@@ -1,1362 +0,0 @@
1−{-# LANGUAGE LambdaCase #-}
2−{-# LANGUAGE MultiWayIf #-}
3−{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE RecordWildCards #-}
5−{-# LANGUAGE TypeApplications #-}
6−
7−module Ormolu.Printer.Meat.Declaration.Value
8− ( p_valDecl,
9− p_pat,
10− p_hsExpr,
11− p_hsSplice,
12− p_stringLit,
13− )
14−where
15−
16−import Bag (bagToList)
17−import BasicTypes
18−import Control.Monad
19−import Ctype (is_space)
20−import Data.Bool (bool)
21−import Data.Char (isPunctuation, isSymbol)
22−import Data.Data hiding (Infix, Prefix)
23−import Data.Functor ((<&>))
24−import Data.List (intersperse, sortOn)
25−import Data.List.NonEmpty (NonEmpty (..), (<|))
26−import qualified Data.List.NonEmpty as NE
27−import Data.Text (Text)
28−import qualified Data.Text as Text
29−import GHC
30−import OccName (occNameString)
31−import Ormolu.Printer.Combinators
32−import Ormolu.Printer.Internal
33−import Ormolu.Printer.Meat.Common
34−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
35−import Ormolu.Printer.Meat.Declaration.Signature
36−import Ormolu.Printer.Meat.Type
37−import Ormolu.Printer.Operators
38−import Ormolu.Utils
39−
40−-- | Style of a group of equations.
41−data MatchGroupStyle
42− = Function (Located RdrName)
43− | PatternBind
44− | Case
45− | Lambda
46− | LambdaCase
47−
48−-- | Style of equations in a group.
49−data GroupStyle
50− = EqualSign
51− | RightArrow
52−
53−-- | Expression placement. This marks the places where expressions that
54−-- implement handing forms may use them.
55−data Placement
56− = -- | Multi-line layout should cause
57− -- insertion of a newline and indentation
58− -- bump
59− Normal
60− | -- | Expressions that have hanging form
61− -- should use it and avoid bumping one level
62− -- of indentation
63− Hanging
64− deriving (Eq, Show)
65−
66−p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
67−p_valDecl = \case
68− FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
69− PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
70− VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
71− AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
72− PatSynBind NoExtField psb -> p_patSynBind psb
73− XHsBindsLR x -> noExtCon x
74−
75−p_funBind ::
76− Located RdrName ->
77− MatchGroup GhcPs (LHsExpr GhcPs) ->
78− R ()
79−p_funBind name = p_matchGroup (Function name)
80−
81−p_matchGroup ::
82− MatchGroupStyle ->
83− MatchGroup GhcPs (LHsExpr GhcPs) ->
84− R ()
85−p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
86−
87−p_matchGroup' ::
88− Data body =>
89− -- | How to get body placement
90− (body -> Placement) ->
91− -- | How to print body
92− (body -> R ()) ->
93− -- | Style of this group of equations
94− MatchGroupStyle ->
95− -- | Match group
96− MatchGroup GhcPs (Located body) ->
97− R ()
98−p_matchGroup' placer render style MG {..} = do
99− let ob = case style of
100− Case -> id
101− LambdaCase -> id
102− _ -> dontUseBraces
103− -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
104− -- restore the brace state inside the sepsemi.
105− ub <- bool dontUseBraces useBraces <$> canUseBraces
106− ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
107− where
108− p_Match m@Match {..} =
109− p_match'
110− placer
111− render
112− (adjustMatchGroupStyle m style)
113− (isInfixMatch m)
114− (matchStrictness m)
115− m_pats
116− m_grhss
117− p_Match (XMatch x) = noExtCon x
118−p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
119−
120−-- | Function id obtained through pattern matching on 'FunBind' should not
121−-- be used to print the actual equations because the different ‘RdrNames’
122−-- used in the equations may have different “decorations” (such as backticks
123−-- and paretheses) associated with them. It is necessary to use per-equation
124−-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
125−-- name inside of 'Function' accordingly.
126−adjustMatchGroupStyle ::
127− Match GhcPs body ->
128− MatchGroupStyle ->
129− MatchGroupStyle
130−adjustMatchGroupStyle m = \case
131− Function _ -> (Function . mc_fun . m_ctxt) m
132− style -> style
133−
134−matchStrictness :: Match id body -> SrcStrictness
135−matchStrictness match =
136− case m_ctxt match of
137− FunRhs {mc_strictness = s} -> s
138− _ -> NoSrcStrict
139−
140−p_match ::
141− -- | Style of the group
142− MatchGroupStyle ->
143− -- | Is this an infix match?
144− Bool ->
145− -- | Strictness prefix (FunBind)
146− SrcStrictness ->
147− -- | Argument patterns
148− [LPat GhcPs] ->
149− -- | Equations
150− GRHSs GhcPs (LHsExpr GhcPs) ->
151− R ()
152−p_match = p_match' exprPlacement p_hsExpr
153−
154−p_match' ::
155− Data body =>
156− -- | How to get body placement
157− (body -> Placement) ->
158− -- | How to print body
159− (body -> R ()) ->
160− -- | Style of this group of equations
161− MatchGroupStyle ->
162− -- | Is this an infix match?
163− Bool ->
164− -- | Strictness prefix (FunBind)
165− SrcStrictness ->
166− -- | Argument patterns
167− [LPat GhcPs] ->
168− -- | Equations
169− GRHSs GhcPs (Located body) ->
170− R ()
171−p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
172− -- Normally, since patterns may be placed in a multi-line layout, it is
173− -- necessary to bump indentation for the pattern group so it's more
174− -- indented than function name. This in turn means that indentation for
175− -- the body should also be bumped. Normally this would mean that bodies
176− -- would start with two indentation steps applied, which is ugly, so we
177− -- need to be a bit more clever here and bump indentation level only when
178− -- pattern group is multiline.
179− case strictness of
180− NoSrcStrict -> return ()
181− SrcStrict -> txt "!"
