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// Copyright (c) 2026 Cloudflare, Inc.
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// Licensed under the Apache 2.0 license found in the LICENSE file or at:
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//     https://opensource.org/licenses/Apache-2.0
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//! Trace code generation for `#[jsg_resource]` structs.
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//!
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//! We intentionally do not inspect field types here. Every field is assumed to
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//! implement `jsg::Traced`, and the generated body simply delegates to
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//! `jsg::Traced::trace(&self.field, visitor)` for each named field.
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/// Generates one trace delegation statement per named field.
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/// All fields are traced for safety by default, based on enforcing they implement
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/// the `Traced` trait, which all `GarbageCollected` types implement, and all non-GC
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/// types implement as a no-op.
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pub fn generate_trace_statements(
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    fields: &syn::punctuated::Punctuated<syn::Field, syn::token::Comma>,
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) -> Vec<quote::__private::TokenStream> {
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    use quote::quote;
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    fields
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        .iter()
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        .filter_map(|field| {
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            let field_name = field.ident.as_ref()?;
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            Some(quote! {
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                jsg::Traced::trace(&self.#field_name, visitor);
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            })
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        })
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        .collect()
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}