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Support lazy record carriers so a creator can read and rewrite attrs per copy

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This commit is contained in:
Dennis Kobert
2026-08-16 17:13:19 +00:00
parent bef58bf395
commit e423dd96de
6 changed files with 234 additions and 22 deletions
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8
node-graph/node-macro/src/codegen/ir.rs
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@@ -76,7 +76,9 @@ fn inputs(parsed: &ParsedNodeFn, fields: &[&ParsedField], generics: &[Ident]) ->
fn subject(index: usize, field: &ParsedField, carrier_subject: bool, routing: Option<&RoutingIo>) -> bool {
match &field.ty {
ParsedFieldType::Node(NodeParsedField { output_type, .. }) => is_record_value(output_type) || routing.is_some_and(|routing| bare_ident(output_type) == Some(&routing.generic)),
ParsedFieldType::Node(NodeParsedField { output_type, .. }) => {
is_record_value(output_type) || routing.is_some_and(|routing| bare_ident(output_type) == Some(&routing.generic)) || (index == 0 && carrier_subject)
}
ParsedFieldType::Regular(RegularParsedField { ty, .. }) => routing.is_some_and(|routing| bare_ident(ty) == Some(&routing.generic)) || (index == 0 && carrier_subject),
}
}
@@ -272,6 +274,7 @@ pub(crate) enum LazyBinding {
Element,
Plain,
DeriveRouting,
DeriveCarrier,
OpaqueRecord,
}
@@ -345,6 +348,8 @@ pub(crate) fn lazy_binding(node: &Node, index: usize) -> LazyBinding {
let kind = node_kind(node);
if node.derives && matches!(kind, NodeKind::Routing) && input.subject {
LazyBinding::DeriveRouting
} else if node.derives && matches!(kind, NodeKind::RecordIo) && input.subject {
LazyBinding::DeriveCarrier
} else if matches!(kind, NodeKind::Flip) {
LazyBinding::Element
} else if matches!(input.shape.element, Element::Opaque) {
@@ -670,6 +675,7 @@ mod tests {
},
ParsedFieldType::Node(_) => match (lazy_binding(node, index), raw) {
(LazyBinding::DeriveRouting, _) => "derive-routing",
(LazyBinding::DeriveCarrier, _) => "derive-carrier",
(LazyBinding::OpaqueRecord, _) => "opaque-record",
(LazyBinding::Element, true) => "flip-raw",
(LazyBinding::Element, false) => "flip-lazy",