WhitespaceTest.java revision 2740:c956c25f9334 
1/*
2 * Copyright (c) 2014, 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 * @bug 8033581 8033798 8033726
27 * @summary Check whitespace in generated output
28 */
29
30import java.io.*;
31import java.util.*;
32
33public class WhitespaceTest {
34    public static void main(String... args) throws Exception {
35        new WhitespaceTest().run();
36    }
37
38    void run() throws Exception {
39        test("-v", "java.lang.String");
40        test("-XDtab:1", "-v", "java.lang.String");
41
42        String testClasses = System.getProperty("test.classes");
43        for (int i = 10; i < 40; i++)
44            test("-XDtab:" + i, "-v", "-classpath", testClasses, "WhitespaceTest$HelloWorld");
45
46        if (errors > 0)
47            throw new Exception(errors + " errors found");
48    }
49
50    void test(String... args) throws Exception {
51        // need to avoid "//" appearing as a constant in the constant pool
52        String slash = "/";
53        String doubleSlash = slash + slash;
54        System.out.println("test: " + Arrays.asList(args));
55        String out = javap(args);
56        for (String line: out.split("[\r\n]+")) {
57            if (line.endsWith(" "))
58                error("line has trailing whitespace: " + line);
59            int comment = line.indexOf(doubleSlash);
60            if (comment > 0 && line.charAt(comment - 1) != ' ') {
61                // make allowance for URLs
62                if (!line.matches(".*\\bfile:/{3}.*"))
63                    error("no space before comment: " + line);
64            }
65            if (line.matches(" +}"))
66                error("bad indentation: " + line);
67        }
68    }
69
70    String javap(String... args) throws Exception {
71        StringWriter sw = new StringWriter();
72        PrintWriter out = new PrintWriter(sw);
73        int rc = com.sun.tools.javap.Main.run(args, out);
74        out.close();
75        System.out.println(sw.toString());
76        if (rc < 0)
77            throw new Exception("javap exited, rc=" + rc);
78        return sw.toString();
79    }
80
81    void error(String msg) {
82        System.out.println("Error: " + msg);
83        errors++;
84    }
85
86    int errors;
87
88    // small class to test repeatedly with different tab values
89    static class HelloWorld {
90        public static void main(String... args) {
91            System.out.println("Hello World!");
92        }
93    }
94}
95
96
97