+++ /dev/null
-/**********************************************************************
-Copyright (c) 2000, 2002 IBM Corp. and others.
-All rights reserved. This program and the accompanying materials
-are made available under the terms of the Common Public License v1.0
-which accompanies this distribution, and is available at
-http://www.eclipse.org/legal/cpl-v10.html
-
-Contributors:
- IBM Corporation - Initial implementation
-**********************************************************************/
-
-package net.sourceforge.phpdt.internal.ui.text.link;
-
-import java.util.Arrays;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.Map;
-
-import net.sourceforge.phpeclipse.PHPeclipsePlugin;
-
-import org.eclipse.jface.text.BadLocationException;
-import org.eclipse.jface.text.BadPositionCategoryException;
-import org.eclipse.jface.text.DocumentCommand;
-import org.eclipse.jface.text.DocumentEvent;
-import org.eclipse.jface.text.IAutoEditStrategy;
-import org.eclipse.jface.text.IDocument;
-import org.eclipse.jface.text.IDocumentExtension;
-import org.eclipse.jface.text.IDocumentListener;
-import org.eclipse.jface.text.IPositionUpdater;
-import org.eclipse.jface.text.Position;
-import org.eclipse.jface.text.TypedPosition;
-import org.eclipse.jface.util.Assert;
-
-
-/**
- * This class manages linked positions in a document. Positions are linked
- * by type names. If positions have the same type name, they are considered
- * as <em>linked</em>.
- *
- * The manager remains active on a document until any of the following actions
- * occurs:
- *
- * <ul>
- * <li>A document change is performed which would invalidate any of the
- * above constraints.</li>
- *
- * <li>The method <code>uninstall()</code> is called.</li>
- *
- * <li>Another instance of <code>LinkedPositionManager</code> tries to
- * gain control of the same document.
- * </ul>
- */
-public class LinkedPositionManager implements IDocumentListener, IPositionUpdater, IAutoEditStrategy {
-
- // This class still exists to properly handle code assist.
- // This is due to the fact that it cannot be distinguished betweeen document changes which are
- // issued by code assist and document changes which origin from another text viewer.
- // There is a conflict in interest since in the latter case the linked mode should be left, but in the former case
- // the linked mode should remain.
- // To support content assist, document changes have to be propagated to connected positions
- // by registering replace commands using IDocumentExtension.
- // if it wasn't for the support of content assist, the documentChanged() method could be reduced to
- // a simple call to leave(true)
- private class Replace implements IDocumentExtension.IReplace {
-
- private Position fReplacePosition;
- private int fReplaceDeltaOffset;
- private int fReplaceLength;
- private String fReplaceText;
-
- public Replace(Position position, int deltaOffset, int length, String text) {
- fReplacePosition= position;
- fReplaceDeltaOffset= deltaOffset;
- fReplaceLength= length;
- fReplaceText= text;
- }
-
- public void perform(IDocument document, IDocumentListener owner) {
- document.removeDocumentListener(owner);
- try {
- document.replace(fReplacePosition.getOffset() + fReplaceDeltaOffset, fReplaceLength, fReplaceText);
- } catch (BadLocationException e) {
- PHPeclipsePlugin.log(e);
- // TBD
- }
- document.addDocumentListener(owner);
- }
- }
-
- private static class PositionComparator implements Comparator {
- /*
- * @see Comparator#compare(Object, Object)
- */
- public int compare(Object object0, Object object1) {
- Position position0= (Position) object0;
- Position position1= (Position) object1;
-
- return position0.getOffset() - position1.getOffset();
- }
- }
-
- private static final String LINKED_POSITION= "LinkedPositionManager.linked.position"; //$NON-NLS-1$
- private static final Comparator fgPositionComparator= new PositionComparator();
- private static final Map fgActiveManagers= new HashMap();
-
- private IDocument fDocument;
-
- private LinkedPositionListener fListener;
-
- /**
- * Creates a <code>LinkedPositionManager</code> for a <code>IDocument</code>.
