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// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
use crate::__internal::Private;
use std::{
error::Error,
fmt::{Debug, Display},
marker::PhantomData,
};
/// Implemented by all generated enum types.
///
/// # Safety
/// - A `RepeatedView<Self>` or `RepeatedMut<Self>` must have the same internal
/// representation as erased enums in the runtime.
/// - For C++, this is `proto2::RepeatedField<c_int>`
/// - For UPB, this is an array compatible with `int32`
pub unsafe trait Enum: TryFrom<i32> {
/// The name of the enum.
const NAME: &'static str;
/// Returns `true` if the given numeric value matches one of the `Self`'s
/// defined values.
///
/// If `Self` is a closed enum, then `TryFrom<i32>` for `value` succeeds if
/// and only if this function returns `true`.
fn is_known(value: i32) -> bool;
}
/// An integer value wasn't known for an enum while converting.
pub struct UnknownEnumValue<T>(i32, PhantomData<T>);
impl<T> UnknownEnumValue<T> {
#[doc(hidden)]
pub fn new(_private: Private, unknown_value: i32) -> Self {
Self(unknown_value, PhantomData)
}
}
impl<T> Debug for UnknownEnumValue<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("UnknownEnumValue").field(&self.0).finish()
}
}
impl<T: Enum> Display for UnknownEnumValue<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let val = self.0;
let enum_name = T::NAME;
write!(f, "{val} is not a known value for {enum_name}")
}
}
impl<T: Enum> Error for UnknownEnumValue<T> {}
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