@@ -1,13 +1,15 @@
1−{-# LANGUAGE LambdaCase #-}
1+{-# LANGUAGE LambdaCase #-}
2+{-# LANGUAGE MultiWayIf #-}
23{-# LANGUAGE OverloadedStrings #-}
3−{-# LANGUAGE RecordWildCards #-}
4+{-# LANGUAGE RecordWildCards #-}
5+{-# LANGUAGE TypeApplications #-}
46
57module Ormolu.Printer.Meat.Declaration.Value
6− ( p_valDecl
7− , p_pat
8− , p_hsExpr
9− , p_hsSplice
10− , p_stringLit
8+ ( p_valDecl,
9+ p_pat,
10+ p_hsExpr,
11+ p_hsSplice,
12+ p_stringLit,
1113 )
1214where
1315
@@ -18,24 +20,24 @@ import Ctype (is_space)
1820import Data.Bool (bool)
1921import Data.Char (isPunctuation, isSymbol)
2022import Data.Data hiding (Infix, Prefix)
23+import Data.Functor ((<&>))
2124import Data.List (intersperse, sortOn)
22−import Data.List.NonEmpty (NonEmpty ((:|)))
25+import Data.List.NonEmpty (NonEmpty (..), (<|))
26+import qualified Data.List.NonEmpty as NE
2327import Data.Text (Text)
2428import qualified Data.Text as Text
2529import GHC
30+import OccName (occNameString)
2631import Ormolu.Printer.Combinators
32+import Ormolu.Printer.Internal
2733import Ormolu.Printer.Meat.Common
34+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
2835import Ormolu.Printer.Meat.Declaration.Signature
2936import Ormolu.Printer.Meat.Type
3037import Ormolu.Printer.Operators
3138import Ormolu.Utils
32−import RdrName (rdrNameOcc)
33−import SrcLoc (combineSrcSpans, isOneLineSpan)
34−import qualified Data.List.NonEmpty as NE
35−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
3639
3740-- | Style of a group of equations.
38−
3941data MatchGroupStyle
4042 = Function (Located RdrName)
4143 | PatternBind
@@ -44,56 +46,61 @@ data MatchGroupStyle
4446 | LambdaCase
4547
4648-- | Style of equations in a group.
47−
4849data GroupStyle
4950 = EqualSign
5051 | RightArrow
5152
5253-- | Expression placement. This marks the places where expressions that
5354-- implement handing forms may use them.
54−
5555data Placement
56− = Normal -- ^ Multi-line layout should cause
57− -- insertion of a newline and indentation
58− -- bump
59− | Hanging -- ^ Expressions that have hanging form
60− -- should use it and avoid bumping one level
61− -- of indentation
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)
6265
6366p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
6467p_valDecl = \case
65− FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
66− PatBind NoExt pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
68+ FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
69+ PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
6770 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
6871 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
69− PatSynBind NoExt psb -> p_patSynBind psb
70− XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
72+ PatSynBind NoExtField psb -> p_patSynBind psb
73+ XHsBindsLR x -> noExtCon x
7174
72−p_funBind
73− :: Located RdrName
74− -> MatchGroup GhcPs (LHsExpr GhcPs)
75− -> R ()
75+p_funBind ::
76+ Located RdrName ->
77+ MatchGroup GhcPs (LHsExpr GhcPs) ->
78+ R ()
7679p_funBind name = p_matchGroup (Function name)
7780
78−p_matchGroup
79− :: MatchGroupStyle
80− -> MatchGroup GhcPs (LHsExpr GhcPs)
81− -> R ()
81+p_matchGroup ::
82+ MatchGroupStyle ->
83+ MatchGroup GhcPs (LHsExpr GhcPs) ->
84+ R ()
8285p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
8386
84−p_matchGroup'
85− :: Data body
86− => (body -> Placement) -- ^ How to get body placement
87− -> (body -> R ()) -- ^ How to print body
88− -> MatchGroupStyle -- ^ Style of this group of equations
89− -> MatchGroup GhcPs (Located body) -- ^ Match group
90− -> R ()
91−p_matchGroup' placer pretty style MG {..} = do
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
9299 let ob = case style of
93100 Case -> id
94101 LambdaCase -> id
95102 _ -> dontUseBraces
96− -- NOTE since we are forcing braces on 'sepSemi' based on 'ob', we have to
103+ -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
97104 -- restore the brace state inside the sepsemi.
98105 ub <- bool dontUseBraces useBraces <$> canUseBraces
99106 ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
@@ -101,14 +108,14 @@ p_matchGroup' placer pretty style MG {..} = do
101108 p_Match m@Match {..} =
102109 p_match'
103110 placer
104− pretty
111+ render
105112 (adjustMatchGroupStyle m style)
106113 (isInfixMatch m)
107114 (matchStrictness m)
108115 m_pats
109116 m_grhss
110− p_Match _ = notImplemented "XMatch"
111−p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
117+ p_Match (XMatch x) = noExtCon x
118+p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
112119
113120-- | Function id obtained through pattern matching on 'FunBind' should not
114121-- be used to print the actual equations because the different ‘RdrNames’
@@ -116,11 +123,10 @@ p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
116123-- and paretheses) associated with them. It is necessary to use per-equation
117124-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
118125-- name inside of 'Function' accordingly.
119−
120−adjustMatchGroupStyle
121− :: Match GhcPs body
122− -> MatchGroupStyle
123− -> MatchGroupStyle
126+adjustMatchGroupStyle ::
127+ Match GhcPs body ->
128+ MatchGroupStyle ->
129+ MatchGroupStyle
124130adjustMatchGroupStyle m = \case
125131 Function _ -> (Function . mc_fun . m_ctxt) m
126132 style -> style
@@ -128,31 +134,43 @@ adjustMatchGroupStyle m = \case
128134matchStrictness :: Match id body -> SrcStrictness
129135matchStrictness match =
130136 case m_ctxt match of
131− FunRhs{mc_strictness=s} -> s
137+ FunRhs {mc_strictness = s} -> s
132138 _ -> NoSrcStrict
133139
134−p_match
135− :: MatchGroupStyle -- ^ Style of the group
136− -> Bool -- ^ Is this an infix match?
