[Feature]: InvocationExpression::evaluate — model-level expression evaluation engine #365

Description

InvocationExpressionExtensions.ComputeRedefinedEvaluateOperation(this IInvocationExpression, IElement target)
in SysML2.NET/Extend/InvocationExpressionExtensions.cs:83 is a NotSupportedException stub. It has
no OCL derivation — KerML 1.0 §8.4.4.9.8 delegates it to execution semantics:

An InvocationExpression evaluates to an application of its function to argument values
corresponding to the results of evaluating each of the argument Expressions of the
InvocationExpression.

What is required

A model-level expression evaluation engine, following the pilot implementation
(org.omg.sysml.expressions → ModelLevelExpressionEvaluator).

1. Library-function resolution. ComputeResolveGlobalOperation
   (SysML2.NET/Extend/NamespaceExtensions.cs:528) walks up owningNamespace only, so
   function.qualifiedName resolves only when the Kernel Functions Library sits in the same
   containment tree as the user model. Resources/sysml.library.kpar ships but is loaded nowhere
   outside SysML2.NET.Kpar.Tests. Decide: SDK-side library registry, or caller-supplied library.
2. Dispatch registry + evaluation context. Evaluate(IElement target) carries no parameter
   binding; collect / select re-enter evaluation once per element with a bound body parameter.
3. Literal factory + numeric coercion. evaluate constructs result elements (LiteralInteger,
   LiteralRational, LiteralBoolean, LiteralString, LiteralInfinity) and promotes
   Natural → Integer → Rational → Real.
4. The 35 library function bodies, in four groups:
   • classification — istype, hastype, @, @@, as, meta, ==, !=, ===, !==
   • boolean / control — and, or, xor, not, implies, if, ?? (must not eagerly
     evaluate all arguments, so these cannot share the generic dispatch path)
   • numeric — +, -, *, /, %, ^, <, >, <=, >=, ..
   • sequence — ,, #, ., collect, select
5. Fallback for a non-library function: evaluate the invoked type's result expression.

Blocked

meta and @@ need reflective metaclass features (KerML 1.0 §9.2.17) — i.e. the two remaining
Extend stubs MetadataAccessExpressionExtensions.ComputeMetaclassFeatureOperation
(SysML2.NET/Extend/MetadataAccessExpressionExtensions.cs:163) and
MetadataFeatureExtensions.ComputeSyntaxElementOperation
(SysML2.NET/Extend/MetadataFeatureExtensions.cs:208). Both require a MOF reflective registry that
does not exist in the SDK.

Depends on

#364 — dispatch keys on the same library-function set.

Checklist

• Library-function resolution strategy
• Dispatch registry + evaluation context
• Literal factory + numeric coercion helpers
• Classification functions
• Boolean / control functions
• Numeric functions
• Sequence / collection functions
• Non-library-function fallback
• List<IElement> ComputeRedefinedEvaluateOperation(this IInvocationExpression, IElement)

System Configuration

• SysML2.NET version: 0.19.0
• Source file: SysML2.NET/Extend/InvocationExpressionExtensions.cs