blob: e00cadca2146d6cd4b6784182f574f71edd83309 (
plain)
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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
#pragma warning disable CS1591
using System;
using System.Collections.Generic;
namespace MediaBrowser.Controller.Sorting
{
public class AlphanumComparator : IComparer<string?>
{
public static int CompareValues(string? s1, string? s2)
{
if (s1 == null && s2 == null)
{
return 0;
}
else if (s1 == null)
{
return -1;
}
else if (s2 == null)
{
return 1;
}
int len1 = s1.Length;
int len2 = s2.Length;
// Early return for empty strings
if (len1 == 0 && len2 == 0)
{
return 0;
}
else if (len1 == 0)
{
return -1;
}
else if (len2 == 0)
{
return 1;
}
int pos1 = 0;
int pos2 = 0;
do
{
int start1 = pos1;
int start2 = pos2;
bool isNum1 = char.IsDigit(s1[pos1++]);
bool isNum2 = char.IsDigit(s2[pos2++]);
while (pos1 < len1 && char.IsDigit(s1[pos1]) == isNum1)
{
pos1++;
}
while (pos2 < len2 && char.IsDigit(s2[pos2]) == isNum2)
{
pos2++;
}
var span1 = s1.AsSpan(start1, pos1 - start1);
var span2 = s2.AsSpan(start2, pos2 - start2);
if (isNum1 && isNum2)
{
// Trim leading zeros so we can compare the length
// of the strings to find the largest number
span1 = span1.TrimStart('0');
span2 = span2.TrimStart('0');
var span1Len = span1.Length;
var span2Len = span2.Length;
if (span1Len < span2Len)
{
return -1;
}
else if (span1Len > span2Len)
{
return 1;
}
else if (span1Len >= 20) // Number is probably too big for a ulong
{
// Trim all the first digits that are the same
int i = 0;
while (i < span1Len && span1[i] == span2[i])
{
i++;
}
// If there are no more digits it's the same number
if (i == span1Len)
{
continue;
}
// Only need to compare the most significant digit
span1 = span1.Slice(i, 1);
span2 = span2.Slice(i, 1);
}
if (!ulong.TryParse(span1, out var num1)
|| !ulong.TryParse(span2, out var num2))
{
return 0;
}
else if (num1 < num2)
{
return -1;
}
else if (num1 > num2)
{
return 1;
}
}
else
{
int result = span1.CompareTo(span2, StringComparison.InvariantCulture);
if (result != 0)
{
return result;
}
}
#pragma warning disable SA1500 // TODO remove with StyleCop.Analyzers v1.2.0 https://github.com/DotNetAnalyzers/StyleCopAnalyzers/pull/3196
} while (pos1 < len1 && pos2 < len2);
#pragma warning restore SA1500
return len1 - len2;
}
/// <inheritdoc />
public int Compare(string? x, string? y)
{
return CompareValues(x, y);
}
}
}
|
