@@ -1,33 +1,43 @@
1−{-# LANGUAGE LambdaCase #-}
1+{-# LANGUAGE LambdaCase #-}
2+{-# LANGUAGE MultiWayIf #-}
2{-# LANGUAGE OverloadedStrings #-}
3{-# LANGUAGE OverloadedStrings #-}
3−{-# LANGUAGE RecordWildCards #-}
4+{-# LANGUAGE RecordWildCards #-}
5+{-# LANGUAGE TypeApplications #-}
5module Ormolu.Printer.Meat.Declaration.Value
7module Ormolu.Printer.Meat.Declaration.Value
6− ( p_valDecl
8+ ( p_valDecl,
8− , p_hsExpr
10+ p_hsExpr,
9− , p_hsSplice
11+ p_hsSplice,
13import Bag (bagToList)
16import Bag (bagToList)
14import BasicTypes
17import BasicTypes
15import Control.Monad
18import Control.Monad
19+import Ctype (is_space)
16import Data.Bool (bool)
20import Data.Bool (bool)
21+import Data.Char (isPunctuation, isSymbol)
17import Data.Data hiding (Infix, Prefix)
22import Data.Data hiding (Infix, Prefix)
23+import Data.Functor ((<&>))
18import Data.List (intersperse, sortOn)
24import Data.List (intersperse, sortOn)
25+import Data.List.NonEmpty (NonEmpty (..), (<|))
26+import qualified Data.List.NonEmpty as NE
19import Data.Text (Text)
27import Data.Text (Text)
28+import qualified Data.Text as Text
30+import OccName (occNameString)
21import Ormolu.Printer.Combinators
31import Ormolu.Printer.Combinators
32+import Ormolu.Printer.Internal
22import Ormolu.Printer.Meat.Common
33import Ormolu.Printer.Meat.Common
34+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
23import Ormolu.Printer.Meat.Declaration.Signature
35import Ormolu.Printer.Meat.Declaration.Signature
24import Ormolu.Printer.Meat.Type
36import Ormolu.Printer.Meat.Type
37+import Ormolu.Printer.Operators
25import Ormolu.Utils
38import Ormolu.Utils
26−import Outputable (Outputable (..))
27−import SrcLoc (combineSrcSpans, isOneLineSpan)
28−import qualified Data.List.NonEmpty as NE
29−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
40+-- | Style of a group of equations.
31data MatchGroupStyle
41data MatchGroupStyle
32 = Function (Located RdrName)
42 = Function (Located RdrName)
33 | PatternBind
43 | PatternBind
@@ -35,714 +45,1062 @@ data MatchGroupStyle
36 | LambdaCase
46 | LambdaCase
48+-- | Style of equations in a group.
38data GroupStyle
49data GroupStyle
39 = EqualSign
50 = EqualSign
40 | RightArrow
51 | RightArrow
42-- | Expression placement. This marks the places where expressions that
53-- | Expression placement. This marks the places where expressions that
43-- implement handing forms may use them.
54-- implement handing forms may use them.
45data Placement
55data Placement
46− = Normal -- ^ Multi-line layout should cause
56+ = -- | Multi-line layout should cause
47− -- insertion of a newline and indentation
57+ -- insertion of a newline and indentation
49− | Hanging -- ^ Expressions that have hanging form
59+ Normal
50− -- should use it and avoid bumping one level
60+ | -- | Expressions that have hanging form
51− -- of indentation
61+ -- should use it and avoid bumping one level
53p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
66p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
54−p_valDecl = line . p_valDecl'
67+p_valDecl = \case
55−
68+ FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
56−p_valDecl' :: HsBindLR GhcPs GhcPs -> R ()
69+ PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
58− FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
59− PatBind NoExt pat grhss _ -> p_match PatternBind False [pat] grhss
60 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
70 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
61 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
71 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
62− PatSynBind NoExt psb -> p_patSynBind psb
72+ PatSynBind NoExtField psb -> p_patSynBind psb
63− XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
73+ XHsBindsLR x -> noExtCon x
65−p_funBind
75+p_funBind ::
66− :: Located RdrName
76+ Located RdrName ->
67− -> MatchGroup GhcPs (LHsExpr GhcPs)
77+ MatchGroup GhcPs (LHsExpr GhcPs) ->
69−p_funBind name mgroup =
79+p_funBind name = p_matchGroup (Function name)
70− p_matchGroup (Function name) mgroup
80+
72−p_matchGroup
82+ MatchGroupStyle ->
73− :: MatchGroupStyle
83+ MatchGroup GhcPs (LHsExpr GhcPs) ->
74− -> MatchGroup GhcPs (LHsExpr GhcPs)
84+ R ()
76p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
85p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
78−p_matchGroup'
87+p_matchGroup' ::
79− :: Data body
88+ Data body =>
80− => (body -> Placement)
89+ -- | How to get body placement
81− -> (body -> R ())
90+ (body -> Placement) ->
82− -> MatchGroupStyle
91+ -- | How to print body
83− -> MatchGroup GhcPs (Located body)
92+ (body -> R ()) ->
84− -> R ()
93+ -- | Style of this group of equations
85−p_matchGroup' placer pretty style MG {..} =
94+ MatchGroupStyle ->
86− locatedVia Nothing mg_alts $
95+ -- | Match group
87− newlineSep (located' (\m@Match {..} ->
96+ MatchGroup GhcPs (Located body) ->
88− p_match' placer pretty style (isInfixMatch m) m_pats m_grhss))
97+ R ()
89−p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
98+p_matchGroup' placer render style MG {..} = do
90−
99+ let ob = case style of
91−p_match
100+ Case -> id
92− :: MatchGroupStyle
101+ LambdaCase -> id
93− -> Bool -- ^ Is this an infix match?
102+ _ -> dontUseBraces
94− -> [LPat GhcPs]
103+ -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
95− -> GRHSs GhcPs (LHsExpr GhcPs)
104+ -- restore the brace state inside the sepsemi.
96− -> R ()
105+ ub <- bool dontUseBraces useBraces <$> canUseBraces
106+ ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
108+ p_Match m@Match {..} =
112+ (adjustMatchGroupStyle m style)
117+ p_Match (XMatch x) = noExtCon x
118+p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
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 ::
130+adjustMatchGroupStyle m = \case
131+ Function _ -> (Function . mc_fun . m_ctxt) m
134+matchStrictness :: Match id body -> SrcStrictness
135+matchStrictness match =
136+ case m_ctxt match of
137+ FunRhs {mc_strictness = s} -> s
141+ -- | Style of the group
143+ -- | Is this an infix match?
145+ -- | Strictness prefix (FunBind)
147+ -- | Argument patterns
150+ GRHSs GhcPs (LHsExpr GhcPs) ->
97p_match = p_match' exprPlacement p_hsExpr
152p_match = p_match' exprPlacement p_hsExpr
99−p_match'
154+p_match' ::
100− :: Data body
155+ Data body =>
101− => (body -> Placement)
156+ -- | How to get body placement
102− -> (body -> R ())
157+ (body -> Placement) ->
103− -> MatchGroupStyle
158+ -- | How to print body
104− -> Bool -- ^ Is this an infix match?
159+ (body -> R ()) ->
105− -> [LPat GhcPs]
160+ -- | Style of this group of equations
106− -> GRHSs GhcPs (Located body)
161+ MatchGroupStyle ->
107− -> R ()
162+ -- | Is this an infix match?
