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use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::{
format_ident,
quote,
};
use syn::{
parse_macro_input,
Data,
DeriveInput,
Fields,
Generics,
Ident,
};
#[proc_macro_derive(Editable)]
pub fn derive_editable(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
expand_derive_editable(&input).into()
}
fn expand_derive_editable(input: &DeriveInput) -> TokenStream2 {
match &input.data {
Data::Struct(data) => {
implement_struct_editable(&input.ident, &input.generics, &data.fields)
}
_ => unimplemented!("Enum not supported"),
}
}
fn implement_struct_editable(ident: &Ident, generics: &Generics, fields: &Fields) -> TokenStream2 {
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
let path = format_ident!("newport_editor");
let mut tokens = Vec::new();
match fields {
Fields::Named(fields) => {
for field in fields.named.iter() {
match &field.ident {
Some(ident) => {
tokens.push(quote! {
#path::Editable::edit(&mut self.#ident, stringify!(#ident), ui);
});
}
None => {}
}
}
}
_ => panic!("Named are only supported"),
}
quote! {
impl #impl_generics #path::Editable for #ident #ty_generics #where_clause {
fn edit(&mut self, name: &str, builder: &mut #path::Builder) {
}
}
}
}