182− SrcLazy -> txt "~"
183− indentBody <- case NE.nonEmpty m_pats of
184− Nothing ->
185− False <$ case style of
186− Function name -> p_rdrName name
187− _ -> return ()
188− Just ne_pats -> do
189− let combinedSpans = case style of
190− Function name -> combineSrcSpans (getLoc name) patSpans
191− _ -> patSpans
192− patSpans = combineSrcSpans' (getLoc <$> ne_pats)
193− indentBody = not (isOneLineSpan combinedSpans)
194− switchLayout [combinedSpans] $ do
195− let stdCase = sep breakpoint (located' p_pat) m_pats
196− case style of
197− Function name ->
198− p_infixDefHelper
199− isInfix
200− indentBody
201− (p_rdrName name)
202− (located' p_pat <$> m_pats)
203− PatternBind -> stdCase
204− Case -> stdCase
205− Lambda -> do
206− let needsSpace = case unLoc (NE.head ne_pats) of
207− LazyPat _ _ -> True
208− BangPat _ _ -> True
209− SplicePat _ _ -> True
210− _ -> False
211− txt "\\"
212− when needsSpace space
213− sitcc stdCase
214− LambdaCase -> stdCase
215− return indentBody
216− let -- Calculate position of end of patterns. This is useful when we decide
217− -- about putting certain constructions in hanging positions.
218− endOfPats = case NE.nonEmpty m_pats of
219− Nothing -> case style of
220− Function name -> Just (getLoc name)
221− _ -> Nothing
222− Just pats -> (Just . getLoc . NE.last) pats
223− isCase = \case
224− Case -> True
225− LambdaCase -> True
226− _ -> False
227− hasGuards = withGuards grhssGRHSs
228− grhssSpan =
229− combineSrcSpans' $
230− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
231− patGrhssSpan =
232− maybe
233− grhssSpan
234− (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
235− endOfPats
236− placement =
237− case endOfPats of
238− Nothing -> blockPlacement placer grhssGRHSs
239− Just spn ->
240− if onTheSameLine spn grhssSpan
241− then blockPlacement placer grhssGRHSs
242− else Normal
243− p_body = do
244− let groupStyle =
245− if isCase style && hasGuards
246− then RightArrow
247− else EqualSign
248− sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
249− p_where = do
250− let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
251− unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
252− breakpoint
253− txt "where"
254− unless whereIsEmpty breakpoint
255− inci $ located grhssLocalBinds p_hsLocalBinds
256− inciIf indentBody $ do
257− unless (length grhssGRHSs > 1) $
258− case style of
259− Function _ | hasGuards -> return ()
260− Function _ -> space >> inci equals
261− PatternBind -> space >> inci equals
262− s | isCase s && hasGuards -> return ()
263− _ -> space >> txt "->"
264− switchLayout [patGrhssSpan] $
265− placeHanging placement p_body
266− inci p_where
267−p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
268−
269−p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
270−p_grhs = p_grhs' exprPlacement p_hsExpr
271−
272−p_grhs' ::
273− Data body =>
274− -- | How to get body placement
275− (body -> Placement) ->
276− -- | How to print body
277− (body -> R ()) ->
278− GroupStyle ->
279− GRHS GhcPs (Located body) ->
280− R ()
281−p_grhs' placer render style (GRHS NoExtField guards body) =
282− case guards of
283− [] -> p_body
284− xs -> do
285− txt "|"
286− space
287− sitcc (sep commaDel (sitcc . located' p_stmt) xs)
288− space
289− inci $ case style of
290− EqualSign -> equals
291− RightArrow -> txt "->"
292− placeHanging placement p_body
293− where
294− placement =
295− case endOfGuards of
296− Nothing -> placer (unLoc body)
297− Just spn ->
298− if onTheSameLine spn (getLoc body)
299− then placer (unLoc body)
300− else Normal
301− endOfGuards =
302− case NE.nonEmpty guards of
303− Nothing -> Nothing
304− Just gs -> (Just . getLoc . NE.last) gs
305− p_body = located body render
306−p_grhs' _ _ _ (XGRHS x) = noExtCon x
307−
308−p_hsCmd :: HsCmd GhcPs -> R ()
309−p_hsCmd = \case
310− HsCmdArrApp NoExtField body input arrType _ -> do
311− located body p_hsExpr
312− breakpoint
313− inci $ do
314− case arrType of
315− HsFirstOrderApp -> txt "-<"
316− HsHigherOrderApp -> txt "-<<"
317− placeHanging (exprPlacement (unLoc input)) $
318− located input p_hsExpr
319− HsCmdArrForm NoExtField form Prefix _ cmds -> banana $ do
320− located form p_hsExpr
321− unless (null cmds) $ do
322− breakpoint
323− inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
324− HsCmdArrForm NoExtField form Infix _ [left, right] -> do
325− located left p_hsCmdTop
326− space
327− located form p_hsExpr
328− placeHanging (cmdTopPlacement (unLoc right)) $
329− located right p_hsCmdTop
330− HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
331− HsCmdApp {} ->
332− -- XXX Does this ever occur in the syntax tree? It does not seem like it
333− -- does. Open an issue and ping @yumiova if this ever occurs in output.
334− notImplemented "HsCmdApp"
335− HsCmdLam NoExtField mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
336− HsCmdPar NoExtField c -> parens N (located c p_hsCmd)
337− HsCmdCase NoExtField e mgroup ->
338− p_case cmdPlacement p_hsCmd e mgroup
339− HsCmdIf NoExtField _ if' then' else' ->
340− p_if cmdPlacement p_hsCmd if' then' else'
341− HsCmdLet NoExtField localBinds c ->
342− p_let p_hsCmd localBinds c
343− HsCmdDo NoExtField es -> do
344− txt "do"
345− newline
346− inci . located es $
347− sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
348− HsCmdWrap {} -> notImplemented "HsCmdWrap"
349− XCmd x -> noExtCon x
350−
351−p_hsCmdTop :: HsCmdTop GhcPs -> R ()
352−p_hsCmdTop = \case
353− HsCmdTop NoExtField cmd -> located cmd p_hsCmd
354− XCmdTop x -> noExtCon x
355−
356−-- | Render an expression preserving blank lines between such consecutive
357−-- expressions found in the original source code.
