@@ -1,33 +1,43 @@
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
8+ ( p_valDecl,
9+ p_pat,
10+ p_hsExpr,
11+ p_hsSplice,
12+ p_stringLit,
1013 )
1114where
1215
1316import Bag (bagToList)
1417import BasicTypes
1518import Control.Monad
19+import Ctype (is_space)
1620import Data.Bool (bool)
21+import Data.Char (isPunctuation, isSymbol)
1722import Data.Data hiding (Infix, Prefix)
23+import Data.Functor ((<&>))
1824import Data.List (intersperse, sortOn)
25+import Data.List.NonEmpty (NonEmpty (..), (<|))
26+import qualified Data.List.NonEmpty as NE
1927import Data.Text (Text)
28+import qualified Data.Text as Text
2029import GHC
30+import OccName (occNameString)
2131import Ormolu.Printer.Combinators
32+import Ormolu.Printer.Internal
2233import Ormolu.Printer.Meat.Common
34+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
2335import Ormolu.Printer.Meat.Declaration.Signature
2436import Ormolu.Printer.Meat.Type
37+import Ormolu.Printer.Operators
2538import 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
3039
40+-- | Style of a group of equations.
3141data MatchGroupStyle
3242 = Function (Located RdrName)
3343 | PatternBind
@@ -35,87 +45,132 @@ data MatchGroupStyle
3545 | Lambda
3646 | LambdaCase
3747
48+-- | Style of equations in a group.
3849data GroupStyle
3950 = EqualSign
4051 | RightArrow
4152
4253-- | Expression placement. This marks the places where expressions that
4354-- implement handing forms may use them.
44−
4555data Placement
46− = Normal -- ^ Multi-line layout should cause
47− -- insertion of a newline and indentation
48− -- bump
49− | Hanging -- ^ Expressions that have hanging form
50− -- should use it and avoid bumping one level
51− -- 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)
5265
5366p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
54−p_valDecl = line . p_valDecl'
55−
56−p_valDecl' :: HsBindLR GhcPs GhcPs -> R ()
57−p_valDecl' = \case
58− FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
59− PatBind NoExt pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
67+p_valDecl = \case
68+ FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
69+ PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
6070 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
6171 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
62− PatSynBind NoExt psb -> p_patSynBind psb
63− XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
64−
65−p_funBind
66− :: Located RdrName
67− -> MatchGroup GhcPs (LHsExpr GhcPs)
68− -> R ()
69−p_funBind name mgroup =
70− p_matchGroup (Function name) mgroup
71−
72−p_matchGroup
73− :: MatchGroupStyle
74− -> MatchGroup GhcPs (LHsExpr GhcPs)
75− -> R ()
72+ PatSynBind NoExtField psb -> p_patSynBind psb
73+ XHsBindsLR x -> noExtCon x
74+
75+p_funBind ::
76+ Located RdrName ->
77+ MatchGroup GhcPs (LHsExpr GhcPs) ->
78+ R ()
79+p_funBind name = p_matchGroup (Function name)
80+
81+p_matchGroup ::
82+ MatchGroupStyle ->
83+ MatchGroup GhcPs (LHsExpr GhcPs) ->
84+ R ()
7685p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
7786
78−p_matchGroup'
79− :: Data body
80− => (body -> Placement)
81− -> (body -> R ())
82− -> MatchGroupStyle
83− -> MatchGroup GhcPs (Located body)
84− -> R ()
85−p_matchGroup' placer pretty style MG {..} =
86− locatedVia Nothing mg_alts $
87− newlineSep (located' (\m@Match {..} ->
88− p_match' placer pretty style (isInfixMatch m) (matchStrictness m) m_pats m_grhss))
89−p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
87+p_matchGroup' ::
88+ Data body =>
89+ -- | How to get body placement
90+ (body -> Placement) ->
91+ -- | How to print body
92+ (body -> R ()) ->
93+ -- | Style of this group of equations
94+ MatchGroupStyle ->
95+ -- | Match group
96+ MatchGroup GhcPs (Located body) ->
97+ R ()
98+p_matchGroup' placer render style MG {..} = do
99+ let ob = case style of
100+ Case -> id
101+ LambdaCase -> id
102+ _ -> dontUseBraces
103+ -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
104+ -- restore the brace state inside the sepsemi.
