re-add tightening and use it when messing with scopes
e.g. "coe [_ ⇒ A] @p @q s" should immediately reduce to "s", but if the "_ ⇒ A" happened to use an SY it didn't. this will still happen if a wrong SY sneaks in but the alternative is re-traversing the term over and over every time whnf runs
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16 changed files with 534 additions and 304 deletions
57
lib/Quox/NatExtra.idr
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57
lib/Quox/NatExtra.idr
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module Quox.NatExtra
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import public Data.Nat
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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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%default total
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public export
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data LTE' : Nat -> Nat -> Type where
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LTERefl : LTE' n n
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LTESuccR : LTE' m n -> LTE' m (S n)
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%builtin Natural LTE'
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public export %hint
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lteZero' : {n : Nat} -> LTE' 0 n
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lteZero' {n = 0} = LTERefl
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lteZero' {n = S n} = LTESuccR lteZero'
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public export %hint
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lteSucc' : LTE' m n -> LTE' (S m) (S n)
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lteSucc' LTERefl = LTERefl
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lteSucc' (LTESuccR p) = LTESuccR $ lteSucc' p
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public export
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fromLte : {n : Nat} -> LTE m n -> LTE' m n
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fromLte LTEZero = lteZero'
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fromLte (LTESucc p) = lteSucc' $ fromLte p
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public export
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toLte : {n : Nat} -> m `LTE'` n -> m `LTE` n
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toLte LTERefl = reflexive
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toLte (LTESuccR p) = lteSuccRight (toLte p)
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private
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0 baseNZ : n `GTE` 2 => NonZero n
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baseNZ @{LTESucc _} = SIsNonZero
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parameters {base : Nat} {auto 0 _ : base `GTE` 2} (chars : Vect base Char)
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private
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showAtBase' : List Char -> Nat -> List Char
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showAtBase' acc 0 = acc
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showAtBase' acc k =
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let dig = natToFinLT (modNatNZ k base baseNZ) @{boundModNatNZ {}} in
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showAtBase' (index dig chars :: acc)
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(assert_smaller k $ divNatNZ k base baseNZ)
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export
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showAtBase : Nat -> String
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showAtBase = pack . showAtBase' []
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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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76
lib/Quox/OPE.idr
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76
lib/Quox/OPE.idr
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@ -0,0 +1,76 @@
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||| "order preserving embeddings", for recording a correspondence between
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||| a smaller scope and part of a larger one.
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module Quox.OPE
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import Quox.NatExtra
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import Data.Nat
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%default total
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public export
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data OPE : Nat -> Nat -> Type where
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Id : OPE n n
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Drop : OPE m n -> OPE m (S n)
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Keep : OPE m n -> OPE (S m) (S n)
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%name OPE p, q
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public export %inline Injective Drop where injective Refl = Refl
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public export %inline Injective Keep where injective Refl = Refl
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public export
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opeZero : {n : Nat} -> OPE 0 n
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opeZero {n = 0} = Id
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opeZero {n = S n} = Drop opeZero
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public export
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(.) : OPE m n -> OPE n p -> OPE m p
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p . Id = p
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Id . q = q
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p . Drop q = Drop $ p . q
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Drop p . Keep q = Drop $ p . q
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Keep p . Keep q = Keep $ p . q
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public export
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toLTE : {m : Nat} -> OPE m n -> m `LTE` n
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toLTE Id = reflexive
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toLTE (Drop p) = lteSuccRight $ toLTE p
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toLTE (Keep p) = LTESucc $ toLTE p
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public export
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keepN : (n : Nat) -> OPE a b -> OPE (n + a) (n + b)
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keepN 0 p = p
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keepN (S n) p = Keep $ keepN n p
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public export
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dropInner' : LTE' m n -> OPE m n
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dropInner' LTERefl = Id
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dropInner' (LTESuccR p) = Drop $ dropInner' $ force p
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public export
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dropInner : {n : Nat} -> LTE m n -> OPE m n
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dropInner = dropInner' . fromLte
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public export
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dropInnerN : (m : Nat) -> OPE n (m + n)
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dropInnerN 0 = Id
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dropInnerN (S m) = Drop $ dropInnerN m
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public export
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interface Tighten t where
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tighten : OPE m n -> t n -> Maybe (t m)
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parameters {auto _ : Tighten t}
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export %inline
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tightenInner : {n : Nat} -> m `LTE` n -> t n -> Maybe (t m)
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tightenInner = tighten . dropInner
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export %inline
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tightenN : (m : Nat) -> t (m + n) -> Maybe (t n)
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tightenN m = tighten $ dropInnerN m
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export %inline
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tighten1 : t (S n) -> Maybe (t n)
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tighten1 = tightenN 1
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@ -164,9 +164,8 @@ mutual
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<*> fromPDimWith ds q
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<*> fromPTermWith ds ns val
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-- [todo] direct translation for homo comp?
