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import inspect
from functools import partial
from typing import (
Any,
Callable,
Iterable,
List,
Optional,
Tuple,
Type,
TypeVar,
Union,
overload,
)
T = TypeVar("T")
Result = Iterable[Union[Any, Tuple[Any], Tuple[str, Any], Tuple[str, Any, Any]]]
RichReprResult = Result
class ReprError(Exception):
"""An error occurred when attempting to build a repr."""
@overload
def auto(cls: Optional[Type[T]]) -> Type[T]:
...
@overload
def auto(*, angular: bool = False) -> Callable[[Type[T]], Type[T]]:
...
def auto(
cls: Optional[Type[T]] = None, *, angular: Optional[bool] = None
) -> Union[Type[T], Callable[[Type[T]], Type[T]]]:
"""Class decorator to create __repr__ from __rich_repr__"""
def do_replace(cls: Type[T], angular: Optional[bool] = None) -> Type[T]:
def auto_repr(self: T) -> str:
"""Create repr string from __rich_repr__"""
repr_str: List[str] = []
append = repr_str.append
angular: bool = getattr(self.__rich_repr__, "angular", False) # type: ignore[attr-defined]
for arg in self.__rich_repr__(): # type: ignore[attr-defined]
if isinstance(arg, tuple):
if len(arg) == 1:
append(repr(arg[0]))
else:
key, value, *default = arg
if key is None:
append(repr(value))
else:
if len(default) and default[0] == value:
continue
append(f"{key}={value!r}")
else:
append(repr(arg))
if angular:
return f"<{self.__class__.__name__} {' '.join(repr_str)}>"
else:
return f"{self.__class__.__name__}({', '.join(repr_str)})"
def auto_rich_repr(self: Type[T]) -> Result:
"""Auto generate __rich_rep__ from signature of __init__"""
try:
signature = inspect.signature(self.__init__)
for name, param in signature.parameters.items():
if param.kind == param.POSITIONAL_ONLY:
yield getattr(self, name)
elif param.kind in (
param.POSITIONAL_OR_KEYWORD,
param.KEYWORD_ONLY,
):
if param.default == param.empty:
yield getattr(self, param.name)
else:
yield param.name, getattr(self, param.name), param.default
except Exception as error:
raise ReprError(
f"Failed to auto generate __rich_repr__; {error}"
) from None
if not hasattr(cls, "__rich_repr__"):
auto_rich_repr.__doc__ = "Build a rich repr"
cls.__rich_repr__ = auto_rich_repr # type: ignore[attr-defined]
auto_repr.__doc__ = "Return repr(self)"
cls.__repr__ = auto_repr # type: ignore[assignment]
if angular is not None:
cls.__rich_repr__.angular = angular # type: ignore[attr-defined]
return cls
if cls is None:
return partial(do_replace, angular=angular)
else:
return do_replace(cls, angular=angular)
@overload
def rich_repr(cls: Optional[Type[T]]) -> Type[T]:
...
@overload
def rich_repr(*, angular: bool = False) -> Callable[[Type[T]], Type[T]]:
...
def rich_repr(
cls: Optional[Type[T]] = None, *, angular: bool = False
) -> Union[Type[T], Callable[[Type[T]], Type[T]]]:
if cls is None:
return auto(angular=angular)
else:
return auto(cls)
if __name__ == "__main__":
@auto
class Foo:
def __rich_repr__(self) -> Result:
yield "foo"
yield "bar", {"shopping": ["eggs", "ham", "pineapple"]}
yield "buy", "hand sanitizer"
foo = Foo()
from pip._vendor.rich.console import Console
console = Console()
console.rule("Standard repr")
console.print(foo)
console.print(foo, width=60)
console.print(foo, width=30)
console.rule("Angular repr")
Foo.__rich_repr__.angular = True # type: ignore[attr-defined]
console.print(foo)
console.print(foo, width=60)
console.print(foo, width=30)
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