28 lines
919 B
Idris
28 lines
919 B
Idris
module Quox.Thin.Append
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import public Quox.Thin.Base
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import public Quox.Thin.View
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import Data.DPair
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%default total
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public export
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app' : OPE m1 n1 mask1 -> OPE m2 n2 mask2 -> Exists (OPE (m1 + m2) (n1 + n2))
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app' Stop ope2 = Evidence _ ope2
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app' (Drop ope1 Refl) ope2 = Evidence _ $ Drop (app' ope1 ope2).snd Refl
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app' (Keep ope1 Refl) ope2 = Evidence _ $ Keep (app' ope1 ope2).snd Refl
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public export
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(++) : {n1, n2, mask1, mask2 : Nat} ->
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(0 ope1 : OPE m1 n1 mask1) -> (0 ope2 : OPE m2 n2 mask2) ->
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Subset Nat (OPE (m1 + m2) (n1 + n2))
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ope1 ++ ope2 with %syntactic (view ope1)
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Stop ++ ope2 | StopV = Element _ ope2
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Drop ope1 Refl ++ ope2 | DropV mask ope1 =
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Element _ $ Drop (ope1 ++ ope2).snd Refl
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Keep ope1 Refl ++ ope2 | KeepV mask ope1 =
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Element _ $ Keep (ope1 ++ ope2).snd Refl
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-- [todo] this mask is just (mask1 << n2) | mask2
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-- prove it and add %transform
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