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Comp (i, ty) p q val r (j0, val0) (j1, val1) =>
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map E $ CompH
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map E $ CompH'
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<$> fromPTermDScope ds ns [< i] ty
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<*> fromPDimWith ds p
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<*> fromPDimWith ds q
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@ -201,7 +200,7 @@ mutual
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if all isNothing xs then
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SN <$> fromPTermWith ds ns t
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else
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SY (fromSnocVect $ map (maybe Unused UN) xs)
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ST (fromSnocVect $ map (maybe Unused UN) xs)
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<$> fromPTermWith ds (ns ++ xs) t
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private
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@ -213,7 +212,7 @@ mutual
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if all isNothing xs then
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SN <$> fromPTermWith ds ns t
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else
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SY (fromSnocVect $ map (maybe Unused UN) xs)
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DST (fromSnocVect $ map (maybe Unused UN) xs)
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<$> fromPTermWith (ds ++ xs) ns t
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@ -251,8 +251,8 @@ mutual
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tycasePi (Pi {arg, res, _}) = pure (arg, res)
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tycasePi (E e) {tnf} = do
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ty <- computeElimType defs ctx e @{noOr2 tnf}
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let arg = E $ typeCase1 e ty KPi [< "Arg", "Ret"] (BVT 1)
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res' = typeCase1 e (Arr Zero arg ty) KPi [< "Arg", "Ret"] (BVT 0)
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let arg = E $ typeCase1Y e ty KPi [< "Arg", "Ret"] (BVT 1)
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res' = typeCase1Y e (Arr Zero arg ty) KPi [< "Arg", "Ret"] (BVT 0)
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res = SY [< "Arg"] $ E $ weakE 1 res' :@ BVT 0
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pure (arg, res)
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tycasePi t = Left $ ExpectedPi ctx.names t
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@ -266,8 +266,8 @@ mutual
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tycaseSig (Sig {fst, snd, _}) = pure (fst, snd)
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tycaseSig (E e) {tnf} = do
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ty <- computeElimType defs ctx e @{noOr2 tnf}
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let fst = E $ typeCase1 e ty KSig [< "Fst", "Snd"] (BVT 1)
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snd' = typeCase1 e (Arr Zero fst ty) KSig [< "Fst", "Snd"] (BVT 0)
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let fst = E $ typeCase1Y e ty KSig [< "Fst", "Snd"] (BVT 1)
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snd' = typeCase1Y e (Arr Zero fst ty) KSig [< "Fst", "Snd"] (BVT 0)
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snd = SY [< "Fst"] $ E $ weakE 1 snd' :@ BVT 0
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pure (fst, snd)
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tycaseSig t = Left $ ExpectedSig ctx.names t
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@ -281,7 +281,7 @@ mutual
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tycaseBOX (BOX _ a) = pure a
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tycaseBOX (E e) {tnf} = do
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ty <- computeElimType defs ctx e @{noOr2 tnf}
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pure $ E $ typeCase1 e ty KBOX [< "Ty"] (BVT 0)
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pure $ E $ typeCase1Y e ty KBOX [< "Ty"] (BVT 0)
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tycaseBOX t = Left $ ExpectedBOX ctx.names t
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||| for Eq [i ⇒ A] l r, returns (A‹0/i›, A‹1/i›, A, l, r);
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@ -295,12 +295,12 @@ mutual
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tycaseEq (E e) {tnf} = do
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ty <- computeElimType defs ctx e @{noOr2 tnf}
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let names = [< "A0", "A1", "A", "L", "R"]
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a0 = E $ typeCase1 e ty KEq names (BVT 4)
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a1 = E $ typeCase1 e ty KEq names (BVT 3)
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a' = typeCase1 e (Eq0 ty a0 a1) KEq names (BVT 2)
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a0 = E $ typeCase1Y e ty KEq names (BVT 4)
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a1 = E $ typeCase1Y e ty KEq names (BVT 3)
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a' = typeCase1Y e (Eq0 ty a0 a1) KEq names (BVT 2)
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a = SY [< "i"] $ E $ dweakE 1 a' :% BV 0
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l = E $ typeCase1 e a0 KEq names (BVT 1)
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r = E $ typeCase1 e a1 KEq names (BVT 0)
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l = E $ typeCase1Y e a0 KEq names (BVT 1)
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r = E $ typeCase1Y e a1 KEq names (BVT 0)
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pure (a0, a1, a, l, r)
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tycaseEq t = Left $ ExpectedEq ctx.names t
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@ -310,20 +310,20 @@ mutual
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private covering
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piCoe : (ty : DScopeTerm d n) -> (p, q : Dim d) -> (val, s : Term d n) ->
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Either Error (Subset (Elim d n) (No . isRedexE defs))
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piCoe sty@(S i ty) p q val s = do
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piCoe sty@(S [< i] ty) p q val s = do
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-- (coe [i ⇒ π.(x : A) → B] @p @q t) s ⇝
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-- coe [i ⇒ B[𝒔‹i›/x] @p @q ((t ∷ (π.(x : A) → B)‹p/i›) 𝒔‹p›)
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-- where 𝒔‹j› ≔ coe [i ⇒ A] @q @j s
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--
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-- type-case is used to expose A,B if the type is neutral
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let ctx1 = extendDimN i ctx
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let ctx1 = extendDim i ctx
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Element ty tynf <- whnf defs ctx1 ty.term
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(arg, res) <- tycasePi defs ctx1 ty
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let s0 = Coe (SY i arg) q p s
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let s0 = CoeT i arg q p s
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body = E $ (val :# (ty // one p)) :@ E s0
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s1 = Coe (SY i (arg // (BV 0 ::: shift 2))) (weakD 1 q) (BV 0)
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(s // shift 1)
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whnf defs ctx $ Coe (SY i $ sub1 res s1) p q body
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s1 = CoeT i (arg // (BV 0 ::: shift 2)) (weakD 1 q) (BV 0)
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(s // shift 1)
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whnf defs ctx $ CoeT i (sub1 res s1) p q body
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||| reduce a pair elimination `CasePair pi (Coe ty p q val) ret body`
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private covering
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@ -331,7 +331,7 @@ mutual
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(ty : DScopeTerm d n) -> (p, q : Dim d) -> (val : Term d n) ->
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(ret : ScopeTerm d n) -> (body : ScopeTermN 2 d n) ->
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Either Error (Subset (Elim d n) (No . isRedexE defs))
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sigCoe qty sty@(S i ty) p q val ret body = do
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sigCoe qty sty@(S [< i] ty) p q val ret body = do
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-- caseπ (coe [i ⇒ (x : A) × B] @p @q s) return z ⇒ C of { (a, b) ⇒ e }
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-- ⇝
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-- caseπ s ∷ ((x : A) × B)‹p/i› return z ⇒ C
