basic rebuild implementation

src/rebuild.ts

@@ -0,0 +1,46 @@
+import { serializedNodeWithId, NodeType } from './types';
+
+function buildNode(n: serializedNodeWithId): Node | null {
+  switch (n.type) {
+    case NodeType.Document:
+      return document.implementation.createDocument(null, '', null);
+    case NodeType.DocumentType:
+      return document.implementation.createDocumentType(
+        n.name,
+        n.publicId,
+        n.systemId,
+      );
+    case NodeType.Element:
+      const node = document.createElement(n.tagName);
+      for (const name in n.attributes) {
+        if (n.attributes.hasOwnProperty(name)) {
+          node.setAttribute(name, n.attributes[name]);
+        }
+      }
+      return node;
+    case NodeType.Text:
+      return document.createTextNode(n.textContent);
+    case NodeType.CDATA:
+      return document.createCDATASection(n.textContent);
+    case NodeType.Comment:
+      return document.createComment(n.textContent);
+    default:
+      return null;
+  }
+}
+
+function rebuild(n: serializedNodeWithId): Node | null {
+  const root = buildNode(n);
+  if (!root) {
+    return null;
+  }
+  if (n.type === NodeType.Document || n.type === NodeType.Element) {
+    for (const childN of n.childNodes) {
+      const childNode = rebuild(childN);
+      root.appendChild(childNode);
+    }
+  }
+  return root;
+}
+
+export default rebuild;