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@ -1,112 +0,0 @@
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using System.Text;
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namespace Connected.Services;
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internal static class UrlGenerator
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{
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private const string ValidCharacters = "abcdefghijklmnopqrstuvzxyw-";
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private const string MinusReplacements = "_ .\t\r\n";
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static UrlGenerator()
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{
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Replacements = new(StringComparer.OrdinalIgnoreCase)
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{
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{"č", "c"},
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{"š", "s"},
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{"ž", "z"},
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{"đ", "d"},
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{"ć", "c"}
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};
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}
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private static Dictionary<string, string> Replacements { get; }
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public static string Generate(string text)
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{
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if (string.IsNullOrEmpty(text))
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throw new NullReferenceException(nameof(text));
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var result = new StringBuilder();
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/*
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* Analyze each character.
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*/
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foreach (var s in text.Trim())
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{
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/*
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* If it's in a ValidCharacters collection that's fine, we just copy it
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* into the result.
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*/
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if (ValidCharacters.Contains(s, StringComparison.OrdinalIgnoreCase))
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{
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result.Append(s);
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continue;
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}
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/*
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* Look if it's in the MinusReplacements collection which means we'll
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* replace the character with the minus sign.
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*/
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if (MinusReplacements.Contains(s, StringComparison.OrdinalIgnoreCase))
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{
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result.Append('-');
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continue;
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}
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/*
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* Last chance for the character to be included in the result is to
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* resolve the hardcoded character replacements.
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*/
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if (Replacements.TryGetValue(s.ToString(), out var replacement))
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result.Append(replacement);
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}
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/*
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* It's possible that no characters are included in the result. If that's
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* the case we are going to include an a character just for the sake of
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* being a valid string.
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*/
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if (result.Length == 0)
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result.Append('a');
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/*
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* Remove any redundant minus characters and we are done.
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*/
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var sb = new StringBuilder();
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var active = false;
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for (var i = 0; i < result.Length; i++)
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{
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if (result[i] == '-')
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{
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if (active)
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continue;
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active = true;
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sb.Append(result[i]);
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}
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else
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{
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active = false;
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sb.Append(result[i]);
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}
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}
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/*
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* Remove trailing minus if exists.
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*/
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return sb.ToString().Trim().Trim('-').ToLowerInvariant();
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}
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public static string Generate(string text, IEnumerable<string> existing)
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{
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var prepared = Generate(text);
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if (!existing.Any())
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return prepared;
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var idx = 0;
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while (true)
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{
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var key = $"{prepared}-{idx}";
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if (!existing.Contains(key, StringComparer.OrdinalIgnoreCase))
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return key;
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idx++;
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}
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}
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}
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