108−p_match' placer pretty style isInfix m_pats m_grhss = do
163+ Bool ->
109− -- NOTE Normally, since patterns may be placed in a multi-line layout, it
164+ -- | Strictness prefix (FunBind)
110− -- is necessary to bump indentation for the pattern group so it's more
165+ SrcStrictness ->
166+ -- | Argument patterns
169+ GRHSs GhcPs (Located body) ->
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
111 -- indented than function name. This in turn means that indentation for
174 -- indented than function name. This in turn means that indentation for
112 -- the body should also be bumped. Normally this would mean that bodies
175 -- the body should also be bumped. Normally this would mean that bodies
113 -- would start with two indentation steps applied, which is ugly, so we
176 -- would start with two indentation steps applied, which is ugly, so we
114 -- need to be a bit more clever here and bump indentation level only when
177 -- need to be a bit more clever here and bump indentation level only when
115 -- pattern group is multiline.
178 -- pattern group is multiline.
116− inci' <- case NE.nonEmpty m_pats of
179+ case strictness of
117− Nothing -> id <$ case style of
180+ NoSrcStrict -> return ()
118− Function name -> p_rdrName name
181+ SrcStrict -> txt "!"
119− _ -> return ()
182+ SrcLazy -> txt "~"
183+ indentBody <- case NE.nonEmpty m_pats of
185+ False <$ case style of
186+ Function name -> p_rdrName name
120 Just ne_pats -> do
188 Just ne_pats -> do
121− let combinedSpans = combineSrcSpans' $
189+ let combinedSpans = case style of
122− getLoc <$> ne_pats
190+ Function name -> combineSrcSpans (getLoc name) patSpans
123− inci' = if isOneLineSpan combinedSpans
191+ _ -> patSpans
124− then id
192+ patSpans = combineSrcSpans' (getLoc <$> ne_pats)
125− else inci
193+ indentBody = not (isOneLineSpan combinedSpans)
126− switchLayout combinedSpans $ do
194+ switchLayout [combinedSpans] $ do
127− let stdCase = velt' (located' p_pat <$> m_pats)
195+ let stdCase = sep breakpoint (located' p_pat) m_pats
128 case style of
196 case style of
129 Function name ->
197 Function name ->
130 p_infixDefHelper
198 p_infixDefHelper
132− inci'
200+ indentBody
133 (p_rdrName name)
201 (p_rdrName name)
134 (located' p_pat <$> m_pats)
202 (located' p_pat <$> m_pats)
135 PatternBind -> stdCase
203 PatternBind -> stdCase
136 Case -> stdCase
204 Case -> stdCase
137 Lambda -> do
205 Lambda -> do
138− case unLoc (NE.head ne_pats) of
206+ let needsSpace = case unLoc (NE.head ne_pats) of
139− LazyPat _ _ -> txt "\\ "
207+ LazyPat _ _ -> True
140− _ -> txt "\\"
208+ BangPat _ _ -> True
141− stdCase
209+ SplicePat _ _ -> True
212+ when needsSpace space
142 LambdaCase -> stdCase
214 LambdaCase -> stdCase
143− return inci'
215+ return indentBody
144−
216+ let -- Calculate position of end of patterns. This is useful when we decide
145− let
217+ -- about putting certain constructions in hanging positions.
146− -- Calculate position of end of patterns. This is useful when we decide
218+ endOfPats = case NE.nonEmpty m_pats of
147− -- about putting certain constructions in hanging positions.
219+ Nothing -> case style of
148− endOfPats = case NE.nonEmpty m_pats of
220+ Function name -> Just (getLoc name)
149− Nothing -> case style of
221+ _ -> Nothing
150− Function name -> (Just . srcSpanEnd . getLoc) name
222+ Just pats -> (Just . getLoc . NE.last) pats
151− _ -> Nothing
223+ isCase = \case
152− Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
224+ Case -> True
153− isCase = \case
225+ LambdaCase -> True
154− Case -> True
226+ _ -> False
155− LambdaCase -> True
227+ hasGuards = withGuards grhssGRHSs
156− _ -> False
228+ grhssSpan =
157− inci' $ do
229+ combineSrcSpans' $
158− let GRHSs {..} = m_grhss
159− hasGuards = withGuards grhssGRHSs
160− unless (length grhssGRHSs > 1) $ do
162− Function _ | hasGuards -> return ()
163− Function _ -> txt " ="
164− PatternBind -> txt " ="
165− s | isCase s && hasGuards -> return ()
167− let grhssSpan = combineSrcSpans' $
168 getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
230 getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
169− patGrhssSpan = maybe grhssSpan
231+ patGrhssSpan =
170− (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
232+ maybe
171− placement =
233+ grhssSpan
172− case endOfPats of
234+ (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
173− Nothing -> blockPlacement placer grhssGRHSs
235+ endOfPats
174− Just spn ->
236+ placement =
175− if isOneLineSpan
237+ case endOfPats of
176− (mkSrcSpan spn (srcSpanStart grhssSpan))
238+ Nothing -> blockPlacement placer grhssGRHSs
177− then blockPlacement placer grhssGRHSs
239+ Just spn ->
178− else Normal
240+ if onTheSameLine spn grhssSpan
179− inciLocalBinds = case placement of
241+ then blockPlacement placer grhssGRHSs
180− Normal -> id
242+ else Normal
181− Hanging -> inci
243+ p_body = do
182− p_body = do
244+ let groupStyle =
183− let groupStyle =
245+ if isCase style && hasGuards
184− if isCase style && hasGuards
185 then RightArrow
246 then RightArrow
186 else EqualSign
247 else EqualSign
187− newlineSep (located' (p_grhs' pretty groupStyle)) grhssGRHSs
248+ sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
188− unless
249+ p_where = do
189− (GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds))
250+ let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
190− (inciLocalBinds $ do
251+ unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
191− newline
252+ breakpoint
192− line (txt "where")
253+ txt "where"
193− inci (located grhssLocalBinds p_hsLocalBinds)
254+ unless whereIsEmpty breakpoint
194− )
255+ inci $ located grhssLocalBinds p_hsLocalBinds
195− case style of
256+ inciIf indentBody $ do
196− Lambda -> placeHanging placement $
257+ unless (length grhssGRHSs > 1) $
197− switchLayout patGrhssSpan p_body
258+ case style of
198− _ -> switchLayout patGrhssSpan $
259+ Function _ | hasGuards -> return ()
199− placeHanging placement p_body
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
267+p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
201p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
269p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
202−p_grhs = p_grhs' p_hsExpr
270+p_grhs = p_grhs' exprPlacement p_hsExpr
204−p_grhs'
272+p_grhs' ::
205− :: Data body
273+ Data body =>
206− => (body -> R ())
274+ -- | How to get body placement
207− -> GroupStyle
275+ (body -> Placement) ->
208− -> GRHS GhcPs (Located body)
276+ -- | How to print body
209− -> R ()
277+ (body -> R ()) ->
210−p_grhs' pretty style (GRHS NoExt guards body) =
278+ GroupStyle ->
279+ GRHS GhcPs (Located body) ->
281+p_grhs' placer render style (GRHS NoExtField guards body) =
211 case guards of
282 case guards of
212 [] -> p_body
283 [] -> p_body
214− txt "| "
285+ txt "|"
215− velt $ withSep comma (located' p_stmt) xs
217− txt $ case style of
287+ sitcc (sep commaDel (sitcc . located' p_stmt) xs)
218− EqualSign -> "="
288+ space
219− RightArrow -> "->"
289+ inci $ case style of
220− breakpoint
290+ EqualSign -> equals
221− inci p_body
291+ RightArrow -> txt "->"
292+ placeHanging placement p_body
223− p_body = located body pretty
294+ placement =
224−p_grhs' _ _ (XGRHS NoExt) = notImplemented "XGRHS"
295+ case endOfGuards of
296+ Nothing -> placer (unLoc body)
298+ if onTheSameLine spn (getLoc body)
299+ then placer (unLoc body)
302+ case NE.nonEmpty guards of
304+ Just gs -> (Just . getLoc . NE.last) gs
305+ p_body = located body render
306+p_grhs' _ _ _ (XGRHS x) = noExtCon x
226p_hsCmd :: HsCmd GhcPs -> R ()
308p_hsCmd :: HsCmd GhcPs -> R ()
227p_hsCmd = \case
309p_hsCmd = \case
228− HsCmdArrApp NoExt body input arrType _ -> do
310+ HsCmdArrApp NoExtField body input arrType _ -> do
229 located body p_hsExpr
311 located body p_hsExpr
230− txt $ case arrType of
312+ breakpoint
231− HsFirstOrderApp -> " -<"
313+ inci $ do
232− HsHigherOrderApp -> " -<<"
314+ case arrType of
233− placeHanging (exprPlacement (unLoc input)) $
315+ HsFirstOrderApp -> txt "-<"
234− located input p_hsExpr
316+ HsHigherOrderApp -> txt "-<<"
235− HsCmdArrForm NoExt form Prefix _ cmds -> banana $ sitcc $ do
317+ placeHanging (exprPlacement (unLoc input)) $
318+ located input p_hsExpr
319+ HsCmdArrForm NoExtField form Prefix _ cmds -> banana $ do
236 located form p_hsExpr
320 located form p_hsExpr
237− unless (null cmds) $ do
321+ unless (null cmds) $ do
238 breakpoint
322 breakpoint
239 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
323 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
240− HsCmdArrForm NoExt form Infix _ [left, right] -> do
324+ HsCmdArrForm NoExtField form Infix _ [left, right] -> do
241 located left p_hsCmdTop
325 located left p_hsCmdTop
243 located form p_hsExpr
327 located form p_hsExpr
244 placeHanging (cmdTopPlacement (unLoc right)) $
328 placeHanging (cmdTopPlacement (unLoc right)) $
245 located right p_hsCmdTop
329 located right p_hsCmdTop
246− HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
330+ HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
247 HsCmdApp {} ->
331 HsCmdApp {} ->
248 -- XXX Does this ever occur in the syntax tree? It does not seem like it
332 -- XXX Does this ever occur in the syntax tree? It does not seem like it
249 -- does. Open an issue and ping @yumiova if this ever occurs in output.
