--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/templates/DocumentTemplateContext.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,193 @@
+/*******************************************************************************
+ * 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.jface.text.templates.DocumentTemplateContext;
+
+import dwt.dwthelper.utils;
+
+
+import dwtx.core.runtime.Assert;
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.IDocument;
+import dwtx.jface.text.Position;
+
+/**
+ * Instances of this class describe the context of a template as a region of
+ * a document. That region may be either specified by its offset and length, or
+ * by a <code>Position</code> which may or may not be registered with the
+ * document.
+ * <p>
+ * Clients may instantiate and extend this class.
+ * </p>
+ *
+ * @since 3.0
+ */
+public class DocumentTemplateContext : TemplateContext {
+
+    /** The text of the document. */
+    private final IDocument fDocument;
+    /**
+     * The region of the document described by this context. We store a
+     * position since clients may specify the document region as (updateable)
+     * Positions.
+     */
+    private final Position fPosition;
+    /**
+     * The original offset of this context. Will only be updated by the setter
+     * method.
+     */
+    private int fOriginalOffset;
+    /**
+     * The original length of this context. Will only be updated by the setter
+     * method.
+     */
+    private int fOriginalLength;
+
+    /**
+     * Creates a document template context.
+     *
+     * @param type the context type
+     * @param document the document this context applies to
+     * @param offset the offset of the document region
+     * @param length the length of the document region
+     */
+    public DocumentTemplateContext(TemplateContextType type, IDocument document, int offset, int length) {
+        this(type, document, new Position(offset, length));
+    }
+
+    /**
+     * Creates a document template context. The supplied <code>Position</code>
+     * will be queried to compute the <code>getStart</code> and
+     * <code>getEnd</code> methods, which will therefore answer updated
+     * position data if it is registered with the document.
+     *
+     * @param type the context type
+     * @param document the document this context applies to
+     * @param position the position describing the area of the document which
+     *        forms the template context
+     * @since 3.1
+     */
+    public DocumentTemplateContext(TemplateContextType type, IDocument document, Position position) {
+        super(type);
+
+        Assert.isNotNull(document);
+        Assert.isNotNull(position);
+        Assert.isTrue(position.getOffset() <= document.getLength());
+
+        fDocument= document;
+        fPosition= position;
+        fOriginalOffset= fPosition.getOffset();
+        fOriginalLength= fPosition.getLength();
+    }
+
+    /**
+     * Returns the document.
+     *
+     * @return the document
+     */
+    public IDocument getDocument() {
+        return fDocument;
+    }
+
+    /**
+     * Returns the completion offset within the string of the context.
+     *
+     * @return the completion offset within the string of the context
+     */
+    public int getCompletionOffset() {
+        return fOriginalOffset;
+    }
+
+    /**
+     * Sets the completion offset.
+     *
+     * @param newOffset the new completion offset
+     */
+    protected void setCompletionOffset(int newOffset) {
+        fOriginalOffset= newOffset;
+        fPosition.setOffset(newOffset);
+    }
+
+    /**
+     * Returns the completion length within the string of the context.
+     *
+     * @return the completion length within the string of the context
+     */
+    public int getCompletionLength() {
+        return fOriginalLength;
+    }
+
+    /**
+     * Sets the completion length.
+     *
+     * @param newLength the new completion length
+     */
+    protected void setCompletionLength(int newLength) {
+        fOriginalLength= newLength;
+        fPosition.setLength(newLength);
+    }
+
+    /**
+     * Returns the keyword which triggered template insertion.
+     *
+     * @return the keyword which triggered template insertion
+     */
+    public String getKey() {
+        int offset= getStart();
+        int length= getEnd() - offset;
+        try {
+            return fDocument.get(offset, length);
+        } catch (BadLocationException e) {
+            return ""; //$NON-NLS-1$
+        }
+    }
+
+    /**
+     * Returns the beginning offset of the keyword.
+     *
+     * @return the beginning offset of the keyword
+     */
+    public int getStart() {
+        return fPosition.getOffset();
+    }
+
+    /**
+     * Returns the end offset of the keyword.
+     *
+     * @return the end offset of the keyword
+     */
+    public int getEnd() {
+        return fPosition.getOffset() + fPosition.getLength();
+    }
+
+    /*
+     * @see dwtx.jface.text.templates.TemplateContext#canEvaluate(dwtx.jface.text.templates.Template)
+     */
+    public bool canEvaluate(Template template) {
+        return true;
+    }
+
+    /*
+     * @see dwtx.jface.text.templates.TemplateContext#evaluate(dwtx.jface.text.templates.Template)
+     */
+    public TemplateBuffer evaluate(Template template) throws BadLocationException, TemplateException {
+        if (!canEvaluate(template))
+            return null;
+
+        TemplateTranslator translator= new TemplateTranslator();
+        TemplateBuffer buffer= translator.translate(template);
+
+        getContextType().resolve(buffer, this);
+
+        return buffer;
+    }
+}