react app

react-app/node_modules/react/lib/containsNode.js

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+/**
+ * Copyright 2013-2015, 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
+ * @typechecks
+ */
+
+var isTextNode = require("./isTextNode");
+
+/*jslint bitwise:true */
+
+/**
+ * Checks if a given DOM node contains or is another DOM node.
+ *
+ * @param {?DOMNode} outerNode Outer DOM node.
+ * @param {?DOMNode} innerNode Inner DOM node.
+ * @return {boolean} True if `outerNode` contains or is `innerNode`.
+ */
+function containsNode(outerNode, innerNode) {
+  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 (outerNode.contains) {
+    return outerNode.contains(innerNode);
+  } else if (outerNode.compareDocumentPosition) {
+    return !!(outerNode.compareDocumentPosition(innerNode) & 16);
+  } else {
+    return false;
+  }
+}
+
+module.exports = containsNode;