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#![cfg(feature = "async-await-preview")]
extern crate proc_macro;
use proc_macro::TokenStream;
use quote::{quote, quote_spanned};
use syn::spanned::Spanned;
/// Define the program entry point
///
/// # Examples
///
/// ```
/// #[tokio::main]
/// async fn main() {
/// println!("Hello world");
/// }
#[proc_macro_attribute]
pub fn main(_attr: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let ret = &input.decl.output;
let name = &input.ident;
let body = &input.block;
if input.asyncness.is_none() {
let tokens = quote_spanned! { input.span() =>
compile_error!("the async keyword is missing from the function declaration");
};
return TokenStream::from(tokens);
}
let result = quote! {
fn #name() #ret {
let mut rt = tokio::runtime::Runtime::new().unwrap();
rt.block_on_async(async { #body })
}
};
result.into()
}
/// Define a Tokio aware unit test
///
/// # Examples
///
/// ```
/// #[tokio::test]
/// async fn my_test() {
/// assert!(true);
/// }
/// ```
#[proc_macro_attribute]
pub fn test(_attr: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let ret = &input.decl.output;
let name = &input.ident;
let body = &input.block;
let attrs = &input.attrs;
if input.asyncness.is_none() {
let tokens = quote_spanned! { input.span() =>
compile_error!("the async keyword is missing from the function declaration");
};
return TokenStream::from(tokens);
}
let result = quote! {
#[test]
#(#attrs)*
fn #name() #ret {
let mut rt = tokio::runtime::current_thread::Runtime::new().unwrap();
rt.block_on_async(async { #body })
}
};
result.into()
}
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