add Quox.Thin
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@ -1,9 +1,11 @@
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module Quox.NatExtra
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import public Data.Nat
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import public Data.Nat.Views
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import Data.Nat.Division
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import Data.SnocList
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import Data.Vect
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import Syntax.PreorderReasoning
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%default total
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@ -55,3 +57,30 @@ parameters {base : Nat} {auto 0 _ : base `GTE` 2} (chars : Vect base Char)
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export
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showHex : Nat -> String
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showHex = showAtBase $ fromList $ unpack "0123456789ABCDEF"
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export
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0 notEvenOdd : (a, b : Nat) -> Not (a + a = S (b + b))
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notEvenOdd 0 b prf = absurd prf
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notEvenOdd (S a) b prf =
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notEvenOdd b a $ Calc $
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|~ b + b
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~~ a + S a ..<(inj S prf)
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~~ S (a + a) ..<(plusSuccRightSucc {})
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export
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0 doubleInj : (m, n : Nat) -> m + m = n + n -> m = n
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doubleInj 0 0 _ = Refl
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doubleInj (S m) (S n) prf =
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cong S $ doubleInj m n $
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inj S $ Calc $
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|~ S (m + m)
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~~ m + S m ...(plusSuccRightSucc {})
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~~ n + S n ...(inj S prf)
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~~ S (n + n) ..<(plusSuccRightSucc {})
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export
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0 halfDouble : (n : Nat) -> half (n + n) = HalfEven n
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halfDouble n with (half (n + n)) | (n + n) proof nn
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_ | HalfOdd k | S (k + k) = void $ notEvenOdd n k nn
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_ | HalfEven k | k + k = rewrite doubleInj n k nn in Refl
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388
lib/Quox/Thin.idr
Normal file
388
lib/Quox/Thin.idr
Normal file
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@ -0,0 +1,388 @@
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||| thinnings, covers, partitions, etc,
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||| for co-de Bruijn representation [@egtbs]
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module Quox.Thin
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import Quox.NatExtra
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import Data.Nat.Views
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import Data.Singleton
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import Data.DPair
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import Syntax.PreorderReasoning
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%default total
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||| "order preserving embeddings", for recording a correspondence between a
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||| smaller scope and part of a larger one. the third argument is a bitmask
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||| representing this OPE, unique for a given `n`.
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public export
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data OPE : (m, n, mask : Nat) -> Type where
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[search m n]
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Stop : OPE 0 0 0
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Drop : OPE m n mask -> mask' = mask + mask -> OPE m (S n) mask'
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Keep : OPE m n mask -> mask' = (S (mask + mask)) -> OPE (S m) (S n) mask'
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%name OPE ope
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||| everything selected
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public export
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id : {m : Nat} -> Subset Nat (OPE m m)
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id {m = 0} = Element _ Stop
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id {m = S m} = Element _ $ Keep id.snd Refl
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||| nothing selected
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public export
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zero : {m : Nat} -> OPE 0 m 0
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zero {m = 0} = Stop
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zero {m = S m} = Drop zero Refl
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infix 6 `Eqv`
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public export
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data Eqv : OPE m1 n1 mask1 -> OPE m2 n2 mask2 -> Type where
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EqvStop : Eqv Stop Stop
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EqvDrop : {0 p : OPE m1 n1 mask1} ->
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{0 q : OPE m2 n2 mask2} ->
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Eqv p q -> Eqv (Drop p eq1) (Drop q eq2)
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EqvKeep : {0 p : OPE m1 n1 mask1} ->