105+ ub <- bool dontUseBraces useBraces <$> canUseBraces
106+ ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
107+ where
108+ p_Match m@Match {..} =
109+ p_match'
110+ placer
111+ render
112+ (adjustMatchGroupStyle m style)
113+ (isInfixMatch m)
114+ (matchStrictness m)
115+ m_pats
116+ m_grhss
117+ p_Match (XMatch x) = noExtCon x
118+p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
119+
120+-- | Function id obtained through pattern matching on 'FunBind' should not
121+-- be used to print the actual equations because the different ‘RdrNames’
122+-- used in the equations may have different “decorations” (such as backticks
123+-- and paretheses) associated with them. It is necessary to use per-equation
124+-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
125+-- name inside of 'Function' accordingly.
126+adjustMatchGroupStyle ::
127+ Match GhcPs body ->
128+ MatchGroupStyle ->
129+ MatchGroupStyle
130+adjustMatchGroupStyle m = \case
131+ Function _ -> (Function . mc_fun . m_ctxt) m
132+ style -> style
90133
91134matchStrictness :: Match id body -> SrcStrictness
92135matchStrictness match =
93136 case m_ctxt match of
94− FunRhs{mc_strictness=s} -> s
137+ FunRhs {mc_strictness = s} -> s
95138 _ -> NoSrcStrict
96139
97−p_match
98− :: MatchGroupStyle
99− -> Bool -- ^ Is this an infix match?
100− -> SrcStrictness -- ^ Strictness prefix (FunBind)
101− -> [LPat GhcPs]
102− -> GRHSs GhcPs (LHsExpr GhcPs)
103− -> 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 ()
104152p_match = p_match' exprPlacement p_hsExpr
105153
106−p_match'
107− :: Data body
108− => (body -> Placement)
109− -> (body -> R ())
110− -> MatchGroupStyle
111− -> Bool -- ^ Is this an infix match?
112− -> SrcStrictness -- ^ Strictness prefix (FunBind)
113− -> [LPat GhcPs]
114− -> GRHSs GhcPs (Located body)
115− -> R ()
116−p_match' placer pretty style isInfix strictness m_pats m_grhss = do
117− -- NOTE Normally, since patterns may be placed in a multi-line layout, it
118− -- 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
119174 -- indented than function name. This in turn means that indentation for
120175 -- the body should also be bumped. Normally this would mean that bodies
121176 -- would start with two indentation steps applied, which is ugly, so we
@@ -125,23 +180,24 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
125180 NoSrcStrict -> return ()
126181 SrcStrict -> txt "!"
127182 SrcLazy -> txt "~"
128− inci' <- case NE.nonEmpty m_pats of
129− Nothing -> id <$ case style of
130− Function name -> p_rdrName name
131− _ -> return ()
183+ indentBody <- case NE.nonEmpty m_pats of
184+ Nothing ->
185+ False <$ case style of
186+ Function name -> p_rdrName name
187+ _ -> return ()
132188 Just ne_pats -> do
133− let combinedSpans = combineSrcSpans' $
134− getLoc <$> ne_pats
135− inci' = if isOneLineSpan combinedSpans
136− then id
137− else inci
138− switchLayout combinedSpans $ do
139− let stdCase = velt' (located' p_pat <$> m_pats)
189+ let combinedSpans = case style of
190+ Function name -> combineSrcSpans (getLoc name) patSpans
191+ _ -> patSpans
192+ patSpans = combineSrcSpans' (getLoc <$> ne_pats)
193+ indentBody = not (isOneLineSpan combinedSpans)
194+ switchLayout [combinedSpans] $ do
195+ let stdCase = sep breakpoint (located' p_pat) m_pats
140196 case style of
141197 Function name ->
142198 p_infixDefHelper
143199 isInfix
144− inci'
200+ indentBody
145201 (p_rdrName name)
146202 (located' p_pat <$> m_pats)
147203 PatternBind -> stdCase
@@ -152,224 +208,256 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
152208 BangPat _ _ -> True
153209 SplicePat _ _ -> True
154210 _ -> False
155− txt (if needsSpace then "\\ " else "\\")
156− stdCase
211+ txt "\\"
212+ when needsSpace space
213+ sitcc stdCase
157214 LambdaCase -> stdCase
158− return inci'
159−
160− let
161− -- Calculate position of end of patterns. This is useful when we decide
162− -- about putting certain constructions in hanging positions.
