nj_derive/
lib.rs

1#![allow(clippy::never_loop)]
2extern crate proc_macro;
3
4mod util;
5mod ast;
6mod generator;
7
8use proc_macro::TokenStream;
9
10/// This turns regular rust function into N-API compatible native module
11///
12/// For example; given rust following here
13/// ```ignore
14/// fn sum(first: i32, second: i32) -> i32 {
15///      return first+second
16/// }
17/// ```
18///
19/// into N-API module
20/// ```ignore
21/// #[no_mangle]
22/// pub extern "C" fn n_sum(env: napi_env, cb_info: napi_callback_info) -> napi_value {
23///     fn sum(first: i32, second: i32) -> i32 {
24///       return first+second
25///     }
26///     let js_env = JsEnv::new(env);
27///     let js_cb = result_to_napi!(js_env.get_cb_info(cb_info, 2),&js_env);
28///     let first = result_to_napi!(js_cb.get_value::<i32>(0),&js_env);
29///     let second = result_to_napi!(js_cb.get_value::<i32>(0),&js_env);
30///     sum(msg).into_js(&js_env)
31/// }
32/// ```
33#[proc_macro_attribute]
34pub fn node_bindgen(args: TokenStream, item: TokenStream) -> TokenStream {
35    use syn::AttributeArgs;
36
37    use ast::FunctionAttributes;
38    use ast::NodeItem;
39    use generator::generate_function;
40    use generator::generate_class;
41    use generator::generate_datatype;
42
43    let attribute_args = syn::parse_macro_input!(args as AttributeArgs);
44
45    let attribute: FunctionAttributes = match FunctionAttributes::from_ast(attribute_args) {
46        Ok(attr) => attr,
47        Err(err) => return err.to_compile_error().into(),
48    };
49
50    let parsed_item = syn::parse_macro_input!(item as NodeItem);
51
52    let out_express = match parsed_item {
53        NodeItem::Function(fn_item) => generate_function(fn_item, attribute),
54        NodeItem::Impl(impl_item) => generate_class(impl_item),
55        NodeItem::Derive(struct_item) => generate_datatype(struct_item),
56    };
57
58    // used for debugging, if error occurs println do not work so should uncomment express
59    // println!("{}", out_express);
60    // let out_express = quote::quote! {};
61
62    out_express.into()
63}
nj_derive/lib.rs

nj_derive/
lib.rs