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{0 q : OPE m2 n2 mask2} ->
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Eqv p q -> Eqv (Keep p eq1) (Keep q eq2)
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%name Eqv eqv
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export
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Reflexive (OPE m n mask) Eqv where
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reflexive {x = Stop} = EqvStop
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reflexive {x = Drop {}} = EqvDrop reflexive
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reflexive {x = Keep {}} = EqvKeep reflexive
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export
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symmetric : p `Eqv` q -> q `Eqv` p
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symmetric EqvStop = EqvStop
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symmetric (EqvDrop eqv) = EqvDrop $ symmetric eqv
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symmetric (EqvKeep eqv) = EqvKeep $ symmetric eqv
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export
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transitive : p `Eqv` q -> q `Eqv` r -> p `Eqv` r
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transitive EqvStop EqvStop = EqvStop
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transitive (EqvDrop x) (EqvDrop y) = EqvDrop (transitive x y)
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transitive (EqvKeep x) (EqvKeep y) = EqvKeep (transitive x y)
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export
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eqvIndices : {0 p : OPE m1 n1 mask1} -> {0 q : OPE m2 n2 mask2} ->
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p `Eqv` q -> (m1 = m2, n1 = n2, mask1 = mask2)
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eqvIndices EqvStop = (Refl, Refl, Refl)
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eqvIndices (EqvDrop eqv {eq1 = Refl, eq2 = Refl}) =
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let (Refl, Refl, Refl) = eqvIndices eqv in (Refl, Refl, Refl)
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eqvIndices (EqvKeep eqv {eq1 = Refl, eq2 = Refl}) =
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let (Refl, Refl, Refl) = eqvIndices eqv in (Refl, Refl, Refl)
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export
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0 eqvMask : (p : OPE m1 n mask1) -> (q : OPE m2 n mask2) ->
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mask1 = mask2 -> p `Eqv` q
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eqvMask Stop Stop _ = EqvStop
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eqvMask (Drop ope1 Refl) (Drop {mask = mm2} ope2 eq2) Refl =
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EqvDrop $ eqvMask ope1 ope2 (doubleInj _ _ eq2)
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eqvMask (Drop ope1 Refl) (Keep ope2 eq2) Refl =
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void $ notEvenOdd _ _ eq2
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eqvMask (Keep ope1 eq1) (Keep ope2 eq2) Refl =
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EqvKeep $ eqvMask ope1 ope2 (doubleInj _ _ $ inj S $ trans (sym eq1) eq2)
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eqvMask (Keep ope1 eq1) (Drop ope2 eq2) Refl =
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void $ notEvenOdd _ _ $ trans (sym eq2) eq1
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uip : (p, q : a = b) -> p = q
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uip Refl Refl = Refl
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export
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0 eqvEq' : (p, q : OPE m n mask) -> p `Eqv` q -> p === q
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eqvEq' Stop Stop EqvStop = Refl
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eqvEq' (Drop p eq1) (Drop q eq2) (EqvDrop eqv)
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with (doubleInj _ _ $ trans (sym eq1) eq2)
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_ | Refl = cong2 Drop (eqvEq' p q eqv) (uip eq1 eq2)
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eqvEq' (Keep p eq1) (Keep q eq2) (EqvKeep eqv)
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with (doubleInj _ _ $ inj S $ trans (sym eq1) eq2)
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_ | Refl = cong2 Keep (eqvEq' p q eqv) (uip eq1 eq2)
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export
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0 eqvEq : (p : OPE m1 n1 mask1) -> (q : OPE m2 n2 mask2) ->
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p `Eqv` q -> p ~=~ q
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eqvEq p q eqv = let (Refl, Refl, Refl) = eqvIndices eqv in eqvEq' p q eqv
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public export
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data View : OPE m n mask -> Type where
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StopV : View Stop
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DropV : (mask : Nat) -> (0 ope : OPE m n mask) -> View (Drop ope Refl)
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KeepV : (mask : Nat) -> (0 ope : OPE m n mask) -> View (Keep ope Refl)
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%name Thin.View v
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private
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0 stopEqs : OPE m 0 mask -> (m = 0, mask = 0)
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stopEqs Stop = (Refl, Refl)
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private
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0 fromStop : (ope : OPE 0 0 0) -> ope = Stop
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fromStop Stop = Refl
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private
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0 fromDrop : (ope : OPE m (S n) (k + k)) ->
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(inner : OPE m n k ** ope === Drop inner Refl)
