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/bold/boldediting
 */

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

const BOLD = 'bold';

/**
 * The bold editing feature.
 *
 * It registers the `'bold'` command and introduces the `bold` attribute in the model which renders to the view
 * as a `<strong>` element.
 *
 * @extends module:core/plugin~Plugin
 */
export default class BoldEditing extends Plugin {
    /**
     * @inheritDoc
     */
    static get pluginName() {
        return 'BoldEditing';
    }

    /**
     * @inheritDoc
     */
    init() {
        const editor = this.editor;
        // Allow bold attribute on text nodes.
        editor.model.schema.extend( '$text', { allowAttributes: BOLD } );
        editor.model.schema.setAttributeProperties( BOLD, {
            isFormatting: true,
            copyOnEnter: true
        } );

        // Build converter from model to view for data and editing pipelines.
        editor.conversion.attributeToElement( {
            model: BOLD,
            view: 'strong',
            upcastAlso: [
                'b',
                viewElement => {
                    const fontWeight = viewElement.getStyle( 'font-weight' );

                    if ( !fontWeight ) {
                        return null;
                    }

                    // Value of the `font-weight` attribute can be defined as a string or a number.
                    if ( fontWeight == 'bold' || Number( fontWeight ) >= 600 ) {
                        return {
                            name: true,
                            styles: [ 'font-weight' ]
                        };
                    }
                }
            ]
        } );

        // Create bold command.
        editor.commands.add( BOLD, new AttributeCommand( editor, BOLD ) );

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