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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule containsNode
* @flow
*/
const isTextNode = require('./isTextNode');
/*eslint-disable no-bitwise */
/**
* Checks if a given DOM node contains or is another DOM node.
*/
function containsNode(outerNode: ?Node, innerNode: ?Node): boolean {
if (!outerNode || !innerNode) {
return false;
} else if (outerNode === innerNode) {
return true;
} else if (isTextNode(outerNode)) {
return false;
} else if (isTextNode(innerNode)) {
return containsNode(outerNode, innerNode.parentNode);
} else if ('contains' in outerNode) {
return outerNode.contains(innerNode);
} else if (outerNode.compareDocumentPosition) {
return !!(outerNode.compareDocumentPosition(innerNode) & 16);
} else {
return false;
}
}
module.exports = containsNode;
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