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@ -340,33 +340,33 @@ mutual
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-- (coe [i ⇒ B[(coe [j ⇒ A‹j/i›] @p @i a)/x]] @p @q b)/b] }
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--
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-- type-case is used to expose A,B if the type is neutral
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let ctx1 = extendDimN i ctx
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let ctx1 = extendDim i ctx
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Element ty tynf <- whnf defs ctx1 ty.term
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(tfst, tsnd) <- tycaseSig defs ctx1 ty
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let a' = Coe (SY i $ weakT 2 tfst) p q (BVT 1)
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let a' = CoeT i (weakT 2 tfst) p q (BVT 1)
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tsnd' = tsnd.term //
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(Coe (SY i $ weakT 2 $ tfst // (BV 0 ::: shift 2))
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(CoeT i (weakT 2 $ tfst // (BV 0 ::: shift 2))
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(weakD 1 p) (BV 0) (BVT 1) ::: shift 2)
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b' = Coe (SY i tsnd') p q (BVT 0)
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b' = CoeT i tsnd' p q (BVT 0)
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whnf defs ctx $ CasePair qty (val :# (ty // one p)) ret $
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SY body.names $ body.term // (a' ::: b' ::: shift 2)
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ST body.names $ body.term // (a' ::: b' ::: shift 2)
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||| reduce a dimension application `Coe ty p q val :% r`
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private covering
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eqCoe : (ty : DScopeTerm d n) -> (p, q : Dim d) -> (val : Term d n) ->
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(r : Dim d) ->
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Either Error (Subset (Elim d n) (No . isRedexE defs))
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eqCoe sty@(S j ty) p q val r = do
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eqCoe sty@(S [< j] ty) p q val r = do
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-- (coe [j ⇒ Eq [i ⇒ A] L R] @p @q eq) @r
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-- ⇝
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-- comp [j ⇒ A‹r/i›] @p @q (eq ∷ (Eq [i ⇒ A] L R)‹p/j›)
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-- { (r=0) j ⇒ L; (r=1) j ⇒ R }
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let ctx1 = extendDimN j ctx
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let ctx1 = extendDim j ctx
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Element ty tynf <- whnf defs ctx1 ty.term
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(a0, a1, a, s, t) <- tycaseEq defs ctx1 ty
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let a' = SY j $ dsub1 a (weakD 1 r)
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let a' = dsub1 a (weakD 1 r)
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val' = E $ (val :# (ty // one p)) :% r
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whnf defs ctx $ CompH a' p q val' r (SY j s) (SY j t)
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whnf defs ctx $ CompH j a' p q val' r j s j t
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|
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||| reduce a pair elimination `CaseBox pi (Coe ty p q val) ret body`
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private covering
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|
|
@ -374,17 +374,17 @@ mutual
|
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(ty : DScopeTerm d n) -> (p, q : Dim d) -> (val : Term d n) ->
|
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(ret : ScopeTerm d n) -> (body : ScopeTerm d n) ->
|
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Either Error (Subset (Elim d n) (No . isRedexE defs))
|
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boxCoe qty sty@(S i ty) p q val ret body = do
|
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boxCoe qty sty@(S [< i] ty) p q val ret body = do
|
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-- caseπ (coe [i ⇒ [ρ. A]] @p @q s) return z ⇒ C of { [a] ⇒ e }
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-- ⇝
|
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-- caseπ s ∷ [ρ. A]‹p/i› return z ⇒ C
|
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-- of { [a] ⇒ e[(coe [i ⇒ A] p q a)/a] }
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let ctx1 = extendDimN i ctx
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let ctx1 = extendDim i ctx
|
||||
Element ty tynf <- whnf defs ctx1 ty.term
|
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ta <- tycaseBOX defs ctx1 ty
|
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let a' = Coe (SY i $ weakT 1 ta) p q $ BVT 0
|
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let a' = CoeT i (weakT 1 ta) p q $ BVT 0
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whnf defs ctx $ CaseBox qty (val :# (ty // one p)) ret $
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SY body.names $ body.term // (a' ::: shift 1)
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ST body.names $ body.term // (a' ::: shift 1)
|
||||
|
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|
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export covering
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|
|
@ -641,8 +641,8 @@ mutual
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|||
-- just η expand it. then whnf for (:@) will handle it later
|
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-- this is how @xtt does it
|
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Lam body => do
|
||||
let body' = Coe (SY [< i] ty) p q (Lam body)
|
||||
term' = Lam (SY [< "y"] $ E $ weakE 1 body' :@ BVT 0)
|
||||
let body' = CoeT i ty p q $ Lam body
|
||||
term' = [< "y"] :\\ E (weakE 1 body' :@ BVT 0)
|
||||
type' = ty // one q
|
||||
whnf defs ctx $ term' :# type'
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||||
|
||||
|
|
@ -654,10 +654,10 @@ mutual
|
|||
Lam body => do
|
||||
let Pi {qty, arg, res} = ty
|
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| _ => Left $ ?err
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||||
let arg' = SY [< "j"] $ weakT 1 $ arg // (BV 0 ::: shift 2)
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res' = SY [< i] $ res.term //
|
||||
let arg' = ST [< "j"] $ weakT 1 $ arg // (BV 0 ::: shift 2)
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res' = ST [< i] $ res.term //
|
||||
(Coe arg' (weakD 1 q) (BV 0) (BVT 0) ::: shift 1)
|
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body = SY body.names $ E $ Coe res' p q body.term
|
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body = ST body.names $ E $ Coe res' p q body.term
|
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pure $ Element (Lam body :# Pi qty (arg // one q) (res // one q)) Ah
|
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-}
|
||||
|
||||
|
|
@ -670,18 +670,17 @@ mutual
|
|||
Pair fst snd => do
|
||||
let Sig {fst = tfst, snd = tsnd} = ty
|
||||
| _ => Left $ ExpectedSig (extendDim i ctx.names) ty
|
||||
let fst' = E $ Coe (SY [< i] tfst) p q fst
|
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tfst' = SY [< "j"] $ tfst `CanDSubst.(//)` (BV 0 ::: shift 2)
|
||||
tsnd' = SY [< i] $ sub1 tsnd $
|
||||
Coe tfst' (weakD 1 p) (BV 0) $ dweakT 1 fst
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||||
snd' = E $ Coe tsnd' p q snd
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let fst' = E $ CoeT i tfst p q fst
|
||||
tfst' = tfst // (BV 0 ::: shift 2)
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||||
tsnd' = sub1 tsnd $ CoeT "j" tfst' (weakD 1 p) (BV 0) $ dweakT 1 fst
|
||||
snd' = E $ CoeT i tsnd' p q snd
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||||
pure $
|
||||
Element (Pair fst' snd' :# Sig (tfst // one q) (tsnd // one q)) Ah
|
||||
|
||||
-- η expand like λ
|
||||
DLam body => do
|
||||
let body' = Coe (SY [< i] ty) p q (DLam body)
|
||||
term' = DLam (SY [< "j"] $ E $ dweakE 1 body' :% BV 0)
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||||
let body' = CoeT i ty p q $ DLam body
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term' = [< "j"] :\\% E (dweakE 1 body' :% BV 0)
|
||||
type' = ty // one q
|
||||
whnf defs ctx $ term' :# type'
|
||||
|
||||
|
|
@ -700,10 +699,9 @@ mutual
|
|||
Box val => do
|
||||
let BOX {qty, ty = a} = ty
|
||||
| _ => Left $ ExpectedBOX (extendDim i ctx.names) ty
|
||||
let a = SY [< i] a
|
||||
pure $ Element (Box (E $ Coe a p q s) :# BOX qty (dsub1 a q)) Ah
|
||||
pure $ Element (Box (E $ CoeT i a p q s) :# BOX qty (a // one q)) Ah
|
||||
|
||||
E e => pure $ Element (Coe (SY [< i] ty) p q (E e)) (snf `orNo` Ah)
|
||||
E e => pure $ Element (CoeT i ty p q (E e)) (snf `orNo` Ah)
|
||||
where
|
||||
unwrapTYPE : Term (S d) n -> Either Error Universe
|
||||
unwrapTYPE (TYPE u) = pure u
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@ import Data.So
|
|||
|
||||
||| represents the difference between a smaller scope and a larger one.