137− -> SrcStrictness -- ^ Strictness prefix (FunBind)
138− -> [LPat GhcPs] -- ^ Argument patterns
139− -> GRHSs GhcPs (LHsExpr GhcPs) -- ^ Equations
140− -> R ()
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 ()
141152p_match = p_match' exprPlacement p_hsExpr
142153
143−p_match'
144− :: Data body
145− => (body -> Placement) -- ^ How to get body placement
146− -> (body -> R ()) -- ^ How to print body
147− -> MatchGroupStyle -- ^ Style of this group of equations
148− -> Bool -- ^ Is this an infix match?
149− -> SrcStrictness -- ^ Strictness prefix (FunBind)
150− -> [LPat GhcPs] -- ^ Argument patterns
151− -> GRHSs GhcPs (Located body) -- ^ Equations
152− -> R ()
153−p_match' placer pretty style isInfix strictness m_pats m_grhss = do
154− -- NOTE Normally, since patterns may be placed in a multi-line layout, it
155− -- is necessary to bump indentation for the pattern group so it's more
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
156174 -- indented than function name. This in turn means that indentation for
157175 -- the body should also be bumped. Normally this would mean that bodies
158176 -- would start with two indentation steps applied, which is ugly, so we
@@ -162,23 +180,24 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
162180 NoSrcStrict -> return ()
163181 SrcStrict -> txt "!"
164182 SrcLazy -> txt "~"
165− inci' <- case NE.nonEmpty m_pats of
166− Nothing -> id <$ case style of
167− Function name -> p_rdrName name
168− _ -> return ()
183+ indentBody <- case NE.nonEmpty m_pats of
184+ Nothing ->
185+ False <$ case style of
186+ Function name -> p_rdrName name
187+ _ -> return ()
169188 Just ne_pats -> do
170− let combinedSpans = combineSrcSpans' $
171− getLoc <$> ne_pats
172− inci' = if isOneLineSpan combinedSpans
173− then id
174− else inci
189+ let combinedSpans = case style of
190+ Function name -> combineSrcSpans (getLoc name) patSpans
191+ _ -> patSpans
192+ patSpans = combineSrcSpans' (getLoc <$> ne_pats)
193+ indentBody = not (isOneLineSpan combinedSpans)
175194 switchLayout [combinedSpans] $ do
176195 let stdCase = sep breakpoint (located' p_pat) m_pats
177196 case style of
178197 Function name ->
179198 p_infixDefHelper
180199 isInfix
181− inci'
200+ indentBody
182201 (p_rdrName name)
183202 (located' p_pat <$> m_pats)
184203 PatternBind -> stdCase
@@ -193,46 +212,40 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
193212 when needsSpace space
194213 sitcc stdCase
195214 LambdaCase -> stdCase
196− return inci'
197− let
198− -- Calculate position of end of patterns. This is useful when we decide
199− -- about putting certain constructions in hanging positions.
200− endOfPats = case NE.nonEmpty m_pats of
201− Nothing -> case style of
202− Function name -> (Just . srcSpanEnd . getLoc) name
203− _ -> Nothing
204− Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
205− isCase = \case
206− Case -> True
207− LambdaCase -> True
208− _ -> False
209− let GRHSs {..} = m_grhss
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
210227 hasGuards = withGuards grhssGRHSs
211− unless (length grhssGRHSs > 1) $ do
212− case style of
213− Function _ | hasGuards -> return ()
214− Function _ -> space >> txt "="
215− PatternBind -> space >> txt "="
216− s | isCase s && hasGuards -> return ()
217− _ -> space >> txt "->"
218− let grhssSpan = combineSrcSpans' $
219− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
220− patGrhssSpan = maybe grhssSpan
221− (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
228+ grhssSpan =
229+ combineSrcSpans' $
230+ getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
231+ patGrhssSpan =
232+ maybe
233+ grhssSpan
234+ (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
235+ endOfPats
222236 placement =
223237 case endOfPats of
224238 Nothing -> blockPlacement placer grhssGRHSs
225239 Just spn ->
226− if isOneLineSpan
227− (mkSrcSpan spn (srcSpanStart grhssSpan))
240+ if onTheSameLine spn grhssSpan
228241 then blockPlacement placer grhssGRHSs
229242 else Normal
230243 p_body = do
231244 let groupStyle =
232245 if isCase style && hasGuards
233− then RightArrow
234− else EqualSign
235− sep newline (located' (p_grhs' placer pretty groupStyle)) grhssGRHSs
246+ then RightArrow
247+ else EqualSign
248+ sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
236249 p_where = do
237250 let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
238251 unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
@@ -240,186 +253,211 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
240253 txt "where"
241254 unless whereIsEmpty breakpoint
242255 inci $ located grhssLocalBinds p_hsLocalBinds
243− inci' $ do
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 "->"
244264 switchLayout [patGrhssSpan] $
245265 placeHanging placement p_body
246266 inci p_where
267+p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
247268
248269p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
249270p_grhs = p_grhs' exprPlacement p_hsExpr
250271
251−p_grhs'
252− :: Data body
253− => (body -> Placement) -- ^ How to get body placement
254− -> (body -> R ()) -- ^ How to print body
255− -> GroupStyle
256− -> GRHS GhcPs (Located body)
257− -> R ()
258−p_grhs' placer pretty style (GRHS NoExt guards body) =
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) =
259282 case guards of
260283 [] -> p_body
261284 xs -> do
262285 txt "|"
263286 space
264− sitcc (sep (comma >> breakpoint) (sitcc . located' p_stmt) xs)
287+ sitcc (sep commaDel (sitcc . located' p_stmt) xs)
265288 space
266− txt $ case style of
267− EqualSign -> "="
268− RightArrow -> "->"
289+ inci $ case style of
290+ EqualSign -> equals
291+ RightArrow -> txt "->"
269292 placeHanging placement p_body
270293 where
271294 placement =
272295 case endOfGuards of
273296 Nothing -> placer (unLoc body)
274297 Just spn ->
275− if isOneLineSpan (mkSrcSpan spn (srcSpanStart (getLoc body)))
276− then placer (unLoc body)
277− else Normal
298+ if onTheSameLine spn (getLoc body)
299+ then placer (unLoc body)
300+ else Normal
278301 endOfGuards =
279302 case NE.nonEmpty guards of
280303 Nothing -> Nothing
281− Just gs -> (Just . srcSpanEnd . getLoc . NE.last) gs
282− p_body = located body pretty
283−p_grhs' _ _ _ (XGRHS NoExt) = notImplemented "XGRHS"
304+ Just gs -> (Just . getLoc . NE.last) gs
305+ p_body = located body render
306+p_grhs' _ _ _ (XGRHS x) = noExtCon x
284307
285308p_hsCmd :: HsCmd GhcPs -> R ()
286309p_hsCmd = \case
287− HsCmdArrApp NoExt body input arrType _ -> do
310+ HsCmdArrApp NoExtField body input arrType _ -> do
288311 located body p_hsExpr
289− space
290− case arrType of
291− HsFirstOrderApp -> txt "-<"
292− HsHigherOrderApp -> txt "-<<"
293− placeHanging (exprPlacement (unLoc input)) $
294− located input p_hsExpr
295− HsCmdArrForm NoExt form Prefix _ cmds -> banana $ sitcc $ do
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
296320 located form p_hsExpr
297321 unless (null cmds) $ do
298322 breakpoint
299323 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
300− HsCmdArrForm NoExt form Infix _ [left, right] -> do
324+ HsCmdArrForm NoExtField form Infix _ [left, right] -> do
301325 located left p_hsCmdTop
302326 space
303327 located form p_hsExpr
304328 placeHanging (cmdTopPlacement (unLoc right)) $
305329 located right p_hsCmdTop
306− HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
330+ HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
307331 HsCmdApp {} ->
308332 -- XXX Does this ever occur in the syntax tree? It does not seem like it
309333 -- does. Open an issue and ping @yumiova if this ever occurs in output.
