poly-rec (empty) → 0.6.0.0
raw patch · 7 files changed
+1267/−0 lines, 7 filesdep +basedep +requirementssetup-changed
Dependencies added: base, requirements
Files
- CHANGELOG.md +0/−0
- LICENSE +674/−0
- Setup.hs +2/−0
- poly-rec.cabal +30/−0
- src/Data/GenRec.hs +416/−0
- src/Data/GenRec/Label.hs +29/−0
- src/Data/GenRec/RecInstances/Record.hs +116/−0
+ CHANGELOG.md view
+ LICENSE view
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+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ poly-rec.cabal view
@@ -0,0 +1,30 @@+-- Initial polykheXrec.cabal generated by cabal init. For further+-- documentation, see http://haskell.org/cabal/users-guide/++name: poly-rec+version: 0.6.0.0+synopsis: Polykinded extensible records+description: Extensible records/row polymorphism for Haskell. Fields are polykinded,+ to statically check rich structures. This library was initially conceived+ as part of the AspectAG project.+license: GPL-3+license-file: LICENSE+author: Juan García-Garland+maintainer: jpgarcia@fing.edu.uy+copyright: 2020, Juan García-Garland, Marcos Viera, Alberto Pardo+category: Data+build-type: Simple+extra-source-files: CHANGELOG.md+cabal-version: >=1.10++library+ exposed-modules: Data.GenRec,+ Data.GenRec.Label,+ Data.GenRec.RecInstances.Record+ + -- other-modules:+ -- other-extensions:+ build-depends: requirements >= 0.6.0.0 && < 0.7,+ base >=4.11 && <4.15+ hs-source-dirs: src+ default-language: Haskell2010
+ src/Data/GenRec.hs view
@@ -0,0 +1,416 @@+{-|+Module : Data.GenRecord+Description : polykinded extensible record library+Copyright : (c) Juan García Garland,+ Marcos Viera, 2019-2020+License : GPL+Maintainer : jpgarcia@fing.edu.uy+Stability : experimental+Portability : POSIX++Extensible records/row polymorphism are features not implemented in+Haskell. Some other functional languages do it, like Purescript. GHC+extensions allowing type level-programming allow us to encode them in+Haskell.++Let us define records as a (partial) mapping from names (fields, wich+are static) to values.++There are many implementations out there. This is yet another one,+inspired in the HList library. It arose when programming the AspectAG+library. Before, we depended on HList. Then we choose to implement a+record library from scratch for two reasons:++ * HList is experimental, it does not maintain a stable interface.+ * We prefer a solution that fits better in our use case.++AspectAG is a library to encode type safe attribute grammars.+Statically checked extensible records are used everywhere, knowing at+compile time the structure of the grammar, and checking if it is+well-formed.++Some example structures in AspectAG library are:++* Records: that's it, plane extensible records: Mappings from names to+ values.++* Attributions: mappings from attribute names to values. This is the+ same idea that the one for records, but we wanted to have different+ types for each structure, and for each label. This means that our+ labels must be polyinded.++* Children Records: That is a map from children to attibutions. It is+ a record of records. ++One common way to implement a record is by using a GADT. For instance indexed by+the list of pairs (label, value). We want labels polykinded, and values are+usually of kind Type, what makes sense since Type is the kind of+inhabited types, and records store values. However, in cases such as+our children records, where we store attributions that are also+represented by an indexed GADT, we would like to be able to reflect+some of this structural information at the indexes of the record. This+can be achieved if we are polymorphic in the kind of the types+corresponding to the record fields.