Examples with NonDeletingPositionUpdater org.eclipse.ltk.internal.core.refactoring.NonDeletingPositionUpdater used on opensource projects

Example 1 with NonDeletingPositionUpdater

use of org.eclipse.ltk.internal.core.refactoring.NonDeletingPositionUpdater in project che by eclipse.

the class MultiStateTextFileChange method getPreviewContent.

/*
	 * @see org.eclipse.ltk.core.refactoring.TextEditBasedChange#getPreviewContent(org.eclipse.ltk.core.refactoring.TextEditBasedChangeGroup[],org.eclipse.jface.text.IRegion,boolean,int,org.eclipse.core.runtime.IProgressMonitor)
	 */
public final String getPreviewContent(final TextEditBasedChangeGroup[] groups, final IRegion region, final boolean expand, final int surround, final IProgressMonitor monitor) throws CoreException {
    final Set cachedGroups = new HashSet(Arrays.asList(groups));
    final IDocument document = new Document(getCurrentDocument(monitor).get());
    // Marks the region in the document to be previewed
    final Position range = new Position(region.getOffset(), region.getLength());
    try {
        ComposableBufferChange change = null;
        final TextEditBasedChangeGroup[] changedGroups = getChangeGroups();
        LinkedList compositeUndo = new LinkedList();
        for (int index = 0; index < fChanges.size(); index++) {
            change = (ComposableBufferChange) fChanges.get(index);
            TextEdit copy = null;
            try {
                // Have to use a copy
                fCopier = new TextEditCopier(change.getEdit());
                copy = fCopier.perform();
                // Create a mapping from the copied edits to its originals
                final Map originalMap = new HashMap();
                for (final Iterator outer = change.getGroups().iterator(); outer.hasNext(); ) {
                    final ComposableBufferChangeGroup group = (ComposableBufferChangeGroup) outer.next();
                    for (final Iterator inner = group.getCachedEdits().iterator(); inner.hasNext(); ) {
                        final TextEdit originalEdit = (TextEdit) inner.next();
                        final TextEdit copiedEdit = fCopier.getCopy(originalEdit);
                        if (copiedEdit != null)
                            originalMap.put(copiedEdit, originalEdit);
                        else
                            //$NON-NLS-1$
                            RefactoringCorePlugin.logErrorMessage("Could not find a copy for the indexed text edit " + originalEdit.toString());
                    }
                }
                final ComposableBufferChangeGroup[] currentGroup = { null };
                final TextEdit[] currentEdit = { null };
                // Text edit processor which sets the change group and
                // current edit when processing
                final TextEditProcessor processor = new TextEditProcessor(document, copy, TextEdit.NONE) {

                    protected final boolean considerEdit(final TextEdit edit) {
                        final TextEdit originalEdit = (TextEdit) originalMap.get(edit);
                        if (originalEdit != null) {
                            currentEdit[0] = originalEdit;
                            boolean found = false;
                            for (int offset = 0; offset < changedGroups.length && !found; offset++) {
                                final ComposableBufferChangeGroup group = (ComposableBufferChangeGroup) changedGroups[offset];
                                if (group.containsEdit(originalEdit)) {
                                    currentGroup[0] = group;
                                    found = true;
                                }
                            }
                            if (!found)
                                currentGroup[0] = null;
                        } else if (!(edit instanceof MultiTextEdit)) {
                            //$NON-NLS-1$
                            RefactoringCorePlugin.logErrorMessage("Could not find the original of the copied text edit " + edit.toString());
                        }
                        return true;
                    }
                };
                final LinkedList eventUndos = new LinkedList();
                // Listener to record the undos on the document (offsets
                // relative to the document event)
                final IDocumentListener listener = new IDocumentListener() {

                    public final void documentAboutToBeChanged(final DocumentEvent event) {
                        final ComposableUndoEdit edit = new ComposableUndoEdit();
                        edit.setGroup(currentGroup[0]);
                        edit.setOriginal(currentEdit[0]);
                        edit.setUndo(createUndoEdit(document, event.getOffset(), event.getLength(), event.getText()));
                        eventUndos.addFirst(edit);
                    }

                    public final void documentChanged(final DocumentEvent event) {
                    // Do nothing
                    }
                };
                try {
                    // Record undos in LIFO order
                    document.addDocumentListener(listener);
                    processor.performEdits();
                } finally {
                    document.removeDocumentListener(listener);
                }
                compositeUndo.addFirst(eventUndos);
            } finally {
                fCopier = null;
            }
        }
        final IPositionUpdater positionUpdater = new IPositionUpdater() {

