luau/tests/Subtyping.test.cpp

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/TypePath.h"
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#include "doctest.h"
#include "Fixture.h"
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#include "RegisterCallbacks.h"
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#include "Luau/Normalize.h"
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#include "Luau/Subtyping.h"
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#include "Luau/Type.h"
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#include "Luau/TypePack.h"
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using namespace Luau;
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namespace Luau
{
std::ostream& operator<<(std::ostream& lhs, const SubtypingReasoning& reasoning)
{
return lhs << toString(reasoning.subPath) << " </: " << toString(reasoning.superPath);
}
}; // namespace Luau
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struct SubtypeFixture : Fixture
{
TypeArena arena;
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InternalErrorReporter iceReporter;
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UnifierSharedState sharedState{&ice};
Normalizer normalizer{&arena, builtinTypes, NotNull{&sharedState}};
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ScopePtr rootScope{new Scope(builtinTypes->emptyTypePack)};
ScopePtr moduleScope{new Scope(rootScope)};
Subtyping subtyping = mkSubtyping(rootScope);
Subtyping mkSubtyping(const ScopePtr& scope)
{
return Subtyping{builtinTypes, NotNull{&arena}, NotNull{&normalizer}, NotNull{&iceReporter}, NotNull{scope.get()}};
}
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TypePackId pack(std::initializer_list<TypeId> tys)
{
return arena.addTypePack(tys);
}
TypePackId pack(std::initializer_list<TypeId> tys, TypePackVariant tail)
{
return arena.addTypePack(tys, arena.addTypePack(std::move(tail)));
}
TypeId fn(std::initializer_list<TypeId> args, std::initializer_list<TypeId> rets)
{
return arena.addType(FunctionType{pack(args), pack(rets)});
}
TypeId fn(std::initializer_list<TypeId> argHead, TypePackVariant argTail, std::initializer_list<TypeId> rets)
{
return arena.addType(FunctionType{pack(argHead, std::move(argTail)), pack(rets)});
}
TypeId fn(std::initializer_list<TypeId> args, std::initializer_list<TypeId> retHead, TypePackVariant retTail)
{
return arena.addType(FunctionType{pack(args), pack(retHead, std::move(retTail))});
}
TypeId fn(std::initializer_list<TypeId> argHead, TypePackVariant argTail, std::initializer_list<TypeId> retHead, TypePackVariant retTail)
{
return arena.addType(FunctionType{pack(argHead, std::move(argTail)), pack(retHead, std::move(retTail))});
}
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TypeId tbl(TableType::Props&& props)
{
return arena.addType(TableType{std::move(props), std::nullopt, {}, TableState::Sealed});
}
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TypeId idx(TypeId keyTy, TypeId valueTy)
{
return arena.addType(TableType{{}, TableIndexer{keyTy, valueTy}, {}, TableState::Sealed});
}
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// `&`
TypeId meet(TypeId a, TypeId b)
{
return arena.addType(IntersectionType{{a, b}});
}
// `|`
TypeId join(TypeId a, TypeId b)
{
return arena.addType(UnionType{{a, b}});
}
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// `~`
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TypeId negate(TypeId ty)
{
return arena.addType(NegationType{ty});
}
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// "literal"
TypeId str(const char* literal)
{
return arena.addType(SingletonType{StringSingleton{literal}});
}
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TypeId cls(const std::string& name, std::optional<TypeId> parent = std::nullopt)
{
return arena.addType(ClassType{name, {}, parent.value_or(builtinTypes->classType), {}, {}, nullptr, ""});
}
TypeId cls(const std::string& name, ClassType::Props&& props)
{
TypeId ty = cls(name);
getMutable<ClassType>(ty)->props = std::move(props);
return ty;
}
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TypeId opt(TypeId ty)
{
return join(ty, builtinTypes->nilType);
}
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TypeId cyclicTable(std::function<void(TypeId, TableType*)>&& cb)
{
TypeId res = arena.addType(GenericType{});
TableType tt{};
cb(res, &tt);
emplaceType<TableType>(asMutable(res), std::move(tt));
return res;
}
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TypeId meta(TableType::Props&& metaProps, TableType::Props&& tableProps = {})
{
return arena.addType(MetatableType{tbl(std::move(tableProps)), tbl(std::move(metaProps))});
}
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TypeId genericT = arena.addType(GenericType{moduleScope.get(), "T"});
TypeId genericU = arena.addType(GenericType{moduleScope.get(), "U"});
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TypePackId genericAs = arena.addTypePack(GenericTypePack{"A"});
TypePackId genericBs = arena.addTypePack(GenericTypePack{"B"});
TypePackId genericCs = arena.addTypePack(GenericTypePack{"C"});
SubtypingResult isSubtype(TypeId subTy, TypeId superTy)
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{
return subtyping.isSubtype(subTy, superTy);
}
TypeId helloType = arena.addType(SingletonType{StringSingleton{"hello"}});
TypeId helloType2 = arena.addType(SingletonType{StringSingleton{"hello"}});
TypeId worldType = arena.addType(SingletonType{StringSingleton{"world"}});
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TypeId aType = arena.addType(SingletonType{StringSingleton{"a"}});
TypeId bType = arena.addType(SingletonType{StringSingleton{"b"}});
TypeId trueSingleton = arena.addType(SingletonType{BooleanSingleton{true}});
TypeId falseSingleton = arena.addType(SingletonType{BooleanSingleton{false}});
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TypeId helloOrWorldType = join(helloType, worldType);
TypeId trueOrFalseType = join(builtinTypes->trueType, builtinTypes->falseType);
TypeId helloAndWorldType = meet(helloType, worldType);
TypeId booleanAndTrueType = meet(builtinTypes->booleanType, builtinTypes->trueType);
/**
* class
* \- Root
* |- Child
* | |-GrandchildOne
* | \-GrandchildTwo
* \- AnotherChild
* |- AnotherGrandchildOne
* \- AnotherGrandchildTwo
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*/
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TypeId rootClass = cls("Root");
TypeId childClass = cls("Child", rootClass);
TypeId grandchildOneClass = cls("GrandchildOne", childClass);
TypeId grandchildTwoClass = cls("GrandchildTwo", childClass);
TypeId anotherChildClass = cls("AnotherChild", rootClass);
TypeId anotherGrandchildOneClass = cls("AnotherGrandchildOne", anotherChildClass);
TypeId anotherGrandchildTwoClass = cls("AnotherGrandchildTwo", anotherChildClass);
TypeId vec2Class = cls("Vec2", {
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{"X", builtinTypes->numberType},
{"Y", builtinTypes->numberType},
});
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// "hello" | "hello"
TypeId helloOrHelloType = arena.addType(UnionType{{helloType, helloType}});
// () -> ()
const TypeId nothingToNothingType = fn({}, {});
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// (number) -> string
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const TypeId numberToStringType = fn({builtinTypes->numberType}, {builtinTypes->stringType});
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// (unknown) -> string
