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#![allow(unused_doc_comments)]
#![allow(dead_code)]
#![allow(unused_imports)]
use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::{quote, quote_spanned};
use syn::parse::{Parse, ParseStream};
use syn::spanned::Spanned;
use syn::Expr;
use futures::executor::block_on;
#[proc_macro_attribute]
pub fn main(attr: TokenStream, item: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(item as syn::ItemFn);
let opts = syn::parse_macro_input!(attr as Opts);
let ret = &input.sig.output;
let inputs = &input.sig.inputs;
let name = &input.sig.ident;
let body = &input.block;
#[allow(unused_variables)]
let attrs = &input.attrs;
let vis = &input.vis;
let crate_root = opts.crate_root;
let threads = match opts.threads {
Some((num, span)) => {
let num = num.to_string();
Some(quote_spanned!(span=> #num))
}
#[cfg(feature = "auto")]
None => Some(quote! {
#crate_root::std::string::ToString::to_string(
&#crate_root::std::cmp::max(#crate_root::num_cpus::get(), 1)
)
}),
#[cfg(not(feature = "auto"))]
None => None,
};
#[allow(unused_variables)]
let set_threads = threads.map(|threads| {
quote! {
#crate_root::std::env::set_var(
"RUSTBASIC-THREADS",
#threads,
);
}
});
let result : proc_macro2::TokenStream;
match input.sig.asyncness {
None | Some(_) if input.sig.ident != "main" => { result = quote! {
#vis fn #name(#inputs) #ret {
#body
}
}
}
_ => { result = quote! {
#vis fn main() #ret {
futures::executor::block_on( async { async_main().await } );
}
async fn async_main() #ret {
#body
}
}
}
}
result.into()
}
struct Opts {
crate_root: syn::Path,
threads: Option<(u32, Span)>,
}
impl Parse for Opts {
fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
let mut crate_root = None;
let mut threads = None;
loop {
if input.is_empty() {
break;
}
let name_value: syn::MetaNameValue = input.parse()?;
let ident = match name_value.path.get_ident() {
Some(ident) => ident,
None => {
return Err(syn::Error::new_spanned(
name_value.path,
"Must be a single ident",
))
}
};
match &*ident.to_string().to_lowercase() {
"threads" => match &name_value.lit {
syn::Lit::Int(expr) => {
if threads.is_some() {
return Err(syn::Error::new_spanned(
name_value,
"multiple threads argments",
));
}
let num = expr.base10_parse::<std::num::NonZeroU32>()?;
threads = Some((num.get(), expr.span()));
}
_ => {
return Err(syn::Error::new_spanned(
name_value,
"threads argument must be an integer",
))
}
},
"crate" => match &name_value.lit {
syn::Lit::Str(path) => {
if crate_root.is_some() {
return Err(syn::Error::new_spanned(
name_value,
"multiple crate arguments",
));
}
crate_root = Some(path.parse()?);
}
_ => {
return Err(syn::Error::new_spanned(
name_value,
"crate argument must be a string",
))
}
},
name => {
return Err(syn::Error::new_spanned(
name,
"unknown attribute {}, expected `threads` or `crate`",
));
}
}
input.parse::<Option<syn::Token![,]>>()?;
}
Ok(Self {
crate_root: crate_root.unwrap_or_else(|| syn::parse2(quote!(::rustbasic)).unwrap()),
threads,
})
}
}
async fn rustbasic_macro_addlib_temp() {
}
fn rustbasic_macro_addlib() {
futures::executor::block_on( rustbasic_macro_addlib_temp() );
}