{- |

Module : $Header$

Description : print the abstract syntax so that it can be re-parsed

Copyright : (c) Christian Maeder and Uni Bremen 2003

License : similar to LGPL, see HetCATS/LICENSE.txt or LIZENZ.txt

Maintainer : Christian.Maeder@dfki.de

Stability : experimental

Portability : portable

printing data types of the abstract syntax

-}

module HasCASL.PrintAs where

import HasCASL.As

import HasCASL.AsUtils

import HasCASL.FoldTerm

import HasCASL.Builtin

import Common.Id

import Common.Keywords

import Common.DocUtils

import Common.Doc

import Common.AS_Annotation

import qualified Data.Set as Set

import Data.List (groupBy, mapAccumL)

-- | short cut for: if b then empty else d

noPrint :: Bool -> Doc -> Doc

noPrint b d = if b then empty else d

noNullPrint :: [a] -> Doc -> Doc

noNullPrint = noPrint . null

semiDs :: Pretty a => [a] -> Doc

semiDs = fsep . punctuate semi . map pretty

semiAnnoted :: Pretty a => [Annoted a] -> Doc

semiAnnoted = vcat . map (printSemiAnno pretty True)

instance Pretty Variance where

pretty = sidDoc . mkSimpleId . show

instance Pretty a => Pretty (AnyKind a) where

pretty knd = case knd of

ClassKind ci -> pretty ci

FunKind v k1 k2 _ -> fsep

[ pretty v <> (case k1 of

FunKind _ _ _ _ -> parens

_ -> id) (pretty k1)

, funArrow, pretty k2]

varOfTypeArg :: TypeArg -> Id

varOfTypeArg (TypeArg i _ _ _ _ _ _) = i

instance Pretty TypePattern where

pretty tp = case tp of

TypePattern name@(Id ts cs _) args _ ->

let ds = map (pretty . varOfTypeArg) args in

if placeCount name == length args then

let (ras, dts) = mapAccumL ( \ l t -> if isPlace t then

case l of

x : r -> (r, x)

_ -> error "Pretty TypePattern"

else (l, printTypeToken t)) ds ts

in fsep $ dts ++ (if null cs then [] else

[brackets $ sepByCommas $ map printTypeId cs])

++ ras

else printTypeId name <+> fsep ds

TypePatternToken t -> printTypeToken t

MixfixTypePattern ts -> fsep $ map pretty ts

BracketTypePattern k l _ -> bracket k $ ppWithCommas l

TypePatternArg t _ -> parens $ pretty t

-- | put proper brackets around a document

bracket :: BracketKind -> Doc -> Doc

bracket b = case b of

Parens -> parens

Squares -> brackets

Braces -> specBraces

NoBrackets -> id

-- | print a 'Kind' plus a preceding colon (or nothing)

printKind :: Kind -> Doc

printKind k = noPrint (k == universe) $ printVarKind NonVar (VarKind k)

-- | print the kind of a variable with its variance and a preceding colon

printVarKind :: Variance -> VarKind -> Doc

printVarKind e vk = case vk of

Downset t -> less <+> pretty t

VarKind k -> colon <+> pretty e <> pretty k

MissingKind -> empty

data TypePrec = Outfix | Prefix | Lazyfix | ProdInfix | FunInfix | Absfix

deriving (Eq, Ord)

parenPrec :: TypePrec -> (TypePrec, Doc) -> Doc

parenPrec p1 (p2, d) = if p2 < p1 then d else parens d

printTypeToken :: Token -> Doc

printTypeToken t = let

l = ("*", cross) : map ( \ (a, d) -> (show a, d) )

[ (FunArr, funArrow)

, (PFunArr, pfun)

, (ContFunArr, cfun)

, (PContFunArr, pcfun) ]

in case lookup (tokStr t) l of

Just d -> d

_ -> pretty t

printTypeId :: Id -> Doc

printTypeId (Id ts cs _) = let (toks, pls) = splitMixToken ts in

fcat $ map printTypeToken toks

++ (if null cs then [] else [brackets $ sepByCommas $ map printTypeId cs])

++ map printTypeToken pls

toMixType :: Type -> (TypePrec, Doc)

toMixType typ = case typ of

TypeName name _ _ -> (Outfix, printTypeId name)

TypeToken tt -> (Outfix, printTypeToken tt)

