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#pragma warning disable CS1591
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace MediaBrowser.Controller.Extensions
{
/// <summary>
/// Class BaseExtensions.
/// </summary>
public static class StringExtensions
{
public static string RemoveDiacritics(this string text)
{
var chars = Normalize(text, NormalizationForm.FormD)
.Where(ch => CharUnicodeInfo.GetUnicodeCategory(ch) != UnicodeCategory.NonSpacingMark);
return Normalize(string.Concat(chars), NormalizationForm.FormC);
}
/// <summary>
/// Counts the number of occurrences of [needle] in the string.
/// </summary>
/// <param name="value">The haystack to search in.</param>
/// <param name="needle">The character to search for.</param>
/// <returns>The number of occurrences of the [needle] character.</returns>
public static int CountOccurrences(this ReadOnlySpan<char> value, char needle)
{
var count = 0;
var length = value.Length;
for (var i = 0; i < length; i++)
{
if (value[i] == needle)
{
count++;
}
}
return count;
}
private static string Normalize(string text, NormalizationForm form, bool stripStringOnFailure = true)
{
if (stripStringOnFailure)
{
try
{
return text.Normalize(form);
}
catch (ArgumentException)
{
// will throw if input contains invalid unicode chars
// https://mnaoumov.wordpress.com/2014/06/14/stripping-invalid-characters-from-utf-16-strings/
text = Regex.Replace(text, "([\ud800-\udbff](?![\udc00-\udfff]))|((?<![\ud800-\udbff])[\udc00-\udfff])", string.Empty);
return Normalize(text, form, false);
}
}
try
{
return text.Normalize(form);
}
catch (ArgumentException)
{
// if it still fails, return the original text
return text;
}
}
}
}
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