310334 notImplemented "HsCmdApp"
311− HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
312− HsCmdPar NoExt c -> parens (located c p_hsCmd)
313− HsCmdCase NoExt e mgroup -> do
314− txt "case"
315− space
316− located e p_hsExpr
317− space
318− txt "of"
319− breakpoint
320− inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
321− HsCmdIf NoExt _ if' then' else' -> do
322− txt "if"
323− space
324− located if' p_hsExpr
325− breakpoint
326− txt "then"
327− located then' $ \x -> do
328− breakpoint
329− inci (p_hsCmd x)
330− breakpoint
331− txt "else"
332− located else' $ \x -> do
333− breakpoint
334− inci (p_hsCmd x)
335− HsCmdLet NoExt localBinds c -> do
336− txt "let"
337− space
338− sitcc (located localBinds p_hsLocalBinds)
339− breakpoint
340− txt "in"
341− space
342− sitcc (located c p_hsCmd)
343− HsCmdDo NoExt es -> do
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
344344 txt "do"
345345 newline
346− inci (located es (sitcc . sep newline (located' (sitcc . p_stmt' p_hsCmd))))
346+ inci . located es $
347+ sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
347348 HsCmdWrap {} -> notImplemented "HsCmdWrap"
348− XCmd {} -> notImplemented "XCmd"
349+ XCmd x -> noExtCon x
349350
350351p_hsCmdTop :: HsCmdTop GhcPs -> R ()
351352p_hsCmdTop = \case
352− HsCmdTop NoExt cmd -> located cmd p_hsCmd
353− XCmdTop {} -> notImplemented "XHsCmdTop"
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)
354384
355385p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
356−p_stmt = p_stmt' p_hsExpr
386+p_stmt = p_stmt' exprPlacement p_hsExpr
357387
358−p_stmt'
359− :: Data body
360− => (body -> R ())
361− -> Stmt GhcPs (Located body)
362− -> R ()
363−p_stmt' pretty = \case
364− LastStmt NoExt body _ _ -> located body pretty
365− BindStmt NoExt l f _ _ -> do
366− located l p_pat
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
367401 space
368402 txt "<-"
369− breakpoint
370− inci (located f pretty)
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)
371413 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
372− BodyStmt NoExt body _ _ -> located body pretty
373− LetStmt NoExt binds -> do
414+ BodyStmt NoExtField body _ _ -> located body render
415+ LetStmt NoExtField binds -> do
374416 txt "let"
375417 space
376418 sitcc $ located binds p_hsLocalBinds
377419 ParStmt {} ->
378− -- NOTE 'ParStmt' should always be eliminated in 'gatherStmt' already,
379− -- such that it never occurs in 'p_stmt''. Consequently, handling it
380− -- here would be redundant.
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.
381423 notImplemented "ParStmt"
382− TransStmt {..} -> do
383− -- NOTE 'TransStmt' only needs to account for pretty printing itself,
384− -- since pretty printing of relevant statements (e.g., in 'trS_stmts')
385− -- is handled through 'gatherStmt'.
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'.
386428 case (trS_form, trS_by) of
387− (ThenForm, Nothing) -> located trS_using $ \x -> do
429+ (ThenForm, Nothing) -> do
388430 txt "then"
389431 breakpoint
390− inci (p_hsExpr x)
432+ inci $ located trS_using p_hsExpr
391433 (ThenForm, Just e) -> do
392− located trS_using $ \x -> do
393− txt "then"
394− breakpoint
395− inci (p_hsExpr x)
434+ txt "then"
396435 breakpoint
397− located e $ \x -> do
398− txt "by"
399− breakpoint
400− inci (p_hsExpr x)
401− (GroupForm, Nothing) -> located trS_using $ \x -> do
436+ inci $ located trS_using p_hsExpr
437+ breakpoint
438+ txt "by"
439+ breakpoint
440+ inci $ located e p_hsExpr
441+ (GroupForm, Nothing) -> do
402442 txt "then group using"
403443 breakpoint
404− inci (p_hsExpr x)
444+ inci $ located trS_using p_hsExpr
405445 (GroupForm, Just e) -> do
406− located e $ \x -> do
407− txt "then group by"
408− breakpoint
409− inci (p_hsExpr x)
446+ txt "then group by"
410447 breakpoint
411− located trS_using $ \x -> do
412− txt "using"
413− breakpoint
414− inci (p_hsExpr x)
448+ inci $ located e p_hsExpr
449+ breakpoint
450+ txt "using"
451+ breakpoint
452+ inci $ located trS_using p_hsExpr
415453 RecStmt {..} -> do
416454 txt "rec"
417455 space
418− sitcc $ sepSemi (located' (p_stmt' pretty)) recS_stmts
419− XStmtLR {} -> notImplemented "XStmtLR"
456+ sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457+ XStmtLR c -> noExtCon c
420458
421459gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
422−gatherStmt (L _ (ParStmt NoExt block _ _)) =
460+gatherStmt (L _ (ParStmt NoExtField block _ _)) =
423461 foldr ((<>) . gatherStmtBlock) [] block
424462gatherStmt (L s stmt@TransStmt {..}) =
425463 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
@@ -428,182 +466,230 @@ gatherStmt stmt = [[stmt]]
428466gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
429467gatherStmtBlock (ParStmtBlock _ stmts _ _) =
430468 foldr (liftAppend . gatherStmt) [] stmts
431−gatherStmtBlock XParStmtBlock {} = notImplemented "XParStmtBlock"
469+gatherStmtBlock (XParStmtBlock x) = noExtCon x
432470
433471p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
434472p_hsLocalBinds = \case
435− HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
436− let ssStart = either
437− (srcSpanStart . getLoc)
438− (srcSpanStart . getLoc)
439− items =
440− (Left <$> bagToList bag) ++ (Right <$> lsigs)
441− p_item (Left x) = located x p_valDecl
442− p_item (Right x) = located x p_sigDecl
443− -- Assigns 'False' to the last element, 'True' to the rest.