TypeAbs v t _ ->

(Absfix, sep [ lambda <+> pretty v, bullet <+> snd (toMixType t)])

ExpandedType t1 _ -> toMixType t1 -- here we print the unexpanded type

BracketType k l _ ->

(Outfix, bracket k $ sepByCommas $ map (snd . toMixType) l)

KindedType t kind _ -> (Lazyfix, sep

[ parenPrec Lazyfix $ toMixType t

, colon <+> printList0 (Set.toList kind)])

MixfixType ts -> (Prefix, fsep $ map (snd . toMixType) ts)

TypeAppl t1 t2 -> let

(topTy, tyArgs) = getTypeApplAux False typ

aArgs = (Prefix, sep [ parenPrec ProdInfix $ toMixType t1

, parenPrec Prefix $ toMixType t2 ])

in case topTy of

TypeName name@(Id ts cs _) _k _i ->

case map toMixType tyArgs of

[dArg] -> case ts of

[e] | name == lazyTypeId ->

(Lazyfix, pretty e <+> parenPrec Lazyfix dArg)

[e1, e2, e3] | not (isPlace e1) && isPlace e2

&& not (isPlace e3) && null cs ->

(Outfix, fsep [pretty e1, snd dArg, pretty e3])

_ -> aArgs

[dArg1, dArg2] -> case ts of

[_, e2, _] | isInfix name && null cs ->

if tokStr e2 == prodS then

(ProdInfix, fsep

[ parenPrec ProdInfix dArg1

, cross, parenPrec ProdInfix dArg2])

else -- assume fun type

(FunInfix, fsep

[ parenPrec FunInfix dArg1

, printTypeToken e2, snd dArg2])

_ -> aArgs

dArgs -> if isProductIdWithArgs name $ length tyArgs then

(ProdInfix, fsep $ punctuate (space <> cross) $

map (parenPrec ProdInfix) dArgs) else aArgs

_ -> aArgs

instance Pretty Type where

pretty = snd . toMixType

printTypeScheme :: PolyId -> TypeScheme -> Doc

printTypeScheme (PolyId _ tys _) (TypeScheme vs t _) =

let tdoc = pretty t in

if null vs || not (null tys) then tdoc else

fsep [forallDoc, semiDs vs, bullet <+> tdoc]

-- no curried notation for bound variables

instance Pretty TypeScheme where

pretty = printTypeScheme (PolyId applId [] nullRange)

instance Pretty Partiality where

pretty p = case p of

Partial -> quMarkD

Total -> empty

instance Pretty Quantifier where

pretty q = case q of

Universal -> forallDoc

Existential -> exists

Unique -> unique

instance Pretty TypeQual where

pretty q = case q of

OfType -> colon

AsType -> text asS

InType -> inDoc

Inferred -> colon

instance Pretty Term where

pretty = printTerm . rmSomeTypes

isSimpleTerm :: Term -> Bool

isSimpleTerm trm = case trm of

QualVar _ -> True

QualOp _ _ _ _ _ _ -> True

ResolvedMixTerm _ _ _ _ -> True

ApplTerm _ _ _ -> True

TupleTerm _ _ -> True

TermToken _ -> True

BracketTerm _ _ _ -> True

_ -> False

-- | used only to produce CASL applications

isSimpleArgTerm :: Term -> Bool

isSimpleArgTerm trm = case trm of

QualVar vd -> not (isPatVarDecl vd)

QualOp _ _ _ _ _ _ -> True

ResolvedMixTerm n _ l _ -> placeCount n /= 0 || not (null l)

TupleTerm _ _ -> True

BracketTerm _ _ _ -> True

_ -> False

hasRightQuant :: Term -> Bool

hasRightQuant t = case t of

QuantifiedTerm {} -> True

LambdaTerm {} -> True

CaseTerm {} -> True

LetTerm Let _ _ _ -> True

ResolvedMixTerm n _ ts _ | endPlace n && placeCount n == length ts

-> hasRightQuant (last ts)

ApplTerm (ResolvedMixTerm n _ [] _) t2 _ | endPlace n ->

case t2 of

TupleTerm ts _ | placeCount n == length ts -> hasRightQuant (last ts)

