| | | 1 | | // ----------------------------------------------------------------------- |
| | | 2 | | // <copyright file="TextRandomGenerator.cs" company="Stéphane ANDRE"> |
| | | 3 | | // Copyright (c) Stéphane ANDRE. All rights reserved. |
| | | 4 | | // </copyright> |
| | | 5 | | // ----------------------------------------------------------------------- |
| | | 6 | | |
| | | 7 | | using System; |
| | | 8 | | using System.Collections.Generic; |
| | | 9 | | using System.Text; |
| | | 10 | | using MyNet.Generator; |
| | | 11 | | using MyNet.Generator.Facade; |
| | | 12 | | using MyNet.Primitives.Helpers; |
| | | 13 | | |
| | | 14 | | namespace MyNet.Text.Randomize; |
| | | 15 | | |
| | | 16 | | /// <summary> |
| | | 17 | | /// Implements a random text generator that can replace specific symbols in a format string with random characters based |
| | | 18 | | /// </summary> |
| | | 19 | | /// <param name="random">The random generator used to generate random values.</param> |
| | | 20 | | public sealed class TextRandomGenerator(IRandomGenerator random) : ITextRandomGenerator |
| | | 21 | | { |
| | | 22 | | /// <summary> |
| | | 23 | | /// Gets the current instance of the <see cref="TextRandomGenerator"/> using the default random generator. |
| | | 24 | | /// </summary> |
| | 2 | 25 | | public static TextRandomGenerator Current { get; } = new(RandomGenerator.Current); |
| | | 26 | | |
| | | 27 | | /// <inheritdoc/> |
| | | 28 | | public string Randomize(string pattern) |
| | | 29 | | { |
| | 11 | 30 | | ArgumentNullException.ThrowIfNull(pattern); |
| | | 31 | | |
| | 11 | 32 | | var builder = new StringBuilder(pattern.Length); |
| | | 33 | | |
| | 54 | 34 | | for (var i = 0; i < pattern.Length; i++) |
| | | 35 | | { |
| | 19 | 36 | | var c = pattern[i]; |
| | | 37 | | |
| | 19 | 38 | | switch (c) |
| | | 39 | | { |
| | 3 | 40 | | case '\\' when i + 1 >= pattern.Length: |
| | 0 | 41 | | throw new FormatException("Invalid escape sequence."); |
| | | 42 | | |
| | | 43 | | case '\\': |
| | 3 | 44 | | builder.Append(pattern[++i]); |
| | 3 | 45 | | continue; |
| | | 46 | | |
| | | 47 | | case '{': |
| | | 48 | | { |
| | 3 | 49 | | var end = pattern.IndexOf('}', i); |
| | | 50 | | |
| | 3 | 51 | | if (end < 0) |
| | 3 | 52 | | throw new FormatException("Missing closing brace."); |
| | | 53 | | |
| | 0 | 54 | | ParseComplexToken(pattern.AsSpan(i + 1, end - i - 1), builder); |
| | | 55 | | |
| | 0 | 56 | | i = end; |
| | 0 | 57 | | continue; |
| | | 58 | | } |
| | | 59 | | |
| | | 60 | | default: |
| | 13 | 61 | | builder.Append(GenerateToken(c)); |
| | | 62 | | break; |
| | | 63 | | } |
| | | 64 | | } |
| | | 65 | | |
| | 8 | 66 | | return builder.ToString(); |
| | | 67 | | } |
| | | 68 | | |
| | | 69 | | /// <summary> |
| | | 70 | | /// Expands a character set defined in a token, supporting both individual characters and ranges (e.g., A-Z). The in |
| | | 71 | | /// </summary> |
| | | 72 | | /// <param name="pattern">The character set pattern to expand.</param> |
| | | 73 | | /// <returns>An array of characters representing the expanded character set.</returns> |
| | | 74 | | /// <exception cref="FormatException">Thrown when the character set pattern is invalid.</exception> |
| | | 75 | | private static char[] ExpandCharacterSet(ReadOnlySpan<char> pattern) |
| | | 76 | | { |
| | 0 | 77 | | var chars = new List<char>(); |
| | | 78 | | |
| | 0 | 79 | | for (var i = 0; i < pattern.Length; i++) |
| | | 80 | | { |
| | 0 | 81 | | if (i + 2 < pattern.Length && |
| | 0 | 82 | | pattern[i + 1] == '-') |
| | | 83 | | { |
| | 0 | 84 | | var start = pattern[i]; |
| | 0 | 85 | | var end = pattern[i + 2]; |
| | | 86 | | |
| | 0 | 87 | | if (start > end) |
| | 0 | 88 | | throw new FormatException("Invalid character range."); |
| | | 89 | | |
| | 0 | 90 | | for (var c = start; c <= end; c++) |
| | 0 | 91 | | chars.Add(c); |
| | | 92 | | |
| | 0 | 93 | | i += 2; |
| | 0 | 94 | | continue; |
| | | 95 | | } |
