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Commit Graph

1 Commits (c3581049007ac0109a55cabe12315b36b1cf1c64)

Author	SHA1	Message	Date
Alessio Giacobbe	fde9e3a9d8	fix(translator): covariant typed class constants and interface constant contracts (#58) --skip-tests ... * fix(translator): make typed class-constant overrides covariant checkConstantOverride() required exact type equality between a child constant and the parent's declared type, rejecting valid PHP 8.3 programs: class constant types are covariant, so a child may narrow (parent `const int|string X` overridden by `const int X`, or `?int` by `int`) but never widen or move to an unrelated type (Zend: "Type of B::X must be compatible with A::X of type int"). Composite declared types (unions, nullables) were also collapsed to a single variant type at parse time, making them unrepresentable in the check. ConstantDef now records the accepted-types DNF of its declared type (built by the existing buildTypeCheckFromNode machinery in a parseClassConstDef override, while the declaration's name-resolution context is still active), and the override check reuses the DNF clause-subtyping used for covariant returns. Untyped parent constants remain unchecked, and a typed parent still requires a typed child. * fix(translator): validate interface constant contracts Interface constants were never validated: checkInterfaceImplementation() had no constants loop and checkConstantOverride() only walks the class extends chain. Incompatible retypings, final-constant overrides, narrowed visibility and ambiguous multi-interface inheritance were all accepted (all fatal in Zend 8.4). Model Zend's constants-table merge (zend_do_inheritance + do_inherit_constant_check): a class-like's effective table is built from the parent class's table (private constants are not inherited), its own declarations, then its interfaces, each entry keeping the ORIGINAL declaring class/interface. When a same-name constant arrives from a different declaration: - a FINAL inherited constant cannot be overridden — "C::X cannot override final constant I::X" — including through an ancestor class that implemented the interface (the origin travels with the entry); - two different declarations are ambiguous unless the type declares the constant itself — "Class C inherits both I1::X and I2::X, which is ambiguous" (a diamond of one declaration is fine); - an override of an interface constant must stay public — "Access level to C::X must be public (as in interface I)"; - a typed interface constant requires a typed, covariant override; an untyped one may be redefined freely. The same validation runs for interfaces extending interfaces and for enums implementing interfaces. Enum cases live in a separate table in Zend and never conflict with inherited constants.	3 days ago