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   1 /**********************************************************************
   2 Copyright (c) 2000, 2002 IBM Corp. 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 implementation
  10 **********************************************************************/
  11
  12 package net.sourceforge.phpdt.internal.ui.text.link;
  13
  14 import java.util.Arrays;
  15 import java.util.Comparator;
  16 import java.util.HashMap;
  17 import java.util.Map;
  18
  19 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  20
  21 import org.eclipse.jface.text.BadLocationException;
  22 import org.eclipse.jface.text.BadPositionCategoryException;
  23 import org.eclipse.jface.text.DocumentCommand;
  24 import org.eclipse.jface.text.DocumentEvent;
  25 import org.eclipse.jface.text.IAutoEditStrategy;
  26 import org.eclipse.jface.text.IDocument;
  27 import org.eclipse.jface.text.IDocumentExtension;
  28 import org.eclipse.jface.text.IDocumentListener;
  29 import org.eclipse.jface.text.IPositionUpdater;
  30 import org.eclipse.jface.text.Position;
  31 import org.eclipse.jface.text.TypedPosition;
  32 import org.eclipse.jface.util.Assert;
  33
  34
  35 /**
  36  * This class manages linked positions in a document. Positions are linked
  37  * by type names. If positions have the same type name, they are considered
  38  * as <em>linked</em>.
  39  *
  40  * The manager remains active on a document until any of the following actions
  41  * occurs:
  42  *
  43  * <ul>
  44  *   <li>A document change is performed which would invalidate any of the
  45  *       above constraints.</li>
  46  *
  47  *   <li>The method <code>uninstall()</code> is called.</li>
  48  *
  49  *   <li>Another instance of <code>LinkedPositionManager</code> tries to
  50  *       gain control of the same document.
  51  * </ul>
  52  */
  53 public class LinkedPositionManager implements IDocumentListener, IPositionUpdater, IAutoEditStrategy {
  54
  55         // This class still exists to properly handle code assist.
  56         // This is due to the fact that it cannot be distinguished betweeen document changes which are
  57         // issued by code assist and document changes which origin from another text viewer.
  58         // There is a conflict in interest since in the latter case the linked mode should be left, but in the former case
  59         // the linked mode should remain.
  60         // To support content assist, document changes have to be propagated to connected positions
  61         // by registering replace commands using IDocumentExtension.
  62         // if it wasn't for the support of content assist, the documentChanged() method could be reduced to
  63         // a simple call to leave(true)
  64         private class Replace implements IDocumentExtension.IReplace {
  65
  66                 private Position fReplacePosition;
  67                 private int fReplaceDeltaOffset;
  68                 private int fReplaceLength;
  69                 private String fReplaceText;
  70
  71                 public Replace(Position position, int deltaOffset, int length, String text) {
  72                         fReplacePosition= position;
  73                         fReplaceDeltaOffset= deltaOffset;
  74                         fReplaceLength= length;
  75                         fReplaceText= text;
  76                 }
  77
  78                 public void perform(IDocument document, IDocumentListener owner) {
  79                         document.removeDocumentListener(owner);
  80                         try {
  81                                 document.replace(fReplacePosition.getOffset() + fReplaceDeltaOffset, fReplaceLength, fReplaceText);
  82                         } catch (BadLocationException e) {
  83                                 PHPeclipsePlugin.log(e);
  84                                 // TBD
  85                         }
  86                         document.addDocumentListener(owner);
  87                 }
  88         }
  89
  90         private static class PositionComparator implements Comparator {
  91                 /*
  92                  * @see Comparator#compare(Object, Object)
  93                  */
  94                 public int compare(Object object0, Object object1) {
  95                         Position position0= (Position) object0;
  96                         Position position1= (Position) object1;
  97
  98                         return position0.getOffset() - position1.getOffset();
  99                 }
 100         }
 101
 102         private static final String LINKED_POSITION= "LinkedPositionManager.linked.position"; //$NON-NLS-1$
 103         private static final Comparator fgPositionComparator= new PositionComparator();
 104         private static final Map fgActiveManagers= new HashMap();
 105
 106         private IDocument fDocument;
 107
 108         private LinkedPositionListener fListener;
 109
 110         /**
 111          * Creates a <code>LinkedPositionManager</code> for a <code>IDocument</code>.
 112          *
 113          * @param document the document to use with linked positions.
 114          */
 115         public LinkedPositionManager(IDocument document) {
 116                 Assert.isNotNull(document);
 117
 118                 fDocument= document;
 119                 install();
 120         }
 121
 122         /**
 123          * Sets a listener to notify changes of current linked position.
