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from dataclasses import dataclass
from typing import Iterator, 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
def visit_default(self, node: LN) -> Iterator[T]:
indent = " " * (2 * self.tree_depth)
if isinstance(node, Node):
_type = type_repr(node.type)
out(f"{indent}{_type}", fg="yellow")
self.tree_depth += 1
for child in node.children:
yield from self.visit(child)
self.tree_depth -= 1
out(f"{indent}/{_type}", fg="yellow", bold=False)
else:
_type = token.tok_name.get(node.type, str(node.type))
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.
out(f" {node.prefix!r}", fg="green", bold=False, nl=False)
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))
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