nodex-api 0.2.4

rust binding to node_api.h
Documentation 
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// common macros
#[macro_export]
macro_rules! napi_module {
    ($init:ident) => {
        #[no_mangle]
        pub unsafe extern "C" fn napi_register_module_v1(
            env: $crate::api::napi_env,
            exports: $crate::api::napi_value,
        ) -> $crate::api::napi_value {
            use $crate::value::NapiValueT;
            let env = $crate::env::NapiEnv::from_raw(env);
            let exports = $crate::value::JsObject::from_raw(env, exports);

            // TODO: deal with exception
            match std::panic::catch_unwind(move || $init(env, exports)) {
                Ok(Ok(_)) => {}
                Ok(Err(e)) => {
                    env.throw_error(format!("napi: {:?}", e)).unwrap();
                }
                Err(e) => {
                    env.throw_error(format!("panic: {:?}", e)).unwrap();
                }
            }

            exports.raw()
        }
    };
}

#[macro_export]
macro_rules! napi_call {
    // [out] result: napi function which has output
    (=$napi:ident, $($args:expr),+ $(,)?) => {
        unsafe {
            let mut result = std::mem::MaybeUninit::uninit();
            let status = $crate::api::$napi($($args),+, result.as_mut_ptr());
            if status.err() {
                return Err(status);
            }
            result.assume_init()
        }
    };

    (?$napi:ident, $($args:expr),+ $(,)?) => {
        unsafe {
            let mut result = std::mem::MaybeUninit::uninit();
            let status = $crate::api::$napi($($args),+, result.as_mut_ptr());
            (status, result.assume_init())
        }
    };

    ($napi:ident, $($args:expr),+ $(,)?) => {
        unsafe {
            let status = $crate::api::$napi($($args),+);
            if status.err() {
                return Err(status);
            } else {
                NapiResult::Ok(())
            }
        }
    }
}

#[macro_export]
macro_rules! napi_guard {
    ($version:expr) => {
        assert!(
            $version >= $crate::napi_version_guard(),
            "Oops, your node(napi {}) is too old to support napi >= {}",
            $version,
            $crate::napi_version_guard(),
        );
    };
}

#[macro_export]
macro_rules! napi_from_raw {
    ($T:ident) => {
        fn from_raw(env: $crate::env::NapiEnv, raw: $crate::api::napi_value) -> $T {
            $T($crate::value::JsValue(env, raw))
        }
    };
}

#[macro_export]
macro_rules! napi_get_value {
    ($T:ident) => {
        fn value(&self) -> $crate::value::JsValue {
            self.0
        }
    };
}

#[macro_export]
macro_rules! napi_value_t {
    ($T:ident) => {
        impl $crate::value::NapiValueT for $T {
            napi_from_raw!($T);
            napi_get_value!($T);
        }
    };
}

#[macro_export]
macro_rules! napi_s {
    ($s:expr) => {
        std::ffi::CString::new($s).map_err(|_| $crate::NapiStatus::StringExpected)
    };
}

#[macro_export]
macro_rules! napi_r {
    ($env:ident, =$s:expr) => {
        match $s {
            Ok(result) => result.raw(),
            Err(err) => {
                $env.throw_error(format!("{}", err)).unwrap();
                $env.undefined().unwrap().raw()
            }
        }
    };

    ($env:ident, $s:expr) => {
        match $s {
            Ok(result) => $env.undefined().unwrap().raw(),
            Err(err) => {
                $env.throw_error(format!("{}", err)).unwrap();
                $env.undefined().unwrap().raw()
            }
        }
    };
}

#[macro_export]
macro_rules! napi_as {
    ($self:ident, $T:ty, $err:expr) => {{
        let casted = unsafe { $self.cast::<$T>() };
        if $self.check()? {
            Ok(casted)
        } else {
            Err($err)
        }
    }};
}

#[macro_export]
macro_rules! napi_is {
    ($self:ident, $T:ty) => {
        unsafe { $self.cast::<$T>() }.check()
    };
}