444− markInit :: [a] -> [(Bool, a)]
445− markInit [] = []
446− markInit (x:[]) = [(False, x)]
447− markInit (x:xs) = (True, x) : markInit xs
448− -- NOTE When in a single-line layout, there is a chance that the inner
473+ HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
474+ -- When in a single-line layout, there is a chance that the inner
449475 -- elements will also contain semicolons and they will confuse the
450476 -- parser. so we request braces around every element except the last.
451− br <- vlayout (return useBraces) (return id)
452− sitcc $ sepSemi
453− (\(m, i) -> (if m then br else id) $ p_item i)
454− (markInit $ sortOn ssStart items)
455− HsValBinds NoExt _ -> notImplemented "HsValBinds"
456− HsIPBinds NoExt (IPBinds NoExt xs) ->
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) ->
457494 -- Second argument of IPBind is always Left before type-checking.
458− let p_ipBind (IPBind NoExt (Left name) expr) = do
495+ let p_ipBind (IPBind NoExtField (Left name) expr) = do
459496 atom name
460497 space
461− txt "="
498+ equals
462499 breakpoint
463500 useBraces $ inci $ located expr p_hsExpr
464− p_ipBind _ = notImplemented "XHsIPBinds"
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
465505 in sepSemi (located' p_ipBind) xs
466− HsIPBinds NoExt _ -> notImplemented "HsIpBinds"
467− EmptyLocalBinds NoExt -> return ()
468− XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
506+ HsIPBinds NoExtField _ -> notImplemented "HsIpBinds"
507+ EmptyLocalBinds NoExtField -> return ()
508+ XHsLocalBindsLR x -> noExtCon x
469509
470−p_hsRecField
471− :: HsRecField' RdrName (LHsExpr GhcPs)
472− -> R ()
473−p_hsRecField = \HsRecField {..} -> do
510+p_hsRecField ::
511+ HsRecField' RdrName (LHsExpr GhcPs) ->
512+ R ()
513+p_hsRecField HsRecField {..} = do
474514 p_rdrName hsRecFieldLbl
475515 unless hsRecPun $ do
476516 space
477− txt "="
478− let placement = exprPlacement (unLoc hsRecFieldArg)
479− placeHanging placement $ located hsRecFieldArg p_hsExpr
480−
481−p_hsTupArg :: HsTupArg GhcPs -> R ()
482−p_hsTupArg = \case
483− Present NoExt x -> located x p_hsExpr
484− Missing NoExt -> pure ()
485− XTupArg {} -> notImplemented "XTupArg"
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)
486523
487524p_hsExpr :: HsExpr GhcPs -> R ()
488−p_hsExpr = \case
489− HsVar NoExt name -> p_rdrName name
490− HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
491− HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
492− HsRecFld NoExt x ->
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 ->
493533 case x of
494− Unambiguous NoExt name -> p_rdrName name
495− Ambiguous NoExt name -> p_rdrName name
496− XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
497− HsOverLabel NoExt _ v -> do
534+ Unambiguous NoExtField name -> p_rdrName name
535+ Ambiguous NoExtField name -> p_rdrName name
536+ XAmbiguousFieldOcc xx -> noExtCon xx
537+ HsOverLabel NoExtField _ v -> do
498538 txt "#"
499539 atom v
500− HsIPVar NoExt (HsIPName name) -> do
540+ HsIPVar NoExtField (HsIPName name) -> do
501541 txt "?"
502542 atom name
503− HsOverLit NoExt v -> atom (ol_val v)
504− HsLit NoExt lit ->
543+ HsOverLit NoExtField v -> atom (ol_val v)
544+ HsLit NoExtField lit ->
505545 case lit of
506− HsString (SourceText s) _ -> p_stringLit s
507− HsStringPrim (SourceText s) _ -> p_stringLit s
546+ HsString (SourceText stxt) _ -> p_stringLit stxt
547+ HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
508548 r -> atom r
509− HsLam NoExt mgroup ->
549+ HsLam NoExtField mgroup ->
510550 p_matchGroup Lambda mgroup
511− HsLamCase NoExt mgroup -> do
551+ HsLamCase NoExtField mgroup -> do
512552 txt "\\case"
513553 breakpoint
514554 inci (p_matchGroup LambdaCase mgroup)
515− HsApp NoExt f x -> sitcc $ do
516− located f p_hsExpr
517− -- Second argument can be a `do` or `case` block with `-XBlockArguments`.