333 -- does. Open an issue and ping @yumiova if this ever occurs in output.
250 notImplemented "HsCmdApp"
334 notImplemented "HsCmdApp"
251− HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
335+ HsCmdLam NoExtField mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
252− HsCmdPar NoExt c -> parens (located c p_hsCmd)
336+ HsCmdPar NoExtField c -> parens N (located c p_hsCmd)
253− HsCmdCase NoExt e mgroup -> do
337+ HsCmdCase NoExtField e mgroup ->
254− txt "case "
338+ p_case cmdPlacement p_hsCmd e mgroup
255− located e p_hsExpr
339+ HsCmdIf NoExtField _ if' then' else' ->
256− txt " of"
340+ p_if cmdPlacement p_hsCmd if' then' else'
257− breakpoint
341+ HsCmdLet NoExtField localBinds c ->
258− inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
342+ p_let p_hsCmd localBinds c
259− HsCmdIf NoExt _ if' then' else' -> do
343+ HsCmdDo NoExtField es -> do
261− located if' p_hsExpr
264− located then' $ \x -> do
269− located else' $ \x -> do
272− HsCmdLet NoExt localBinds c -> do
274− sitcc (located localBinds p_hsLocalBinds)
277− sitcc (located c p_hsCmd)
278− HsCmdDo NoExt es -> do
281− inci (located es (newlineSep (located' (sitcc . p_stmt' p_hsCmd))))
346+ inci . located es $
347+ sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
282 HsCmdWrap {} -> notImplemented "HsCmdWrap"
348 HsCmdWrap {} -> notImplemented "HsCmdWrap"
283− XCmd {} -> notImplemented "XCmd"
349+ XCmd x -> noExtCon x
285p_hsCmdTop :: HsCmdTop GhcPs -> R ()
351p_hsCmdTop :: HsCmdTop GhcPs -> R ()
286p_hsCmdTop = \case
352p_hsCmdTop = \case
287− HsCmdTop NoExt cmd -> located cmd p_hsCmd
353+ HsCmdTop NoExtField cmd -> located cmd p_hsCmd
288− XCmdTop {} -> notImplemented "XHsCmdTop"
354+ XCmdTop x -> noExtCon x
356+-- | Render an expression preserving blank lines between such consecutive
357+-- expressions found in the original source code.
359+ -- | Rendering function
361+ -- | Entity to render
364+withSpacing f l = located l $ \x -> do
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
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)
290p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
385p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
291−p_stmt = p_stmt' p_hsExpr
386+p_stmt = p_stmt' exprPlacement p_hsExpr
293−p_stmt'
388+p_stmt' ::
294− :: Data body
389+ Data body =>
295− => (body -> R ())
390+ -- | Placer
296− -> Stmt GhcPs (Located body)
391+ (body -> Placement) ->
297− -> R ()
392+ -- | Render
298−p_stmt' pretty = \case
393+ (body -> R ()) ->
299− LastStmt NoExt body _ _ -> located body pretty
394+ -- | Statement to render
300− BindStmt NoExt l f _ _ -> do
395+ Stmt GhcPs (Located body) ->
301− located l p_pat
396+ R ()
397+p_stmt' placer render = \case
398+ LastStmt NoExtField body _ _ -> located body render
399+ BindStmt NoExtField p f _ _ -> do
304− breakpoint
403+ let loc = getLoc p
305− inci (located f pretty)
404+ placement =
306− ApplicativeStmt {} -> notImplemented "ApplicativeStmt"
405+ case f of
307− BodyStmt NoExt body _ _ -> located body pretty
406+ L l' x ->
308− LetStmt NoExt binds -> do
407+ if isOneLineSpan
309− txt "let "
408+ (mkSrcSpan (srcSpanEnd loc) (srcSpanStart l'))
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
310 sitcc $ located binds p_hsLocalBinds
418 sitcc $ located binds p_hsLocalBinds
311− ParStmt NoExt stmts _ _ ->
419+ ParStmt {} ->
312− sequence_ $ intersperse breakpoint $
420+ -- 'ParStmt' should always be eliminated in 'gatherStmt' already, such
313− withSep (txt "| ") p_parStmtBlock stmts
421+ -- that it never occurs in 'p_stmt''. Consequently, handling it here
314− TransStmt {} -> notImplemented "TransStmt"
422+ -- would be redundant.
423+ notImplemented "ParStmt"
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
432+ inci $ located trS_using p_hsExpr
433+ (ThenForm, Just e) -> do
436+ inci $ located trS_using p_hsExpr
440+ inci $ located e p_hsExpr
441+ (GroupForm, Nothing) -> do
442+ txt "then group using"
444+ inci $ located trS_using p_hsExpr
445+ (GroupForm, Just e) -> do
448+ inci $ located e p_hsExpr
452+ inci $ located trS_using p_hsExpr
315 RecStmt {..} -> do
453 RecStmt {..} -> do
316− txt "rec "
454+ txt "rec"
317− sitcc $ newlineSep (located' (p_stmt' pretty)) recS_stmts
455+ space
318− XStmtLR {} -> notImplemented "XStmtLR"
456+ sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457+ XStmtLR c -> noExtCon c
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]]
320−p_parStmtBlock :: ParStmtBlock GhcPs GhcPs -> R ()
466+gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
321−p_parStmtBlock = \case
467+gatherStmtBlock (ParStmtBlock _ stmts _ _) =
322− ParStmtBlock NoExt stmts _ _ ->
468+ foldr (liftAppend . gatherStmt) [] stmts
323− velt $ withSep comma (located' (sitcc . p_stmt)) stmts
469+gatherStmtBlock (XParStmtBlock x) = noExtCon x
324− XParStmtBlock {} -> notImplemented "XParStmtBlock"
326p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
471p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
327p_hsLocalBinds = \case
472p_hsLocalBinds = \case
328− HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
473+ HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
329− let ssStart = either
474+ -- When in a single-line layout, there is a chance that the inner
330− (srcSpanStart . getLoc)
475+ -- elements will also contain semicolons and they will confuse the
331− (srcSpanStart . getLoc)
476+ -- parser. so we request braces around every element except the last.
