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- /**
- * @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 utils/dom/indexof
- */
- /**
- * Returns index of the node in the parent element.
- *
- * @param {Node} node Node which index is tested.
- * @returns {Number} Index of the node in the parent element. Returns 0 if node has no parent.
- */
- export default function indexOf( node ) {
- let index = 0;
- while ( node.previousSibling ) {
- node = node.previousSibling;
- index++;
- }
- return index;
- }
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