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extern crate proc_macro;
use darling::FromMeta;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, AttributeArgs, DeriveInput, Ident};
#[derive(Debug, FromMeta)]
struct MacroArgs {
#[darling(default)]
serialization: Option<Ident>,
}
#[proc_macro_attribute]
pub fn track(_attr: TokenStream, unparsed_input: TokenStream) -> TokenStream {
let attr_args = parse_macro_input!(_attr as AttributeArgs);
let input: DeriveInput = parse_macro_input!(unparsed_input as syn::DeriveInput);
let _args = match MacroArgs::from_list(&attr_args) {
Ok(v) => v,
Err(e) => {
return proc_macro::TokenStream::from(e.write_errors());
}
};
let serialization = if let Some(ser) = _args.serialization {
ser
} else {
Ident::from_string("Bincode").unwrap()
};
let name = input.ident.clone();
let implementation = quote! {
#[derive(Clone, SerdeDiff, Serialize, Deserialize)]
#input
impl Trackable<#name, #serialization> for #name {
fn track<'notifier, I: Identifier>(&mut self, sender: &'notifier Sender<ModificationEvent<I>>, identifier: I) -> Tracker<'_, 'notifier, #name, #serialization, I> {
Tracker::new(self, sender, #serialization, identifier)
}
}
impl TrackableMarker for #name { }
};
proc_macro::TokenStream::from(implementation)
}