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fromDrop (Drop ope eq) with (doubleInj _ _ eq)
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fromDrop (Drop ope Refl) | Refl = (ope ** Refl)
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fromDrop (Keep ope eq) = void $ notEvenOdd _ _ eq
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private
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0 fromKeep : (ope : OPE (S m) (S n) (S (k + k))) ->
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(inner : OPE m n k ** ope === Keep inner Refl)
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fromKeep (Drop ope eq) = void $ notEvenOdd _ _ $ sym eq
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fromKeep (Keep ope eq) with (doubleInj _ _ $ inj S eq)
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fromKeep (Keep ope Refl) | Refl = (ope ** Refl)
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private
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0 keepIsSucc : (ope : OPE m n (S (k + k))) -> IsSucc m
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keepIsSucc (Drop ope eq) = void $ notEvenOdd _ _ $ sym eq
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keepIsSucc (Keep ope _) = ItIsSucc
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export
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view : {0 m : Nat} -> {n, mask : Nat} -> (0 ope : OPE m n mask) -> View ope
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view {n = 0} ope with 0 (fst $ stopEqs ope) | 0 (snd $ stopEqs ope)
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_ | Refl | Refl = rewrite fromStop ope in StopV
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view {n = S n} ope with (half mask)
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_ | HalfOdd mask' with 0 (keepIsSucc ope)
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_ | ItIsSucc with 0 (fromKeep ope)
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_ | (ope' ** eq) = rewrite eq in KeepV mask' ope'
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_ | HalfEven mask' with 0 (fromDrop ope)
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_ | (ope' ** eq) = rewrite eq in DropV mask' ope'
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export
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appOpe : {0 m : Nat} -> (n : Nat) -> {mask : Nat} ->
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(0 ope : OPE m n mask) -> Singleton m
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appOpe n ope with (view ope)
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appOpe 0 Stop | StopV = Val 0
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appOpe (S n) (Drop ope' _) | DropV _ ope' = appOpe n ope'
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appOpe (S n) (Keep ope' _) | KeepV _ ope' = [|S $ appOpe n ope'|]
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||| inductive definition of OPE composition
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public export
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data Comp : (l : OPE n p mask1) -> (r : OPE m n mask2) ->
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(res : OPE m p mask3) -> Type where
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[search l r]
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StopZ : Comp Stop Stop Stop
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DropZ : Comp a b c -> Comp (Drop a Refl) b (Drop c Refl)
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KeepZ : Comp a b c -> Comp (Keep a Refl) (Keep b Refl) (Keep c Refl)
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KDZ : Comp a b c -> Comp (Keep a Refl) (Drop b Refl) (Drop c Refl)
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public export
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record CompResult (ope1 : OPE n p mask1) (ope2 : OPE m n mask2) where
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constructor MkComp
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{resultMask : Nat}
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{0 result : OPE m p resultMask}
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0 comp : Comp ope1 ope2 result
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%name CompResult comp
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||| compose two OPEs, if the middle scope size is already known at runtime
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export
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comp' : {n, p, mask1, mask2 : Nat} ->
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(0 ope1 : OPE n p mask1) -> (0 ope2 : OPE m n mask2) ->
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CompResult ope1 ope2
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comp' ope1 ope2 with (view ope1) | (view ope2)
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comp' Stop Stop | StopV | StopV =
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MkComp StopZ
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comp' (Drop ope1 Refl) ope2 | DropV _ ope1 | _ =
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MkComp $ DropZ (comp' ope1 ope2).comp
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comp' (Keep ope1 Refl) (Drop ope2 Refl) | KeepV _ ope1 | DropV _ ope2 =
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MkComp $ KDZ (comp' ope1 ope2).comp
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comp' (Keep ope1 Refl) (Keep ope2 Refl) | KeepV _ ope1 | KeepV _ ope2 =
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MkComp $ KeepZ (comp' ope1 ope2).comp
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||| compose two OPEs, after recomputing the middle scope size using `appOpe`
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export
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comp : {p, mask1, mask2 : Nat} ->
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(0 ope1 : OPE n p mask1) -> (0 ope2 : OPE m n mask2) ->
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CompResult ope1 ope2
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comp ope1 ope2 = let Val n = appOpe p ope1 in comp' ope1 ope2
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-- [todo] is there a quick way to compute the mask of comp?
