--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/TabsToSpacesConverter.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,99 @@
+/*******************************************************************************
+ * Copyright (c) 2007 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.jface.text.TabsToSpacesConverter;
+
+import dwt.dwthelper.utils;
+
+
+/**
+ * Auto edit strategy that converts tabs into spaces.
+ * <p>
+ * Clients usually instantiate and configure this class but
+ * can also extend it in their own subclass.
+ * </p>
+ * 
+ * @since 3.3
+ */
+public class TabsToSpacesConverter : IAutoEditStrategy {
+
+    private int fTabRatio;
+    private ILineTracker fLineTracker;
+
+
+    public void setNumberOfSpacesPerTab(int ratio) {
+        fTabRatio= ratio;
+    }
+
+    public void setLineTracker(ILineTracker lineTracker) {
+        fLineTracker= lineTracker;
+    }
+
+    private int insertTabString(StringBuffer buffer, int offsetInLine) {
+
+        if (fTabRatio is 0)
+            return 0;
+
+        int remainder= offsetInLine % fTabRatio;
+        remainder= fTabRatio - remainder;
+        for (int i= 0; i < remainder; i++)
+            buffer.append(' ');
+        return remainder;
+    }
+
+    public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
+        String text= command.text;
+        if (text is null)
+            return;
+
+        int index= text.indexOf('\t');
+        if (index > -1) {
+
+            StringBuffer buffer= new StringBuffer();
+
+            fLineTracker.set(command.text);
+            int lines= fLineTracker.getNumberOfLines();
+
+            try {
+
+                for (int i= 0; i < lines; i++) {
+
+                    int offset= fLineTracker.getLineOffset(i);
+                    int endOffset= offset + fLineTracker.getLineLength(i);
+                    String line= text.substring(offset, endOffset);
+
+                    int position= 0;
+                    if (i is 0) {
+                        IRegion firstLine= document.getLineInformationOfOffset(command.offset);
+                        position= command.offset - firstLine.getOffset();
+                    }
+
+                    int length= line.length();
+                    for (int j= 0; j < length; j++) {
+                        char c= line.charAt(j);
+                        if (c is '\t') {
+                            position += insertTabString(buffer, position);
+                        } else {
+                            buffer.append(c);
+                            ++ position;
+                        }
+                    }
+
+                }
+
+                command.text= buffer.toString();
+
+            } catch (BadLocationException x) {
+            }
+        }
+    }
+}