summaryrefslogtreecommitdiffstatsabout
diff options
context:
space:
mode:
authorJohannes Schindelin2009-09-03 06:46:51 (EDT)
committer Shawn O. Pearce2009-10-06 10:43:21 (EDT)
commit1a03c864a6c82ed76ebfe9504d983f5741d75032 (patch)
tree2bea46599d37908a9e55cfc8ab266be2cbd1ab96
parentd8a3b4eb310fd8f160c858ddb5c1160a29a14546 (diff)
downloadjgit-1a03c864a6c82ed76ebfe9504d983f5741d75032.zip
jgit-1a03c864a6c82ed76ebfe9504d983f5741d75032.tar.gz
jgit-1a03c864a6c82ed76ebfe9504d983f5741d75032.tar.bz2
Add a test class for Myers' diff algorithmrefs/changes/08/8/2
Bug: 291083 Eclipse-CQ: 3559 Change-Id: I5a10946637438052e7596489b9f9de3a0c6b2066 Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
-rw-r--r--org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java109
1 files changed, 109 insertions, 0 deletions
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java
new file mode 100644
index 0000000..c91348f
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2009, Johannes E. Schindelin
+ * Copyright (C) 2009, Johannes Schindelin <johannes.schindelin@gmx.de>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ * names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.diff;
+
+import junit.framework.TestCase;
+
+public class MyersDiffTest extends TestCase {
+ public void testAtEnd() {
+ assertDiff("HELLO", "HELL", " -4,1 +4,0");
+ }
+
+ public void testAtStart() {
+ assertDiff("Git", "JGit", " -0,0 +0,1");
+ }
+
+ public void testSimple() {
+ assertDiff("HELLO WORLD", "LOW",
+ " -0,3 +0,0 -5,1 +2,0 -7,4 +3,0");
+ // is ambiguous, could be this, too:
+ // " -0,2 +0,0 -3,1 +1,0 -5,1 +2,0 -7,4 +3,0"
+ }
+
+ public void assertDiff(String a, String b, String edits) {
+ MyersDiff diff = new MyersDiff(toCharArray(a), toCharArray(b));
+ assertEquals(edits, toString(diff.getEdits()));
+ }
+
+ private static String toString(EditList list) {
+ StringBuilder builder = new StringBuilder();
+ for (Edit e : list)
+ builder.append(" -" + e.beginA
+ + "," + (e.endA - e.beginA)
+ + " +" + e.beginB + "," + (e.endB - e.beginB));
+ return builder.toString();
+ }
+
+ private static CharArray toCharArray(String s) {
+ return new CharArray(s);
+ }
+
+ protected static String toString(Sequence seq, int begin, int end) {
+ CharArray a = (CharArray)seq;
+ return new String(a.array, begin, end - begin);
+ }
+
+ protected static String toString(CharArray a, CharArray b,
+ int x, int k) {
+ return "(" + x + "," + (k + x)
+ + (x < 0 ? '<' :
+ (x >= a.array.length ?
+ '>' : a.array[x]))
+ + (k + x < 0 ? '<' :
+ (k + x >= b.array.length ?
+ '>' : b.array[k + x]))
+ + ")";
+ }
+
+ private static class CharArray implements Sequence {
+ char[] array;
+ public CharArray(String s) { array = s.toCharArray(); }
+ public int size() { return array.length; }
+ public boolean equals(int i, Sequence other, int j) {
+ CharArray o = (CharArray)other;
+ return array[i] == o.array[j];
+ }
+ }
+}