--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/IDocumentInformationMappingExtension.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 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.IDocumentInformationMappingExtension;
+
+import dwt.dwthelper.utils;
+
+/**
+ * Extension to {@link dwtx.jface.text.IDocumentInformationMapping}.
+ * <p>
+ * Extends the information available in the mapping by providing explicit access
+ * to the isomorphic portion of the basically homomorphic information mapping.
+ *
+ * @see dwtx.jface.text.IDocumentInformationMapping
+ * @since 3.0
+ */
+public interface IDocumentInformationMappingExtension {
+
+    /**
+     * Adheres to
+     * <code>originRegion=toOriginRegion(toExactImageRegion(originRegion))</code>,
+     * if <code>toExactImageRegion(originRegion) !is null</code>. Returns
+     * <code>null</code> if there is no image for the given origin region.
+     *
+     * @param originRegion the origin region
+     * @return the exact image region or <code>null</code>
+     * @throws BadLocationException if origin region is not a valid region in
+     *             the origin document
+     */
+    IRegion toExactImageRegion(IRegion originRegion) throws BadLocationException;
+
+    /**
+     * Returns the segments of the image document that exactly correspond to the
+     * given region of the original document. Returns <code>null</code> if
+     * there are no such image regions.
+     *
+     * @param originRegion the region in the origin document
+     * @return the segments in the image document or <code>null</code>
+     * @throws BadLocationException in case the given origin region is not valid
+     *             in the original document
+     */
+    IRegion[] toExactImageRegions(IRegion originRegion) throws BadLocationException;
+
+    /**
+     * Returns the fragments of the original document that exactly correspond to
+     * the given region of the image document.
+     *
+     * @param imageRegion the region in the image document
+     * @return the fragments in the origin document
+     * @throws BadLocationException in case the given image region is not valid
+     *             in the image document
+     */
+    IRegion[] toExactOriginRegions(IRegion imageRegion) throws BadLocationException;
+
+    /**
+     * Returns the length of the image document.
+     *
+     * @return the length of the image document
+     */
+    int getImageLength();
+
+    /**
+     * Returns the maximal sub-regions of the given origin region which are
+     * completely covered. I.e. each offset in a sub-region has a corresponding
+     * image offset. Returns <code>null</code> if there are no such
+     * sub-regions.
+     *
+     * @param originRegion the region in the origin document
+     * @return the sub-regions with complete coverage or <code>null</code>
+     * @throws BadLocationException in case the given origin region is not valid
+     *             in the original document
+     */
+    IRegion[] getExactCoverage(IRegion originRegion) throws BadLocationException;
+}