33 lines
1.2 KiB
Python
33 lines
1.2 KiB
Python
@dataclass
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class DebugVisitor(Visitor[T]):
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tree_depth: int = 0
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def visit_default(self, node: LN) -> Iterator[T]:
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indent = ' ' * (2 * self.tree_depth)
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if isinstance(node, Node):
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_type = type_repr(node.type)
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out(f'{indent}{_type}', fg='yellow')
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self.tree_depth += 1
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for child in node.children:
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yield from self.visit(child)
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self.tree_depth -= 1
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out(f'{indent}/{_type}', fg='yellow', bold=False)
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else:
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_type = token.tok_name.get(node.type, str(node.type))
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out(f'{indent}{_type}', fg='blue', nl=False)
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if node.prefix:
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# We don't have to handle prefixes for `Node` objects since
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# that delegates to the first child anyway.
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out(f' {node.prefix!r}', fg='green', bold=False, nl=False)
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out(f' {node.value!r}', fg='blue', bold=False)
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@classmethod
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def show(cls, code: str) -> None:
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"""Pretty-prints a given string of `code`.
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Convenience method for debugging.
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"""
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v: DebugVisitor[None] = DebugVisitor()
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list(v.visit(lib2to3_parse(code)))
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