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
|
// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Diagnostics;
using TextSpan = Microsoft.VisualStudio.Text.Span;
namespace Microsoft.VisualStudio.Text.PatternMatching.Implementation
{
internal struct ArraySlice<T>
{
private readonly T[] _array;
private int _start;
private int _length;
public int Length => _length;
public ArraySlice(T[] array) : this(array, 0, array.Length)
{
}
public ArraySlice(T[] array, TextSpan span) : this(array, span.Start, span.Length)
{
}
public ArraySlice(T[] array, int start, int length) : this()
{
_array = array;
SetStartAndLength(start, length);
}
public T this[int i]
{
get
{
Debug.Assert(i < _length);
return _array[i + _start];
}
}
private void SetStartAndLength(int start, int length)
{
if (start < 0)
{
throw new ArgumentException(nameof(start), $"{start} < {0}");
}
if (start > _array.Length)
{
throw new ArgumentException(nameof(start), $"{start} > {_array.Length}");
}
CheckLength(start, length);
_start = start;
_length = length;
}
private void CheckLength(int start, int length)
{
if (length < 0)
{
throw new ArgumentException(nameof(length), $"{length} < {0}");
}
if (start + length > _array.Length)
{
throw new ArgumentException(nameof(start), $"{start} + {length} > {_array.Length}");
}
}
public void MoveStartForward(int amount)
{
SetStartAndLength(_start + amount, _length - amount);
}
public void SetLength(int length)
{
CheckLength(_start, length);
_length = length;
}
}
}
|
