[JGIT PATCH 3/5] Add a test class for Myers' diff algorithm
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
.../tst/org/spearce/jgit/diff/MyersDiffTest.java | 103 ++++++++++++++++++++
1 files changed, 103 insertions(+), 0 deletions(-)
create mode 100644 org.spearce.jgit.test/tst/org/spearce/jgit/diff/MyersDiffTest.java
diff --git a/org.spearce.jgit.test/tst/org/spearce/jgit/diff/MyersDiffTest.java b/org.spearce.jgit.test/tst/org/spearce/jgit/diff/MyersDiffTest.java
new file mode 100644
index 0000000..0d62790
--- /dev/null
+++ b/org.spearce.jgit.test/tst/org/spearce/jgit/diff/MyersDiffTest.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2009, Johannes E. Schindelin
+ *
+ * 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 Git Development Community 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.spearce.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));
+System.err.println("edits: " + diff.getEdits());
+ 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];
+ }
+ }
+}
--
1.6.4.297.gcb4cc
Johannes Schindelin <johannes.schindelin@gmx.de>