symantic-lib/Language/Symantic/Lib/Ratio.hs

   1 {-# LANGUAGE UndecidableInstances #-}
   2 {-# OPTIONS_GHC -fno-warn-orphans #-}
   3 -- | Symantic for 'Ratio'.
   4 module Language.Symantic.Lib.Ratio where
   5
   6 import Data.Ratio (Ratio)
   7 import qualified Data.Ratio as Ratio
   8
   9 import Language.Symantic
  10 import Language.Symantic.Lib.Function (a0)
  11 import Language.Symantic.Lib.Integral (tyIntegral)
  12
  13 -- * Class 'Sym_Ratio'
  14 type instance Sym (Proxy Ratio) = Sym_Ratio
  15 class Sym_Ratio term where
  16         ratio       :: Integral a => term a -> term a -> term (Ratio a)
  17         numerator   :: term (Ratio a) -> term a
  18         denominator :: term (Ratio a) -> term a
  19
  20         default ratio       :: Sym_Ratio (UnT term) => Trans term => Integral a => term a -> term a -> term (Ratio a)
  21         default numerator   :: Sym_Ratio (UnT term) => Trans term               => term (Ratio a) -> term a
  22         default denominator :: Sym_Ratio (UnT term) => Trans term               => term (Ratio a) -> term a
  23
  24         ratio       = trans2 ratio
  25         numerator   = trans1 numerator
  26         denominator = trans1 denominator
  27
  28 -- Interpreting
  29 instance Sym_Ratio Eval where
  30         ratio       = eval2 (Ratio.%)
  31         numerator   = eval1 Ratio.numerator
  32         denominator = eval1 Ratio.denominator
  33 instance Sym_Ratio View where
  34         ratio       = viewInfix "ratio" (infixL 7)
  35         numerator   = view1 "numerator"
  36         denominator = view1 "denominator"
  37 instance (Sym_Ratio r1, Sym_Ratio r2) => Sym_Ratio (Dup r1 r2) where
  38         ratio       = dup2 @Sym_Ratio ratio
  39         numerator   = dup1 @Sym_Ratio numerator
  40         denominator = dup1 @Sym_Ratio denominator
  41
  42 -- Transforming
  43 instance (Sym_Ratio term, Sym_Lambda term) => Sym_Ratio (BetaT term)
  44
  45 -- Typing
  46 instance FixityOf Ratio
  47 instance ClassInstancesFor Ratio where
  48         proveConstraintFor _ (TyApp _ tq@(TyConst _ _ q) (TyApp _ c a))
  49          | Just HRefl <- proj_ConstKiTy @_ @Ratio c
  50          = case () of
  51                  _ | Just Refl <- proj_Const @Eq q
  52                    , Just Dict <- proveConstraint (tq `tyApp` a) -> Just Dict
  53                    | Just Refl <- proj_Const @Show q
  54                    , Just Dict <- proveConstraint (tq `tyApp` a) -> Just Dict
  55                    | Just Refl <- proj_Const @Real q
  56                    , Just Dict <- proveConstraint (tyIntegral a) -> Just Dict
  57                    | Just Refl <- proj_Const @Ord q
  58                    , Just Dict <- proveConstraint (tyIntegral a) -> Just Dict
  59                    | Just Refl <- proj_Const @Fractional q
  60                    , Just Dict <- proveConstraint (tyIntegral a) -> Just Dict
  61                    | Just Refl <- proj_Const @Num q
  62                    , Just Dict <- proveConstraint (tyIntegral a) -> Just Dict
  63                    | Just Refl <- proj_Const @RealFrac q
  64                    , Just Dict <- proveConstraint (tyIntegral a) -> Just Dict
  65                  _ -> Nothing
  66         proveConstraintFor _c _q = Nothing
  67 instance TypeInstancesFor Ratio
  68
  69 -- Compiling
  70 instance Gram_Term_AtomsFor src ss g Ratio
  71 instance (Source src, Inj_Sym ss Ratio) => ModuleFor src ss Ratio where
  72         moduleFor _s = ["Ratio"] `moduleWhere`
  73          [ "ratio"       := teRatio
  74          , "numerator"   := teRatio_numerator
  75          , "denominator" := teRatio_denominator
  76          ]
  77
  78 -- ** 'Type's
  79 tyRatio :: Source src => Type src vs a -> Type src vs (Ratio a)
  80 tyRatio a = tyConstLen @(K Ratio) @Ratio (lenVars a) `tyApp` a
  81
  82 -- ** 'Term's
  83 teRatio :: TermDef Ratio '[Proxy a] (Integral a #> (a -> a -> Ratio a))
  84 teRatio = Term (tyIntegral a0) (a0 ~> a0 ~> tyRatio a0) $ teSym @Ratio $ lam2 ratio
  85
  86 teRatio_numerator, teRatio_denominator :: TermDef Ratio '[Proxy a] (() #> (Ratio a -> a))
  87 teRatio_numerator   = Term noConstraint (tyRatio a0 ~> a0) $ teSym @Ratio $ lam1 numerator
  88 teRatio_denominator = Term noConstraint (tyRatio a0 ~> a0) $ teSym @Ratio $ lam1 denominator