|
||||
public export
|
||||
data Shift : (0 from, to : Nat) -> Type where
|
||||
data Shift : (from, to : Nat) -> Type where
|
||||
SZ : Shift from from
|
||||
SS : Shift from to -> Shift from (S to)
|
||||
%name Shift by, bz
|
||||
|
|
@ -120,6 +120,25 @@ ssDownViaNat by =
|
|||
%transform "Shift.ssDown" ssDown = ssDownViaNat
|
||||
|
||||
|
||||
public export
|
||||
weak : (s : Nat) -> Shift from to -> Shift (s + from) (s + to)
|
||||
weak s SZ = SZ
|
||||
weak s (SS by) {to = S to} =
|
||||
rewrite sym $ plusSuccRightSucc s to in
|
||||
SS $ weak s by
|
||||
|
||||
private
|
||||
weakViaNat : (s : Nat) -> Shift from to -> Shift (s + from) (s + to)
|
||||
weakViaNat s by =
|
||||
rewrite shiftDiff by in
|
||||
rewrite plusAssociative s by.nat from in
|
||||
rewrite plusCommutative s by.nat in
|
||||
rewrite sym $ plusAssociative by.nat s from in
|
||||
fromNat by.nat
|
||||
|
||||
%transform "Shift.weak" Shift.weak = weakViaNat
|
||||
|
||||
|
||||
public export
|
||||
shift : Shift from to -> Var from -> Var to
|
||||
shift SZ i = i
|
||||
|
|
|
|||
|
|
@ -18,6 +18,12 @@ data Subst : (Nat -> Type) -> Nat -> Nat -> Type where
|
|||
(:::) : (t : Lazy (env to)) -> Subst env from to -> Subst env (S from) to
|
||||
%name Subst th, ph, ps
|
||||
|
||||
infixr 7 !:::
|
||||
||| in case the automatic laziness insertion gets confused
|
||||
public export
|
||||
(!:::) : env to -> Subst env from to -> Subst env (S from) to
|
||||
t !::: ts = t ::: ts
|
||||
|
||||
|
||||
private
|
||||
Repr : (Nat -> Type) -> Nat -> Type
|
||||
|
|
@ -74,6 +80,13 @@ public export %inline
|
|||
id : Subst f n n
|
||||
id = shift 0
|
||||
|
||||
public export
|
||||
traverse : Applicative m =>
|
||||
(f to -> m (g to)) -> Subst f from to -> m (Subst g from to)
|
||||
traverse f (Shift by) = pure $ Shift by
|
||||
traverse f (t ::: th) = [|f t !::: traverse f th|]
|
||||
|
||||
-- not in terms of traverse because this map can maintain laziness better
|
||||
public export
|
||||
map : (f to -> g to) -> Subst f from to -> Subst g from to
|
||||
map f (Shift by) = Shift by
|
||||
|
|
|
|||
|
|
@ -4,3 +4,4 @@ import public Quox.Syntax.Term.Base
|
|||
import public Quox.Syntax.Term.Split
|
||||
import public Quox.Syntax.Term.Subst
|
||||
import public Quox.Syntax.Term.Pretty
|
||||
import public Quox.Syntax.Term.Tighten
|
||||
|
|
|
|||
|
|
@ -228,9 +228,9 @@ s.name = name s
|
|||
|
||||
||| more convenient Pi
|
||||
public export %inline
|
||||
Pi_ : (qty : Qty) -> (x : BaseName) ->
|
||||
PiY : (qty : Qty) -> (x : BaseName) ->
|
||||
(arg : Term d n) -> (res : Term d (S n)) -> Term d n
|
||||
Pi_ {qty, x, arg, res} = Pi {qty, arg, res = S [< x] $ Y res}
|
||||
PiY {qty, x, arg, res} = Pi {qty, arg, res = SY [< x] res}
|
||||
|
||||
||| non dependent function type
|
||||
public export %inline
|
||||
|
|
@ -239,9 +239,9 @@ Arr {qty, arg, res} = Pi {qty, arg, res = SN res}
|
|||
|
||||
||| more convenient Sig
|
||||
public export %inline
|
||||
Sig_ : (x : BaseName) -> (fst : Term d n) ->
|
||||
SigY : (x : BaseName) -> (fst : Term d n) ->
|
||||
(snd : Term d (S n)) -> Term d n
|
||||
Sig_ {x, fst, snd} = Sig {fst, snd = S [< x] $ Y snd}
|
||||
SigY {x, fst, snd} = Sig {fst, snd = SY [< x] snd}
|
||||
|
||||
||| non dependent pair type
|
||||
public export %inline
|
||||
|
|
@ -250,9 +250,9 @@ And {fst, snd} = Sig {fst, snd = SN snd}
|
|||
|
||||
||| more convenient Eq
|
||||
public export %inline
|
||||
Eq_ : (i : BaseName) -> (ty : Term (S d) n) ->
|
||||
EqY : (i : BaseName) -> (ty : Term (S d) n) ->
|
||||
(l, r : Term d n) -> Term d n
|
||||
Eq_ {i, ty, l, r} = Eq {ty = S [< i] $ Y ty, l, r}
|
||||
EqY {i, ty, l, r} = Eq {ty = SY [< i] ty, l, r}
|
||||
|
||||
||| non dependent equality type
|
||||
public export %inline
|
||||
|
|
@ -290,9 +290,9 @@ typeCase : Elim d n -> Term d n ->
|
|||
typeCase ty ret arms def = TypeCase ty ret (fromList arms) def
|
||||
|
||||
public export %inline
|
||||
typeCase1 : Elim d n -> Term d n ->
|
||||