+-}++{-# OPTIONS_GHC -fno-warn-missing-methods #-}++{-# LANGUAGE DataKinds,+ TypeOperators,+ PolyKinds,+ GADTs,+ TypeInType,+ RankNTypes,+ StandaloneDeriving,+ FlexibleInstances,+ FlexibleContexts,+ ConstraintKinds,+ MultiParamTypeClasses,+ FunctionalDependencies,+ UndecidableInstances,+ ScopedTypeVariables,+ TypeFamilies,+ InstanceSigs,+ AllowAmbiguousTypes,+ TypeApplications,+ PatternSynonyms+#-}++module Data.GenRec+ (+ Rec(ConsRec, EmptyRec),+ TagField(TagField),+ WrapField,+ UnWrap,+ untagField,+ (.=.),+ (#),+ (.*.),+ Cmp,+ ShowRec,+ ShowField,+ OpLookup(OpLookup),+ lookup,+ OpExtend(OpExtend),+ -- extend, TODO+ OpUpdate(OpUpdate),+ update,+ emptyGenRec,+ module Data.GenRec.Label+ ) where++import Data.Kind+import Data.Proxy+import Data.GenRec.Label+import Data.Type.Require+import Prelude hiding (lookup)++import GHC.TypeLits+++type family a == b where+ a == b = Equal a b+++-- | Record data structure for generic records (Internal). The `c`+-- index indicates the kind of record (for each record instance, the+-- user should define an index). The `r` index represents the mapping+-- from labels to values. Labels are of kind `k'`. Values are still+-- polykinded (`k''`) since rich information can be statically+-- represented here (for instance, when a record of records, or a+-- record of Vectors is represented). `k'` must implement the `Cmp`+-- family, although it is not visible here for simplicity. Records are+-- built putting fields ordered according to the `Cmp` result of its+-- labels. __This constructors are not intended to be used to build__+-- __records__, (`ConsRec` is the problematic one). Use the smart+-- constructors `emptyRecord` and `.*.` instead. We export the+-- constructors to pattern match on them. Although there are solutions+-- to hide Constructors while supporting pattern matching, we kept+-- it simple++data Rec (c :: k) (r :: [(k', k'')]) :: Type where+ EmptyRec :: Rec c '[] -- ^ empty record+ ConsRec :: TagField c l v -> Rec c r -> Rec c ('( l, v) ': r) -- ^+-- `ConsRec` takes a tagged field (`TagField`) and a record, to build+-- a new record. Recall that fields should be ordered.++-- | The empty Record. Note that it is polymorphic on the kind of record `c`.+emptyGenRec = EmptyRec++-- | 'TagField'+data TagField (c :: k) (l :: k') (v :: k'') where+ TagField :: Label c -> Label l -> WrapField c v -> TagField c l v -- ^+-- `TagField` tags a value `v` with record and label information. `v`+-- is polykinded, for instance we could be tagging some kind of+-- record, because then we would build a matrix. In that case 'k''+-- could be something as `[(kindforlabels, Type)]`. But `TagField`+-- contains inhabited values, it tags values of a type of kind `Type`.+-- In this example perhaps some value of+-- type `Rec Something [(kindforlabels, Type)]`.+-- That is the role of the `WrapField` family. Given `c`, the kind of+-- record, and `v`, ir computes the wrapper.+++-- | TagField operator, note that 'c' will be ambiguous if not annotated.+infix 4 .=.+(l :: Label l) .=. (v :: v) = TagField Label l v+++-- | Given a type of record and its index, it computes the type of+-- record inhabitants+type family WrapField (c :: k') (v :: k) :: Type+++-- | The inverse of `WrapField`+type family UnWrap (t :: Type) :: [(k,k')]+type instance UnWrap (Rec c (r :: [(k, k')])) = (r :: [(k, k')])++-- | This is the destructor of `TagField`. Note the use of `WrapField` here.