 124          */
 125         public void setLinkedPositionListener(LinkedPositionListener listener) {
 126                 fListener= listener;
 127         }
 128
 129         /**
 130          * Adds a linked position to the manager.
 131          * There are the following constraints for linked positions:
 132          *
 133          * <ul>
 134          *   <li>Any two positions have spacing of at least one character.
 135          *       This implies that two positions must not overlap.</li>
 136          *
 137          *   <li>The string at any position must not contain line delimiters.</li>
 138          * </ul>
 139          *
 140          * @param offset the offset of the position.
 141          * @param length the length of the position.
 142          */
 143         public void addPosition(int offset, int length) throws BadLocationException {
 144                 Position[] positions= getPositions(fDocument);
 145
 146                 if (positions != null) {
 147                         for (int i = 0; i < positions.length; i++)
 148                                 if (collides(positions[i], offset, length))
 149                                         throw new BadLocationException(LinkedPositionMessages.getString(("LinkedPositionManager.error.position.collision"))); //$NON-NLS-1$
 150                 }
 151
 152                 String type= fDocument.get(offset, length);
 153
 154                 if (containsLineDelimiters(type))
 155                         throw new BadLocationException(LinkedPositionMessages.getString(("LinkedPositionManager.error.contains.line.delimiters"))); //$NON-NLS-1$
 156
 157                 try {
 158                         fDocument.addPosition(LINKED_POSITION, new TypedPosition(offset, length, type));
 159                 } catch (BadPositionCategoryException e) {
 160       PHPeclipsePlugin.log(e);
 161                         Assert.isTrue(false);
 162                 }
 163         }
 164
 165         /**
 166          * Tests if a manager is already active for a document.
 167          */
 168         public static boolean hasActiveManager(IDocument document) {
 169                 return fgActiveManagers.get(document) != null;
 170         }
 171
 172         private void install() {
 173                 LinkedPositionManager manager= (LinkedPositionManager) fgActiveManagers.get(fDocument);
 174                 if (manager != null)
 175                         manager.leave(true);
 176
 177                 fgActiveManagers.put(fDocument, this);
 178
 179                 fDocument.addPositionCategory(LINKED_POSITION);
 180                 fDocument.addPositionUpdater(this);
 181                 fDocument.addDocumentListener(this);
 182         }
 183
 184         /**
 185          * Leaves the linked mode. If unsuccessful, the linked positions
 186          * are restored to the values at the time they were added.
 187          */
 188         public void uninstall(boolean success) {
 189                 fDocument.removeDocumentListener(this);
 190
 191                 try {
 192                         Position[] positions= getPositions(fDocument);
 193                         if ((!success) && (positions != null)) {
 194                                 // restore
 195                                 for (int i= 0; i != positions.length; i++) {
 196                                         TypedPosition position= (TypedPosition) positions[i];
 197                                         fDocument.replace(position.getOffset(), position.getLength(), position.getType());
 198                                 }
 199                         }
 200
 201                         fDocument.removePositionCategory(LINKED_POSITION);
 202
 203                 } catch (BadLocationException e) {
 204       PHPeclipsePlugin.log(e);
 205                         Assert.isTrue(false);
 206
 207                 } catch (BadPositionCategoryException e) {
 208       PHPeclipsePlugin.log(e);
 209                         Assert.isTrue(false);
 210
 211                 } finally {
 212                         fDocument.removePositionUpdater(this);
 213                         fgActiveManagers.remove(fDocument);
 214                 }
 215         }
 216
 217         /**
 218          * Returns the position at the given offset, <code>null</code> if there is no position.
 219          * @since 2.1
 220          */
 221         public Position getPosition(int offset) {
 222                 Position[] positions= getPositions(fDocument);
 223                 if (positions == null)
 224                         return null;
 225
 226                 for (int i= positions.length - 1; i >= 0; i--) {
 227                         Position position= positions[i];
 228                         if (offset >= position.getOffset() && offset <= position.getOffset() + position.getLength())
 229                                 return positions[i];
 230                 }
 231
 232                 return null;
 233         }
 234
 235         /**
 236          * Returns the first linked position.
 237          *
 238          * @return returns <code>null</code> if no linked position exist.
 239          */
 240         public Position getFirstPosition() {
 241                 return getNextPosition(-1);
 242         }
 243
 244         /**
 245          * Returns the next linked position with an offset greater than <code>offset</code>.
 246          * If another position with the same type and offset lower than <code>offset</code>
 247          * exists, the position is skipped.
 248          *
 249          * @return returns <code>null</code> if no linked position exist.
