--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/rules/WordPatternRule.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * 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.WordPatternRule;
+
+import dwt.dwthelper.utils;
+
+
+import dwtx.core.runtime.Assert;
+
+
+
+/**
+ * A specific single line rule which stipulates that the start
+ * and end sequence occur within a single word, as defined by a word detector.
+ *
+ * @see IWordDetector
+ */
+public class WordPatternRule : SingleLineRule {
+
+    /** The word detector used by this rule */
+    protected IWordDetector fDetector;
+    /** The internal buffer used for pattern detection */
+    private StringBuffer fBuffer= new StringBuffer();
+
+    /**
+     * Creates a rule for the given starting and ending word
+     * pattern which, if detected, will return the specified token.
+     * A word detector is used to identify words.
+     *
+     * @param detector the word detector to be used
+     * @param startSequence the start sequence of the word pattern
+     * @param endSequence the end sequence of the word pattern
+     * @param token the token to be returned on success
+     */
+    public WordPatternRule(IWordDetector detector, String startSequence, String endSequence, IToken token) {
+        this(detector, startSequence, endSequence, token, (char)0);
+    }
+
+    /**
+    /**
+     * Creates a rule for the given starting and ending word
+     * pattern which, if detected, will return the specified token.
+     * A word detector is used to identify words.
+     * Any character which follows the given escapeCharacter will be ignored.
+     *
+     * @param detector the word detector to be used
+     * @param startSequence the start sequence of the word pattern
+     * @param endSequence the end sequence of the word pattern
+     * @param token the token to be returned on success
+     * @param escapeCharacter the escape character
+     */
+    public WordPatternRule(IWordDetector detector, String startSequence, String endSequence, IToken token, char escapeCharacter) {
+        super(startSequence, endSequence, token, escapeCharacter);
+        Assert.isNotNull(detector);
+        fDetector= detector;
+    }
+
+    /**
+     * Returns whether the end sequence was detected.
+     * The rule acquires the rest of the word, using the
+     * provided word detector, and tests to determine if
+     * it ends with the end sequence.
+     *
+     * @param scanner the scanner to be used
+     * @return <code>true</code> if the word ends on the given end sequence
+     */
+    protected bool endSequenceDetected(ICharacterScanner scanner) {
+        fBuffer.setLength(0);
+        int c= scanner.read();
+        while (fDetector.isWordPart((char) c)) {
+            fBuffer.append((char) c);
+            c= scanner.read();
+        }
+        scanner.unread();
+
+        if (fBuffer.length() >= fEndSequence.length) {
+            for (int i=fEndSequence.length - 1, j= fBuffer.length() - 1; i >= 0; i--, j--) {
+                if (fEndSequence[i] !is fBuffer.charAt(j)) {
+                    unreadBuffer(scanner);
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        unreadBuffer(scanner);
+        return false;
+    }
+
+    /**
+     * Returns the characters in the buffer to the scanner.
+     * Note that the rule must also return the characters
+     * read in as part of the start sequence expect the first one.
+     *
+     * @param scanner the scanner to be used
+     */
+    protected void unreadBuffer(ICharacterScanner scanner) {
+        fBuffer.insert(0, fStartSequence);
+        for (int i= fBuffer.length() - 1; i > 0; i--)
+            scanner.unread();
+    }
+}