358−withSpacing ::
359− -- | Rendering function
360− (a -> R ()) ->
361− -- | Entity to render
362− Located a ->
363− R ()
364−withSpacing f l = located l $ \x -> do
365− case getLoc l of
366− UnhelpfulSpan _ -> f x
367− RealSrcSpan currentSpn -> do
368− getSpanMark >>= \case
369− -- Spacing before comments will be handled by the code
370− -- that prints comments, so we just have to deal with
371− -- blank lines between statements here.
372− Just (StatementSpan lastSpn) ->
373− if srcSpanStartLine currentSpn > srcSpanEndLine lastSpn + 1
374− then newline
375− else return ()
376− _ -> return ()
377− f x
378− -- In some cases the (f x) expression may insert a new mark. We want
379− -- to be careful not to override comment marks.
380− getSpanMark >>= \case
381− Just (HaddockSpan _ _) -> return ()
382− Just (CommentSpan _) -> return ()
383− _ -> setSpanMark (StatementSpan currentSpn)
384−
385−p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
386−p_stmt = p_stmt' exprPlacement p_hsExpr
387−
388−p_stmt' ::
389− Data body =>
390− -- | Placer
391− (body -> Placement) ->
392− -- | Render
393− (body -> R ()) ->
394− -- | Statement to render
395− Stmt GhcPs (Located body) ->
396− R ()
397−p_stmt' placer render = \case
398− LastStmt NoExtField body _ _ -> located body render
399− BindStmt NoExtField p f _ _ -> do
400− located p p_pat
401− space
402− txt "<-"
403− let loc = getLoc p
404− placement =
405− case f of
406− L l' x ->
407− if isOneLineSpan
408− (mkSrcSpan (srcSpanEnd loc) (srcSpanStart l'))
409− then placer x
410− else Normal
411− switchLayout [loc, getLoc f] $
412− placeHanging placement (located f render)
413− ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
414− BodyStmt NoExtField body _ _ -> located body render
415− LetStmt NoExtField binds -> do
416− txt "let"
417− space
418− sitcc $ located binds p_hsLocalBinds
419− ParStmt {} ->
420− -- 'ParStmt' should always be eliminated in 'gatherStmt' already, such
421− -- that it never occurs in 'p_stmt''. Consequently, handling it here
422− -- would be redundant.
423− notImplemented "ParStmt"
424− TransStmt {..} ->
425− -- 'TransStmt' only needs to account for render printing itself, since
426− -- pretty printing of relevant statements (e.g., in 'trS_stmts') is
427− -- handled through 'gatherStmt'.
428− case (trS_form, trS_by) of
429− (ThenForm, Nothing) -> do
430− txt "then"
431− breakpoint
432− inci $ located trS_using p_hsExpr
433− (ThenForm, Just e) -> do
434− txt "then"
435− breakpoint
436− inci $ located trS_using p_hsExpr
437− breakpoint
438− txt "by"
439− breakpoint
440− inci $ located e p_hsExpr
441− (GroupForm, Nothing) -> do
442− txt "then group using"
443− breakpoint
444− inci $ located trS_using p_hsExpr
445− (GroupForm, Just e) -> do
446− txt "then group by"
447− breakpoint
448− inci $ located e p_hsExpr
449− breakpoint
450− txt "using"
451− breakpoint
452− inci $ located trS_using p_hsExpr
453− RecStmt {..} -> do
454− txt "rec"
455− space
456− sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457− XStmtLR c -> noExtCon c
458−
459−gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
460−gatherStmt (L _ (ParStmt NoExtField block _ _)) =
461− foldr ((<>) . gatherStmtBlock) [] block
462−gatherStmt (L s stmt@TransStmt {..}) =
463− foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
464−gatherStmt stmt = [[stmt]]
465−
466−gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
467−gatherStmtBlock (ParStmtBlock _ stmts _ _) =
468− foldr (liftAppend . gatherStmt) [] stmts
469−gatherStmtBlock (XParStmtBlock x) = noExtCon x
470−
471−p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
472−p_hsLocalBinds = \case
473− HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
474− -- When in a single-line layout, there is a chance that the inner
475− -- elements will also contain semicolons and they will confuse the
476− -- parser. so we request braces around every element except the last.
477− br <- layoutToBraces <$> getLayout
478− let items =
479− let injectLeft (L l x) = L l (Left x)
480− injectRight (L l x) = L l (Right x)
481− in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
482− positionToBracing = \case
483− SinglePos -> id
484− FirstPos -> br
485− MiddlePos -> br
486− LastPos -> id
487− p_item' (p, item) =
488− positionToBracing p $
489− withSpacing (either p_valDecl p_sigDecl) item
490− binds = sortOn (srcSpanStart . getLoc) items
491− sitcc $ sepSemi p_item' (attachRelativePos binds)
492− HsValBinds NoExtField _ -> notImplemented "HsValBinds"
493− HsIPBinds NoExtField (IPBinds NoExtField xs) ->
494− -- Second argument of IPBind is always Left before type-checking.
495− let p_ipBind (IPBind NoExtField (Left name) expr) = do
496− atom name
497− space
498− equals
499− breakpoint
500− useBraces $ inci $ located expr p_hsExpr
501− p_ipBind (IPBind NoExtField (Right _) _) =
502− -- Should only occur after the type checker
503− notImplemented "IPBind _ (Right _) _"
504− p_ipBind (XIPBind x) = noExtCon x
505− in sepSemi (located' p_ipBind) xs
506− HsIPBinds NoExtField _ -> notImplemented "HsIpBinds"
507− EmptyLocalBinds NoExtField -> return ()
508− XHsLocalBindsLR x -> noExtCon x
509−
510−p_hsRecField ::
511− HsRecField' RdrName (LHsExpr GhcPs) ->
512− R ()
513−p_hsRecField HsRecField {..} = do
514− p_rdrName hsRecFieldLbl
515− unless hsRecPun $ do
516− space
517− equals
518− let placement =
519− if onTheSameLine (getLoc hsRecFieldLbl) (getLoc hsRecFieldArg)
520− then exprPlacement (unLoc hsRecFieldArg)
521− else Normal
522− placeHanging placement (located hsRecFieldArg p_hsExpr)
523−
524−p_hsExpr :: HsExpr GhcPs -> R ()
525−p_hsExpr = p_hsExpr' N
526−
527−p_hsExpr' :: BracketStyle -> HsExpr GhcPs -> R ()
528−p_hsExpr' s = \case
529− HsVar NoExtField name -> p_rdrName name
530− HsUnboundVar NoExtField v -> atom (unboundVarOcc v)
531− HsConLikeOut NoExtField _ -> notImplemented "HsConLikeOut"
532− HsRecFld NoExtField x ->
533− case x of
534− Unambiguous NoExtField name -> p_rdrName name
535− Ambiguous NoExtField name -> p_rdrName name
536− XAmbiguousFieldOcc xx -> noExtCon xx
537− HsOverLabel NoExtField _ v -> do
538− txt "#"
539− atom v
540− HsIPVar NoExtField (HsIPName name) -> do
541− txt "?"
