Language/Symantic/Compiling/Char.hs

   1 {-# LANGUAGE DataKinds #-}
   2 {-# LANGUAGE DefaultSignatures #-}
   3 {-# LANGUAGE FlexibleContexts #-}
   4 {-# LANGUAGE FlexibleInstances #-}
   5 {-# LANGUAGE MultiParamTypeClasses #-}
   6 {-# LANGUAGE OverloadedStrings #-}
   7 {-# LANGUAGE Rank2Types #-}
   8 {-# LANGUAGE ScopedTypeVariables #-}
   9 {-# LANGUAGE TypeFamilies #-}
  10 {-# LANGUAGE TypeOperators #-}
  11 {-# LANGUAGE UndecidableInstances #-}
  12 {-# OPTIONS_GHC -fno-warn-orphans #-}
  13 -- | Symantic for 'Char'.
  14 module Language.Symantic.Compiling.Char where
  15
  16 import Control.Monad (liftM)
  17 import qualified Data.Char as Char
  18 import qualified Data.Function as Fun
  19 import Data.Proxy
  20 import Data.String (IsString)
  21 import Data.Text (Text)
  22 import qualified Data.Text as Text
  23 import Data.Type.Equality ((:~:)(Refl))
  24
  25 import Language.Symantic.Typing
  26 import Language.Symantic.Compiling.Term
  27 import Language.Symantic.Interpreting
  28 import Language.Symantic.Transforming.Trans
  29
  30 -- * Class 'Sym_Char'
  31 class Sym_Char term where
  32         char :: Char -> term Char
  33         char_toUpper :: term Char -> term Char
  34
  35         default char :: Trans t term => Char -> t term Char
  36         default char_toUpper :: Trans t term => t term Char -> t term Char
  37
  38         char = trans_lift . char
  39         char_toUpper = trans_map1 char_toUpper
  40
  41 type instance Sym_of_Iface (Proxy Char) = Sym_Char
  42 type instance Consts_of_Iface (Proxy Char) = Proxy Char ': Consts_imported_by Char
  43 type instance Consts_imported_by Char =
  44  [ Proxy Bounded
  45  , Proxy Enum
  46  , Proxy Eq
  47  , Proxy Ord
  48  ]
  49
  50 instance Sym_Char HostI where
  51         char = HostI
  52         char_toUpper = liftM Char.toUpper
  53 instance Sym_Char TextI where
  54         char a = TextI $ \_p _v ->
  55                 Text.pack (show a)
  56         char_toUpper = textI_app1 "Char.toUpper"
  57 instance (Sym_Char r1, Sym_Char r2) => Sym_Char (DupI r1 r2) where
  58         char x = char x `DupI` char x
  59         char_toUpper = dupI1 sym_Char char_toUpper
  60
  61 instance Const_from Text cs => Const_from Text (Proxy Char ': cs) where
  62         const_from "Char" k = k (ConstZ kind)
  63         const_from s k = const_from s $ k . ConstS
  64 instance Show_Const cs => Show_Const (Proxy Char ': cs) where
  65         show_const ConstZ{} = "Char"
  66         show_const (ConstS c) = show_const c
  67
  68 instance -- Proj_ConC
  69  ( Proj_Const cs Char
  70  , Proj_Consts cs (Consts_imported_by Char)
  71  ) => Proj_ConC cs (Proxy Char) where
  72         proj_conC _ (TyConst q :$ TyConst c)
  73          | Just Refl <- eq_skind (kind_of_const c) SKiType
  74          , Just Refl <- proj_const c (Proxy::Proxy Char)
  75          = case () of
  76                  _ | Just Refl <- proj_const q (Proxy::Proxy Bounded) -> Just Con
  77                    | Just Refl <- proj_const q (Proxy::Proxy Enum)    -> Just Con
  78                    | Just Refl <- proj_const q (Proxy::Proxy Eq)      -> Just Con
  79                    | Just Refl <- proj_const q (Proxy::Proxy Ord)     -> Just Con
  80                  _ -> Nothing
  81         proj_conC _c _q = Nothing
  82 instance -- Term_fromI
  83  ( AST ast
  84  , Lexem ast ~ LamVarName
  85  , Inj_Const (Consts_of_Ifaces is) Char
  86  , Inj_Const (Consts_of_Ifaces is) (->)
  87  , Show_Const (Consts_of_Ifaces is)
  88  ) => Term_fromI is (Proxy Char) ast where
  89         term_fromI ast _ctx k =
  90                 case ast_lexem ast of
  91                  "char" -> char_from
  92                  "Char.toUpper" -> char_toUpper_from
  93                  _ -> Left $ Error_Term_unsupported
  94                 where
  95                 char_from =
  96                         let ty = tyChar in
  97                         from_ast1 ast $ \ast_lit as ->
  98                         from_lex (Text.pack $ show_type ty) ast_lit $ \(lit::Char) ->
  99                         k as ty $ TermLC $ Fun.const $ char lit
 100                 char_toUpper_from =
 101                         from_ast0 ast $ \_ as ->
 102                         k as (tyChar ~> tyChar) $ TermLC $
 103                         Fun.const $ lam char_toUpper
 104
 105 -- | The 'Char' 'Type'
 106 tyChar :: Inj_Const cs Char => Type cs Char
 107 tyChar = TyConst inj_const
 108
 109 sym_Char :: Proxy Sym_Char
 110 sym_Char = Proxy
 111
 112 syChar :: IsString a => Syntax a
 113 syChar = Syntax "Char" []