def _remove_do_not_care(oldtype: cst.BaseExpression) -> cst.BaseExpression:
"""
Given a BaseExpression from a type, return a new BaseExpression that does not
refer to a DoNotCareSentinel.
"""
return ensure_type(oldtype.visit(RemoveDoNotCareFromGeneric()),
cst.BaseExpression)
def _remove_types(oldtype: cst.BaseExpression,
values: Sequence[str]) -> cst.BaseExpression:
"""
Given a BaseExpression from a type, return a new BaseExpression that does not
refer to any types listed in values.
"""
return ensure_type(oldtype.visit(RemoveTypesFromGeneric(values)),
cst.BaseExpression)
def _convert_match_nodes_to_cst_nodes(
matchtype: cst.BaseExpression, ) -> cst.BaseExpression:
"""
Given a BaseExpression in a type, convert this to a new BaseExpression that refers
to LibCST nodes instead of forward references to matcher nodes.
"""
return ensure_type(matchtype.visit(MatcherClassToLibCSTClass()),
cst.BaseExpression)