- *
- * @param document the document to use with linked positions.
- */
- public LinkedPositionManager(IDocument document) {
- Assert.isNotNull(document);
-
- fDocument= document;
- install();
- }
-
- /**
- * Sets a listener to notify changes of current linked position.
- */
- public void setLinkedPositionListener(LinkedPositionListener listener) {
- fListener= listener;
- }
-
- /**
- * Adds a linked position to the manager.
- * There are the following constraints for linked positions:
- *
- * <ul>
- * <li>Any two positions have spacing of at least one character.
- * This implies that two positions must not overlap.</li>
- *
- * <li>The string at any position must not contain line delimiters.</li>
- * </ul>
- *
- * @param offset the offset of the position.
- * @param length the length of the position.
- */
- public void addPosition(int offset, int length) throws BadLocationException {
- Position[] positions= getPositions(fDocument);
-
- if (positions != null) {
- for (int i = 0; i < positions.length; i++)
- if (collides(positions[i], offset, length))
- throw new BadLocationException(LinkedPositionMessages.getString(("LinkedPositionManager.error.position.collision"))); //$NON-NLS-1$
- }
-
- String type= fDocument.get(offset, length);
-
- if (containsLineDelimiters(type))
- throw new BadLocationException(LinkedPositionMessages.getString(("LinkedPositionManager.error.contains.line.delimiters"))); //$NON-NLS-1$
-
- try {
- fDocument.addPosition(LINKED_POSITION, new TypedPosition(offset, length, type));
- } catch (BadPositionCategoryException e) {
- PHPeclipsePlugin.log(e);
- Assert.isTrue(false);
- }
- }
-
- /**
- * Tests if a manager is already active for a document.
- */
- public static boolean hasActiveManager(IDocument document) {
- return fgActiveManagers.get(document) != null;
- }
-
- private void install() {
- LinkedPositionManager manager= (LinkedPositionManager) fgActiveManagers.get(fDocument);
- if (manager != null)
- manager.leave(true);
-
- fgActiveManagers.put(fDocument, this);
-
- fDocument.addPositionCategory(LINKED_POSITION);
- fDocument.addPositionUpdater(this);
- fDocument.addDocumentListener(this);
- }
-
- /**
- * Leaves the linked mode. If unsuccessful, the linked positions
- * are restored to the values at the time they were added.
- */
- public void uninstall(boolean success) {
- fDocument.removeDocumentListener(this);
-
- try {
- Position[] positions= getPositions(fDocument);
- if ((!success) && (positions != null)) {
- // restore
- for (int i= 0; i != positions.length; i++) {
- TypedPosition position= (TypedPosition) positions[i];
- fDocument.replace(position.getOffset(), position.getLength(), position.getType());
- }
- }
-
- fDocument.removePositionCategory(LINKED_POSITION);
-
- } catch (BadLocationException e) {
- PHPeclipsePlugin.log(e);
- Assert.isTrue(false);
-
- } catch (BadPositionCategoryException e) {
- PHPeclipsePlugin.log(e);
- Assert.isTrue(false);
-
- } finally {
- fDocument.removePositionUpdater(this);
- fgActiveManagers.remove(fDocument);
- }
- }
-
- /**
- * Returns the position at the given offset, <code>null</code> if there is no position.
- * @since 2.1
- */
- public Position getPosition(int offset) {
- Position[] positions= getPositions(fDocument);
- if (positions == null)
- return null;
-
- for (int i= positions.length - 1; i >= 0; i--) {
- Position position= positions[i];
- if (offset >= position.getOffset() && offset <= position.getOffset() + position.getLength())
- return positions[i];
- }
-
- return null;
- }
-
- /**
- * Returns the first linked position.
- *
- * @return returns <code>null</code> if no linked position exist.
- */
- public Position getFirstPosition() {
- return getNextPosition(-1);
- }
-
- /**
- * Returns the next linked position with an offset greater than <code>offset</code>.
