pytype.pytd.base_visitor.Visitor

Base class for visitors. Each class inheriting from visitor SHOULD have a fixed set of methods, otherwise it might break the caching in this class. Attributes: visits_all_node_types: Whether the visitor can visit every node type. unchecked_node_names: Contains the names of node classes that are unchecked when constructing a new node from visited children. This is useful if a visitor returns data in part or all of its walk that would violate node preconditions. enter_functions: A dictionary mapping node class names to the corresponding Enter functions. visit_functions: A dictionary mapping node class names to the corresponding Visit functions. leave_functions: A dictionary mapping node class names to the corresponding Leave functions. visit_class_names: A set of node class names that must be visited. This is constructed based on the enter/visit/leave functions and precondition data about legal ASTs. As an optimization, the visitor will only visit nodes under which some actionable node can appear.