59 lines
2 KiB
Standard ML
59 lines
2 KiB
Standard ML
open TypeInference
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let tests_typeof =
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let x = Identifier.fresh () in
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let y = Identifier.fresh () in
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let z = Identifier.fresh () in
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[ (* IntConst *)
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"0", Term.IntConst 0, Some Type.Int
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; (* int -> int -> int = <fun> *)
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( "fun x -> fun y -> x + y"
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, Term.(Fun (x, Fun (y, Binop (Var x, Plus, Var y))))
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, Some Type.(Arrow (Int, Arrow (Int, Int))) )
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; (* Not typed variable *)
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"x", Term.(Var "x"), Some (Type.Var "x")
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; (* Binary operation *)
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"1 + 2", Term.(Binop (IntConst 1, Plus, IntConst 2)), Some Type.Int
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; (* Pair *)
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"(1, 2)", Term.(Pair (IntConst 1, IntConst 2)), Some Type.(Product (Int, Int))
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; (* Projection with first *)
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"fst (1, 2)", Term.(Proj (First, Pair (IntConst 1, IntConst 2))), Some Type.Int
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; (* Projection with second *)
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"snd (1, 2)", Term.(Proj (Second, Pair (IntConst 1, IntConst 2))), Some Type.Int
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; (* Apply (int) into (fun : int -> int) *)
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( "(fun x -> x + 1) 5"
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, Term.(App (Fun (x, Binop (Var x, Plus, IntConst 1)), IntConst 5))
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, Some Type.Int )
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; (* Apply product (int * int) into a not compatible function (fun : int -> int) *)
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( "(fun x -> x + 1) (1, 2)"
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, Term.(App (Fun (x, Binop (Var x, Plus, IntConst 1)), Pair (IntConst 1, IntConst 2)))
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, None )
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; (* x -> y -> (x -> y -> z) -> z *)
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( "fun x y -> fun z -> z x y"
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, Term.(Fun (x, Fun (y, Fun (z, App (Var z, App (Var x, Var y))))))
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, Some
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Type.(
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Arrow (Var x, Arrow (Var y, Arrow (Arrow (Var x, Arrow (Var y, Var z)), Var z))))
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)
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]
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;;
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let typeModule = (module Type : Alcotest.TESTABLE with type t = Type.t)
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let check_typeof term_text term expected_type =
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let open Alcotest in
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test_case term_text `Quick (fun () ->
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check (option typeModule) "Same type" expected_type (Inference.typeof term))
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;;
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let () =
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let open Alcotest in
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run
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"Inference"
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[ ( "typeof"
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, List.map
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(fun (term_text, term, expected_type) ->
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check_typeof term_text term expected_type)
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tests_typeof )
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]
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;;
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