--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/EncodeDirPathHelper.java	Tue May 14 17:31:35 2013 +0200
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2013 TMate Software Ltd
+ *  
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * For information on how to redistribute this software under
+ * the terms of a license other than GNU General Public License
+ * contact TMate Software at support@hg4j.com
+ */
+package org.tmatesoft.hg.internal;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.tmatesoft.hg.util.PathRewrite;
+
+/**
+ * <blockquote cite="http://mercurial.selenic.com/wiki/FileFormats#data.2F">Directory names ending in .i or .d have .hg appended</blockquote>
+ *  
+ * @see http://mercurial.selenic.com/wiki/FileFormats#data.2F
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+final class EncodeDirPathHelper implements PathRewrite {
+	private final Pattern suffix2replace;
+	
+	public EncodeDirPathHelper() {
+		suffix2replace = Pattern.compile("\\.([id]|hg)/");
+	}
+
+	public CharSequence rewrite(CharSequence p) {
+		Matcher suffixMatcher = suffix2replace.matcher(p);
+		CharSequence path;
+		// Matcher.replaceAll, but without extra toString
+		boolean found = suffixMatcher.find();
+		if (found) {
+			StringBuffer sb = new StringBuffer(p.length()  + 20);
+			do {
+				suffixMatcher.appendReplacement(sb, ".$1.hg/");
+			} while (found = suffixMatcher.find());
+			suffixMatcher.appendTail(sb);
+			path = sb;
+		} else {
+			path = p;
+		}
+		return path;
+	}
+
+}