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66 lines
2.1 KiB
66 lines
2.1 KiB
using System;
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namespace Jellyfin.Extensions
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{
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/// <summary>
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/// Provides extensions methods for <see cref="string" />.
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/// </summary>
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public static class StringExtensions
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{
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/// <summary>
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/// Counts the number of occurrences of [needle] in the string.
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/// </summary>
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/// <param name="value">The haystack to search in.</param>
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/// <param name="needle">The character to search for.</param>
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/// <returns>The number of occurrences of the [needle] character.</returns>
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public static int Count(this ReadOnlySpan<char> value, char needle)
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{
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var count = 0;
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var length = value.Length;
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for (var i = 0; i < length; i++)
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{
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if (value[i] == needle)
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{
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count++;
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}
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}
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return count;
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}
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/// <summary>
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/// Returns the part on the left of the <c>needle</c>.
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/// </summary>
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/// <param name="haystack">The string to seek.</param>
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/// <param name="needle">The needle to find.</param>
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/// <returns>The part left of the <paramref name="needle" />.</returns>
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public static ReadOnlySpan<char> LeftPart(this ReadOnlySpan<char> haystack, char needle)
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{
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var pos = haystack.IndexOf(needle);
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return pos == -1 ? haystack : haystack[..pos];
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}
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/// <summary>
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/// Returns the part on the right of the <c>needle</c>.
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/// </summary>
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/// <param name="haystack">The string to seek.</param>
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/// <param name="needle">The needle to find.</param>
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/// <returns>The part right of the <paramref name="needle" />.</returns>
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public static ReadOnlySpan<char> RightPart(this ReadOnlySpan<char> haystack, char needle)
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{
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var pos = haystack.LastIndexOf(needle);
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if (pos == -1)
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{
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return haystack;
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}
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if (pos == haystack.Length - 1)
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{
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return ReadOnlySpan<char>.Empty;
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}
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return haystack[(pos + 1)..];
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}
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}
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}
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