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const TypeId unknownToStringType = fn({builtinTypes->unknownType}, {builtinTypes->stringType});
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// (number) -> ()
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const TypeId numberToNothingType = fn({builtinTypes->numberType}, {});
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// () -> number
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const TypeId nothingToNumberType = fn({}, {builtinTypes->numberType});
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// (number) -> number
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const TypeId numberToNumberType = fn({builtinTypes->numberType}, {builtinTypes->numberType});
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// (number) -> unknown
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const TypeId numberToUnknownType = fn({builtinTypes->numberType}, {builtinTypes->unknownType});
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// (number) -> (string, string)
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const TypeId numberToTwoStringsType = fn({builtinTypes->numberType}, {builtinTypes->stringType, builtinTypes->stringType});
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// (number) -> (string, unknown)
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const TypeId numberToStringAndUnknownType = fn({builtinTypes->numberType}, {builtinTypes->stringType, builtinTypes->unknownType});
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// (number, number) -> string
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const TypeId numberNumberToStringType = fn({builtinTypes->numberType, builtinTypes->numberType}, {builtinTypes->stringType});
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// (unknown, number) -> string
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const TypeId unknownNumberToStringType = fn({builtinTypes->unknownType, builtinTypes->numberType}, {builtinTypes->stringType});
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// (number, string) -> string
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const TypeId numberAndStringToStringType = fn({builtinTypes->numberType, builtinTypes->stringType}, {builtinTypes->stringType});
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// (number, ...string) -> string
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const TypeId numberAndStringsToStringType =
fn({builtinTypes->numberType}, VariadicTypePack{builtinTypes->stringType}, {builtinTypes->stringType});
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// (number, ...string?) -> string
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const TypeId numberAndOptionalStringsToStringType =
fn({builtinTypes->numberType}, VariadicTypePack{builtinTypes->optionalStringType}, {builtinTypes->stringType});
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// (...number) -> number
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const TypeId numbersToNumberType =
arena.addType(FunctionType{arena.addTypePack(VariadicTypePack{builtinTypes->numberType}), arena.addTypePack({builtinTypes->numberType})});
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// <T>(T) -> ()
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const TypeId genericTToNothingType = arena.addType(FunctionType{{genericT}, {}, arena.addTypePack({genericT}), builtinTypes->emptyTypePack});
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// <T>(T) -> T
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const TypeId genericTToTType = arena.addType(FunctionType{{genericT}, {}, arena.addTypePack({genericT}), arena.addTypePack({genericT})});
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// <U>(U) -> ()
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const TypeId genericUToNothingType = arena.addType(FunctionType{{genericU}, {}, arena.addTypePack({genericU}), builtinTypes->emptyTypePack});
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// <T>() -> T
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const TypeId genericNothingToTType = arena.addType(FunctionType{{genericT}, {}, builtinTypes->emptyTypePack, arena.addTypePack({genericT})});
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// <A...>(A...) -> A...
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const TypeId genericAsToAsType = arena.addType(FunctionType{{}, {genericAs}, genericAs, genericAs});
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// <A...>(A...) -> number
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const TypeId genericAsToNumberType = arena.addType(FunctionType{{}, {genericAs}, genericAs, arena.addTypePack({builtinTypes->numberType})});
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// <B...>(B...) -> B...
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const TypeId genericBsToBsType = arena.addType(FunctionType{{}, {genericBs}, genericBs, genericBs});
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// <B..., C...>(B...) -> C...
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const TypeId genericBsToCsType = arena.addType(FunctionType{{}, {genericBs, genericCs}, genericBs, genericCs});
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// <A...>() -> A...
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const TypeId genericNothingToAsType = arena.addType(FunctionType{{}, {genericAs}, builtinTypes->emptyTypePack, genericAs});
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// { lower : string -> string }
TypeId tableWithLower = tbl(TableType::Props{{"lower", fn({builtinTypes->stringType}, {builtinTypes->stringType})}});
// { insaneThingNoScalarHas : () -> () }
TypeId tableWithoutScalarProp = tbl(TableType::Props{{"insaneThingNoScalarHas", fn({}, {})}});
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};
#define CHECK_IS_SUBTYPE(left, right) \
do \
{ \
const auto& leftTy = (left); \
const auto& rightTy = (right); \
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SubtypingResult result = isSubtype(leftTy, rightTy); \
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CHECK_MESSAGE(result.isSubtype, "Expected " << leftTy << " <: " << rightTy); \
} while (0)
#define CHECK_IS_NOT_SUBTYPE(left, right) \
do \
{ \
const auto& leftTy = (left); \
const auto& rightTy = (right); \
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SubtypingResult result = isSubtype(leftTy, rightTy); \
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CHECK_MESSAGE(!result.isSubtype, "Expected " << leftTy << " </: " << rightTy); \
} while (0)
#define CHECK_IS_ERROR_SUPPRESSING(left, right) \
do \
{ \
const auto& leftTy = (left); \
const auto& rightTy = (right); \
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SubtypingResult result = isSubtype(leftTy, rightTy); \
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CHECK_MESSAGE(result.isErrorSuppressing, "Expected " << leftTy << " to error-suppress " << rightTy); \
} while (0)
#define CHECK_IS_NOT_ERROR_SUPPRESSING(left, right) \
do \
{ \
const auto& leftTy = (left); \
const auto& rightTy = (right); \
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SubtypingResult result = isSubtype(leftTy, rightTy); \
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CHECK_MESSAGE(!result.isErrorSuppressing, "Expected " << leftTy << " to error-suppress " << rightTy); \
} while (0)
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/// Internal macro for registering a generated test case.
