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denoland-deno/cli/napi/sym/lib.rs
Bartek Iwańczuk 26a64b4edd
refactor(napi): simplify types (#19179)
This commit removes "Error" and "Result" structs from
"ext/napi". In turn all NAPI functions now return "napi_status"
instead of "napi::Result".
2023-05-18 16:17:53 +02:00

36 lines
1,013 B
Rust

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use proc_macro::TokenStream;
use quote::quote;
use serde::Deserialize;
static NAPI_EXPORTS: &str = include_str!("./symbol_exports.json");
#[derive(Deserialize)]
struct SymbolExports {
pub symbols: Vec<String>,
}
#[proc_macro_attribute]
pub fn napi_sym(_attr: TokenStream, item: TokenStream) -> TokenStream {
let func = syn::parse::<syn::ItemFn>(item).expect("expected a function");
let exports: SymbolExports =
serde_json::from_str(NAPI_EXPORTS).expect("failed to parse exports");
let name = &func.sig.ident;
assert!(
exports.symbols.contains(&name.to_string()),
"tools/napi/sym/symbol_exports.json is out of sync!"
);
let block = &func.block;
let inputs = &func.sig.inputs;
let generics = &func.sig.generics;
TokenStream::from(quote! {
// SAFETY: it's an NAPI function.
#[no_mangle]
pub unsafe extern "C" fn #name #generics (#inputs) -> napi_status {
#block
}
})
}