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/*
* Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 8029800 8043186 8313693
* @summary Unit test StringUtils
* @modules jdk.compiler/com.sun.tools.javac.util
* @run main StringUtilsTest
*/
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import com.sun.tools.javac.util.StringUtils;
import com.sun.tools.javac.util.StringUtils.DamerauLevenshteinDistance;
public class StringUtilsTest {
public static void main(String... args) throws Exception {
new StringUtilsTest().run();
}
void run() throws Exception {
Locale.setDefault(Locale.of("tr", "TR"));
//verify the properties of the default locale:
assertEquals("\u0131", "I".toLowerCase());
assertEquals("\u0130", "i".toUpperCase());
//verify the StringUtils.toLowerCase/toUpperCase do what they should:
assertEquals("i", StringUtils.toLowerCase("I"));
assertEquals("I", StringUtils.toUpperCase("i"));
//verify StringUtils.caseInsensitiveIndexOf works:
assertEquals(2, StringUtils.indexOfIgnoreCase(" lookFor", "lookfor"));
assertEquals(11, StringUtils.indexOfIgnoreCase(" lookFor LOOKfor", "lookfor", 11));
assertEquals(2, StringUtils.indexOfIgnoreCase("\u0130\u0130lookFor", "lookfor"));
//verify Damerau-Levenshtein
assertEquals(3, DamerauLevenshteinDistance.of("kitten", "sitting"));
// note that the restricted Damerau-Levenshtein distance would be 3, not 2:
assertEquals(2, DamerauLevenshteinDistance.of("ca", "abc"));
//verify strings comprising only non-LATIN1 characters
assertEquals(1, DamerauLevenshteinDistance.of("\u0438\u044e\u043d\u044c",
"\u0438\u044e\u043b\u044c"));
//verify strings comprising mixed characters: non-LATIN1 and ASCII
// it's important to start with ASCII characters, so that we
// test switching a storage (see current implementation)
assertEquals(2, DamerauLevenshteinDistance.of("c\u043ede", "cod\u0435"));
//verify metric properties
for (String a : List.of("", "a", "b", "abc")) {
for (String b : List.of("", "a", "b", "abc")) {
assertNonNegativity(a, b);
assertSymmetry(a, b);
}
}
for (String a : List.of("", "a", "b", "c")) {
for (String b : List.of("ab", "ac", "bc")) {
for (String c : List.of("abc", "bca", "cab")) {
assertTriangleInequality(a, b, c);
assertTriangleInequality(b, c, a);
assertTriangleInequality(c, a, b);
}
}
}
}
private void assertNonNegativity(String a, String b) {
if (a.equals(b)) {
assertEquals(0, DamerauLevenshteinDistance.of(a, b));
} else {
assertTrue(DamerauLevenshteinDistance.of(a, b) > 0);
}
}
private void assertSymmetry(String a, String b) {
assertEquals(DamerauLevenshteinDistance.of(a, b),
DamerauLevenshteinDistance.of(b, a));
}
private void assertTriangleInequality(String a, String b, String c) {
int ab = DamerauLevenshteinDistance.of(a, b);
int bc = DamerauLevenshteinDistance.of(b, c);
int ac = DamerauLevenshteinDistance.of(a, c);
assertTrue(ab + bc >= ac);
}
void assertEquals(String expected, String actual) {
if (!Objects.equals(expected, actual)) {
throw new IllegalStateException("expected=" + expected + "; actual=" + actual);
}
}
void assertEquals(int expected, int actual) {
if (expected != actual) {
throw new IllegalStateException("expected=" + expected + "; actual=" + actual);
}
}
void assertTrue(boolean cond) {
if (!cond) {
throw new IllegalStateException();
}
}
}
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