///
/// @param der the name of the derived fixture struct
/// @param reg the name of the registration callback, invoked immediately before
/// tests are ran to register the test
/// @param run the name of the run callback, invoked to actually run the test case
#define TEST_REGISTER(der, reg, run) \
static inline DOCTEST_NOINLINE void run() \
{ \
der fix; \
fix.test(); \
} \
static inline DOCTEST_NOINLINE void reg() \
{ \
/* we have to mark this as `static` to ensure the memory remains alive \
for the entirety of the test process */ \
static std::string name = der().testName; \
doctest::detail::regTest(doctest::detail::TestCase(run, __FILE__, __LINE__, \
doctest_detail_test_suite_ns::getCurrentTestSuite()) /* the test case's name, determined at runtime */ \
* name.c_str() /* getCurrentTestSuite() only works at static initialization \
time due to implementation details. To ensure that test cases \
are grouped where they should be, manually override the suite \
with the test_suite decorator. */ \
* doctest::test_suite("Subtyping")); \
} \
DOCTEST_GLOBAL_NO_WARNINGS(DOCTEST_ANONYMOUS(DOCTEST_ANON_VAR_), addTestCallback(reg));
/// Internal macro for deriving a test case fixture. Roughly analogous to
/// DOCTEST_IMPLEMENT_FIXTURE.
///
/// @param op a function (or macro) to call that compares the subtype to
/// the supertype.
/// @param symbol the symbol to use in stringification
/// @param der the name of the derived fixture struct
/// @param left the subtype expression
/// @param right the supertype expression
#define TEST_DERIVE(op, symbol, der, left, right) \
namespace \
{ \
struct der : SubtypeFixture \
{ \
const TypeId subTy = (left); \
const TypeId superTy = (right); \
const std::string testName = toString(subTy) + " " symbol " " + toString(superTy); \
inline DOCTEST_NOINLINE void test() \
{ \
op(subTy, superTy); \
} \
}; \
TEST_REGISTER(der, DOCTEST_ANONYMOUS(DOCTEST_ANON_FUNC_), DOCTEST_ANONYMOUS(DOCTEST_ANON_FUNC_)); \
}
/// Generates a test that checks if a type is a subtype of another.
#define TEST_IS_SUBTYPE(left, right) TEST_DERIVE(CHECK_IS_SUBTYPE, "<:", DOCTEST_ANONYMOUS(DOCTEST_ANON_CLASS_), left, right)
/// Generates a test that checks if a type is _not_ a subtype of another.
/// Uses <!: instead of </: to ensure that rotest doesn't explode when it splits
/// on / characters.
#define TEST_IS_NOT_SUBTYPE(left, right) TEST_DERIVE(CHECK_IS_NOT_SUBTYPE, "<!:", DOCTEST_ANONYMOUS(DOCTEST_ANON_CLASS_), left, right)
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TEST_SUITE_BEGIN("Subtyping");
// We would like to write </: to mean "is not a subtype," but rotest does not like that at all, so we instead use <!:
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TEST_IS_SUBTYPE(builtinTypes->numberType, builtinTypes->anyType);
TEST_IS_NOT_SUBTYPE(builtinTypes->numberType, builtinTypes->stringType);
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TEST_CASE_FIXTURE(SubtypeFixture, "any <!: unknown")
{
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SubtypingResult result = isSubtype(builtinTypes->anyType, builtinTypes->unknownType);
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CHECK(!result.isSubtype);
CHECK(result.isErrorSuppressing);
}
TEST_CASE_FIXTURE(SubtypeFixture, "number? <: unknown")
{
CHECK_IS_SUBTYPE(builtinTypes->optionalNumberType, builtinTypes->unknownType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "number <: unknown")
{
CHECK_IS_SUBTYPE(builtinTypes->numberType, builtinTypes->unknownType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "number <: number")
{
CHECK_IS_SUBTYPE(builtinTypes->numberType, builtinTypes->numberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "number <: number?")
