napi_derive_backend/codegen/
const.rs

1use proc_macro2::{Ident, Literal, TokenStream};
2use quote::ToTokens;
3
4use crate::{codegen::js_mod_to_token_stream, BindgenResult, NapiConst, TryToTokens};
5
6impl TryToTokens for NapiConst {
7  fn try_to_tokens(&self, tokens: &mut TokenStream) -> BindgenResult<()> {
8    let register = self.gen_module_register();
9    (quote! {
10      #register
11    })
12    .to_tokens(tokens);
13
14    Ok(())
15  }
16}
17
18impl NapiConst {
19  fn gen_module_register(&self) -> TokenStream {
20    if cfg!(test) {
21      return quote! {};
22    }
23
24    let name_ident = &self.name;
25    let js_name_lit = Literal::string(&format!("{}\0", self.name));
26    let register_name = &self.register_name;
27    let type_name = &self.type_name;
28    let cb_name = Ident::new(
29      &format!("__register__const__{register_name}_callback__"),
30      self.name.span(),
31    );
32    let js_mod_ident = js_mod_to_token_stream(self.js_mod.as_ref());
33
34    quote! {
35      #[allow(non_snake_case)]
36      #[allow(clippy::all)]
37      unsafe fn #cb_name(env: napi::sys::napi_env) -> napi::Result<napi::sys::napi_value> {
38        <#type_name as napi::bindgen_prelude::ToNapiValue>::to_napi_value(env, #name_ident)
39      }
40      #[allow(non_snake_case)]
41      #[allow(clippy::all)]
42      #[cfg(all(not(test), not(target_family = "wasm")))]
43      #[napi::ctor::ctor(crate_path=::napi::ctor)]
44      fn #register_name() {
45        napi::bindgen_prelude::register_module_export(#js_mod_ident, #js_name_lit, #cb_name);
46      }
47
48      #[allow(non_snake_case)]
49      #[allow(clippy::all)]
50      #[cfg(all(not(test), target_family = "wasm"))]
51      #[no_mangle]
52      unsafe extern "C" fn #register_name() {
53        napi::bindgen_prelude::register_module_export(#js_mod_ident, #js_name_lit, #cb_name);
54      }
55    }
56  }
57}
napi_derive_backend/codegen/const.rs

napi_derive_backend/codegen/
const.rs
