text: /**
   * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md.
   */
  
  /**
   * @module core/editingkeystrokehandler
   */
  
  import KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';
  
  /**
   * A keystroke handler for editor editing. Its instance is available
   * in {@link module:core/editor/editor~Editor#keystrokes} so plugins
   * can register their keystrokes.
   *
   * E.g. an undo plugin would do this:
   *
   *		editor.keystrokes.set( 'Ctrl+Z', 'undo' );
   *		editor.keystrokes.set( 'Ctrl+Shift+Z', 'redo' );
   *		editor.keystrokes.set( 'Ctrl+Y', 'redo' );
   *
   * @extends utils/keystrokehandler~KeystrokeHandler
   */
  export default class EditingKeystrokeHandler extends KeystrokeHandler {
  	/**
  	 * Creates an instance of the keystroke handler.
  	 *
  	 * @param {module:core/editor/editor~Editor} editor
  	 */
  	constructor( editor ) {
  		super();
  
  		/**
  		 * The editor instance.
  		 *
  		 * @readonly
  		 * @member {module:core/editor/editor~Editor}
  		 */
  		this.editor = editor;
  	}
  
  	/**
  	 * Registers a handler for the specified keystroke.
  	 *
  	 * The handler can be specified as a command name or a callback.
  	 *
  	 * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by
  	 * the {@link module:utils/keyboard~parseKeystroke} function.
  	 * @param {Function|String} callback If a string is passed, then the keystroke will
  	 * {@link module:core/editor/editor~Editor#execute execute a command}.
  	 * If a function, then it will be called with the
  	 * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and
  	 * a `cancel()` helper to both `preventDefault()` and `stopPropagation()` of the event.
  	 * @param {Object} [options={}] Additional options.
  	 * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke
  	 * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority
  	 * are called in the order they were added.
  	 */
  	set( keystroke, callback, options = {} ) {
  		if ( typeof callback == 'string' ) {
  			const commandName = callback;
  
  			callback = ( evtData, cancel ) => {
  				this.editor.execute( commandName );
  				cancel();
  			};
  		}
  
  		super.set( keystroke, callback, options );
  	}
  }
  