162 lines
5.0 KiB
Idris
162 lines
5.0 KiB
Idris
module Quox.Equal
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import public Quox.Syntax
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import Control.Monad.Either
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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 Mode = Equal | Sub
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%runElab derive "Mode" [Generic, Meta, Eq, Ord, DecEq, Show]
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public export
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data Error
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= ClashT Mode (Term d n) (Term d n)
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| ClashU Mode Universe Universe
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| ClashQ Qty Qty
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private %inline
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ClashE : Mode -> Elim d n -> Elim d n -> Error
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ClashE mode = ClashT mode `on` E
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parameters {auto _ : MonadError Error m}
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private %inline
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clashT : Mode -> Term d n -> Term d n -> m a
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clashT mode = throwError .: ClashT mode
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private %inline
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clashE : Mode -> Elim d n -> Elim d n -> m a
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clashE mode = throwError .: ClashE mode
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mutual
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private covering
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compareTN' : Mode ->
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(s, t : Term 0 n) ->
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(0 _ : NotRedexT s) -> (0 _ : NotRedexT t) -> m ()
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compareTN' mode (TYPE k) (TYPE l) _ _ =
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case mode of
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Equal => unless (k == l) $ throwError $ ClashU Equal k l
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Sub => unless (k <= l) $ throwError $ ClashU Sub k l
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compareTN' mode s@(TYPE _) t _ _ = clashT mode s t
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compareTN' mode (Pi qty1 _ arg1 res1) (Pi qty2 _ arg2 res2) _ _ = do
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-- [todo] this should probably always be ==, right..?
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unless (qty1 == qty2) $ throwError $ ClashQ qty1 qty2
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compareT0 mode arg2 arg1 -- reversed for contravariant Sub
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compareTS0 mode res1 res2
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compareTN' mode s@(Pi {}) t _ _ = clashT mode s t
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-- [todo] eta
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compareTN' _ (Lam _ body1) (Lam _ body2) _ _ =
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compareTS0 Equal body1 body2
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compareTN' mode s@(Lam {}) t _ _ = clashT mode s t
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compareTN' mode (E e) (E f) ps pt = compareE0 mode e f
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compareTN' mode s@(E _) t _ _ = clashT mode s t
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compareTN' _ (CloT {}) _ ps _ = void $ ps IsCloT
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compareTN' _ (DCloT {}) _ ps _ = void $ ps IsDCloT
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private covering
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compareEN' : Mode ->
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(e, f : Elim 0 n) ->
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(0 _ : NotRedexE e) -> (0 _ : NotRedexE f) -> m ()
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compareEN' mode e@(F x) f@(F y) _ _ =
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unless (x == y) $ clashE mode e f
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compareEN' mode e@(F _) f _ _ = clashE mode e f
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compareEN' mode e@(B i) f@(B j) _ _ =
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unless (i == j) $ clashE mode e f
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compareEN' mode e@(B _) f _ _ = clashE mode e f
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-- [todo] tracking variance of functions? maybe???
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-- probably not
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compareEN' _ (fun1 :@ arg1) (fun2 :@ arg2) _ _ = do
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compareE0 Equal fun1 fun2
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compareT0 Equal arg1 arg2
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compareEN' mode e@(_ :@ _) f _ _ = clashE mode e f
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-- [todo] is always checking the types are equal correct?
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compareEN' mode (tm1 :# ty1) (tm2 :# ty2) _ _ = do
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compareT0 mode tm1 tm2
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compareT0 Equal ty1 ty2
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compareEN' mode e@(_ :# _) f _ _ = clashE mode e f
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compareEN' _ (CloE {}) _ pe _ = void $ pe IsCloE
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compareEN' _ (DCloE {}) _ pe _ = void $ pe IsDCloE
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private covering %inline
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compareTN : Mode -> NonRedexTerm 0 n -> NonRedexTerm 0 n -> m ()
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compareTN mode s t = compareTN' mode s.fst t.fst s.snd t.snd
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private covering %inline
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compareEN : Mode -> NonRedexElim 0 n -> NonRedexElim 0 n -> m ()
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compareEN mode e f = compareEN' mode e.fst f.fst e.snd f.snd
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export covering %inline
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compareT : Mode -> DimEq d -> Term d n -> Term d n -> m ()
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compareT mode eqs s t =
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for_ (splits eqs) $ \th => compareT0 mode (s /// th) (t /// th)
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export covering %inline
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compareE : Mode -> DimEq d -> Elim d n -> Elim d n -> m ()
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compareE mode eqs e f =
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for_ (splits eqs) $ \th => compareE0 mode (e /// th) (f /// th)
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export covering %inline
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compareT0 : Mode -> Term 0 n -> Term 0 n -> m ()
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compareT0 mode s t = compareTN mode (whnfT s) (whnfT t)
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export covering %inline
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compareE0 : Mode -> Elim 0 n -> Elim 0 n -> m ()
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compareE0 mode e f = compareEN mode (whnfE e) (whnfE f)
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export covering %inline
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compareTS0 : Mode -> ScopeTerm 0 n -> ScopeTerm 0 n -> m ()
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compareTS0 mode (TUnused body1) (TUnused body2) =
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compareT0 mode body1 body2
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compareTS0 mode body1 body2 =
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compareT0 mode (fromScopeTerm body1) (fromScopeTerm body2)
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export covering %inline
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equalTWith : DimEq d -> Term d n -> Term d n -> m ()
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equalTWith = compareT Equal
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export covering %inline
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equalEWith : DimEq d -> Elim d n -> Elim d n -> m ()
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equalEWith = compareE Equal
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export covering %inline
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subTWith : DimEq d -> Term d n -> Term d n -> m ()
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subTWith = compareT Sub
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export covering %inline
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subEWith : DimEq d -> Elim d n -> Elim d n -> m ()
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subEWith = compareE Sub
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export covering %inline
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equalT : {d : Nat} -> Term d n -> Term d n -> m ()
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equalT = equalTWith DimEq.new
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export covering %inline
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equalE : {d : Nat} -> Elim d n -> Elim d n -> m ()
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equalE = equalEWith DimEq.new
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export covering %inline
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subT : {d : Nat} -> Term d n -> Term d n -> m ()
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subT = subTWith DimEq.new
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export covering %inline
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subE : {d : Nat} -> Elim d n -> Elim d n -> m ()
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subE = subEWith DimEq.new
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