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- /**
- * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- /**
- * @module basic-styles/subscript/subscriptediting
- */
- import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
- import AttributeCommand from '../attributecommand';
- const SUBSCRIPT = 'subscript';
- /**
- * The subscript editing feature.
- *
- * It registers the `sub` command and introduces the `sub` attribute in the model which renders to the view
- * as a `<sub>` element.
- *
- * @extends module:core/plugin~Plugin
- */
- export default class SubscriptEditing extends Plugin {
- /**
- * @inheritDoc
- */
- init() {
- const editor = this.editor;
- // Allow sub attribute on text nodes.
- editor.model.schema.extend( '$text', { allowAttributes: SUBSCRIPT } );
- editor.model.schema.setAttributeProperties( SUBSCRIPT, { isFormatting: true } );
- // Build converter from model to view for data and editing pipelines.
- editor.conversion.attributeToElement( {
- model: SUBSCRIPT,
- view: 'sub',
- upcastAlso: [
- {
- styles: {
- 'vertical-align': 'sub'
- }
- }
- ]
- } );
- // Create sub command.
- editor.commands.add( SUBSCRIPT, new AttributeCommand( editor, SUBSCRIPT ) );
- }
- }
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