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Add the folded subject to LayoutMeta and derive reducer depth from it

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This commit is contained in:
Dennis Kobert
2026-08-19 21:43:14 +00:00
parent 58a65c69e9
commit 7ffc9b9e3b
4 changed files with 36 additions and 1 deletions
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14
node-graph/node-macro/src/codegen/ir.rs
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@@ -236,6 +236,10 @@ pub(crate) fn layout_meta_tokens(node: &Node, element_spec: TokenStream2, core_t
quote!((<#marker as #core_types::attribute::Attribute>::NAME, #level))
});
let level_delta = level_delta(node);
let folded = match folded_subject(node) {
Some((index, levels)) => quote!(::core::option::Option::Some((#index, #levels))),
None => quote!(::core::option::Option::None),
};
quote! {
#core_types::record::LayoutMeta {
sources: ::std::vec![#(#sources),*],
@@ -244,10 +248,20 @@ pub(crate) fn layout_meta_tokens(node: &Node, element_spec: TokenStream2, core_t
writes: ::std::vec![#(#writes),*],
removes: ::std::vec![#(#removes),*],
level_delta: #level_delta,
folded: #folded,
}
}
}
/// The materialized subject a node folds, as `(input, levels)`.
pub(crate) fn folded_subject(node: &Node) -> Option<(u8, u8)> {
node.inputs
.iter()
.enumerate()
.find(|(index, input)| input.subject && materialized_levels(node, *index) > 0)
.map(|(index, _)| (index as u8, materialized_levels(node, index)))
}
fn field_writes(attrs: &[LevelAttr], core_types: &TokenStream2) -> Vec<TokenStream2> {
attrs
.iter()