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feat(ops): #[op(unstable)] (#14124)

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Aaron O'Mullan 2022-04-02 00:09:21 +02:00 • committed by GitHub
parent 1535fdd949
commit 25b6b2ed66
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3 changed files with 63 additions and 1 deletions
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28
ops/lib.rs
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@ -34,8 +34,33 @@ fn core_import() -> TokenStream2 {
}
}
#[derive(Debug)]
struct MacroArgs {
is_unstable: bool,
}
impl syn::parse::Parse for MacroArgs {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let vars =
syn::punctuated::Punctuated::<Ident, syn::Token![,]>::parse_terminated(
input,
)?;
let vars: Vec<_> = vars.iter().map(Ident::to_string).collect();
let vars: Vec<_> = vars.iter().map(String::as_str).collect();
match vars[..] {
["unstable"] => Ok(Self { is_unstable: true }),
[] => Ok(Self { is_unstable: false }),
_ => Err(syn::Error::new(
input.span(),
"Ops expect #[op] or #[op(unstable)]",
)),
}
}
}
#[proc_macro_attribute]
pub fn op(_attr: TokenStream, item: TokenStream) -> TokenStream {
pub fn op(attr: TokenStream, item: TokenStream) -> TokenStream {
let MacroArgs { is_unstable } = syn::parse_macro_input!(attr as MacroArgs);
let func = syn::parse::<syn::ItemFn>(item).expect("expected a function");
let name = &func.sig.ident;
let generics = &func.sig.generics;
@ -85,6 +110,7 @@ pub fn op(_attr: TokenStream, item: TokenStream) -> TokenStream {
v8_fn_ptr: Self::v8_fn_ptr::<#type_params>(),
enabled: true,
is_async: #is_async,
is_unstable: #is_unstable,
}
}