1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package test.java.lang.String; 24 25 /* 26 * @test 27 * @summary Unit tests for String#indent 28 * @run main Indent 29 */ 30 31 import java.util.List; 32 import java.util.stream.Collectors; 33 import java.util.stream.Stream; 34 35 import org.testng.annotations.Test; 36 import static org.testng.Assert.assertEquals; 37 38 public class Indent { 39 static final List<String> ENDS = List.of("", "\n", " \n", "\n\n", "\n\n\n"); 40 static final List<String> MIDDLES = List.of( 41 "", 42 "xyz", 43 " xyz", 44 " xyz", 45 "xyz ", 46 " xyz ", 47 " xyz ", 48 "xyz\u2022", 49 " xyz\u2022", 50 "xyz\u2022 ", 51 " xyz\u2022 ", 52 " // comment" 53 ); 54 55 /* 56 * Test String#indent(int n) functionality. 57 */ 58 @Test testIndent()59 public void testIndent() { 60 for (int adjust : new int[] {-8, -7, -4, -3, -2, -1, 0, 1, 2, 3, 4, 7, 8}) { 61 for (String prefix : ENDS) { 62 for (String suffix : ENDS) { 63 for (String middle : MIDDLES) { 64 String input = prefix + " abc \n" + middle + "\n def \n" + suffix; 65 String output = input.indent(adjust); 66 67 Stream<String> stream = input.lines(); 68 if (adjust > 0) { 69 final String spaces = " ".repeat(adjust); 70 stream = stream.map(s -> spaces + s); 71 } else if (adjust < 0) { 72 stream = stream.map(s -> s.substring(Math.min(-adjust, indexOfNonWhitespace(s)))); 73 } 74 String expected = stream.collect(Collectors.joining("\n", "", "\n")); 75 76 assertEquals(output, expected); 77 } 78 } 79 } 80 } 81 } 82 indexOfNonWhitespace(String s)83 public static int indexOfNonWhitespace(String s) { 84 int left = 0; 85 while (left < s.length()) { 86 char ch = s.charAt(left); 87 if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) { 88 break; 89 } 90 left++; 91 } 92 return left; 93 } 94 } 95