542− atom name
543− HsOverLit NoExtField v -> atom (ol_val v)
544− HsLit NoExtField lit ->
545− case lit of
546− HsString (SourceText stxt) _ -> p_stringLit stxt
547− HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
548− r -> atom r
549− HsLam NoExtField mgroup ->
550− p_matchGroup Lambda mgroup
551− HsLamCase NoExtField mgroup -> do
552− txt "\\case"
553− breakpoint
554− inci (p_matchGroup LambdaCase mgroup)
555− HsApp NoExtField f x -> do
556− let -- In order to format function applications with multiple parameters
557− -- nicer, traverse the AST to gather the function and all the
558− -- parameters together.
559− gatherArgs f' knownArgs =
560− case f' of
561− L _ (HsApp _ l r) -> gatherArgs l (r <| knownArgs)
562− _ -> (f', knownArgs)
563− (func, args) = gatherArgs f (x :| [])
564− -- We need to handle the last argument specially if it is a
565− -- hanging construct, so separate it from the rest.
566− (initp, lastp) = (NE.init args, NE.last args)
567− initSpan =
568− combineSrcSpans' $
569− getLoc f :| [(srcLocSpan . srcSpanStart . getLoc) lastp]
570− -- Hang the last argument only if the initial arguments span one
571− -- line.
572− placement =
573− if isOneLineSpan initSpan
574− then exprPlacement (unLoc lastp)
575− else Normal
576− -- If the last argument is not hanging, just separate every argument as
577− -- usual. If it is hanging, print the initial arguments and hang the
578− -- last one. Also, use braces around the every argument except the last
579− -- one.
580− case placement of
581− Normal -> do
582− let -- Usually we want to bump indentation for arguments for the
583− -- sake of readability. However, when the function itself is a
584− -- do-block or case expression it is not a good idea. It seems
585− -- to be safe to always bump indentation when the function
586− -- expression is parenthesised.
587− doIndent =
588− case func of
589− L _ (HsPar NoExtField _) -> True
590− L _ (HsAppType NoExtField _ _) -> True
591− L _ (HsMultiIf NoExtField _) -> True
592− L spn _ -> isOneLineSpan spn
593− ub <-
594− getLayout <&> \case
595− SingleLine -> useBraces
596− MultiLine -> id
597− ub $ do
598− located func (p_hsExpr' s)
599− breakpoint
600− inciIf doIndent $ sep breakpoint (located' p_hsExpr) initp
601− inciIf doIndent $ do
602− unless (null initp) breakpoint
603− located lastp p_hsExpr
604− Hanging -> do
605− useBraces . switchLayout [initSpan] $ do
606− located func (p_hsExpr' s)
607− breakpoint
608− sep breakpoint (located' p_hsExpr) initp
609− placeHanging placement $
610− located lastp p_hsExpr
611− HsAppType NoExtField e a -> do
612− located e p_hsExpr
613− breakpoint
614− inci $ do
615− txt "@"
616− -- Insert a space when the type is represented as a TH splice to avoid
617− -- gluing @ and $ together.
618− case unLoc (hswc_body a) of
619− HsSpliceTy {} -> space
620− _ -> return ()
621− located (hswc_body a) p_hsType
622− OpApp NoExtField x op y -> do
623− let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
624− p_exprOpTree s (reassociateOpTree getOpName opTree)
625− NegApp NoExtField e _ -> do
626− txt "-"
627− space
628− located e p_hsExpr
629− HsPar NoExtField e ->
630− parens s (located e (dontUseBraces . p_hsExpr))
631− SectionL NoExtField x op -> do
632− located x p_hsExpr
633− breakpoint
634− inci (located op p_hsExpr)
635− SectionR NoExtField op x -> do
636− located op p_hsExpr
637− useRecordDot' <- useRecordDot
638− let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639− unless (useRecordDot' && isRecordDot') breakpoint
640− inci (located x p_hsExpr)
641− ExplicitTuple NoExtField args boxity ->
642− let isSection = any (isMissing . unLoc) args
643− isMissing = \case
644− Missing NoExtField -> True
645− _ -> False
646− p_arg = \case
647− Present NoExtField x -> located x p_hsExpr
648− Missing NoExtField -> pure ()
649− XTupArg x -> noExtCon x
650− p_larg = sitcc . located' p_arg
651− parens' =
652− case boxity of
653− Boxed -> parens
654− Unboxed -> parensHash
655− in if isSection
656− then
657− switchLayout [] . parens' s $
658− sep comma p_larg args
659− else
660− switchLayout (getLoc <$> args) . parens' s $
661− sep commaDel p_larg args
662− ExplicitSum NoExtField tag arity e ->
663− p_unboxedSum N tag arity (located e p_hsExpr)
664− HsCase NoExtField e mgroup ->
665− p_case exprPlacement p_hsExpr e mgroup
666− HsIf NoExtField _ if' then' else' ->
667− p_if exprPlacement p_hsExpr if' then' else'
668− HsMultiIf NoExtField guards -> do
669− txt "if"
670− breakpoint
671− inci . inci $ sep newline (located' (p_grhs RightArrow)) guards
672− HsLet NoExtField localBinds e ->
673− p_let p_hsExpr localBinds e
674− HsDo NoExtField ctx es -> do
675− let doBody header = do
676− txt header
677− breakpoint
678− ub <- layoutToBraces <$> getLayout
679− inci $
680− sepSemi
681− (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
682− (unLoc es)
683− compBody = brackets N . located es $ \xs -> do
684− let p_parBody =
685− sep
686− (breakpoint >> txt "|" >> space)
687− p_seqBody
688− p_seqBody =
689− sitcc
690− . sep
691− commaDel
692− (located' (sitcc . p_stmt))
693− stmts = init xs
694− yield = last xs
695− lists = foldr (liftAppend . gatherStmt) [] stmts
696− located yield p_stmt
697− breakpoint
698− txt "|"
699− space
700− p_parBody lists
701− case ctx of
702− DoExpr -> doBody "do"
703− MDoExpr -> doBody "mdo"
704− ListComp -> compBody
705− MonadComp -> notImplemented "MonadComp"
706− ArrowExpr -> notImplemented "ArrowExpr"
707− GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
708− PatGuard _ -> notImplemented "PatGuard"
709− ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
710− TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
711− ExplicitList _ _ xs ->
712− brackets s $
713− sep commaDel (sitcc . located' p_hsExpr) xs
714− RecordCon {..} -> do
715− located rcon_con_name atom
716− breakpoint
717− let HsRecFields {..} = rcon_flds
718− updName f =
719− (f :: HsRecField GhcPs (LHsExpr GhcPs))
720− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
721− FieldOcc _ n -> n
722− XFieldOcc x -> noExtCon x
723− }
724− fields = located' (p_hsRecField . updName) <$> rec_flds
725− dotdot =
726− case rec_dotdot of
727− Just {} -> [txt ".."]
