You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
4.2 KiB
116 lines
4.2 KiB
/*
|
|
MIT License
|
|
|
|
Copyright (c) 2019 Gérald Barré
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
*/
|
|
|
|
// TODO: remove when analyzer is fixed: https://github.com/dotnet/roslyn-analyzers/issues/5158
|
|
#pragma warning disable CA1034 // Nested types should not be visible
|
|
|
|
using System;
|
|
using System.Diagnostics.Contracts;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace Jellyfin.Extensions
|
|
{
|
|
/// <summary>
|
|
/// Extension class for splitting lines without unnecessary allocations.
|
|
/// </summary>
|
|
public static class SplitStringExtensions
|
|
{
|
|
/// <summary>
|
|
/// Creates a new string split enumerator.
|
|
/// </summary>
|
|
/// <param name="str">The string to split.</param>
|
|
/// <param name="separator">The separator to split on.</param>
|
|
/// <returns>The enumerator struct.</returns>
|
|
[Pure]
|
|
public static Enumerator SpanSplit(this string str, char separator) => new(str.AsSpan(), separator);
|
|
|
|
/// <summary>
|
|
/// Creates a new span split enumerator.
|
|
/// </summary>
|
|
/// <param name="str">The span to split.</param>
|
|
/// <param name="separator">The separator to split on.</param>
|
|
/// <returns>The enumerator struct.</returns>
|
|
[Pure]
|
|
public static Enumerator Split(this ReadOnlySpan<char> str, char separator) => new(str, separator);
|
|
|
|
/// <summary>
|
|
/// Provides an enumerator for the substrings seperated by the separator.
|
|
/// </summary>
|
|
[StructLayout(LayoutKind.Auto)]
|
|
public ref struct Enumerator
|
|
{
|
|
private readonly char _separator;
|
|
private ReadOnlySpan<char> _str;
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="Enumerator"/> struct.
|
|
/// </summary>
|
|
/// <param name="str">The span to split.</param>
|
|
/// <param name="separator">The separator to split on.</param>
|
|
public Enumerator(ReadOnlySpan<char> str, char separator)
|
|
{
|
|
_str = str;
|
|
_separator = separator;
|
|
Current = default;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a reference to the item at the current position of the enumerator.
|
|
/// </summary>
|
|
public ReadOnlySpan<char> Current { get; private set; }
|
|
|
|
/// <summary>
|
|
/// Returns <c>this</c>.
|
|
/// </summary>
|
|
/// <returns><c>this</c>.</returns>
|
|
public readonly Enumerator GetEnumerator() => this;
|
|
|
|
/// <summary>
|
|
/// Advances the enumerator to the next item.
|
|
/// </summary>
|
|
/// <returns><c>true</c> if there is a next element; otherwise <c>false</c>.</returns>
|
|
public bool MoveNext()
|
|
{
|
|
if (_str.Length == 0)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
var span = _str;
|
|
var index = span.IndexOf(_separator);
|
|
if (index == -1)
|
|
{
|
|
_str = ReadOnlySpan<char>.Empty;
|
|
Current = span;
|
|
return true;
|
|
}
|
|
|
|
Current = span.Slice(0, index);
|
|
_str = span[(index + 1)..];
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|