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use crate::syntax::qualified::QualifiedName;
use proc_macro2::{TokenStream, TokenTree};
use quote::{format_ident, quote, ToTokens};
use syn::ext::IdentExt;
pub(crate) enum Crate {
Cxx,
DollarCrate(TokenTree),
}
impl ToTokens for Crate {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
Crate::Cxx => tokens.extend(quote!(::cxx)),
Crate::DollarCrate(krate) => krate.to_tokens(tokens),
}
}
}
// "folly::File" => `(f, o, l, l, y, (), F, i, l, e)`
pub(crate) fn expand(krate: Crate, arg: QualifiedName) -> TokenStream {
let mut ids = Vec::new();
for word in arg.segments {
if !ids.is_empty() {
ids.push(quote!(()));
}
for ch in word.unraw().to_string().chars() {
ids.push(match ch {
'A'..='Z' | 'a'..='z' => {
let t = format_ident!("{}", ch);
quote!(#krate::#t)
}
'0'..='9' | '_' => {
let t = format_ident!("_{}", ch);
quote!(#krate::#t)
}
_ => quote!([(); #ch as _]),
});
}
}
quote! { (#(#ids,)*) }
}
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