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A node type cannot be defined outside the kernel assembly: five of Entity's abstract members are internal

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Valutazione

Difficoltà
5/5
Tempo stimato
Più di una settimana
Idoneità per principianti
35/100
Tipo di issue
Funzionalità
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
csharp
Ambito
backend-api-design

Direzione di ricerca

Inizia leggendo le cinque definizioni dei membri indicate in Core/Entity/Entity.Definition.cs, Functions/TreeAnalyzer/Sort.Definition.cs, Functions/Evaluation/Evaluation.Definition.cs, Functions/Output/ToSympy.Definition.cs e Functions/Continuous/Solvers/InvertNode.Definition.cs, insieme a Docs/Contributing/Packaging.md e Docs/Contributing/Trimming.md. Esegui EveryNodeSurvivesEveryPipelineTest ed esamina il gate di trimming/AOT. Il lavoro è completo quando sono presenti un contratto documentato, un test della pipeline in un assembly separato e sono stati mantenuti i controlli di reflection e AOT.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Design document
What is wrong

Entity is public abstract partial record, and its constructor is protected, which reads as an
invitation to derive from it. But a subclass in another assembly does not compile. Five of its
abstract members are internal or private protected, so an external type can never satisfy them:

member accessibility where
Priority internal abstract Core/Entity/Entity.Definition.cs:378
SortHashName(SortLevel) private protected abstract Functions/TreeAnalyzer/Sort.Definition.cs:19
IntrinsicCondition private protected abstract Functions/Evaluation/Evaluation.Definition.cs:72
ToSymPy() internal abstract Functions/Output/ToSympy.Definition.cs:13
InvertNode(Entity, Entity) private protected abstract Functions/Continuous/Solvers/InvertNode.Definition.cs:30

Deriving from Entity in a separate assembly fails with CS0534, naming each of those five among
the members it cannot implement. This is not a policy that could be relaxed by an
InternalsVisibleTo: a published extension package cannot be on that list.

Why it matters, and what is behind it

This is the concrete blocker under several roadmap items, and it is not the one they name.

#746 item 56 says the extensibility seam
is #338 — looking a type up so it can be
parsed from a string. That is the second half. The first half is being able to write the type at
all, and today you cannot. The same wall sits under item 53 (groups, rings and fields as
first-class, #440) and under the whole
tier-9 domain-package idea, which assumes a geometry or statistics pack can contribute node types.

It also means one thing the packaging decision cannot decide. Docs/Contributing/Packaging.md
(#746 item 78) works out which capabilities belong in the kernel and which ship separately, and its
answer for domain packages is blocked, not decided — because a package boundary is not what is
in the way here. Moving the LaTeX printer or the SymPy exporter out of the kernel runs into the same
five members from the other side: they are abstract members of Entity, so moving them means either
this contract becoming extensible or a visitor over all 68 node types.

Scope

This is a design decision before it is an implementation, and it should be argued before it is
built. The shape of the question:

  • Which of the five are genuinely part of a node's public contract, and which are engine internals
    that a visitor or a registry should own instead? ToSymPy and SortHashName look like the second
    kind; Priority and IntrinsicCondition look like the first.
  • If a member becomes public or protected, it becomes a compatibility surface — every future
    change to SortLevel, Priority or the InvertNode signature is then breaking. That is the real
    cost and it should be stated before the change, not discovered after.
  • Is the answer instead a sealed node hierarchy plus an explicit extension point — a node kind
    that carries a name and an operation table — so that a domain package contributes data rather than
    a subclass? That keeps Entity closed, which is what makes exhaustive matching and the
    EveryNodeSurvivesEveryPipelineTest reflection sweep work today.
  • Whatever is chosen must be trimming- and NativeAOT-safe: explicit registration, no runtime assembly
    scanning. See #363,
    #552 and
    Docs/Contributing/Trimming.md.
Acceptance criteria
  1. A written decision in Docs/Contributing/, saying what a node type outside the kernel may and may
    not do, and which of the five members are part of the contract.
  2. A test that compiles a node type from a separate assembly and puts it through the pipeline —
    parse is not required, but ToString, Latexize, InnerSimplified, substitution and structural
    equality are. A test that only asserts the type exists proves nothing; this has to build.
  3. EveryNodeSurvivesEveryPipelineTest still passes, and it is stated whether an external node is
    in scope for it.
  4. No new reflection on a hot path, and the trimming/AOT gate stays green.
Dependencies

Independent of everything currently open. It does not depend on
#338 — it is what #338 needs, not the
reverse. It is a prerequisite for #746 items 53 and 56 and for tier 9.

Found while measuring package boundaries for #746 item 78.

Lingua principale
C#
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831
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PR unite (30g)
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