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