erasure to untyped syntax
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3 changed files with 453 additions and 2 deletions
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@ -73,7 +73,7 @@ namespace TContext
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zeroFor : Context tm n -> QOutput n
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zeroFor ctx = Zero <$ ctx
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private
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public export
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extendLen : Telescope a n1 n2 -> Singleton n1 -> Singleton n2
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extendLen [<] x = x
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extendLen (tel :< _) x = [|S $ extendLen tel x|]
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450
lib/Quox/Untyped/Erase.idr
Normal file
450
lib/Quox/Untyped/Erase.idr
Normal file
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@ -0,0 +1,450 @@
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module Quox.Untyped.Erase
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import Quox.Definition
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import Quox.Syntax.Term.Base as Q
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import Quox.Syntax.Term.Subst
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import Quox.Untyped.Syntax as U
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import Quox.Typing.Context
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import Quox.Whnf
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import Quox.EffExtra
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import Data.Singleton
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import Data.SnocVect
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import Language.Reflection
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%default total
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%language ElabReflection
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%hide TT.Name
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public export
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data IsErased = Erased | Kept
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public export
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isErased : Qty -> IsErased
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isErased Zero = Erased
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isErased One = Kept
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isErased Any = Kept
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public export
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ifErased : Qty -> Lazy a -> Lazy a -> a
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ifErased pi x y = case isErased pi of
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Erased => x
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Kept => y
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public export
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EContext : Nat -> Type
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EContext = Context' IsErased
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public export
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record ErasureContext d n where
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constructor MkEContexts
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{auto dimLen : Singleton d}
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{auto termLen : Singleton n}
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dnames : BContext d
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tnames : BContext n
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tctx : TContext d n
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erased : EContext n
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%name ErasureContext ctx
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public export
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TypeError : Type
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TypeError = Typing.Error.Error
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%hide Typing.Error.Error
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public export
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data Error =
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CompileTimeOnly (ErasureContext d n) (Q.Term d n)
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| ErasedVar (ErasureContext d n) (Var n)
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| NotInScope Name
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| WrapTypeError TypeError
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public export
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Erase : List (Type -> Type)
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Erase = [Except Error, DefsReader, NameGen]
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export
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toWhnfContext : ErasureContext d n -> WhnfContext d n
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toWhnfContext (MkEContexts {dnames, tnames, tctx, _}) =
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MkWhnfContext {dnames, tnames, tctx}
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export
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(.names) : ErasureContext d n -> NameContexts d n
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ctx.names = MkNameContexts ctx.dnames ctx.tnames
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export
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liftWhnf : Eff Whnf a -> Eff Erase a
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liftWhnf act = runEff act
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[\x => send x, \case (Err e) => throw $ WrapTypeError e]
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export covering
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whnf0 : {0 isRedex : RedexTest tm} -> CanWhnf tm isRedex =>
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ErasureContext d n -> SQty ->
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tm d n -> Eff Erase (tm d n)
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whnf0 ctx sg tm = do
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let Val n = ctx.termLen; Val d = ctx.dimLen
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liftWhnf $ whnf0 !(askAt DEFS) (toWhnfContext ctx) sg tm
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export covering
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computeElimType : ErasureContext d n -> SQty -> Elim d n -> Eff Erase (Term d n)
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computeElimType ctx sg e = do
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let Val n = ctx.termLen; Val d = ctx.dimLen
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ctx = toWhnfContext ctx
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defs <- askAt DEFS
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Element e enf <- liftWhnf $ whnf defs ctx sg e
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liftWhnf $ computeElimType defs ctx sg e
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parameters (ctx : ErasureContext d n) (loc : Loc)