518− placeHanging (exprPlacement (unLoc x)) $
519− located x p_hsExpr
520− HsAppType a e -> do
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
521612 located e p_hsExpr
522613 breakpoint
523614 inci $ do
524615 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 ()
525621 located (hswc_body a) p_hsType
526− OpApp NoExt x op y -> do
622+ OpApp NoExtField x op y -> do
527623 let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
528− getOpName = \case
529− HsVar NoExt (L _ a) -> Just a
530− _ -> Nothing
531− p_exprOpTree (reassociateOpTree getOpName opTree)
532− NegApp NoExt e _ -> do
624+ p_exprOpTree s (reassociateOpTree getOpName opTree)
625+ NegApp NoExtField e _ -> do
533626 txt "-"
534627 space
535628 located e p_hsExpr
536− HsPar NoExt e -> parens (located e p_hsExpr)
537− SectionL NoExt x op -> do
629+ HsPar NoExtField e ->
630+ parens s (located e (dontUseBraces . p_hsExpr))
631+ SectionL NoExtField x op -> do
538632 located x p_hsExpr
539633 breakpoint
540634 inci (located op p_hsExpr)
541− SectionR NoExt op x -> do
635+ SectionR NoExtField op x -> do
542636 located op p_hsExpr
543− breakpoint
637+ useRecordDot' <- useRecordDot
638+ let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639+ unless (useRecordDot' && isRecordDot') breakpoint
544640 inci (located x p_hsExpr)
545− ExplicitTuple NoExt args boxity -> do
641+ ExplicitTuple NoExtField args boxity ->
546642 let isSection = any (isMissing . unLoc) args
547643 isMissing = \case
548− Missing NoExt -> True
644+ Missing NoExtField -> True
549645 _ -> False
550− let parens' =
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' =
551652 case boxity of
552653 Boxed -> parens
553654 Unboxed -> parensHash
554− if isSection
555− then switchLayout [] . parens' $
556− sep comma (located' p_hsTupArg) args
557− else switchLayout (getLoc <$> args) . parens' . sitcc $
558− sep (comma >> breakpoint) (sitcc . located' p_hsTupArg) args
559− ExplicitSum NoExt tag arity e ->
560− p_unboxedSum tag arity (located e p_hsExpr)
561− HsCase NoExt e mgroup -> do
562− txt "case"
563− space
564− located e p_hsExpr
565− space
566− txt "of"
567− breakpoint
568− inci (p_matchGroup Case mgroup)
569− HsIf NoExt _ if' then' else' -> do
570− txt "if"
571− space
572− located if' p_hsExpr
573− breakpoint
574− inci $ do
575− txt "then"
576− located then' $ \x ->
577− placeHanging (exprPlacement x) (p_hsExpr x)
578− breakpoint
579− txt "else"
580− located else' $ \x ->
581− placeHanging (exprPlacement x) (p_hsExpr x)
582− HsMultiIf NoExt guards -> do
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
583669 txt "if"
584670 breakpoint
585− inci . sitcc $ sep newline (located' (p_grhs RightArrow)) guards
586− HsLet NoExt localBinds e -> sitcc $ do
587− txt "let"
588− space
589− dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
590− vlayout space (newline >> txt " ")
591− txt "in"
592− space
593− sitcc (located e p_hsExpr)
594− HsDo NoExt ctx es -> do
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
595675 let doBody header = do
596676 txt header
597677 breakpoint
598− ub <- vlayout (return useBraces) (return id)
599− inci $ sepSemi (located' (ub . p_stmt)) (unLoc es)
600− compBody = brackets $ located es $ \xs -> do
601− let p_parBody = sep
602− (breakpoint >> txt "| ")
603− p_seqBody
604− p_seqBody = sitcc . sep
605− (comma >> breakpoint)
606− (located' (sitcc . p_stmt))
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))
607693 stmts = init xs
608694 yield = last xs
609695 lists = foldr (liftAppend . gatherStmt) [] stmts
@@ -617,90 +703,100 @@ p_hsExpr = \case
617703 MDoExpr -> doBody "mdo"
618704 ListComp -> compBody
619705 MonadComp -> notImplemented "MonadComp"
620− ArrowExpr -> notImplemented "ArrowExpr"
706+ ArrowExpr -> notImplemented "ArrowExpr"
621707 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
622708 PatGuard _ -> notImplemented "PatGuard"
623709 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
624710 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
625711 ExplicitList _ _ xs ->
626− brackets . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_hsExpr) xs
712+ brackets s $
713+ sep commaDel (sitcc . located' p_hsExpr) xs
627714 RecordCon {..} -> do
628715 located rcon_con_name atom
629716 breakpoint
630717 let HsRecFields {..} = rcon_flds
631− updName f = f {
632− hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
633− FieldOcc _ n -> n
634− XFieldOcc _ -> notImplemented "XFieldOcc"
635− }
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+ }
636724 fields = located' (p_hsRecField . updName) <$> rec_flds
637725 dotdot =
638726 case rec_dotdot of
639727 Just {} -> [txt ".."]
640728 Nothing -> []
641− inci . braces . sitcc $ sep (comma >> breakpoint) sitcc (fields <> dotdot)
729+ inci . braces N $
730+ sep commaDel sitcc (fields <> dotdot)
642731 RecordUpd {..} -> do
643732 located rupd_expr p_hsExpr
644− breakpoint
645− let updName f = f {
646− hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
647− Ambiguous _ n -> n
648− Unambiguous _ n -> n
649− XAmbiguousFieldOcc _ -> notImplemented "XAmbiguousFieldOcc"
650− }
651− inci . braces . sitcc $
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 $
652749 sep
653− (comma >> breakpoint)
750+ commaDel
654751 (sitcc . located' (p_hsRecField . updName))
655752 rupd_flds
656− ExprWithTySig affix x -> sitcc $ do
753+ ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
657754 located x p_hsExpr
755+ space
756+ txt "::"
658757 breakpoint
659− inci $ do
660− txt "::"
661− space
662− let HsWC {..} = affix
663− HsIB {..} = hswc_body
664− located hsib_body p_hsType
665− ArithSeq NoExt _ x -> do
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 ->
666762 case x of
667− From from -> brackets . sitcc $ do
763+ From from -> brackets s $ do
668764 located from p_hsExpr
669765 breakpoint
670766 txt ".."
671− FromThen from next -> brackets . sitcc $ do
672− sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
767+ FromThen from next -> brackets s $ do
768+ sep commaDel (located' p_hsExpr) [from, next]
673769 breakpoint
674770 txt ".."
675− FromTo from to -> brackets . sitcc $ do
771+ FromTo from to -> brackets s $ do
676772 located from p_hsExpr
677773 breakpoint
678774 txt ".."
679775 space
680776 located to p_hsExpr
681− FromThenTo from next to -> brackets . sitcc $ do
682− sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
777+ FromThenTo from next to -> brackets s $ do
778+ sep commaDel (located' p_hsExpr) [from, next]
683779 breakpoint
684780 txt ".."
