400 lines
13 KiB
Idris
400 lines
13 KiB
Idris
module Quox.Typing.Error
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import Quox.Loc
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import Quox.Syntax
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import Quox.Typing.Context
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import Quox.Typing.EqMode
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import Quox.Pretty
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import Data.List
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import Control.Eff
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public export
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record NameContexts d n where
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constructor MkNameContexts
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dnames : BContext d
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tnames : BContext n
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namespace NameContexts
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export
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empty : NameContexts 0 0
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empty = MkNameContexts [<] [<]
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export
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extendDimN : BContext s -> NameContexts d n -> NameContexts (s + d) n
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extendDimN xs = {dnames $= (++ toSnocVect' xs)}
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export
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extendDim : BindName -> NameContexts d n -> NameContexts (S d) n
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extendDim i = extendDimN [< i]
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namespace TyContext
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public export
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(.names) : TyContext d n -> NameContexts d n
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(MkTyContext {dnames, tnames, _}).names =
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MkNameContexts {dnames, tnames}
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namespace EqContext
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public export
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(.names) : (e : EqContext n) -> NameContexts e.dimLen n
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(MkEqContext {dnames, tnames, _}).names =
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MkNameContexts {dnames, tnames}
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public export
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(.names0) : EqContext n -> NameContexts 0 n
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(MkEqContext {tnames, _}).names0 =
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MkNameContexts {dnames = [<], tnames}
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namespace WhnfContext
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public export
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(.names) : WhnfContext d n -> NameContexts d n
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(MkWhnfContext {dnames, tnames, _}).names =
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MkNameContexts {dnames, tnames}
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public export
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data Error
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= ExpectedTYPE Loc (NameContexts d n) (Term d n)
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| ExpectedPi Loc (NameContexts d n) (Term d n)
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| ExpectedSig Loc (NameContexts d n) (Term d n)
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| ExpectedEnum Loc (NameContexts d n) (Term d n)
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| ExpectedEq Loc (NameContexts d n) (Term d n)
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| ExpectedNat Loc (NameContexts d n) (Term d n)
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| ExpectedBOX Loc (NameContexts d n) (Term d n)
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| BadUniverse Loc Universe Universe
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| TagNotIn Loc TagVal (SortedSet TagVal)
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| BadCaseEnum Loc (SortedSet TagVal) (SortedSet TagVal)
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| BadQtys Loc String (TyContext d n) (List (QOutput n, Term d n))
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-- first term arg of ClashT is the type
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| ClashT Loc (EqContext n) EqMode (Term 0 n) (Term 0 n) (Term 0 n)
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| ClashTy Loc (EqContext n) EqMode (Term 0 n) (Term 0 n)
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| ClashE Loc (EqContext n) EqMode (Elim 0 n) (Elim 0 n)
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| ClashU Loc EqMode Universe Universe
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| ClashQ Loc Qty Qty
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| NotInScope Loc Name
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| NotType Loc (TyContext d n) (Term d n)
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| WrongType Loc (EqContext n) (Term 0 n) (Term 0 n)
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| MissingEnumArm Loc TagVal (List TagVal)
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-- extra context
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| WhileChecking
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(TyContext d n) Qty
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(Term d n) -- term
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(Term d n) -- type
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Error
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| WhileCheckingTy
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(TyContext d n)
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(Term d n)
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(Maybe Universe)
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Error
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| WhileInferring
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(TyContext d n) Qty
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(Elim d n)
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Error
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| WhileComparingT
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(EqContext n) EqMode
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(Term 0 n) -- type
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(Term 0 n) (Term 0 n) -- lhs/rhs
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Error
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| WhileComparingE
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(EqContext n) EqMode
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(Elim 0 n) (Elim 0 n)