 250          */
 251         public Position getNextPosition(int offset) {
 252                 Position[] positions= getPositions(fDocument);
 253                 return findNextPosition(positions, offset);
 254         }
 255
 256         private static Position findNextPosition(Position[] positions, int offset) {
 257                 // skip already visited types
 258                 for (int i= 0; i != positions.length; i++) {
 259                         if (positions[i].getOffset() > offset) {
 260                                 String type= ((TypedPosition) positions[i]).getType();
 261                                 int j;
 262                                 for (j = 0; j != i; j++)
 263                                         if (((TypedPosition) positions[j]).getType().equals(type))
 264                                                 break;
 265
 266                                 if (j == i)
 267                                         return positions[i];
 268                         }
 269                 }
 270
 271                 return null;
 272         }
 273
 274         /**
 275          * Returns the position with the greatest offset smaller than <code>offset</code>.
 276          *
 277          * @return returns <code>null</code> if no linked position exist.
 278          */
 279         public Position getPreviousPosition(int offset) {
 280                 Position[] positions= getPositions(fDocument);
 281                 if (positions == null)
 282                         return null;
 283
 284                 TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, offset);
 285                 String currentType= currentPosition == null ? null : currentPosition.getType();
 286
 287                 Position lastPosition= null;
 288                 Position position= getFirstPosition();
 289
 290                 while ((position != null) && (position.getOffset() < offset) && !((TypedPosition) position).getType().equals(currentType)) {
 291                         lastPosition= position;
 292                         position= findNextPosition(positions, position.getOffset());
 293                 }
 294
 295                 return lastPosition;
 296         }
 297
 298         private static Position[] getPositions(IDocument document) {
 299                 try {
 300                         Position[] positions= document.getPositions(LINKED_POSITION);
 301                         Arrays.sort(positions, fgPositionComparator);
 302                         return positions;
 303
 304                 } catch (BadPositionCategoryException e) {
 305       PHPeclipsePlugin.log(e);
 306                         Assert.isTrue(false);
 307                 }
 308
 309                 return null;
 310         }
 311
 312         public static boolean includes(Position position, int offset, int length) {
 313                 return
 314                         (offset >= position.getOffset()) &&
 315                         (offset + length <= position.getOffset() + position.getLength());
 316         }
 317
 318         public static boolean excludes(Position position, int offset, int length) {
 319                 return
 320                         (offset + length <= position.getOffset()) ||
 321                         (position.getOffset() + position.getLength() <= offset);
 322         }
 323
 324         /*
 325          * Collides if spacing if positions intersect each other or are adjacent.
 326          */
 327         private static boolean collides(Position position, int offset, int length) {
 328                 return
 329                         (offset <= position.getOffset() + position.getLength()) &&
 330                         (position.getOffset() <= offset + length);
 331         }
 332
 333         private void leave(boolean success) {
 334                 uninstall(success);
 335
 336                 if (fListener != null)
 337                         fListener.exit(success);
 338         }
 339
 340         /*
 341          * @see IDocumentListener#documentAboutToBeChanged(DocumentEvent)
 342          */
 343         public void documentAboutToBeChanged(DocumentEvent event) {
 344
 345                 IDocument document= event.getDocument();
 346
 347                 Position[] positions= getPositions(document);
 348                 Position position= findCurrentPosition(positions, event.getOffset());
 349
 350                 // modification outside editable position
 351                 if (position == null) {
 352                         // check for destruction of constraints (spacing of at least 1)
 353                         if ((event.getText() == null || event.getText().length() == 0) &&
 354                                 (findCurrentPosition(positions, event.getOffset()) != null) &&
 355                                 (findCurrentPosition(positions, event.getOffset() + event.getLength()) != null))
 356                         {
 357                                 leave(true);
 358                         }
 359
 360                 // modification intersects editable position
 361                 } else {
 362                         // modificaction inside editable position
 363                         if (includes(position, event.getOffset(), event.getLength())) {
 364                                 if (containsLineDelimiters(event.getText()))
 365                                         leave(true);
 366
 367                         // modificaction exceeds editable position
 368                         } else {
 369                                 leave(true);
 370                         }
 371                 }
 372         }
 373
 374         /*
 375          * @see IDocumentListener#documentChanged(DocumentEvent)
 376          */
 377         public void documentChanged(DocumentEvent event) {
 378
 379                 // have to handle code assist, so can't just leave the linked mode
 380                 // leave(true);
 381
 382                 IDocument document= event.getDocument();
 383
 384                 Position[] positions= getPositions(document);
 385                 TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, event.getOffset());
 386