{
CHECK_IS_SUBTYPE(builtinTypes->numberType, builtinTypes->optionalNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" <: string")
{
CHECK_IS_SUBTYPE(helloType, builtinTypes->stringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "string <!: \"hello\"")
{
CHECK_IS_NOT_SUBTYPE(builtinTypes->stringType, helloType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" <: \"hello\"")
{
CHECK_IS_SUBTYPE(helloType, helloType2);
}
TEST_CASE_FIXTURE(SubtypeFixture, "true <: boolean")
{
CHECK_IS_SUBTYPE(builtinTypes->trueType, builtinTypes->booleanType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "true <: true | false")
{
CHECK_IS_SUBTYPE(builtinTypes->trueType, trueOrFalseType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "true | false <!: true")
{
CHECK_IS_NOT_SUBTYPE(trueOrFalseType, builtinTypes->trueType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "true | false <: boolean")
{
CHECK_IS_SUBTYPE(trueOrFalseType, builtinTypes->booleanType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "true | false <: true | false")
{
CHECK_IS_SUBTYPE(trueOrFalseType, trueOrFalseType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" | \"world\" <: number")
{
CHECK_IS_NOT_SUBTYPE(helloOrWorldType, builtinTypes->numberType);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "string <!: ('hello' | 'hello')")
{
CHECK_IS_NOT_SUBTYPE(builtinTypes->stringType, helloOrHelloType);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "true <: boolean & true")
{
CHECK_IS_SUBTYPE(builtinTypes->trueType, booleanAndTrueType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "boolean & true <: true")
{
CHECK_IS_SUBTYPE(booleanAndTrueType, builtinTypes->trueType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "boolean & true <: boolean & true")
{
CHECK_IS_SUBTYPE(booleanAndTrueType, booleanAndTrueType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" & \"world\" <: number")
{
CHECK_IS_SUBTYPE(helloAndWorldType, builtinTypes->numberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "false <!: boolean & true")
{
CHECK_IS_NOT_SUBTYPE(builtinTypes->falseType, booleanAndTrueType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(unknown) -> string <: (number) -> string")
{
CHECK_IS_SUBTYPE(unknownToStringType, numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> string <!: (unknown) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberToStringType, unknownToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, number) -> string <!: (number) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberNumberToStringType, numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> string <!: (number, number) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberToStringType, numberNumberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, number) -> string <!: (unknown, number) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberNumberToStringType, unknownNumberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(unknown, number) -> string <: (number, number) -> string")
{
CHECK_IS_SUBTYPE(unknownNumberToStringType, numberNumberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> (string, unknown) <!: (number) -> (string, string)")
{
CHECK_IS_NOT_SUBTYPE(numberToStringAndUnknownType, numberToTwoStringsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> (string, string) <: (number) -> (string, unknown)")
{
CHECK_IS_SUBTYPE(numberToTwoStringsType, numberToStringAndUnknownType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> (string, string) <!: (number) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberToTwoStringsType, numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> string <!: (number) -> (string, string)")
{
CHECK_IS_NOT_SUBTYPE(numberToStringType, numberToTwoStringsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, ...string) -> string <: (number) -> string")
{
CHECK_IS_SUBTYPE(numberAndStringsToStringType, numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> string <!: (number, ...string) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberToStringType, numberAndStringsToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, ...string?) -> string <: (number, ...string) -> string")
{
CHECK_IS_SUBTYPE(numberAndOptionalStringsToStringType, numberAndStringsToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, ...string) -> string <!: (number, ...string?) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberAndStringsToStringType, numberAndOptionalStringsToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, ...string) -> string <: (number, string) -> string")
{
CHECK_IS_SUBTYPE(numberAndStringsToStringType, numberAndStringToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number, string) -> string <!: (number, ...string) -> string")
{
CHECK_IS_NOT_SUBTYPE(numberAndStringToStringType, numberAndStringsToStringType);
}
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/*
* <A>(A) -> A <: <X>(X) -> X
* A can be bound to X.
*
* <A>(A) -> A </: <X>(X) -> number
* A can be bound to X, but A </: number
*
* (number) -> number </: <A>(A) -> A
* Only generics on the left side can be bound.
* number </: A
*
* <A, B>(A, B) -> boolean <: <X>(X, X) -> boolean
* It is ok to bind both A and B to X.
*
* <A>(A, A) -> boolean </: <X, Y>(X, Y) -> boolean
* A cannot be bound to both X and Y.
*/
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TEST_CASE_FIXTURE(SubtypeFixture, "<T>() -> T <: () -> number")
{
CHECK_IS_SUBTYPE(genericNothingToTType, nothingToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<T>(T) -> () <: <U>(U) -> ()")
{
CHECK_IS_SUBTYPE(genericTToNothingType, genericUToNothingType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "() -> number <!: <T>() -> T")
{
CHECK_IS_NOT_SUBTYPE(nothingToNumberType, genericNothingToTType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<T>(T) -> () <: (number) -> ()")
{
CHECK_IS_SUBTYPE(genericTToNothingType, numberToNothingType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<T>(T) -> T <: (number) -> number")
{
CHECK_IS_SUBTYPE(genericTToTType, numberToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<T>(T) -> T <!: (number) -> string")
{
CHECK_IS_NOT_SUBTYPE(genericTToTType, numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<T>(T) -> () <: <U>(U) -> ()")
{
CHECK_IS_SUBTYPE(genericTToNothingType, genericUToNothingType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> () <!: <T>(T) -> ()")
{
CHECK_IS_NOT_SUBTYPE(numberToNothingType, genericTToNothingType);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "<T>() -> (T, T) <!: () -> (string, number)")
{
TypeId nothingToTwoTs = arena.addType(FunctionType{
{genericT},
{},
builtinTypes->emptyTypePack,
arena.addTypePack({genericT, genericT})
});
TypeId nothingToStringAndNumber = fn({}, {builtinTypes->stringType, builtinTypes->numberType});
CHECK_IS_NOT_SUBTYPE(nothingToTwoTs, nothingToStringAndNumber);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> A... <: (number) -> number")
{
CHECK_IS_SUBTYPE(genericAsToAsType, numberToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> number <!: <A...>(A...) -> A...")
{
CHECK_IS_NOT_SUBTYPE(numberToNumberType, genericAsToAsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> A... <: <B...>(B...) -> B...")
{
CHECK_IS_SUBTYPE(genericAsToAsType, genericBsToBsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<B..., C...>(B...) -> C... <: <A...>(A...) -> A...")
{
CHECK_IS_SUBTYPE(genericBsToCsType, genericAsToAsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> A... <!: <B..., C...>(B...) -> C...")
{
CHECK_IS_NOT_SUBTYPE(genericAsToAsType, genericBsToCsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> number <: (number) -> number")
{
CHECK_IS_SUBTYPE(genericAsToNumberType, numberToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(number) -> number <!: <A...>(A...) -> number")
{
CHECK_IS_NOT_SUBTYPE(numberToNumberType, genericAsToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> number <: (...number) -> number")
{
CHECK_IS_SUBTYPE(genericAsToNumberType, numbersToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(...number) -> number <!: <A...>(A...) -> number")
{
CHECK_IS_NOT_SUBTYPE(numbersToNumberType, genericAsToNumberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>() -> A... <: () -> ()")
{
CHECK_IS_SUBTYPE(genericNothingToAsType, nothingToNothingType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "() -> () <!: <A...>() -> A...")