+untagField :: TagField c l v -> WrapField c v+untagField (TagField lc lv v) = v++-- | comparisson of Labels, this family is polykinded, each record-like+-- structure must implement this family for its labels+type family Cmp (a :: k) (b :: k) :: Ordering++-- | Instance for Symbols+type instance Cmp (a :: Symbol) (b :: Symbol) = CmpSymbol a b+++-- | Function to show the name of records (Record, Mapping, etc):+type family ShowRec c :: Symbol++-- | Function to show the field of the record ("field named", "children", "tag:", etc)+type family ShowField c :: Symbol+++-- * Operations++-- ** Lookup++-- | Datatype for lookup (wrapper)+data OpLookup (c :: Type)+ (l :: k)+ (r :: [(k, k')]) :: Type where+ OpLookup :: Label l -> Rec c r -> OpLookup c l r++-- | Datatype for lookup (internal)+data OpLookup' (b :: Ordering)+ (c :: Type)+ (l :: k)+ (r :: [(k, k')]) :: Type where+ OpLookup' :: Proxy b -> Label l -> Rec c r -> OpLookup' b c l r++-- | wrapper instance+instance+ Require (OpLookup' (Cmp l l') c l ('( l', v) ': r)) ctx+ =>+ Require (OpLookup c l ('( l', v) ': r)) ctx where+ type ReqR (OpLookup c l ('( l', v) ': r)) =+ ReqR (OpLookup' (Cmp l l') c l ('( l', v) ': r))+ req ctx (OpLookup l r) =+ req ctx (OpLookup' (Proxy @(Cmp l l')) l r)++-- | error instance (looking up an empty record)+instance+ Require (OpError (Text "field not Found on " :<>: Text (ShowRec c)+ :$$: Text "looking up the " :<>: Text (ShowField c)+ :<>: Text " " :<>: ShowTE l+ )) ctx+ =>+ Require (OpLookup c l ( '[] :: [(k,k')])) ctx where+ type ReqR (OpLookup c l ('[] :: [(k,k')]) ) = ()+ req = undefined++-- | label found!+instance+ Require (OpLookup' 'EQ c l ( '(l, v) ': r)) ctx where+ type ReqR (OpLookup' 'EQ c l ( '(l, v) ': r)) =+ WrapField c v+ req Proxy (OpLookup' Proxy Label (ConsRec f _)) =+ untagField f++-- | label not {yet} found+instance (Require (OpLookup c l r) ctx)+ =>+ Require (OpLookup' 'GT c l ( '(l', v) ': r)) ctx where+ type ReqR (OpLookup' 'GT c l ( '(l', v) ': r)) =+ ReqR (OpLookup c l r)+ req ctx (OpLookup' Proxy l (ConsRec _ r)) =+ req ctx (OpLookup l r)++-- | ERROR, we are beyond the supposed position for the label |l|,+-- so we can assert there is no field labelled |l|+-- (ot the record is ill-formed)+instance Require (OpError (Text "field not Found on " :<>: Text (ShowRec c)+ :$$: Text "looking up the " :<>: Text (ShowField c)+ :<>: Text " " :<>: ShowTE l+ )) ctx+ =>+ Require (OpLookup' 'LT c l ( '(l', v) ': r)) ctx where+ type ReqR (OpLookup' 'LT c l ( '(l', v) ': r)) = ()+ req ctx (OpLookup' Proxy l (ConsRec _ r)) = ()++-- | Pretty lookup+(#) :: RequireR (OpLookup c l r) '[] v =>+ Rec c r -> Label l -> v+r # l = req (Proxy @ '[]) (OpLookup l r)+++-- ** update++-- | update operator (wrapper)+data OpUpdate (c :: Type)+ (l :: k)+ (v :: k')+ (r :: [(k, k')]) :: Type where+ OpUpdate :: Label l -> WrapField c v -> Rec c r+ -> OpUpdate c l v r++-- | update operator (internal)+data OpUpdate' (b :: Ordering)+ (c :: Type)+ (l :: k)+ (v :: k')+ (r :: [(k, k')]) :: Type where+ OpUpdate' :: Proxy b -> Label l -> WrapField c v -> Rec c r+ -> OpUpdate' b c l v r++-- | wrapper instance+instance (Require (OpUpdate' (Cmp l l') c l v ( '(l', v') ': r) ) ctx )+ =>+ Require (OpUpdate c l v ( '(l', v') ': r) ) ctx where+ type ReqR (OpUpdate c l v ( '(l', v') ': r) ) =+ ReqR (OpUpdate' (Cmp l l') c l v ( '(l', v') ': r) )+ req ctx (OpUpdate l f r) =+ (req @(OpUpdate' (Cmp l l') _ _ v _ ))+ ctx (OpUpdate' (Proxy @(Cmp l l')) l f r)++-- | error instance+instance (Require (OpError (Text "field not Found on " :<>: Text (ShowRec c)+ :$$: Text "updating the " :<>: Text (ShowField c)+ :<>: ShowTE l)) ctx)+ =>+ Require (OpUpdate c l v '[]) ctx where+ type ReqR (OpUpdate c l v ('[] ) ) = Rec c '[]+ req = undefined++-- | label found+instance + Require (OpUpdate' 'EQ c l v ( '(l, v') ': r)) ctx where+ type ReqR (OpUpdate' 'EQ c l v ( '(l, v') ': r)) =+ Rec c ( '(l, v) ': r)+ req ctx (OpUpdate' proxy label field (ConsRec tgf r)) =+ ConsRec (TagField Label label field) r++instance+ ( Require (OpUpdate c l v r) ctx+ , ( '(l', v') : r0) ~ a -- only to unify kinds+ , ReqR (OpUpdate c l v r) ~ Rec c r0+ )+ =>+ Require (OpUpdate' 'GT c l v ( '(l',v') ': r)) ctx where+ type ReqR (OpUpdate' 'GT c l v ( '(l',v') ': r)) =+ Rec c ( '(l',v') ': (UnWrap (ReqR (OpUpdate c l v r))))+ req ctx (OpUpdate' _ l f (ConsRec field (r :: Rec c r))) =+ ConsRec field $ (req @(OpUpdate _ _ v r)) ctx (OpUpdate l f r)++-- | ERROR, we are beyond the supposed position for the label |l|,+-- so we can assert there is no field labelled with |l| to update+-- (or the record is ill-formed)+instance (Require (OpError (Text "field not Found on " :<>: Text (ShowRec c)+ :$$: Text "updating the " :<>: Text (ShowField c)+ :<>: ShowTE l)) ctx)+ =>+ Require (OpUpdate' 'LT c l v ( '(l',v') ': r)) ctx where+ type ReqR (OpUpdate' 'LT c l v ( '(l',v') ': r)) =+ ()+ req = undefined++-- | The update function. Given a `Label` and value, and a `Record`+-- containing this label, it updates the value. It could change its+-- type. It raises a custom type error if there is no field+-- labelled with l.+update (l :: Label l) (v :: v) (r :: Rec c r) =+ req Proxy (OpUpdate @l @c @v @r l v r)++-- | The lookup function. Given a `Label` and a `Record`, it returns+-- the field at that position. It raises a custom type+-- error if there is no field labelled with l.+lookup (l :: Label l) (r :: Rec c r) =+ req Proxy (OpLookup @c @l @r l r)++-- ** Extension++-- | extension operator (wrapper)+data OpExtend (c :: Type)+ (l :: k)+ (v :: k')+ (r :: [(k, k')]) :: Type where+ OpExtend :: Label l -> WrapField c v -> Rec c r+ -> OpExtend c l v r++-- | Extension operator (inner)+data OpExtend' (b :: Ordering)+ (c :: Type)+ (l :: k)+ (v :: k')+ (r :: [(k, k')]) :: Type where+ OpExtend' :: Proxy b -> Label l -> WrapField c v -> Rec c r+ -> OpExtend' b c l v r++-- | extending an empty record+instance+ Require (OpExtend c l v '[]) ctx where+ type ReqR (OpExtend c l v '[]) =+ Rec c '[ '(l , v)]+ req ctx (OpExtend l v EmptyRec) =+ ConsRec (TagField (Label @c) l v) EmptyRec++-- | wrapper instance++instance+ Require (OpExtend' (Cmp l l') c l v ('(l', v') : r)) ctx+ =>+ Require (OpExtend c l v ( '(l', v') ': r)) ctx where+ type ReqR (OpExtend c l v ( '(l', v') ': r)) =+ ReqR (OpExtend' (Cmp l l') c l v ( '(l', v') ': r))+ req ctx (OpExtend l v (r :: Rec c ( '(l', v') ': r)) ) =+ req ctx (OpExtend' @(Cmp l l') @l @c @v Proxy l v r)++-- | keep looking+instance+ (Require (OpExtend c l v r) ctx+ , ( '(l', v') ': r0 ) ~ a+ , ReqR (OpExtend c l v r) ~ Rec c r0+ )+ =>+ Require (OpExtend' 'GT c l v ( '(l', v') ': r)) ctx where+ type ReqR (OpExtend' 'GT c l v ( '(l', v') ': r)) =+ Rec c ( '(l', v') ': UnWrap (ReqR (OpExtend c l v r)))+ req ctx (OpExtend' Proxy l v (ConsRec lv r)) =+ ConsRec lv $ req ctx (OpExtend @_ @_ @v l v r)++instance+ Require (OpExtend' 'LT c l v ( '(l', v') ': r)) ctx where+ type ReqR (OpExtend' 'LT c l v ( '(l', v') ': r)) =+ Rec c ( '(l, v) ': ( '(l', v') ': r))+ req ctx (OpExtend' Proxy l v r) =+ ConsRec (TagField Label l v) r++instance+ (Require (OpError (Text "cannot extend " :<>: Text (ShowRec c)+ -- :<>: Text " because the label (" :<>: ShowT l+ -- :<>: Text ") already exists"+ :$$: Text "colision in " :<>: Text (ShowField c)+ :<>: Text " ":<>: ShowTE l)) ctx)+ =>+ Require (OpExtend' 'EQ c l v ( '(l, v') ': r)) ctx where+ type ReqR (OpExtend' 'EQ c l v ( '(l, v') ': r)) = ()+ req ctx = undefined+++-- | '.