Function forLoopFinder

packages/core/src/render3/util/control_flow.ts:166–210

({
  lView,
  slotIdx,
}: ControlFlowBlockViewFinderConfig)

 * @returns
 */
const forLoopFinder: ControlFlowBlockViewFinder = ({
  lView,
  slotIdx,
}: ControlFlowBlockViewFinderConfig) => {
  const slot = lView[slotIdx];

  if (!isRepeaterMetadata(slot)) {
    return null;
  }

  const metadata = slot;
  const liveCollection = metadata.liveCollection;
  const items: unknown[] = [];

  if (liveCollection) {
    for (let j = 0; j < liveCollection.length; j++) {
      items.push(liveCollection.at(j));
    }
  }

  const containerIndex = slotIdx + 1;
  const lContainer = lView[containerIndex];
  const rootNodes: Node[] = [];

  if (isLContainer(lContainer)) {
    // Collect root nodes from each view in the container
    for (let viewIdx = CONTAINER_HEADER_OFFSET; viewIdx < lContainer.length; viewIdx++) {
      const viewAtIdx = lContainer[viewIdx];
      if (isLView(viewAtIdx)) {
        const viewTView = viewAtIdx[TVIEW];
        const viewNodes = collectNativeNodes(viewTView, viewAtIdx, viewTView.firstChild, []);
        rootNodes.push(...viewNodes);
      }
    }
  }

  return {
    type: ControlFlowBlockType.For,
    items,
    hasEmptyBlock: metadata.hasEmptyBlock,
    rootNodes,
    hostNode: lContainer[HOST] as Node,
    trackExpression: getTrackExpression(metadata),
  } satisfies ForLoopBlockData;
};

// Represents all supported control flow block finders.
const CONTROL_FLOW_BLOCK_FINDERS: ControlFlowBlockViewFinder[] = [deferBlockFinder, forLoopFinder];