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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
use proc_macro2::TokenStream;
use quote::quote;
use syn::{
parse::{Parse, ParseStream},
Ident, Token, Type,
};
pub struct RemoteTypeArgs {
pub implementing_crate: Ident,
pub sep: Token![::],
pub ty: Type,
}
impl Parse for RemoteTypeArgs {
fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
Ok(Self {
implementing_crate: input.parse()?,
sep: input.parse()?,
ty: input.parse()?,
})
}
}
pub fn expand_remote_type(args: RemoteTypeArgs) -> TokenStream {
let RemoteTypeArgs {
implementing_crate,
ty,
..
} = args;
let existing_tag = quote! { #implementing_crate::UniFfiTag };
quote! {
unsafe impl ::uniffi::FfiConverter<crate::UniFfiTag> for #ty {
type FfiType = <#ty as ::uniffi::FfiConverter<#existing_tag>>::FfiType;
fn lower(obj: #ty) -> Self::FfiType {
<#ty as ::uniffi::FfiConverter<#existing_tag>>::lower(obj)
}
fn try_lift(v: Self::FfiType) -> ::uniffi::Result<#ty> {
<#ty as ::uniffi::FfiConverter<#existing_tag>>::try_lift(v)
}
fn write(obj: #ty, buf: &mut Vec<u8>) {
<#ty as ::uniffi::FfiConverter<#existing_tag>>::write(obj, buf)
}
fn try_read(buf: &mut &[u8]) -> ::uniffi::Result<#ty> {
<#ty as ::uniffi::FfiConverter<#existing_tag>>::try_read(buf)
}
const TYPE_ID_META: ::uniffi::MetadataBuffer =
<#ty as ::uniffi::FfiConverter<#existing_tag>>::TYPE_ID_META;
}
::uniffi::derive_ffi_traits!(local #ty);
}
}