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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 core::any::Any;
use crate::dynutil::UpcastDataPayload;
use crate::prelude::*;
use alloc::boxed::Box;
use databake::{Bake, CrateEnv, TokenStream};
use yoke::trait_hack::YokeTraitHack;
use yoke::*;
trait ExportableDataPayload {
fn bake_yoke(&self, env: &CrateEnv) -> TokenStream;
fn serialize_yoke(
&self,
serializer: &mut dyn erased_serde::Serializer,
) -> Result<(), DataError>;
fn as_any(&self) -> &dyn Any;
fn eq_dyn(&self, other: &dyn ExportableDataPayload) -> bool;
}
impl<M: DataMarker> ExportableDataPayload for DataPayload<M>
where
for<'a> <M::Yokeable as Yokeable<'a>>::Output: Bake + serde::Serialize,
for<'a> YokeTraitHack<<M::Yokeable as Yokeable<'a>>::Output>: PartialEq,
{
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(())
}
fn as_any(&self) -> &dyn Any {
self
}
fn eq_dyn(&self, other: &dyn ExportableDataPayload) -> bool {
match other.as_any().downcast_ref::<Self>() {
Some(downcasted) => (*self).eq(downcasted),
None => {
debug_assert!(
false,
"cannot compare ExportableDataPayloads of different types: self is {:?} but other is {:?}",
self.type_id(),
other.as_any().type_id(),
);
false
}
}
}
}
#[doc(hidden)] // exposed for make_exportable_provider
#[derive(yoke::Yokeable)]
pub struct ExportBox {
payload: Box<dyn ExportableDataPayload + Sync + Send>,
}
impl PartialEq for ExportBox {
fn eq(&self, other: &Self) -> bool {
self.payload.eq_dyn(&*other.payload)
}
}
impl core::fmt::Debug for ExportBox {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.debug_struct("ExportBox")
.field("payload", &"<payload>")
.finish()
}
}
impl<M> UpcastDataPayload<M> for ExportMarker
where
M: DataMarker,
M::Yokeable: Sync + Send,
for<'a> <M::Yokeable as Yokeable<'a>>::Output: Bake + serde::Serialize,
for<'a> YokeTraitHack<<M::Yokeable as Yokeable<'a>>::Output>: PartialEq,
{
fn upcast(other: DataPayload<M>) -> DataPayload<ExportMarker> {
DataPayload::from_owned(ExportBox {
payload: Box::new(other),
})
}
}
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!(r#"{"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 into a [`TokenStream`]
/// using its [`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 = 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!(
/// env.into_iter().collect::<BTreeSet<_>>(),
/// ["icu_provider", "alloc"]
/// .into_iter()
/// .collect::<BTreeSet<_>>()
/// );
/// ```
pub fn tokenize(&self, env: &CrateEnv) -> TokenStream {
self.get().payload.bake_yoke(env)
}
}
/// Marker type for [`ExportBox`].
#[allow(clippy::exhaustive_structs)] // marker type
#[derive(Debug)]
pub struct ExportMarker {}
impl DataMarker for ExportMarker {
type Yokeable = ExportBox;
}
#[cfg(test)]
mod tests {
use super::*;
use crate::hello_world::*;
#[test]
fn test_compare_with_dyn() {
let payload1: DataPayload<HelloWorldV1Marker> = DataPayload::from_owned(HelloWorldV1 {
message: "abc".into(),
});
let payload2: DataPayload<HelloWorldV1Marker> = DataPayload::from_owned(HelloWorldV1 {
message: "abc".into(),
});
let payload3: DataPayload<HelloWorldV1Marker> = DataPayload::from_owned(HelloWorldV1 {
message: "def".into(),
});
assert!(payload1.eq_dyn(&payload2));
assert!(payload2.eq_dyn(&payload1));
assert!(!payload1.eq_dyn(&payload3));
assert!(!payload3.eq_dyn(&payload1));
}
#[test]
fn test_export_marker_partial_eq() {
let payload1: DataPayload<ExportMarker> =
UpcastDataPayload::upcast(DataPayload::<HelloWorldV1Marker>::from_owned(
HelloWorldV1 {
message: "abc".into(),
},
));
let payload2: DataPayload<ExportMarker> =
UpcastDataPayload::upcast(DataPayload::<HelloWorldV1Marker>::from_owned(
HelloWorldV1 {
message: "abc".into(),
},
));
let payload3: DataPayload<ExportMarker> =
UpcastDataPayload::upcast(DataPayload::<HelloWorldV1Marker>::from_owned(
HelloWorldV1 {
message: "def".into(),
},
));
assert_eq!(payload1, payload2);
assert_eq!(payload2, payload1);
assert_ne!(payload1, payload3);
assert_ne!(payload3, payload1);
}
}