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40 lines
1.4 KiB
Rust
40 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 http://mozilla.org/MPL/2.0/. */
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#[macro_use] extern crate quote;
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#[macro_use] extern crate syn;
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#[macro_use] extern crate synstructure;
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decl_derive!([JSTraceable] => js_traceable_derive);
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fn js_traceable_derive(s: synstructure::Structure) -> quote::Tokens {
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let match_body = s.each(|binding| {
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Some(quote!(#binding.trace(tracer);))
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});
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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 = param.ident;
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where_clause.predicates.push(parse_quote!(#ident: ::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 ::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 ::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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