module Language.PureScript.CoreFn.Desugar (moduleToCoreFn) where
import Prelude.Compat
import Protolude (ordNub)
import Control.Arrow (second)
import Data.Function (on)
import Data.List (sort, sortBy)
import Data.Maybe (mapMaybe)
import Data.Tuple (swap)
import qualified Data.List.NonEmpty as NEL
import qualified Data.Map as M
import Language.PureScript.AST.Literals
import Language.PureScript.AST.SourcePos
import Language.PureScript.AST.Traversals
import Language.PureScript.Comments
import Language.PureScript.CoreFn.Ann
import Language.PureScript.CoreFn.Binders
import Language.PureScript.CoreFn.Expr
import Language.PureScript.CoreFn.Meta
import Language.PureScript.CoreFn.Module
import Language.PureScript.Crash
import Language.PureScript.Environment
import Language.PureScript.Names
import Language.PureScript.Sugar.TypeClasses (typeClassMemberName, superClassDictionaryNames)
import Language.PureScript.Types
import Language.PureScript.PSString (mkString)
import qualified Language.PureScript.AST as A
moduleToCoreFn :: Environment -> A.Module -> Module Ann
moduleToCoreFn _ (A.Module _ _ _ _ Nothing) =
internalError "Module exports were not elaborated before moduleToCoreFn"
moduleToCoreFn env (A.Module modSS coms mn decls (Just exps)) =
let imports = mapMaybe importToCoreFn decls ++ fmap (ssAnn modSS,) (findQualModules decls)
imports' = dedupeImports imports
exps' = ordNub $ concatMap exportToCoreFn exps
externs = ordNub $ mapMaybe externToCoreFn decls
decls' = concatMap declToCoreFn decls
in Module coms mn imports' exps' externs decls'
where
dedupeImports :: [(Ann, ModuleName)] -> [(Ann, ModuleName)]
dedupeImports = fmap swap . M.toList . M.fromListWith const . fmap swap
ssA :: SourceSpan -> Ann
ssA ss = (ss, [], Nothing, Nothing)
declToCoreFn :: A.Declaration -> [Bind Ann]
declToCoreFn (A.DataDeclaration (ss, com) Newtype _ _ [(ctor, _)]) =
[NonRec (ssA ss) (properToIdent ctor) $
Abs (ss, com, Nothing, Just IsNewtype) (Ident "x") (Var (ssAnn ss) $ Qualified Nothing (Ident "x"))]
declToCoreFn d@(A.DataDeclaration _ Newtype _ _ _) =
error $ "Found newtype with multiple constructors: " ++ show d
declToCoreFn (A.DataDeclaration (ss, com) Data tyName _ ctors) =
flip fmap ctors $ \(ctor, _) ->
let (_, _, _, fields) = lookupConstructor env (Qualified (Just mn) ctor)
in NonRec (ssA ss) (properToIdent ctor) $ Constructor (ss, com, Nothing, Nothing) tyName ctor fields
declToCoreFn (A.DataBindingGroupDeclaration ds) =
concatMap declToCoreFn ds
declToCoreFn (A.ValueDeclaration (ss, com) name _ _ [A.MkUnguarded e]) =
[NonRec (ssA ss) name (exprToCoreFn ss com Nothing e)]
declToCoreFn (A.BindingGroupDeclaration ds) =
[Rec . NEL.toList $ fmap (\(((ss, com), name), _, e) -> ((ssA ss, name), exprToCoreFn ss com Nothing e)) ds]
declToCoreFn (A.TypeClassDeclaration sa@(ss, _) name _ supers _ members) =
[NonRec (ssA ss) (properToIdent name) $ mkTypeClassConstructor sa supers members]
declToCoreFn _ = []
exprToCoreFn :: SourceSpan -> [Comment] -> Maybe Type -> A.Expr -> Expr Ann
exprToCoreFn ss com ty (A.Literal lit) =
Literal (ss, com, ty, Nothing) (fmap (exprToCoreFn ss com Nothing) lit)
exprToCoreFn ss com ty (A.Accessor name v) =
Accessor (ss, com, ty, Nothing) name (exprToCoreFn ss [] Nothing v)
exprToCoreFn ss com ty (A.ObjectUpdate obj vs) =
ObjectUpdate (ss, com, ty, Nothing) (exprToCoreFn ss [] Nothing obj) $ fmap (second (exprToCoreFn ss [] Nothing)) vs
exprToCoreFn ss com ty (A.Abs (A.VarBinder name) v) =
