142 lines
4.7 KiB
C#
142 lines
4.7 KiB
C#
using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace NadekoBot.Extensions
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{
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public static class StringExtensions
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{
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public static string StripHTML(this string input)
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{
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return Regex.Replace(input, "<.*?>", String.Empty);
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}
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/// <summary>
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/// Easy use of fast, efficient case-insensitive Contains check with StringComparison Member Types
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/// CurrentCulture, CurrentCultureIgnoreCase, InvariantCulture, InvariantCultureIgnoreCase, Ordinal, OrdinalIgnoreCase
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/// </summary>
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public static bool ContainsNoCase(this string str, string contains, StringComparison compare)
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{
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return str.IndexOf(contains, compare) >= 0;
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}
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public static string TrimTo(this string str, int maxLength, bool hideDots = false)
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{
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if (maxLength < 0)
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throw new ArgumentOutOfRangeException(nameof(maxLength), $"Argument {nameof(maxLength)} can't be negative.");
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if (maxLength == 0)
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return string.Empty;
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if (maxLength <= 3)
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return string.Concat(str.Select(c => '.'));
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if (str.Length < maxLength)
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return str;
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return string.Concat(str.Take(maxLength - 3)) + (hideDots ? "" : "...");
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}
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public static string ToTitleCase(this string str)
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{
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var tokens = str.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
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for (var i = 0; i < tokens.Length; i++)
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{
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var token = tokens[i];
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tokens[i] = token.Substring(0, 1).ToUpper() + token.Substring(1);
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}
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return string.Join(" ", tokens);
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}
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/// <summary>
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/// Removes trailing S or ES (if specified) on the given string if the num is 1
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/// </summary>
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/// <param name="str"></param>
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/// <param name="num"></param>
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/// <param name="es"></param>
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/// <returns>String with the correct singular/plural form</returns>
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public static string SnPl(this string str, int? num, bool es = false)
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{
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if (str == null)
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throw new ArgumentNullException(nameof(str));
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if (num == null)
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throw new ArgumentNullException(nameof(num));
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return num == 1 ? str.Remove(str.Length - 1, es ? 2 : 1) : str;
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}
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//http://www.dotnetperls.com/levenshtein
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public static int LevenshteinDistance(this string s, string t)
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{
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var n = s.Length;
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var m = t.Length;
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var d = new int[n + 1, m + 1];
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// Step 1
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if (n == 0)
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{
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return m;
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}
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if (m == 0)
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{
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return n;
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}
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// Step 2
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for (var i = 0; i <= n; d[i, 0] = i++)
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{
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}
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for (var j = 0; j <= m; d[0, j] = j++)
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{
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}
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// Step 3
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for (var i = 1; i <= n; i++)
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{
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//Step 4
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for (var j = 1; j <= m; j++)
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{
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// Step 5
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var cost = (t[j - 1] == s[i - 1]) ? 0 : 1;
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// Step 6
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d[i, j] = Math.Min(
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Math.Min(d[i - 1, j] + 1, d[i, j - 1] + 1),
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d[i - 1, j - 1] + cost);
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}
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}
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// Step 7
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return d[n, m];
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}
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public static async Task<Stream> ToStream(this string str)
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{
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var ms = new MemoryStream();
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var sw = new StreamWriter(ms);
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await sw.WriteAsync(str);
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await sw.FlushAsync();
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ms.Position = 0;
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return ms;
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}
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private static readonly Regex filterRegex = new Regex(@"(?:discord(?:\.gg|.me|app\.com\/invite)\/(?<id>([\w]{16}|(?:[\w]+-?){3})))", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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public static bool IsDiscordInvite(this string str)
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=> filterRegex.IsMatch(str);
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public static string Unmention(this string str) => str.Replace("@", "ම");
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public static string SanitizeMentions(this string str) =>
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str.Replace("@everyone", "@everyοne").Replace("@here", "@һere");
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public static string ToBase64(this string plainText)
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{
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var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
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return Convert.ToBase64String(plainTextBytes);
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}
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public static string GetInitials(this string txt, string glue = "") =>
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string.Join(glue, txt.Split(' ').Select(x => x.FirstOrDefault()));
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}
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}
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