332− items =
477+ br <- layoutToBraces <$> getLayout
333− (Left <$> bagToList bag) ++ (Right <$> lsigs)
478+ let items =
334− p_item (Left x) = located x p_valDecl'
479+ let injectLeft (L l x) = L l (Left x)
335− p_item (Right x) = located x p_sigDecl'
480+ injectRight (L l x) = L l (Right x)
336− newlineSep p_item (sortOn ssStart items)
481+ in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
337− HsValBinds NoExt _ -> notImplemented "HsValBinds"
482+ positionToBracing = \case
338− HsIPBinds NoExt _ -> notImplemented "HsIPBinds"
483+ SinglePos -> id
339− EmptyLocalBinds NoExt -> return ()
484+ FirstPos -> br
340− XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
485+ MiddlePos -> br
342−p_hsRecField
487+ p_item' (p, item) =
343− :: (Data id, Outputable id)
488+ positionToBracing p $
344− => HsRecField' id (LHsExpr GhcPs)
489+ withSpacing (either p_valDecl p_sigDecl) item
345− -> R ()
490+ binds = sortOn (srcSpanStart . getLoc) items
346−p_hsRecField = \HsRecField {..} -> do
491+ sitcc $ sepSemi p_item' (attachRelativePos binds)
347− located hsRecFieldLbl atom
492+ HsValBinds NoExtField _ -> notImplemented "HsValBinds"
348− unless hsRecPun $ do
493+ HsIPBinds NoExtField (IPBinds NoExtField xs) ->
349− txt " = "
494+ -- Second argument of IPBind is always Left before type-checking.
350− located hsRecFieldArg p_hsExpr
495+ let p_ipBind (IPBind NoExtField (Left name) expr) = do
352−p_hsTupArg :: HsTupArg GhcPs -> R ()
497+ space
353−p_hsTupArg = \case
498+ equals
354− Present NoExt x -> located x p_hsExpr
499+ breakpoint
355− Missing NoExt -> pure ()
500+ useBraces $ inci $ located expr p_hsExpr
356− XTupArg {} -> notImplemented "XTupArg"
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
511+ HsRecField' RdrName (LHsExpr GhcPs) ->
513+p_hsRecField HsRecField {..} = do
514+ p_rdrName hsRecFieldLbl
515+ unless hsRecPun $ do
519+ if onTheSameLine (getLoc hsRecFieldLbl) (getLoc hsRecFieldArg)
520+ then exprPlacement (unLoc hsRecFieldArg)
522+ placeHanging placement (located hsRecFieldArg p_hsExpr)
358p_hsExpr :: HsExpr GhcPs -> R ()
524p_hsExpr :: HsExpr GhcPs -> R ()
359−p_hsExpr = \case
525+p_hsExpr = p_hsExpr' N
360− HsVar NoExt name -> p_rdrName name
526+
361− HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
527+p_hsExpr' :: BracketStyle -> HsExpr GhcPs -> R ()
362− HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
528+p_hsExpr' s = \case
363− HsRecFld NoExt x ->
529+ HsVar NoExtField name -> p_rdrName name
530+ HsUnboundVar NoExtField v -> atom (unboundVarOcc v)
531+ HsConLikeOut NoExtField _ -> notImplemented "HsConLikeOut"
532+ HsRecFld NoExtField x ->
364 case x of
533 case x of
365− Unambiguous NoExt name -> p_rdrName name
534+ Unambiguous NoExtField name -> p_rdrName name
366− Ambiguous NoExt name -> p_rdrName name
535+ Ambiguous NoExtField name -> p_rdrName name
367− XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
536+ XAmbiguousFieldOcc xx -> noExtCon xx
368− HsOverLabel NoExt _ v -> do
537+ HsOverLabel NoExtField _ v -> do
371− HsIPVar NoExt (HsIPName name) -> do
540+ HsIPVar NoExtField (HsIPName name) -> do
373 atom name
542 atom name
374− HsOverLit NoExt v -> atom (ol_val v)
543+ HsOverLit NoExtField v -> atom (ol_val v)
375− HsLit NoExt lit -> atom lit
544+ HsLit NoExtField lit ->
376− HsLam NoExt mgroup ->
545+ case lit of
546+ HsString (SourceText stxt) _ -> p_stringLit stxt
547+ HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
549+ HsLam NoExtField mgroup ->
377 p_matchGroup Lambda mgroup
550 p_matchGroup Lambda mgroup
378− HsLamCase NoExt mgroup -> do
551+ HsLamCase NoExtField mgroup -> do
379 txt "\\case"
552 txt "\\case"
381− inci (p_matchGroup LambdaCase mgroup)
382− HsApp NoExt f x -> do
384 breakpoint
553 breakpoint
385− inci (located x p_hsExpr)
554+ inci (p_matchGroup LambdaCase mgroup)
386− 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 =
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)
569+ getLoc f :| [(srcLocSpan . srcSpanStart . getLoc) lastp]
570+ -- Hang the last argument only if the initial arguments span one
573+ if isOneLineSpan initSpan
574+ then exprPlacement (unLoc lastp)
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
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.
589+ L _ (HsPar NoExtField _) -> True
590+ L _ (HsAppType NoExtField _ _) -> True
591+ L _ (HsMultiIf NoExtField _) -> True
592+ L spn _ -> isOneLineSpan spn
595+ SingleLine -> useBraces
598+ located func (p_hsExpr' s)
600+ inciIf doIndent $ sep breakpoint (located' p_hsExpr) initp
601+ inciIf doIndent $ do
602+ unless (null initp) breakpoint
603+ located lastp p_hsExpr
605+ useBraces . switchLayout [initSpan] $ do
606+ located func (p_hsExpr' s)
608+ sep breakpoint (located' p_hsExpr) initp
609+ placeHanging placement $
610+ located lastp p_hsExpr
611+ HsAppType NoExtField e a -> do
387 located e p_hsExpr
612 located e p_hsExpr
388 breakpoint
613 breakpoint
389 inci $ do
614 inci $ do
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
391 located (hswc_body a) p_hsType
621 located (hswc_body a) p_hsType
392− OpApp NoExt x op y -> do
622+ OpApp NoExtField x op y -> do
393− located x p_hsExpr
623+ let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
394− space
624+ p_exprOpTree s (reassociateOpTree getOpName opTree)
395− located op p_hsExpr
625+ NegApp NoExtField e _ -> do
396− placeHanging (exprPlacement (unLoc y)) $
398− NegApp NoExt e _ -> do
400 located e p_hsExpr
628 located e p_hsExpr
401− HsPar NoExt e -> parens (located e p_hsExpr)
629+ HsPar NoExtField e ->
402− SectionL NoExt x op -> do
630+ parens s (located e (dontUseBraces . p_hsExpr))
631+ SectionL NoExtField x op -> do
403 located x p_hsExpr
632 located x p_hsExpr
404 breakpoint
633 breakpoint
405 inci (located op p_hsExpr)
634 inci (located op p_hsExpr)
406− SectionR NoExt op x -> do
635+ SectionR NoExtField op x -> do
407 located op p_hsExpr
636 located op p_hsExpr
408− breakpoint
637+ useRecordDot' <- useRecordDot
638+ let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639+ unless (useRecordDot' && isRecordDot') breakpoint
409 inci (located x p_hsExpr)
640 inci (located x p_hsExpr)
410− ExplicitTuple NoExt args boxity -> do
641+ ExplicitTuple NoExtField args boxity ->
411 let isSection = any (isMissing . unLoc) args
642 let isSection = any (isMissing . unLoc) args
412 isMissing = \case
643 isMissing = \case
413− Missing NoExt -> True
644+ Missing NoExtField -> True
414 _ -> False
645 _ -> False
415− 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
416 case boxity of
652 case boxity of
417 Boxed -> parens
653 Boxed -> parens
418 Unboxed -> parensHash
654 Unboxed -> parensHash
419− parens' $ if isSection
655+ in if isSection
420− then sequence_ (withSep (txt ",") (located' p_hsTupArg) args)
656+ then
421− else velt (withSep comma (located' p_hsTupArg) args)
657+ switchLayout [] . parens' s $
422− ExplicitSum NoExt tag arity e -> do
658+ sep comma p_larg args
423− let before = tag - 1
659+ else
424− after = arity - before - 1
660+ switchLayout (getLoc <$> args) . parens' s $
425− args = replicate before Nothing <> [Just e] <> replicate after Nothing
661+ sep commaDel p_larg args
426− f (x,i) = do
662+ ExplicitSum NoExtField tag arity e ->
427− let isFirst = i == 0
663+ p_unboxedSum N tag arity (located e p_hsExpr)
428− isLast = i == arity - 1
664+ HsCase NoExtField e mgroup ->
429− case x of
665+ p_case exprPlacement p_hsExpr e mgroup
430− Nothing ->
666+ HsIf NoExtField _ if' then' else' ->
431− unless (isFirst || isLast) space
667+ p_if exprPlacement p_hsExpr if' then' else'
432− Just l -> do
668+ HsMultiIf NoExtField guards -> do
433− unless isFirst space
669+ txt "if"
436− parensHash $ sequence_ (withSep (txt "|") f (zip args [0..]))