(k : TyConKind) -> NContext (arity k) -> Term d (arity k + n) ->
|
||||
{default Nat def : Term d n} ->
|
||||
Elim d n
|
||||
typeCase1 ty ret k ns body {def} =
|
||||
typeCase1Y : Elim d n -> Term d n ->
|
||||
(k : TyConKind) -> NContext (arity k) -> Term d (arity k + n) ->
|
||||
{default Nat def : Term d n} ->
|
||||
Elim d n
|
||||
typeCase1Y ty ret k ns body {def} =
|
||||
typeCase ty ret [(k ** SY ns body)] def
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@ module Quox.Syntax.Term.Split
|
|||
|
||||
import Quox.Syntax.Term.Base
|
||||
import Quox.Syntax.Term.Subst
|
||||
import Quox.Syntax.Term.Tighten
|
||||
import Quox.Context
|
||||
|
||||
import public Quox.No
|
||||
|
|
@ -133,7 +134,7 @@ infixr 1 :\\
|
|||
public export
|
||||
absN : NContext m -> Term d (m + n) -> Term d n
|
||||
absN [<] s = s
|
||||
absN (xs :< x) s = absN xs $ Lam $ SY [< x] s
|
||||
absN (xs :< x) s = absN xs $ Lam $ ST [< x] s
|
||||
|
||||
public export %inline
|
||||
(:\\) : NContext m -> Term d (m + n) -> Term d n
|
||||
|
|
@ -144,7 +145,7 @@ infixr 1 :\\%
|
|||
public export
|
||||
dabsN : NContext m -> Term (m + d) n -> Term d n
|
||||
dabsN [<] s = s
|
||||
dabsN (xs :< x) s = dabsN xs $ DLam $ SY [< x] s
|
||||
dabsN (xs :< x) s = dabsN xs $ DLam $ DST [< x] s
|
||||
|
||||
public export %inline
|
||||
(:\\%) : NContext m -> Term (m + d) n -> Term d n
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@ module Quox.Syntax.Term.Subst
|
|||
|
||||
import Quox.No
|
||||
import Quox.Syntax.Term.Base
|
||||
import Quox.Syntax.Term.Tighten
|
||||
import Data.SnocVect
|
||||
|
||||
%default total
|
||||
|
|
@ -320,6 +321,29 @@ mutual
|
|||
pushSubstsWith (ps . th) ph e
|
||||
|
||||
|
||||
private %inline
|
||||
CompHY : (ty : DScopeTerm d n) -> (p, q : Dim d) -> (val : Term d n) ->
|
||||
(r : Dim d) -> (zero, one : DScopeTerm d n) -> Elim d n
|
||||
CompHY {ty, p, q, val, r, zero, one} =
|
||||
let ty' = SY ty.names $ ty.term // (B VZ ::: shift 2) in
|
||||
Comp {
|
||||
ty = dsub1 ty q, p, q,
|
||||
val = E $ Coe ty p q val, r,
|
||||
zero = SY zero.names $ E $ Coe ty' (B VZ) (weakD 1 q) zero.term,
|
||||
one = SY one.names $ E $ Coe ty' (B VZ) (weakD 1 q) one.term
|
||||
}
|
||||
|
||||
public export %inline
|
||||
CompH' : (ty : DScopeTerm d n) ->
|
||||
(p, q : Dim d) -> (val : Term d n) -> (r : Dim d) ->
|
||||
(zero : DScopeTerm d n) ->
|
||||
(one : DScopeTerm d n) ->
|
||||
Elim d n
|
||||
CompH' {ty, p, q, val, r, zero, one} =
|
||||
case dsqueeze ty of
|
||||
S _ (N ty) => Comp {ty, p, q, val, r, zero, one}
|
||||
S _ (Y _) => CompHY {ty, p, q, val, r, zero, one}
|
||||
|
||||
||| heterogeneous composition, using Comp and Coe (and subst)
|
||||
|||
|
||||
||| comp [i ⇒ A] @p @q s { (r=0) j ⇒ t₀; (r=1) j ⇒ t₁ }
|
||||
|
|
@ -329,13 +353,11 @@ mutual
|
|||
||| (r=1) j ⇒ coe [i ⇒ A] @j @q t₁
|
||||
||| }
|
||||
public export %inline
|
||||
CompH : (ty : DScopeTerm d n) -> (p, q : Dim d) -> (val : Term d n) ->
|
||||
(r : Dim d) -> (zero, one : DScopeTerm d n) -> Elim d n
|
||||
CompH {ty, p, q, val, r, zero, one} =
|
||||
let ty' = SY ty.names $ ty.term // (B VZ ::: shift 2) in
|
||||
Comp {
|
||||
ty = dsub1 ty q, p, q,
|
||||
val = E $ Coe ty p q val, r,
|
||||
zero = SY zero.names $ E $ Coe ty' (B VZ) (weakD 1 q) zero.term,
|
||||
one = SY one.names $ E $ Coe ty' (B VZ) (weakD 1 q) one.term
|
||||
}
|
||||
CompH : (i : BaseName) -> (ty : Term (S d) n) ->
|
||||
(p, q : Dim d) -> (val : Term d n) -> (r : Dim d) ->
|
||||
(j0 : BaseName) -> (zero : Term (S d) n) ->
|
||||
(j1 : BaseName) -> (one : Term (S d) n) ->
|
||||
Elim d n
|
||||
CompH {i, ty, p, q, val, r, j0, zero, j1, one} =
|
||||
CompH' {ty = SY [< i] ty, p, q, val, r,
|
||||
zero = SY [< j0] zero, one = SY [< j0] one}
|
||||
|
|
|
|||
274
lib/Quox/Syntax/Term/Tighten.idr
Normal file
274
lib/Quox/Syntax/Term/Tighten.idr
Normal file
|
|
@ -0,0 +1,274 @@
|
|||
module Quox.Syntax.Term.Tighten
|
||||
|
||||
import Quox.Syntax.Term.Base
|
||||
import Quox.Syntax.Subst