{
CHECK_IS_NOT_SUBTYPE(nothingToNothingType, genericNothingToAsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "<A...>(A...) -> A... <: () -> ()")
{
CHECK_IS_SUBTYPE(genericAsToAsType, nothingToNothingType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "() -> () <!: <A...>(A...) -> A...")
{
CHECK_IS_NOT_SUBTYPE(nothingToNothingType, genericAsToAsType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "{} <: {}")
{
CHECK_IS_SUBTYPE(tbl({}), tbl({}));
}
TEST_CASE_FIXTURE(SubtypeFixture, "{x: number} <: {}")
{
CHECK_IS_SUBTYPE(tbl({{"x", builtinTypes->numberType}}), tbl({}));
}
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TEST_CASE_FIXTURE(SubtypeFixture, "{} <!: {x: number}")
{
CHECK_IS_NOT_SUBTYPE(tbl({}), tbl({{"x", builtinTypes->numberType}}));
}
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TEST_CASE_FIXTURE(SubtypeFixture, "{x: number} <!: {x: string}")
{
CHECK_IS_NOT_SUBTYPE(tbl({{"x", builtinTypes->numberType}}), tbl({{"x", builtinTypes->stringType}}));
}
TEST_CASE_FIXTURE(SubtypeFixture, "{x: number} <!: {x: number?}")
{
CHECK_IS_NOT_SUBTYPE(tbl({{"x", builtinTypes->numberType}}), tbl({{"x", builtinTypes->optionalNumberType}}));
}
TEST_CASE_FIXTURE(SubtypeFixture, "{x: number?} <!: {x: number}")
{
CHECK_IS_NOT_SUBTYPE(tbl({{"x", builtinTypes->optionalNumberType}}), tbl({{"x", builtinTypes->numberType}}));
}
TEST_CASE_FIXTURE(SubtypeFixture, "{x: <T>(T) -> ()} <: {x: <U>(U) -> ()}")
{
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CHECK_IS_SUBTYPE(tbl({{"x", genericTToNothingType}}), tbl({{"x", genericUToNothingType}}));
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}
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TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable { x: number } } <: { @metatable {} }")
{
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CHECK_IS_SUBTYPE(meta({{"x", builtinTypes->numberType}}), meta({}));
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}
TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable { x: number } } <!: { @metatable { x: boolean } }")
{
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CHECK_IS_NOT_SUBTYPE(meta({{"x", builtinTypes->numberType}}), meta({{"x", builtinTypes->booleanType}}));
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}
TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable {} } <!: { @metatable { x: boolean } }")
{
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CHECK_IS_NOT_SUBTYPE(meta({}), meta({{"x", builtinTypes->booleanType}}));
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}
TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable {} } <: {}")
{
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CHECK_IS_SUBTYPE(meta({}), tbl({}));
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}
TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable { u: boolean }, x: number } <: { x: number }")
{
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CHECK_IS_SUBTYPE(meta({{"u", builtinTypes->booleanType}}, {{"x", builtinTypes->numberType}}), tbl({{"x", builtinTypes->numberType}}));
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}
TEST_CASE_FIXTURE(SubtypeFixture, "{ @metatable { x: number } } <!: { x: number }")
{
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CHECK_IS_NOT_SUBTYPE(meta({{"x", builtinTypes->numberType}}), tbl({{"x", builtinTypes->numberType}}));
}
// Negated subtypes
TEST_IS_NOT_SUBTYPE(negate(builtinTypes->neverType), builtinTypes->stringType);
TEST_IS_SUBTYPE(negate(builtinTypes->unknownType), builtinTypes->stringType);
TEST_IS_NOT_SUBTYPE(negate(builtinTypes->anyType), builtinTypes->stringType);
TEST_IS_SUBTYPE(negate(meet(builtinTypes->neverType, builtinTypes->unknownType)), builtinTypes->stringType);
TEST_IS_NOT_SUBTYPE(negate(join(builtinTypes->neverType, builtinTypes->unknownType)), builtinTypes->stringType);
// Negated supertypes: never/unknown/any/error
TEST_IS_SUBTYPE(builtinTypes->stringType, negate(builtinTypes->neverType));
TEST_IS_SUBTYPE(builtinTypes->neverType, negate(builtinTypes->unknownType));
TEST_IS_NOT_SUBTYPE(builtinTypes->stringType, negate(builtinTypes->unknownType));
TEST_IS_SUBTYPE(builtinTypes->numberType, negate(builtinTypes->anyType));
TEST_IS_SUBTYPE(builtinTypes->unknownType, negate(builtinTypes->anyType));
// Negated supertypes: unions
TEST_IS_SUBTYPE(builtinTypes->booleanType, negate(join(builtinTypes->stringType, builtinTypes->numberType)));
TEST_IS_SUBTYPE(rootClass, negate(join(childClass, builtinTypes->numberType)));
TEST_IS_SUBTYPE(str("foo"), negate(join(builtinTypes->numberType, builtinTypes->booleanType)));
TEST_IS_NOT_SUBTYPE(str("foo"), negate(join(builtinTypes->stringType, builtinTypes->numberType)));
TEST_IS_NOT_SUBTYPE(childClass, negate(join(rootClass, builtinTypes->numberType)));
TEST_IS_NOT_SUBTYPE(numbersToNumberType, negate(join(builtinTypes->functionType, rootClass)));
// Negated supertypes: intersections
TEST_IS_SUBTYPE(builtinTypes->booleanType, negate(meet(builtinTypes->stringType, str("foo"))));
TEST_IS_SUBTYPE(builtinTypes->trueType, negate(meet(builtinTypes->booleanType, builtinTypes->numberType)));
TEST_IS_SUBTYPE(rootClass, negate(meet(builtinTypes->classType, childClass)));
TEST_IS_SUBTYPE(childClass, negate(meet(builtinTypes->classType, builtinTypes->numberType)));