437− HsCase NoExt e mgroup -> do
441 breakpoint
670 breakpoint
442− inci (p_matchGroup Case mgroup)
671+ inci . inci $ sep newline (located' (p_grhs RightArrow)) guards
443− HsIf NoExt _ if' then' else' -> do
672+ HsLet NoExtField localBinds e ->
444− txt "if "
673+ p_let p_hsExpr localBinds e
445− located if' p_hsExpr
674+ HsDo NoExtField ctx es -> do
448− located then' $ \x -> do
453− located else' $ \x -> do
456− HsMultiIf NoExt guards -> do
458− sitcc $ newlineSep (located' (p_grhs RightArrow)) guards
459− HsLet NoExt localBinds e -> do
461− sitcc (located localBinds p_hsLocalBinds)
462− vlayout space (newline >> space)
464− sitcc (located e p_hsExpr)
465− HsDo NoExt ctx es -> do
466 let doBody header = do
675 let doBody header = do
467 txt header
676 txt header
468− newline
677+ breakpoint
469− inci $ located es (newlineSep (located' (sitcc . p_stmt)))
678+ ub <- layoutToBraces <$> getLayout
470− compBody = brackets $ located es $ \xs -> do
679+ inci $
471− let stmts = init xs
680+ sepSemi
681+ (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
683+ compBody = brackets N . located es $ \xs -> do
686+ (breakpoint >> txt "|" >> space)
692+ (located' (sitcc . p_stmt))
472 yield = last xs
694 yield = last xs
695+ lists = foldr (liftAppend . gatherStmt) [] stmts
473 located yield p_stmt
696 located yield p_stmt
474 breakpoint
697 breakpoint
475− txt "| "
698+ txt "|"
476− case stmts of
699+ space
477− [stmt] | ParStmt {} <- unLoc stmt -> located stmt p_stmt
700+ p_parBody lists
478− _ -> velt $ withSep comma (located' (sitcc . p_stmt)) stmts
479 case ctx of
701 case ctx of
480 DoExpr -> doBody "do"
702 DoExpr -> doBody "do"
481 MDoExpr -> doBody "mdo"
703 MDoExpr -> doBody "mdo"
482 ListComp -> compBody
704 ListComp -> compBody
483 MonadComp -> notImplemented "MonadComp"
705 MonadComp -> notImplemented "MonadComp"
484− ArrowExpr -> notImplemented "ArrowExpr"
706+ ArrowExpr -> notImplemented "ArrowExpr"
485 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
707 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
486 PatGuard _ -> notImplemented "PatGuard"
708 PatGuard _ -> notImplemented "PatGuard"
487 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
709 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
488 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
710 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
489 ExplicitList _ _ xs ->
711 ExplicitList _ _ xs ->
490− brackets $ velt (withSep comma (located' p_hsExpr) xs)
712+ brackets s $
713+ sep commaDel (sitcc . located' p_hsExpr) xs
491 RecordCon {..} -> do
714 RecordCon {..} -> do
492 located rcon_con_name atom
715 located rcon_con_name atom
493 breakpoint
716 breakpoint
494 let HsRecFields {..} = rcon_flds
717 let HsRecFields {..} = rcon_flds
495− fields = located' p_hsRecField <$> rec_flds
718+ updName f =
719+ (f :: HsRecField GhcPs (LHsExpr GhcPs))
720+ { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
722+ XFieldOcc x -> noExtCon x
724+ fields = located' (p_hsRecField . updName) <$> rec_flds
497 case rec_dotdot of
726 case rec_dotdot of
498 Just {} -> [txt ".."]
727 Just {} -> [txt ".."]
499 Nothing -> []
728 Nothing -> []
500− inci $ braces $ velt (withSep comma id (fields <> dotdot))
729+ inci . braces N $
730+ sep commaDel sitcc (fields <> dotdot)
501 RecordUpd {..} -> do
731 RecordUpd {..} -> do
502 located rupd_expr p_hsExpr
732 located rupd_expr p_hsExpr
503− breakpoint
733+ useRecordDot' <- useRecordDot
504− inci $ braces $ velt (withSep comma (located' p_hsRecField) rupd_flds)
734+ let mrs sp = case getLoc sp of
505− ExprWithTySig affix x -> sitcc $ do
735+ RealSrcSpan r -> Just r
738+ ((1 +) . srcSpanEndCol <$> mrs rupd_expr)
739+ == (srcSpanStartCol <$> mrs (head rupd_flds))
740+ unless (useRecordDot' && isPluginForm) breakpoint
742+ (f :: HsRecUpdField GhcPs)
743+ { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
745+ Unambiguous _ n -> n
746+ XAmbiguousFieldOcc x -> noExtCon x
751+ (sitcc . located' (p_hsRecField . updName))
753+ ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
506 located x p_hsExpr
754 located x p_hsExpr
507 breakpoint
757 breakpoint
508− inci $ do
758+ inci $ located hsib_body p_hsType
509− txt ":: "
759+ ExprWithTySig NoExtField _ HsWC {hswc_body = XHsImplicitBndrs x} -> noExtCon x
510− let HsWC {..} = affix
760+ ExprWithTySig NoExtField _ (XHsWildCardBndrs x) -> noExtCon x
511− HsIB {..} = hswc_body
761+ ArithSeq NoExtField _ x ->
512− located hsib_body p_hsType
513− ArithSeq NoExt _ x -> do
514 case x of
762 case x of
515− From from -> brackets $ do
763+ From from -> brackets s $ do
516 located from p_hsExpr
764 located from p_hsExpr
517− breakpoint'
765+ breakpoint
519− FromThen from next -> brackets $ do
767+ FromThen from next -> brackets s $ do
520− velt (withSep comma (located' p_hsExpr) [from, next])
768+ sep commaDel (located' p_hsExpr) [from, next]
521− breakpoint'
769+ breakpoint
523− FromTo from to -> brackets $ do
771+ FromTo from to -> brackets s $ do
524 located from p_hsExpr
772 located from p_hsExpr
525− breakpoint'
773+ breakpoint
526− txt ".. "
774+ txt ".."