|
||||
import public Quox.OPE
|
||||
|
||||
%default total
|
||||
|
||||
|
||||
export
|
||||
Tighten (Shift from) where
|
||||
-- `OPE m n` is a spicy `m ≤ n`,
|
||||
-- and `Shift from n` is a (different) spicy `from ≤ n`
|
||||
-- so the value is `from ≤ m` (as a `Shift`), if that is the case
|
||||
tighten _ SZ = Nothing
|
||||
tighten Id by = Just by
|
||||
tighten (Drop p) (SS by) = tighten p by
|
||||
tighten (Keep p) (SS by) = [|SS $ tighten p by|]
|
||||
|
||||
|
||||
export
|
||||
tightenSub : (forall m, n. OPE m n -> env n -> Maybe (env m)) ->
|
||||
OPE to1 to2 -> Subst env from to2 -> Maybe (Subst env from to1)
|
||||
tightenSub f p (Shift by) = [|Shift $ tighten p by|]
|
||||
tightenSub f p (t ::: th) = [|f p t !::: tightenSub f p th|]
|
||||
|
||||
export
|
||||
Tighten env => Tighten (Subst env from) where
|
||||
tighten p th = tightenSub tighten p th
|
||||
|
||||
|
||||
export
|
||||
tightenScope : (forall m, n. OPE m n -> f n -> Maybe (f m)) ->
|
||||
{s : Nat} -> OPE m n -> Scoped s f n -> Maybe (Scoped s f m)
|
||||
tightenScope f p (S names (Y body)) = SY names <$> f (keepN s p) body
|
||||
tightenScope f p (S names (N body)) = S names . N <$> f p body
|
||||
|
||||
export
|
||||
tightenDScope : {0 f : Nat -> Nat -> Type} ->
|
||||
(forall m, n, k. OPE m n -> f n k -> Maybe (f m k)) ->
|
||||
OPE m n -> Scoped s (f n) k -> Maybe (Scoped s (f m) k)
|
||||
tightenDScope f p (S names (Y body)) = SY names <$> f p body
|
||||
tightenDScope f p (S names (N body)) = S names . N <$> f p body
|
||||
|
||||
|
||||
mutual
|
||||
private
|
||||
tightenT : OPE n1 n2 -> Term d n2 -> Maybe (Term d n1)
|
||||
tightenT p (TYPE l) = pure $ TYPE l
|
||||
tightenT p (Pi qty arg res) =
|
||||
Pi qty <$> tightenT p arg <*> tightenS p res
|
||||
tightenT p (Lam body) = Lam <$> tightenS p body
|
||||
tightenT p (Sig fst snd) = Sig <$> tightenT p fst <*> tightenS p snd
|
||||
tightenT p (Pair fst snd) = Pair <$> tightenT p fst <*> tightenT p snd
|
||||
tightenT p (Enum cases) = pure $ Enum cases
|
||||
tightenT p (Tag tag) = pure $ Tag tag
|
||||
tightenT p (Eq ty l r) =
|
||||
Eq <$> tightenDS p ty <*> tightenT p l <*> tightenT p r
|
||||
tightenT p (DLam body) = DLam <$> tightenDS p body
|
||||
tightenT p Nat = pure Nat
|
||||
tightenT p Zero = pure Zero
|
||||
tightenT p (Succ s) = Succ <$> tightenT p s
|
||||
tightenT p (BOX qty ty) = BOX qty <$> tightenT p ty
|
||||
tightenT p (Box val) = Box <$> tightenT p val
|
||||
tightenT p (E e) = assert_total $ E <$> tightenE p e
|
||||
tightenT p (CloT tm th) = do
|
||||
th <- assert_total $ tightenSub tightenE p th
|
||||
pure $ CloT tm th
|
||||
tightenT p (DCloT tm th) = [|DCloT (tightenT p tm) (pure th)|]
|
||||
|
||||
private
|
||||
tightenE : OPE n1 n2 -> Elim d n2 -> Maybe (Elim d n1)
|
||||
tightenE p (F x) = pure $ F x
|
||||
tightenE p (B i) = [|B $ tighten p i|]
|
||||
tightenE p (fun :@ arg) = [|tightenE p fun :@ tightenT p arg|]
|
||||
tightenE p (CasePair qty pair ret body) =
|
||||
CasePair qty <$> tightenE p pair
|
||||
<*> tightenS p ret
|
||||
<*> tightenS p body
|
||||
tightenE p (CaseEnum qty tag ret arms) =
|
||||
CaseEnum qty <$> tightenE p tag
|
||||
<*> tightenS p ret
|
||||
<*> traverse (tightenT p) arms
|
||||
tightenE p (CaseNat qty qtyIH nat ret zero succ) =
|
||||
CaseNat qty qtyIH
|
||||
<$> tightenE p nat
|
||||
<*> tightenS p ret
|
||||
<*> tightenT p zero
|
||||
<*> tightenS p succ
|
||||
tightenE p (CaseBox qty box ret body) =
|
||||
CaseBox qty <$> tightenE p box
|
||||
<*> tightenS p ret
|
||||
<*> tightenS p body
|
||||
tightenE p (fun :% arg) = (:% arg) <$> tightenE p fun
|
||||
tightenE p (tm :# ty) = [|tightenT p tm :# tightenT p ty|]
|
||||
tightenE p (Coe ty q0 q1 val) =
|
||||
Coe <$> tightenDS p ty
|
||||
<*> pure q0 <*> pure q1
|
||||
<*> tightenT p val
|
||||
tightenE p (Comp ty q0 q1 val r zero one) =
|
||||
Comp <$> tightenT p ty
|
||||
<*> pure q0 <*> pure q1
|
||||
<*> tightenT p val
|
||||
<*> pure r
|
||||
