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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::collections::BTreeMap;
use proc_macro2::{Ident, TokenStream};
use quote::{format_ident, quote, quote_spanned};
use uniffi_meta::{checksum, FnMetadata, MethodMetadata, Type};
pub(crate) mod metadata;
mod scaffolding;
pub use self::metadata::gen_metadata;
use self::{
metadata::convert::{convert_type, try_split_result},
scaffolding::{gen_fn_scaffolding, gen_method_scaffolding},
};
use crate::util::{assert_type_eq, create_metadata_static_var};
// TODO(jplatte): Ensure no generics, no async, …
// TODO(jplatte): Aggregate errors instead of short-circuiting, wherever possible
pub enum ExportItem {
Function {
sig: Signature,
metadata: FnMetadata,
},
Impl {
self_ident: Ident,
methods: Vec<syn::Result<Method>>,
},
}
pub struct Method {
sig: Signature,
metadata: MethodMetadata,
}
pub struct Signature {
ident: Ident,
inputs: Vec<syn::FnArg>,
output: Option<FunctionReturn>,
}
impl Signature {
fn new(item: syn::Signature) -> syn::Result<Self> {
let output = match item.output {
syn::ReturnType::Default => None,
syn::ReturnType::Type(_, ty) => Some(FunctionReturn::new(ty)?),
};
Ok(Self {
ident: item.ident,
inputs: item.inputs.into_iter().collect(),
output,
})
}
}
pub struct FunctionReturn {
ty: Box<syn::Type>,
throws: Option<Ident>,
}
impl FunctionReturn {
fn new(ty: Box<syn::Type>) -> syn::Result<Self> {
Ok(match try_split_result(&ty)? {
Some((ok_type, throws)) => FunctionReturn {
ty: Box::new(ok_type.to_owned()),
throws: Some(throws),
},
None => FunctionReturn { ty, throws: None },
})
}
}
pub fn expand_export(metadata: ExportItem, mod_path: &[String]) -> TokenStream {
match metadata {
ExportItem::Function { sig, metadata } => {
let checksum = checksum(&metadata);
let scaffolding = gen_fn_scaffolding(&sig, mod_path, checksum);
let type_assertions = fn_type_assertions(&sig);
let meta_static_var = create_metadata_static_var(&sig.ident, metadata.into());
quote! {
#scaffolding
#type_assertions
#meta_static_var
}
}
ExportItem::Impl {
methods,
self_ident,
} => {
let method_tokens: TokenStream = methods
.into_iter()
.map(|res| {
res.map_or_else(
syn::Error::into_compile_error,
|Method { sig, metadata }| {
let checksum = checksum(&metadata);
let scaffolding =
gen_method_scaffolding(&sig, mod_path, checksum, &self_ident);
let type_assertions = fn_type_assertions(&sig);
let meta_static_var = create_metadata_static_var(
&format_ident!("{}_{}", metadata.self_name, sig.ident),
metadata.into(),
);
quote! {
#scaffolding
#type_assertions
#meta_static_var
}
},
)
})
.collect();
quote_spanned! {self_ident.span()=>
::uniffi::deps::static_assertions::assert_type_eq_all!(
#self_ident,
crate::uniffi_types::#self_ident
);
#method_tokens
}
}
}
}
fn fn_type_assertions(sig: &Signature) -> TokenStream {
// Convert uniffi_meta::Type back to a Rust type
fn convert_type_back(ty: &Type) -> TokenStream {
match &ty {
Type::U8 => quote! { ::std::primitive::u8 },
Type::U16 => quote! { ::std::primitive::u16 },
Type::U32 => quote! { ::std::primitive::u32 },
Type::U64 => quote! { ::std::primitive::u64 },
Type::I8 => quote! { ::std::primitive::i8 },
Type::I16 => quote! { ::std::primitive::i16 },
Type::I32 => quote! { ::std::primitive::i32 },
Type::I64 => quote! { ::std::primitive::i64 },
Type::F32 => quote! { ::std::primitive::f32 },
Type::F64 => quote! { ::std::primitive::f64 },
Type::Bool => quote! { ::std::primitive::bool },
Type::String => quote! { ::std::string::String },
Type::Option { inner_type } => {
let inner = convert_type_back(inner_type);
quote! { ::std::option::Option<#inner> }
}
Type::Vec { inner_type } => {
let inner = convert_type_back(inner_type);
quote! { ::std::vec::Vec<#inner> }
}
Type::HashMap {
key_type,
value_type,
} => {
let key = convert_type_back(key_type);
let value = convert_type_back(value_type);
quote! { ::std::collections::HashMap<#key, #value> }
}
Type::ArcObject { object_name } => {
let object_ident = format_ident!("{object_name}");
quote! { ::std::sync::Arc<crate::uniffi_types::#object_ident> }
}
Type::Unresolved { name } => {
let ident = format_ident!("{name}");
quote! { crate::uniffi_types::#ident }
}
}
}
let input_types = sig.inputs.iter().filter_map(|input| match input {
syn::FnArg::Receiver(_) => None,
syn::FnArg::Typed(pat_ty) => match &*pat_ty.pat {
// Self type is asserted separately for impl blocks
syn::Pat::Ident(i) if i.ident == "self" => None,
_ => Some(&pat_ty.ty),
},
});
let output_type = sig.output.as_ref().map(|s| &s.ty);
let type_assertions: BTreeMap<_, _> = input_types
.chain(output_type)
.filter_map(|ty| {
convert_type(ty).ok().map(|meta_ty| {
let expected_ty = convert_type_back(&meta_ty);
let assert = assert_type_eq(ty, expected_ty);
(meta_ty, assert)
})
})
.collect();
let input_output_type_assertions: TokenStream = type_assertions.into_values().collect();
let throws_type_assertion = sig.output.as_ref().and_then(|s| {
let ident = s.throws.as_ref()?;
Some(assert_type_eq(
ident,
quote! { crate::uniffi_types::#ident },
))
});
quote! {
#input_output_type_assertions
#throws_type_assertion
}
}
|
