cxxbridge_macro/
type_id.rs

1use crate::syntax::qualified::QualifiedName;
2use proc_macro2::{TokenStream, TokenTree};
3use quote::{format_ident, quote, ToTokens};
4use syn::ext::IdentExt;
5
6pub(crate) enum Crate {
7    Cxx,
8    DollarCrate(TokenTree),
9}
10
11impl ToTokens for Crate {
12    fn to_tokens(&self, tokens: &mut TokenStream) {
13        match self {
14            Crate::Cxx => tokens.extend(quote!(::cxx)),
15            Crate::DollarCrate(krate) => krate.to_tokens(tokens),
16        }
17    }
18}
19
20// "folly::File" => `(f, o, l, l, y, (), F, i, l, e)`
21pub(crate) fn expand(krate: Crate, arg: QualifiedName) -> TokenStream {
22    let mut ids = Vec::new();
23
24    for word in arg.segments {
25        if !ids.is_empty() {
26            ids.push(quote!(()));
27        }
28        for ch in word.unraw().to_string().chars() {
29            ids.push(match ch {
30                'A'..='Z' | 'a'..='z' => {
31                    let t = format_ident!("{}", ch);
32                    quote!(#krate::#t)
33                }
34                '0'..='9' | '_' => {
35                    let t = format_ident!("_{}", ch);
36                    quote!(#krate::#t)
37                }
38                _ => quote!([(); #ch as _]),
39            });
40        }
41    }
42
43    quote! { (#(#ids,)*) }
44}
cxxbridge_macro/type_id.rs

cxxbridge_macro/
type_id.rs
