luau/tests/ToString.test.cpp
Arseny Kapoulkine 944e8375aa
Sync to upstream/release/547 (#690)
- Type aliases can no longer override primitive types; attempts to do
that will result in a type error
- Fix misleading type error messages for mismatches in expression list
length during assignment
- Fix incorrect type name display in certain cases
- setmetatable/getmetatable are now ~2x faster
- tools/perfstat.py can be used to display statistics about profiles
captured via --profile switch
2022-09-29 15:23:10 -07:00

809 lines
24 KiB
C++

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "Luau/Scope.h"
#include "Luau/ToString.h"
#include "Fixture.h"
#include "doctest.h"
using namespace Luau;
LUAU_FASTFLAG(LuauRecursiveTypeParameterRestriction);
LUAU_FASTFLAG(LuauSpecialTypesAsterisked);
LUAU_FASTFLAG(LuauFixNameMaps);
TEST_SUITE_BEGIN("ToString");
TEST_CASE_FIXTURE(Fixture, "primitive")
{
CheckResult result = check("local a = nil local b = 44 local c = 'lalala' local d = true");
LUAU_REQUIRE_NO_ERRORS(result);
// A variable without an annotation and with a nil literal should infer as 'free', not 'nil'
CHECK_NE("nil", toString(requireType("a")));
CHECK_EQ("number", toString(requireType("b")));
CHECK_EQ("string", toString(requireType("c")));
CHECK_EQ("boolean", toString(requireType("d")));
}
TEST_CASE_FIXTURE(Fixture, "bound_types")
{
CheckResult result = check("local a = 444 local b = a");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("number", toString(requireType("b")));
}
TEST_CASE_FIXTURE(Fixture, "free_types")
{
CheckResult result = check("local a");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("a", toString(requireType("a")));
}
TEST_CASE_FIXTURE(Fixture, "cyclic_table")
{
TypeVar cyclicTable{TypeVariant(TableTypeVar())};
TableTypeVar* tableOne = getMutable<TableTypeVar>(&cyclicTable);
tableOne->props["self"] = {&cyclicTable};
CHECK_EQ("t1 where t1 = { self: t1 }", toString(&cyclicTable));
}
TEST_CASE_FIXTURE(Fixture, "named_table")
{
TypeVar table{TypeVariant(TableTypeVar())};
TableTypeVar* t = getMutable<TableTypeVar>(&table);
t->name = "TheTable";
CHECK_EQ("TheTable", toString(&table));
}
TEST_CASE_FIXTURE(Fixture, "empty_table")
{
CheckResult result = check(R"(
local a: {}
)");
CHECK_EQ("{| |}", toString(requireType("a")));
// Should stay the same with useLineBreaks enabled
ToStringOptions opts;
opts.useLineBreaks = true;
CHECK_EQ("{| |}", toString(requireType("a"), opts));
}
TEST_CASE_FIXTURE(Fixture, "table_respects_use_line_break")
{
CheckResult result = check(R"(
local a: { prop: string, anotherProp: number, thirdProp: boolean }
)");
ToStringOptions opts;
opts.useLineBreaks = true;
opts.indent = true;
//clang-format off
CHECK_EQ("{|\n"
" anotherProp: number,\n"
" prop: string,\n"
" thirdProp: boolean\n"
"|}",
toString(requireType("a"), opts));
//clang-format on
}
TEST_CASE_FIXTURE(Fixture, "metatable")
{
TypeVar table{TypeVariant(TableTypeVar())};
TypeVar metatable{TypeVariant(TableTypeVar())};
TypeVar mtv{TypeVariant(MetatableTypeVar{&table, &metatable})};
CHECK_EQ("{ @metatable { }, { } }", toString(&mtv));
}
TEST_CASE_FIXTURE(Fixture, "named_metatable")
{
TypeVar table{TypeVariant(TableTypeVar())};
