alrulab-macros 0.0.2

Alrulab Macros
Documentation 
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#![allow(unused)]

extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(CloneValued)]
pub fn derive_clone_valued(input: TokenStream) -> TokenStream {
    let ast = parse_macro_input!(input as DeriveInput);
    impl_clone_valued(&ast)
}

fn impl_clone_valued(ast: &DeriveInput) -> TokenStream {
    let name = &ast.ident;
    let gen = quote! {
        impl alrulab_core::value::CloneValued for #name {
            fn clone_to_valued(&self) -> alrulab_core::value::Value<Self>
            where
                Self: Sized
            {
                alrulab_core::value::Value::nok(self.clone())
            }
            fn clone_from_valued(&mut self, value: alrulab_core::value::Value<Self>)
            where
                Self: Sized
            {
                self.clone_from(value.unwrap_or_default());
            }
        }
    };
    gen.into()
}