<*> tightenDS p zero
|
||||
<*> tightenDS p one
|
||||
tightenE p (TypeCase ty ret arms def) =
|
||||
TypeCase <$> tightenE p ty
|
||||
<*> tightenT p ret
|
||||
<*> traverse (tightenS p) arms
|
||||
<*> tightenT p def
|
||||
tightenE p (CloE el th) = do
|
||||
th <- assert_total $ tightenSub tightenE p th
|
||||
pure $ CloE el th
|
||||
tightenE p (DCloE el th) = [|DCloE (tightenE p el) (pure th)|]
|
||||
|
||||
export
|
||||
tightenS : {s : Nat} -> OPE m n ->
|
||||
ScopeTermN s f n -> Maybe (ScopeTermN s f m)
|
||||
tightenS = assert_total $ tightenScope tightenT
|
||||
|
||||
export
|
||||
tightenDS : OPE m n -> DScopeTermN s f n -> Maybe (DScopeTermN s f m)
|
||||
tightenDS = assert_total $ tightenDScope tightenT {f = \n, d => Term d n}
|
||||
|
||||
export Tighten (Elim d) where tighten p e = tightenE p e
|
||||
export Tighten (Term d) where tighten p t = tightenT p t
|
||||
|
||||
export
|
||||
Tighten Dim where
|
||||
tighten p (K e) = pure $ K e
|
||||
tighten p (B i) = B <$> tighten p i
|
||||
|
||||
|
||||
mutual
|
||||
export
|
||||
dtightenT : OPE d1 d2 -> Term d2 n -> Maybe (Term d1 n)
|
||||
dtightenT p (TYPE l) = pure $ TYPE l
|
||||
dtightenT p (Pi qty arg res) =
|
||||
Pi qty <$> dtightenT p arg <*> dtightenS p res
|
||||
dtightenT p (Lam body) =
|
||||
Lam <$> dtightenS p body
|
||||
dtightenT p (Sig fst snd) =
|
||||
Sig <$> dtightenT p fst <*> dtightenS p snd
|
||||
dtightenT p (Pair fst snd) =
|
||||
Pair <$> dtightenT p fst <*> dtightenT p snd
|
||||
dtightenT p (Enum cases) = pure $ Enum cases
|
||||
dtightenT p (Tag tag) = pure $ Tag tag
|
||||
dtightenT p (Eq ty l r) =
|
||||
Eq <$> dtightenDS p ty <*> dtightenT p l <*> dtightenT p r
|
||||
dtightenT p (DLam body) = DLam <$> dtightenDS p body
|
||||
dtightenT p Nat = pure Nat
|
||||
dtightenT p Zero = pure Zero
|
||||
dtightenT p (Succ s) = Succ <$> dtightenT p s
|
||||
dtightenT p (BOX qty ty) = BOX qty <$> dtightenT p ty
|
||||
dtightenT p (Box val) = Box <$> dtightenT p val
|
||||
dtightenT p (E e) = assert_total $ E <$> dtightenE p e
|
||||
dtightenT p (CloT tm th) = do
|
||||
tm <- dtightenT p tm
|
||||
th <- assert_total $ traverse (dtightenE p) th
|
||||
pure $ CloT tm th
|
||||
dtightenT p (DCloT tm th) = do th <- tighten p th; pure $ DCloT tm th
|
||||
|
||||
export
|
||||
dtightenE : OPE d1 d2 -> Elim d2 n -> Maybe (Elim d1 n)
|
||||
dtightenE p (F x) = pure $ F x
|
||||
dtightenE p (B i) = pure $ B i
|
||||
dtightenE p (fun :@ arg) = [|dtightenE p fun :@ dtightenT p arg|]
|
||||
dtightenE p (CasePair qty pair ret body) =
|
||||
CasePair qty <$> dtightenE p pair
|
||||
<*> dtightenS p ret
|
||||
<*> dtightenS p body
|
||||
dtightenE p (CaseEnum qty tag ret arms) =
|
||||
CaseEnum qty <$> dtightenE p tag
|
||||
<*> dtightenS p ret
|
||||
<*> traverse (dtightenT p) arms
|
||||
dtightenE p (CaseNat qty qtyIH nat ret zero succ) =
|
||||
CaseNat qty qtyIH
|
||||
<$> dtightenE p nat
|
||||
<*> dtightenS p ret
|
||||
<*> dtightenT p zero
|
||||
<*> dtightenS p succ
|
||||
dtightenE p (CaseBox qty box ret body) =
|
||||
CaseBox qty <$> dtightenE p box
|
||||
<*> dtightenS p ret
|
||||
<*> dtightenS p body
|
||||
dtightenE p (fun :% arg) = [|dtightenE p fun :% tighten p arg|]
|
||||
dtightenE p (tm :# ty) = [|dtightenT p tm :# dtightenT p ty|]
|
||||
dtightenE p (Coe ty q0 q1 val) =
|
||||
[|Coe (dtightenDS p ty) (tighten p q0) (tighten p q1) (dtightenT p val)|]
|
||||
dtightenE p (Comp ty q0 q1 val r zero one) =
|
||||
[|Comp (dtightenT p ty) (tighten p q0) (tighten p q1)
|
||||
(dtightenT p val) (tighten p r)
|
||||
(dtightenDS p zero) (dtightenDS p one)|]
|
||||
dtightenE p (TypeCase ty ret arms def) =
|
||||
[|TypeCase (dtightenE p ty) (dtightenT p ret)
|
||||
(traverse (dtightenS p) arms) (dtightenT p def)|]
|
||||
dtightenE p (CloE el th) = do
|
||||
el <- dtightenE p el
|
||||
th <- assert_total $ traverse (dtightenE p) th
|
||||
pure $ CloE el th
|
||||
dtightenE p (DCloE el th) = do
|
||||
th <- tighten p th
|
||||
pure $ DCloE el th