TEST_IS_NOT_SUBTYPE(builtinTypes->unknownType, negate(meet(builtinTypes->classType, builtinTypes->numberType)));
TEST_IS_NOT_SUBTYPE(str("foo"), negate(meet(builtinTypes->stringType, negate(str("bar")))));
// Negated supertypes: tables and metatables
TEST_IS_SUBTYPE(tbl({}), negate(builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(tbl({}), negate(builtinTypes->tableType));
TEST_IS_SUBTYPE(meta({}), negate(builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(meta({}), negate(builtinTypes->tableType));
// Negated supertypes: Functions
TEST_IS_SUBTYPE(numberToNumberType, negate(builtinTypes->classType));
TEST_IS_NOT_SUBTYPE(numberToNumberType, negate(builtinTypes->functionType));
// Negated supertypes: Primitives and singletons
TEST_IS_SUBTYPE(builtinTypes->stringType, negate(builtinTypes->numberType));
TEST_IS_SUBTYPE(str("foo"), meet(builtinTypes->stringType, negate(str("bar"))));
TEST_IS_NOT_SUBTYPE(builtinTypes->trueType, negate(builtinTypes->booleanType));
TEST_IS_NOT_SUBTYPE(str("foo"), negate(str("foo")));
TEST_IS_NOT_SUBTYPE(str("foo"), negate(builtinTypes->stringType));
TEST_IS_SUBTYPE(builtinTypes->falseType, negate(builtinTypes->trueType));
TEST_IS_SUBTYPE(builtinTypes->falseType, meet(builtinTypes->booleanType, negate(builtinTypes->trueType)));
TEST_IS_NOT_SUBTYPE(builtinTypes->stringType, meet(builtinTypes->booleanType, negate(builtinTypes->trueType)));
TEST_IS_NOT_SUBTYPE(builtinTypes->stringType, negate(str("foo")));
TEST_IS_NOT_SUBTYPE(builtinTypes->booleanType, negate(builtinTypes->falseType));
// Negated supertypes: Classes
TEST_IS_SUBTYPE(rootClass, negate(builtinTypes->tableType));
TEST_IS_NOT_SUBTYPE(rootClass, negate(builtinTypes->classType));
TEST_IS_NOT_SUBTYPE(childClass, negate(rootClass));
TEST_IS_NOT_SUBTYPE(childClass, meet(builtinTypes->classType, negate(rootClass)));
TEST_IS_SUBTYPE(anotherChildClass, meet(builtinTypes->classType, negate(childClass)));
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TEST_CASE_FIXTURE(SubtypeFixture, "Root <: class")
{
CHECK_IS_SUBTYPE(rootClass, builtinTypes->classType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child | AnotherChild <: class")
{
CHECK_IS_SUBTYPE(join(childClass, anotherChildClass), builtinTypes->classType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child | AnotherChild <: Child | AnotherChild")
{
CHECK_IS_SUBTYPE(join(childClass, anotherChildClass), join(childClass, anotherChildClass));
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child | Root <: Root")
{
CHECK_IS_SUBTYPE(join(childClass, rootClass), rootClass);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child & AnotherChild <: class")
{
CHECK_IS_SUBTYPE(meet(childClass, anotherChildClass), builtinTypes->classType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child & Root <: class")
{
CHECK_IS_SUBTYPE(meet(childClass, rootClass), builtinTypes->classType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child & ~Root <: class")
{
CHECK_IS_SUBTYPE(meet(childClass, negate(rootClass)), builtinTypes->classType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child & AnotherChild <: number")
{
CHECK_IS_SUBTYPE(meet(childClass, anotherChildClass), builtinTypes->numberType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Child & ~GrandchildOne <!: number")
{
CHECK_IS_NOT_SUBTYPE(meet(childClass, negate(grandchildOneClass)), builtinTypes->numberType);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "t1 where t1 = {trim: (t1) -> string} <: t2 where t2 = {trim: (t2) -> string}")
{
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TypeId t1 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {builtinTypes->stringType});
});
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TypeId t2 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {builtinTypes->stringType});
});
CHECK_IS_SUBTYPE(t1, t2);
}
TEST_CASE_FIXTURE(SubtypeFixture, "t1 where t1 = {trim: (t1) -> string} <!: t2 where t2 = {trim: (t2) -> t2}")
{
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TypeId t1 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {builtinTypes->stringType});
});
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TypeId t2 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {ty});
});
CHECK_IS_NOT_SUBTYPE(t1, t2);
}
TEST_CASE_FIXTURE(SubtypeFixture, "t1 where t1 = {trim: (t1) -> t1} <!: t2 where t2 = {trim: (t2) -> string}")
{
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TypeId t1 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {ty});
});
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TypeId t2 = cyclicTable([&](TypeId ty, TableType* tt) {
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tt->props["trim"] = fn({ty}, {builtinTypes->stringType});
});
CHECK_IS_NOT_SUBTYPE(t1, t2);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "Vec2 <: { X: number, Y: number }")
{
TypeId xy = tbl({
{"X", builtinTypes->numberType},
{"Y", builtinTypes->numberType},
});
CHECK_IS_SUBTYPE(vec2Class, xy);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Vec2 <: { X: number }")
{
TypeId x = tbl({
{"X", builtinTypes->numberType},
});
CHECK_IS_SUBTYPE(vec2Class, x);
}
TEST_CASE_FIXTURE(SubtypeFixture, "{ X: number, Y: number } <!: Vec2")
{
TypeId xy = tbl({
{"X", builtinTypes->numberType},
{"Y", builtinTypes->numberType},
});
CHECK_IS_NOT_SUBTYPE(xy, vec2Class);