Abs (ss, com, ty, Nothing) name (exprToCoreFn ss [] Nothing v)
exprToCoreFn _ _ _ (A.Abs _ _) =
internalError "Abs with Binder argument was not desugared before exprToCoreFn mn"
exprToCoreFn ss com ty (A.App v1 v2) =
App (ss, com, ty, Nothing) (exprToCoreFn ss [] Nothing v1) (exprToCoreFn ss [] Nothing v2)
exprToCoreFn ss com ty (A.Var ident) =
Var (ss, com, ty, getValueMeta ident) ident
exprToCoreFn ss com ty (A.IfThenElse v1 v2 v3) =
Case (ss, com, ty, Nothing) [exprToCoreFn ss [] Nothing v1]
[ CaseAlternative [LiteralBinder (ssAnn ss) $ BooleanLiteral True]
(Right $ exprToCoreFn ss [] Nothing v2)
, CaseAlternative [NullBinder (ssAnn ss)]
(Right $ exprToCoreFn ss [] Nothing v3) ]
exprToCoreFn ss com ty (A.Constructor name) =
Var (ss, com, ty, Just $ getConstructorMeta name) $ fmap properToIdent name
exprToCoreFn ss com ty (A.Case vs alts) =
Case (ss, com, ty, Nothing) (fmap (exprToCoreFn ss [] Nothing) vs) (fmap (altToCoreFn ss) alts)
exprToCoreFn ss com _ (A.TypedValue _ v ty) =
exprToCoreFn ss com (Just ty) v
exprToCoreFn ss com ty (A.Let ds v) =
Let (ss, com, ty, Nothing) (concatMap declToCoreFn ds) (exprToCoreFn ss [] Nothing v)
exprToCoreFn ss com ty (A.TypeClassDictionaryConstructorApp name (A.TypedValue _ lit@(A.Literal (A.ObjectLiteral _)) _)) =
exprToCoreFn ss com ty (A.TypeClassDictionaryConstructorApp name lit)
exprToCoreFn ss com _ (A.TypeClassDictionaryConstructorApp name (A.Literal (A.ObjectLiteral vs))) =
let args = fmap (exprToCoreFn ss [] Nothing . snd) $ sortBy (compare `on` fst) vs
ctor = Var (ss, [], Nothing, Just IsTypeClassConstructor) (fmap properToIdent name)
in foldl (App (ss, com, Nothing, Nothing)) ctor args
exprToCoreFn ss com ty (A.TypeClassDictionaryAccessor _ ident) =
Abs (ss, com, ty, Nothing) (Ident "dict")
(Accessor (ssAnn ss) (mkString $ runIdent ident) (Var (ssAnn ss) $ Qualified Nothing (Ident "dict")))
exprToCoreFn _ com ty (A.PositionedValue ss com1 v) =
exprToCoreFn ss (com ++ com1) ty v
exprToCoreFn _ _ _ e =
error $ "Unexpected value in exprToCoreFn mn: " ++ show e
altToCoreFn :: SourceSpan -> A.CaseAlternative -> CaseAlternative Ann
altToCoreFn ss (A.CaseAlternative bs vs) = CaseAlternative (map (binderToCoreFn ss []) bs) (go vs)
where
go :: [A.GuardedExpr] -> Either [(Guard Ann, Expr Ann)] (Expr Ann)
go [A.MkUnguarded e]
= Right (exprToCoreFn ss [] Nothing e)
go gs
= Left [ (exprToCoreFn ss []Nothing cond, exprToCoreFn ss [] Nothing e)
| A.GuardedExpr g e <- gs
, let cond = guardToExpr g
]
guardToExpr [A.ConditionGuard cond] = cond
guardToExpr _ = internalError "Guard not correctly desugared"
binderToCoreFn :: SourceSpan -> [Comment] -> A.Binder -> Binder Ann
binderToCoreFn ss com (A.LiteralBinder lit) =
LiteralBinder (ss, com, Nothing, Nothing) (fmap (binderToCoreFn ss com) lit)
binderToCoreFn ss com A.NullBinder =
NullBinder (ss, com, Nothing, Nothing)
binderToCoreFn ss com (A.VarBinder name) =
VarBinder (ss, com, Nothing, Nothing) name
binderToCoreFn ss com (A.ConstructorBinder dctor@(Qualified mn' _) bs) =
let (_, tctor, _, _) = lookupConstructor env dctor
in ConstructorBinder (ss, com, Nothing, Just $ getConstructorMeta dctor) (Qualified mn' tctor) dctor (fmap (binderToCoreFn ss []) bs)
binderToCoreFn ss com (A.NamedBinder name b) =
NamedBinder (ss, com, Nothing, Nothing) name (binderToCoreFn ss [] b)
binderToCoreFn _ com (A.PositionedBinder ss com1 b) =
binderToCoreFn ss (com ++ com1) b
binderToCoreFn ss com (A.TypedBinder _ b) =
