Language/Symantic/Lib/Bool.hs

   1 {-# LANGUAGE UndecidableInstances #-}
   2 {-# OPTIONS_GHC -fno-warn-orphans #-}
   3 -- | Symantic for 'Bool'.
   4 module Language.Symantic.Lib.Bool where
   5
   6 import Control.Monad
   7 import qualified Data.Bool as Bool
   8 import Data.Proxy
   9 import qualified Data.Text as Text
  10 import Data.Type.Equality ((:~:)(Refl))
  11 import Prelude hiding ((&&), not, (||))
  12
  13 import Language.Symantic.Parsing
  14 import Language.Symantic.Typing
  15 import Language.Symantic.Compiling
  16 import Language.Symantic.Interpreting
  17 import Language.Symantic.Transforming
  18 import Language.Symantic.Lib.Lambda
  19
  20 -- * Class 'Sym_Bool'
  21 class Sym_Bool term where
  22         bool ::      Bool -> term Bool
  23         not  :: term Bool -> term Bool
  24         (&&) :: term Bool -> term Bool -> term Bool
  25         (||) :: term Bool -> term Bool -> term Bool
  26         xor  :: term Bool -> term Bool -> term Bool
  27         xor x y = (x || y) && not (x && y)
  28
  29         default bool :: Trans t term =>        Bool -> t term Bool
  30         default not  :: Trans t term => t term Bool -> t term Bool
  31         default (&&) :: Trans t term => t term Bool -> t term Bool -> t term Bool
  32         default (||) :: Trans t term => t term Bool -> t term Bool -> t term Bool
  33
  34         bool = trans_lift . bool
  35         not  = trans_map1 not
  36         (&&) = trans_map2 (&&)
  37         (||) = trans_map2 (||)
  38
  39 infixr 2 ||
  40 infixr 2 `xor`
  41 infixr 3 &&
  42
  43 type instance Sym_of_Iface (Proxy Bool) = Sym_Bool
  44 type instance Consts_of_Iface (Proxy Bool) = Proxy Bool ': Consts_imported_by Bool
  45 type instance Consts_imported_by Bool =
  46  [ Proxy Bounded
  47  , Proxy Enum
  48  , Proxy Eq
  49  , Proxy Ord
  50  , Proxy Show
  51  ]
  52
  53 instance Sym_Bool HostI where
  54         bool = HostI
  55         not  = liftM Bool.not
  56         (&&) = liftM2 (Bool.&&)
  57         (||) = liftM2 (Bool.||)
  58 instance Sym_Bool TextI where
  59         bool o = TextI $ \_p _v ->
  60                 Text.pack (show o)
  61         not  = textI1 "not"
  62         (&&) = textI_infix "&&"    (infixR 3)
  63         (||) = textI_infix "||"    (infixR 2)
  64         xor  = textI_infix "`xor`" (infixR 2)
  65 instance (Sym_Bool r1, Sym_Bool r2) => Sym_Bool (DupI r1 r2) where
  66         bool b = bool b `DupI` bool b
  67         not  = dupI1 (Proxy @Sym_Bool) not
  68         (&&) = dupI2 (Proxy @Sym_Bool) (&&)
  69         (||) = dupI2 (Proxy @Sym_Bool) (||)
  70         xor  = dupI2 (Proxy @Sym_Bool) xor
  71
  72 instance
  73  ( Read_TypeNameR Type_Name cs rs
  74  , Inj_Const cs Bool
  75  ) => Read_TypeNameR Type_Name cs (Proxy Bool ': rs) where
  76         read_typenameR _cs (Type_Name "Bool") k = k (ty @Bool)
  77         read_typenameR _rs raw k = read_typenameR (Proxy @rs) raw k
  78 instance Show_Const cs => Show_Const (Proxy Bool ': cs) where
  79         show_const ConstZ{} = "Bool"
  80         show_const (ConstS c) = show_const c
  81
  82 instance -- Proj_ConC
  83  ( Proj_Const cs Bool
  84  , Proj_Consts cs (Consts_imported_by Bool)
  85  ) => Proj_ConC cs (Proxy Bool) where
  86         proj_conC _ (TyConst q :$ TyConst c)
  87          | Just Refl <- eq_skind (kind_of_const c) SKiType
  88          , Just Refl <- proj_const c (Proxy @Bool)
  89          = case () of
  90                  _ | Just Refl <- proj_const q (Proxy @Bounded) -> Just Con
  91                    | Just Refl <- proj_const q (Proxy @Enum)    -> Just Con
  92                    | Just Refl <- proj_const q (Proxy @Eq)      -> Just Con
  93                    | Just Refl <- proj_const q (Proxy @Ord)     -> Just Con
  94                    | Just Refl <- proj_const q (Proxy @Show)    -> Just Con
  95                  _ -> Nothing
  96         proj_conC _c _q = Nothing
  97 data instance TokenT meta (ts::[*]) (Proxy Bool)
  98  = Token_Term_Bool Bool
  99  | Token_Term_Bool_not
 100  | Token_Term_Bool_and
 101  | Token_Term_Bool_or
 102  | Token_Term_Bool_xor
 103 deriving instance Eq_Token meta ts => Eq (TokenT meta ts (Proxy Bool))
 104 deriving instance Show_Token meta ts => Show (TokenT meta ts (Proxy Bool))
 105 instance -- CompileI
 106  ( Inj_Const (Consts_of_Ifaces is) Bool
 107  , Inj_Const (Consts_of_Ifaces is) (->)
 108  ) => CompileI is (Proxy Bool) where
 109         compileI tok _ctx k =
 110                 case tok of
 111                  Token_Term_Bool b -> k (ty @Bool) $ TermO $ \_c -> bool b
 112                  Token_Term_Bool_not -> op1_from not
 113                  Token_Term_Bool_and -> op2_from (&&)
 114                  Token_Term_Bool_or  -> op2_from (||)
 115                  Token_Term_Bool_xor -> op2_from xor
 116                 where
 117                 op1_from
 118                  (op::forall term. Sym_Bool term => term Bool -> term Bool) =
 119                         k (ty @Bool ~> ty @Bool) $ TermO $ \_c -> lam op
 120                 op2_from
 121                         (op::forall term. Sym_Bool term => term Bool -> term Bool -> term Bool) =
 122                         k (ty @Bool ~> ty @Bool ~> ty @Bool) $ TermO $ \_c -> lam $ lam . op
 123 instance -- TokenizeT
 124  Inj_Token meta ts Bool =>
 125  TokenizeT meta ts (Proxy Bool) where
 126         tokenizeT _t = mempty
 127          { tokenizers_infix = tokenizeTMod []
 128                  [ tokenize0 "False" infixN5 $  Token_Term_Bool False
 129                  , tokenize0 "True"  infixN5 $  Token_Term_Bool True
 130                  , tokenize0 "not"   infixN5    Token_Term_Bool_not
 131                  , tokenize0 "and"   (infixR 3) Token_Term_Bool_and
 132                  , tokenize0 "or"    (infixR 2) Token_Term_Bool_or
 133                  , tokenize0 "xor"   (infixR 2) Token_Term_Bool_xor
 134                  ]
 135          }
 136 instance Gram_Term_AtomsT meta ts (Proxy Bool) g