+++ /dev/null
-from dataclasses import dataclass, field
-from typing import Any, Iterator, List, TypeVar, Union
-
-from black.nodes import Visitor
-from black.output import out
-from black.parsing import lib2to3_parse
-from blib2to3.pgen2 import token
-from blib2to3.pytree import Leaf, Node, type_repr
-
-LN = Union[Leaf, Node]
-T = TypeVar("T")
-
-
-@dataclass
-class DebugVisitor(Visitor[T]):
- tree_depth: int = 0
- list_output: List[str] = field(default_factory=list)
- print_output: bool = True
-
- def out(self, message: str, *args: Any, **kwargs: Any) -> None:
- self.list_output.append(message)
- if self.print_output:
- out(message, *args, **kwargs)
-
- def visit_default(self, node: LN) -> Iterator[T]:
- indent = " " * (2 * self.tree_depth)
- if isinstance(node, Node):
- _type = type_repr(node.type)
- self.out(f"{indent}{_type}", fg="yellow")
- self.tree_depth += 1
- for child in node.children:
- yield from self.visit(child)
-
- self.tree_depth -= 1
- self.out(f"{indent}/{_type}", fg="yellow", bold=False)
- else:
- _type = token.tok_name.get(node.type, str(node.type))
- self.out(f"{indent}{_type}", fg="blue", nl=False)
- if node.prefix:
- # We don't have to handle prefixes for `Node` objects since
- # that delegates to the first child anyway.
- self.out(f" {node.prefix!r}", fg="green", bold=False, nl=False)
- self.out(f" {node.value!r}", fg="blue", bold=False)
-
- @classmethod
- def show(cls, code: Union[str, Leaf, Node]) -> None:
- """Pretty-print the lib2to3 AST of a given string of `code`.
-
- Convenience method for debugging.
- """
- v: DebugVisitor[None] = DebugVisitor()
- if isinstance(code, str):
- code = lib2to3_parse(code)
- list(v.visit(code))