Function enterDI

packages/core/src/render3/state.ts:575–621

(lView: LView, tNode: TNode, flags: InternalInjectFlags)

 *     - If `false` than this call failed and we should NOT call `leaveDI`
 */
export function enterDI(lView: LView, tNode: TNode, flags: InternalInjectFlags) {
  ngDevMode && assertLViewOrUndefined(lView);

  if (flags & InternalInjectFlags.SkipSelf) {
    ngDevMode && assertTNodeForTView(tNode, lView[TVIEW]);

    let parentTNode = tNode as TNode | null;
    let parentLView = lView;

    while (true) {
      ngDevMode && assertDefined(parentTNode, 'Parent TNode should be defined');
      parentTNode = parentTNode!.parent as TNode | null;
      if (parentTNode === null && !(flags & InternalInjectFlags.Host)) {
        parentTNode = getDeclarationTNode(parentLView);
        if (parentTNode === null) break;

        // In this case, a parent exists and is definitely an element. So it will definitely
        // have an existing lView as the declaration view, which is why we can assume it's defined.
        ngDevMode && assertDefined(parentLView, 'Parent LView should be defined');
        parentLView = parentLView[DECLARATION_VIEW]!;

        // In Ivy there are Comment nodes that correspond to ngIf and NgFor embedded directives
        // We want to skip those and look only at Elements and ElementContainers to ensure
        // we're looking at true parent nodes, and not content or other types.
        if (parentTNode.type & (TNodeType.Element | TNodeType.ElementContainer)) {
          break;
        }
      } else {
        break;
      }
    }
    if (parentTNode === null) {
      // If we failed to find a parent TNode this means that we should use module injector.
      return false;
    } else {
      tNode = parentTNode;
      lView = parentLView;
    }
  }

  ngDevMode && assertTNodeForLView(tNode, lView);
  const lFrame = (instructionState.lFrame = allocLFrame());
  lFrame.currentTNode = tNode;
  lFrame.lView = lView;

  return true;
}

/**
 * Swap the current lView with a new lView.