                                 + start, 0);
 230
 231                 } catch (BadLocationException e) {
 232                         WebUI.log(e);
 233                         openErrorDialog(viewer.getTextWidget().getShell(), e);
 234                         fSelectedRegion = fRegion;
 235                 } catch (BadPositionCategoryException e) {
 236                         WebUI.log(e);
 237                         openErrorDialog(viewer.getTextWidget().getShell(), e);
 238                         fSelectedRegion = fRegion;
 239                 }
 240
 241         }
 242
 243         /**
 244          * Returns the currently active java editor, or <code>null</code> if it
 245          * cannot be determined.
 246          *
 247          * @return the currently active java editor, or <code>null</code>
 248          */
 249         private PHPEditor getJavaEditor() {
 250                 IEditorPart part = WebUI.getActivePage().getActiveEditor();
 251                 if (part instanceof PHPEditor)
 252                         return (PHPEditor) part;
 253                 else
 254                         return null;
 255         }
 256
 257         /**
 258          * Returns the offset of the range in the document that will be replaced by
 259          * applying this template.
 260          *
 261          * @return the offset of the range in the document that will be replaced by
 262          *         applying this template
 263          */
 264         private int getReplaceOffset() {
 265                 int start;
 266                 if (fContext instanceof DocumentTemplateContext) {
 267                         DocumentTemplateContext docContext = (DocumentTemplateContext) fContext;
 268                         start = docContext.getStart();
 269                 } else {
 270                         start = fRegion.getOffset();
 271                 }
 272                 return start;
 273         }
 274
 275         /**
 276          * Returns the end offset of the range in the document that will be replaced
 277          * by applying this template.
 278          *
 279          * @return the end offset of the range in the document that will be replaced
 280          *         by applying this template
 281          */
 282         private int getReplaceEndOffset() {
 283                 int end;
 284                 if (fContext instanceof DocumentTemplateContext) {
 285                         DocumentTemplateContext docContext = (DocumentTemplateContext) fContext;
 286                         end = docContext.getEnd();
 287                 } else {
 288                         end = fRegion.getOffset() + fRegion.getLength();
 289                 }
 290                 return end;
 291         }
 292
 293         private void ensurePositionCategoryInstalled(final IDocument document,
 294                         LinkedModeModel model) {
 295                 if (!document.containsPositionCategory(getCategory())) {
 296                         document.addPositionCategory(getCategory());
 297                         final InclusivePositionUpdater updater = new InclusivePositionUpdater(
 298                                         getCategory());
 299                         document.addPositionUpdater(updater);
 300
 301                         model.addLinkingListener(new ILinkedModeListener() {
 302
 303                                 /*
 304                                  * @see org.eclipse.jface.text.link.ILinkedModeListener#left(org.eclipse.jface.text.link.LinkedModeModel,
 305                                  *      int)
 306                                  */
 307                                 public void left(LinkedModeModel environment, int flags) {
 308                                         try {
 309                                                 document.removePositionCategory(getCategory());
 310                                         } catch (BadPositionCategoryException e) {
 311                                                 // ignore
 312                                         }
 313                                         document.removePositionUpdater(updater);
 314                                 }
 315
 316                                 public void suspend(LinkedModeModel environment) {
 317                                 }
 318
 319                                 public void resume(LinkedModeModel environment, int flags) {
 320                                 }
 321                         });
 322                 }
 323         }
 324
 325         private String getCategory() {
 326                 return "TemplateProposalCategory_" + toString(); //$NON-NLS-1$
 327         }
 328
 329         private int getCaretOffset(TemplateBuffer buffer) {
 330
 331                 TemplateVariable[] variables = buffer.getVariables();
 332                 for (int i = 0; i != variables.length; i++) {
 333                         TemplateVariable variable = variables[i];
 334                         if (variable.getType().equals(GlobalTemplateVariables.Cursor.NAME))
 335                                 return variable.getOffsets()[0];
 336                 }
 337
 338                 return buffer.getString().length();
 339         }
 340
 341         /*
 342          * @see ICompletionProposal#getSelection(IDocument)
 343          */
 344         public Point getSelection(IDocument document) {
 345                 return new Point(fSelectedRegion.getOffset(), fSelectedRegion
 346                                 .getLength());
