Function _queryNativeNodeDescendants

packages/core/src/debug/debug_node.ts:650–682

* Match all the descendants of a DOM node against a predicate. * * @param nativeNode the current native node * @param predicate the predicate to match * @param matches the list where matches are stored * @param elementsOnly whether only elements should be searched

(
  parentNode: any,
  predicate: Predicate<DebugElement> | Predicate<DebugNode>,
  matches: DebugElement[] | DebugNode[],
  elementsOnly: boolean,
)

 * @param elementsOnly whether only elements should be searched
 */
function _queryNativeNodeDescendants(
  parentNode: any,
  predicate: Predicate<DebugElement> | Predicate<DebugNode>,
  matches: DebugElement[] | DebugNode[],
  elementsOnly: boolean,
) {
  const nodes = parentNode.childNodes;
  const length = nodes.length;

  for (let i = 0; i < length; i++) {
    const node = nodes[i];
    const debugNode = getDebugNode(node);

    if (debugNode) {
      if (
        elementsOnly &&
        debugNode instanceof DebugElement &&
        predicate(debugNode) &&
        matches.indexOf(debugNode) === -1
      ) {
        matches.push(debugNode);
      } else if (
        !elementsOnly &&
        (predicate as Predicate<DebugNode>)(debugNode) &&
        (matches as DebugNode[]).indexOf(debugNode) === -1
      ) {
        (matches as DebugNode[]).push(debugNode);
      }

      _queryNativeNodeDescendants(node, predicate, matches, elementsOnly);
    }
  }
}

/**
 * Iterates through the property bindings for a given node and generates