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