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 24 /* 25 * @test 26 * @summary Unit tests for String#align and String#indent 27 * @run main AlignIndent 28 */ 29 30 import java.util.Arrays; 31 import java.util.List; 32 import java.util.stream.Collectors; 33 import java.util.stream.Stream; 34 35 public class AlignIndent { 36 static final List<String> ENDS = List.of("", "\n", " \n", "\n\n", "\n\n\n"); 37 static final List<String> MIDDLES = List.of( 38 "", 39 "xyz", 40 " xyz", 41 " xyz", 42 "xyz ", 43 " xyz ", 44 " xyz ", 45 "xyz\u2022", 46 " xyz\u2022", 47 "xyz\u2022 ", 48 " xyz\u2022 ", 49 " // comment" 50 ); 51 52 public static void main(String[] args) { 53 test1(); 54 test2(); 55 test3(); 56 test4(); 57 } 58 59 /* 60 * Test String#align() functionality. 61 */ 62 static void test1() { 63 for (String prefix : ENDS) { 64 for (String suffix : ENDS) { 65 for (String middle : MIDDLES) { 66 { 67 String input = prefix + " abc \n" + middle + "\n def \n" + suffix; 68 String output = input.align(); 69 70 String[] inLines = input.split("\\R"); 71 String[] outLines = output.split("\\R"); 72 73 String[] inLinesBody = getBody(inLines); 74 75 if (inLinesBody.length < outLines.length) { 76 report("String::align()", "Result has more lines than expected", input, output); 77 } else if (inLinesBody.length > outLines.length) { 78 report("String::align()", "Result has fewer lines than expected", input, output); 79 } 80 81 int indent = -1; 82 for (int i = 0; i < inLinesBody.length; i++) { 83 String in = inLinesBody[i]; 84 String out = outLines[i]; 85 if (!out.isBlank()) { 86 int offset = in.indexOf(out); 87 if (offset == -1) { 88 report("String::align()", "Portions of line are missing", input, output); 89 } 90 if (indent == -1) { 91 indent = offset; 92 } else if (offset != indent) { 93 report("String::align()", 94 "Inconsistent indentation in result", input, output); 95 } 96 } 97 } 98 } 99 } 100 } 101 } 102 } 103 104 /* 105 * Test String#align(int n) functionality. 106 */ 107 static void test2() { 108 for (int adjust : new int[] {-8, -7, -4, -3, -2, -1, 0, 1, 2, 3, 4, 7, 8}) { 109 for (String prefix : ENDS) { 110 for (String suffix : ENDS) { 111 for (String middle : MIDDLES) { 112 { 113 String input = prefix + " abc \n" + middle + "\n def \n" + suffix; 114 String output = input.align(adjust); 115 String expected = input.align().indent(adjust); 116 117 if (!output.equals(expected)) { 118 report("String::align(int n)", 119 "Result inconsistent with align().indent(n)", expected, output); 120 } 121 } 122 } 123 } 124 } 125 } 126 } 127 128 /* 129 * Test String#indent(int n) functionality. 130 */ 131 static void test3() { 132 for (int adjust : new int[] {-8, -7, -4, -3, -2, -1, 0, 1, 2, 3, 4, 7, 8}) { 133 for (String prefix : ENDS) { 134 for (String suffix : ENDS) { 135 for (String middle : MIDDLES) { 136 String input = prefix + " abc \n" + middle + "\n def \n" + suffix; 137 String output = input.indent(adjust); 138 139 Stream<String> stream = input.lines(); 140 if (adjust > 0) { 141 final String spaces = " ".repeat(adjust); 142 stream = stream.map(s -> s.isBlank() ? s : spaces + s); 143 } else if (adjust < 0) { 144 stream = stream.map(s -> s.substring(Math.min(-adjust, indexOfNonWhitespace(s)))); 145 } 146 String expected = stream.collect(Collectors.joining("\n", "", "\n")); 147 148 if (!output.equals(expected)) { 149 report("String::indent(int n)", 150 "Result indentation not as expected", expected, output); 151 } 152 } 153 } 154 } 155 } 156 } 157 158 /* 159 * JDK-8212694: Using Raw String Literals with align() and Integer.MIN_VALUE causes out of memory error 160 */ 161 static void test4() { 162 try { 163 String str = "\n A\n".align(Integer.MIN_VALUE); 164 } catch (OutOfMemoryError ex) { 165 System.err.println("align(Integer.MIN_VALUE) not clipping indentation"); 166 throw new RuntimeException(); 167 } 168 } 169 170 public static int indexOfNonWhitespace(String s) { 171 int left = 0; 172 while (left < s.length()) { 173 char ch = s.charAt(left); 174 if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) { 175 break; 176 } 177 left++; 178 } 179 return left; 180 } 181 182 183 private static String[] getBody(String[] inLines) { 184 int from = -1, to = -1; 185 for (int i = 0; i < inLines.length; i++) { 186 String line = inLines[i]; 187 if (!line.isBlank()) { 188 if (from == -1) { 189 from = i; 190 } 191 to = i + 1; 192 } 193 } 194 return Arrays.copyOfRange(inLines, from, to); 195 } 196 197 /* 198 * Report difference in result. 199 */ 200 static void report(String test, String message, String input, String output) { 201 System.err.println("Testing " + test + ": " + message); 202 System.err.println(); 203 System.err.println("Input: length = " + input.length()); 204 System.err.println("_".repeat(40)); 205 System.err.print(input.replaceAll(" ", ".")); 206 System.err.println("_".repeat(40)); 207 System.err.println(); 208 System.err.println("Output: length = " + output.length()); 209 System.err.println("_".repeat(40)); 210 System.err.print(output.replaceAll(" ", ".")); 211 System.err.println("_".repeat(40)); 212 throw new RuntimeException(); 213 } 214 }