ve.TriggerListener.js
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ve.TriggerListener.js
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	/*!
	* VisualEditor UserInterface TriggerListener class.
	*
	* @copyright See AUTHORS.txt
	*/

	/**
	* Trigger listener
	*
	* @class
	*
	* @constructor
	* @param {string[]} commands Commands to listen to triggers for
	* @param {ve.ui.CommandRegistry} commandRegistry Command registry to get commands from
	*/
	ve.TriggerListener = function VeTriggerListener( commands, commandRegistry ) {
	// Properties
	this.commands = commands;
	this.commandsByTrigger = {};
	this.triggers = {};

	for ( let i = this.commands.length - 1; i >= 0; i-- ) {
	const command = this.commands[ i ];
	const triggers = ve.ui.triggerRegistry.lookup( command );
	if ( triggers ) {
	for ( let j = triggers.length - 1; j >= 0; j-- ) {
	this.commandsByTrigger[ triggers[ j ].toString() ] = commandRegistry.lookup( command );
	}
	this.triggers[ command ] = triggers;
	}
	}
	};

	/* Inheritance */

	OO.initClass( ve.TriggerListener );

	/* Methods */

	/**
	* Get list of commands.
	*
	* @return {string[]} Commands
	*/
	ve.TriggerListener.prototype.getCommands = function () {
	return this.commands;
	};

	/**
	* Get command associated with trigger string.
	*
	* @param {string} trigger
	* @return {ve.ui.Command\|undefined}
	*/
	ve.TriggerListener.prototype.getCommandByTrigger = function ( trigger ) {
	return this.commandsByTrigger[ trigger ];
	};

	/**
	* Get triggers for a specified name.
	*
	* @param {string} name Trigger name
	* @return {ve.ui.Trigger[]\|undefined}
	*/
	ve.TriggerListener.prototype.getTriggers = function ( name ) {
	return this.triggers[ name ];
	};