from typing import Any


class TagVisitor:
    """
    Visitor to extract and embed tags and directives into the parsed structure.
    """

    @staticmethod
    def visit(data: Any) -> Any:
        """
        Traverse and tag the structure.

        Args:
            data (Any): The parsed data structure.

        Returns:
            Any: Data with tags and directives extracted (placeholder).
        """
        if isinstance(data, dict) and "_tags" not in data:
            data["_tags"] = []
        return data
