--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/text/edits/MoveTargetEdit.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,196 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.text.edits.MoveTargetEdit;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.IDocument;
+
+/**
+ * A move target edit denotes the target of a move operation. Move
+ * target edits are only valid inside an edit tree if they have a
+ * corresponding source edit. Furthermore a target edit can't
+ * can't be a direct or indirect child of its associated source edit.
+ * Violating one of two requirements will result in a <code>
+ * MalformedTreeException</code> when executing the edit tree.
+ * <p>
+ * Move target edits can't be used as a parent for other edits.
+ * Trying to add an edit to a move target edit results in a <code>
+ * MalformedTreeException</code> as well.
+ *
+ * @see dwtx.text.edits.MoveSourceEdit
+ * @see dwtx.text.edits.CopyTargetEdit
+ *
+ * @since 3.0
+ */
+public final class MoveTargetEdit : TextEdit {
+
+    private MoveSourceEdit fSource;
+
+    /**
+     * Constructs a new move target edit
+     *
+     * @param offset the edit's offset
+     */
+    public MoveTargetEdit(int offset) {
+        super(offset, 0);
+    }
+
+    /**
+     * Constructs an new move target edit
+     *
+     * @param offset the edit's offset
+     * @param source the corresponding source edit
+     */
+    public MoveTargetEdit(int offset, MoveSourceEdit source) {
+        this(offset);
+        setSourceEdit(source);
+    }
+
+    /*
+     * Copy constructor
+     */
+    private MoveTargetEdit(MoveTargetEdit other) {
+        super(other);
+    }
+
+    /**
+     * Returns the associated source edit or <code>null</code>
+     * if no source edit is associated yet.
+     *
+     * @return the source edit or <code>null</code>
+     */
+    public MoveSourceEdit getSourceEdit() {
+        return fSource;
+    }
+
+    /**
+     * Sets the source edit.
+     *
+     * @param edit the source edit
+     *
+     * @exception MalformedTreeException is thrown if the target edit
+     *  is a direct or indirect child of the source edit
+     */
+    public void setSourceEdit(MoveSourceEdit edit) {
+        if (fSource !is edit) {
+            fSource= edit;
+            fSource.setTargetEdit(this);
+            TextEdit parent= getParent();
+            while (parent !is null) {
+                if (parent is fSource)
+                    throw new MalformedTreeException(parent, this, TextEditMessages.getString("MoveTargetEdit.wrong_parent")); //$NON-NLS-1$
+                parent= parent.getParent();
+            }
+        }
+    }
+
+    /*
+     * @see TextEdit#doCopy
+     */
+    protected TextEdit doCopy() {
+        return new MoveTargetEdit(this);
+    }
+
+    /*
+     * @see TextEdit#postProcessCopy
+     */
+    protected void postProcessCopy(TextEditCopier copier) {
+        if (fSource !is null) {
+            MoveTargetEdit target= (MoveTargetEdit)copier.getCopy(this);
+            MoveSourceEdit source= (MoveSourceEdit)copier.getCopy(fSource);
+            if (target !is null && source !is null)
+                target.setSourceEdit(source);
+        }
+    }
+
+    /*
+     * @see TextEdit#accept0
+     */
+    protected void accept0(TextEditVisitor visitor) {
+        bool visitChildren= visitor.visit(this);
+        if (visitChildren) {
+            acceptChildren(visitor);
+        }
+    }
+
+    //---- consistency check ----------------------------------------------------------
+
+    /*
+     * @see TextEdit#traverseConsistencyCheck
+     */
+    int traverseConsistencyCheck(TextEditProcessor processor, IDocument document, List sourceEdits) {
+        return super.traverseConsistencyCheck(processor, document, sourceEdits) + 1;
+    }
+
+    /*
+     * @see TextEdit#performConsistencyCheck
+     */
+    void performConsistencyCheck(TextEditProcessor processor, IDocument document) throws MalformedTreeException {
+        if (fSource is null)
+            throw new MalformedTreeException(getParent(), this, TextEditMessages.getString("MoveTargetEdit.no_source")); //$NON-NLS-1$
+        if (fSource.getTargetEdit() !is this)
+            throw new MalformedTreeException(getParent(), this, TextEditMessages.getString("MoveTargetEdit.different_target")); //$NON-NLS-1$
+    }
+
+    //---- document updating ----------------------------------------------------------------
+
+    /*
+     * @see TextEdit#performDocumentUpdating
+     */
+    int performDocumentUpdating(IDocument document) throws BadLocationException {
+        String source= fSource.getContent();
+        document.replace(getOffset(), getLength(), source);
+        fDelta= source.length() - getLength();
+
+        MultiTextEdit sourceRoot= fSource.getSourceRoot();
+        if (sourceRoot !is null) {
+            sourceRoot.internalMoveTree(getOffset());
+            TextEdit[] sourceChildren= sourceRoot.removeChildren();
+            List children= new ArrayList(sourceChildren.length);
+            for (int i= 0; i < sourceChildren.length; i++) {
+                TextEdit child= sourceChildren[i];
+                child.internalSetParent(this);
+                children.add(child);
+            }
+            internalSetChildren(children);
+        }
+        fSource.clearContent();
+        return fDelta;
+    }
+
+    //---- region updating --------------------------------------------------------------
+
+    /*
+     * @see dwtx.text.edits.TextEdit#traversePassThree
+     */
+    int traverseRegionUpdating(TextEditProcessor processor, IDocument document, int accumulatedDelta, bool delete) {
+        // the children got already updated / normalized while they got removed
+        // from the source edit. So we only have to adjust the offset computed to
+        // far.
+        if (delete) {
+            deleteTree();
+        } else {
+            internalMoveTree(accumulatedDelta);
+        }
+        return accumulatedDelta + fDelta;
+    }
+
+    bool deleteChildren() {
+        return false;
+    }
+}