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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
#nullable enable
using System;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Text.RegularExpressions;
namespace Emby.Server.Implementations.Library
{
/// <summary>
/// Class providing extension methods for working with paths.
/// </summary>
public static class PathExtensions
{
/// <summary>
/// Gets the attribute value.
/// </summary>
/// <param name="str">The STR.</param>
/// <param name="attribute">The attrib.</param>
/// <returns>System.String.</returns>
/// <exception cref="ArgumentException"><paramref name="str" /> or <paramref name="attribute" /> is empty.</exception>
public static string? GetAttributeValue(this string str, string attribute)
{
if (str.Length == 0)
{
throw new ArgumentException("String can't be empty.", nameof(str));
}
if (attribute.Length == 0)
{
throw new ArgumentException("String can't be empty.", nameof(attribute));
}
string srch = "[" + attribute + "=";
int start = str.IndexOf(srch, StringComparison.OrdinalIgnoreCase);
if (start != -1)
{
start += srch.Length;
int end = str.IndexOf(']', start);
return str.Substring(start, end - start);
}
// for imdbid we also accept pattern matching
if (string.Equals(attribute, "imdbid", StringComparison.OrdinalIgnoreCase))
{
var m = Regex.Match(str, "tt([0-9]{7,8})", RegexOptions.IgnoreCase);
return m.Success ? m.Value : null;
}
return null;
}
/// <summary>
/// Replaces a sub path with another sub path and normalizes the final path.
/// </summary>
/// <param name="path">The original path.</param>
/// <param name="subPath">The original sub path.</param>
/// <param name="newSubPath">The new sub path.</param>
/// <param name="newPath">The result of the sub path replacement</param>
/// <returns>The path after replacing the sub path.</returns>
/// <exception cref="ArgumentNullException"><paramref name="path" />, <paramref name="newSubPath" /> or <paramref name="newSubPath" /> is empty.</exception>
public static bool TryReplaceSubPath(this string path, string subPath, string newSubPath, [NotNullWhen(true)] out string? newPath)
{
newPath = null;
if (path.Length == 0 || subPath.Length == 0 || newSubPath.Length == 0 || subPath.Length > path.Length)
{
return false;
}
char oldDirectorySeparatorChar;
char newDirectorySeparatorChar;
// True normalization is still not possible https://github.com/dotnet/runtime/issues/2162
// The reasoning behind this is that a forward slash likely means it's a Linux path and
// so the whole path should be normalized to use / and vice versa for Windows (although Windows doesn't care much).
if (newSubPath.Contains('/', StringComparison.Ordinal))
{
oldDirectorySeparatorChar = '\\';
newDirectorySeparatorChar = '/';
}
else
{
oldDirectorySeparatorChar = '/';
newDirectorySeparatorChar = '\\';
}
path = path.Replace(oldDirectorySeparatorChar, newDirectorySeparatorChar);
subPath = subPath.Replace(oldDirectorySeparatorChar, newDirectorySeparatorChar);
// We have to ensure that the sub path ends with a directory separator otherwise we'll get weird results
// when the sub path matches a similar but in-complete subpath
var oldSubPathEndsWithSeparator = subPath[^1] == newDirectorySeparatorChar;
if (!path.StartsWith(subPath, StringComparison.OrdinalIgnoreCase)
|| (!oldSubPathEndsWithSeparator && path[subPath.Length] != newDirectorySeparatorChar))
{
return false;
}
var newSubPathTrimmed = newSubPath.AsSpan().TrimEnd(newDirectorySeparatorChar);
// Ensure that the path with the old subpath removed starts with a leading dir separator
int idx = oldSubPathEndsWithSeparator ? subPath.Length - 1 : subPath.Length;
newPath = string.Concat(newSubPathTrimmed, path.AsSpan(idx));
return true;
}
}
}
|
