--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/text/edits/MultiTextEdit.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,233 @@
+/*******************************************************************************
+ * 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.MultiTextEdit;
+
+import dwt.dwthelper.utils;
+
+import java.util.List;
+
+import dwtx.core.runtime.Assert;
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.IDocument;
+import dwtx.jface.text.IRegion;
+
+/**
+ * A multi-text edit can be used to aggregate several edits into
+ * one edit. The edit itself doesn't modify a document.
+ * <p>
+ * Clients are allowed to implement subclasses of a multi-text
+ * edit.Subclasses must implement <code>doCopy()</code> to ensure
+ * the a copy of the right type is created. Not implementing
+ * <code>doCopy()</code> in subclasses will result in an assertion
+ * failure during copying.
+ *
+ * @since 3.0
+ */
+public class MultiTextEdit : TextEdit {
+
+    private bool fDefined;
+
+    /**
+     * Creates a new <code>MultiTextEdit</code>. The range
+     * of the edit is determined by the range of its children.
+     *
+     * Adding this edit to a parent edit sets its range to the
+     * range covered by its children. If the edit doesn't have
+     * any children its offset is set to the parent's offset
+     * and its length is set to 0.
+     */
+    public MultiTextEdit() {
+        super(0, Integer.MAX_VALUE);
+        fDefined= false;
+    }
+
+    /**
+     * Creates a new </code>MultiTextEdit</code> for the given
+     * range. Adding a child to this edit which isn't covered
+     * by the given range will result in an exception.
+     *
+     * @param offset the edit's offset
+     * @param length the edit's length.
+     * @see TextEdit#addChild(TextEdit)
+     * @see TextEdit#addChildren(TextEdit[])
+     */
+    public MultiTextEdit(int offset, int length) {
+        super(offset, length);
+        fDefined= true;
+    }
+
+    /*
+     * Copy constructor.
+     */
+    protected MultiTextEdit(MultiTextEdit other) {
+        super(other);
+    }
+
+    /**
+     * Checks the edit's integrity.
+     * <p>
+     * Note that this method <b>should only be called</b> by the edit
+     * framework and not by normal clients.</p>
+     *<p>
+     * This default implementation does nothing. Subclasses may override
+     * if needed.</p>
+     *
+     * @exception MalformedTreeException if the edit isn't in a valid state
+     *  and can therefore not be executed
+     */
+    protected void checkIntegrity() throws MalformedTreeException {
+        // does nothing
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    final bool isDefined() {
+        if (fDefined)
+            return true;
+        return hasChildren();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final int getOffset() {
+        if (fDefined)
+            return super.getOffset();
+
+        List/*<TextEdit>*/ children= internalGetChildren();
+        if (children is null || children.size() is 0)
+            return 0;
+        // the children are already sorted
+        return ((TextEdit)children.get(0)).getOffset();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final int getLength() {
+        if (fDefined)
+            return super.getLength();
+
+        List/*<TextEdit>*/ children= internalGetChildren();
+        if (children is null || children.size() is 0)
+            return 0;
+        // the children are already sorted
+        TextEdit first= (TextEdit)children.get(0);
+        TextEdit last= (TextEdit)children.get(children.size() - 1);
+        return last.getOffset() - first.getOffset() + last.getLength();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final bool covers(TextEdit other) {
+        if (fDefined)
+            return super.covers(other);
+        // an undefined multiple text edit covers everything
+        return true;
+    }
+
+    /*
+     * @see dwtx.text.edits.TextEdit#canZeroLengthCover()
+     */
+    protected bool canZeroLengthCover() {
+        return true;
+    }
+
+    /*
+     * @see TextEdit#copy
+     */
+    protected TextEdit doCopy() {
+        Assert.isTrue(MultiTextEdit.class is getClass(), "Subclasses must reimplement copy0"); //$NON-NLS-1$
+        return new MultiTextEdit(this);
+    }
+
+    /*
+     * @see TextEdit#accept0
+     */
+    protected void accept0(TextEditVisitor visitor) {
+        bool visitChildren= visitor.visit(this);
+        if (visitChildren) {
+            acceptChildren(visitor);
+        }
+    }
+
+    /*
+     * @see dwtx.text.edits.TextEdit#adjustOffset(int)
+     * @since 3.1
+     */
+    void adjustOffset(int delta) {
+        if (fDefined)
+            super.adjustOffset(delta);
+    }
+
+    /*
+     * @see dwtx.text.edits.TextEdit#adjustLength(int)
+     * @since 3.1
+     */
+    void adjustLength(int delta) {
+        if (fDefined)
+            super.adjustLength(delta);
+    }
+
+    /*
+     * @see TextEdit#performConsistencyCheck
+     */
+    void performConsistencyCheck(TextEditProcessor processor, IDocument document) throws MalformedTreeException {
+        checkIntegrity();
+    }
+
+    /*
+     * @see TextEdit#performDocumentUpdating
+     */
+    int performDocumentUpdating(IDocument document) throws BadLocationException {
+        fDelta= 0;
+        return fDelta;
+    }
+
+    /*
+     * @see TextEdit#deleteChildren
+     */
+    bool deleteChildren() {
+        return false;
+    }
+
+    void aboutToBeAdded(TextEdit parent) {
+        defineRegion(parent.getOffset());
+    }
+
+    void defineRegion(int parentOffset) {
+        if (fDefined)
+            return;
+        if (hasChildren()) {
+            IRegion region= getCoverage(getChildren());
+            internalSetOffset(region.getOffset());
+            internalSetLength(region.getLength());
+        } else {
+            internalSetOffset(parentOffset);
+            internalSetLength(0);
+        }
+        fDefined= true;
+    }
+
+    /*
+     * @see dwtx.text.edits.TextEdit#internalToString(java.lang.StringBuffer, int)
+     * @since 3.3
+     */
+    void internalToString(StringBuffer buffer, int indent) {
+        super.internalToString(buffer, indent);
+        if (! fDefined)
+            buffer.append(" [undefined]"); //$NON-NLS-1$
+    }
+}