 347         }
 348
 349         /*
 350          * @see ICompletionProposal#getAdditionalProposalInfo()
 351          */
 352         public String getAdditionalProposalInfo() {
 353                 try {
 354                         fContext.setReadOnly(true);
 355                         TemplateBuffer templateBuffer;
 356                         try {
 357                                 templateBuffer = fContext.evaluate(fTemplate);
 358                         } catch (TemplateException e1) {
 359                                 return null;
 360                         }
 361
 362                         return templateBuffer.getString();
 363
 364                 } catch (BadLocationException e) {
 365                         handleException(WebUI.getActiveWorkbenchShell(),
 366                                         new CoreException(new Status(IStatus.ERROR,
 367                                                         WebUI.getPluginId(), IStatus.OK, "", e))); //$NON-NLS-1$
 368                         return null;
 369                 }
 370         }
 371
 372         /*
 373          * @see ICompletionProposal#getDisplayString()
 374          */
 375         public String getDisplayString() {
 376                 if (fDisplayString == null) {
 377                         fDisplayString = fTemplate.getName()
 378                                         + TemplateContentAssistMessages
 379                                                         .getString("TemplateProposal.delimiter") + fTemplate.getDescription(); //$NON-NLS-1$
 380                 }
 381                 return fDisplayString;
 382         }
 383
 384 //      public void setDisplayString(String displayString) {
 385 //              fDisplayString = displayString;
 386 //      }
 387
 388         /*
 389          * @see ICompletionProposal#getImage()
 390          */
 391         public Image getImage() {
 392                 return fImage;
 393         }
 394
 395         /*
 396          * @see ICompletionProposal#getContextInformation()
 397          */
 398         public IContextInformation getContextInformation() {
 399                 return null;
 400         }
 401
 402         private void openErrorDialog(Shell shell, Exception e) {
 403                 MessageDialog.openError(shell, TemplateContentAssistMessages
 404                                 .getString("TemplateEvaluator.error.title"), e.getMessage()); //$NON-NLS-1$
 405         }
 406
 407         private void handleException(Shell shell, CoreException e) {
 408                 ExceptionHandler.handle(e, shell, TemplateContentAssistMessages
 409                                 .getString("TemplateEvaluator.error.title"), null); //$NON-NLS-1$
 410         }
 411
 412         /*
 413          * @see IJavaCompletionProposal#getRelevance()
 414          */
 415         public int getRelevance() {
 416                 return fRelevance;
 417         }
 418
 419 //      public void setRelevance(int relevance) {
 420 //              fRelevance = relevance;
 421 //      }
 422
 423 //      public Template getTemplate() {
 424 //              return fTemplate;
 425 //      }
 426
 427         /*
 428          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension3#getInformationControlCreator()
 429          */
 430         public IInformationControlCreator getInformationControlCreator() {
 431                 return new TemplateInformationControlCreator();
 432         }
 433
 434         /*
 435          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#selected(org.eclipse.jface.text.ITextViewer,
 436          *      boolean)
 437          */
 438         public void selected(ITextViewer viewer, boolean smartToggle) {
 439         }
 440
 441         /*
 442          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#unselected(org.eclipse.jface.text.ITextViewer)
 443          */
 444         public void unselected(ITextViewer viewer) {
 445         }
 446
 447         /*
 448          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#validate(org.eclipse.jface.text.IDocument,
 449          *      int, org.eclipse.jface.text.DocumentEvent)
 450          */
 451         public boolean validate(IDocument document, int offset, DocumentEvent event) {
 452                 try {
 453                         int replaceOffset = getReplaceOffset();
 454                         if (offset >= replaceOffset) {
 455                                 String content = document.get(replaceOffset, offset
 456                                                 - replaceOffset);
 457                                 return fTemplate.getName().startsWith(content);
 458                         }
 459                 } catch (BadLocationException e) {
 460                         // concurrent modification - ignore
 461                 }
 462                 return false;
 463         }
 464
 465         /*
 466          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension3#getReplacementString()
 467          */
 468         public CharSequence getPrefixCompletionText(IDocument document,
 469                         int completionOffset) {
 470                 return fTemplate.getName();
 471         }
 472
 473         /*
 474          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension3#getReplacementOffset()
 475          */
 476         public int getPrefixCompletionStart(IDocument document, int completionOffset) {
 477                 return getReplaceOffset();
 478         }
 479 }