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import { CommandInteraction, Message } from "discord.js";
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import { MissingParameterError } from "../errors.js";
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import { BooleanParameter, InputParameter, NumberParameter, ObjectParameter, StringParameter } from "../structures/Parameter.js";
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import { Command } from "../structures/Command.js";
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import { CommandMessageStructure, PhraseOccurrenceData } from "../types/Command.js";
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import { applicationState } from "../state.js";
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/**
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* @class Command manager
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*/
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export class CommandManager {
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private readonly _list: Command[] = [];
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/**
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* Prefix used as a way to trigger the bot using messages
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* @type {string}
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*/
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public readonly prefix?: string;
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/**
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* Separator used to split user input to a list of {@link InputParameter}s (applies to prefix interactions)
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* @type {string}
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*/
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public readonly parameterSeparator: string;
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/**
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* @constructor
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* @param {string} [prefix] - prefix used as a way to trigger the bot using messages
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* @param {string} parameterSeparator - used to split user input to a list of {@link InputParameter}s (applies to prefix interactions)
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*/
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constructor(prefix?: string, parameterSeparator?: string) {
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this.prefix = prefix;
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this.parameterSeparator = parameterSeparator || ",";
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}
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/**
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* Retrieves the command by name, alias or keyword
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* @param {string} phrase - command name, alias or keyword
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* @returns {Command | null} Retrieved {@link Command} object from the manager or *null*
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*/
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public get(phrase: string): Command | null {
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let command: Command | null = null;
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this._list.map((c) => {
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if (c.name == phrase) {
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command = c;
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}
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c.aliases &&
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c.aliases.map((a) => {
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if (a == phrase) {
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command = c;
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}
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});
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});
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return command;
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}
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/**
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* List of commands registered in the manager
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* @type {Array} {@link Command}
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*/
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get list() {
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return Object.freeze([...this._list]);
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}
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/**
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* Adds the given {@link Command} to the instance manager with initial processing
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* @param {Command} command - {@link Command} instance object
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* @returns {boolean} Whether this command has been added successfully
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*/
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public add(command: Command): boolean {
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try {
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if (applicationState.running) {
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throw new Error("Cannot add command while the application is running");
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}
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if (!(command instanceof Command)) {
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throw new TypeError("Inavlid argument type");
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}
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const nameOccurrence: PhraseOccurrenceData | null = this.findPhraseOccurrence(command.name);
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if (nameOccurrence) {
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throw new Error(`The name "${command.name}" has already been registered as ${nameOccurrence.type} in the "${nameOccurrence.command.name}" command.`);
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}
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command.aliases &&
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command.aliases.map((a, i, ar) => {
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const aliasOccurrence: PhraseOccurrenceData | null = this.findPhraseOccurrence(a);
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if (aliasOccurrence) {
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console.warn(
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`[⚠ WARN] The name "${a}" is already registered as ${aliasOccurrence.type} in the "${aliasOccurrence.command.name}" command. It will be removed from the "${command.name}" command.`
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);
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ar.splice(i, 1);
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}
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});
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command.parameters &&
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command.parameters.map((p) => {
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if (p.type != "string" && p.choices) {
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throw new Error('Parameter with defined choices must have a "string" type');
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}
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});
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this._list.push(command);
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return true;
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} catch (e) {
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console.error(`[❌ ERROR] ${e}`);
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return false;
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}
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}
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/**
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* Fetches {@link Command} and list of {@link InputParameter}s from the given {@link Message} object
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* @param {Message} message - {@link Message} object
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* @returns {CommandMessagesStructure | null} {@link CommandMessageStructure} or *null*
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*/
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public fetchFromMessage(message: Message): CommandMessageStructure | null {
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if (!this.prefix) return null;
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if (!message.author.bot && message.content.startsWith(this.prefix)) {
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const content = message.content.replace(this.prefix, "");
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const name = content.split(" ")[0];
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const command = this.get(name);
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if (command) {
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const argumentsText = content.replace(name, "");
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const paramsList = argumentsText.split(this.parameterSeparator).map((a) => {
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return a.replace(" ", "");
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});
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if ((paramsList[0] == "" || paramsList[0] == " ") && paramsList.length == 1) {
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paramsList.splice(0, 1);
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}
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const parameters: InputParameter[] = [];
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command.parameters.map((p, i) => {
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if (!p.optional && !paramsList[i]) {
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throw new MissingParameterError(p);
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} else if (p.optional && !paramsList[i]) {
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return;
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}
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switch (p.type) {
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case "mentionable":
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case "channel":
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case "role":
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case "user":
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parameters.push(new ObjectParameter(p, paramsList[i]));
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break;
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case "string":
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parameters.push(new StringParameter(p, paramsList[i]));
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break;
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case "boolean":
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parameters.push(new BooleanParameter(p, paramsList[i]));
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break;
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case "number":
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parameters.push(new NumberParameter(p, paramsList[i]));
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break;
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default:
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parameters.push(new InputParameter(p, paramsList[i]));
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break;
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}
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});
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return {
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command: command,
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parameters: parameters,
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};
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} else {
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return null;
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}
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} else {
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return null;
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}
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}
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/**
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* Fetches command and parameters from the given {@link CommandInteraction} object
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* @param {CommandInteraction} interaction - {@link CommandInteraction} object
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* @returns {CommandMessagesStructure | null} {@link CommandMessageStructure} or *null*
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*/
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public fetchFromInteraction(interaction: CommandInteraction): CommandMessageStructure | null {
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const cmd = this.get(interaction.commandName);
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if (cmd) {
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if (interaction.options?.data) {
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const paramsList = interaction.options.data;
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const parameters: InputParameter[] = [];
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cmd.parameters.map((p) => {
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const inputParam = paramsList.find((d) => d.name == p.name);
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if (!p.optional && !inputParam) {
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throw new MissingParameterError(p);
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} else if (p.optional && !inputParam) {
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return;
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}
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switch (p.type) {
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case "mentionable":
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case "channel":
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case "role":
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case "user":
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parameters.push(new ObjectParameter(p, inputParam?.value));
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break;
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case "string":
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parameters.push(new StringParameter(p, inputParam?.value));
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break;
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case "boolean":
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parameters.push(new BooleanParameter(p, inputParam?.value));
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break;
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case "number":
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parameters.push(new NumberParameter(p, inputParam?.value));
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break;
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default:
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parameters.push(new InputParameter(p, inputParam?.value));
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break;
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}
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});
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return {
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command: cmd,
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parameters: parameters,
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};
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}
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} else {
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return null;
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}
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return null;
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}
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private findPhraseOccurrence(phrase?: string): PhraseOccurrenceData | null {
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let returnValue: PhraseOccurrenceData | null = null;
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this._list.map((c) => {
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if (phrase == c.name) {
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returnValue = {
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command: c,
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type: "NAME",
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};
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} else if (c.aliases && c.aliases.indexOf(phrase || "") != -1) {
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returnValue = {
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command: c,
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type: "ALIAS",
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};
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}
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});
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return returnValue;
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}
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}
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