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private covering %macro
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expect : (forall d, n. Loc -> NameContexts d n -> Term d n -> TypeError) ->
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TTImp -> TTImp -> Elab (Term d n -> Eff Erase a)
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expect k l r = do
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f <- check `(\case ~(l) => Just ~(r); _ => Nothing)
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pure $ \t =>
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let err = throw $ WrapTypeError $ k loc ctx.names t in
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maybe err pure . f =<< whnf0 ctx SZero t
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export covering %inline
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expectTYPE : Term d n -> Eff Erase Universe
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expectTYPE = expect ExpectedTYPE `(TYPE {l, _}) `(l)
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export covering %inline
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expectPi : Term d n -> Eff Erase (Qty, Term d n, ScopeTerm d n)
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expectPi = expect ExpectedPi `(Pi {qty, arg, res, _}) `((qty, arg, res))
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export covering %inline
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expectSig : Term d n -> Eff Erase (Term d n, ScopeTerm d n)
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expectSig = expect ExpectedSig `(Sig {fst, snd, _}) `((fst, snd))
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export covering %inline
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expectEnum : Term d n -> Eff Erase (SortedSet TagVal)
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expectEnum = expect ExpectedEnum `(Enum {cases, _}) `(cases)
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export covering %inline
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expectEq : Term d n -> Eff Erase (DScopeTerm d n, Term d n, Term d n)
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expectEq = expect ExpectedEq `(Eq {ty, l, r, _}) `((ty, l, r))
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export covering %inline
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expectNat : Term d n -> Eff Erase ()
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expectNat = expect ExpectedNat `(Nat {}) `(())
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export covering %inline
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expectBOX : Term d n -> Eff Erase (Qty, Term d n)
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expectBOX = expect ExpectedBOX `(BOX {qty, ty, _}) `((qty, ty))
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export
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extendTyN : CtxExtension d n1 n2 ->
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ErasureContext d n1 -> ErasureContext d n2
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extendTyN tel (MkEContexts {termLen, dnames, tnames, tctx, erased}) =
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let (qs, xs, ss) = unzip3 tel in
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MkEContexts {
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dnames,
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tnames = tnames . xs,
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tctx = tctx . ss,
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erased = erased . map isErased qs,
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termLen = extendLen tel termLen
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}
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export
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extendTy : Qty -> BindName -> Term d n ->
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ErasureContext d n -> ErasureContext d (S n)
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extendTy pi x ty = extendTyN [< (pi, x, ty)]
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export
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extendDim : BindName -> ErasureContext d n -> ErasureContext (S d) n
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extendDim i (MkEContexts {dimLen, dnames, tnames, tctx, erased}) =
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MkEContexts {
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tnames, erased,
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dimLen = [|S dimLen|],
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dnames = dnames :< i,
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tctx = map (dweakT 1) tctx
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}
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public export
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record EraseElimResult d n where
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constructor EraRes
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type : Lazy (Q.Term d n)
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term : U.Term n
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export covering
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eraseTerm : ErasureContext d n ->
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(ty, tm : Q.Term d n) -> Eff Erase (U.Term n)
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export covering
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eraseElim : ErasureContext d n -> (tm : Q.Elim d n) ->
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Eff Erase (EraseElimResult d n)
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eraseTerm ctx _ s@(TYPE {}) =
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throw $ CompileTimeOnly ctx s
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eraseTerm ctx _ s@(Pi {}) =
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throw $ CompileTimeOnly ctx s
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-- π.x : A ⊢ s ⤋ s' ⇐ B
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-- ----------------------------------------
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-- (λ x ⇒ s) ⤋ (λ x ⇒ s') ⇐ π.(x : A) → B
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--
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-- becomes a lambda even when π = 0,
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-- to preserve expected evaluation order
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eraseTerm ctx ty (Lam body loc) = do
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(qty, arg, res) <- expectPi ctx loc ty
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let x = body.name
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body <- eraseTerm (extendTy qty x arg ctx) res.term body.term
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pure $ U.Lam x body loc
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eraseTerm ctx _ s@(Sig {}) =
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throw $ CompileTimeOnly ctx s
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-- s ⤋ s' ⇐ A t ⤋ t' ⇐ B[s/x]
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-- ---------------------------------