728− Nothing -> []
729− inci . braces N $
730− sep commaDel sitcc (fields <> dotdot)
731− RecordUpd {..} -> do
732− located rupd_expr p_hsExpr
733− useRecordDot' <- useRecordDot
734− let mrs sp = case getLoc sp of
735− RealSrcSpan r -> Just r
736− _ -> Nothing
737− let isPluginForm =
738− ((1 +) . srcSpanEndCol <$> mrs rupd_expr)
739− == (srcSpanStartCol <$> mrs (head rupd_flds))
740− unless (useRecordDot' && isPluginForm) breakpoint
741− let updName f =
742− (f :: HsRecUpdField GhcPs)
743− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
744− Ambiguous _ n -> n
745− Unambiguous _ n -> n
746− XAmbiguousFieldOcc x -> noExtCon x
747− }
748− inci . braces N $
749− sep
750− commaDel
751− (sitcc . located' (p_hsRecField . updName))
752− rupd_flds
753− ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
754− located x p_hsExpr
755− space
756− txt "::"
757− breakpoint
758− inci $ located hsib_body p_hsType
759− ExprWithTySig NoExtField _ HsWC {hswc_body = XHsImplicitBndrs x} -> noExtCon x
760− ExprWithTySig NoExtField _ (XHsWildCardBndrs x) -> noExtCon x
761− ArithSeq NoExtField _ x ->
762− case x of
763− From from -> brackets s $ do
764− located from p_hsExpr
765− breakpoint
766− txt ".."
767− FromThen from next -> brackets s $ do
768− sep commaDel (located' p_hsExpr) [from, next]
769− breakpoint
770− txt ".."
771− FromTo from to -> brackets s $ do
772− located from p_hsExpr
773− breakpoint
774− txt ".."
775− space
776− located to p_hsExpr
777− FromThenTo from next to -> brackets s $ do
778− sep commaDel (located' p_hsExpr) [from, next]
779− breakpoint
780− txt ".."
781− space
782− located to p_hsExpr
783− HsSCC NoExtField _ name x -> do
784− txt "{-# SCC "
785− atom name
786− txt " #-}"
787− breakpoint
788− located x p_hsExpr
789− HsCoreAnn NoExtField _ value x -> do
790− txt "{-# CORE "
791− atom value
792− txt " #-}"
793− breakpoint
794− located x p_hsExpr
795− HsBracket NoExtField x -> p_hsBracket x
796− HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
797− HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
798− HsSpliceE NoExtField splice -> p_hsSplice splice
799− HsProc NoExtField p e -> do
800− txt "proc"
801− located p $ \x -> do
802− breakpoint
803− inci (p_pat x)
804− breakpoint
805− txt "->"
806− placeHanging (cmdTopPlacement (unLoc e)) $
807− located e p_hsCmdTop
808− HsStatic _ e -> do
809− txt "static"
810− breakpoint
811− inci (located e p_hsExpr)
812− HsTick {} -> notImplemented "HsTick"
813− HsBinTick {} -> notImplemented "HsBinTick"
814− HsTickPragma {} -> notImplemented "HsTickPragma"
815− HsWrap {} -> notImplemented "HsWrap"
816− XExpr x -> noExtCon x
817−
818−p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
819−p_patSynBind PSB {..} = do
820− let rhs = do
821− space
822− case psb_dir of
823− Unidirectional -> do
824− txt "<-"
825− breakpoint
826− located psb_def p_pat
827− ImplicitBidirectional -> do
828− equals
829− breakpoint
830− located psb_def p_pat
831− ExplicitBidirectional mgroup -> do
832− txt "<-"
833− breakpoint
834− located psb_def p_pat
835− newline
836− txt "where"
837− newline
838− inci (p_matchGroup (Function psb_id) mgroup)
839− txt "pattern"
840− case psb_args of
841− PrefixCon xs -> do
842− space
843− p_rdrName psb_id
844− inci $ do
845− switchLayout (getLoc <$> xs) $ do
846− unless (null xs) breakpoint
847− sitcc (sep breakpoint p_rdrName xs)
848− rhs
849− RecCon xs -> do
850− space
851− p_rdrName psb_id
852− inci $ do
853− switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
854− unless (null xs) breakpoint
855− braces N $
856− sep commaDel (p_rdrName . recordPatSynPatVar) xs
857− rhs
858− InfixCon l r -> do
859− switchLayout [getLoc l, getLoc r] $ do
860− space
861− p_rdrName l
862− breakpoint
863− inci $ do
864− p_rdrName psb_id
865− space
866− p_rdrName r
867− inci rhs
868−p_patSynBind (XPatSynBind x) = noExtCon x
869−
870−p_case ::
871− Data body =>
872− -- | Placer
873− (body -> Placement) ->
874− -- | Render
875− (body -> R ()) ->
876− -- | Expression
877− LHsExpr GhcPs ->
878− -- | Match group
879− MatchGroup GhcPs (Located body) ->
880− R ()
881−p_case placer render e mgroup = do
882− txt "case"
883− space
884− located e p_hsExpr
885− space
886− txt "of"
887− breakpoint
888− inci (p_matchGroup' placer render Case mgroup)
889−
890−p_if ::
891− Data body =>
892− -- | Placer
893− (body -> Placement) ->
894− -- | Render
895− (body -> R ()) ->
896− -- | If
