1 ///////////////////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
3 // Copyright (C) 2001-2026 the original author or authors.
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ///////////////////////////////////////////////////////////////////////////////////////////////
19
20 package com.puppycrawl.tools.checkstyle;
21
22 import java.io.File;
23 import java.io.IOException;
24 import java.nio.file.Files;
25 import java.nio.file.Path;
26 import java.util.Locale;
27 import java.util.stream.Collectors;
28 import java.util.stream.Stream;
29
30 import org.junit.jupiter.api.BeforeEach;
31
32 public abstract class AbstractPathTestSupport {
33
34 // we are using positive lookahead here, to convert \r\n to \n
35 // and \\r\\n to \\n (for parse tree dump files),
36 // by replacing the full match with the empty string
37 private static final String CR_FOLLOWED_BY_LF_REGEX = "(?x)\\\\r(?=\\\\n)|\\r(?=\\n)";
38
39 private static final String EOL = System.lineSeparator();
40
41 /**
42 * Returns the exact location for the package where the file is present.
43 *
44 * @return path for the package name for the file.
45 */
46 public abstract String getPackageLocation();
47
48 /**
49 * Sets the English locale for all tests.
50 * Otherwise, some tests failed in other locales.
51 */
52 @BeforeEach
53 public void setEnglishLocale() {
54 Locale.setDefault(Locale.ENGLISH);
55 }
56
57 /**
58 * Retrieves the name of the folder location for resources.
59 *
60 * @return The name of the folder.
61 */
62 protected String getResourceLocation() {
63 return "test";
64 }
65
66 /**
67 * Returns canonical path for the file with the given file name.
68 * The path is formed base on the root location.
69 * This implementation uses 'src/test/resources/' as a root location.
70 *
71 * @param filename file name.
72 * @return canonical path for the file name.
73 * @throws IOException if I/O exception occurs while forming the path.
74 */
75 protected final String getPath(String filename) throws IOException {
76 return new File("src/" + getResourceLocation() + "/resources/" + getPackageLocation() + "/"
77 + filename).getCanonicalPath();
78 }
79
80 /**
81 * Returns the path for resources for the given file name.
82 *
83 * @param filename name of the file.
84 * @return the path for resources for the given file based on its package location.
85 */
86 protected final String getResourcePath(String filename) {
87 return "/" + getPackageLocation() + "/" + filename;
88 }
89
90 /**
91 * Reads the contents of a file.
92 *
93 * @param filename the name of the file whose contents are to be read
94 * @return contents of the file with all {@code \r\n} replaced by {@code \n}
95 * @throws IOException if I/O exception occurs while reading
96 * @noinspection RedundantThrows
97 * @noinspectionreason RedundantThrows - false positive
98 */
99 protected static String readFile(String filename) throws IOException {
100 return toLfLineEnding(Files.readString(Path.of(filename)));
101 }
102
103 /**
104 * Join given strings with {@link #EOL} delimiter and add EOL at the end.
105 *
106 * @param strings strings to join
107 * @return joined strings
108 */
109 public static String addEndOfLine(String... strings) {
110 return Stream.of(strings).collect(Collectors.joining(EOL, "", EOL));
111 }
112
113 /**
114 * Returns a string containing "\r\n" converted to "\n" and "\\r\\n" converted to "\\n"
115 * by replacing with empty string.
116 *
117 * @param text the text string.
118 * @return the converted text string.
119 */
120 protected static String toLfLineEnding(String text) {
121 return text.replaceAll(CR_FOLLOWED_BY_LF_REGEX, "");
122 }
123
124 }