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 }
57
58 /*
59 * Test String#align() functionality.
60 */
61 static void test1() {
62 for (String prefix : ENDS) {
63 for (String suffix : ENDS) {
64 for (String middle : MIDDLES) {
65 {
66 String input = prefix + " abc \n" + middle + "\n def \n" + suffix;
67 String output = input.align();
68
69 String[] inLines = input.split("\\R");
70 String[] outLines = output.split("\\R");
71
72 String[] inLinesBody = getBody(inLines);
73
74 if (inLinesBody.length < outLines.length) {
75 report("String::align()", "Result has more lines than expected", input, output);
76 } else if (inLinesBody.length > outLines.length) {
77 report("String::align()", "Result has fewer lines than expected", input, output);
78 }
79
80 int indent = -1;
81 for (int i = 0; i < inLinesBody.length; i++) {
82 String in = inLinesBody[i];
83 String out = outLines[i];
84 if (!out.isBlank()) {
85 int offset = in.indexOf(out);
86 if (offset == -1) {
87 report("String::align()", "Portions of line are missing", input, output);
88 }
89 if (indent == -1) {
90 indent = offset;
91 } else if (offset != indent) {
92 report("String::align()",
93 "Inconsistent indentation in result", input, output);
94 }
95 }
96 }
97 }
98 }
99 }
100 }
101 }
102
103 /*
104 * Test String#align(int n) functionality.
105 */
106 static void test2() {
107 for (int adjust : new int[] {-8, -7, -4, -3, -2, -1, 0, 1, 2, 3, 4, 7, 8}) {
108 for (String prefix : ENDS) {
109 for (String suffix : ENDS) {
110 for (String middle : MIDDLES) {
111 {
112 String input = prefix + " abc \n" + middle + "\n def \n" + suffix;
113 String output = input.align(adjust);
114 String expected = input.align().indent(adjust);
115
116 if (!output.equals(expected)) {
117 report("String::align(int n)",
118 "Result inconsistent with align().indent(n)", expected, output);
119 }
120 }
121 }
122 }
123 }
124 }
125 }
126
127 /*
128 * Test String#indent(int n) functionality.
129 */
130 static void test3() {
131 for (int adjust : new int[] {-8, -7, -4, -3, -2, -1, 0, 1, 2, 3, 4, 7, 8}) {
132 for (String prefix : ENDS) {
133 for (String suffix : ENDS) {
134 for (String middle : MIDDLES) {
135 String input = prefix + " abc \n" + middle + "\n def \n" + suffix;
136 String output = input.indent(adjust);
137
138 Stream<String> stream = input.lines();
139 if (adjust > 0) {
140 final String spaces = " ".repeat(adjust);
141 stream = stream.map(s -> s.isBlank() ? s : spaces + s);
142 } else if (adjust < 0) {
143 stream = stream.map(s -> s.substring(Math.min(-adjust, indexOfNonWhitespace(s))));
144 }
145 String expected = stream.collect(Collectors.joining("\n", "", "\n"));
146
147 if (!output.equals(expected)) {
148 report("String::indent(int n)",
149 "Result indentation not as expected", expected, output);
150 }
151 }
152 }
153 }
154 }
155 }
156
157 public static int indexOfNonWhitespace(String s) {
158 int left = 0;
159 while (left < s.length()) {
160 char ch = s.charAt(left);
161 if (ch != ' ' && ch != '\t' && !Character.isWhitespace(ch)) {
162 break;
163 }
164 left++;
165 }
166 return left;
167 }
168
169
170 private static String[] getBody(String[] inLines) {
171 int from = -1, to = -1;
172 for (int i = 0; i < inLines.length; i++) {
173 String line = inLines[i];
174 if (!line.isBlank()) {
175 if (from == -1) {
176 from = i;
177 }
178 to = i + 1;
179 }
180 }
181 return Arrays.copyOfRange(inLines, from, to);
182 }
183
184 /*
185 * Report difference in result.
186 */
187 static void report(String test, String message, String input, String output) {
188 System.err.println("Testing " + test + ": " + message);
189 System.err.println();
190 System.err.println("Input: length = " + input.length());
191 System.err.println("_".repeat(40));
192 System.err.print(input.replaceAll(" ", "."));
193 System.err.println("_".repeat(40));
194 System.err.println();
195 System.err.println("Output: length = " + output.length());
196 System.err.println("_".repeat(40));
197 System.err.print(output.replaceAll(" ", "."));
198 System.err.println("_".repeat(40));
199 throw new RuntimeException();
200 }
201 }