685781 space
686782 located to p_hsExpr
687− HsSCC NoExt _ name x -> do
783+ HsSCC NoExtField _ name x -> do
688784 txt "{-# SCC "
689785 atom name
690786 txt " #-}"
691787 breakpoint
692788 located x p_hsExpr
693− HsCoreAnn NoExt _ value x -> do
789+ HsCoreAnn NoExtField _ value x -> do
694790 txt "{-# CORE "
695791 atom value
696792 txt " #-}"
697793 breakpoint
698794 located x p_hsExpr
699− HsBracket NoExt x -> p_hsBracket x
795+ HsBracket NoExtField x -> p_hsBracket x
700796 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
701797 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
702− HsSpliceE NoExt splice -> p_hsSplice splice
703− HsProc NoExt p e -> do
798+ HsSpliceE NoExtField splice -> p_hsSplice splice
799+ HsProc NoExtField p e -> do
704800 txt "proc"
705801 located p $ \x -> do
706802 breakpoint
@@ -709,65 +805,46 @@ p_hsExpr = \case
709805 txt "->"
710806 placeHanging (cmdTopPlacement (unLoc e)) $
711807 located e p_hsCmdTop
712− HsStatic _ e -> do
808+ HsStatic _ e -> do
713809 txt "static"
714810 breakpoint
715811 inci (located e p_hsExpr)
716− HsArrApp NoExt body input arrType cond ->
717− p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
718− HsArrForm NoExt form mfixity cmds ->
719− p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
720812 HsTick {} -> notImplemented "HsTick"
721813 HsBinTick {} -> notImplemented "HsBinTick"
722814 HsTickPragma {} -> notImplemented "HsTickPragma"
723− -- These four constructs should never appear in correct programs.
724− -- See: https://github.com/tweag/ormolu/issues/343
725− EWildPat NoExt -> txt "_"
726− EAsPat NoExt n p -> do
727− p_rdrName n
728− txt "@"
729− located p p_hsExpr
730− EViewPat NoExt p e -> do
731− located p p_hsExpr
732− space
733− txt "->"
734− breakpoint
735− inci (located e p_hsExpr)
736− ELazyPat NoExt p -> do
737− txt "~"
738− located p p_hsExpr
739815 HsWrap {} -> notImplemented "HsWrap"
740− XExpr {} -> notImplemented "XExpr"
816+ XExpr x -> noExtCon x
741817
742818p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
743819p_patSynBind PSB {..} = do
744− let rhs = case psb_dir of
745− Unidirectional -> do
746− txt "<-"
747− space
748− located psb_def p_pat
749− ImplicitBidirectional -> do
750− txt "="
751− space
752− located psb_def p_pat
753− ExplicitBidirectional mgroup -> do
754− txt "<-"
755− space
756− located psb_def p_pat
757− newline
758− txt "where"
759− newline
760− inci (p_matchGroup (Function psb_id) mgroup)
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)
761839 txt "pattern"
762840 case psb_args of
763841 PrefixCon xs -> do
764842 space
765843 p_rdrName psb_id
766− inci $ do
844+ inci $ do
767845 switchLayout (getLoc <$> xs) $ do
768846 unless (null xs) breakpoint
769847 sitcc (sep breakpoint p_rdrName xs)
770− breakpoint
771848 rhs
772849 RecCon xs -> do
773850 space
@@ -775,9 +852,8 @@ p_patSynBind PSB {..} = do
775852 inci $ do
776853 switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
777854 unless (null xs) breakpoint
778− braces . sitcc $
779− sep (comma >> breakpoint) (p_rdrName . recordPatSynPatVar) xs
780− breakpoint
855+ braces N $
856+ sep commaDel (p_rdrName . recordPatSynPatVar) xs
781857 rhs
782858 InfixCon l r -> do
783859 switchLayout [getLoc l, getLoc r] $ do
@@ -788,37 +864,100 @@ p_patSynBind PSB {..} = do
788864 p_rdrName psb_id
789865 space
790866 p_rdrName r
791− inci $ do
792− breakpoint
793− rhs
794−p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
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)
795934
796935p_pat :: Pat GhcPs -> R ()
797936p_pat = \case
798− WildPat NoExt -> txt "_"
799− VarPat NoExt name -> p_rdrName name
800− LazyPat NoExt pat -> do
937+ WildPat NoExtField -> txt "_"
938+ VarPat NoExtField name -> p_rdrName name
939+ LazyPat NoExtField pat -> do
801940 txt "~"
802941 located pat p_pat
803− AsPat NoExt name pat -> do
942+ AsPat NoExtField name pat -> do
804943 p_rdrName name
805944 txt "@"
806945 located pat p_pat
807− ParPat NoExt pat ->
808− located pat (parens . p_pat)
809− BangPat NoExt pat -> do
946+ ParPat NoExtField pat ->
947+ located pat (parens S . p_pat)
948+ BangPat NoExtField pat -> do
810949 txt "!"
811950 located pat p_pat
812− ListPat NoExt pats -> do
813− brackets . sitcc $ sep (comma >> breakpoint) (located' p_pat) pats
814− TuplePat NoExt pats boxing -> do
815− let f =
951+ ListPat NoExtField pats ->
952+ brackets S $ sep commaDel (located' p_pat) pats
953+ TuplePat NoExtField pats boxing -> do
954+ let parens' =
816955 case boxing of
817− Boxed -> parens
818− Unboxed -> parensHash
819− f . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_pat) pats
820− SumPat NoExt pat tag arity ->
821− p_unboxedSum tag arity (located pat p_pat)
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)
822961 ConPatIn pat details ->
823962 case details of
824963 PrefixCon xs -> sitcc $ do
@@ -832,37 +971,40 @@ p_pat = \case
832971 let f = \case
833972 Nothing -> txt ".."
834973 Just x -> located x p_pat_hsRecField
835− inci . braces . sitcc . sep (comma >> breakpoint) f $ case dotdot of
836− Nothing -> Just <$> fields
837− Just n -> (Just <$> take n fields) ++ [Nothing]
838− InfixCon x y -> do
839− located x p_pat
840− space
841− p_rdrName pat
842− breakpoint
843− inci (located y p_pat)
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
844986 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
845− ViewPat NoExt expr pat -> sitcc $ do
987+ ViewPat NoExtField expr pat -> sitcc $ do
846988 located expr p_hsExpr
847989 space
848990 txt "->"
849991 breakpoint
850992 inci (located pat p_pat)
851− SplicePat NoExt splice -> p_hsSplice splice
852− LitPat NoExt p -> atom p
853− NPat NoExt v _ _ -> located v (atom . ol_val)
854− NPlusKPat NoExt n k _ _ _ -> sitcc $ do
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
855997 p_rdrName n
856998 breakpoint
857999 inci $ do
8581000 txt "+"
8591001 space
8601002 located k (atom . ol_val)
861− SigPat hswc pat -> do
1003+ SigPat NoExtField pat hswc -> do
8621004 located pat p_pat
8631005 p_typeAscription hswc
8641006 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
865− XPat NoExt -> notImplemented "XPat"
1007+ XPat x -> noExtCon x
8661008
8671009p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
8681010p_pat_hsRecField HsRecField {..} = do
@@ -870,51 +1012,53 @@ p_pat_hsRecField HsRecField {..} = do
8701012 p_rdrName (rdrNameFieldOcc x)
8711013 unless hsRecPun $ do
8721014 space
873− txt "="
1015+ equals
8741016 breakpoint
8751017 inci (located hsRecFieldArg p_pat)
8761018
877−p_unboxedSum :: ConTag -> Arity -> R () -> R ()
878−p_unboxedSum tag arity m = do
1019+p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
1020+p_unboxedSum s tag arity m = do
8791021 let before = tag - 1
8801022 after = arity - before - 1
8811023 args = replicate before Nothing <> [Just m] <> replicate after Nothing
882− f (x,i) = do
883− let isFirst = i == 0
884− isLast = i == arity - 1
1024+ f x =
8851025 case x :: Maybe (R ()) of
8861026 Nothing ->
887− unless (isFirst || isLast) space
1027+ space
8881028 Just m' -> do
889− unless isFirst space
1029+ space
8901030 m'
891− unless isLast space
892− parensHash $ sep (txt "|") f (zip args [0..])