}
TEST_CASE_FIXTURE(SubtypeFixture, "{ X: number } <!: Vec2")
{
TypeId x = tbl({
{"X", builtinTypes->numberType},
});
CHECK_IS_NOT_SUBTYPE(x, vec2Class);
}
TEST_CASE_FIXTURE(SubtypeFixture, "table & { X: number, Y: number } <!: Vec2")
{
TypeId x = tbl({
{"X", builtinTypes->numberType},
{"Y", builtinTypes->numberType},
});
CHECK_IS_NOT_SUBTYPE(meet(builtinTypes->tableType, x), vec2Class);
}
TEST_CASE_FIXTURE(SubtypeFixture, "Vec2 <!: table & { X: number, Y: number }")
{
TypeId xy = tbl({
{"X", builtinTypes->numberType},
{"Y", builtinTypes->numberType},
});
CHECK_IS_NOT_SUBTYPE(vec2Class, meet(builtinTypes->tableType, xy));
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" <: { lower : (string) -> string }")
{
CHECK_IS_SUBTYPE(helloType, tableWithLower);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"hello\" <!: { insaneThingNoScalarHas : () -> () }")
{
CHECK_IS_NOT_SUBTYPE(helloType, tableWithoutScalarProp);
}
TEST_CASE_FIXTURE(SubtypeFixture, "string <: { lower : (string) -> string }")
{
CHECK_IS_SUBTYPE(builtinTypes->stringType, tableWithLower);
}
TEST_CASE_FIXTURE(SubtypeFixture, "string <!: { insaneThingNoScalarHas : () -> () }")
{
CHECK_IS_NOT_SUBTYPE(builtinTypes->stringType, tableWithoutScalarProp);
}
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TEST_CASE_FIXTURE(SubtypeFixture, "~fun & (string) -> number <: (string) -> number")
{
CHECK_IS_SUBTYPE(meet(negate(builtinTypes->functionType), numberToStringType), numberToStringType);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(string) -> number <: ~fun & (string) -> number")
{
CHECK_IS_NOT_SUBTYPE(numberToStringType, meet(negate(builtinTypes->functionType), numberToStringType));
}
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TEST_CASE_FIXTURE(SubtypeFixture, "~\"a\" & ~\"b\" & string <: { lower : (string) -> ()}")
{
CHECK_IS_SUBTYPE(meet(meet(negate(aType), negate(bType)), builtinTypes->stringType), tableWithLower);
}
TEST_CASE_FIXTURE(SubtypeFixture, "\"a\" | (~\"b\" & string) <: { lower : (string) -> ()}")
{
CHECK_IS_SUBTYPE(join(aType, meet(negate(bType), builtinTypes->stringType)), tableWithLower);
}
TEST_CASE_FIXTURE(SubtypeFixture, "(string | number) & (\"a\" | true) <: { lower: (string) -> string }")
{
auto base = meet(join(builtinTypes->stringType, builtinTypes->numberType), join(aType, trueSingleton));
CHECK_IS_SUBTYPE(base, tableWithLower);
}
/*
* Within the scope to which a generic belongs, that generic ought to be treated
* as its bounds.
*
* We do not yet support bounded generics, so all generics are considered to be
* bounded by unknown.
*/
TEST_CASE_FIXTURE(SubtypeFixture, "unknown <: X")
{
ScopePtr childScope{new Scope(rootScope)};
ScopePtr grandChildScope{new Scope(childScope)};
TypeId genericX = arena.addType(GenericType(childScope.get(), "X"));
SubtypingResult usingGlobalScope = subtyping.isSubtype(builtinTypes->unknownType, genericX);
CHECK_MESSAGE(!usingGlobalScope.isSubtype, "Expected " << builtinTypes->unknownType << " </: " << genericX);
Subtyping childSubtyping{mkSubtyping(childScope)};
SubtypingResult usingChildScope = childSubtyping.isSubtype(builtinTypes->unknownType, genericX);
CHECK_MESSAGE(usingChildScope.isSubtype, "Expected " << builtinTypes->unknownType << " <: " << genericX);
Subtyping grandChildSubtyping{mkSubtyping(grandChildScope)};
SubtypingResult usingGrandChildScope = grandChildSubtyping.isSubtype(builtinTypes->unknownType, genericX);
CHECK_MESSAGE(usingGrandChildScope.isSubtype, "Expected " << builtinTypes->unknownType << " <: " << genericX);
}
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TEST_IS_SUBTYPE(idx(builtinTypes->numberType, builtinTypes->numberType), tbl({}));
TEST_IS_NOT_SUBTYPE(tbl({}), idx(builtinTypes->numberType, builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(tbl({{"X", builtinTypes->numberType}}), idx(builtinTypes->numberType, builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(idx(builtinTypes->numberType, builtinTypes->numberType), tbl({{"X", builtinTypes->numberType}}));
TEST_IS_NOT_SUBTYPE(idx(join(builtinTypes->numberType, builtinTypes->stringType), builtinTypes->numberType), idx(builtinTypes->numberType, builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(idx(builtinTypes->numberType, builtinTypes->numberType), idx(join(builtinTypes->numberType, builtinTypes->stringType), builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(idx(builtinTypes->numberType, join(builtinTypes->stringType, builtinTypes->numberType)), idx(builtinTypes->numberType, builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(idx(builtinTypes->numberType, builtinTypes->numberType), idx(builtinTypes->numberType, join(builtinTypes->stringType, builtinTypes->numberType)));
TEST_IS_NOT_SUBTYPE(tbl({{"X", builtinTypes->numberType}}), idx(builtinTypes->stringType, builtinTypes->numberType));
TEST_IS_SUBTYPE(idx(builtinTypes->stringType, builtinTypes->numberType), tbl({{"X", builtinTypes->numberType}}));
TEST_IS_NOT_SUBTYPE(tbl({{"X", opt(builtinTypes->numberType)}}), idx(builtinTypes->stringType, builtinTypes->numberType));
TEST_IS_NOT_SUBTYPE(idx(builtinTypes->stringType, builtinTypes->numberType), tbl({{"X", opt(builtinTypes->numberType)}}));
TEST_IS_SUBTYPE(tbl({{"X", builtinTypes->numberType}, {"Y", builtinTypes->numberType}}), tbl({{"X", builtinTypes->numberType}}));