_ -> hasRightQuant t2

ApplTerm _ t2 _ -> hasRightQuant t2

_ -> False

zipArgs :: Id -> [Term] -> [Doc] -> [Doc]

zipArgs n ts ds = case (ts, ds) of

(t : r, d : s) -> let

p = parenTermDoc t d

e = if hasRightQuant t then parens d else p

in if null r && null s && endPlace n then

[if hasRightQuant t then d else p]

else e : zipArgs n r s

_ -> []

isPatVarDecl :: VarDecl -> Bool

isPatVarDecl (VarDecl v ty _ _) = case ty of

TypeName t _ _ -> isSimpleId v && take 2 (show t) == "_v"

_ -> False

parenTermDoc :: Term -> Doc -> Doc

parenTermDoc trm = if isSimpleTerm trm then id else parens

printTermRec :: FoldRec Doc (Doc, Doc)

printTermRec = FoldRec

{ foldQualVar = \ _ vd@(VarDecl v _ _ _) ->

if isPatVarDecl vd then pretty v

else parens $ keyword varS <+> pretty vd

, foldQualOp = \ _ br n t tys k _ ->

(if null tys || k == Infer then id else

(<> brackets (ppWithCommas tys))) $

parens $ fsep [pretty br, pretty n, colon, printTypeScheme n $

if isPred br then unPredTypeScheme t else t]

, foldResolvedMixTerm =

\ (ResolvedMixTerm _ _ os _) n@(Id toks cs ps) tys ts _ ->

let pn = placeCount n in if pn == length ts || null ts then

let ds = zipArgs n os ts in

if null tys then idApplDoc n ds

else let (ftoks, _) = splitMixToken toks

fId = Id ftoks cs ps

(fts, rts) = splitAt (placeCount fId) $ if null ts

then replicate pn $ pretty placeTok else ds

in fsep $ (idApplDoc fId fts <> brackets (ppWithCommas tys))

: rts

else idApplDoc applId [idDoc n, parens $ sepByCommas ts]

, foldApplTerm = \ (ApplTerm o1 o2 _) t1 t2 _ ->

case (o1, o2) of

-- comment out the following two guards for CASL applications

(ResolvedMixTerm n _ [] _, TupleTerm ts@(_ : _) _)

| placeCount n == length ts ->

idApplDoc n (zipArgs n ts $ map printTerm ts)

(ResolvedMixTerm n _ [] _, _) | placeCount n == 1

-> idApplDoc n $ zipArgs n [o2] [t2]

_ -> idApplDoc applId $ zipArgs applId [o1, o2] [t1, t2]

, foldTupleTerm = \ _ ts _ -> parens $ sepByCommas ts

, foldTypedTerm = \ (TypedTerm ot _ _ _) t q typ _ -> fsep [(case ot of

TypedTerm {} | elem q [Inferred, OfType] -> parens

ApplTerm (ResolvedMixTerm n _ [] _) arg _ ->

let pn = placeCount n in case arg of

TupleTerm ts@(_ : _) _ | pn == length ts -> parens

_ | pn == 1 || hasRightQuant ot -> parens

_ -> id

_ | hasRightQuant ot -> parens

_ -> id) t, pretty q, pretty typ]

, foldQuantifiedTerm = \ _ q vs t _ ->

fsep [pretty q, printGenVarDecls vs, bullet <+> t]

, foldLambdaTerm = \ (LambdaTerm ops _ _ _) ps q t _ ->

fsep [ lambda

, case ops of

[p] -> case p of

TupleTerm [] _ -> empty

QualVar vd@(VarDecl v ty _ _) ->

pretty v <+> if isPatVarDecl vd then empty

else printVarDeclType ty

_ -> head ps

_ -> if all ( \ p -> case p of

QualVar vd -> not $ isPatVarDecl vd

_ -> False) ops

then printGenVarDecls $ map

( \ (QualVar vd) -> GenVarDecl vd) ops

else fcat $ map parens ps

, (case q of

Partial -> bullet

Total -> bullet <> text exMark) <+> t]

, foldCaseTerm = \ _ t es _ ->

fsep [text caseS, t, text ofS,

cat $ punctuate (space <> bar <> space) $

map (printEq0 funArrow) es]

, foldLetTerm = \ _ br es t _ ->

let des = sep $ punctuate semi $ map (printEq0 equals) es

in case br of

Let -> fsep [sep [text letS <+> des, text inS], t]

Where -> fsep [sep [t, text whereS], des]

