Language/Symantic/Expr/Applicative/Test.hs

   1 {-# LANGUAGE FlexibleContexts #-}
   2 {-# LANGUAGE GADTs #-}
   3 {-# LANGUAGE NoMonomorphismRestriction #-}
   4 {-# LANGUAGE ScopedTypeVariables #-}
   5 {-# LANGUAGE TypeOperators #-}
   6 {-# OPTIONS_GHC -fno-warn-missing-signatures #-}
   7
   8 module Expr.Applicative.Test where
   9
  10 import Test.Tasty
  11 import Test.Tasty.HUnit
  12
  13 import Control.Arrow (left)
  14 import Data.Proxy (Proxy(..))
  15 import Data.Text (Text)
  16 import Data.Type.Equality ((:~:)(Refl))
  17 import Prelude hiding ((&&), not, (||), (==), (<$>), (+), Applicative(..))
  18
  19 import Language.Symantic.Type
  20 import Language.Symantic.Expr as Expr
  21 import Language.Symantic.Repr
  22
  23 import AST.Test
  24
  25 -- * Expressions
  26 t = bool True
  27 f = bool False
  28 e1 = val (\x -> val $ \y -> x + y)
  29  <$> just (int 1)
  30  <*> just (int 2)
  31
  32 -- * Tests
  33 type Ex lam = Expr_Root
  34  (   Expr_Lambda lam
  35  .|. Expr_List lam
  36  .|. Expr_Maybe lam
  37  .|. Expr_Int
  38  .|. Expr_Bool
  39  .|. Expr_Functor lam
  40  .|. Expr_Applicative lam
  41  )
  42 ex_from = root_expr_from (Proxy::Proxy (Ex lam)) (Proxy::Proxy lam)
  43
  44 (==>) ast expected =
  45         testCase (show ast) $
  46         case ex_from ast of
  47          Left err -> Left err @?= snd `left` expected
  48          Right (Exists_Type_and_Repr ty (Forall_Repr r)) ->
  49                 case expected of
  50                  Left (_, err) -> Right ("…"::String) @?= Left err
  51                  Right (ty_expected::Type_Root_of_Expr (Ex IO) h, _::h, _::Text) ->
  52                         (>>= (@?= (\(_::Proxy h, err) -> err) `left` expected)) $
  53                         case ty `eq_type` ty_expected of
  54                          Nothing -> return $ Left $
  55                                 error_expr (Proxy::Proxy (Ex IO)) $
  56                                 Error_Expr_Type_mismatch ast
  57                                  (Exists_Type ty)
  58                                  (Exists_Type ty_expected)
  59                          Just Refl -> do
  60                                 h <- host_from_expr r
  61                                 return $
  62                                         Right
  63                                          ( ty
  64                                          , h
  65                                          , text_from_expr r
  66                                          -- , (text_from_expr :: Repr_String IO h -> Text) r
  67                                          )
  68
  69 tests :: TestTree
  70 tests = testGroup "Applicative"
  71  [ AST "<*>"
  72          [ AST "<$>"
  73                  [ AST "val"
  74                          [ AST "x" [], AST "Int" []
  75                          , AST "val"
  76                                  [ AST "y" [], AST "Int" []
  77                                  , AST "+" [ AST "var" [AST "x" []]
  78                                            , AST "var" [AST "y" []] ]
  79                                  ]
  80                          ]
  81                  , AST "just" [ AST "int" [AST "1" []] ]
  82                  ]
  83          , AST "just" [ AST "int" [AST "2" []] ]
  84          ] ==> Right
  85          ( type_maybe type_int
  86          , Just 3
  87          , "fmap (\\x0 -> (\\x1 -> x0 + x1)) (just 1) <*> just 2" )
  88  ]