 387                 // ignore document changes (assume it won't invalidate constraints)
 388                 if (currentPosition == null)
 389                         return;
 390
 391                 int deltaOffset= event.getOffset() - currentPosition.getOffset();
 392
 393                 if (fListener != null) {
 394                         int length= event.getText() == null ? 0 : event.getText().length();
 395                         fListener.setCurrentPosition(currentPosition, deltaOffset + length);
 396                 }
 397
 398                 for (int i= 0; i != positions.length; i++) {
 399                         TypedPosition p= (TypedPosition) positions[i];
 400
 401                         if (p.getType().equals(currentPosition.getType()) && !p.equals(currentPosition)) {
 402                                 Replace replace= new Replace(p, deltaOffset, event.getLength(), event.getText());
 403                                 ((IDocumentExtension) document).registerPostNotificationReplace(this, replace);
 404                         }
 405                 }
 406         }
 407
 408         /*
 409          * @see IPositionUpdater#update(DocumentEvent)
 410          */
 411         public void update(DocumentEvent event) {
 412                 int deltaLength= (event.getText() == null ? 0 : event.getText().length()) - event.getLength();
 413
 414                 Position[] positions= getPositions(event.getDocument());
 415                 TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, event.getOffset());
 416
 417                 // document change outside positions
 418                 if (currentPosition == null) {
 419
 420                         for (int i= 0; i != positions.length; i++) {
 421                                 TypedPosition position= (TypedPosition) positions[i];
 422                                 int offset= position.getOffset();
 423
 424                                 if (offset >= event.getOffset())
 425                                         position.setOffset(offset + deltaLength);
 426                         }
 427
 428                 // document change within a position
 429                 } else {
 430                         int length= currentPosition.getLength();
 431
 432                         for (int i= 0; i != positions.length; i++) {
 433                                 TypedPosition position= (TypedPosition) positions[i];
 434                                 int offset= position.getOffset();
 435
 436                                 if (position.equals(currentPosition)) {
 437                                         position.setLength(length + deltaLength);
 438                                 } else if (offset > currentPosition.getOffset()) {
 439                                         position.setOffset(offset + deltaLength);
 440                                 }
 441                         }
 442                 }
 443         }
 444
 445         private static Position findCurrentPosition(Position[] positions, int offset) {
 446                 for (int i= 0; i != positions.length; i++)
 447                         if (includes(positions[i], offset, 0))
 448                                 return positions[i];
 449
 450                 return null;
 451         }
 452
 453         private boolean containsLineDelimiters(String string) {
 454
 455                 if (string == null)
 456                         return false;
 457
 458                 String[] delimiters= fDocument.getLegalLineDelimiters();
 459
 460                 for (int i= 0; i != delimiters.length; i++)
 461                         if (string.indexOf(delimiters[i]) != -1)
 462                                 return true;
 463
 464                 return false;
 465         }
 466
 467         /**
 468          * Test if ok to modify through UI.
 469          */
 470         public boolean anyPositionIncludes(int offset, int length) {
 471                 Position[] positions= getPositions(fDocument);
 472
 473                 Position position= findCurrentPosition(positions, offset);
 474                 if (position == null)
 475                         return false;
 476
 477                 return includes(position, offset, length);
 478         }
 479
 480         /*
 481          * @see org.eclipse.jface.text.IAutoIndentStrategy#customizeDocumentCommand(org.eclipse.jface.text.IDocument, org.eclipse.jface.text.DocumentCommand)
 482          */
 483         public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
 484
 485                 // don't interfere with preceding auto edit strategies
 486                 if (command.getCommandCount() != 1) {
 487                         leave(true);
 488                         return;
 489                 }
 490
 491                 Position[] positions= getPositions(document);
 492                 TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, command.offset);
 493
 494                 // handle edits outside of a position
 495                 if (currentPosition == null) {
 496                         leave(true);
 497                         return;
 498                 }
 499
 500                 if (! command.doit)
 501                         return;
 502
 503                 command.doit= false;
 504                 command.owner= this;
 505                 command.caretOffset= command.offset + command.length;
 506
 507                 int deltaOffset= command.offset - currentPosition.getOffset();
 508
 509                 if (fListener != null)
 510                         fListener.setCurrentPosition(currentPosition, deltaOffset + command.text.length());
 511
 512                 for (int i= 0; i != positions.length; i++) {
 513                         TypedPosition position= (TypedPosition) positions[i];
 514
 515                         try {
 516                                 if (position.getType().equals(currentPosition.getType()) && !position.equals(currentPosition))
 517                                         command.addCommand(position.getOffset() + deltaOffset, command.length, command.text, this);
 518                         } catch (BadLocationException e) {
 519         PHPeclipsePlugin.log(e);
 520                         }
 521                 }
 522         }
 523
 524 }