TEST_IS_NOT_SUBTYPE(tbl({{"X", builtinTypes->numberType}}), tbl({{"X", builtinTypes->numberType}, {"Y", builtinTypes->numberType}}));
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TEST_CASE_FIXTURE(SubtypeFixture, "interior_tests_are_cached")
{
TypeId tableA = tbl({{"X", builtinTypes->numberType}, {"Y", builtinTypes->numberType}});
TypeId tableB = tbl({{"X", builtinTypes->optionalNumberType}, {"Y", builtinTypes->optionalNumberType}});
CHECK_IS_NOT_SUBTYPE(tableA, tableB);
const SubtypingResult* cachedResult = subtyping.peekCache().find({builtinTypes->numberType, builtinTypes->optionalNumberType});
REQUIRE(cachedResult);
CHECK(cachedResult->isSubtype);
cachedResult = subtyping.peekCache().find({tableA, tableB});
REQUIRE(cachedResult);
CHECK(!cachedResult->isSubtype);
}
TEST_CASE_FIXTURE(SubtypeFixture, "results_that_are_contingent_on_generics_are_not_cached")
{
// <T>(T) -> T <: (number) -> number
CHECK_IS_SUBTYPE(genericTToTType, numberToNumberType);
CHECK(subtyping.peekCache().empty());
}
TEST_CASE_FIXTURE(SubtypeFixture, "dont_cache_tests_involving_cycles")
{
TypeId tableA = arena.addType(BlockedType{});
TypeId tableA2 = tbl({{"self", tableA}});
asMutable(tableA)->ty.emplace<BoundType>(tableA2);
TypeId tableB = arena.addType(BlockedType{});
TypeId tableB2 = tbl({{"self", tableB}});
asMutable(tableB)->ty.emplace<BoundType>(tableB2);
CHECK_IS_SUBTYPE(tableA, tableB);
CHECK(!subtyping.peekCache().find({tableA, tableB}));
}
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TEST_SUITE_END();
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TEST_SUITE_BEGIN("Subtyping.Subpaths");
TEST_CASE_FIXTURE(SubtypeFixture, "table_property")
{
TypeId subTy = tbl({{"X", builtinTypes->numberType}});
TypeId superTy = tbl({{"X", builtinTypes->booleanType}});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ Path(TypePath::Property("X")),
/* superPath */ Path(TypePath::Property("X")),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "table_indexers")
{
TypeId subTy = idx(builtinTypes->numberType, builtinTypes->stringType);
TypeId superTy = idx(builtinTypes->stringType, builtinTypes->numberType);
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ Path(TypePath::TypeField::IndexLookup),
/* superPath */ Path(TypePath::TypeField::IndexLookup),
});
subTy = idx(builtinTypes->stringType, builtinTypes->stringType);
result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ Path(TypePath::TypeField::IndexResult),
/* superPath */ Path(TypePath::TypeField::IndexResult),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "fn_arguments")
{
TypeId subTy = fn({builtinTypes->numberType}, {});
TypeId superTy = fn({builtinTypes->stringType}, {});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().args().index(0).build(),
/* superPath */ TypePath::PathBuilder().args().index(0).build(),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "fn_arguments_tail")
{
TypeId subTy = fn({}, VariadicTypePack{builtinTypes->numberType}, {});
TypeId superTy = fn({}, VariadicTypePack{builtinTypes->stringType}, {});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().args().tail().variadic().build(),
/* superPath */ TypePath::PathBuilder().args().tail().variadic().build(),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "fn_rets")
{
TypeId subTy = fn({}, {builtinTypes->numberType});
TypeId superTy = fn({}, {builtinTypes->stringType});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().rets().index(0).build(),
/* superPath */ TypePath::PathBuilder().rets().index(0).build(),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "fn_rets_tail")
{
TypeId subTy = fn({}, {}, VariadicTypePack{builtinTypes->numberType});
TypeId superTy = fn({}, {}, VariadicTypePack{builtinTypes->stringType});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().rets().tail().variadic().build(),
/* superPath */ TypePath::PathBuilder().rets().tail().variadic().build(),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "nested_table_properties")
{
TypeId subTy = tbl({{"X", tbl({{"Y", tbl({{"Z", builtinTypes->numberType}})}})}});
TypeId superTy = tbl({{"X", tbl({{"Y", tbl({{"Z", builtinTypes->stringType}})}})}});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().prop("X").prop("Y").prop("Z").build(),
/* superPath */ TypePath::PathBuilder().prop("X").prop("Y").prop("Z").build(),
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "string_table_mt")
{
TypeId subTy = builtinTypes->stringType;
TypeId superTy = tbl({{"X", builtinTypes->numberType}});
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
// This check is weird. Because we don't have built-in types, we don't have
// the string metatable. That means subtyping will see that the entire
// metatable is empty, and abort there, without looking at the metatable
// properties (because there aren't any).
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::PathBuilder().mt().prop("__index").build(),
/* superPath */ TypePath::kEmpty,
});
}
TEST_CASE_FIXTURE(SubtypeFixture, "negation")
{
TypeId subTy = builtinTypes->numberType;
TypeId superTy = negate(builtinTypes->numberType);
SubtypingResult result = isSubtype(subTy, superTy);
CHECK(!result.isSubtype);
CHECK(result.reasoning == SubtypingReasoning{
/* subPath */ TypePath::kEmpty,
/* superPath */ Path(TypePath::TypeField::Negated),
});
}
TEST_SUITE_END();