105 lines
2.9 KiB
Python
105 lines
2.9 KiB
Python
import sys
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from ast import (
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AsyncFunctionDef,
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FunctionDef,
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)
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from collections import deque
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from os.path import isabs
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from types import FrameType
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from typing import Any, Callable, Optional, cast
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from defer.errors import FreeVarsError
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from defer.sugar.transformer import RewriteDefer
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def _is_dunder(name: str) -> bool:
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return name.startswith("__") and name.endswith("__")
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def _is_excluded_path(filename: str) -> bool:
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if not filename:
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return True
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return (
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filename.startswith(sys.base_exec_prefix)
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or filename.startswith(sys.base_prefix)
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or filename.startswith(sys.exec_prefix)
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or filename.startswith(sys.prefix)
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or ".venv" in filename
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or filename.startswith("<frozen ")
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or filename.startswith("<string>")
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or filename.startswith("<pytest ")
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or "thirdparty" in filename
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or "__future__" in filename
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)
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class _ParseDefer:
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IDENTITY = lambda *_: None # noqa: E731
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def __init__(self, tracefn: Optional[Callable]) -> None:
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self.tracefn = tracefn or self.IDENTITY
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self.pending: deque[Executing] = deque()
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def __call__(self, frame: FrameType, event: str, arg: Any):
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try:
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self._do_call(frame, event, arg)
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except Exception:
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pass
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return self
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def _do_call(self, frame: FrameType, event: str, arg: Any):
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self.tracefn(frame, event, arg)
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try:
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filename = frame.f_code.co_filename
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except Exception:
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return
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if _is_excluded_path(filename):
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return
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if not isabs(filename):
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return
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if event != "line":
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return
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try:
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from executing.executing import Executing, Source
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except ImportError:
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return
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try:
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exc = Source.executing(frame)
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except Exception:
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return
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if not (stmt := next(iter(exc.statements), None)):
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return
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if isinstance(stmt, (AsyncFunctionDef, FunctionDef)):
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if _is_dunder(stmt.name):
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return
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self.pending.append(exc)
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return
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if not self.pending or frame.f_back is not self.pending[-1].frame.f_back:
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return
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stmts = self.pending.pop().statements
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node = cast(FunctionDef | AsyncFunctionDef, next(iter(stmts)))
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fn_name = node.name
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if fn_name not in frame.f_locals:
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return
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fn = frame.f_locals[fn_name]
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if fn.__module__ in sys.stdlib_module_names:
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return
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if fn.__code__.co_freevars:
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raise FreeVarsError(fn)
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if not (ast := RewriteDefer.transform(node)):
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return
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locals = frame.f_locals.copy()
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del locals[fn_name]
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exec(compile(ast, frame.f_code.co_filename, "exec"), frame.f_globals, locals)
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frame.f_locals[fn_name].__code__ = locals[fn_name].__code__ |