Add DelegateErrorRaiser

crates/cgp-error-eyre/src/lib.rs

@@ -1,8 +1,8 @@
 use core::fmt::{Debug, Display};
 use std::error::Error as StdError;
 
-use cgp_core::prelude::*;
 use cgp_core::error::{ErrorRaiser, ProvideErrorType};
+use cgp_core::prelude::*;
 use eyre::{eyre, Report};
 
 pub struct ProvideEyreError;

crates/cgp-error-std/src/lib.rs

@@ -1,7 +1,7 @@
 use std::error::Error as StdError;
 
-use cgp_core::prelude::*;
 use cgp_core::error::{ErrorRaiser, ProvideErrorType};
+use cgp_core::prelude::*;
 
 pub type Error = Box<dyn StdError + Send + Sync + 'static>;
 

crates/cgp-error/src/can_raise_error.rs

@@ -0,0 +1,17 @@
+use cgp_async::Async;
+use cgp_component::{derive_component, DelegateComponent, HasComponents};
+
+use crate::has_error_type::HasErrorType;
+
+/**
+   Used for injecting external error types into [`Self::Error`](HasErrorType::Error).
+
+   As an example, if `Context: CanRaiseError<ParseIntError>`, then we would be
+   able to call `Context::raise_error(err)` for an error value
+   [`err: ParseIntError`](core::num::ParseIntError) and get back
+   a [`Context::Error`](HasErrorType::Error) value.
+*/
+#[derive_component(ErrorRaiserComponent, ErrorRaiser<Context>)]
+pub trait CanRaiseError<E>: HasErrorType {
+    fn raise_error(e: E) -> Self::Error;
+}

crates/cgp-error/src/delegate_error.rs

@@ -0,0 +1,19 @@
+use core::marker::PhantomData;
+
+use cgp_component::DelegateComponent;
+
+use crate::{ErrorRaiser, HasErrorType};
+
+pub struct DelegateErrorRaiser<Components>(pub PhantomData<Components>);
+
+impl<Context, Error, Components, Delegate> ErrorRaiser<Context, Error>
+    for DelegateErrorRaiser<Components>
+where
+    Context: HasErrorType,
+    Components: DelegateComponent<Error, Delegate = Delegate>,
+    Delegate: ErrorRaiser<Context, Error>,
+{
+    fn raise_error(e: Error) -> Context::Error {
+        Delegate::raise_error(e)
+    }
+}

crates/cgp-error/src/has_error_type.rs

@@ -0,0 +1,28 @@
+use core::fmt::Debug;
+
+use cgp_async::Async;
+use cgp_component::{derive_component, DelegateComponent, HasComponents};
+
+/**
+   This is used for contexts to declare that they have a _unique_ `Self::Error` type.
+
+   Although it is possible for each context to declare their own associated
+   `Error` type, doing so may result in having multiple ambiguous `Self::Error` types,
+   if there are multiple associated types with the same name in different traits.
+
+   As a result, it is better for context traits to include `HasError` as their
+   parent traits, so that multiple traits can all refer to the same abstract
+   `Self::Error` type.
+*/
+#[derive_component(ErrorTypeComponent, ProvideErrorType<Context>)]
+pub trait HasErrorType: Async {
+    /**
+       The `Error` associated type is also required to implement [`Debug`].
+
+       This is to allow `Self::Error` to be used in calls like `.unwrap()`,
+       as well as for simpler error logging.
+    */
+    type Error: Async + Debug;
+}
+
+pub type ErrorOf<Context> = <Context as HasErrorType>::Error;

crates/cgp-error/src/lib.rs

@@ -1,41 +1,7 @@
-use core::fmt::Debug;
+mod can_raise_error;
+mod delegate_error;
+mod has_error_type;
 
-use cgp_async::Async;
-use cgp_component::{derive_component, DelegateComponent, HasComponents};
-
-/**
-   This is used for contexts to declare that they have a _unique_ `Self::Error` type.
-
-   Although it is possible for each context to declare their own associated
-   `Error` type, doing so may result in having multiple ambiguous `Self::Error` types,
-   if there are multiple associated types with the same name in different traits.
-
-   As a result, it is better for context traits to include `HasError` as their
-   parent traits, so that multiple traits can all refer to the same abstract
-   `Self::Error` type.
-*/
-#[derive_component(ErrorTypeComponent, ProvideErrorType<Context>)]
-pub trait HasErrorType: Async {
-    /**
-       The `Error` associated type is also required to implement [`Debug`].
-
-       This is to allow `Self::Error` to be used in calls like `.unwrap()`,
-       as well as for simpler error logging.
-    */
-    type Error: Async + Debug;
-}
-
-pub type ErrorOf<Context> = <Context as HasErrorType>::Error;
-
-/**
-   Used for injecting external error types into [`Self::Error`](HasErrorType::Error).
-
-   As an example, if `Context: CanRaiseError<ParseIntError>`, then we would be
-   able to call `Context::raise_error(err)` for an error value
-   [`err: ParseIntError`](core::num::ParseIntError) and get back
-   a [`Context::Error`](HasErrorType::Error) value.
-*/
-#[derive_component(ErrorRaiserComponent, ErrorRaiser<Context>)]
-pub trait CanRaiseError<E>: HasErrorType {
-    fn raise_error(e: E) -> Self::Error;
-}
+pub use can_raise_error::*;
+pub use delegate_error::*;
+pub use has_error_type::*;