discord.js - Command Parser Class

CommandParser.js

const Discord = require('discord.js')

/**
 * Create instance of command parser
 * @param {*string}         prefix Command Prefix
 * @param {*discord.Client} bot    Bot Instance
 */
class CmdParser {
    constructor(prefix, bot) {

        this.prefix = prefix
        this.bot    = bot
        this.type   = {
            ADMIN: "ADMIN",
            GUILDADMIN: "GUILDADMIN",
            MODERATION: "MODERATION",
            FUN: "FUN",
            SETTING: "SETTING"
        }
        this.cmds   = {}
    
        /**
         * Register a command.
         * @param {*function}       cmdfunc     Command Function
         * @param {*string}         invoke      Command Invoke
         * @param {*string[]}       aliases     Command Aliases
         * @param {*string}         description Command Description
         * @param {*string}         help        Command Help and Usage
         * @param {*CmdParser.type} type        Command Type
         */
        this.register = function(cmdfunc, invoke, aliases, description, help, type) {
            this.cmds[invoke] = {
                cmdfunc:     cmdfunc,
                invoke:      invoke,
                aliases:     aliases,
                description: description,
                help:        help,
                type:        type
            }
        }
    
        /**
         * Parse a message from a message event.
         * @param {*Discord.Message} msg Message Event
         */
        this.parse = function(msg) {
            const cont   = msg.content,
                  author = msg.member,
                  guild  = msg.guild,
                  chan   = msg.channel
    
            if (author.id != this.bot.user.id && cont.startsWith(this.prefix)) {
                // Splitting args with " " but not in quotes
                // -> https://stackoverflow.com/questions/16261635/javascript-split-string-by-space-but-ignore-space-in-quotes-notice-not-to-spli#16261693
                const invoke = cont.split(' ')[0].substr(this.prefix.length),
                      args   = cont.match(/(".*?"|[^"\s]+)+(?=\s*|\s*$)/g).slice(1)

                if (invoke == "help") {
                    if (args.length == 0) {
                        var out = ""
                        for (var inv in this.cmds) {
                            var cmd = this.cmds[inv]
                            out += `\`${this.prefix}${cmd.invoke}\`  -  ${cmd.description} *(${cmd.type})*\n`
                        }
                        chan.send("", new Discord.RichEmbed().setColor(0xd2db2b).setDescription(out))
                    }
                    else {
                        if (invoke in this.cmds)
                            chan.send("", new Discord.RichEmbed().setColor(0xd2db2b).setDescription(`**USAGE:**\n${this.cmds[invoke].help}`))
                        else
                            chan.send("", new Discord.RichEmbed().setColor(0xdb3a2b).setDescription("There is no command with this invoke registered!"))
                    }
                }
                else if (invoke in this.cmds) {
                    console.log(`[COMMAND] (${author.user.username} @ ${guild.name}) '${cont}'`)
                    this.cmds[invoke].cmdfunc(msg, args)
                }
            }

            return this
        }
       
    }
}

exports.CmdParser = CmdParser