#![deny(rust_2018_idioms, nonstandard_style)]
#![doc(html_logo_url = "https://actix.rs/img/logo.png")]
#![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
use proc_macro::TokenStream;
use quote::quote;
#[allow(clippy::needless_doctest_main)]
#[proc_macro_attribute]
#[cfg(not(test))] pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let mut input = match syn::parse::<syn::ItemFn>(item.clone()) {
Ok(input) => input,
Err(err) => return input_and_compile_error(item, err),
};
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
let attrs = &input.attrs;
let vis = &input.vis;
let sig = &mut input.sig;
let body = &input.block;
if sig.asyncness.is_none() {
return syn::Error::new_spanned(
sig.fn_token,
"the async keyword is missing from the function declaration",
)
.to_compile_error()
.into();
}
let mut system = syn::parse_str::<syn::Path>("::actix_rt::System").unwrap();
for arg in &args {
match arg {
syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
lit: syn::Lit::Str(lit),
path,
..
})) => match path
.get_ident()
.map(|i| i.to_string().to_lowercase())
.as_deref()
{
Some("system") => match lit.parse() {
Ok(path) => system = path,
Err(_) => {
return syn::Error::new_spanned(lit, "Expected path")
.to_compile_error()
.into();
}
},
_ => {
return syn::Error::new_spanned(arg, "Unknown attribute specified")
.to_compile_error()
.into();
}
},
_ => {
return syn::Error::new_spanned(arg, "Unknown attribute specified")
.to_compile_error()
.into();
}
}
}
sig.asyncness = None;
(quote! {
#(#attrs)*
#vis #sig {
<#system>::new().block_on(async move { #body })
}
})
.into()
}
#[proc_macro_attribute]
pub fn test(args: TokenStream, item: TokenStream) -> TokenStream {
let mut input = match syn::parse::<syn::ItemFn>(item.clone()) {
Ok(input) => input,
Err(err) => return input_and_compile_error(item, err),
};
let args = syn::parse_macro_input!(args as syn::AttributeArgs);
let attrs = &input.attrs;
let vis = &input.vis;
let sig = &mut input.sig;
let body = &input.block;
let mut has_test_attr = false;
for attr in attrs {
if attr.path.is_ident("test") {
has_test_attr = true;
}
}
if sig.asyncness.is_none() {
return syn::Error::new_spanned(
input.sig.fn_token,
"the async keyword is missing from the function declaration",
)
.to_compile_error()
.into();
}
sig.asyncness = None;
let missing_test_attr = if has_test_attr {
quote! {}
} else {
quote! { #[::core::prelude::v1::test] }
};
let mut system = syn::parse_str::<syn::Path>("::actix_rt::System").unwrap();
for arg in &args {
match arg {
syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
lit: syn::Lit::Str(lit),
path,
..
})) => match path
.get_ident()
.map(|i| i.to_string().to_lowercase())
.as_deref()
{
Some("system") => match lit.parse() {
Ok(path) => system = path,
Err(_) => {
return syn::Error::new_spanned(lit, "Expected path")
.to_compile_error()
.into();
}
},
_ => {
return syn::Error::new_spanned(arg, "Unknown attribute specified")
.to_compile_error()
.into();
}
},
_ => {
return syn::Error::new_spanned(arg, "Unknown attribute specified")
.to_compile_error()
.into();
}
}
}
(quote! {
#missing_test_attr
#(#attrs)*
#vis #sig {
<#system>::new().block_on(async { #body })
}
})
.into()
}
fn input_and_compile_error(mut item: TokenStream, err: syn::Error) -> TokenStream {
let compile_err = TokenStream::from(err.to_compile_error());
item.extend(compile_err);
item
}