*.' the pretty cons, hiding require+infixr 2 .*.+(TagField c l v :: TagField c l v) .*. (r :: Rec c r) =+ req emptyCtx (OpExtend @l @c @v @r l v r)
+ src/Data/GenRec/Label.hs view
@@ -0,0 +1,29 @@+{-|+Module : Language.Grammars.AspectAG.Label+Description : Labels (polykinded, phantom)+Copyright : (c) Juan García Garland, Marcos Viera 2020+License : GPL-3+Maintainer : jpgarcia@fing.edu.uy+Stability : experimental+Portability : POSIX+-}++{-# LANGUAGE PolyKinds #-}+{-# LANGUAGE DataKinds #-}++module Data.GenRec.Label where+import Data.Proxy++data Label l = Label++sndLabel :: Label '(a,b) -> Label b+sndLabel _ = undefined++fstLabel :: Label '(a,b) -> Label a+fstLabel _ = undefined++labelFromType :: a -> Label a+labelFromType _ = Label++proxyToLabel :: Proxy a -> Label a+proxyToLabel _ = Label
+ src/Data/GenRec/RecInstances/Record.hs view
@@ -0,0 +1,116 @@+{-# LANGUAGE DataKinds,+ TypeOperators,+ PolyKinds,+ GADTs,+ TypeInType,+ RankNTypes,+ StandaloneDeriving,+ FlexibleInstances,+ FlexibleContexts,+ ConstraintKinds,+ MultiParamTypeClasses,+ FunctionalDependencies,+ UndecidableInstances,+ ScopedTypeVariables,+ TypeFamilies,+ InstanceSigs,+ AllowAmbiguousTypes,+ TypeApplications,+ PatternSynonyms+#-}++module Data.GenRec.RecInstances.Record+ (Record, Reco,+ untag, getLabel,+ (.==.), (.**.), (##),+ emptyRecord+ )+ where++import GHC.TypeLits+import Data.Kind+import Data.Proxy+import Data.GenRec+import Data.GenRec.Label+++-- | * Records++-- | datatype definition+type Record = (Rec Reco :: [(Symbol, Type)] -> Type)++-- | index type+data Reco++-- | field type+type instance WrapField Reco (v :: Type) = v++-- | Type level show utilities+type instance ShowRec Reco = "Record"+type instance ShowField Reco = "field named "+++type Tagged (l :: Symbol) (v :: Type) = TagField Reco l v+pattern Tagged :: v -> Tagged l v+pattern Tagged v = TagField Label Label v+++-- ** Constructors++-- | Pretty Constructor+infix 4 .==.+(.==.) :: Label l -> v -> Tagged l v+l .==. v = Tagged v++-- | For the empty Record+emptyRecord :: Record ('[] :: [(Symbol, Type)])+emptyRecord = EmptyRec++untag :: Tagged l v -> v+untag (TagField _ _ v) = v++-- * Destructors+-- | Get a label+getLabel :: Tagged l v -> Label l+getLabel _ = Label++-- | Lookup+infixl 5 ##+r ## (l :: Label l) = (#) @Reco @l r l++-- | extension+infixr 2 .**.+(lv :: Tagged l v) .**. r = (.*.) lv r+-- The Tagged annotation is enough to unify everything++instance ( Show v+ , KnownSymbol l )+ =>+ Show (Tagged l v) where+ show (Tagged v :: TagField Reco l v) =+ symbolVal (proxyFrom (Label @ l)) ++ " : "++ show v+ where proxyFrom :: Label l -> Proxy l+ proxyFrom _ = Proxy++instance Show (Record '[]) where+ show _ = "{}"++instance ( Show v+ , KnownSymbol l)+ =>+ Show (Record '[ '(l, v)]) where+ show (ConsRec lv EmptyRec) =+ '{' : show lv ++ "}"++instance ( Show v+ , KnownSymbol l+ , Show (Record ( '(l', v') ': r )))+ =>+ Show (Record ( '(l, v) ': '(l', v') ': r )) where+ show (ConsRec lv r) =+ let ('{':shr) = show r+ in '{' : show lv ++ ", " ++ shr++v1 = (Label @"boolean" .==. True) .**. emptyRecord+v2 = (Label @"integer" .==. 3) .**. v1+v3 = (Label @"text" .==. "wa") .**. v2