@ckeditor/ckeditor5-paste-from-office/src/filters/removemsattributes.js

Paste from Office feature for CKEditor 5.

/**
 * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
/**
 * @module paste-from-office/filters/removemsattributes
 */
import { UpcastWriter } from 'ckeditor5/src/engine.js';
/**
 * Cleanup MS attributes like styles, attributes and elements.
 *
 * @param documentFragment element `data.content` obtained from clipboard.
 */
export default function removeMSAttributes(documentFragment) {
    const elementsToUnwrap = [];
    const writer = new UpcastWriter(documentFragment.document);
    for (const { item } of writer.createRangeIn(documentFragment)) {
        if (!item.is('element')) {
            continue;
        }
        for (const className of item.getClassNames()) {
            if (/\bmso/gi.exec(className)) {
                writer.removeClass(className, item);
            }
        }
        for (const styleName of item.getStyleNames()) {
            if (/\bmso/gi.exec(styleName)) {
                writer.removeStyle(styleName, item);
            }
        }
        if (item.is('element', 'w:sdt') ||
            item.is('element', 'w:sdtpr') && item.isEmpty ||
            item.is('element', 'o:p') && item.isEmpty) {
            elementsToUnwrap.push(item);
        }
    }
    for (const item of elementsToUnwrap) {
        const itemParent = item.parent;
        const childIndex = itemParent.getChildIndex(item);
        writer.insertChild(childIndex, item.getChildren(), itemParent);
        writer.remove(item);
    }
}