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37 lines
923 B
37 lines
923 B
'use strict'; |
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/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* |
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*/ |
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var isTextNode = require('./isTextNode'); |
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/*eslint-disable no-bitwise */ |
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/** |
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* Checks if a given DOM node contains or is another DOM node. |
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*/ |
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function containsNode(outerNode, innerNode) { |
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if (!outerNode || !innerNode) { |
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return false; |
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} else if (outerNode === innerNode) { |
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return true; |
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} else if (isTextNode(outerNode)) { |
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return false; |
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} else if (isTextNode(innerNode)) { |
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return containsNode(outerNode, innerNode.parentNode); |
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} else if ('contains' in outerNode) { |
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return outerNode.contains(innerNode); |
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} else if (outerNode.compareDocumentPosition) { |
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return !!(outerNode.compareDocumentPosition(innerNode) & 16); |
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} else { |
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return false; |
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} |
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} |
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module.exports = containsNode; |