Program -> text programS <+> des

, foldTermToken = \ _ t -> pretty t

, foldMixTypeTerm = \ _ q t _ -> pretty q <+> pretty t

, foldMixfixTerm = \ _ ts -> fsep ts

, foldBracketTerm = \ _ k l _ -> bracket k $ sepByCommas l

, foldAsPattern = \ _ (VarDecl v _ _ _) p _ ->

fsep [pretty v, text asP, p]

, foldProgEq = \ _ p t _ -> (p, t) }

printTerm :: Term -> Doc

printTerm = foldTerm printTermRec

rmTypeRec :: MapRec

rmTypeRec = mapRec

{ foldQualOp = \ t _ (PolyId i _ _) _ tys k ps ->

if elem i $ map fst bList then ResolvedMixTerm i

(if k == Infer then [] else tys) [] ps else t

, foldTypedTerm = \ _ nt q ty ps -> case q of

Inferred -> nt

_ -> case nt of

TypedTerm _ oq oty _ | oty == ty || oq == InType -> nt

QualVar (VarDecl _ oty _ _) | oty == ty -> nt

_ -> TypedTerm nt q ty ps }

rmSomeTypes :: Term -> Term

rmSomeTypes = foldTerm rmTypeRec

-- | put parenthesis around applications

parenTermRec :: MapRec

parenTermRec = let

addParAppl t = case t of

ResolvedMixTerm _ _ [] _ -> t

QualVar _ -> t

QualOp _ _ _ _ _ _ -> t

TermToken _ -> t

BracketTerm _ _ _ -> t

TupleTerm _ _ -> t

_ -> TupleTerm [t] nullRange

in mapRec

{ foldApplTerm = \ _ t1 t2 ps ->

ApplTerm (addParAppl t1) (addParAppl t2) ps

, foldResolvedMixTerm = \ _ n tys ts ps ->

ResolvedMixTerm n tys (map addParAppl ts) ps

, foldTypedTerm = \ _ t q typ ps ->

TypedTerm (addParAppl t) q typ ps

, foldMixfixTerm = \ _ ts -> MixfixTerm $ map addParAppl ts

, foldAsPattern = \ _ v p ps -> AsPattern v (addParAppl p) ps

}

parenTerm :: Term -> Term

parenTerm = foldTerm parenTermRec

-- | print an equation with different symbols between pattern and term

printEq0 :: Doc -> (Doc, Doc) -> Doc

printEq0 s (p, t) = sep [p, hsep [s, t]]

printGenVarDecls :: [GenVarDecl] -> Doc

printGenVarDecls = fsep . punctuate semi . map

( \ l -> case l of

[x] -> pretty x

GenVarDecl (VarDecl _ t _ _) : _ -> sep

[ ppWithCommas (map ( \ (GenVarDecl (VarDecl v _ _ _)) -> v) l)

, printVarDeclType t]

GenTypeVarDecl (TypeArg _ e c _ _ _ _) : _ -> sep

[ ppWithCommas (map ( \ (GenTypeVarDecl v) -> varOfTypeArg v) l)

, printVarKind e c]

_ -> error "printGenVarDecls") . groupBy sameType

sameType :: GenVarDecl -> GenVarDecl -> Bool

sameType g1 g2 = case (g1, g2) of

(GenVarDecl (VarDecl _ t1 Comma _), GenVarDecl (VarDecl _ t2 _ _))

| t1 == t2 -> True

(GenTypeVarDecl (TypeArg _ e1 c1 _ _ Comma _),

GenTypeVarDecl (TypeArg _ e2 c2 _ _ _ _)) | e1 == e2 && c1 == c2 -> True

_ -> False

printVarDeclType :: Type -> Doc

printVarDeclType t = case t of

MixfixType [] -> empty

_ -> colon <+> pretty t

instance Pretty VarDecl where

pretty (VarDecl v t _ _) = pretty v <+> printVarDeclType t

instance Pretty GenVarDecl where

pretty gvd = case gvd of

GenVarDecl v -> pretty v

GenTypeVarDecl tv -> pretty tv

instance Pretty TypeArg where

pretty (TypeArg v e c _ _ _ _) =

pretty v <+> printVarKind e c

-- | don't print an empty list and put parens around longer lists

printList0 :: (Pretty a) => [a] -> Doc

printList0 l = case l of

[] -> empty

[x] -> pretty x

_ -> parens $ ppWithCommas l

instance Pretty BasicSpec where

pretty (BasicSpec l) = if null l then specBraces empty else

changeGlobalAnnos addBuiltins . vcat $ map pretty l

instance Pretty ProgEq where

pretty (ProgEq p t ps) = printEq0 equals $ foldEq printTermRec

$ ProgEq (rmSomeTypes p) (rmSomeTypes t) ps

instance Pretty BasicItem where

pretty bi = case bi of

SigItems s -> pretty s

ProgItems l _ -> noNullPrint l $ sep [keyword programS, semiAnnoted l]