897− LHsExpr GhcPs ->
898− -- | Then
899− Located body ->
900− -- | Else
901− Located body ->
902− R ()
903−p_if placer render if' then' else' = do
904− txt "if"
905− space
906− located if' p_hsExpr
907− breakpoint
908− inci $ do
909− txt "then"
910− space
911− located then' $ \x ->
912− placeHanging (placer x) (render x)
913− breakpoint
914− txt "else"
915− space
916− located else' $ \x ->
917− placeHanging (placer x) (render x)
918−
919−p_let ::
920− Data body =>
921− -- | Render
922− (body -> R ()) ->
923− Located (HsLocalBindsLR GhcPs GhcPs) ->
924− Located body ->
925− R ()
926−p_let render localBinds e = sitcc $ do
927− txt "let"
928− space
929− dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
930− vlayout space (newline >> txt " ")
931− txt "in"
932− space
933− sitcc (located e render)
934−
935−p_pat :: Pat GhcPs -> R ()
936−p_pat = \case
937− WildPat NoExtField -> txt "_"
938− VarPat NoExtField name -> p_rdrName name
939− LazyPat NoExtField pat -> do
940− txt "~"
941− located pat p_pat
942− AsPat NoExtField name pat -> do
943− p_rdrName name
944− txt "@"
945− located pat p_pat
946− ParPat NoExtField pat ->
947− located pat (parens S . p_pat)
948− BangPat NoExtField pat -> do
949− txt "!"
950− located pat p_pat
951− ListPat NoExtField pats ->
952− brackets S $ sep commaDel (located' p_pat) pats
953− TuplePat NoExtField pats boxing -> do
954− let parens' =
955− case boxing of
956− Boxed -> parens S
957− Unboxed -> parensHash S
958− parens' $ sep commaDel (sitcc . located' p_pat) pats
959− SumPat NoExtField pat tag arity ->
960− p_unboxedSum S tag arity (located pat p_pat)
961− ConPatIn pat details ->
962− case details of
963− PrefixCon xs -> sitcc $ do
964− p_rdrName pat
965− unless (null xs) $ do
966− breakpoint
967− inci . sitcc $ sep breakpoint (sitcc . located' p_pat) xs
968− RecCon (HsRecFields fields dotdot) -> do
969− p_rdrName pat
970− breakpoint
971− let f = \case
972− Nothing -> txt ".."
973− Just x -> located x p_pat_hsRecField
974− inci . braces N . sep commaDel f $
975− case dotdot of
976− Nothing -> Just <$> fields
977− Just (L _ n) -> (Just <$> take n fields) ++ [Nothing]
978− InfixCon l r -> do
979− switchLayout [getLoc l, getLoc r] $ do
980− located l p_pat
981− breakpoint
982− inci $ do
983− p_rdrName pat
984− space
985− located r p_pat
986− ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
987− ViewPat NoExtField expr pat -> sitcc $ do
988− located expr p_hsExpr
989− space
990− txt "->"
991− breakpoint
992− inci (located pat p_pat)
993− SplicePat NoExtField splice -> p_hsSplice splice
994− LitPat NoExtField p -> atom p
995− NPat NoExtField v _ _ -> located v (atom . ol_val)
996− NPlusKPat NoExtField n k _ _ _ -> sitcc $ do
997− p_rdrName n
998− breakpoint
999− inci $ do
1000− txt "+"
1001− space
1002− located k (atom . ol_val)
1003− SigPat NoExtField pat hswc -> do
1004− located pat p_pat
1005− p_typeAscription hswc
1006− CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
1007− XPat x -> noExtCon x
1008−
1009−p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1010−p_pat_hsRecField HsRecField {..} = do
1011− located hsRecFieldLbl $ \x ->
1012− p_rdrName (rdrNameFieldOcc x)
1013− unless hsRecPun $ do
1014− space
1015− equals
1016− breakpoint
1017− inci (located hsRecFieldArg p_pat)
1018−
1019−p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
1020−p_unboxedSum s tag arity m = do
1021− let before = tag - 1
1022− after = arity - before - 1
1023− args = replicate before Nothing <> [Just m] <> replicate after Nothing
1024− f x =
1025− case x :: Maybe (R ()) of
1026− Nothing ->
1027− space
1028− Just m' -> do
1029− space
1030− m'
1031− space
1032− parensHash s $ sep (txt "|") f args
1033−
1034−p_hsSplice :: HsSplice GhcPs -> R ()
1035−p_hsSplice = \case
1036− HsTypedSplice NoExtField deco _ expr -> p_hsSpliceTH True expr deco
1037− HsUntypedSplice NoExtField deco _ expr -> p_hsSpliceTH False expr deco
1038− HsQuasiQuote NoExtField _ quoterName srcSpan str -> do
1039− txt "["
1040− p_rdrName (L srcSpan quoterName)
1041− txt "|"
1042− -- QuasiQuoters often rely on precise custom strings. We cannot do any
1043− -- formatting here without potentially breaking someone's code.
1044− atom str
1045− txt "|]"
1046− HsSpliced {} -> notImplemented "HsSpliced"
1047− HsSplicedT {} -> notImplemented "HsSplicedT"
1048− XSplice x -> noExtCon x
1049−
1050−p_hsSpliceTH ::
1051− -- | Typed splice?
