Function getDeferBlocks

packages/core/src/defer/discovery.ts:30–64

(lView: LView, deferBlocks: DeferBlockDetails[])

 * @param deferBlocks defer block aggregator array
 */
export function getDeferBlocks(lView: LView, deferBlocks: DeferBlockDetails[]) {
  const tView = lView[TVIEW];
  for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
    if (isLContainer(lView[i])) {
      const lContainer = lView[i];
      // An LContainer may represent an instance of a defer block, in which case
      // we store it as a result. Otherwise, keep iterating over LContainer views and
      // look for defer blocks.
      const isLast = i === tView.bindingStartIndex - 1;
      if (!isLast) {
        const tNode = tView.data[i] as TNode;
        const tDetails = getTDeferBlockDetails(tView, tNode);
        if (isTDeferBlockDetails(tDetails)) {
          deferBlocks.push({lContainer, lView, tNode, tDetails});
          // This LContainer represents a defer block, so we exit
          // this iteration and don't inspect views in this LContainer.
          continue;
        }
      }

      // The host can be an `LView` if this is the container
      // for a component that injects `ViewContainerRef`.
      if (isLView(lContainer[HOST])) {
        getDeferBlocks(lContainer[HOST], deferBlocks);
      }

      for (let j = CONTAINER_HEADER_OFFSET; j < lContainer.length; j++) {
        getDeferBlocks(lContainer[j] as LView, deferBlocks);
      }
    } else if (isLView(lView[i])) {
      // This is a component, enter the `getDeferBlocks` recursively.
      getDeferBlocks(lView[i], deferBlocks);
    }
  }
}