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41 lines
1.4 KiB
Rust
41 lines
1.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#[macro_use]
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extern crate syn;
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#[macro_use]
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extern crate synstructure;
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decl_derive!([JSTraceable] => js_traceable_derive);
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fn js_traceable_derive(s: synstructure::Structure) -> proc_macro2::TokenStream {
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let match_body = s.each(|binding| Some(quote!(#binding.trace(tracer);)));
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let ast = s.ast();
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let name = &ast.ident;
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let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
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let mut where_clause = where_clause.unwrap_or(&parse_quote!(where)).clone();
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for param in ast.generics.type_params() {
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let ident = ¶m.ident;
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where_clause
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.predicates
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.push(parse_quote!(#ident: crate::dom::bindings::trace::JSTraceable))
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}
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let tokens = quote! {
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#[allow(unsafe_code)]
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unsafe impl #impl_generics crate::dom::bindings::trace::JSTraceable for #name #ty_generics #where_clause {
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#[inline]
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#[allow(unused_variables, unused_imports)]
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unsafe fn trace(&self, tracer: *mut js::jsapi::JSTracer) {
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use crate::dom::bindings::trace::JSTraceable;
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match *self {
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#match_body
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}
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}
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}
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};
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tokens
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}
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