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 lam
  36  .|. Expr_List lam
  37  .|. Expr_Maybe lam
  38  .|. Expr_Int
  39  .|. Expr_Bool
  40  .|. Expr_Functor lam
  41  .|. Expr_Applicative lam
  42  )
  43 ex_from = root_expr_from (Proxy::Proxy (Ex lam)) (Proxy::Proxy lam)
  44
  45 (==>) ast expected =
  46         testCase (show ast) $
  47         case ex_from ast of
  48          Left err -> Left err @?= snd `left` expected
  49          Right (Exists_Type_and_Repr ty (Forall_Repr r)) ->
  50                 case expected of
  51                  Left (_, err) -> Right ("…"::String) @?= Left err
  52                  Right (ty_expected::Type_Root_of_Expr (Ex IO) h, _::h, _::Text) ->
  53                         (>>= (@?= (\(_::Proxy h, err) -> err) `left` expected)) $
  54                         case ty `eq_type` ty_expected of
  55                          Nothing -> return $ Left $
  56                                 error_expr (Proxy::Proxy (Ex IO)) $
  57                                 Error_Expr_Type_mismatch ast
  58                                  (Exists_Type ty)
  59                                  (Exists_Type ty_expected)
  60                          Just Refl -> do
  61                                 h <- host_from_expr r
  62                                 return $
  63                                         Right
  64                                          ( ty
  65                                          , h
  66                                          , text_from_expr r
  67                                          -- , (text_from_expr :: Repr_String IO h -> Text) r
  68                                          )
  69
  70 tests :: TestTree
  71 tests = testGroup "Applicative"
  72  [ AST "<*>"
  73          [ AST "<$>"
  74                  [ AST "val"
  75                          [ AST "x" [], AST "Int" []
  76                          , AST "val"
  77                                  [ AST "y" [], AST "Int" []
  78                                  , AST "+" [ AST "var" [AST "x" []]
  79                                            , AST "var" [AST "y" []] ]
  80                                  ]
  81                          ]
  82                  , AST "just" [ AST "int" [AST "1" []] ]
  83                  ]
  84          , AST "just" [ AST "int" [AST "2" []] ]
  85          ] ==> Right
  86          ( type_maybe type_int
  87          , Just 3
  88          , "fmap (\\x0 -> (\\x1 -> x0 + x1)) (just 1) <*> just 2" )
  89  ]