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Error
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%name Error err
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public export
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ErrorEff : Type -> Type
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ErrorEff = Except Error
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export
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Located Error where
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(ExpectedTYPE loc _ _).loc = loc
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(ExpectedPi loc _ _).loc = loc
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(ExpectedSig loc _ _).loc = loc
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(ExpectedEnum loc _ _).loc = loc
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(ExpectedEq loc _ _).loc = loc
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(ExpectedNat loc _ _).loc = loc
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(ExpectedBOX loc _ _).loc = loc
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(BadUniverse loc _ _).loc = loc
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(TagNotIn loc _ _).loc = loc
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(BadCaseEnum loc _ _).loc = loc
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(BadQtys loc _ _ _).loc = loc
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(ClashT loc _ _ _ _ _).loc = loc
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(ClashTy loc _ _ _ _).loc = loc
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(ClashE loc _ _ _ _).loc = loc
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(ClashU loc _ _ _).loc = loc
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(ClashQ loc _ _).loc = loc
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(NotInScope loc _).loc = loc
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(NotType loc _ _).loc = loc
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(WrongType loc _ _ _).loc = loc
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(MissingEnumArm loc _ _).loc = loc
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(WhileChecking _ _ _ _ err).loc = err.loc
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(WhileCheckingTy _ _ _ err).loc = err.loc
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(WhileInferring _ _ _ err).loc = err.loc
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(WhileComparingT _ _ _ _ _ err).loc = err.loc
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(WhileComparingE _ _ _ _ err).loc = err.loc
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||| separates out all the error context layers
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||| (e.g. "while checking s : A, …")
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export
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explodeContext : Error -> (List (Error -> Error), Error)
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explodeContext (WhileChecking ctx x s t err) =
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mapFst (WhileChecking ctx x s t ::) $ explodeContext err
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explodeContext (WhileCheckingTy ctx s k err) =
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mapFst (WhileCheckingTy ctx s k ::) $ explodeContext err
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explodeContext (WhileInferring ctx x e err) =
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mapFst (WhileInferring ctx x e ::) $ explodeContext err
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explodeContext (WhileComparingT ctx x s t r err) =
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mapFst (WhileComparingT ctx x s t r ::) $ explodeContext err
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explodeContext (WhileComparingE ctx x e f err) =
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mapFst (WhileComparingE ctx x e f ::) $ explodeContext err
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explodeContext err = ([], err)
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||| leaves the outermost context layer, and the innermost (up to) n, and removes
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||| the rest if there are more than n+1 in total
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export
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trimContext : Nat -> Error -> Error
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trimContext n err =
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case explodeContext err of
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([], err) => err
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(f :: fs, err) => f $ foldr apply err $ takeEnd n fs
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where
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takeEnd : Nat -> List a -> List a
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takeEnd n = reverse . take n . reverse
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private
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expect : Has (Except e) fs =>
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(a -> a -> e) -> (a -> a -> Bool) -> a -> a -> Eff fs ()
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expect err cmp x y = unless (x `cmp` y) $ throw $ err x y
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parameters {auto _ : Has ErrorEff fs} (loc : Loc)
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export %inline
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expectEqualQ : Qty -> Qty -> Eff fs ()
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expectEqualQ = expect (ClashQ loc) (==)
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export %inline
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expectCompatQ : Qty -> Qty -> Eff fs ()
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expectCompatQ = expect (ClashQ loc) compat
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export %inline
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expectModeU : EqMode -> Universe -> Universe -> Eff fs ()
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expectModeU mode = expect (ClashU loc mode) $ ucmp mode
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private
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prettyMode : EqMode -> String
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prettyMode Equal = "equal to"
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prettyMode Sub = "a subtype of"
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prettyMode Super = "a supertype of"
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private
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prettyModeU : EqMode -> String
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prettyModeU Equal = "equal to"
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prettyModeU Sub = "less than or equal to"
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prettyModeU Super = "greater than or equal to"
