Method isApplyingToNode

packages/core/src/render3/queries/query.ts:226–253

(tNode: TNode)

  }

  private isApplyingToNode(tNode: TNode): boolean {
    if (
      this._appliesToNextNode &&
      (this.metadata.flags & QueryFlags.descendants) !== QueryFlags.descendants
    ) {
      const declarationNodeIdx = this._declarationNodeIndex;
      let parent = tNode.parent;
      // Determine if a given TNode is a "direct" child of a node on which a content query was
      // declared (only direct children of query's host node can match with the descendants: false
      // option). There are 3 main use-case / conditions to consider here:
      // - <needs-target><i #target></i></needs-target>: here <i #target> parent node is a query
      // host node;
      // - <needs-target><ng-template [ngIf]="true"><i #target></i></ng-template></needs-target>:
      // here <i #target> parent node is null;
      // - <needs-target><ng-container><i #target></i></ng-container></needs-target>: here we need
      // to go past `<ng-container>` to determine <i #target> parent node (but we shouldn't traverse
      // up past the query's host node!).
      while (
        parent !== null &&
        parent.type & TNodeType.ElementContainer &&
        parent.index !== declarationNodeIdx
      ) {
        parent = parent.parent;
      }
      return declarationNodeIdx === (parent !== null ? parent.index : -1);
    }
    return this._appliesToNextNode;
  }

  private matchTNode(tView: TView, tNode: TNode): void {
    const predicate = this.metadata.predicate;