| | | 96 | | |
| | 0 | 97 | | chars.Add(pattern[i]); |
| | | 98 | | } |
| | | 99 | | |
| | 0 | 100 | | return [.. chars]; |
| | | 101 | | } |
| | | 102 | | |
| | | 103 | | /// <summary> |
| | | 104 | | /// Parses a complex token enclosed in braces and appends the generated characters to the provided StringBuilder. Th |
| | | 105 | | /// </summary> |
| | | 106 | | /// <param name="token">The complex token to parse.</param> |
| | | 107 | | /// <param name="builder">The StringBuilder to append the generated characters to.</param> |
| | | 108 | | /// <exception cref="FormatException">Thrown when the token format is invalid.</exception> |
| | | 109 | | private void ParseComplexToken(ReadOnlySpan<char> token, StringBuilder builder) |
| | | 110 | | { |
| | 0 | 111 | | if (token.IsEmpty) |
| | 0 | 112 | | throw new FormatException("Empty token."); |
| | | 113 | | |
| | | 114 | | // {#5} |
| | 0 | 115 | | if (token.Length >= 2 && char.IsDigit(token[^1])) |
| | | 116 | | { |
| | 0 | 117 | | var countStart = token.Length - 1; |
| | | 118 | | |
| | 0 | 119 | | while (countStart > 0 && char.IsDigit(token[countStart - 1])) |
| | 0 | 120 | | countStart--; |
| | | 121 | | |
| | 0 | 122 | | var countSpan = token[countStart..]; |
| | | 123 | | |
| | 0 | 124 | | if (!int.TryParse(countSpan, out var count)) |
| | 0 | 125 | | throw new FormatException("Invalid repetition count."); |
| | | 126 | | |
| | 0 | 127 | | var valueSpan = token[..countStart]; |
| | | 128 | | |
| | 0 | 129 | | switch (valueSpan.Length) |
| | | 130 | | { |
| | | 131 | | // {[ABC]5} |
| | 0 | 132 | | case >= 3 when |
| | 0 | 133 | | valueSpan[0] == '[' && |
| | 0 | 134 | | valueSpan[^1] == ']': |
| | | 135 | | { |
| | 0 | 136 | | var charset = ExpandCharacterSet(valueSpan[1..^1]); |
| | | 137 | | |
| | 0 | 138 | | for (var i = 0; i < count; i++) |
| | 0 | 139 | | builder.Append(charset[random.Int(0, charset.Length)]); |
| | | 140 | | |
| | 0 | 141 | | return; |
| | | 142 | | } |
| | | 143 | | |
| | | 144 | | // {#5} |
| | | 145 | | case 1: |
| | | 146 | | { |
| | 0 | 147 | | for (var i = 0; i < count; i++) |
| | 0 | 148 | | builder.Append(GenerateToken(valueSpan[0])); |
| | | 149 | | |
| | 0 | 150 | | return; |
| | | 151 | | } |
| | | 152 | | |
| | | 153 | | default: |
| | 0 | 154 | | throw new FormatException($"Invalid token '{token}'."); |
| | | 155 | | } |
| | | 156 | | } |
| | | 157 | | |
| | | 158 | | // {ABC} |
| | 0 | 159 | | foreach (var c in token) |
| | 0 | 160 | | builder.Append(c); |
| | 0 | 161 | | } |
| | | 162 | | |
| | | 163 | | /// <summary> |
| | | 164 | | /// Generates a random character based on the provided token. The token determines the type of character to generate |
| | | 165 | | /// - '#' generates a random digit (0-9). |
| | | 166 | | /// - '?' generates a random uppercase letter (A-Z). |
| | | 167 | | /// - 'a' generates a random lowercase letter (a-z). |
| | | 168 | | /// - '*' generates a random alphanumeric character (0-9, A-Z). |
| | | 169 | | /// - '&' generates a random hexadecimal character (0-9, A-F). |
| | | 170 | | /// - '!' generates a random ASCII character (from 33 to 126). |
| | | 171 | | /// </summary> |
| | | 172 | | /// <param name="token">The token representing the type of character to generate.</param> |
| | | 173 | | /// <returns>A randomly generated character based on the token.</returns> |
| | | 174 | | private char GenerateToken(char token) |
| | 13 | 175 | | => token switch |
| | 13 | 176 | | { |
| | 3 | 177 | | '#' => (char)('0' + random.Int(0, 10)), |
| | 0 | 178 | | '?' => (char)('A' + random.Int(0, 26)), |
| | 0 | 179 | | 'a' => (char)('a' + random.Int(0, 26)), |
| | 0 | 180 | | '*' => random.Bool() ? (char)('0' + random.Int(0, 10)) : (char)('A' + random.Int(0, 26)), |
| | 0 | 181 | | '&' => CharHelper.HexDigits[random.Int(0, 16)], |
| | 0 | 182 | | '!' => (char)random.Int(33, 127), |
| | 10 | 183 | | _ => token |
| | 13 | 184 | | }; |
| | | 185 | | } |
| | | 186 | | |