Language/Symantic/Expr/Applicative/Test.hs

   1 {-# LANGUAGE FlexibleContexts #-}
   2 {-# LANGUAGE FlexibleInstances #-}
   3 {-# LANGUAGE GADTs #-}
   4 {-# LANGUAGE NoMonomorphismRestriction #-}
   5 {-# LANGUAGE ScopedTypeVariables #-}
   6 {-# LANGUAGE TypeOperators #-}
   7 {-# OPTIONS_GHC -fno-warn-missing-signatures #-}
   8
   9 module Expr.Applicative.Test where
  10
  11 import Test.Tasty
  12 import Test.Tasty.HUnit
  13
  14 import Control.Arrow (left)
  15 import Data.Proxy (Proxy(..))
  16 import Data.Text (Text)
  17 import Data.Type.Equality ((:~:)(Refl))
  18 import Prelude hiding ((&&), not, (||), (==), (<$>), (+), Applicative(..))
  19
  20 import Language.Symantic.Type
  21 import Language.Symantic.Expr as Expr
  22 import Language.Symantic.Repr
  23
  24 import AST.Test
  25
  26 -- * Expressions
  27 t = bool True
  28 f = bool False
  29 e1 = val (\x -> val $ \y -> x + y)
  30  <$> just (int 1)
  31  <*> just (int 2)
  32
  33 -- * Tests
  34 type Ex lam = Expr_Root
  35  (   Expr_Lambda_App lam
  36  .|. Expr_Lambda_Val lam
  37  .|. Expr_List lam
  38  .|. Expr_Maybe lam
  39  .|. Expr_Int
  40  .|. Expr_Bool
  41  .|. Expr_Functor lam
  42  .|. Expr_Applicative lam
  43  )
  44 ex_from = root_expr_from (Proxy::Proxy (Ex lam)) (Proxy::Proxy lam)
  45
  46 (==>) ast expected =
  47         testCase (show ast) $
  48         case ex_from ast of
  49          Left err -> Left err @?= snd `left` expected
  50          Right (Exists_Type_and_Repr ty (Forall_Repr r)) ->
  51                 case expected of
  52                  Left (_, err) -> Right ("…"::String) @?= Left err
  53                  Right (ty_expected::Type_Root_of_Expr (Ex IO) h, _::h, _::Text) ->
  54                         (>>= (@?= (\(_::Proxy h, err) -> err) `left` expected)) $
  55                         case ty `eq_type` ty_expected of
  56                          Nothing -> return $ Left $
  57                                 error_expr (Proxy::Proxy (Ex IO)) $
  58                                 Error_Expr_Type_mismatch ast
  59                                  (Exists_Type ty)
  60                                  (Exists_Type ty_expected)
  61                          Just Refl -> do
  62                                 h <- host_from_expr r
  63                                 return $
  64                                         Right
  65                                          ( ty
  66                                          , h
  67                                          , text_from_expr r
  68                                          -- , (text_from_expr :: Repr_String IO h -> Text) r
  69                                          )
  70
  71 tests :: TestTree
  72 tests = testGroup "Applicative"
  73  [ AST "<*>"
  74          [ AST "<$>"
  75                  [ AST "val"
  76                          [ AST "x" [], AST "Int" []
  77                          , AST "val"
  78                                  [ AST "y" [], AST "Int" []
  79                                  , AST "+" [ AST "var" [AST "x" []]
  80                                            , AST "var" [AST "y" []] ]
  81                                  ]
  82                          ]
  83                  , AST "just" [ AST "int" [AST "1" []] ]
  84                  ]
  85          , AST "just" [ AST "int" [AST "2" []] ]
  86          ] ==> Right
  87          ( type_maybe type_int
  88          , Just 3
  89          , "fmap (\\x0 -> (\\x1 -> x0 + x1)) (just 1) <*> just 2" )
  90  ]