ckeditor/ckeditor5-basic-styles

/**
 * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @module basic-styles/italic/italicediting
 */

import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
import AttributeCommand from '../attributecommand';

const ITALIC = 'italic';

/**
 * The italic editing feature.
 *
 * It registers the `'italic'` command, the <kbd>Ctrl+I</kbd> keystroke and introduces the `italic` attribute in the model
 * which renders to the view as an `<i>` element.
 *
 * @extends module:core/plugin~Plugin
 */
export default class ItalicEditing extends Plugin {
    /**
     * @inheritDoc
     */
    static get pluginName() {
        return 'ItalicEditing';
    }

    /**
     * @inheritDoc
     */
    init() {
        const editor = this.editor;

        // Allow italic attribute on text nodes.
        editor.model.schema.extend( '$text', { allowAttributes: ITALIC } );
        editor.model.schema.setAttributeProperties( ITALIC, {
            isFormatting: true,
            copyOnEnter: true
        } );

        editor.conversion.attributeToElement( {
            model: ITALIC,
            view: 'i',
            upcastAlso: [
                'em',
                {
                    styles: {
                        'font-style': 'italic'
                    }
                }
            ]
        } );

        // Create italic command.
        editor.commands.add( ITALIC, new AttributeCommand( editor, ITALIC ) );

        // Set the Ctrl+I keystroke.
        editor.keystrokes.set( 'CTRL+I', ITALIC );
    }
}