|
||||
|
||||
export
|
||||
dtightenS : OPE d1 d2 -> ScopeTermN s d2 n -> Maybe (ScopeTermN s d1 n)
|
||||
dtightenS = assert_total $ tightenDScope dtightenT {f = Term}
|
||||
|
||||
export
|
||||
dtightenDS : {s : Nat} -> OPE d1 d2 ->
|
||||
DScopeTermN s d2 n -> Maybe (DScopeTermN s d1 n)
|
||||
dtightenDS = assert_total $ tightenScope dtightenT
|
||||
|
||||
|
||||
export [TermD] Tighten (\d => Term d n) where tighten p t = dtightenT p t
|
||||
export [ElimD] Tighten (\d => Elim d n) where tighten p e = dtightenE p e
|
||||
|
||||
|
||||
-- versions of SY, etc, that try to tighten and use SN automatically
|
||||
|
||||
public export
|
||||
ST : Tighten f => {s : Nat} -> NContext s -> f (s + n) -> Scoped s f n
|
||||
ST names body =
|
||||
case tightenN s body of
|
||||
Just body => S names $ N body
|
||||
Nothing => S names $ Y body
|
||||
|
||||
public export
|
||||
DST : {s : Nat} -> NContext s -> Term (s + d) n -> DScopeTermN s d n
|
||||
DST names body =
|
||||
case tightenN @{TermD} s body of
|
||||
Just body => S names $ N body
|
||||
Nothing => S names $ Y body
|
||||
|
||||
public export %inline
|
||||
PiT : (qty : Qty) -> (x : BaseName) ->
|
||||
(arg : Term d n) -> (res : Term d (S n)) -> Term d n
|
||||
PiT {qty, x, arg, res} = Pi {qty, arg, res = ST [< x] res}
|
||||
|
||||
public export %inline
|
||||
SigT : (x : BaseName) -> (fst : Term d n) ->
|
||||
(snd : Term d (S n)) -> Term d n
|
||||
SigT {x, fst, snd} = Sig {fst, snd = ST [< x] snd}
|
||||
|
||||
public export %inline
|
||||
EqT : (i : BaseName) -> (ty : Term (S d) n) ->
|
||||
(l, r : Term d n) -> Term d n
|
||||
EqT {i, ty, l, r} = Eq {ty = DST [< i] ty, l, r}
|
||||
|
||||
public export %inline
|
||||
CoeT : (i : BaseName) -> (ty : Term (S d) n) ->
|
||||
(p, q : Dim d) -> (val : Term d n) -> Elim d n
|
||||
CoeT {i, ty, p, q, val} = Coe {ty = DST [< i] ty, p, q, val}
|
||||
|
||||
public export %inline
|
||||
typeCase1T : Elim d n -> Term d n ->
|
||||
(k : TyConKind) -> NContext (arity k) -> Term d (arity k + n) ->
|
||||
{default Nat def : Term d n} ->
|
||||
Elim d n
|
||||
typeCase1T ty ret k ns body {def} =
|
||||
typeCase ty ret [(k ** ST ns body)] def
|
||||
|
||||
|
||||
export
|
||||
squeeze : {s : Nat} -> ScopeTermN s d n -> ScopeTermN s d n
|
||||
squeeze (S names (Y body)) = S names $ maybe (Y body) N $ tightenN s body
|
||||
squeeze (S names (N body)) = S names $ N body
|
||||
|
||||
export
|
||||
dsqueeze : {s : Nat} -> DScopeTermN s d n -> DScopeTermN s d n
|
||||
dsqueeze (S names (Y body)) =
|
||||
S names $ maybe (Y body) N $ tightenN s body @{TermD}
|
||||
dsqueeze (S names (N body)) = S names $ N body
|
||||
|
|
@ -2,10 +2,11 @@ module Quox.Syntax.Var
|
|||
|
||||
import Quox.Name
|
||||
import Quox.Pretty
|
||||
-- import Quox.OPE
|
||||
import Quox.OPE
|
||||
|
||||
import Data.Nat
|
||||
import Data.List
|
||||
import Data.Vect
|
||||
import public Quox.Decidable
|
||||
import Data.Bool.Decidable
|
||||
import Data.DPair
|
||||
|
|
@ -151,6 +152,16 @@ interface FromVar f where %inline fromVar : Var n -> f n
|
|||
|
||||
public export FromVar Var where fromVar = id
|
||||
|
||||
export
|
||||
tabulateV : {0 tm : Nat -> Type} -> (forall n. Var n -> tm n) ->
|
||||
(n : Nat) -> Vect n (tm n)
|
||||
tabulateV f 0 = []
|
||||
tabulateV f (S n) = f VZ :: tabulateV (f . VS) n
|
||||
|
||||
export
|
||||
allVars : (n : Nat) -> Vect n (Var n)
|
||||
allVars n = tabulateV id n
|
||||
|
||||
|
||||
public export
|
||||
data LT : Rel (Var n) where
|
||||
|
|
@ -287,3 +298,12 @@ decEqFromBool i j =
|
|||
%transform "Var.decEq" varDecEq = decEqFromBool
|
||||
|
||||
public export %inline DecEq (Var n) where decEq = varDecEq
|
||||
|
||||
|
||||
export
|
||||
Tighten Var where
|
||||
tighten Id i = Just i
|
||||
tighten (Drop p) VZ = Nothing
|
||||
tighten (Drop p) (VS i) = tighten p i
|
||||
tighten (Keep p) VZ = Just VZ
|
||||
tighten (Keep p) (VS i) = VS <$> tighten p i
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue