use proc_macro2::{Ident, TokenStream};
use quote::format_ident;
use syn;
use try;
pub fn wrap_in_const(
serde_path: Option<&syn::Path>,
trait_: &str,
ty: &Ident,
code: TokenStream,
) -> TokenStream {
let try_replacement = try::replacement();
let dummy_const = if cfg!(no_underscore_consts) {
format_ident!("_IMPL_{}_FOR_{}", trait_, unraw(ty))
} else {
format_ident!("_")
};
let use_serde = match serde_path {
Some(path) => quote! {
use #path as _serde;
},
None => quote! {
#[allow(unused_extern_crates, clippy::useless_attribute)]
extern crate serde as _serde;
},
};
quote! {
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const #dummy_const: () = {
#use_serde
#try_replacement
#code
};
}
}
fn unraw(ident: &Ident) -> String {
ident.to_string().trim_start_matches("r#").to_owned()
}