110 lines
4 KiB
Haskell
110 lines
4 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
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{-# HLINT ignore "Use <$>" #-}
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{-# HLINT ignore "Use camelCase" #-}
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module Main where
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import Data.Either (isLeft, isRight)
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import Data.Map (Map)
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import Data.Map qualified as M
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import Grammar.Abs
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import Test.Hspec
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import Test.QuickCheck
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import TypeChecker.TypeChecker
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import TypeChecker.TypeCheckerIr (
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Ctx (..),
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Env (..),
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Error,
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Infer,
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Poly (..),
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)
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import TypeChecker.TypeCheckerIr qualified as T
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main :: IO ()
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main = hspec $ do
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infer_elit
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infer_eann
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infer_eid
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infer_eabs
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test_id_function
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infer_elit = describe "algoW used on ELit" $ do
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it "infers the type mono Int" $ do
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getType (ELit (LInt 0)) `shouldBe` Right (T.TLit "Int")
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it "infers the type mono Int" $ do
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getType (ELit (LInt 9999)) `shouldBe` Right (T.TLit "Int")
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infer_eann = describe "algoW used on EAnn" $ do
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it "infers the type and checks if the annotated type matches" $ do
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getType (EAnn (ELit $ LInt 0) (TLit "Int")) `shouldBe` Right (T.TLit "Int")
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it "fails if the annotated type does not match with the inferred type" $ do
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getType (EAnn (ELit $ LInt 0) (TVar $ MkTVar "a")) `shouldSatisfy` isLeft
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it "should be possible to annotate with a more specific type" $ do
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let annotated_lambda = EAnn (EAbs "x" (EVar "x")) (TFun (TLit "Int") (TLit "Int"))
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in getType annotated_lambda `shouldBe` Right (T.TFun (T.TLit "Int") (T.TLit "Int"))
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it "should fail if the annotated type is more general than the inferred type" $ do
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getType (EAnn (ELit (LInt 0)) (TVar $ MkTVar "a")) `shouldSatisfy` isLeft
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it "should fail if the annotated type is an arrow but the annotated type is not" $ do
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getType (EAnn (EAbs "x" (EVar "x")) (TVar $ MkTVar "a")) `shouldSatisfy` isLeft
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infer_eid = describe "algoW used on EVar" $ do
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it "should fail if the variable is not added to the environment" $ do
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property $ \x -> getType (EVar (LIdent (x :: String))) `shouldSatisfy` isLeft
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it "should succeed if the type exist in the environment" $ do
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property $ \x -> do
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let env = Env 0 mempty mempty
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let t = T.TVar $ T.MkTVar "a"
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let ctx = Ctx (M.singleton (Ident (x :: String)) t)
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getTypeC env ctx (EVar (LIdent x)) `shouldBe` Right (T.TVar $ T.MkTVar "a")
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infer_eabs = describe "algoW used on EAbs" $ do
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it "should infer the argument type as int if the variable is used as an int" $ do
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let lambda = EAbs "x" (EAdd (EVar "x") (ELit (LInt 0)))
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getType lambda `shouldBe` Right (T.TFun (T.TLit "Int") (T.TLit "Int"))
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it "should infer the argument type as polymorphic if it is not used in the lambda" $ do
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let lambda = EAbs "x" (ELit (LInt 0))
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getType lambda `shouldSatisfy` isArrowPolyToMono
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it "should infer a variable as function if used as one" $ do
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let lambda = EAbs "f" (EAbs "x" (EApp (EVar "f") (EVar "x")))
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let isOk (Right (T.TFun (T.TFun (T.TVar _) (T.TVar _)) (T.TFun (T.TVar _) (T.TVar _)))) = True
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isOk _ = False
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getType lambda `shouldSatisfy` isOk
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churf_id :: Bind
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churf_id = Bind "id" ["x"] (EVar "x")
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churf_add :: Bind
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churf_add = Bind "add" ["x", "y"] (EAdd (EVar "x") (EVar "y"))
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churf_main :: Bind
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churf_main = Bind "main" [] (EApp (EApp (EVar "id") (EVar "add")) (ELit (LInt 0)))
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prg = Program [DBind churf_main, DBind churf_add, DBind churf_id]
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test_id_function :: SpecWith ()
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test_id_function =
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describe "typechecking a program with id, add and main, where id is applied to add in main" $ do
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it "should succeed to find the correct type" $ do
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typecheck prg `shouldSatisfy` isRight
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isArrowPolyToMono :: Either Error T.Type -> Bool
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isArrowPolyToMono (Right (T.TFun (T.TVar _) (T.TLit _))) = True
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isArrowPolyToMono _ = False
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-- | Empty environment
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getType :: Exp -> Either Error T.Type
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getType e = pure snd <*> run (inferExp e)
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-- | Custom environment
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getTypeC :: Env -> Ctx -> Exp -> Either Error T.Type
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getTypeC env ctx e = pure snd <*> runC env ctx (inferExp e)
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