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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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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 (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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||| the tail of a non-empty OPE is its behaviour on all but the innermost slot
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public export
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data Tail : (full : OPE m1 (S n) mask1) -> (tail : OPE m2 n mask2) -> Type where
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[search full]
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DropT : Tail (Drop ope eq) ope
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KeepT : Tail (Keep ope eq) ope
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%name Tail tail
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public export
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record TailRes (0 ope : OPE m (S n) mask) where
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constructor MkTail
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{0 scope : Nat}
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{tailMask : Nat}
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0 tail : OPE scope n tailMask
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0 isTail : Tail ope tail
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export
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tail : {n, mask : Nat} -> (0 ope : OPE m (S n) mask) -> TailRes ope
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tail ope with (view ope)
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tail (Drop ope _) | DropV _ ope = MkTail ope DropT
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tail (Keep ope _) | KeepV _ ope = MkTail ope KeepT
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namespace OPEList
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||| a list of OPEs of a given outer scope size
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public export
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data OPEList : Nat -> Type where
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Nil : OPEList n
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(::) : OPE m n mask -> OPEList n -> OPEList n
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%name OPEList opes
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namespace Tails -- 🦊
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||| `Tails opes tails` if each i'th element of `tails` is the tail of
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||| the i'th element of `opes`
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public export
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data Tails : (full : OPEList (S n)) -> (tails : OPEList n) -> Type where
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[search full]
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Nil : Tails [] []
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(::) : Tail ope tail -> Tails opes tails ->
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Tails (ope :: opes) (tail :: tails)
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namespace Cover
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||| an OPE list is a cover if at least one of the OPEs has `Keep` as the head,
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||| and the tails are also a cover
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|||
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||| in @egtbs it is a binary relation which is fine for ×ᵣ but i don't want to
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||| write my AST in universe-of-syntaxes style. sorry
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public export data Cover : OPEList n -> Type
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||| the "`Keep` in the head" condition of a cover
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public export data Cover1 : OPEList n -> Type
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data Cover where
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Nil : Cover opes {n = 0}
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(::) : Cover1 opes -> Tails opes tails => Cover tails -> Cover opes
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%name Cover cov
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data Cover1 where
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Here : Cover1 (Keep p eq :: opes)
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There : Cover1 opes -> Cover1 (ope :: opes)
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%name Cover1 cov1
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public export
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record Coprod (ope1 : OPE m1 n mask1) (ope2 : OPE m2 n mask2) where
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constructor MkCoprod
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{0 size : Nat}
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{sizeMask : Nat}
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{leftMask : Nat}
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{rightMask : Nat}
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{0 sub : OPE size n sizeMask}
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{0 left : OPE m1 size leftMask}
