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using System.Text;
namespace IOL.Helpers
{
public static class Slug
{
public static string Generate(bool toLower, params string[] values) {
return Create(string.Join("-", values), toLower);
}
/// <summary>
/// Creates a slug.
/// References:
/// http://www.unicode.org/reports/tr15/tr15-34.html
/// https://meta.stackexchange.com/questions/7435/non-us-ascii-characters-dropped-from-full-profile-url/7696#7696
/// https://stackoverflow.com/questions/25259/how-do-you-include-a-webpage-title-as-part-of-a-webpage-url/25486#25486
/// https://stackoverflow.com/questions/3769457/how-can-i-remove-accents-on-a-string
/// </summary>
/// <param name="value"></param>
/// <param name="toLower"></param>
/// <returns>Slugified string</returns>
public static string Create(string value, bool toLower) {
if (string.IsNullOrWhiteSpace(value))
return value;
var normalised = value.Normalize(NormalizationForm.FormKD);
const int MAXLEN = 80;
var len = normalised.Length;
var prevDash = false;
var sb = new StringBuilder(len);
for (var i = 0; i < len; i++) {
var c = normalised[i];
switch (c) {
case >= 'a' and <= 'z':
case >= '0' and <= '9': {
if (prevDash) {
sb.Append('-');
prevDash = false;
}
sb.Append(c);
break;
}
case >= 'A' and <= 'Z': {
if (prevDash) {
sb.Append('-');
prevDash = false;
}
// Tricky way to convert to lowercase
if (toLower)
sb.Append((char) (c | 32));
else
sb.Append(c);
break;
}
case ' ':
case ',':
case '.':
case '/':
case '\\':
case '-':
case '_':
case '=': {
if (!prevDash && sb.Length > 0) {
prevDash = true;
}
break;
}
default: {
var swap = ConvertEdgeCases(c, toLower);
if (swap != null) {
if (prevDash) {
sb.Append('-');
prevDash = false;
}
sb.Append(swap);
}
break;
}
}
if (sb.Length == MAXLEN)
break;
}
return sb.ToString();
}
private static string ConvertEdgeCases(char c, bool toLower) => c switch {
'ı' => "i",
'ł' => "l",
'Ł' => toLower ? "l" : "L",
'đ' => "d",
'ß' => "ss",
'ø' => "o",
'å' => "aa",
'æ' => "ae",
'Þ' => "th",
_ => null
};
}
}
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