using System;
using System.Text.RegularExpressions;
using ICU4N.Text;
namespace Jellyfin.Extensions
{
///
/// Provides extensions methods for .
///
public static partial class StringExtensions
{
private static readonly Lazy _transliterator = new(() => Transliterator.GetInstance(
"Any-Latin; Latin-Ascii; Lower; NFD; [:Nonspacing Mark:] Remove; [:Punctuation:] Remove;"));
// Matches non-conforming unicode chars
// https://mnaoumov.wordpress.com/2014/06/14/stripping-invalid-characters-from-utf-16-strings/
[GeneratedRegex("([\ud800-\udbff](?![\udc00-\udfff]))|((?
/// Removes the diacritics character from the strings.
///
/// The string to act on.
/// The string without diacritics character.
public static string RemoveDiacritics(this string text)
=> Diacritics.Extensions.StringExtensions.RemoveDiacritics(
NonConformingUnicodeRegex().Replace(text, string.Empty));
///
/// Checks whether or not the specified string has diacritics in it.
///
/// The string to check.
/// True if the string has diacritics, false otherwise.
public static bool HasDiacritics(this string text)
=> Diacritics.Extensions.StringExtensions.HasDiacritics(text)
|| NonConformingUnicodeRegex().IsMatch(text);
///
/// Counts the number of occurrences of [needle] in the string.
///
/// The haystack to search in.
/// The character to search for.
/// The number of occurrences of the [needle] character.
public static int Count(this ReadOnlySpan value, char needle)
{
var count = 0;
var length = value.Length;
for (var i = 0; i < length; i++)
{
if (value[i] == needle)
{
count++;
}
}
return count;
}
///
/// Returns the part on the left of the needle.
///
/// The string to seek.
/// The needle to find.
/// The part left of the .
public static ReadOnlySpan LeftPart(this ReadOnlySpan haystack, char needle)
{
if (haystack.IsEmpty)
{
return ReadOnlySpan.Empty;
}
var pos = haystack.IndexOf(needle);
return pos == -1 ? haystack : haystack[..pos];
}
///
/// Returns the part on the right of the needle.
///
/// The string to seek.
/// The needle to find.
/// The part right of the .
public static ReadOnlySpan RightPart(this ReadOnlySpan haystack, char needle)
{
if (haystack.IsEmpty)
{
return ReadOnlySpan.Empty;
}
var pos = haystack.LastIndexOf(needle);
if (pos == -1)
{
return haystack;
}
if (pos == haystack.Length - 1)
{
return ReadOnlySpan.Empty;
}
return haystack[(pos + 1)..];
}
///
/// Returns a transliterated string which only contain ascii characters.
///
/// The string to act on.
/// The transliterated string.
public static string Transliterated(this string text)
{
return _transliterator.Value.Transliterate(text);
}
}
}