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//! [![crates.io version](https://img.shields.io/crates/v/safina-async-test-core.svg)](https://crates.io/crates/safina-async-test-core)
//! [![license: Apache 2.0](https://gitlab.com/leonhard-llc/safina-rs/-/raw/main/license-apache-2.0.svg)](http://www.apache.org/licenses/LICENSE-2.0)
//! [![unsafe forbidden](https://gitlab.com/leonhard-llc/safina-rs/-/raw/main/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)
//! [![pipeline status](https://gitlab.com/leonhard-llc/safina-rs/badges/main/pipeline.svg)](https://gitlab.com/leonhard-llc/safina-rs/-/pipelines)
//!
//! Procedural macro for the [`safina-async-test`](https://crates.io/crates/safina-async-test)
//! package
//!
//! ## Changelog
//! - V0.1.4 - Update docs.
//! - v0.1.3 - Use `safina-executor` v0.2.0.
//! - v0.1.2
//! - Depend on `safe_proc_macro2` and `safe_quote`.
//! - Work properly on test functions with annotations.
//! - v0.1.1 - Fix paths.
//! - v0.1.0 - Initial version
//!
//! # Release Process
//! 1. Edit `Cargo.toml` and bump version number.
//! 1. Run `./release.sh`
#![forbid(unsafe_code)]
use safe_proc_macro2::{Ident, TokenStream, TokenTree};
use safe_quote::quote_spanned;
#[proc_macro_attribute]
pub fn async_test(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
let mut result = proc_macro::TokenStream::from(impl_async_test(
safe_proc_macro2::TokenStream::from(attr),
safe_proc_macro2::TokenStream::from(item.clone()),
));
result.extend(item);
// let mut token_stream_string = String::new();
// for tree in result {
// token_stream_string.push_str(format!("tree: {:?}\n", tree).as_str());
// }
// panic!("TokenStream:\n{}", token_stream_string);
result
}
fn impl_async_test(attr: TokenStream, item: TokenStream) -> TokenStream {
if let Some(tree) = attr.into_iter().next() {
return quote_spanned!(tree.span()=>compile_error!("parameters not allowed"););
}
// Ident { ident: "async", span: #0 bytes(50..55) }
// Ident { ident: "fn", span: #0 bytes(56..58) }
// Ident { ident: "should_run_async_fn", span: #0 bytes(59..78) }
// Group { delimiter: Parenthesis, stream: TokenStream [], span: ...
// Group { delimiter: Brace, stream: TokenStream [Ident { ident: "println",...
let mut trees = item.into_iter();
let mut first;
loop {
first = trees.next();
match first {
Some(TokenTree::Ident(ref ident_async)) if *ident_async == "async" => break,
None => break,
_ => {}
}
}
if let (
Some(TokenTree::Ident(ref ident_async)),
Some(TokenTree::Ident(ref ident_fn)),
Some(TokenTree::Ident(ref ident_name)),
) = (&first, trees.next(), trees.next())
{
if *ident_async == "async" && *ident_fn == "fn" {
let async_name = ident_name.to_string() + "_";
let ident_async_name = Ident::new(&async_name, ident_name.span());
return quote_spanned!(ident_name.span()=>
#[test]
fn #ident_async_name () {
safina_async_test::start_timer_thread();
safina_async_test::Executor::new(2, 1).unwrap().block_on( #ident_name ())
}
);
}
}
if let Some(tree) = first {
return quote_spanned!(tree.span()=>compile_error!("expected async fn"););
}
panic!("expected async fn");
}
// The version below has two drawbacks:
// 1. IDEs don't know that the stuff inside `async_test! { async fn test1() { ... } }` is a
// function, so they don't provide formatting, auto-complete, or other useful editor functions.
// This is a fatal flaw.
// 2. It puts the test in a module with the same name as the test function,
// and a test function named `async_test`.
// So for `async_test! { async fn test1() {...} }` below, it makes
// `mod test1 { #[test] fn async_test() {...} }`.
// This makes IDE test output more verbose. Each test appears as its own category.
//
// macro_rules! async_test {
// (async fn $name:ident () $body:block) => {
// async fn $name() $body
//
// mod $name {
// #[test]
// fn async_test () {
// safina_executor::block_on(super::$name())
// }
// }
// }
// }
//
// async_test! {
// async fn test1() {
// println!("test1");
// }
// }
// The version below requires the user to keep the two names in sync.
// Also, the error messages are not great.
//
// macro_rules! async_test {
// ($name:ident) => {
// mod $name {
// #[test]
// fn async_test () {
// safina_executor::block_on(super::$name())
// }
// }
// }
// }
//
// async_test!(test1);
// async fn test1() {
// println!("test1");
// }
//
// async_test!(test1); // error[E0428]: the name `test1` is defined multiple times
// async fn test2() {
// println!("test2");
// }
//
// async_test!(test3); // error[E0423]: expected function, found module `super::test3`
// async fn test4() {
// println!("test4");
// }