527 located to p_hsExpr
776 located to p_hsExpr
528− FromThenTo from next to -> brackets $ do
777+ FromThenTo from next to -> brackets s $ do
529− velt (withSep comma (located' p_hsExpr) [from, next])
778+ sep commaDel (located' p_hsExpr) [from, next]
530− breakpoint'
779+ breakpoint
531− txt ".. "
780+ txt ".."
532 located to p_hsExpr
782 located to p_hsExpr
533− HsSCC NoExt _ name x -> do
783+ HsSCC NoExtField _ name x -> do
534 txt "{-# SCC "
784 txt "{-# SCC "
535 atom name
785 atom name
536 txt " #-}"
786 txt " #-}"
537 breakpoint
787 breakpoint
538 located x p_hsExpr
788 located x p_hsExpr
539− HsCoreAnn NoExt _ value x -> do
789+ HsCoreAnn NoExtField _ value x -> do
540 txt "{-# CORE "
790 txt "{-# CORE "
541 atom value
791 atom value
542 txt " #-}"
792 txt " #-}"
543 breakpoint
793 breakpoint
544 located x p_hsExpr
794 located x p_hsExpr
545− HsBracket NoExt x -> p_hsBracket x
795+ HsBracket NoExtField x -> p_hsBracket x
546 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
796 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
547 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
797 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
548− HsSpliceE NoExt splice -> p_hsSplice splice
798+ HsSpliceE NoExtField splice -> p_hsSplice splice
549− HsProc NoExt p e -> do
799+ HsProc NoExtField p e -> do
550 txt "proc"
800 txt "proc"
551− located p $ \x -> do
801+ located p $ \x -> do
552 breakpoint
802 breakpoint
553 inci (p_pat x)
803 inci (p_pat x)
554 breakpoint
804 breakpoint
556− placeHanging (cmdTopPlacement (unLoc e)) (located e p_hsCmdTop)
806+ placeHanging (cmdTopPlacement (unLoc e)) $
557− HsStatic _ e -> do
807+ located e p_hsCmdTop
558 txt "static"
809 txt "static"
559 breakpoint
810 breakpoint
560 inci (located e p_hsExpr)
811 inci (located e p_hsExpr)
561− HsArrApp NoExt body input arrType cond ->
562− p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
563− HsArrForm NoExt form mfixity cmds ->
564− p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
565 HsTick {} -> notImplemented "HsTick"
812 HsTick {} -> notImplemented "HsTick"
566 HsBinTick {} -> notImplemented "HsBinTick"
813 HsBinTick {} -> notImplemented "HsBinTick"
567 HsTickPragma {} -> notImplemented "HsTickPragma"
814 HsTickPragma {} -> notImplemented "HsTickPragma"
568− EWildPat NoExt -> txt "_"
569− EAsPat {} -> notImplemented "EAsPat"
570− EViewPat {} -> notImplemented "EViewPat"
571− ELazyPat {} -> notImplemented "ELazyPat"
572 HsWrap {} -> notImplemented "HsWrap"
815 HsWrap {} -> notImplemented "HsWrap"
573− XExpr {} -> notImplemented "XExpr"
816+ XExpr x -> noExtCon x
575p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
818p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
576p_patSynBind PSB {..} = do
819p_patSynBind PSB {..} = do
577− txt "pattern "
820+ let rhs = do
578− let nonEmptySynDetails = \case
821+ space
579− PrefixCon (_:_) -> True
822+ case psb_dir of
580− RecCon (_:_) -> True
823+ Unidirectional -> do
581− _ -> False
824+ txt "<-"
582− case psb_dir of
825+ breakpoint
583− Unidirectional -> do
826+ located psb_def p_pat
584− p_rdrName psb_id
827+ ImplicitBidirectional -> do
585− when (nonEmptySynDetails psb_args) space
828+ equals
586− p_patSynDetails psb_args
829+ breakpoint
587− txt " <-"
830+ located psb_def p_pat
588− breakpoint
831+ ExplicitBidirectional mgroup -> do
589− inci (located psb_def p_pat)
832+ txt "<-"
590− ImplicitBidirectional -> do
833+ breakpoint
834+ located psb_def p_pat
838+ inci (p_matchGroup (Function psb_id) mgroup)
591 p_rdrName psb_id
843 p_rdrName psb_id
592− when (nonEmptySynDetails psb_args) space
844+ inci $ do
593− p_patSynDetails psb_args
845+ switchLayout (getLoc <$> xs) $ do
594− txt " ="
846+ unless (null xs) breakpoint
595− breakpoint
847+ sitcc (sep breakpoint p_rdrName xs)
596− inci (located psb_def p_pat)
848+ rhs
597− ExplicitBidirectional mgroup -> do
849+ RecCon xs -> do
598 p_rdrName psb_id
851 p_rdrName psb_id
599− when (nonEmptySynDetails psb_args) space
600− p_patSynDetails psb_args
603− inci (located psb_def p_pat)
605 inci $ do
852 inci $ do
606− line (txt "where")
853+ switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
607− inci (p_matchGroup (Function psb_id) mgroup)
854+ unless (null xs) breakpoint
608−p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
855+ braces N $
609−
856+ sep commaDel (p_rdrName . recordPatSynPatVar) xs
610−p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
857+ rhs
611−p_patSynDetails = \case
858+ InfixCon l r -> do
612− PrefixCon xs ->
859+ switchLayout [getLoc l, getLoc r] $ do
613− velt' (p_rdrName <$> xs)
860+ space
614− RecCon xs ->
861+ p_rdrName l
615− velt' (p_rdrName . recordPatSynPatVar <$> xs)
862+ breakpoint
616− InfixCon _ _ -> notImplemented "InfixCon"
863+ inci $ do
868+p_patSynBind (XPatSynBind x) = noExtCon x
873+ (body -> Placement) ->
879+ MatchGroup GhcPs (Located body) ->
881+p_case placer render e mgroup = do
888+ inci (p_matchGroup' placer render Case mgroup)
893+ (body -> Placement) ->
903+p_if placer render if' then' else' = do
906+ located if' p_hsExpr
911+ located then' $ \x ->
912+ placeHanging (placer x) (render x)
916+ located else' $ \x ->
917+ placeHanging (placer x) (render x)
923+ Located (HsLocalBindsLR GhcPs GhcPs) ->
926+p_let render localBinds e = sitcc $ do
929+ dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
930+ vlayout space (newline >> txt " ")
933+ sitcc (located e render)
618p_pat :: Pat GhcPs -> R ()
935p_pat :: Pat GhcPs -> R ()
619p_pat = \case
936p_pat = \case
620− WildPat NoExt -> txt "_"
937+ WildPat NoExtField -> txt "_"
621− VarPat NoExt name -> p_rdrName name
938+ VarPat NoExtField name -> p_rdrName name
622− LazyPat NoExt pat -> do
939+ LazyPat NoExtField pat -> do
624 located pat p_pat
941 located pat p_pat
625− AsPat NoExt name pat -> do
942+ AsPat NoExtField name pat -> do
626 p_rdrName name
943 p_rdrName name
628 located pat p_pat
945 located pat p_pat
629− ParPat NoExt pat ->
946+ ParPat NoExtField pat ->
630− located pat (parens . p_pat)
947+ located pat (parens S . p_pat)
631− BangPat NoExt pat -> do
948+ BangPat NoExtField pat -> do
633 located pat p_pat
950 located pat p_pat
634− ListPat NoExt pats -> do
951+ ListPat NoExtField pats ->
635− brackets $ velt (withSep comma (located' p_pat) pats)
952+ brackets S $ sep commaDel (located' p_pat) pats
636− TuplePat NoExt pats boxing -> do
953+ TuplePat NoExtField pats boxing -> do
637− let f =
954+ let parens' =
638 case boxing of
955 case boxing of
639− Boxed -> parens
956+ Boxed -> parens S
640− Unboxed -> parensHash
957+ Unboxed -> parensHash S
641− f $ velt (withSep comma (located' p_pat) pats)
958+ parens' $ sep commaDel (sitcc . located' p_pat) pats
642− SumPat NoExt pat _ _ -> do
959+ SumPat NoExtField pat tag arity ->
643− -- XXX I'm not sure about this one.
