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from __future__ import annotations
import ast
import sys
from typing import TYPE_CHECKING, Any, Callable, Literal, overload
if TYPE_CHECKING:
from os import PathLike
from _typeshed import ReadableBuffer
if sys.version_info >= (3, 11):
from typing import Self
else:
from typing_extensions import Self
class _CatchDisplay:
"""Class to temporarily catch sys.displayhook."""
def __init__(self) -> None:
self.output: Any | None = None
def __enter__(self) -> Self:
self.old_hook: Callable[[object], Any] = sys.displayhook
sys.displayhook = self
return self
def __exit__(self, type, value, traceback) -> Literal[False]:
sys.displayhook = self.old_hook
# Returning False will cause exceptions to propagate
return False
def __call__(self, output: Any) -> None:
self.output = output
@overload
def eval_block(
code: str | Any,
namespace: dict[str, Any] | None = ...,
filename: str | ReadableBuffer | PathLike[Any] = ...,
*,
strict: Literal[False] = ...,
) -> Any | None: ...
@overload
def eval_block(
code: str | Any,
namespace: dict[str, Any] | None = ...,
filename: str | ReadableBuffer | PathLike[Any] = ...,
*,
strict: Literal[True] = ...,
) -> Any: ...
def eval_block(
code: str | Any,
namespace: dict[str, Any] | None = None,
filename: str | ReadableBuffer | PathLike[Any] = "<string>",
*,
strict: bool = False,
) -> Any | None:
"""
Execute a multi-line block of code in the given namespace.
If the final statement in the code is an expression, return
the result of the expression.
If ``strict``, raise a ``TypeError`` when the return value would be ``None``.
"""
tree = ast.parse(code, filename="<ast>", mode="exec")
if namespace is None:
namespace = {}
catch_display = _CatchDisplay()
if isinstance(tree.body[-1], ast.Expr):
to_exec, to_eval = tree.body[:-1], tree.body[-1:]
else:
to_exec, to_eval = tree.body, []
for node in to_exec:
compiled = compile(ast.Module([node], []), filename=filename, mode="exec")
exec(compiled, namespace)
with catch_display:
for node in to_eval:
compiled = compile(
ast.Interactive([node]), filename=filename, mode="single"
)
exec(compiled, namespace)
if strict:
output = catch_display.output
if output is None:
msg = f"Expected a non-None value but got {output!r}"
raise TypeError(msg)
else:
return output
else:
return catch_display.output
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