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concept: TryFromObject with message? #1

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18 changes: 18 additions & 0 deletions vm/src/pyobject.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1145,6 +1145,24 @@ pub trait TryFromObject: Sized {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>;
}

pub trait TryFromObjectWithMessage: Sized {
type Error: ?Sized;

fn try_from_object_with_message(
vm: &VirtualMachine,
obj: PyObjectRef,
error: Self::Error,
) -> PyResult<Self>;

fn default_error() -> Self::Error;
}

impl<T, F> TryFromObject for T where Self: Sized, T: TryFromObjectWithMessage<Error=F>, F: Fn(&VirtualMachine, PyObjectRef) -> PyBaseExceptionRef {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
Self::try_from_object_with_message(vm, obj, Self::default_error())
}
}

/// Implemented by any type that can be returned from a built-in Python function.
///
/// `IntoPyObject` has a blanket implementation for any built-in object payload,
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