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 import java.util.List;
25 import java.util.stream.Collectors;
26 import java.util.stream.IntStream;
27 
28 /**
29  * @test
30  * @summary Basic strip, stripLeading, stripTrailing functionality
31  * @bug 8200377
32  * @run main/othervm Strip
33  */
34 
35 public class Strip {
main(String... arg)36    public static void main(String... arg) {
37         testStrip();
38         testWhitespace();
39     }
40 
41     /*
42      * Test basic stripping routines
43      */
testStrip()44     static void testStrip() {
45         equal("   abc   ".strip(), "abc");
46         equal("   abc   ".stripLeading(), "abc   ");
47         equal("   abc   ".stripTrailing(), "   abc");
48         equal("   abc\u2022   ".strip(), "abc\u2022");
49         equal("   abc\u2022   ".stripLeading(), "abc\u2022   ");
50         equal("   abc\u2022   ".stripTrailing(), "   abc\u2022");
51         equal("".strip(), "");
52         equal("".stripLeading(), "");
53         equal("".stripTrailing(), "");
54         equal("\b".strip(), "\b");
55         equal("\b".stripLeading(), "\b");
56         equal("\b".stripTrailing(), "\b");
57     }
58 
59     /*
60      * Test full whitespace range
61      */
testWhitespace()62     static void testWhitespace() {
63         StringBuilder sb = new StringBuilder(64);
64         IntStream.range(1, 0xFFFF).filter(c -> Character.isWhitespace(c))
65                 .forEach(c -> sb.append((char)c));
66         String whiteSpace = sb.toString();
67 
68         String testString = whiteSpace + "abc" + whiteSpace;
69         equal(testString.strip(), "abc");
70         equal(testString.stripLeading(), "abc"  + whiteSpace);
71         equal(testString.stripTrailing(), whiteSpace + "abc");
72     }
73 
74     /*
75      * Report difference in result.
76      */
report(String message, String inputTag, String input, String outputTag, String output)77     static void report(String message, String inputTag, String input,
78                        String outputTag, String output) {
79         System.err.println(message);
80         System.err.println();
81         System.err.println(inputTag);
82         System.err.println(input.codePoints()
83                 .mapToObj(c -> (Integer)c)
84                 .collect(Collectors.toList()));
85         System.err.println();
86         System.err.println(outputTag);
87         System.err.println(output.codePoints()
88                 .mapToObj(c -> (Integer)c)
89                 .collect(Collectors.toList()));
90         throw new RuntimeException();
91     }
92 
93     /*
94      * Raise an exception if the two inputs are not equivalent.
95      */
equal(String input, String expected)96     static void equal(String input, String expected) {
97         if (input == null || expected == null || !expected.equals(input)) {
98             report("Failed equal", "Input:", input, "Expected:", expected);
99         }
100     }
101 }
102