96 lines
3.3 KiB
C#
96 lines
3.3 KiB
C#
/*
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MIT License
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Copyright (c) 2019 Gérald Barré
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#pragma warning disable CS1591
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#pragma warning disable CA1034
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using System;
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using System.Diagnostics.Contracts;
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using System.Runtime.InteropServices;
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namespace MediaBrowser.Common.Extensions
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{
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/// <summary>
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/// Extension class for splitting lines without unnecessary allocations.
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/// </summary>
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public static class SplitStringExtensions
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{
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/// <summary>
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/// Creates a new string split enumerator.
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/// </summary>
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/// <param name="str">The string to split.</param>
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/// <param name="separator">The separator to split on.</param>
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/// <returns>The enumerator struct.</returns>
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[Pure]
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public static SplitEnumerator SpanSplit(this string str, char separator) => new (str.AsSpan(), separator);
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/// <summary>
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/// Creates a new span split enumerator.
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/// </summary>
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/// <param name="str">The span to split.</param>
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/// <param name="separator">The separator to split on.</param>
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/// <returns>The enumerator struct.</returns>
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[Pure]
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public static SplitEnumerator Split(this ReadOnlySpan<char> str, char separator) => new (str, separator);
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[StructLayout(LayoutKind.Auto)]
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public ref struct SplitEnumerator
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{
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private readonly char _separator;
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private ReadOnlySpan<char> _str;
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public SplitEnumerator(ReadOnlySpan<char> str, char separator)
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{
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_str = str;
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_separator = separator;
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Current = default;
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}
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public ReadOnlySpan<char> Current { get; private set; }
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public readonly SplitEnumerator GetEnumerator() => this;
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public bool MoveNext()
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{
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if (_str.Length == 0)
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{
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return false;
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}
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var span = _str;
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var index = span.IndexOf(_separator);
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if (index == -1)
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{
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_str = ReadOnlySpan<char>.Empty;
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Current = span;
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return true;
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}
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Current = span.Slice(0, index);
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_str = span[(index + 1)..];
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return true;
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}
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}
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}
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}
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