1031+ space
1032+ parensHash s $ sep (txt "|") f args
8931033
8941034p_hsSplice :: HsSplice GhcPs -> R ()
8951035p_hsSplice = \case
896− HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
897− HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
898− HsQuasiQuote NoExt _ quoterName srcSpan str -> do
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
8991039 txt "["
9001040 p_rdrName (L srcSpan quoterName)
9011041 txt "|"
902− -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
903− -- any formatting here without potentially breaking someone's code.
1042+ -- QuasiQuoters often rely on precise custom strings. We cannot do any
1043+ -- formatting here without potentially breaking someone's code.
9041044 atom str
9051045 txt "|]"
9061046 HsSpliced {} -> notImplemented "HsSpliced"
907− XSplice {} -> notImplemented "XSplice"
1047+ HsSplicedT {} -> notImplemented "HsSplicedT"
1048+ XSplice x -> noExtCon x
9081049
909−p_hsSpliceTH
910− :: Bool -- ^ Typed splice?
911− -> LHsExpr GhcPs -- ^ Splice expression
912− -> SpliceDecoration -- ^ Splice decoration
913− -> R ()
1050+p_hsSpliceTH ::
1051+ -- | Typed splice?
1052+ Bool ->
1053+ -- | Splice expression
1054+ LHsExpr GhcPs ->
1055+ -- | Splice decoration
1056+ SpliceDecoration ->
1057+ R ()
9141058p_hsSpliceTH isTyped expr = \case
9151059 HasParens -> do
9161060 txt decoSymbol
917− parens (located expr (sitcc . p_hsExpr))
1061+ parens N (located expr (sitcc . p_hsExpr))
9181062 HasDollar -> do
9191063 txt decoSymbol
9201064 located expr (sitcc . p_hsExpr)
@@ -925,17 +1069,17 @@ p_hsSpliceTH isTyped expr = \case
9251069
9261070p_hsBracket :: HsBracket GhcPs -> R ()
9271071p_hsBracket = \case
928− ExpBr NoExt expr -> do
1072+ ExpBr NoExtField expr -> do
9291073 anns <- getEnclosingAnns
9301074 let name = case anns of
931− AnnOpenEQ:_ -> ""
1075+ AnnOpenEQ : _ -> ""
9321076 _ -> "e"
9331077 quote name (located expr p_hsExpr)
934− PatBr NoExt pat -> quote "p" (located pat p_pat)
935− DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
936− DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
937− TypBr NoExt ty -> quote "t" (located ty p_hsType)
938− VarBr NoExt isSingleQuote name -> do
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
9391083 txt (bool "''" "'" isSingleQuote)
9401084 -- HACK As you can see we use 'noLoc' here to be able to pass name into
9411085 -- 'p_rdrName' since the latter expects a "located" thing. The problem
@@ -943,19 +1087,20 @@ p_hsBracket = \case
9431087 -- turn makes it impossible to detect if there are parentheses around
9441088 -- it, etc. So we have to add parentheses manually assuming they are
9451089 -- necessary for all operators.
946− let isOperator = all
947− (\i -> isPunctuation i || isSymbol i)
948− (showOutputable (rdrNameOcc name))
949− && not (doesNotNeedExtraParens name)
950− wrapper = if isOperator then parens else id
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
9511096 wrapper $ p_rdrName (noLoc name)
952− TExpBr NoExt expr -> do
1097+ TExpBr NoExtField expr -> do
9531098 txt "[||"
9541099 breakpoint'
9551100 located expr p_hsExpr
9561101 breakpoint'
9571102 txt "||]"
958− XBracket {} -> notImplemented "XBracket"
1103+ XBracket x -> noExtCon x
9591104 where
9601105 quote :: Text -> R () -> R ()
9611106 quote name body = do
@@ -979,50 +1124,54 @@ p_stringLit src =
9791124 multiLine =
9801125 sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
9811126 in vlayout singleLine multiLine
982− where
983− -- Split a string on gaps (backslash delimited whitespaces)
984− --
985− -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
986− splitGaps :: String -> [String]
987− splitGaps "" = []
988− splitGaps s =
989− let -- A backslash and a whitespace starts a "gap"
990− p (Just '\\', _, _) = True
991− p (_, '\\', Just c) | ghcSpace c = False
992− p _ = True
993− in case span p (zipPrevNext s) of
994− (l, r) ->
995− let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
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 '\'
9961141 r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
997− in map orig l : splitGaps r'
998−
999− -- GHC's definition of whitespaces in strings
1000− -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1001− ghcSpace :: Char -> Bool
1002− ghcSpace c = c <= '\x7f' && is_space c
1003−
1004− -- Add backslashes to the inner side of the strings
1005− --
1006− -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1007− backslashes :: [String] -> [String]
1008− backslashes (x:y:xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1009− backslashes xs = xs
1010−
1011− -- Attaches previous and next items to each list element
1012− zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1013− zipPrevNext xs =
1014− let z = zip (zip (Nothing : map Just xs) xs)
1015− (map Just (tail xs) ++ repeat Nothing)
1016− in map (\((p, x), n) -> (p, x, n)) z
1017−
1018− orig (_, x, _) = x
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
10191162
10201163----------------------------------------------------------------------------
10211164-- Helpers
10221165
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+
10231173-- | Append each element in both lists with semigroups. If one list is shorter
10241174-- than the other, return the rest of the longer list unchanged.