960+ p_unboxedSum S tag arity (located pat p_pat)
645 ConPatIn pat details ->
961 ConPatIn pat details ->
646 case details of
962 case details of
647 PrefixCon xs -> sitcc $ do
963 PrefixCon xs -> sitcc $ do
648 p_rdrName pat
964 p_rdrName pat
649 unless (null xs) $ do
965 unless (null xs) $ do
650 breakpoint
966 breakpoint
651− inci $ velt' (located' p_pat <$> xs)
967+ inci . sitcc $ sep breakpoint (sitcc . located' p_pat) xs
652 RecCon (HsRecFields fields dotdot) -> do
968 RecCon (HsRecFields fields dotdot) -> do
653 p_rdrName pat
969 p_rdrName pat
654 breakpoint
970 breakpoint
655 let f = \case
971 let f = \case
656 Nothing -> txt ".."
972 Nothing -> txt ".."
657 Just x -> located x p_pat_hsRecField
973 Just x -> located x p_pat_hsRecField
658− inci . braces . velt . withSep comma f $ case dotdot of
974+ inci . braces N . sep commaDel f $
659− Nothing -> Just <$> fields
975+ case dotdot of
660− Just n -> (Just <$> take n fields) ++ [Nothing]
976+ Nothing -> Just <$> fields
661− InfixCon x y -> do
977+ Just (L _ n) -> (Just <$> take n fields) ++ [Nothing]
662− located x p_pat
978+ InfixCon l r -> do
663− space
979+ switchLayout [getLoc l, getLoc r] $ do
664− p_rdrName pat
980+ located l p_pat
665− breakpoint
981+ breakpoint
666− inci (located y p_pat)
982+ inci $ do
667 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
986 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
668− ViewPat NoExt expr pat -> sitcc $ do
987+ ViewPat NoExtField expr pat -> sitcc $ do
669 located expr p_hsExpr
988 located expr p_hsExpr
671 breakpoint
991 breakpoint
672 inci (located pat p_pat)
992 inci (located pat p_pat)
673− SplicePat NoExt splice -> p_hsSplice splice
993+ SplicePat NoExtField splice -> p_hsSplice splice
674− LitPat NoExt p -> atom p
994+ LitPat NoExtField p -> atom p
675− NPat NoExt v _ _ -> located v (atom . ol_val)
995+ NPat NoExtField v _ _ -> located v (atom . ol_val)
676− NPlusKPat NoExt n k _ _ _ -> sitcc $ do
996+ NPlusKPat NoExtField n k _ _ _ -> sitcc $ do
677 p_rdrName n
997 p_rdrName n
678 breakpoint
998 breakpoint
679 inci $ do
999 inci $ do
680− txt "+ "
1000+ txt "+"
681 located k (atom . ol_val)
1002 located k (atom . ol_val)
682− SigPat hswc pat -> do
1003+ SigPat NoExtField pat hswc -> do
683 located pat p_pat
1004 located pat p_pat
684 p_typeAscription hswc
1005 p_typeAscription hswc
685 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
1006 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
686− XPat NoExt -> notImplemented "XPat"
1007+ XPat x -> noExtCon x
688p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1009p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
689p_pat_hsRecField HsRecField {..} = do
1010p_pat_hsRecField HsRecField {..} = do
690 located hsRecFieldLbl $ \x ->
1011 located hsRecFieldLbl $ \x ->
691 p_rdrName (rdrNameFieldOcc x)
1012 p_rdrName (rdrNameFieldOcc x)
692 unless hsRecPun $ do
1013 unless hsRecPun $ do
694 breakpoint
1016 breakpoint
695 inci (located hsRecFieldArg p_pat)
1017 inci (located hsRecFieldArg p_pat)
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
1025+ case x :: Maybe (R ()) of
1032+ parensHash s $ sep (txt "|") f args
697p_hsSplice :: HsSplice GhcPs -> R ()
1034p_hsSplice :: HsSplice GhcPs -> R ()
698p_hsSplice = \case
1035p_hsSplice = \case
699− HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
1036+ HsTypedSplice NoExtField deco _ expr -> p_hsSpliceTH True expr deco
700− HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
1037+ HsUntypedSplice NoExtField deco _ expr -> p_hsSpliceTH False expr deco
701− HsQuasiQuote NoExt _ quoterName srcSpan str -> do
1038+ HsQuasiQuote NoExtField _ quoterName srcSpan str -> do
703 p_rdrName (L srcSpan quoterName)
1040 p_rdrName (L srcSpan quoterName)
705− -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
1042+ -- QuasiQuoters often rely on precise custom strings. We cannot do any
706− -- any formatting here without potentially breaking someone's code.
1043+ -- formatting here without potentially breaking someone's code.
707 atom str
1044 atom str
708 txt "|]"
1045 txt "|]"
709 HsSpliced {} -> notImplemented "HsSpliced"
1046 HsSpliced {} -> notImplemented "HsSpliced"
710− XSplice {} -> notImplemented "XSplice"
1047+ HsSplicedT {} -> notImplemented "HsSplicedT"
1048+ XSplice x -> noExtCon x
712−p_hsSpliceTH
1050+p_hsSpliceTH ::
713− :: Bool -- ^ Typed splice?
1051+ -- | Typed splice?
714− -> LHsExpr GhcPs -- ^ Splice expression
1052+ Bool ->
715− -> SpliceDecoration -- ^ Splice decoration
1053+ -- | Splice expression
716− -> R ()
1054+ LHsExpr GhcPs ->
1055+ -- | Splice decoration
1056+ SpliceDecoration ->
717p_hsSpliceTH isTyped expr = \case
1058p_hsSpliceTH isTyped expr = \case
718 HasParens -> do
1059 HasParens -> do
719 txt decoSymbol
1060 txt decoSymbol
720− parens (located expr (sitcc . p_hsExpr))
1061+ parens N (located expr (sitcc . p_hsExpr))
721 HasDollar -> do
1062 HasDollar -> do
722 txt decoSymbol
1063 txt decoSymbol
723 located expr (sitcc . p_hsExpr)
1064 located expr (sitcc . p_hsExpr)
724− NoParens -> do
1065+ NoParens ->
725 located expr (sitcc . p_hsExpr)
1066 located expr (sitcc . p_hsExpr)
727 decoSymbol = if isTyped then "$$" else "$"
1068 decoSymbol = if isTyped then "$$" else "$"
729p_hsBracket :: HsBracket GhcPs -> R ()
1070p_hsBracket :: HsBracket GhcPs -> R ()
730p_hsBracket = \case
1071p_hsBracket = \case
731− ExpBr NoExt expr -> quote "e" (located expr p_hsExpr)
1072+ ExpBr NoExtField expr -> do
732− PatBr NoExt pat -> quote "p" (located pat p_pat)
1073+ anns <- getEnclosingAnns
733− DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
1074+ let name = case anns of
734− DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
1075+ AnnOpenEQ : _ -> ""
735− TypBr NoExt ty -> quote "t" (located ty p_hsType)
1076+ _ -> "e"
736− VarBr NoExt isSingleQuote name -> do
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
737 txt (bool "''" "'" isSingleQuote)
1083 txt (bool "''" "'" isSingleQuote)
738− p_rdrName (noLoc name)
1084+ -- HACK As you can see we use 'noLoc' here to be able to pass name into
739− TExpBr NoExt expr -> do
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.