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private
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isTypeInUniverse : Maybe Universe -> String
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isTypeInUniverse Nothing = "is a type"
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isTypeInUniverse (Just k) = "is a type in universe \{show k}"
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private
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filterSameQtys : BContext n -> List (QOutput n, z) ->
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Exists $ \n' => (BContext n', List (QOutput n', z))
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filterSameQtys [<] qts = Evidence 0 ([<], qts)
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filterSameQtys (ns :< n) qts =
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let (qs, qts) = unzip $ map (\(qs :< q, t) => (q, qs, t)) qts
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Evidence l (ns, qts) = filterSameQtys ns qts
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in
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if allSame qs
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then Evidence l (ns, qts)
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else Evidence (S l) (ns :< n, zipWith (\(qs, t), q => (qs :< q, t)) qts qs)
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where
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allSame : List Qty -> Bool
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allSame [] = True
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allSame (q :: qs) = all (== q) qs
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private
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printCaseQtys : {opts : _} -> TyContext d n ->
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BContext n' -> List (QOutput n', Term d n) ->
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Eff Pretty (List (Doc opts))
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printCaseQtys ctx ns qts =
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let Evidence _ (ns, qts) = filterSameQtys ns qts in
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traverse (line ns) qts
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where
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line : BContext l -> (QOutput l, Term d n) -> Eff Pretty (Doc opts)
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line ns (qs, t) = map (("-" <++>) . sep) $ sequence
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[hangDSingle "the term"
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!(prettyTerm ctx.dnames ctx.tnames t),
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hangDSingle "uses variables" $
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separateTight !commaD $ toSnocList' !(traverse prettyTBind ns),
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hangDSingle "with quantities" $
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separateTight !commaD $ toSnocList' !(traverse prettyQty qs)]
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export
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prettyErrorNoLoc : {opts : _} -> (showContext : Bool) -> Error ->
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Eff Pretty (Doc opts)
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prettyErrorNoLoc showContext = \case
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ExpectedTYPE _ ctx s =>
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hangDSingle "expected a type universe, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedPi _ ctx s =>
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hangDSingle "expected a function type, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedSig _ ctx s =>
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hangDSingle "expected a pair type, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedEnum _ ctx s =>
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hangDSingle "expected an enumeration type, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedEq _ ctx s =>
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hangDSingle "expected an enumeration type, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedNat _ ctx s =>
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hangDSingle
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("expected the type" <++>
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!(prettyTerm [<] [<] $ Nat noLoc) <+> ", but got")
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!(prettyTerm ctx.dnames ctx.tnames s)
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ExpectedBOX _ ctx s =>
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hangDSingle "expected a box type, but got"
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!(prettyTerm ctx.dnames ctx.tnames s)
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BadUniverse _ k l => pure $
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sep ["the universe level" <++> !(prettyUniverse k),
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"is not strictly less than" <++> !(prettyUniverse l)]
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TagNotIn _ tag set =>
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hangDSingle (hsep ["the tag", !(prettyTag tag), "is not contained in"])
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!(prettyTerm [<] [<] $ Enum set noLoc)
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BadCaseEnum _ head body => sep <$> sequence
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[hangDSingle "case expression has head of type"
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!(prettyTerm [<] [<] $ Enum head noLoc),
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hangDSingle "but cases for"
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!(prettyTerm [<] [<] $ Enum body noLoc)]
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BadQtys _ what ctx arms =>
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hangDSingle (text "inconsistent variable usage in \{what}") $
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sep !(printCaseQtys ctx ctx.tnames arms)
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ClashT _ ctx mode ty s t =>
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inEContext ctx . sep =<< sequence
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[hangDSingle "the term" !(prettyTerm [<] ctx.tnames s),
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hangDSingle (text "is not \{prettyMode mode}")
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!(prettyTerm [<] ctx.tnames t),
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hangDSingle "at type" !(prettyTerm [<] ctx.tnames ty)]
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ClashTy _ ctx mode a b =>
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inEContext ctx . sep =<< sequence
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[hangDSingle "the type" !(prettyTerm [<] ctx.tnames a),
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hangDSingle (text "is not \{prettyMode mode}")
