1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// Copyright the Browserify authors. MIT License.// Ported from https://github.com/browserify/path-browserify/import { assertEquals } from "../assert/mod.ts";import * as posix from "./posix/mod.ts";import * as windows from "./windows/mod.ts";
const slashRE = /\//g;
const pairs = [  ["", ""],  ["/path/to/file", ""],  ["/path/to/file.ext", ".ext"],  ["/path.to/file.ext", ".ext"],  ["/path.to/file", ""],  ["/path.to/.file", ""],  ["/path.to/.file.ext", ".ext"],  ["/path/to/f.ext", ".ext"],  ["/path/to/..ext", ".ext"],  ["/path/to/..", ""],  ["file", ""],  ["file.ext", ".ext"],  [".file", ""],  [".file.ext", ".ext"],  ["/file", ""],  ["/file.ext", ".ext"],  ["/.file", ""],  ["/.file.ext", ".ext"],  [".path/file.ext", ".ext"],  ["file.ext.ext", ".ext"],  ["file.", "."],  [".", ""],  ["./", ""],  [".file.ext", ".ext"],  [".file", ""],  [".file.", "."],  [".file..", "."],  ["..", ""],  ["../", ""],  ["..file.ext", ".ext"],  ["..file", ".file"],  ["..file.", "."],  ["..file..", "."],  ["...", "."],  ["...ext", ".ext"],  ["....", "."],  ["file.ext/", ".ext"],  ["file.ext//", ".ext"],  ["file/", ""],  ["file//", ""],  ["file./", "."],  ["file.//", "."],] as const;
Deno.test("posix.extname()", function () {  pairs.forEach(function (p) {    const input = p[0];    const expected = p[1];    assertEquals(expected, posix.extname(input));  });
  // On *nix, backslash is a valid name component like any other character.  assertEquals(posix.extname(".\\"), "");  assertEquals(posix.extname("..\\"), ".\\");  assertEquals(posix.extname("file.ext\\"), ".ext\\");  assertEquals(posix.extname("file.ext\\\\"), ".ext\\\\");  assertEquals(posix.extname("file\\"), "");  assertEquals(posix.extname("file\\\\"), "");  assertEquals(posix.extname("file.\\"), ".\\");  assertEquals(posix.extname("file.\\\\"), ".\\\\");});
Deno.test("windows.extname()", function () {  pairs.forEach(function (p) {    const input = p[0].replace(slashRE, "\\");    const expected = p[1];    assertEquals(expected, windows.extname(input));    assertEquals(expected, windows.extname("C:" + input));  });
  // On Windows, backslash is a path separator.  assertEquals(windows.extname(".\\"), "");  assertEquals(windows.extname("..\\"), "");  assertEquals(windows.extname("file.ext\\"), ".ext");  assertEquals(windows.extname("file.ext\\\\"), ".ext");  assertEquals(windows.extname("file\\"), "");  assertEquals(windows.extname("file\\\\"), "");  assertEquals(windows.extname("file.\\"), ".");  assertEquals(windows.extname("file.\\\\"), ".");});