text: /**
   * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
   */
  
  /**
   * @module paste-from-office/pastefromoffice
   */
  
  import { Plugin } from 'ckeditor5/src/core';
  import { Clipboard } from 'ckeditor5/src/clipboard';
  
  import GoogleDocsNormalizer from './normalizers/googledocsnormalizer';
  import MSWordNormalizer from './normalizers/mswordnormalizer';
  
  /**
   * The Paste from Office plugin.
   *
   * This plugin handles content pasted from Office apps and transforms it (if necessary)
   * to a valid structure which can then be understood by the editor features.
   *
   * Transformation is made by a set of predefined {@link module:paste-from-office/normalizer~Normalizer normalizers}.
   * This plugin includes following normalizers:
   *   * {@link module:paste-from-office/normalizers/mswordnormalizer~MSWordNormalizer Microsoft Word normalizer}
   *   * {@link module:paste-from-office/normalizers/googledocsnormalizer~GoogleDocsNormalizer Google Docs normalizer}
   *
   * For more information about this feature check the {@glink api/paste-from-office package page}.
   *
   * @extends module:core/plugin~Plugin
   */
  export default class PasteFromOffice extends Plugin {
  	/**
  	 * @inheritDoc
  	 */
  	static get pluginName() {
  		return 'PasteFromOffice';
  	}
  
  	/**
  	 * @inheritDoc
  	 */
  	static get requires() {
  		return [ Clipboard ];
  	}
  
  	/**
  	 * @inheritDoc
  	 */
  	init() {
  		const editor = this.editor;
  		const viewDocument = editor.editing.view.document;
  		const normalizers = [];
  
  		normalizers.push( new MSWordNormalizer( viewDocument ) );
  		normalizers.push( new GoogleDocsNormalizer( viewDocument ) );
  
  		editor.plugins.get( 'Clipboard' ).on(
  			'inputTransformation',
  			( evt, data ) => {
  				if ( data.isTransformedWithPasteFromOffice ) {
  					return;
  				}
  
  				const htmlString = data.dataTransfer.getData( 'text/html' );
  				const activeNormalizer = normalizers.find( normalizer => normalizer.isActive( htmlString ) );
  
  				if ( activeNormalizer ) {
  					activeNormalizer.execute( data );
  
  					data.isTransformedWithPasteFromOffice = true;
  				}
  			},
  			{ priority: 'high' }
  		);
  	}
  }
  