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mod request;
mod service;
use proc_macro::TokenStream;
use quote::quote;
use syn::DeriveInput;
#[proc_macro_derive(Request, attributes(rtype))]
pub fn message_derive_rtype(input: TokenStream) -> TokenStream {
let ast: DeriveInput = syn::parse(input).unwrap();
request::expand(&ast).into()
}
#[proc_macro_attribute]
pub fn service(args: TokenStream, input: TokenStream) -> TokenStream {
service::service(args, input)
}
#[allow(clippy::needless_doctest_main)]
#[proc_macro_attribute]
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
parse(input, args, false, false).unwrap_or_else(|e| e.to_compile_error().into())
}
#[proc_macro_attribute]
pub fn test(args: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
parse(input, args, true, false).unwrap_or_else(|e| e.to_compile_error().into())
}
#[doc(hidden)]
#[proc_macro_attribute]
pub fn tokio_main(args: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
parse(input, args, false, true).unwrap_or_else(|e| e.to_compile_error().into())
}
#[doc(hidden)]
#[proc_macro_attribute]
pub fn tokio_test(args: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
parse(input, args, true, true).unwrap_or_else(|e| e.to_compile_error().into())
}
fn parse(
mut input: syn::ItemFn,
_args: syn::AttributeArgs,
is_test: bool,
is_tokio: bool,
) -> Result<TokenStream, syn::Error> {
if input.sig.asyncness.take().is_none() {
let msg = "the `async` keyword is missing from the function declaration";
return Err(syn::Error::new_spanned(input.sig.fn_token, msg));
}
let body = &input.block;
let brace_token = input.block.brace_token;
let tokio = if is_tokio {
quote! { ::tokio }
} else {
quote! {}
};
input.block = syn::parse2(quote! {
{
#tokio::madsim::runtime::init_logger();
#tokio::madsim::runtime::Builder::from_env().run(|| async #body)
}
})
.expect("Parsing failure");
input.block.brace_token = brace_token;
let attribute = if is_test {
quote! { #[::core::prelude::v1::test] }
} else {
quote! {}
};
let result = quote! {
#attribute
#input
};
Ok(result.into())
}