93 lines
3.1 KiB
C#
93 lines
3.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace PluralKit.Core
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{
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public static class StringUtils
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{
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public static string GenerateToken()
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{
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var buf = new byte[48]; // Results in a 64-byte Base64 string (no padding)
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new RNGCryptoServiceProvider().GetBytes(buf);
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return Convert.ToBase64String(buf);
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}
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public static bool IsLongerThan(this string str, int length)
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{
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if (str != null) return str.Length > length;
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return false;
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}
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public static string ExtractCountryFlag(string flag)
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{
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if (flag.Length != 4) return null;
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try
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{
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var cp1 = char.ConvertToUtf32(flag, 0);
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var cp2 = char.ConvertToUtf32(flag, 2);
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if (cp1 < 0x1F1E6 || cp1 > 0x1F1FF) return null;
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if (cp2 < 0x1F1E6 || cp2 > 0x1F1FF) return null;
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return $"{(char) (cp1 - 0x1F1E6 + 'A')}{(char) (cp2 - 0x1F1E6 + 'A')}";
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}
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catch (ArgumentException)
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{
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return null;
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}
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}
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public static string NullIfEmpty(this string input)
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{
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if (input == null) return null;
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if (input.Trim().Length == 0) return null;
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return input;
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}
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public static bool EmptyOrNull(this string input)
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{
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if (input == null) return true;
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if (input.Trim().Length == 0) return true;
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return false;
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}
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public static string NormalizeLineEndSpacing(this string input)
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{
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// iOS has a weird issue on embeds rendering newlines when there are spaces *just before* it
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// so we remove 'em all :)
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return Regex.Replace(input, " *\n", "\n");
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}
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public static IReadOnlyList<string> JoinPages(IEnumerable<string> input, int characterLimit) =>
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JoinPages(input, _ => characterLimit);
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public static IReadOnlyList<string> JoinPages(IEnumerable<string> input, Func<int, int> characterLimitByPage)
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{
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var output = new List<string>();
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var buf = new StringBuilder();
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foreach (var s in input)
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{
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var limit = characterLimitByPage.Invoke(output.Count);
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// Would adding this string put us over the limit?
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// (note: don't roll over if the buffer's already empty; this means an individual section is above the character limit. todo: truncate, then?)
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if (buf.Length > 0 && buf.Length + s.Length > limit)
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{
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// If so, "roll over" (before adding the string to the buffer)
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output.Add(buf.ToString());
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buf.Clear();
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}
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buf.Append(s);
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}
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// We most likely have something left over, so add that in too
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if (buf.Length > 0)
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output.Add(buf.ToString());
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return output;
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}
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}
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} |