            public final void update(final DocumentEvent event) {
                final int eventOffset = event.getOffset();
                final int eventLength = event.getLength();
                final int eventOldEndOffset = eventOffset + eventLength;
                final String eventText = event.getText();
                final int eventNewLength = eventText == null ? 0 : eventText.length();
                final int eventNewEndOffset = eventOffset + eventNewLength;
                final int deltaLength = eventNewLength - eventLength;
                try {
                    final Position[] positions = event.getDocument().getPositions(COMPOSABLE_POSITION_CATEGORY);
                    for (int index = 0; index < positions.length; index++) {
                        final Position position = positions[index];
                        if (position.isDeleted())
                            continue;
                        final int offset = position.getOffset();
                        final int length = position.getLength();
                        final int end = offset + length;
                        if (offset > eventOldEndOffset) {
                            // position comes way after change - shift
                            position.setOffset(offset + deltaLength);
                        } else if (end < eventOffset) {
                        // position comes way before change - leave
                        // alone
                        } else if (offset == eventOffset) {
                        // leave alone, since the edits are overlapping
                        } else if (offset <= eventOffset && end >= eventOldEndOffset) {
                            // event completely internal to the position
                            // -
                            // adjust length
                            position.setLength(length + deltaLength);
                        } else if (offset < eventOffset) {
                            // event extends over end of position - include
                            // the
                            // replacement text into the position
                            position.setLength(eventNewEndOffset - offset);
                        } else if (end > eventOldEndOffset) {
                            // event extends from before position into it -
                            // adjust
                            // offset and length, including the replacement
                            // text into
                            // the position
                            position.setOffset(eventOffset);
                            int deleted = eventOldEndOffset - offset;
                            position.setLength(length - deleted + eventNewLength);
                        } else {
                            // event comprises the position - keep it at the
                            // same
                            // position, but always inside the replacement
                            // text
                            int newOffset = Math.min(offset, eventNewEndOffset);
                            int newEndOffset = Math.min(end, eventNewEndOffset);
                            position.setOffset(newOffset);
                            position.setLength(newEndOffset - newOffset);
                        }
                    }
                } catch (BadPositionCategoryException exception) {
                // ignore and return
                }
            }
        };
        try {
            document.addPositionCategory(COMPOSABLE_POSITION_CATEGORY);
            document.addPositionUpdater(positionUpdater);
            // Apply undos in LIFO order to get to the original document
            // Track the undos of edits which are in change groups to be
            // previewed and insert
            // Undo edits for them (corresponding to the linearized net
            // effect on the original document)
            final LinkedList undoQueue = new LinkedList();
            for (final Iterator outer = compositeUndo.iterator(); outer.hasNext(); ) {
                for (final Iterator inner = ((List) outer.next()).iterator(); inner.hasNext(); ) {
                    final ComposableUndoEdit edit = (ComposableUndoEdit) inner.next();
                    final ReplaceEdit undo = edit.getUndo();
                    final int offset = undo.getOffset();
                    final int length = undo.getLength();
                    final String text = undo.getText();
                    ComposableEditPosition position = new ComposableEditPosition();
                    if (cachedGroups.contains(edit.getGroup())) {
                        if (text == null || text.equals("")) {
                            //$NON-NLS-1$
                            position.offset = offset;
                            if (length != 0) {
                                // Undo is a delete, create final insert
                                // edit
                                position.length = 0;
                                position.setText(edit.getOriginalText());
                            } else
                                //$NON-NLS-1$
                                RefactoringCorePlugin.logErrorMessage("Dubious undo edit found: " + undo.toString());
                        } else if (length == 0) {
                            position.offset = offset;
                            // Undo is an insert, create final delete
                            // edit
                            //$NON-NLS-1$
                            position.setText("");
                            position.length = text.length();
                        } else {
                            // Undo is a replace, create final replace edit
                            position.offset = offset;
                            position.length = length;
                            position.setText(edit.getOriginalText());
                        }
                        document.addPosition(COMPOSABLE_POSITION_CATEGORY, position);
                    }
                    position = new ComposableEditPosition();
                    position.offset = undo.getOffset();
                    position.length = undo.getLength();
                    position.setText(undo.getText());
                    undoQueue.add(position);
                }
                for (final Iterator iterator = undoQueue.iterator(); iterator.hasNext(); ) {
                    final ComposableEditPosition position = (ComposableEditPosition) iterator.next();
                    document.replace(position.offset, position.length, position.getText());
                    iterator.remove();
                }
            }
            // Use a simple non deleting position updater for the range
            final IPositionUpdater markerUpdater = new NonDeletingPositionUpdater(MARKER_POSITION_CATEGORY);
            try {
                final Position[] positions = document.getPositions(COMPOSABLE_POSITION_CATEGORY);
                document.addPositionCategory(MARKER_POSITION_CATEGORY);
                document.addPositionUpdater(markerUpdater);
                document.addPosition(MARKER_POSITION_CATEGORY, range);
                for (int index = 0; index < positions.length; index++) {
                    final ComposableEditPosition position = (ComposableEditPosition) positions[index];
                    //$NON-NLS-1$
                    document.replace(position.offset, position.length, position.getText() != null ? position.getText() : "");
                }
            } catch (BadPositionCategoryException exception) {
                RefactoringCorePlugin.log(exception);
            } finally {
                document.removePositionUpdater(markerUpdater);
                try {
                    document.removePosition(MARKER_POSITION_CATEGORY, range);
                    document.removePositionCategory(MARKER_POSITION_CATEGORY);
                } catch (BadPositionCategoryException exception) {
                // Cannot happen
                }
            }
        } catch (BadPositionCategoryException exception) {
            RefactoringCorePlugin.log(exception);
        } finally {
            document.removePositionUpdater(positionUpdater);
            try {
                document.removePositionCategory(COMPOSABLE_POSITION_CATEGORY);
            } catch (BadPositionCategoryException exception) {
                RefactoringCorePlugin.log(exception);
            }
        }
        return getContent(document, new Region(range.offset, range.length), expand, surround);
    } catch (MalformedTreeException exception) {
        RefactoringCorePlugin.log(exception);
    } catch (BadLocationException exception) {
        RefactoringCorePlugin.log(exception);
    }
    return getPreviewDocument(monitor).get();
}