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extern crate proc_macro;
use proc_macro::TokenStream;
use syn::parse_macro_input;
use syn::ItemFn;
use quote::format_ident;
use quote::quote;
#[proc_macro_attribute]
pub fn json_op(_args: TokenStream, item: TokenStream) -> TokenStream {
let func = parse_macro_input!(item as ItemFn);
let ItemFn {
attrs,
vis,
sig,
block,
} = func;
let is_async = sig.asyncness.is_some();
let name = &sig.ident;
let impl_name = format_ident!("__impl_{}", name);
let mut impl_sig = sig.clone();
impl_sig.ident = impl_name.clone();
let impl_func = ItemFn {
attrs,
vis,
sig: impl_sig,
block,
};
let body = if is_async {
panic!("async functions are not supported yet");
} else {
quote! {
let res = match #impl_name(val, rest) {
Ok(val) => deno_core::serde_json::json!({
"ok": val
}),
Err(err) => deno_core::serde_json::json!({
"err": err.to_string()
}),
};
deno_core::Op::Sync(deno_core::serde_json::to_vec(&res).unwrap().into_boxed_slice())
}
};
(quote! {
#impl_func
fn #name (_interface: &mut dyn deno_core::plugin_api::Interface, zero_copy: &mut [deno_core::ZeroCopyBuf]) -> Op {
let val = deno_core::serde_json::from_slice(&zero_copy[0]).unwrap();
let rest = &mut zero_copy[1..];
#body
}
}).into()
}