1025−
10261175liftAppend :: Semigroup a => [a] -> [a] -> [a]
10271176liftAppend [] [] = []
10281177liftAppend [] (y : ys) = y : ys
@@ -1030,14 +1179,13 @@ liftAppend (x : xs) [] = x : xs
10301179liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
10311180
10321181getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1033−getGRHSSpan (GRHS NoExt guards body) =
1182+getGRHSSpan (GRHS NoExtField guards body) =
10341183 combineSrcSpans' $ getLoc body :| map getLoc guards
1035−getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1184+getGRHSSpan (XGRHS x) = noExtCon x
10361185
10371186-- | Place a thing that may have a hanging form. This function handles how
10381187-- to separate it from preceding expressions and whether to bump indentation
10391188-- depending on what sort of expression we have.
1040−
10411189placeHanging :: Placement -> R () -> R ()
10421190placeHanging placement m =
10431191 case placement of
@@ -1050,100 +1198,165 @@ placeHanging placement m =
10501198
10511199-- | Check if given block contains single expression which has a hanging
10521200-- form.
1053−
1054−blockPlacement
1055− :: (body -> Placement)
1056− -> [LGRHS GhcPs (Located body)]
1057− -> Placement
1058−blockPlacement placer [(L _ (GRHS NoExt _ (L _ x)))] = placer x
1201+blockPlacement ::
1202+ (body -> Placement) ->
1203+ [LGRHS GhcPs (Located body)] ->
1204+ Placement
1205+blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
10591206blockPlacement _ _ = Normal
10601207
10611208-- | Check if given command has a hanging form.
1062−
10631209cmdPlacement :: HsCmd GhcPs -> Placement
10641210cmdPlacement = \case
1065− HsCmdLam NoExt _ -> Hanging
1066− HsCmdCase NoExt _ _ -> Hanging
1067− HsCmdDo NoExt _ -> Hanging
1211+ HsCmdLam NoExtField _ -> Hanging
1212+ HsCmdCase NoExtField _ _ -> Hanging
1213+ HsCmdDo NoExtField _ -> Hanging
10681214 _ -> Normal
10691215
10701216cmdTopPlacement :: HsCmdTop GhcPs -> Placement
10711217cmdTopPlacement = \case
1072− HsCmdTop NoExt (L _ x) -> cmdPlacement x
1073− XCmdTop {} -> notImplemented "XCmdTop"
1218+ HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219+ XCmdTop x -> noExtCon x
10741220
10751221-- | Check if given expression has a hanging form.
1076−
10771222exprPlacement :: HsExpr GhcPs -> Placement
10781223exprPlacement = \case
10791224 -- Only hang lambdas with single line parameter lists
1080− HsLam NoExt mg -> case mg of
1081− MG _ (L _ [L _ (Match NoExt _ (x:xs) _)]) _
1082− | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs))
1083− -> Hanging
1225+ HsLam NoExtField mg -> case mg of
1226+ MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
1227+ | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
1228+ Hanging
10841229 _ -> Normal
1085− HsLamCase NoExt _ -> Hanging
1086− HsCase NoExt _ _ -> Hanging
1087− HsDo NoExt DoExpr _ -> Hanging
1088− HsDo NoExt MDoExpr _ -> Hanging
1089− RecordCon NoExt _ _ -> Hanging
1090− -- If the rightmost expression in an operator chain is hanging, make the
1091− -- whole block hanging; so that we can use the common @f = foo $ do@
1092− -- style.
1093− OpApp NoExt _ _ y -> exprPlacement (unLoc y)
1094− HsProc NoExt (L s _) _ ->
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 _ ->
10951240 -- Indentation breaks if pattern is longer than one line and left
10961241 -- hanging. Consequently, only apply hanging when it is safe.
1097− if isOneLineSpan s
1098− then Hanging
1099− else Normal
1242+ if isOneLineSpan (getLoc p)
1243+ then Hanging
1244+ else Normal
11001245 _ -> Normal
11011246
11021247withGuards :: [LGRHS GhcPs (Located body)] -> Bool
11031248withGuards = any (checkOne . unLoc)
11041249 where
11051250 checkOne :: GRHS GhcPs (Located body) -> Bool
1106− checkOne (GRHS NoExt [] _) = False
1251+ checkOne (GRHS NoExtField [] _) = False
11071252 checkOne _ = True
11081253
11091254exprOpTree :: LHsExpr GhcPs -> OpTree (LHsExpr GhcPs) (LHsExpr GhcPs)
1110−exprOpTree (L _ (OpApp NoExt x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
1255+exprOpTree (L _ (OpApp NoExtField x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
11111256exprOpTree n = OpNode n
11121257
1113−p_exprOpTree :: OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) -> R ()
1114−p_exprOpTree (OpNode x) = located x p_hsExpr
1115−p_exprOpTree (OpBranch x op y) = do
1116− -- NOTE If the beginning of the first argument and the second argument
1117− -- are on the same line, and the second argument has a hanging form, use
1118− -- hanging placement.
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.
11191276 let placement =
11201277 if isOneLineSpan
1121− (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1278+ (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
11221279 then case y of
1123− OpNode (L _ n) -> exprPlacement n
1124− _ -> Normal
1280+ OpNode (L _ n) -> exprPlacement n
1281+ _ -> Normal
11251282 else Normal
1283+ -- Distinguish holes used in infix notation.
1284+ -- eg. '1 _foo 2' and '1 `_foo` 2'
11261285 opWrapper = case unLoc op of
1127− EWildPat NoExt -> backticks
1286+ HsUnboundVar NoExtField _ -> backticks
11281287 _ -> id
1129− ub <- vlayout
1130− (return useBraces)
1131− (return $ case placement of
1132− Hanging -> useBraces
1133− Normal -> dontUseBraces)
1134− switchLayout [opTreeLoc x] $
1135− ub $ p_exprOpTree x
1136− placeHanging placement $ do
1137− located op (opWrapper . p_hsExpr)
1138− space
1139− switchLayout [opTreeLoc y] $
1140− p_exprOpTree y
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
11411342
1142−-- | Get annotations for the enclosing element.
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
11431355
1356+-- | Get annotations for the enclosing element.
11441357getEnclosingAnns :: R [AnnKeywordId]
11451358getEnclosingAnns = do
11461359 e <- getEnclosingSpan (const True)
11471360 case e of
11481361 Nothing -> return []
1149− Just e' -> getAnns (RealSrcSpan e')
1362+ Just e' -> getAnns (RealSrcSpan e')