Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-08-03 04:30:10 +01:00
Code Issues Projects Releases Packages Wiki Activity

Bump syn/quote in jstraceable_derive

Browse source
This commit is contained in:
Bastien Orivel 2018-02-12 16:39:23 +01:00
parent c18137b4ea
commit 3670d4d3e5
3 changed files with 20 additions and 35 deletions
Download patch file Download diff file Expand all files Collapse all files

43
components/jstraceable_derive/lib.rs
View file

@ -2,39 +2,24 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate proc_macro;
#[macro_use] extern crate quote;
extern crate syn;
extern crate synstructure;
#[macro_use] extern crate syn;
#[macro_use] extern crate synstructure;
#[proc_macro_derive(JSTraceable)]
pub fn expand_token_stream(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
expand_string(&input.to_string()).parse().unwrap()
}
decl_derive!([JSTraceable] => js_traceable_derive);
fn expand_string(input: &str) -> String {
let mut type_ = syn::parse_macro_input(input).unwrap();
let style = synstructure::BindStyle::Ref.into();
let match_body = synstructure::each_field(&mut type_, &style, |binding| {
Some(quote! { #binding.trace(tracer); })
fn js_traceable_derive(s: synstructure::Structure) -> quote::Tokens {
let match_body = s.each(|binding| {
Some(quote!(#binding.trace(tracer);))
});
let name = &type_.ident;
let (impl_generics, ty_generics, where_clause) = type_.generics.split_for_impl();
let mut where_clause = where_clause.clone();
for param in &type_.generics.ty_params {
where_clause.predicates.push(syn::WherePredicate::BoundPredicate(syn::WhereBoundPredicate {
bound_lifetimes: Vec::new(),
bounded_ty: syn::Ty::Path(None, param.ident.clone().into()),
bounds: vec![syn::TyParamBound::Trait(
syn::PolyTraitRef {
bound_lifetimes: Vec::new(),
trait_ref: syn::parse_path("::dom::bindings::trace::JSTraceable").unwrap(),
},
syn::TraitBoundModifier::None
)],
}))
let ast = s.ast();
let name = ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let mut where_clause = where_clause.unwrap_or(&parse_quote!(where)).clone();
for param in ast.generics.type_params() {
let ident = param.ident;
where_clause.predicates.push(parse_quote!(#ident: ::dom::bindings::trace::JSTraceable))
}
let tokens = quote! {
@ -51,5 +36,5 @@ fn expand_string(input: &str) -> String {
}
};
tokens.to_string()
tokens
}