ClassItems i l _ -> noNullPrint l $ let

b = semiAnnos pretty l

p = plClass l

in case i of

Plain -> topSigKey (classS ++ if p then "es" else "") <+> b

Instance -> sep [keyword classS <+>

keyword (instanceS ++ if p then sS else ""), b]

GenVarItems l _ -> topSigKey (varS ++ pluralS l) <+> printGenVarDecls l

FreeDatatype l _ -> sep

[ keyword freeS <+> keyword (typeS ++ pluralS l)

, semiAnnos pretty l]

GenItems l _ -> let gkw = keyword generatedS in

(if all (isDatatype . item) l then \ i -> gkw <+> rmTopKey i

else \ i -> sep [gkw, specBraces i])

$ vcat $ map (printAnnoted pretty) l

AxiomItems vs fs _ -> sep

[ if null vs then empty else forallDoc <+> printGenVarDecls vs

, case fs of

[] -> empty

_ -> let pp = addBullet . pretty in

vcat $ map (printAnnoted pp) (init fs)

++ [printSemiAnno pp True $ last fs]]

Internal l _ -> sep

[ keyword internalS

, specBraces $ vcat $ map (printAnnoted pretty) l]

plClass :: [Annoted ClassItem] -> Bool

plClass l = case map item l of

_ : _ : _ -> True

[ClassItem (ClassDecl (_ : _ : _) _ _) _ _] -> True

_ -> False

pluralS :: [a] -> String

pluralS l = case l of

_ : _ : _ -> sS

_ -> ""

isDatatype :: SigItems -> Bool

isDatatype si = case si of

TypeItems _ l _ -> all

((\ t -> case t of

Datatype _ -> True

_ -> False) . item) l

_ -> False

instance Pretty OpBrand where

pretty b = keyword $ show b

instance Pretty SigItems where

pretty si = case si of

TypeItems i l _ -> noNullPrint l $

let b = semiAnnos pretty l in case i of

Plain -> topSigKey ((if all (isSimpleTypeItem . item) l

then typeS else typeS) ++ plTypes l) <+> b

Instance ->

sep [keyword typeS <+> keyword (instanceS ++ plTypes l), b]

OpItems b l _ -> noNullPrint l $ topSigKey (show b ++ plOps l)

<+> let po = (prettyOpItem $ isPred b) in

if case item $ last l of

OpDecl _ _ a@(_ : _) _ -> case last a of

UnitOpAttr {} -> True

_ -> False

OpDefn {} -> True

_ -> False

then vcat (map (printSemiAnno po True) l)

else semiAnnos po l

plTypes :: [Annoted TypeItem] -> String

plTypes l = case map item l of

_ : _ : _ -> sS

[TypeDecl (_ : _ : _) _ _] -> sS

[SubtypeDecl (_ : _ : _) _ _] -> sS

[IsoDecl (_ : _ : _) _] -> sS

_ -> ""

plOps :: [Annoted OpItem] -> String

plOps l = case map item l of

_ : _ : _ -> sS

[OpDecl (_ : _ : _) _ _ _] -> sS

_ -> ""

isSimpleTypeItem :: TypeItem -> Bool

isSimpleTypeItem ti = case ti of

TypeDecl l k _ -> k == universe && all isSimpleTypePat l

SubtypeDecl l (TypeName i _ _) _ ->

not (isMixfix i) && all isSimpleTypePat l

SubtypeDefn p (Var _) t _ _ ->

isSimpleTypePat p && isSimpleType t

_ -> False

isSimpleTypePat :: TypePattern -> Bool

isSimpleTypePat tp = case tp of

TypePattern i [] _ -> not $ isMixfix i

_ -> False

isSimpleType :: Type -> Bool

isSimpleType t = case t of

TypeName i _ _ -> not $ isMixfix i

TypeToken _ -> True

MixfixType[TypeToken _, BracketType Squares (_ : _) _] -> True

_ -> False

instance Pretty ClassItem where

pretty (ClassItem d l _) = pretty d $+$ noNullPrint l

(specBraces $ vcat $ map (printAnnoted pretty) l)

instance Pretty ClassDecl where

pretty (ClassDecl l k _) = let cs = ppWithCommas l in

if k == universe then cs else fsep [cs, less, pretty k]

instance Pretty Vars where

pretty vd = case vd of

Var v -> pretty v

VarTuple vs _ -> parens $ ppWithCommas vs

instance Pretty TypeItem where

pretty ti = case ti of

TypeDecl l k _ -> sep [ppWithCommas l, printKind k]

SubtypeDecl l t _ ->

fsep [ppWithCommas l, less, pretty t]

IsoDecl l _ -> fsep $ punctuate (space <> equals) $ map pretty l

SubtypeDefn p v t f _ ->

fsep [pretty p, equals,

specBraces $ fsep

[pretty v, colon <+> pretty t, bullet <+> pretty f]]

AliasType p _ (TypeScheme l t _) _ ->

fsep $ pretty p : map (pretty . varOfTypeArg) l

++ [text assignS <+> pretty t]

Datatype t -> pretty t

printItScheme :: [PolyId] -> Bool -> TypeScheme -> Doc

printItScheme ps b = (case ps of

[p] -> printTypeScheme p

_ -> pretty) . (if b then unPredTypeScheme else id)

prettyOpItem :: Bool -> OpItem -> Doc

prettyOpItem b oi = case oi of

OpDecl l t a _ -> fsep $ punctuate comma (map pretty l)

++ [colon <+>

(if null a then id else (<> comma))(printItScheme l b t)]

++ punctuate comma (map pretty a)

OpDefn n ps s t _ -> fcat $

((if null ps then (<> space) else id) $ pretty n)

: map ((<> space) . parens . printGenVarDecls . map GenVarDecl) ps

++ (if b then [] else [colon <+> printItScheme [n] b s <> space])

++ [(if b then equiv else equals) <> space, pretty t]

instance Pretty PolyId where

pretty (PolyId i@(Id ts cs ps) tys _) = if null tys then pretty i else

let (fts, plcs) = splitMixToken ts

in idDoc (Id fts cs ps) <> brackets (ppWithCommas tys)

<> hcat (map pretty plcs)

instance Pretty BinOpAttr where

pretty a = text $ case a of

Assoc -> assocS

Comm -> commS

Idem -> idemS

instance Pretty OpAttr where

pretty oa = case oa of

BinOpAttr a _ -> pretty a

UnitOpAttr t _ -> text unitS <+> pretty t

instance Pretty DatatypeDecl where

pretty (DatatypeDecl p k alts d _) =

fsep [ pretty p, printKind k, defn

<+> cat (punctuate (space <> bar <> space)

$ map pretty alts)

, case d of

[] -> empty

_ -> keyword derivingS <+> ppWithCommas d]

instance Pretty Alternative where

pretty alt = case alt of

Constructor n cs p _ -> pretty n <+> fsep

(map ( \ l -> case (l, p) of

-- comment out the following line to output real CASL

([NoSelector (TypeToken t)], Total) | isSimpleId n -> pretty t

_ -> parens $ semiDs l) cs) <> pretty p

Subtype l _ -> text (if all isSimpleType l then typeS else typeS)

<+> ppWithCommas l

instance Pretty Component where

pretty sel = case sel of

Selector n _ t _ _ -> sep [pretty n, colon <+> pretty t]

NoSelector t -> pretty t

instance Pretty Symb where

pretty (Symb i mt _) =

sep $ pretty i : case mt of

Nothing -> []

Just (SymbType t) -> [colon <+> pretty t]

instance Pretty SymbItems where

pretty (SymbItems k syms _ _) =

printSK k syms <> ppWithCommas syms

instance Pretty SymbOrMap where

pretty (SymbOrMap s mt _) =

sep $ pretty s : case mt of

Nothing -> []

Just t -> [mapsto <+> pretty t]

instance Pretty SymbMapItems where

pretty (SymbMapItems k syms _ _) =

printSK k syms <> ppWithCommas syms

-- | print symbol kind

printSK :: SymbKind -> [a] -> Doc

printSK k l = case k of

Implicit -> empty

_ -> keyword (drop 3 (show k) ++ case l of

_ : _ : _ -> sS

_ -> "") <> space