1/*
2 * Copyright 2014, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.util;
33
34import javax.annotation.Nonnull;
35import java.util.regex.Matcher;
36import java.util.regex.Pattern;
37
38public class TextUtils {
39    private static String newline = System.getProperty("line.separator");
40
41    @Nonnull
42    public static String normalizeNewlines(@Nonnull String source) {
43        return normalizeNewlines(source, newline);
44    }
45
46    @Nonnull
47    public static String normalizeNewlines(@Nonnull String source, String newlineValue) {
48        return source.replace("\r", "").replace("\n", newlineValue);
49    }
50
51    @Nonnull
52    public static String normalizeWhitespace(@Nonnull String source) {
53        // Go to native system new lines so that ^/$ work correctly
54        source = normalizeNewlines(source);
55
56        // Remove all suffix/prefix whitespace
57        Pattern pattern = Pattern.compile("((^[ \t]+)|([ \t]+$))", Pattern.MULTILINE);
58        Matcher matcher = pattern.matcher(source);
59        source = matcher.replaceAll("");
60
61        // Remove all empty lines
62        Pattern pattern2 = Pattern.compile("^\r?\n?", Pattern.MULTILINE);
63        Matcher matcher2 = pattern2.matcher(source);
64        source = matcher2.replaceAll("");
65
66        // Remove a trailing new line, if present
67        Pattern pattern3 = Pattern.compile("\r?\n?$");
68        Matcher matcher3 = pattern3.matcher(source);
69        source = matcher3.replaceAll("");
70
71        // Go back to unix-style \n newlines
72        source = normalizeNewlines(source, "\n");
73        return source;
74    }
75
76    @Nonnull
77    public static String stripComments(@Nonnull String source) {
78        Pattern pattern = Pattern.compile("#(.*)");
79        Matcher matcher = pattern.matcher(source);
80        return matcher.replaceAll("");
81    }
82}
83