TypeVar metatable{TypeVariant(TableTypeVar())};
TypeVar mtv{TypeVariant(MetatableTypeVar{&table, &metatable, "NamedMetatable"})};
CHECK_EQ("NamedMetatable", toString(&mtv));
}
TEST_CASE_FIXTURE(BuiltinsFixture, "named_metatable_toStringNamedFunction")
{
CheckResult result = check(R"(
local function createTbl(): NamedMetatable
return setmetatable({}, {})
end
type NamedMetatable = typeof(createTbl())
)");
TypeId ty = requireType("createTbl");
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(ty));
REQUIRE(ftv);
CHECK_EQ("createTbl(): NamedMetatable", toStringNamedFunction("createTbl", *ftv));
}
TEST_CASE_FIXTURE(BuiltinsFixture, "exhaustive_toString_of_cyclic_table")
{
CheckResult result = check(R"(
--!strict
local Vec3 = {}
Vec3.__index = Vec3
function Vec3.new()
return setmetatable({x=0, y=0, z=0}, Vec3)
end
export type Vec3 = typeof(Vec3.new())
local thefun: any = function(self, o) return self end
local multiply: ((Vec3, Vec3) -> Vec3) & ((Vec3, number) -> Vec3) = thefun
Vec3.__mul = multiply
local a = Vec3.new()
)");
std::string a = toString(requireType("a"), {true});
CHECK_EQ(std::string::npos, a.find("CYCLE"));
CHECK_EQ(std::string::npos, a.find("TRUNCATED"));
//clang-format off
CHECK_EQ("t2 where "
"t1 = { __index: t1, __mul: ((t2, number) -> t2) & ((t2, t2) -> t2), new: () -> t2 } ; "
"t2 = { @metatable t1, {| x: number, y: number, z: number |} }",
a);
//clang-format on
}
TEST_CASE_FIXTURE(Fixture, "intersection_parenthesized_only_if_needed")
{
auto utv = TypeVar{UnionTypeVar{{typeChecker.numberType, typeChecker.stringType}}};
auto itv = TypeVar{IntersectionTypeVar{{&utv, typeChecker.booleanType}}};
CHECK_EQ(toString(&itv), "(number | string) & boolean");
}
TEST_CASE_FIXTURE(Fixture, "union_parenthesized_only_if_needed")
{
auto itv = TypeVar{IntersectionTypeVar{{typeChecker.numberType, typeChecker.stringType}}};
auto utv = TypeVar{UnionTypeVar{{&itv, typeChecker.booleanType}}};
CHECK_EQ(toString(&utv), "(number & string) | boolean");
}
TEST_CASE_FIXTURE(Fixture, "functions_are_always_parenthesized_in_unions_or_intersections")
{
auto stringAndNumberPack = TypePackVar{TypePack{{typeChecker.stringType, typeChecker.numberType}}};
auto numberAndStringPack = TypePackVar{TypePack{{typeChecker.numberType, typeChecker.stringType}}};
auto sn2ns = TypeVar{FunctionTypeVar{&stringAndNumberPack, &numberAndStringPack}};
auto ns2sn = TypeVar{FunctionTypeVar(typeChecker.globalScope->level, &numberAndStringPack, &stringAndNumberPack)};
auto utv = TypeVar{UnionTypeVar{{&ns2sn, &sn2ns}}};
auto itv = TypeVar{IntersectionTypeVar{{&ns2sn, &sn2ns}}};
CHECK_EQ(toString(&utv), "((number, string) -> (string, number)) | ((string, number) -> (number, string))");
CHECK_EQ(toString(&itv), "((number, string) -> (string, number)) & ((string, number) -> (number, string))");
}
TEST_CASE_FIXTURE(Fixture, "intersections_respects_use_line_breaks")
{
CheckResult result = check(R"(
local a: ((string) -> string) & ((number) -> number)
)");
ToStringOptions opts;
opts.useLineBreaks = true;
//clang-format off
CHECK_EQ("((number) -> number)\n"
"& ((string) -> string)",
toString(requireType("a"), opts));
//clang-format on
}
