Function collectQueryResults

packages/core/src/render3/queries/query.ts:422–459

* A helper function that collects (already materialized) query results from a tree of views, * starting with a provided LView.

(tView: TView, lView: LView, queryIndex: number, result: T[])

 * starting with a provided LView.
 */
function collectQueryResults<T>(tView: TView, lView: LView, queryIndex: number, result: T[]): T[] {
  const tQuery = tView.queries!.getByIndex(queryIndex);
  const tQueryMatches = tQuery.matches;
  if (tQueryMatches !== null) {
    const lViewResults = materializeViewResults<T>(tView, lView, tQuery, queryIndex);

    for (let i = 0; i < tQueryMatches.length; i += 2) {
      const tNodeIdx = tQueryMatches[i];
      if (tNodeIdx > 0) {
        result.push(lViewResults[i / 2] as T);
      } else {
        const childQueryIndex = tQueryMatches[i + 1];

        const declarationLContainer = lView[-tNodeIdx] as LContainer;
        ngDevMode && assertLContainer(declarationLContainer);

        // collect matches for views inserted in this container
        for (let i = CONTAINER_HEADER_OFFSET; i < declarationLContainer.length; i++) {
          const embeddedLView = declarationLContainer[i];
          if (embeddedLView[DECLARATION_LCONTAINER] === embeddedLView[PARENT]) {
            collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);
          }
        }

        // collect matches for views created from this declaration container and inserted into
        // different containers
        if (declarationLContainer[MOVED_VIEWS] !== null) {
          const embeddedLViews = declarationLContainer[MOVED_VIEWS]!;
          for (let i = 0; i < embeddedLViews.length; i++) {
            const embeddedLView = embeddedLViews[i];
            collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);
          }
        }
      }
    }
  }
  return result;
}

export function loadQueryInternal<T>(lView: LView, queryIndex: number): QueryList<T> {
  ngDevMode &&