RegexBot/Common/Utilities.cs

89 lines
4.1 KiB
C#

using Discord;
using System.Diagnostics.CodeAnalysis;
using System.Text;
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;
}
/// <summary>
/// Returns a representation of this entity that can be parsed by the <seealso cref="EntityName"/> constructor.
/// </summary>
public static string AsEntityNameString(this IUser entity) => $"@{entity.Id}::{entity.Username}";
/// <summary>
/// If given string is in an EntityName format, returns a displayable representation of it based on
/// a cache query. Otherwise, returns the input string as-is.
/// </summary>
[return: NotNullIfNotNull("input")]
public static string? TryFromEntityNameString(string? input, RegexbotClient bot) {
string? result = null;
try {
var entityTry = new EntityName(input!, EntityType.User);
var issueq = bot.EcQueryUser(entityTry.Id!.Value.ToString());
if (issueq != null) result = $"<@{issueq.UserId}> - {issueq.Username}#{issueq.Discriminator} `{issueq.UserId}`";
else result = $"Unknown user with ID `{entityTry.Id!.Value}`";
} catch (Exception) { }
return result ?? input;
}
}