/
payload.rs
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/
payload.rs
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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use crate::dynutil::UpcastDataPayload;
use crate::prelude::*;
use crate::yoke::*;
use alloc::boxed::Box;
use databake::{Bake, CrateEnv, TokenStream};
trait ExportableYoke {
fn bake_yoke(&self, env: &CrateEnv) -> TokenStream;
fn serialize_yoke(
&self,
serializer: &mut dyn erased_serde::Serializer,
) -> Result<(), DataError>;
}
impl<Y, C> ExportableYoke for Yoke<Y, C>
where
Y: for<'a> Yokeable<'a>,
for<'a> <Y as Yokeable<'a>>::Output: Bake + serde::Serialize,
{
fn bake_yoke(&self, ctx: &CrateEnv) -> TokenStream {
self.get().bake(ctx)
}
fn serialize_yoke(
&self,
serializer: &mut dyn erased_serde::Serializer,
) -> Result<(), DataError> {
use erased_serde::Serialize;
self.get()
.erased_serialize(serializer)
.map_err(|e| DataError::custom("Serde export").with_display_context(&e))?;
Ok(())
}
}
#[derive(yoke::Yokeable)]
pub struct ExportBox {
payload: Box<dyn ExportableYoke + Sync>,
marker: Box<dyn Bake + Sync>,
}
impl<M> UpcastDataPayload<M> for ExportMarker
where
M: DataMarker + Default + Bake + 'static + Sync,
M::Yokeable: Sync,
for<'a> <M::Yokeable as Yokeable<'a>>::Output: Bake + serde::Serialize,
{
fn upcast(other: DataPayload<M>) -> DataPayload<ExportMarker> {
DataPayload::from_owned(ExportBox {
payload: Box::new(other.yoke),
marker: Box::new(M::default()),
})
}
}
impl DataPayload<ExportMarker> {
/// Serializes this [`DataPayload`] into a serializer using Serde.
///
/// # Examples
///
/// ```
/// use icu_provider::datagen::*;
/// use icu_provider::dynutil::UpcastDataPayload;
/// use icu_provider::hello_world::HelloWorldV1Marker;
/// use icu_provider::prelude::*;
///
/// // Create an example DataPayload
/// let payload: DataPayload<HelloWorldV1Marker> = Default::default();
/// let export: DataPayload<ExportMarker> = UpcastDataPayload::upcast(payload);
///
/// // Serialize the payload to a JSON string
/// let mut buffer: Vec<u8> = vec![];
/// export
/// .serialize(&mut serde_json::Serializer::new(&mut buffer))
/// .expect("Serialization should succeed");
/// assert_eq!("{\"message\":\"(und) Hello World\"}".as_bytes(), buffer);
/// ```
pub fn serialize<S>(&self, serializer: S) -> Result<(), DataError>
where
S: serde::Serializer,
S::Ok: 'static, // erased_serde requirement, cannot return values in `Ok`
{
self.get()
.payload
.serialize_yoke(&mut <dyn erased_serde::Serializer>::erase(serializer))
}
/// Serializes this [`DataPayload`]'s value and marker type into [`TokenStream`]s
/// using their [`Bake`] implementations.
///
/// # Examples
///
/// ```
/// use icu_provider::datagen::*;
/// use icu_provider::dynutil::UpcastDataPayload;
/// use icu_provider::hello_world::HelloWorldV1Marker;
/// use icu_provider::prelude::*;
/// # use databake::quote;
/// # use std::collections::BTreeSet;
///
/// // Create an example DataPayload
/// let payload: DataPayload<HelloWorldV1Marker> = Default::default();
/// let export: DataPayload<ExportMarker> = UpcastDataPayload::upcast(payload);
///
/// let env = databake::CrateEnv::default();
/// let (tokens, marker) = export.tokenize(&env);
/// assert_eq!(
/// quote! {
/// ::icu_provider::hello_world::HelloWorldV1 {
/// message: alloc::borrow::Cow::Borrowed("(und) Hello World"),
/// }
/// }
/// .to_string(),
/// tokens.to_string()
/// );
/// assert_eq!(
/// quote! { ::icu_provider::hello_world::HelloWorldV1Marker }.to_string(),
/// marker.to_string()
/// );
/// assert_eq!(
/// env.into_iter().collect::<BTreeSet<_>>(),
/// ["icu_provider", "alloc"]
/// .into_iter()
/// .collect::<BTreeSet<_>>()
/// );
/// ```
pub fn tokenize(&self, env: &CrateEnv) -> (TokenStream, TokenStream) {
(
self.get().payload.bake_yoke(env),
// This is a bit naughty, we need the marker's type, but we're actually
// baking its value. This works as long as all markers are unit structs.
self.get().marker.bake(env),
)
}
}
/// Marker type for [`ExportBox`].
#[allow(clippy::exhaustive_structs)] // marker type
pub struct ExportMarker {}
impl DataMarker for ExportMarker {
type Yokeable = ExportBox;
}