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!(prettyTerm [<] ctx.tnames b)]
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ClashE _ ctx mode e f =>
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inEContext ctx . sep =<< sequence
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[hangDSingle "the term" !(prettyElim [<] ctx.tnames e),
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hangDSingle (text "is not \{prettyMode mode}")
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!(prettyElim [<] ctx.tnames f)]
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ClashU _ mode k l => pure $
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sep ["the universe level" <++> !(prettyUniverse k),
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text "is not \{prettyModeU mode}" <++> !(prettyUniverse l)]
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ClashQ _ pi rh => pure $
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sep ["the quantity" <++> !(prettyQty pi),
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"is not equal to" <++> !(prettyQty rh)]
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NotInScope _ x => pure $
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hsep [!(prettyFree x), "is not in scope"]
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NotType _ ctx s =>
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inTContext ctx . sep =<< sequence
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[hangDSingle "the term" !(prettyTerm ctx.dnames ctx.tnames s),
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pure "is not a type"]
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WrongType _ ctx ty s =>
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inEContext ctx . sep =<< sequence
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[hangDSingle "the term" !(prettyTerm [<] ctx.tnames s),
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hangDSingle "cannot have type" !(prettyTerm [<] ctx.tnames ty)]
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MissingEnumArm _ tag tags => pure $
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sep [hsep ["the tag", !(prettyTag tag), "is not contained in"],
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!(prettyTerm [<] [<] $ Enum (fromList tags) noLoc)]
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WhileChecking ctx pi s a err =>
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[|vappendBlank
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(inTContext ctx . sep =<< sequence
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[hangDSingle "while checking" !(prettyTerm ctx.dnames ctx.tnames s),
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hangDSingle "has type" !(prettyTerm ctx.dnames ctx.tnames a),
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hangDSingle "with quantity" !(prettyQty pi)])
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(prettyErrorNoLoc showContext err)|]
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WhileCheckingTy ctx a k err =>
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[|vappendBlank
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(inTContext ctx . sep =<< sequence
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[hangDSingle "while checking" !(prettyTerm ctx.dnames ctx.tnames a),
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pure $ text $ isTypeInUniverse k])
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(prettyErrorNoLoc showContext err)|]
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WhileInferring ctx pi e err =>
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[|vappendBlank
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(inTContext ctx . sep =<< sequence
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[hangDSingle "while inferring the type of"
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!(prettyElim ctx.dnames ctx.tnames e),
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hangDSingle "with quantity" !(prettyQty pi)])
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(prettyErrorNoLoc showContext err)|]
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WhileComparingT ctx mode a s t err =>
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[|vappendBlank
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(inEContext ctx . sep =<< sequence
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[hangDSingle "while checking that" !(prettyTerm [<] ctx.tnames s),
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hangDSingle (text "is \{prettyMode mode}")
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!(prettyTerm [<] ctx.tnames t),
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hangDSingle "at type" !(prettyTerm [<] ctx.tnames a)])
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(prettyErrorNoLoc showContext err)|]
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WhileComparingE ctx mode e f err =>
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[|vappendBlank
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(inEContext ctx . sep =<< sequence
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[hangDSingle "while checking that" !(prettyElim [<] ctx.tnames e),
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hangDSingle (text "is \{prettyMode mode}")
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!(prettyElim [<] ctx.tnames f)])
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(prettyErrorNoLoc showContext err)|]
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where
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vappendBlank : Doc opts -> Doc opts -> Doc opts
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vappendBlank a b = flush a `vappend` b
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inTContext : TyContext d n -> Doc opts -> Eff Pretty (Doc opts)
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inTContext ctx doc =
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if showContext && not (null ctx) then
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pure $ vappend doc (sep ["in context", !(prettyTyContext ctx)])
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else pure doc
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inEContext : EqContext n -> Doc opts -> Eff Pretty (Doc opts)
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inEContext ctx doc =
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if showContext && not (null ctx) then
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pure $ vappend doc (sep ["in context", !(prettyEqContext ctx)])
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else pure doc
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export
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prettyError : {opts : _} -> (showContext : Bool) ->
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Error -> Eff Pretty (Doc opts)
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prettyError showContext err = sep <$> sequence
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[prettyLoc err.loc, indentD =<< prettyErrorNoLoc showContext err]
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