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{0 right : OPE m2 size rightMask}
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0 leftComp : Comp sub left ope1
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0 rightComp : Comp sub right ope2
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{auto 0 isCover : Cover [left, right]}
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%name Coprod cop
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export
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coprod : {n, mask1, mask2 : Nat} ->
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(0 ope1 : OPE m1 n mask1) -> (0 ope2 : OPE m2 n mask2) ->
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Coprod ope1 ope2
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coprod ope1 ope2 with (view ope1) | (view ope2)
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coprod Stop Stop | StopV | StopV = MkCoprod StopZ StopZ
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coprod (Drop ope1 Refl) (Drop ope2 Refl) | DropV _ ope1 | DropV _ ope2 =
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let MkCoprod l r = coprod ope1 ope2 in MkCoprod (DropZ l) (DropZ r)
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coprod (Drop ope1 Refl) (Keep ope2 Refl) | DropV _ ope1 | KeepV _ ope2 =
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let MkCoprod l r = coprod ope1 ope2 in MkCoprod (KDZ l) (KeepZ r)
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coprod (Keep ope1 Refl) (Drop ope2 Refl) | KeepV _ ope1 | DropV _ ope2 =
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let MkCoprod l r = coprod ope1 ope2 in MkCoprod (KeepZ l) (KDZ r)
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coprod (Keep ope1 Refl) (Keep ope2 Refl) | KeepV _ ope1 | KeepV _ ope2 =
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let MkCoprod l r = coprod ope1 ope2 in MkCoprod (KeepZ l) (KeepZ r)
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-- [todo] n-ary coprod
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public export
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record Chunks m n where
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constructor MkChunks
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{leftMask : Nat}
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{rightMask : Nat}
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0 left : OPE m (m + n) leftMask
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0 right : OPE n (m + n) rightMask
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{auto 0 isCover : Cover [left, right]}
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%name Chunks chunks
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export
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chunks : (m, n : Nat) -> Chunks m n
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chunks 0 0 = MkChunks Stop Stop
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chunks 0 (S n) =
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let MkChunks l r = chunks 0 n in
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MkChunks (Drop l Refl) (Keep r Refl)
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chunks (S m) n =
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let MkChunks l r = chunks m n in
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MkChunks (Keep l Refl) (Drop r Refl)
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-- [todo] the masks here are just ((2 << m) - 1) << n and (2 << n) - 1
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public export
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record SplitAt m n1 n2 (ope : OPE m (n1 + n2) mask) where
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constructor MkSplitAt
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{leftMask, rightMask : Nat}
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||||
{0 leftScope, rightScope : Nat}
|
||||
0 left : OPE leftScope n1 leftMask
|
||||
0 right : OPE rightScope n2 rightMask
|
||||
0 scopePrf : m = leftScope + rightScope
|
||||
0 opePrf : ope `Eqv` (left `app'` right).snd
|
||||
%name SplitAt split
|
||||
|
||||
export
|
||||
splitAt : (n1 : Nat) -> {n2, mask : Nat} -> (0 ope : OPE m (n1 + n2) mask) ->
|
||||
SplitAt m n1 n2 ope
|
||||
splitAt 0 ope = MkSplitAt zero ope Refl reflexive
|
||||
splitAt (S n1) ope with (view ope)
|
||||
splitAt (S n1) (Drop ope Refl) | DropV _ ope with (splitAt n1 ope)
|
||||
_ | MkSplitAt left right scopePrf opePrf =
|
||||
MkSplitAt (Drop left Refl) right scopePrf (EqvDrop opePrf)
|
||||
splitAt (S n1) (Keep ope Refl) | KeepV _ ope with (splitAt n1 ope)
|
||||
_ | MkSplitAt left right scopePrf opePrf =
|
||||
MkSplitAt (Keep left Refl) right (cong S scopePrf) (EqvKeep opePrf)
|
||||
|
||||
|
||||
public export
|
||||
record Thinned f n where
|
||||
constructor Th
|
||||
{0 scope : Nat}
|
||||
{scopeMask : Nat}
|
||||
0 ope : OPE scope n scopeMask
|
||||
term : f scope
|
||||
%name Thinned s, t, u
|
||||
|
||||
export
|
||||
pure : {n : Nat} -> f n -> Thinned f n
|
||||
pure term = Th id.snd term
|
||||
|
||||
export
|
||||
join : {n : Nat} -> Thinned (Thinned f) n -> Thinned f n
|
||||
join (Th ope1 (Th ope2 term)) = Th (comp ope1 ope2).result term
|
||||
|
|
@ -17,6 +17,7 @@ modules =
|
|||
Quox.No,
|
||||
Quox.Loc,
|
||||
Quox.OPE,
|
||||
Quox.Thin,
|
||||
Quox.Pretty,
|
||||
Quox.Syntax,
|
||||
Quox.Syntax.Dim,
|
||||
|
|
|
|||
Loading…
Reference in a new issue