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-- (s, t) ⤋ (s', t') ⇐ (x : A) × B
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eraseTerm ctx ty (Pair fst snd loc) = do
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(a, b) <- expectSig ctx loc ty
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let b = sub1 b (Ann fst a a.loc)
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fst <- eraseTerm ctx a fst
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snd <- eraseTerm ctx b snd
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pure $ Pair fst snd loc
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eraseTerm ctx _ s@(Enum {}) =
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throw $ CompileTimeOnly ctx s
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-- '𝐚 ⤋ '𝐚 ⇐ {⋯}
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eraseTerm ctx _ (Tag tag loc) =
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pure $ Tag tag loc
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eraseTerm ctx ty s@(Eq {}) =
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throw $ CompileTimeOnly ctx s
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-- 𝑖 ⊢ s ⤋ s' ⇐ A
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-- ---------------------------------
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-- (δ 𝑖 ⇒ s) ⤋ s' ⇐ Eq (𝑖 ⇒ A) l r
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eraseTerm ctx ty (DLam body loc) = do
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a <- fst <$> expectEq ctx loc ty
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eraseTerm (extendDim body.name ctx) a.term body.term
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eraseTerm ctx _ s@(Nat {}) =
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throw $ CompileTimeOnly ctx s
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-- 0 ⤋ 0 ⇐ ℕ
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eraseTerm _ _ (Zero loc) =
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pure $ Zero loc
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-- s ⤋ s' ⇐ ℕ
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-- -----------------------
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-- succ s ⤋ succ s' ⇐ ℕ
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eraseTerm ctx ty (Succ p loc) = do
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p <- eraseTerm ctx ty p
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pure $ Succ p loc
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eraseTerm ctx ty s@(BOX {}) =
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throw $ CompileTimeOnly ctx s
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-- [s] ⤋ ⌷ ⇐ [0.A]
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--
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-- π ≠ 0 s ⤋ s' ⇐ A
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-- --------------------
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-- [s] ⤋ s' ⇐ [π.A]
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eraseTerm ctx ty (Box val loc) = do
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(qty, a) <- expectBOX ctx loc ty
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case isErased qty of
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Erased => pure $ Erased loc
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Kept => eraseTerm ctx a val
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-- e ⤋ e' ⇒ B
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-- ------------
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-- e ⤋ e' ⇐ A
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eraseTerm ctx ty (E e) =
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term <$> eraseElim ctx e
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eraseTerm ctx ty (CloT (Sub term th)) =
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eraseTerm ctx ty $ pushSubstsWith' id th term
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eraseTerm ctx ty (DCloT (Sub term th)) =
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eraseTerm ctx ty $ pushSubstsWith' th id term
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-- defω x : A = s
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-- ----------------
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-- x ⤋ x ⇒ A
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eraseElim ctx e@(F x u loc) = do
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Just def <- asksAt DEFS $ lookup x
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| Nothing => throw $ NotInScope x
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case isErased def.qty.qty of
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Erased => throw $ CompileTimeOnly ctx $ E e
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Kept =>
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let Val d = ctx.dimLen; Val n = ctx.termLen in
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pure $ EraRes def.type $ F x loc
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-- π ≠ 0
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-- ----------------------------
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-- Γ, π.x : A, Γ' ⊢ x ⤋ x ⇒ A
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eraseElim ctx e@(B i loc) = do
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case ctx.erased !!! i of
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Erased => throw $ CompileTimeOnly ctx $ E e
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Kept => pure $ EraRes (ctx.tctx !! i) $ B i loc
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-- f ⤋ f' ⇒ π.(x : A) → B s ⤋ s' ⇒ A π ≠ 0
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-- ---------------------------------------------
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-- f s ⤋ f' s' ⇒ B[s/x]
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--
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-- f ⤋ f' ⇒ 0.(x : A) → B
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-- -------------------------
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-- f s ⤋ f' ⌷ ⇒ B[s/x]
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eraseElim ctx (App fun arg loc) = do
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efun <- eraseElim ctx fun
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(qty, targ, tres) <- expectPi ctx loc efun.type
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let ty = sub1 tres (Ann arg targ arg.loc)
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case isErased qty of
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Erased => pure $ EraRes ty $ App efun.term (Erased arg.loc) loc
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Kept => do arg <- eraseTerm ctx targ arg
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pure $ EraRes ty $ App efun.term arg loc
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-- e ⤋ e' ⇒ (x : A) × B
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-- ρ.x : A, ρ.y : B ⊢ s ⤋ s' ⇐ R[((x,y) ∷ (x : A) × B)/z]
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-- x̃ ≔ if ρ = 0 then ⌷ else fst e' ỹ ≔ if ρ = 0 then ⌷ else snd e'
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-- -------------------------------------------------------------------
