RegexBot/Common/Utilities.cs
Noi 1149f2800d Reorganized project
Moved modules into the assembly itself to simplify development of
further features and reduce complexity in building this project.

Additionally, many small adjustments were made, including:
- Add documentation to most public methods that had it missing
- Minor style updates
- Updated readme to reflect near-completion of this rewrite
- Remove any last remaining references to old project name Kerobot
- Update dependencies
2022-07-20 18:55:08 -07:00

67 lines
3.1 KiB
C#

using Discord;
using System.Diagnostics.CodeAnalysis;
using System.Text.RegularExpressions;
namespace RegexBot.Common;
/// <summary>
/// Miscellaneous utility methods useful for the bot and modules.
/// </summary>
public static class Utilities {
/// <summary>
/// Gets a compiled regex that matches a channel tag and pulls its snowflake value.
/// </summary>
public static Regex ChannelMention { get; } = new(@"<#(?<snowflake>\d+)>", RegexOptions.Compiled);
/// <summary>
/// Gets a compiled regex that matches a custom emoji and pulls its name and ID.
/// </summary>
public static Regex CustomEmoji { get; } = new(@"<:(?<name>[A-Za-z0-9_]{2,}):(?<ID>\d+)>", RegexOptions.Compiled);
/// <summary>
/// Gets a compiled regex that matches a fully formed Discord handle, extracting the name and discriminator.
/// </summary>
public static Regex DiscriminatorSearch { get; } = new(@"(.+)#(\d{4}(?!\d))", RegexOptions.Compiled);
/// <summary>
/// Gets a compiled regex that matches a user tag and pulls its snowflake value.
/// </summary>
public static Regex UserMention { get; } = new(@"<@!?(?<snowflake>\d+)>", RegexOptions.Compiled);
/// <summary>
/// Performs common checks on the specified message to see if it fits all the criteria of a
/// typical, ordinary message sent by an ordinary guild user.
/// </summary>
public static bool IsValidUserMessage(SocketMessage msg, [NotNullWhen(true)] out SocketTextChannel? channel) {
channel = default;
if (msg.Channel is not SocketTextChannel ch) return false;
if (msg.Author.IsBot || msg.Author.IsWebhook) return false;
if (((IMessage)msg).Type != MessageType.Default) return false;
if (msg is SocketSystemMessage) return false;
channel = ch;
return true;
}
/// <summary>
/// Given a JToken, gets all string-based values out of it if the token may be a string
/// or an array of strings.
/// </summary>
/// <param name="token">The JSON token to analyze and retrieve strings from.</param>
/// <exception cref="ArgumentException">Thrown if the given token is not a string or array containing all strings.</exception>
/// <exception cref="ArgumentNullException">Thrown if the given token is null.</exception>
public static List<string> LoadStringOrStringArray(JToken? token) {
const string ExNotString = "This token contains a non-string element.";
if (token == null) throw new ArgumentNullException(nameof(token), "The provided token is null.");
var results = new List<string>();
if (token.Type == JTokenType.String) {
results.Add(token.Value<string>()!);
} else if (token.Type == JTokenType.Array) {
foreach (var entry in token.Values()) {
if (entry.Type != JTokenType.String) throw new ArgumentException(ExNotString, nameof(token));
results.Add(entry.Value<string>()!);
}
} else {
throw new ArgumentException(ExNotString, nameof(token));
}
return results;
}
}