85 lines
1.6 KiB
Idris
85 lines
1.6 KiB
Idris
module Quox.Syntax.Qty
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import Quox.Pretty
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import Data.Fin
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import Generics.Derive
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%default total
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%language ElabReflection
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public export
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data Qty = Zero | One | Any
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%name Qty.Qty pi, rh
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%runElab derive "Qty" [Generic, Meta, Eq, Ord, DecEq, Show]
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export
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PrettyHL Qty where
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prettyM pi = hl Qty <$>
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case pi of
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Zero => ifUnicode "𝟬" "0"
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One => ifUnicode "𝟭" "1"
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Any => ifUnicode "𝛚" "*"
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private
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commas : List (Doc HL) -> List (Doc HL)
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commas [] = []
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commas [x] = [x]
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commas (x::xs) = (x <+> hl Delim ",") :: commas xs
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export %inline
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prettyQtyBinds : Pretty.HasEnv m => List Qty -> m (Doc HL)
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prettyQtyBinds =
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map ((hl Delim "@" <++>) . align . sep . commas) . traverse pretty0M
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public export
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plus : Qty -> Qty -> Qty
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plus Zero rh = rh
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plus pi Zero = pi
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plus _ _ = Any
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public export
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times : Qty -> Qty -> Qty
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times Zero _ = Zero
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times _ Zero = Zero
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times One rh = rh
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times pi One = pi
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times Any Any = Any
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infix 6 <=.
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public export
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compat : Qty -> Qty -> Bool
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compat pi rh = rh == Any || pi == rh
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public export
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interface IsQty q where
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zero, one : q
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(+), (*) : q -> q -> q
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(<=.) : q -> q -> Bool
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public export
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IsQty Qty where
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zero = Zero; one = One
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(+) = plus; (*) = times
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(<=.) = compat
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public export
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data IsSubj : Qty -> Type where
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SZero : IsSubj Zero
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SOne : IsSubj One
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export Uninhabited (IsSubj Any) where uninhabited _ impossible
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public export
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data IsGlobal : Qty -> Type where
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GZero : IsGlobal Zero
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GAny : IsGlobal Any
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export Uninhabited (IsGlobal One) where uninhabited _ impossible
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