binderToCoreFn ss com b
binderToCoreFn _ _ A.OpBinder{} =
internalError "OpBinder should have been desugared before binderToCoreFn"
binderToCoreFn _ _ A.BinaryNoParensBinder{} =
internalError "BinaryNoParensBinder should have been desugared before binderToCoreFn"
binderToCoreFn _ _ A.ParensInBinder{} =
internalError "ParensInBinder should have been desugared before binderToCoreFn"
getValueMeta :: Qualified Ident -> Maybe Meta
getValueMeta name =
case lookupValue env name of
Just (_, External, _) -> Just IsForeign
_ -> Nothing
getConstructorMeta :: Qualified (ProperName 'ConstructorName) -> Meta
getConstructorMeta ctor =
case lookupConstructor env ctor of
(Newtype, _, _, _) -> IsNewtype
dc@(Data, _, _, fields) ->
let constructorType = if numConstructors (ctor, dc) == 1 then ProductType else SumType
in IsConstructor constructorType fields
where
numConstructors
:: (Qualified (ProperName 'ConstructorName), (DataDeclType, ProperName 'TypeName, Type, [Ident]))
-> Int
numConstructors ty = length $ filter (((==) `on` typeConstructor) ty) $ M.toList $ dataConstructors env
typeConstructor
:: (Qualified (ProperName 'ConstructorName), (DataDeclType, ProperName 'TypeName, Type, [Ident]))
-> (ModuleName, ProperName 'TypeName)
typeConstructor (Qualified (Just mn') _, (_, tyCtor, _, _)) = (mn', tyCtor)
typeConstructor _ = internalError "Invalid argument to typeConstructor"
findQualModules :: [A.Declaration] -> [ModuleName]
findQualModules decls =
let (f, _, _, _, _) = everythingOnValues (++) fqDecls fqValues fqBinders (const []) (const [])
in f `concatMap` decls
where
fqDecls :: A.Declaration -> [ModuleName]
fqDecls (A.TypeInstanceDeclaration _ _ _ q _ _) = getQual' q
fqDecls (A.ValueFixityDeclaration _ _ q _) = getQual' q
fqDecls (A.TypeFixityDeclaration _ _ q _) = getQual' q
fqDecls _ = []
fqValues :: A.Expr -> [ModuleName]
fqValues (A.Var q) = getQual' q
fqValues (A.Constructor q) = getQual' q
fqValues (A.TypeClassDictionaryConstructorApp c _) = getQual' c
fqValues _ = []
fqBinders :: A.Binder -> [ModuleName]
fqBinders (A.ConstructorBinder q _) = getQual' q
fqBinders _ = []
getQual' :: Qualified a -> [ModuleName]
getQual' = maybe [] return . getQual
importToCoreFn :: A.Declaration -> Maybe (Ann, ModuleName)
importToCoreFn (A.ImportDeclaration (ss, com) name _ _) = Just ((ss, com, Nothing, Nothing), name)
importToCoreFn _ = Nothing
externToCoreFn :: A.Declaration -> Maybe ForeignDecl
externToCoreFn (A.ExternDeclaration _ name ty) = Just (name, ty)
externToCoreFn _ = Nothing
exportToCoreFn :: A.DeclarationRef -> [Ident]
exportToCoreFn (A.TypeRef _ _ (Just dctors)) = fmap properToIdent dctors
exportToCoreFn (A.ValueRef _ name) = [name]
exportToCoreFn (A.TypeClassRef _ name) = [properToIdent name]
exportToCoreFn (A.TypeInstanceRef _ name) = [name]
exportToCoreFn _ = []
mkTypeClassConstructor :: SourceAnn -> [Constraint] -> [A.Declaration] -> Expr Ann
mkTypeClassConstructor (ss, com) [] [] = Literal (ss, com, Nothing, Just IsTypeClassConstructor) (ObjectLiteral [])
mkTypeClassConstructor (ss, com) supers members =
let args@(a:as) = sort $ fmap typeClassMemberName members ++ superClassDictionaryNames supers
props = [ (mkString arg, Var (ssAnn ss) $ Qualified Nothing (Ident arg)) | arg <- args ]
dict = Literal (ssAnn ss) (ObjectLiteral props)
in Abs (ss, com, Nothing, Just IsTypeClassConstructor)
(Ident a)
(foldr (Abs (ssAnn ss) . Ident) dict as)
properToIdent :: ProperName a -> Ident
properToIdent = Ident . runProperName