- * If another position with the same type and offset lower than <code>offset</code>
- * exists, the position is skipped.
- *
- * @return returns <code>null</code> if no linked position exist.
- */
- public Position getNextPosition(int offset) {
- Position[] positions= getPositions(fDocument);
- return findNextPosition(positions, offset);
- }
-
- private static Position findNextPosition(Position[] positions, int offset) {
- // skip already visited types
- for (int i= 0; i != positions.length; i++) {
- if (positions[i].getOffset() > offset) {
- String type= ((TypedPosition) positions[i]).getType();
- int j;
- for (j = 0; j != i; j++)
- if (((TypedPosition) positions[j]).getType().equals(type))
- break;
-
- if (j == i)
- return positions[i];
- }
- }
-
- return null;
- }
-
- /**
- * Returns the position with the greatest offset smaller than <code>offset</code>.
- *
- * @return returns <code>null</code> if no linked position exist.
- */
- public Position getPreviousPosition(int offset) {
- Position[] positions= getPositions(fDocument);
- if (positions == null)
- return null;
-
- TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, offset);
- String currentType= currentPosition == null ? null : currentPosition.getType();
-
- Position lastPosition= null;
- Position position= getFirstPosition();
-
- while ((position != null) && (position.getOffset() < offset) && !((TypedPosition) position).getType().equals(currentType)) {
- lastPosition= position;
- position= findNextPosition(positions, position.getOffset());
- }
-
- return lastPosition;
- }
-
- private static Position[] getPositions(IDocument document) {
- try {
- Position[] positions= document.getPositions(LINKED_POSITION);
- Arrays.sort(positions, fgPositionComparator);
- return positions;
-
- } catch (BadPositionCategoryException e) {
- PHPeclipsePlugin.log(e);
- Assert.isTrue(false);
- }
-
- return null;
- }
-
- public static boolean includes(Position position, int offset, int length) {
- return
- (offset >= position.getOffset()) &&
- (offset + length <= position.getOffset() + position.getLength());
- }
-
- public static boolean excludes(Position position, int offset, int length) {
- return
- (offset + length <= position.getOffset()) ||
- (position.getOffset() + position.getLength() <= offset);
- }
-
- /*
- * Collides if spacing if positions intersect each other or are adjacent.
- */
- private static boolean collides(Position position, int offset, int length) {
- return
- (offset <= position.getOffset() + position.getLength()) &&
- (position.getOffset() <= offset + length);
- }
-
- private void leave(boolean success) {
- uninstall(success);
-
- if (fListener != null)
- fListener.exit(success);
- }
-
- /*
- * @see IDocumentListener#documentAboutToBeChanged(DocumentEvent)
- */
- public void documentAboutToBeChanged(DocumentEvent event) {
-
- IDocument document= event.getDocument();
-
- Position[] positions= getPositions(document);
- Position position= findCurrentPosition(positions, event.getOffset());
-
- // modification outside editable position
- if (position == null) {
- // check for destruction of constraints (spacing of at least 1)
- if ((event.getText() == null || event.getText().length() == 0) &&
- (findCurrentPosition(positions, event.getOffset()) != null) &&
- (findCurrentPosition(positions, event.getOffset() + event.getLength()) != null))
- {
- leave(true);
- }
-
- // modification intersects editable position
- } else {
- // modificaction inside editable position
- if (includes(position, event.getOffset(), event.getLength())) {
- if (containsLineDelimiters(event.getText()))
- leave(true);
-
- // modificaction exceeds editable position
- } else {
- leave(true);
- }
- }
- }
-
- /*
- * @see IDocumentListener#documentChanged(DocumentEvent)
- */
- public void documentChanged(DocumentEvent event) {
-
- // have to handle code assist, so can't just leave the linked mode
- // leave(true);
-
- IDocument document= event.getDocument();
-
- Position[] positions= getPositions(document);
- TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, event.getOffset());
-
- // ignore document changes (assume it won't invalidate constraints)
- if (currentPosition == null)
- return;
-
- int deltaOffset= event.getOffset() - currentPosition.getOffset();
-
- if (fListener != null) {
- int length= event.getText() == null ? 0 : event.getText().length();
- fListener.setCurrentPosition(currentPosition, deltaOffset + length);
- }
-
- for (int i= 0; i != positions.length; i++) {
- TypedPosition p= (TypedPosition) positions[i];
-
- if (p.getType().equals(currentPosition.getType()) && !p.equals(currentPosition)) {
- Replace replace= new Replace(p, deltaOffset, event.getLength(), event.getText());
- ((IDocumentExtension) document).registerPostNotificationReplace(this, replace);
- }
- }
- }
-
- /*
- * @see IPositionUpdater#update(DocumentEvent)
- */
- public void update(DocumentEvent event) {
- int deltaLength= (event.getText() == null ? 0 : event.getText().length()) - event.getLength();
-
- Position[] positions= getPositions(event.getDocument());
- TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, event.getOffset());
-
- // document change outside positions
- if (currentPosition == null) {
-
- for (int i= 0; i != positions.length; i++) {
- TypedPosition position= (TypedPosition) positions[i];
- int offset= position.getOffset();
-
- if (offset >= event.getOffset())
- position.setOffset(offset + deltaLength);
- }
-
- // document change within a position
- } else {
- int length= currentPosition.getLength();
-
- for (int i= 0; i != positions.length; i++) {
- TypedPosition position= (TypedPosition) positions[i];
- int offset= position.getOffset();
-
- if (position.equals(currentPosition)) {
- position.setLength(length + deltaLength);
- } else if (offset > currentPosition.getOffset()) {
- position.setOffset(offset + deltaLength);
- }
- }
- }
- }
-
- private static Position findCurrentPosition(Position[] positions, int offset) {
- for (int i= 0; i != positions.length; i++)
- if (includes(positions[i], offset, 0))
- return positions[i];
-
- return null;
- }
-
- private boolean containsLineDelimiters(String string) {
-
- if (string == null)
- return false;
-
- String[] delimiters= fDocument.getLegalLineDelimiters();
-
- for (int i= 0; i != delimiters.length; i++)
- if (string.indexOf(delimiters[i]) != -1)
- return true;
-
- return false;
- }
-
- /**
- * Test if ok to modify through UI.
- */
- public boolean anyPositionIncludes(int offset, int length) {
- Position[] positions= getPositions(fDocument);
-
- Position position= findCurrentPosition(positions, offset);
- if (position == null)
- return false;
-
- return includes(position, offset, length);
- }
-
- /*
- * @see org.eclipse.jface.text.IAutoIndentStrategy#customizeDocumentCommand(org.eclipse.jface.text.IDocument, org.eclipse.jface.text.DocumentCommand)
- */
- public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
-
- // don't interfere with preceding auto edit strategies
- if (command.getCommandCount() != 1) {
- leave(true);
- return;
- }
-
- Position[] positions= getPositions(document);
- TypedPosition currentPosition= (TypedPosition) findCurrentPosition(positions, command.offset);
-
- // handle edits outside of a position
- if (currentPosition == null) {
- leave(true);
- return;
- }
-
- if (! command.doit)
- return;
-
- command.doit= false;
- command.owner= this;
- command.caretOffset= command.offset + command.length;
-
- int deltaOffset= command.offset - currentPosition.getOffset();
-
- if (fListener != null)
- fListener.setCurrentPosition(currentPosition, deltaOffset + command.text.length());
-
- for (int i= 0; i != positions.length; i++) {
- TypedPosition position= (TypedPosition) positions[i];
-
- try {
- if (position.getType().equals(currentPosition.getType()) && !position.equals(currentPosition))
- command.addCommand(position.getOffset() + deltaOffset, command.length, command.text, this);
- } catch (BadLocationException e) {
- PHPeclipsePlugin.log(e);
- }
- }
- }
-
-}
\ No newline at end of file
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