--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/rules/DefaultDamagerRepairer.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.jface.text.rules.DefaultDamagerRepairer;
+
+import dwt.dwthelper.utils;
+
+
+
+
+
+import dwt.DWT;
+import dwt.custom.StyleRange;
+import dwtx.core.runtime.Assert;
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.DocumentEvent;
+import dwtx.jface.text.IDocument;
+import dwtx.jface.text.IRegion;
+import dwtx.jface.text.ITypedRegion;
+import dwtx.jface.text.Region;
+import dwtx.jface.text.TextAttribute;
+import dwtx.jface.text.TextPresentation;
+import dwtx.jface.text.presentation.IPresentationDamager;
+import dwtx.jface.text.presentation.IPresentationRepairer;
+
+
+/**
+ * A standard implementation of a syntax driven presentation damager
+ * and presentation repairer. It uses a token scanner to scan
+ * the document and to determine its damage and new text presentation.
+ * The tokens returned by the scanner are supposed to return text attributes
+ * as their data.
+ *
+ * @see ITokenScanner
+ * @since 2.0
+ */
+public class DefaultDamagerRepairer : IPresentationDamager, IPresentationRepairer {
+
+
+    /** The document this object works on */
+    protected IDocument fDocument;
+    /** The scanner it uses */
+    protected ITokenScanner fScanner;
+    /** The default text attribute if non is returned as data by the current token */
+    protected TextAttribute fDefaultTextAttribute;
+
+    /**
+     * Creates a damager/repairer that uses the given scanner and returns the given default
+     * text attribute if the current token does not carry a text attribute.
+     *
+     * @param scanner the token scanner to be used
+     * @param defaultTextAttribute the text attribute to be returned if non is specified by the current token,
+     *          may not be <code>null</code>
+     *
+     * @deprecated use DefaultDamagerRepairer(ITokenScanner) instead
+     */
+    public DefaultDamagerRepairer(ITokenScanner scanner, TextAttribute defaultTextAttribute) {
+
+        Assert.isNotNull(defaultTextAttribute);
+
+        fScanner= scanner;
+        fDefaultTextAttribute= defaultTextAttribute;
+    }
+
+    /**
+     * Creates a damager/repairer that uses the given scanner. The scanner may not be <code>null</code>
+     * and is assumed to return only token that carry text attributes.
+     *
+     * @param scanner the token scanner to be used, may not be <code>null</code>
+     */
+    public DefaultDamagerRepairer(ITokenScanner scanner) {
+
+        Assert.isNotNull(scanner);
+
+        fScanner= scanner;
+        fDefaultTextAttribute= new TextAttribute(null);
+    }
+
+    /*
+     * @see IPresentationDamager#setDocument(IDocument)
+     * @see IPresentationRepairer#setDocument(IDocument)
+     */
+    public void setDocument(IDocument document) {
+        fDocument= document;
+    }
+
+
+    //---- IPresentationDamager
+
+    /**
+     * Returns the end offset of the line that contains the specified offset or
+     * if the offset is inside a line delimiter, the end offset of the next line.
+     *
+     * @param offset the offset whose line end offset must be computed
+     * @return the line end offset for the given offset
+     * @exception BadLocationException if offset is invalid in the current document
+     */
+    protected int endOfLineOf(int offset) throws BadLocationException {
+
+        IRegion info= fDocument.getLineInformationOfOffset(offset);
+        if (offset <= info.getOffset() + info.getLength())
+            return info.getOffset() + info.getLength();
+
+        int line= fDocument.getLineOfOffset(offset);
+        try {
+            info= fDocument.getLineInformation(line + 1);
+            return info.getOffset() + info.getLength();
+        } catch (BadLocationException x) {
+            return fDocument.getLength();
+        }
+    }
+
+    /*
+     * @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent, bool)
+     */
+    public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent e, bool documentPartitioningChanged) {
+
+        if (!documentPartitioningChanged) {
+            try {
+
+                IRegion info= fDocument.getLineInformationOfOffset(e.getOffset());
+                int start= Math.max(partition.getOffset(), info.getOffset());
+
+                int end= e.getOffset() + (e.getText() is null ? e.getLength() : e.getText().length());
+
+                if (info.getOffset() <= end && end <= info.getOffset() + info.getLength()) {
+                    // optimize the case of the same line
+                    end= info.getOffset() + info.getLength();
+                } else
+                    end= endOfLineOf(end);
+
+                end= Math.min(partition.getOffset() + partition.getLength(), end);
+                return new Region(start, end - start);
+
+            } catch (BadLocationException x) {
+            }
+        }
+
+        return partition;
+    }
+
+    //---- IPresentationRepairer
+
+    /*
+     * @see IPresentationRepairer#createPresentation(TextPresentation, ITypedRegion)
+     */
+    public void createPresentation(TextPresentation presentation, ITypedRegion region) {
+
+        if (fScanner is null) {
+            // will be removed if deprecated constructor will be removed
+            addRange(presentation, region.getOffset(), region.getLength(), fDefaultTextAttribute);
+            return;
+        }
+
+        int lastStart= region.getOffset();
+        int length= 0;
+        bool firstToken= true;
+        IToken lastToken= Token.UNDEFINED;
+        TextAttribute lastAttribute= getTokenTextAttribute(lastToken);
+
+        fScanner.setRange(fDocument, lastStart, region.getLength());
+
+        while (true) {
+            IToken token= fScanner.nextToken();
+            if (token.isEOF())
+                break;
+
+            TextAttribute attribute= getTokenTextAttribute(token);
+            if (lastAttribute !is null && lastAttribute.equals(attribute)) {
+                length += fScanner.getTokenLength();
+                firstToken= false;
+            } else {
+                if (!firstToken)
+                    addRange(presentation, lastStart, length, lastAttribute);
+                firstToken= false;
+                lastToken= token;
+                lastAttribute= attribute;
+                lastStart= fScanner.getTokenOffset();
+                length= fScanner.getTokenLength();
+            }
+        }
+
+        addRange(presentation, lastStart, length, lastAttribute);
+    }
+
+    /**
+     * Returns a text attribute encoded in the given token. If the token's
+     * data is not <code>null</code> and a text attribute it is assumed that
+     * it is the encoded text attribute. It returns the default text attribute
+     * if there is no encoded text attribute found.
+     *
+     * @param token the token whose text attribute is to be determined
+     * @return the token's text attribute
+     */
+    protected TextAttribute getTokenTextAttribute(IToken token) {
+        Object data= token.getData();
+        if (data instanceof TextAttribute)
+            return (TextAttribute) data;
+        return fDefaultTextAttribute;
+    }
+
+    /**
+     * Adds style information to the given text presentation.
+     *
+     * @param presentation the text presentation to be extended
+     * @param offset the offset of the range to be styled
+     * @param length the length of the range to be styled
+     * @param attr the attribute describing the style of the range to be styled
+     */
+    protected void addRange(TextPresentation presentation, int offset, int length, TextAttribute attr) {
+        if (attr !is null) {
+            int style= attr.getStyle();
+            int fontStyle= style & (DWT.ITALIC | DWT.BOLD | DWT.NORMAL);
+            StyleRange styleRange= new StyleRange(offset, length, attr.getForeground(), attr.getBackground(), fontStyle);
+            styleRange.strikeout= (style & TextAttribute.STRIKETHROUGH) !is 0;
+            styleRange.underline= (style & TextAttribute.UNDERLINE) !is 0;
+            styleRange.font= attr.getFont();
+            presentation.addStyleRange(styleRange);
+        }
+    }
+}
+
+