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#![allow(clippy::never_loop)]
extern crate proc_macro;
mod util;
mod ast;
mod generator;
use proc_macro::TokenStream;
/// This turns regular rust function into N-API compatible native module
///
/// For example; given rust following here
/// ```ignore
/// fn sum(first: i32, second: i32) -> i32 {
/// return first+second
/// }
/// ```
///
/// into N-API module
/// ```ignore
/// #[no_mangle]
/// pub extern "C" fn n_sum(env: napi_env, cb_info: napi_callback_info) -> napi_value {
/// fn sum(first: i32, second: i32) -> i32 {
/// return first+second
/// }
/// let js_env = JsEnv::new(env);
/// let js_cb = result_to_napi!(js_env.get_cb_info(cb_info, 2),&js_env);
/// let first = result_to_napi!(js_cb.get_value::<i32>(0),&js_env);
/// let second = result_to_napi!(js_cb.get_value::<i32>(0),&js_env);
/// sum(msg).into_js(&js_env)
/// }
/// ```
#[proc_macro_attribute]
pub fn node_bindgen(args: TokenStream, item: TokenStream) -> TokenStream {
use syn::AttributeArgs;
use ast::FunctionAttributes;
use ast::NodeItem;
use generator::generate_function;
use generator::generate_class;
use generator::generate_datatype;
let attribute_args = syn::parse_macro_input!(args as AttributeArgs);
let attribute: FunctionAttributes = match FunctionAttributes::from_ast(attribute_args) {
Ok(attr) => attr,
Err(err) => return err.to_compile_error().into(),
};
let parsed_item = syn::parse_macro_input!(item as NodeItem);
let out_express = match parsed_item {
NodeItem::Function(fn_item) => generate_function(fn_item, attribute),
NodeItem::Impl(impl_item) => generate_class(impl_item),
NodeItem::Derive(struct_item) => generate_datatype(struct_item),
};
// used for debugging, if error occurs println do not work so should uncomment express
// println!("{}", out_express);
// let out_express = quote::quote! {};
out_express.into()
}