1052− Bool ->
1053− -- | Splice expression
1054− LHsExpr GhcPs ->
1055− -- | Splice decoration
1056− SpliceDecoration ->
1057− R ()
1058−p_hsSpliceTH isTyped expr = \case
1059− HasParens -> do
1060− txt decoSymbol
1061− parens N (located expr (sitcc . p_hsExpr))
1062− HasDollar -> do
1063− txt decoSymbol
1064− located expr (sitcc . p_hsExpr)
1065− NoParens ->
1066− located expr (sitcc . p_hsExpr)
1067− where
1068− decoSymbol = if isTyped then "$$" else "$"
1069−
1070−p_hsBracket :: HsBracket GhcPs -> R ()
1071−p_hsBracket = \case
1072− ExpBr NoExtField expr -> do
1073− anns <- getEnclosingAnns
1074− let name = case anns of
1075− AnnOpenEQ : _ -> ""
1076− _ -> "e"
1077− quote name (located expr p_hsExpr)
1078− PatBr NoExtField pat -> located pat (quote "p" . p_pat)
1079− DecBrL NoExtField decls -> quote "d" (p_hsDecls Free decls)
1080− DecBrG NoExtField _ -> notImplemented "DecBrG" -- result of renamer
1081− TypBr NoExtField ty -> quote "t" (located ty p_hsType)
1082− VarBr NoExtField isSingleQuote name -> do
1083− txt (bool "''" "'" isSingleQuote)
1084− -- HACK As you can see we use 'noLoc' here to be able to pass name into
1085− -- 'p_rdrName' since the latter expects a "located" thing. The problem
1086− -- is that 'VarBr' doesn't provide us with location of the name. This in
1087− -- turn makes it impossible to detect if there are parentheses around
1088− -- it, etc. So we have to add parentheses manually assuming they are
1089− -- necessary for all operators.
1090− let isOperator =
1091− all
1092− (\i -> isPunctuation i || isSymbol i)
1093− (showOutputable (rdrNameOcc name))
1094− && not (doesNotNeedExtraParens name)
1095− wrapper = if isOperator then parens N else id
1096− wrapper $ p_rdrName (noLoc name)
1097− TExpBr NoExtField expr -> do
1098− txt "[||"
1099− breakpoint'
1100− located expr p_hsExpr
1101− breakpoint'
1102− txt "||]"
1103− XBracket x -> noExtCon x
1104− where
1105− quote :: Text -> R () -> R ()
1106− quote name body = do
1107− txt "["
1108− txt name
1109− txt "|"
1110− breakpoint'
1111− inci $ do
1112− dontUseBraces body
1113− breakpoint'
1114− txt "|]"
1115−
1116−-- Print the source text of a string literal while indenting
1117−-- gaps correctly.
1118−
1119−p_stringLit :: String -> R ()
1120−p_stringLit src =
1121− let s = splitGaps src
1122− singleLine =
1123− txt $ Text.pack (mconcat s)
1124− multiLine =
1125− sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126− in vlayout singleLine multiLine
1127− where
1128− -- Split a string on gaps (backslash delimited whitespaces)
1129− --
1130− -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131− splitGaps :: String -> [String]
1132− splitGaps "" = []
1133− splitGaps s =
1134− let -- A backslash and a whitespace starts a "gap"
1135− p (Just '\\', _, _) = True
1136− p (_, '\\', Just c) | ghcSpace c = False
1137− p _ = True
1138− in case span p (zipPrevNext s) of
1139− (l, r) ->
1140− let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141− r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142− in map orig l : splitGaps r'
1143− -- GHC's definition of whitespaces in strings
1144− -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145− ghcSpace :: Char -> Bool
1146− ghcSpace c = c <= '\x7f' && is_space c
1147− -- Add backslashes to the inner side of the strings
1148− --
1149− -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150− backslashes :: [String] -> [String]
1151− backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152− backslashes xs = xs
1153− -- Attaches previous and next items to each list element
1154− zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1155− zipPrevNext xs =
1156− let z =
1157− zip
1158− (zip (Nothing : map Just xs) xs)
1159− (map Just (tail xs) ++ repeat Nothing)
1160− in map (\((p, x), n) -> (p, x, n)) z
1161− orig (_, x, _) = x
1162−
1163−----------------------------------------------------------------------------
1164−-- Helpers
1165−
1166−-- | Return the wrapping function controlling the use of braces according to
1167−-- the current layout.
1168−layoutToBraces :: Layout -> R () -> R ()
1169−layoutToBraces = \case
1170− SingleLine -> useBraces
1171− MultiLine -> id
1172−
1173−-- | Append each element in both lists with semigroups. If one list is shorter
1174−-- than the other, return the rest of the longer list unchanged.
1175−liftAppend :: Semigroup a => [a] -> [a] -> [a]
1176−liftAppend [] [] = []
1177−liftAppend [] (y : ys) = y : ys
1178−liftAppend (x : xs) [] = x : xs
1179−liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
1180−
1181−getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1182−getGRHSSpan (GRHS NoExtField guards body) =
1183− combineSrcSpans' $ getLoc body :| map getLoc guards
1184−getGRHSSpan (XGRHS x) = noExtCon x
1185−
1186−-- | Place a thing that may have a hanging form. This function handles how
1187−-- to separate it from preceding expressions and whether to bump indentation
1188−-- depending on what sort of expression we have.
1189−placeHanging :: Placement -> R () -> R ()
1190−placeHanging placement m =
1191− case placement of
1192− Hanging -> do
1193− space
1194− m
1195− Normal -> do
1196− breakpoint
1197− inci m
1198−
1199−-- | Check if given block contains single expression which has a hanging
1200−-- form.
1201−blockPlacement ::
1202− (body -> Placement) ->
1203− [LGRHS GhcPs (Located body)] ->
1204− Placement
1205−blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
1206−blockPlacement _ _ = Normal
1207−
1208−-- | Check if given command has a hanging form.