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
740 txt "[||"
1098 txt "[||"
741 breakpoint'
1099 breakpoint'
742 located expr p_hsExpr
1100 located expr p_hsExpr
743 breakpoint'
1101 breakpoint'
744 txt "||]"
1102 txt "||]"
745− XBracket {} -> notImplemented "XBracket"
1103+ XBracket x -> noExtCon x
747 quote :: Text -> R () -> R ()
1105 quote :: Text -> R () -> R ()
748 quote name body = do
1106 quote name body = do
@@ -750,23 +1108,86 @@ p_hsBracket = \case
750 txt name
1108 txt name
752 breakpoint'
1110 breakpoint'
754− breakpoint'
1112+ dontUseBraces body
755− txt "|]"
1113+ breakpoint'
1116+-- Print the source text of a string literal while indenting
1119+p_stringLit :: String -> R ()
1121+ let s = splitGaps src
1123+ txt $ Text.pack (mconcat s)
1125+ sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126+ in vlayout singleLine multiLine
1128+ -- Split a string on gaps (backslash delimited whitespaces)
1130+ -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131+ splitGaps :: String -> [String]
1134+ let -- A backslash and a whitespace starts a "gap"
1135+ p (Just '\\', _, _) = True
1136+ p (_, '\\', Just c) | ghcSpace c = False
1138+ in case span p (zipPrevNext s) of
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
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)]
1158+ (zip (Nothing : map Just xs) xs)
1159+ (map Just (tail xs) ++ repeat Nothing)
1160+ in map (\((p, x), n) -> (p, x, n)) z
757----------------------------------------------------------------------------
1163----------------------------------------------------------------------------
758-- Helpers
1164-- Helpers
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
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
760getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1181getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
761−getGRHSSpan (GRHS NoExt _ body) = getLoc body
1182+getGRHSSpan (GRHS NoExtField guards body) =
762−getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1183+ combineSrcSpans' $ getLoc body :| map getLoc guards
1184+getGRHSSpan (XGRHS x) = noExtCon x
764-- | Place a thing that may have a hanging form. This function handles how
1186-- | Place a thing that may have a hanging form. This function handles how
765-- to separate it from preceding expressions and whether to bump indentation
1187-- to separate it from preceding expressions and whether to bump indentation
766-- depending on what sort of expression we have.
1188-- depending on what sort of expression we have.
768placeHanging :: Placement -> R () -> R ()
1189placeHanging :: Placement -> R () -> R ()
769−placeHanging placement m = do
1190+placeHanging placement m =
770 case placement of
1191 case placement of
771 Hanging -> do
1192 Hanging -> do
@@ -777,49 +1198,165 @@ placeHanging placement m = do
778-- | Check if given block contains single expression which has a hanging
1199-- | Check if given block contains single expression which has a hanging
780−
1201+blockPlacement ::
781−blockPlacement
1202+ (body -> Placement) ->
782− :: (body -> Placement)
1203+ [LGRHS GhcPs (Located body)] ->
783− -> [LGRHS GhcPs (Located body)]
1204+ Placement
784− -> Placement
1205+blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
785−blockPlacement placer [(L _ (GRHS NoExt _ (L _ x)))] = placer x
786blockPlacement _ _ = Normal
1206blockPlacement _ _ = Normal
788-- | Check if given command has a hanging form.
1208-- | Check if given command has a hanging form.
790cmdPlacement :: HsCmd GhcPs -> Placement
1209cmdPlacement :: HsCmd GhcPs -> Placement
791cmdPlacement = \case
1210cmdPlacement = \case
792− HsCmdLam NoExt _ -> Hanging
1211+ HsCmdLam NoExtField _ -> Hanging
793− HsCmdCase NoExt _ _ -> Hanging
1212+ HsCmdCase NoExtField _ _ -> Hanging
794− HsCmdDo NoExt _ -> Hanging
1213+ HsCmdDo NoExtField _ -> Hanging
795 _ -> Normal
1214 _ -> Normal
797cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1216cmdTopPlacement :: HsCmdTop GhcPs -> Placement
798cmdTopPlacement = \case
1217cmdTopPlacement = \case
799− HsCmdTop NoExt (L _ x) -> cmdPlacement x
1218+ HsCmdTop NoExtField (L _ x) -> cmdPlacement x
800− XCmdTop {} -> notImplemented "XCmdTop"
1219+ XCmdTop x -> noExtCon x
802-- | Check if given expression has a hanging form.
1221-- | Check if given expression has a hanging form.
804exprPlacement :: HsExpr GhcPs -> Placement
1222exprPlacement :: HsExpr GhcPs -> Placement
805exprPlacement = \case
1223exprPlacement = \case
806− HsLam NoExt _ -> Hanging
1224+ -- Only hang lambdas with single line parameter lists
807− HsLamCase NoExt _ -> Hanging
1225+ HsLam NoExtField mg -> case mg of
808− HsCase NoExt _ _ -> Hanging
1226+ MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
809− HsDo NoExt DoExpr _ -> Hanging
1227+ | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
810− HsDo NoExt MDoExpr _ -> Hanging
1228+ Hanging
811− RecordCon NoExt _ _ -> Hanging
1229+ _ -> Normal
812− HsProc NoExt (L s _) _ ->
1230+ HsLamCase NoExtField _ -> Hanging
813− -- Indentation breaks if pattern is longer than one line and left hanging.
1231+ HsCase NoExtField _ _ -> Hanging
814− -- Consequentally, once apply hanging when it is safe.
1232+ HsDo NoExtField DoExpr _ -> Hanging
815− if isOneLineSpan s
1233+ HsDo NoExtField MDoExpr _ -> Hanging
816− then Hanging
1234+ OpApp NoExtField _ op y ->
817− else Normal
1235+ case (fmap getOpNameStr . getOpName . unLoc) op of
1236+ Just "$" -> exprPlacement (unLoc y)
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)
818 _ -> Normal
1245 _ -> Normal
820withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1247withGuards :: [LGRHS GhcPs (Located body)] -> Bool
821withGuards = any (checkOne . unLoc)
1248withGuards = any (checkOne . unLoc)
823 checkOne :: GRHS GhcPs (Located body) -> Bool
1250 checkOne :: GRHS GhcPs (Located body) -> Bool
824− checkOne (GRHS NoExt [] _) = False
1251+ checkOne (GRHS NoExtField [] _) = False
825 checkOne _ = True
1252 checkOne _ = True
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
1258+getOpName :: HsExpr GhcPs -> Maybe RdrName
1260+ HsVar NoExtField (L _ a) -> Just a
1263+getOpNameStr :: RdrName -> String
1264+getOpNameStr = occNameString . rdrNameOcc
1267+ -- | Bracket style to use
1269+ OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) ->
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
1278+ (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1280+ OpNode (L _ n) -> exprPlacement n
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
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)
1299+ switchLayout [opTreeLoc 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
1308+ OpNode (L _ HsDo {}) -> True
1310+ useRecordDot' <- useRecordDot
1322+ inciIf (isDoBlock y) p_y
1324+ && isOneLineSpan (opTreeLoc x)
1325+ && placement == Normal -> do
1331+ | useRecordDot' && gotRecordDot -> do
1333+ when isSection space
1338+ placeHanging placement $ do
1343+-- | Return 'True' if given expression is a record-dot operator expression.
1345+ -- | Operator expression
1347+ -- | Span of the expression on the right-hand side of the operator
1350+isRecordDot op (RealSrcSpan ySpan) = case op of
1351+ HsVar NoExtField (L (RealSrcSpan opSpan) opName) ->
1352+ (getOpNameStr opName == ".") && (srcSpanEndCol opSpan == srcSpanStartCol ySpan)
1354+isRecordDot _ _ = False
1356+-- | Get annotations for the enclosing element.
1357+getEnclosingAnns :: R [AnnKeywordId]
1358+getEnclosingAnns = do
1359+ e <- getEnclosingSpan (const True)
1361+ Nothing -> return []
1362+ Just e' -> getAnns (RealSrcSpan e')