1 files changed, 68 insertions, 0 deletions
diff --git a/alarm/node_modules/jsdom/lib/jsdom/living/helpers/node.js b/alarm/node_modules/jsdom/lib/jsdom/living/helpers/node.js
new file mode 100644
index 0000000..40e12bc
--- /dev/null
+++ b/alarm/node_modules/jsdom/lib/jsdom/living/helpers/node.js
@@ -0,0 +1,68 @@
+"use strict";
+
+const NODE_TYPE = require("../node-type");
+const { domSymbolTree } = require("./internal-constants");
+
+// https://dom.spec.whatwg.org/#concept-node-length
+function nodeLength(node) {
+  switch (node.nodeType) {
+    case NODE_TYPE.DOCUMENT_TYPE_NODE:
+      return 0;
+
+    case NODE_TYPE.TEXT_NODE:
+    case NODE_TYPE.PROCESSING_INSTRUCTION_NODE:
+    case NODE_TYPE.COMMENT_NODE:
+      return node.data.length;
+
+    default:
+      return domSymbolTree.childrenCount(node);
+  }
+}
+
+// https://dom.spec.whatwg.org/#concept-tree-root
+function nodeRoot(node) {
+  while (domSymbolTree.parent(node)) {
+    node = domSymbolTree.parent(node);
+  }
+
+  return node;
+}
+
+// https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor
+function isInclusiveAncestor(ancestorNode, node) {
+  while (node) {
+    if (ancestorNode === node) {
+      return true;
+    }
+
+    node = domSymbolTree.parent(node);
+  }
+
+  return false;
+}
+
+// https://dom.spec.whatwg.org/#concept-tree-following
+function isFollowing(nodeA, nodeB) {
+  if (nodeA === nodeB) {
+    return false;
+  }
+
+  let current = nodeB;
+  while (current) {
+    if (current === nodeA) {
+      return true;
+    }
+
+    current = domSymbolTree.following(current);
+  }
+
+  return false;
+}
+
+module.exports = {
+  nodeLength,
+  nodeRoot,
+
+  isInclusiveAncestor,
+  isFollowing
+};