82 lines
1.8 KiB
Haskell
82 lines
1.8 KiB
Haskell
{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE PartialTypeSignatures #-}
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module Gyehoek.Syntax where
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import Data.Text (Text)
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import Data.List (List)
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import Language.SexpGrammar as Sexp hiding (List)
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import Language.SexpGrammar.Generic
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import GHC.Generics
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import Prelude hiding ((.), id)
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import Control.Category
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import Data.List.NonEmpty (NonEmpty ((:|)))
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import Gyehoek.Sexp qualified
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import Control.Lens (Each)
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type Name = Text
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data Prim e
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= PrimAdd e e
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| PrimSub e e
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| PrimMul e e
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| PrimDiv e e
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| PrimCons e e
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deriving (Show, Generic, Functor, Foldable, Traversable)
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instance Each (Prim e) (Prim e') e e'
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data Lit
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= LitInt Int
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| LitNil
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| LitBool Bool
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deriving (Show, Generic)
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data Exp
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= ExpLet (NonEmpty (Name, Exp)) Exp
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| ExpApply Exp (List Exp)
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| ExpBegin (List Exp)
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| ExpLit Lit
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| ExpPrim (Prim Exp)
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| ExpLambda (List Name) Exp
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| ExpVar Name
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deriving (Show, Generic)
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instance SexpIso a => SexpIso (Prim a) where
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sexpIso = match
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$ With (. binop "prim:+")
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$ With (. binop "prim:-")
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$ With (. binop "prim:*")
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$ With (. binop "prim:/")
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$ With (. binop "prim:cons")
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$ End
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where
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binop s = list $ el (sym s) >>> el sexpIso >>> el sexpIso
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instance SexpIso Lit where
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sexpIso = match
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$ With (. sexpIso)
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$ With (. sym "nil")
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$ With (. sexpIso)
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$ End
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instance SexpIso Exp where
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sexpIso = match
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$ With (. Gyehoek.Sexp.let_ symbol sexpIso sexpIso)
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$ With (\app -> app . list (el sexpIso >>> rest sexpIso))
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$ With (\bgn -> bgn . list (el (sym "begin") >>> rest sexpIso))
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$ With (. sexpIso)
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$ With (. sexpIso)
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$ With (. lam)
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$ With (. symbol)
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$ End
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where
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lam = list
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( el (sym "lambda")
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>>> el (sexpIso @(List Name))
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>>> el sexpIso )
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