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-- (caseρ e return z ⇒ R of {(x, y) ⇒ s}) ⤋ s'[x̃/x, ỹ/y] ⇒ R[e/z]
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eraseElim ctx (CasePair qty pair ret body loc) = do
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epair <- eraseElim ctx pair
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let ty = sub1 (ret // shift 2) $
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Ann (Pair (BVT 0 loc) (BVT 1 loc) loc) (weakT 2 epair.type) loc
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(tfst, tsnd) <- expectSig ctx loc epair.type
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let [< x, y] = body.names
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let ctx' = extendTyN [< (qty, x, tfst), (qty, y, tsnd.term)] ctx
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body' <- eraseTerm ctx' ty body.term
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let x' = ifErased qty (Erased loc) (Fst epair.term loc)
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y' = ifErased qty (Erased loc) (Snd epair.term loc)
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pure $ EraRes (sub1 ret pair) $ body' // fromSnocVect [< x', y']
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-- e ⤋ e' ⇒ (x : A) × B
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-- ----------------------
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-- fst e ⤋ fst e' ⇒ A
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eraseElim ctx (Fst pair loc) = do
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epair <- eraseElim ctx pair
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a <- fst <$> expectSig ctx loc epair.type
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pure $ EraRes a $ Fst epair.term loc
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-- e ⤋ e' ⇒ (x : A) × B
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-- -----------------------------
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-- snd e ⤋ snd e' ⇒ B[fst e/x]
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eraseElim ctx (Snd pair loc) = do
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epair <- eraseElim ctx pair
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b <- snd <$> expectSig ctx loc epair.type
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pure $ EraRes (sub1 b (Fst pair loc)) $ Snd epair.term loc
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-- case0 e return z ⇒ R of {} ⤋ absurd ⇒ R[e/z]
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--
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-- s ⤋ s' ⇐ R[𝐚∷{𝐚}/z]
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-- -----------------------------------------------
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-- case0 e return z ⇒ R of {𝐚 ⇒ s} ⤋ s' ⇒ R[e/z]
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--
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-- e ⤋ e' ⇒ A ρ ≠ 0 sᵢ ⤋ s'ᵢ ⇐ R[𝐚ᵢ/z]
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-- -------------------------------------------------------------------
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-- caseρ e return z ⇒ R of {𝐚ᵢ ⇒ sᵢ} ⤋ case e of {𝐚ᵢ ⇒ s'ᵢ} ⇒ R[e/z]
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eraseElim ctx e@(CaseEnum qty tag ret arms loc) =
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case isErased qty of
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Erased => case SortedMap.toList arms of
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[] => pure $ EraRes (sub1 ret tag) $ Absurd loc
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[(t, arm)] => do
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let ty = sub1 ret tag
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ty' = sub1 ret (Ann (Tag t loc) (enum [t] loc) loc)
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arm' <- eraseTerm ctx ty' arm
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pure $ EraRes ty arm'
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_ => throw $ CompileTimeOnly ctx $ E e
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Kept => do
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let ty = sub1 ret tag
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etag <- eraseElim ctx tag
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arms <- for (SortedMap.toList arms) $ \(t, rhs) => do
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let ty' = sub1 ret (Ann (Tag t loc) etag.type loc)
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rhs' <- eraseTerm ctx ty' rhs
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pure (t, rhs')
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pure $ EraRes ty $ CaseEnum etag.term arms loc
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-- n ⤋ n' ⇒ ℕ z ⤋ z' ⇐ R[zero∷ℕ/z]
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-- ρ.m : ℕ, ς.ih : R[m/z] ⊢ s ⤋ s' ⇐ R[(succ m)∷ℕ/z]
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-- ---------------------------------------------------
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-- caseρ n return z ⇒ R of {0 ⇒ z; succ m, ς.ih ⇒ s}
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-- ⤋
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-- case n' of {0 ⇒ z'; succ m, ih ⇒ s'}
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-- ⇒ R[n/z]
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eraseElim ctx (CaseNat qty qtyIH nat ret zero succ loc) = do
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let ty = sub1 ret nat
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enat <- eraseElim ctx nat
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zero <- eraseTerm ctx (sub1 ret (Ann (Zero loc) (Nat loc) loc)) zero
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let [< p, ih] = succ.names
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succ <- eraseTerm
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(extendTyN [< (qty, p, Nat loc),
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(qtyIH, ih, sub1 (ret // shift 1) (BV 0 loc))] ctx)
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(sub1 (ret // shift 2) (Ann (Succ (BVT 1 loc) loc) (Nat loc) loc))
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succ.term
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pure $ EraRes ty $ CaseNat enat.term zero p ih succ loc
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-- b ⤋ b' ⇒ [π.A] π ≠ 0
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-- πρ.x : A ⊢ s ⤋ s' ⇐ R[[x]∷[π.A]/z]
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-- -------------------------------------------------------
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-- caseρ b return z ⇒ R of {[x] ⇒ s} ⤋ s'[b'/x] ⇒ R[b/z]
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--
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-- b ⇒ [0.A] 0.x : A ⊢ s ⤋ s' ⇐ R[[x]∷[0.A]/z]
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-- -------------------------------------------------------
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-- caseρ b return z ⇒ R of {[x] ⇒ s} ⤋ s'[⌷/x] ⇒ R[b/z]
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eraseElim ctx (CaseBox qty box ret body loc) = do
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tbox <- computeElimType ctx SOne box -- [fixme] is there any way to avoid this?