TEST_CASE_FIXTURE(Fixture, "unions_respects_use_line_breaks")
{
CheckResult result = check(R"(
local a: string | number | boolean
)");
ToStringOptions opts;
opts.useLineBreaks = true;
//clang-format off
CHECK_EQ("boolean\n"
"| number\n"
"| string",
toString(requireType("a"), opts));
//clang-format on
}
TEST_CASE_FIXTURE(Fixture, "quit_stringifying_table_type_when_length_is_exceeded")
{
TableTypeVar ttv{};
for (char c : std::string("abcdefghijklmno"))
ttv.props[std::string(1, c)] = {typeChecker.numberType};
TypeVar tv{ttv};
ToStringOptions o;
o.exhaustive = false;
o.maxTableLength = 40;
CHECK_EQ(toString(&tv, o), "{ a: number, b: number, c: number, d: number, e: number, ... 10 more ... }");
}
TEST_CASE_FIXTURE(Fixture, "stringifying_table_type_is_still_capped_when_exhaustive")
{
TableTypeVar ttv{};
for (char c : std::string("abcdefg"))
ttv.props[std::string(1, c)] = {typeChecker.numberType};
TypeVar tv{ttv};
ToStringOptions o;
o.exhaustive = true;
o.maxTableLength = 40;
CHECK_EQ(toString(&tv, o), "{ a: number, b: number, c: number, d: number, e: number, ... 2 more ... }");
}
TEST_CASE_FIXTURE(Fixture, "quit_stringifying_type_when_length_is_exceeded")
{
CheckResult result = check(R"(
function f0() end
function f1(f) return f or f0 end
function f2(f) return f or f1 end
function f3(f) return f or f2 end
)");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions o;
o.exhaustive = false;
o.maxTypeLength = 40;
CHECK_EQ(toString(requireType("f0"), o), "() -> ()");
CHECK_EQ(toString(requireType("f1"), o), "(() -> ()) -> () -> ()");
if (FFlag::LuauSpecialTypesAsterisked)
{
CHECK_EQ(toString(requireType("f2"), o), "((() -> ()) -> () -> ()) -> (() -> ()) -> ... *TRUNCATED*");
CHECK_EQ(toString(requireType("f3"), o), "(((() -> ()) -> () -> ()) -> (() -> ()) -> ... *TRUNCATED*");
}
else
{
CHECK_EQ(toString(requireType("f2"), o), "((() -> ()) -> () -> ()) -> (() -> ()) -> ... <TRUNCATED>");
CHECK_EQ(toString(requireType("f3"), o), "(((() -> ()) -> () -> ()) -> (() -> ()) -> ... <TRUNCATED>");
}
}
TEST_CASE_FIXTURE(Fixture, "stringifying_type_is_still_capped_when_exhaustive")
{
CheckResult result = check(R"(
function f0() end
function f1(f) return f or f0 end
function f2(f) return f or f1 end
function f3(f) return f or f2 end
)");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions o;
o.exhaustive = true;
o.maxTypeLength = 40;
CHECK_EQ(toString(requireType("f0"), o), "() -> ()");
CHECK_EQ(toString(requireType("f1"), o), "(() -> ()) -> () -> ()");
if (FFlag::LuauSpecialTypesAsterisked)
{
CHECK_EQ(toString(requireType("f2"), o), "((() -> ()) -> () -> ()) -> (() -> ()) -> ... *TRUNCATED*");
CHECK_EQ(toString(requireType("f3"), o), "(((() -> ()) -> () -> ()) -> (() -> ()) -> ... *TRUNCATED*");
}
else
{
CHECK_EQ(toString(requireType("f2"), o), "((() -> ()) -> () -> ()) -> (() -> ()) -> ... <TRUNCATED>");
CHECK_EQ(toString(requireType("f3"), o), "(((() -> ()) -> () -> ()) -> (() -> ()) -> ... <TRUNCATED>");
}
}
TEST_CASE_FIXTURE(Fixture, "stringifying_table_type_correctly_use_matching_table_state_braces")
{
TableTypeVar ttv{TableState::Sealed, TypeLevel{}};
for (char c : std::string("abcdefghij"))
ttv.props[std::string(1, c)] = {typeChecker.numberType};
TypeVar tv{ttv};
ToStringOptions o;
o.maxTableLength = 40;
CHECK_EQ(toString(&tv, o), "{| a: number, b: number, c: number, d: number, e: number, ... 5 more ... |}");
}
TEST_CASE_FIXTURE(Fixture, "stringifying_cyclic_union_type_bails_early")
{
TypeVar tv{UnionTypeVar{{typeChecker.stringType, typeChecker.numberType}}};
UnionTypeVar* utv = getMutable<UnionTypeVar>(&tv);
utv->options.push_back(&tv);
utv->options.push_back(&tv);
CHECK_EQ("t1 where t1 = number | string", toString(&tv));
}
TEST_CASE_FIXTURE(Fixture, "stringifying_cyclic_intersection_type_bails_early")
{
TypeVar tv{IntersectionTypeVar{}};
IntersectionTypeVar* itv = getMutable<IntersectionTypeVar>(&tv);
itv->parts.push_back(&tv);
itv->parts.push_back(&tv);
CHECK_EQ("t1 where t1 = t1 & t1", toString(&tv));
}
TEST_CASE_FIXTURE(Fixture, "stringifying_array_uses_array_syntax")
{
TableTypeVar ttv{TableState::Sealed, TypeLevel{}};
ttv.indexer = TableIndexer{typeChecker.numberType, typeChecker.stringType};
CHECK_EQ("{string}", toString(TypeVar{ttv}));
ttv.props["A"] = {typeChecker.numberType};
CHECK_EQ("{| [number]: string, A: number |}", toString(TypeVar{ttv}));
ttv.props.clear();
ttv.state = TableState::Unsealed;
CHECK_EQ("{string}", toString(TypeVar{ttv}));
}
TEST_CASE_FIXTURE(Fixture, "generic_packs_are_stringified_differently_from_generic_types")
{
TypePackVar tpv{GenericTypePack{"a"}};
CHECK_EQ(toString(&tpv), "a...");
TypeVar tv{GenericTypeVar{"a"}};
CHECK_EQ(toString(&tv), "a");
}
TEST_CASE_FIXTURE(Fixture, "function_type_with_argument_names")
{
CheckResult result = check("type MyFunc = (a: number, string, c: number) -> string; local a : MyFunc");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions opts;
opts.functionTypeArguments = true;
CHECK_EQ("(a: number, string, c: number) -> string", toString(requireType("a"), opts));
}
TEST_CASE_FIXTURE(Fixture, "function_type_with_argument_names_generic")
{
CheckResult result = check("local function f<a...>(n: number, ...: a...): (a...) return ... end");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions opts;
opts.functionTypeArguments = true;
CHECK_EQ("<a...>(n: number, a...) -> (a...)", toString(requireType("f"), opts));
}
TEST_CASE_FIXTURE(Fixture, "function_type_with_argument_names_and_self")
{
CheckResult result = check(R"(
local tbl = {}
tbl.a = 2
function tbl:foo(b: number, c: number) return (self.a :: number) + b + c end
type Table = typeof(tbl)
type Foo = typeof(tbl.foo)
local u: Foo
)");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions opts;
opts.functionTypeArguments = true;
// Can't guess the name of 'self' to compare name, but at least there should be no assertion
toString(requireType("u"), opts);
}
TEST_CASE_FIXTURE(Fixture, "generate_friendly_names_for_inferred_generics")
{
CheckResult result = check(R"(
function id(x) return x end
function id2(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30)
return a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("<a>(a) -> a", toString(requireType("id")));
CHECK_EQ("<a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a1, b1, c1, d1>(a, b, c, d, e, f, g, h, i, j, k, l, "
"m, n, o, p, q, r, s, t, u, v, w, x, y, z, a1, b1, c1, d1) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, "
"x, y, z, a1, b1, c1, d1)",
toString(requireType("id2")));
}
TEST_CASE_FIXTURE(Fixture, "toStringDetailed")
{
CheckResult result = check(R"(
function id3(a, b, c)
return a, b, c
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions opts;
TypeId id3Type = requireType("id3");
ToStringResult nameData = toStringDetailed(id3Type, opts);
if (FFlag::LuauFixNameMaps)
REQUIRE(3 == opts.nameMap.typeVars.size());
else
REQUIRE_EQ(3, nameData.DEPRECATED_nameMap.typeVars.size());
REQUIRE_EQ("<a, b, c>(a, b, c) -> (a, b, c)", nameData.name);
ToStringOptions opts2; // TODO: delete opts2 when clipping FFlag::LuauFixNameMaps
if (FFlag::LuauFixNameMaps)
opts2.nameMap = std::move(opts.nameMap);
else
opts2.DEPRECATED_nameMap = std::move(nameData.DEPRECATED_nameMap);
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(id3Type));
REQUIRE(ftv != nullptr);
auto params = flatten(ftv->argTypes).first;
REQUIRE(3 == params.size());
CHECK("a" == toString(params[0], opts2));
CHECK("b" == toString(params[1], opts2));
CHECK("c" == toString(params[2], opts2));
}
TEST_CASE_FIXTURE(BuiltinsFixture, "toStringDetailed2")
{
ScopedFastFlag sff[] = {
{"DebugLuauSharedSelf", true},
};
CheckResult result = check(R"(
local base = {}
function base:one() return 1 end
local child = {}
setmetatable(child, {__index=base})
function child:two() return 2 end
local inst = {}
setmetatable(inst, {__index=child})
)");
LUAU_REQUIRE_NO_ERRORS(result);
ToStringOptions opts;
TypeId tType = requireType("inst");
ToStringResult r = toStringDetailed(tType, opts);
CHECK_EQ("{ @metatable { __index: { @metatable {| __index: base |}, child } }, inst }", r.name);
if (FFlag::LuauFixNameMaps)
CHECK(0 == opts.nameMap.typeVars.size());
else
CHECK_EQ(0, r.DEPRECATED_nameMap.typeVars.size());
if (!FFlag::LuauFixNameMaps)
opts.DEPRECATED_nameMap = r.DEPRECATED_nameMap;
const MetatableTypeVar* tMeta = get<MetatableTypeVar>(tType);
REQUIRE(tMeta);
TableTypeVar* tMeta2 = getMutable<TableTypeVar>(tMeta->metatable);
REQUIRE(tMeta2);
REQUIRE(tMeta2->props.count("__index"));
const MetatableTypeVar* tMeta3 = get<MetatableTypeVar>(tMeta2->props["__index"].type);
REQUIRE(tMeta3);
TableTypeVar* tMeta4 = getMutable<TableTypeVar>(tMeta3->metatable);
REQUIRE(tMeta4);
REQUIRE(tMeta4->props.count("__index"));
TableTypeVar* tMeta5 = getMutable<TableTypeVar>(tMeta4->props["__index"].type);
REQUIRE(tMeta5);
TableTypeVar* tMeta6 = getMutable<TableTypeVar>(tMeta3->table);
REQUIRE(tMeta6);
ToStringResult oneResult = toStringDetailed(tMeta5->props["one"].type, opts);
if (!FFlag::LuauFixNameMaps)
opts.DEPRECATED_nameMap = oneResult.DEPRECATED_nameMap;
std::string twoResult = toString(tMeta6->props["two"].type, opts);
CHECK_EQ("<a>(a) -> number", oneResult.name);
CHECK_EQ("<b>(b) -> number", twoResult);
}
TEST_CASE_FIXTURE(Fixture, "toStringErrorPack")
{
CheckResult result = check(R"(
local function target(callback: nil) return callback(4, "hello") end
)");
LUAU_REQUIRE_ERRORS(result);
if (FFlag::LuauSpecialTypesAsterisked)
CHECK_EQ("(nil) -> (*error-type*)", toString(requireType("target")));
else
CHECK_EQ("(nil) -> (<error-type>)", toString(requireType("target")));
}
TEST_CASE_FIXTURE(Fixture, "toStringGenericPack")
{
CheckResult result = check(R"(
function foo(a, b) return a(b) end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("foo")), "<a, b...>((a) -> (b...), a) -> (b...)");
}
TEST_CASE_FIXTURE(Fixture, "toString_the_boundTo_table_type_contained_within_a_TypePack")
{
TypeVar tv1{TableTypeVar{}};
TableTypeVar* ttv = getMutable<TableTypeVar>(&tv1);
ttv->state = TableState::Sealed;
ttv->props["hello"] = {typeChecker.numberType};
ttv->props["world"] = {typeChecker.numberType};
TypePackVar tpv1{TypePack{{&tv1}}};
TypeVar tv2{TableTypeVar{}};
TableTypeVar* bttv = getMutable<TableTypeVar>(&tv2);
bttv->state = TableState::Free;
bttv->props["hello"] = {typeChecker.numberType};
bttv->boundTo = &tv1;
TypePackVar tpv2{TypePack{{&tv2}}};
CHECK_EQ("{| hello: number, world: number |}", toString(&tpv1));
CHECK_EQ("{| hello: number, world: number |}", toString(&tpv2));
}
TEST_CASE_FIXTURE(Fixture, "no_parentheses_around_cyclic_function_type_in_union")
{
CheckResult result = check(R"(
type F = ((() -> number)?) -> F?
local function f(p) return f end
local g: F = f
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("t1 where t1 = ((() -> number)?) -> t1?", toString(requireType("g")));
}
TEST_CASE_FIXTURE(Fixture, "no_parentheses_around_cyclic_function_type_in_intersection")
{
CheckResult result = check(R"(
function f() return f end
local a: ((number) -> ()) & typeof(f)
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("((number) -> ()) & t1 where t1 = () -> t1", toString(requireType("a")));
}
TEST_CASE_FIXTURE(Fixture, "self_recursive_instantiated_param")
{
TypeVar tableTy{TableTypeVar{}};
TableTypeVar* ttv = getMutable<TableTypeVar>(&tableTy);
ttv->name = "Table";
ttv->instantiatedTypeParams.push_back(&tableTy);
CHECK_EQ(toString(tableTy), "Table<Table>");
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_id")
{
CheckResult result = check(R"(
local function id(x) return x end
)");
TypeId ty = requireType("id");
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("id<a>(x: a): a", toStringNamedFunction("id", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_map")
{
CheckResult result = check(R"(
local function map(arr, fn)
local t = {}
for i = 0, #arr do
t[i] = fn(arr[i])
end
return t
end
)");
TypeId ty = requireType("map");
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("map<a, b>(arr: {a}, fn: (a) -> b): {b}", toStringNamedFunction("map", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_generic_pack")
{
CheckResult result = check(R"(
local function f(a: number, b: string) end
local function test<T..., U...>(...: T...): U...
f(...)
return 1, 2, 3
end
)");
TypeId ty = requireType("test");
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("test<T..., U...>(...: T...): U...", toStringNamedFunction("test", *ftv));
}
TEST_CASE("toStringNamedFunction_unit_f")
{
TypePackVar empty{TypePack{}};
FunctionTypeVar ftv{&empty, &empty, {}, false};
CHECK_EQ("f(): ()", toStringNamedFunction("f", ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_variadics")
{
CheckResult result = check(R"(
local function f<a, b...>(x: a, ...): (a, a, b...)
return x, x, ...
end
)");
TypeId ty = requireType("f");
auto ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("f<a, b...>(x: a, ...: any): (a, a, b...)", toStringNamedFunction("f", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_variadics2")
{
CheckResult result = check(R"(
local function f(): ...number
return 1, 2, 3
end
)");
TypeId ty = requireType("f");
auto ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("f(): ...number", toStringNamedFunction("f", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_variadics3")
{
CheckResult result = check(R"(
local function f(): (string, ...number)
return 'a', 1, 2, 3
end
)");
TypeId ty = requireType("f");
auto ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("f(): (string, ...number)", toStringNamedFunction("f", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_type_annotation_has_partial_argnames")
{
CheckResult result = check(R"(
local f: (number, y: number) -> number
)");
TypeId ty = requireType("f");
auto ftv = get<FunctionTypeVar>(follow(ty));
CHECK_EQ("f(_: number, y: number): number", toStringNamedFunction("f", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_hide_type_params")
{
CheckResult result = check(R"(
local function f<T>(x: T, g: <U>(T) -> U)): ()
end
)");
TypeId ty = requireType("f");
auto ftv = get<FunctionTypeVar>(follow(ty));
ToStringOptions opts;
opts.hideNamedFunctionTypeParameters = true;
CHECK_EQ("f(x: T, g: <U>(T) -> U): ()", toStringNamedFunction("f", *ftv, opts));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_overrides_param_names")
{
CheckResult result = check(R"(
local function test(a, b : string, ... : number) return a end
)");
TypeId ty = requireType("test");
const FunctionTypeVar* ftv = get<FunctionTypeVar>(follow(ty));
ToStringOptions opts;
opts.namedFunctionOverrideArgNames = {"first", "second", "third"};
CHECK_EQ("test<a>(first: a, second: string, ...: number): a", toStringNamedFunction("test", *ftv, opts));
}
TEST_CASE_FIXTURE(Fixture, "pick_distinct_names_for_mixed_explicit_and_implicit_generics")
{
CheckResult result = check(R"(
function foo<a>(x: a, y) end
)");
CHECK("<a, b>(a, b) -> ()" == toString(requireType("foo")));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_include_self_param")
{
ScopedFastFlag sff[]{
{"DebugLuauSharedSelf", true},
};
CheckResult result = check(R"(
local foo = {}
function foo:method(arg: string): ()
end
)");
TypeId parentTy = requireType("foo");
auto ttv = get<TableTypeVar>(follow(parentTy));
auto ftv = get<FunctionTypeVar>(ttv->props.at("method").type);
CHECK_EQ("foo:method<a>(self: a, arg: string): ()", toStringNamedFunction("foo:method", *ftv));
}
TEST_CASE_FIXTURE(Fixture, "toStringNamedFunction_hide_self_param")
{
ScopedFastFlag sff[]{
{"DebugLuauSharedSelf", true},
};
CheckResult result = check(R"(
local foo = {}
function foo:method(arg: string): ()
end
)");
TypeId parentTy = requireType("foo");
auto ttv = get<TableTypeVar>(follow(parentTy));
auto ftv = get<FunctionTypeVar>(ttv->props.at("method").type);
ToStringOptions opts;
opts.hideFunctionSelfArgument = true;
CHECK_EQ("foo:method<a>(arg: string): ()", toStringNamedFunction("foo:method", *ftv, opts));
}
TEST_CASE_FIXTURE(Fixture, "tostring_unsee_ttv_if_array")
{
ScopedFastFlag sff("LuauUnseeArrayTtv", true);
CheckResult result = check(R"(
local x: {string}
-- This code is constructed very specifically to use the same (by pointer
-- identity) type in the function twice.
local y: (typeof(x), typeof(x)) -> ()
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK(toString(requireType("y")) == "({string}, {string}) -> ()");
}
TEST_SUITE_END();