1209−cmdPlacement :: HsCmd GhcPs -> Placement
1210−cmdPlacement = \case
1211− HsCmdLam NoExtField _ -> Hanging
1212− HsCmdCase NoExtField _ _ -> Hanging
1213− HsCmdDo NoExtField _ -> Hanging
1214− _ -> Normal
1215−
1216−cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1217−cmdTopPlacement = \case
1218− HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219− XCmdTop x -> noExtCon x
1220−
1221−-- | Check if given expression has a hanging form.
1222−exprPlacement :: HsExpr GhcPs -> Placement
1223−exprPlacement = \case
1224− -- Only hang lambdas with single line parameter lists
1225− HsLam NoExtField mg -> case mg of
1226− MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
1227− | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
1228− Hanging
1229− _ -> Normal
1230− HsLamCase NoExtField _ -> Hanging
1231− HsCase NoExtField _ _ -> Hanging
1232− HsDo NoExtField DoExpr _ -> Hanging
1233− HsDo NoExtField MDoExpr _ -> Hanging
1234− OpApp NoExtField _ op y ->
1235− case (fmap getOpNameStr . getOpName . unLoc) op of
1236− Just "$" -> exprPlacement (unLoc y)
1237− _ -> Normal
1238− HsApp NoExtField _ y -> exprPlacement (unLoc y)
1239− HsProc NoExtField p _ ->
1240− -- Indentation breaks if pattern is longer than one line and left
1241− -- hanging. Consequently, only apply hanging when it is safe.
1242− if isOneLineSpan (getLoc p)
1243− then Hanging
1244− else Normal
1245− _ -> Normal
1246−
1247−withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1248−withGuards = any (checkOne . unLoc)
1249− where
1250− checkOne :: GRHS GhcPs (Located body) -> Bool
1251− checkOne (GRHS NoExtField [] _) = False
1252− checkOne _ = True
1253−
1254−exprOpTree :: LHsExpr GhcPs -> OpTree (LHsExpr GhcPs) (LHsExpr GhcPs)
1255−exprOpTree (L _ (OpApp NoExtField x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
1256−exprOpTree n = OpNode n
1257−
1258−getOpName :: HsExpr GhcPs -> Maybe RdrName
1259−getOpName = \case
1260− HsVar NoExtField (L _ a) -> Just a
1261− _ -> Nothing
1262−
1263−getOpNameStr :: RdrName -> String
1264−getOpNameStr = occNameString . rdrNameOcc
1265−
1266−p_exprOpTree ::
1267− -- | Bracket style to use
1268− BracketStyle ->
1269− OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) ->
1270− R ()
1271−p_exprOpTree s (OpNode x) = located x (p_hsExpr' s)
1272−p_exprOpTree s (OpBranch x op y) = do
1273− -- If the beginning of the first argument and the second argument are on
1274− -- the same line, and the second argument has a hanging form, use hanging
1275− -- placement.
1276− let placement =
1277− if isOneLineSpan
1278− (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1279− then case y of
1280− OpNode (L _ n) -> exprPlacement n
1281− _ -> Normal
1282− else Normal
1283− -- Distinguish holes used in infix notation.
1284− -- eg. '1 _foo 2' and '1 `_foo` 2'
1285− opWrapper = case unLoc op of
1286− HsUnboundVar NoExtField _ -> backticks
1287− _ -> id
1288− layout <- getLayout
1289− let ub = case layout of
1290− SingleLine -> useBraces
1291− MultiLine -> case placement of
1292− Hanging -> useBraces
1293− Normal -> dontUseBraces
1294− opNameStr = (fmap getOpNameStr . getOpName . unLoc) op
1295− gotDollar = opNameStr == Just "$"
1296− gotColon = opNameStr == Just ":"
1297− gotRecordDot = isRecordDot (unLoc op) (opTreeLoc y)
1298− lhs =
1299− switchLayout [opTreeLoc x] $
1300− p_exprOpTree s x
1301− p_op = located op (opWrapper . p_hsExpr)
1302− p_y = switchLayout [opTreeLoc y] (p_exprOpTree N y)
1303− isSection = case (opTreeLoc x, getLoc op) of
1304− (RealSrcSpan treeSpan, RealSrcSpan opSpan) ->
1305− srcSpanEndCol treeSpan /= srcSpanStartCol opSpan
1306− _ -> False
1307− isDoBlock = \case
1308− OpNode (L _ HsDo {}) -> True
1309− _ -> False
1310− useRecordDot' <- useRecordDot
1311− if
1312− | gotColon -> do
1313− lhs
1314− space
1315− p_op
1316− case placement of
1317− Hanging -> do
1318− space
1319− p_y
1320− Normal -> do
1321− breakpoint
1322− inciIf (isDoBlock y) p_y
1323− | gotDollar
1324− && isOneLineSpan (opTreeLoc x)
1325− && placement == Normal -> do
1326− useBraces lhs
1327− space
1328− p_op
1329− breakpoint
1330− inci p_y
1331− | useRecordDot' && gotRecordDot -> do
1332− lhs
1333− when isSection space
1334− p_op
1335− p_y
1336− | otherwise -> do
1337− ub lhs
1338− placeHanging placement $ do
1339− p_op
1340− space
1341− p_y
1342−
1343−-- | Return 'True' if given expression is a record-dot operator expression.
1344−isRecordDot ::
1345− -- | Operator expression
1346− HsExpr GhcPs ->
1347− -- | Span of the expression on the right-hand side of the operator
1348− SrcSpan ->
1349− Bool
1350−isRecordDot op (RealSrcSpan ySpan) = case op of
1351− HsVar NoExtField (L (RealSrcSpan opSpan) opName) ->
1352− (getOpNameStr opName == ".") && (srcSpanEndCol opSpan == srcSpanStartCol ySpan)
1353− _ -> False
1354−isRecordDot _ _ = False
1355−
1356−-- | Get annotations for the enclosing element.
1357−getEnclosingAnns :: R [AnnKeywordId]
1358−getEnclosingAnns = do
1359− e <- getEnclosingSpan (const True)
1360− case e of
1361− Nothing -> return []
1362− Just e' -> getAnns (RealSrcSpan e')