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(pi, tinner) <- expectBOX ctx loc tbox
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let ctx' = extendTy Zero body.name tinner ctx
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bty = sub1 (ret // shift 1) $
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Ann (Box (BVT 0 loc) loc) (weakT 1 tbox) loc
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case isErased pi of
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Kept => do
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ebox <- eraseElim ctx box
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ebody <- eraseTerm ctx' bty body.term
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pure $ EraRes (sub1 ret box) $ ebody // one ebox.term
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Erased => do
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body' <- eraseTerm ctx' bty body.term
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pure $ EraRes (sub1 ret box) $ body' // one (Erased loc)
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-- f ⤋ f' ⇒ Eq (𝑖 ⇒ A) l r
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-- ------------------------------
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-- f @r ⤋ f' ⇒ A‹r/𝑖›
|
||||
eraseElim ctx (DApp fun arg loc) = do
|
||||
efun <- eraseElim ctx fun
|
||||
a <- fst <$> expectEq ctx loc efun.type
|
||||
pure $ EraRes (dsub1 a arg) efun.term
|
||||
|
||||
-- s ⤋ s' ⇐ A
|
||||
-- ----------------
|
||||
-- s ∷ A ⤋ s' ⇒ A
|
||||
eraseElim ctx (Ann tm ty loc) =
|
||||
EraRes ty <$> eraseTerm ctx ty tm
|
||||
|
||||
-- s ⤋ s' ⇐ A‹p/𝑖›
|
||||
-- -----------------------------------
|
||||
-- coe (𝑖 ⇒ A) @p @q s ⤋ s' ⇒ A‹q/𝑖›
|
||||
eraseElim ctx (Coe ty p q val loc) = do
|
||||
val <- eraseTerm ctx (dsub1 ty p) val
|
||||
pure $ EraRes (dsub1 ty q) val
|
||||
|
||||
-- s ⤋ s' ⇐ A
|
||||
-- --------------------------------
|
||||
-- comp A @p @q s @r {⋯} ⤋ s' ⇒ A
|
||||
--
|
||||
-- [todo] is this ok? they are equal, but even so,
|
||||
-- maybe t₀ and t₁ have different performance characteristics
|
||||
eraseElim ctx (Comp ty p q val r zero one loc) =
|
||||
EraRes ty <$> eraseTerm ctx ty val
|
||||
|
||||
eraseElim ctx t@(TypeCase ty ret arms def loc) =
|
||||
throw $ CompileTimeOnly ctx $ E t
|
||||
|
||||
eraseElim ctx (CloE (Sub term th)) =
|
||||
eraseElim ctx $ pushSubstsWith' id th term
|
||||
|
||||
eraseElim ctx (DCloE (Sub term th)) =
|
||||
eraseElim ctx $ pushSubstsWith' th id term
|
||||
|
|
@ -57,4 +57,5 @@ modules =
|
|||
Quox.Parser.FromParser,
|
||||
Quox.Parser.FromParser.Error,
|
||||
Quox.Parser,
|
||||
Quox.Untyped.Syntax
|
||||
Quox.Untyped.Syntax,
|
||||
Quox.Untyped.Erase
|
||||
|
|
|
|||
Loading…
Reference in a new issue