Function locateRNodeByPath

packages/core/src/hydration/node_lookup_utils.ts:242–256

* Locates an RNode given a set of navigation instructions (which also contains * a starting point node info).

(path: string, lView: LView)

 * a starting point node info).
 */
function locateRNodeByPath(path: string, lView: LView): RNode {
  const [referenceNode, ...navigationInstructions] = decompressNodeLocation(path);
  let ref: Element;
  if (referenceNode === REFERENCE_NODE_HOST) {
    ref = lView[DECLARATION_COMPONENT_VIEW][HOST] as unknown as Element;
  } else if (referenceNode === REFERENCE_NODE_BODY) {
    ref = ɵɵresolveBody(
      lView[DECLARATION_COMPONENT_VIEW][HOST] as RElement & {ownerDocument: Document},
    ) as Element;
  } else {
    const parentElementId = Number(referenceNode);
    ref = unwrapRNode((lView as any)[parentElementId + HEADER_OFFSET]) as Element;
  }
  return navigateToNode(ref, navigationInstructions);
}

/**
 * Generate a list of DOM navigation operations to get from node `start` to node `finish`.