163− endOfPats = case NE.nonEmpty m_pats of
164− Nothing -> case style of
165− Function name -> (Just . srcSpanEnd . getLoc) name
166− _ -> Nothing
167− Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
168− isCase = \case
169− Case -> True
170− LambdaCase -> True
171− _ -> False
172− inci' $ do
173− let GRHSs {..} = m_grhss
174− hasGuards = withGuards grhssGRHSs
175− unless (length grhssGRHSs > 1) $ do
176− case style of
177− Function _ | hasGuards -> return ()
178− Function _ -> txt " ="
179− PatternBind -> txt " ="
180− s | isCase s && hasGuards -> return ()
181− _ -> txt " ->"
182− let grhssSpan = combineSrcSpans' $
215+ return indentBody
216+ let -- Calculate position of end of patterns. This is useful when we decide
217+ -- about putting certain constructions in hanging positions.
218+ endOfPats = case NE.nonEmpty m_pats of
219+ Nothing -> case style of
220+ Function name -> Just (getLoc name)
221+ _ -> Nothing
222+ Just pats -> (Just . getLoc . NE.last) pats
223+ isCase = \case
224+ Case -> True
225+ LambdaCase -> True
226+ _ -> False
227+ hasGuards = withGuards grhssGRHSs
228+ grhssSpan =
229+ combineSrcSpans' $
183230 getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
184− patGrhssSpan = maybe grhssSpan
185− (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
186− placement =
187− case endOfPats of
188− Nothing -> blockPlacement placer grhssGRHSs
189− Just spn ->
190− if isOneLineSpan
191− (mkSrcSpan spn (srcSpanStart grhssSpan))
192− then blockPlacement placer grhssGRHSs
193− else Normal
194− inciLocalBinds = case placement of
195− Normal -> id
196− Hanging -> inci
197− p_body = do
198− let groupStyle =
199− if isCase style && hasGuards
231+ patGrhssSpan =
232+ maybe
233+ grhssSpan
234+ (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
235+ endOfPats
236+ placement =
237+ case endOfPats of
238+ Nothing -> blockPlacement placer grhssGRHSs
239+ Just spn ->
240+ if onTheSameLine spn grhssSpan
241+ then blockPlacement placer grhssGRHSs
242+ else Normal
243+ p_body = do
244+ let groupStyle =
245+ if isCase style && hasGuards
200246 then RightArrow
201247 else EqualSign
202− newlineSep (located' (p_grhs' pretty groupStyle)) grhssGRHSs
203− let whereLocation = combineSrcSpans patGrhssSpan $ getLoc grhssLocalBinds
204− unless
205− (GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds))
206− (inciLocalBinds . switchLayout whereLocation $ do
207− breakpoint
208− txt "where"
209− breakpoint
210− inci (located grhssLocalBinds p_hsLocalBinds)
211− )
212− case style of
213− Lambda -> placeHanging placement $
214− switchLayout patGrhssSpan p_body
215− _ -> switchLayout patGrhssSpan $
216− placeHanging placement p_body
248+ sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
249+ p_where = do
250+ let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
251+ unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
252+ breakpoint
253+ txt "where"
254+ unless whereIsEmpty breakpoint
255+ inci $ located grhssLocalBinds p_hsLocalBinds
256+ inciIf indentBody $ do
257+ unless (length grhssGRHSs > 1) $
258+ case style of
259+ Function _ | hasGuards -> return ()
260+ Function _ -> space >> inci equals
261+ PatternBind -> space >> inci equals
262+ s | isCase s && hasGuards -> return ()
263+ _ -> space >> txt "->"
264+ switchLayout [patGrhssSpan] $
265+ placeHanging placement p_body
266+ inci p_where
267+p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
217268
218269p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
219−p_grhs = p_grhs' p_hsExpr
220−
221−p_grhs'
222− :: Data body
223− => (body -> R ())
224− -> GroupStyle
225− -> GRHS GhcPs (Located body)
226− -> R ()
227−p_grhs' pretty style (GRHS NoExt guards body) =
270+p_grhs = p_grhs' exprPlacement p_hsExpr
271+
272+p_grhs' ::
273+ Data body =>
274+ -- | How to get body placement
275+ (body -> Placement) ->
276+ -- | How to print body
277+ (body -> R ()) ->
278+ GroupStyle ->
279+ GRHS GhcPs (Located body) ->
280+ R ()
281+p_grhs' placer render style (GRHS NoExtField guards body) =
228282 case guards of
229283 [] -> p_body
230284 xs -> do
231− txt "| "
232− velt $ withSep comma (located' p_stmt) xs
285+ txt "|"
233286 space
234− txt $ case style of
235− EqualSign -> "="
236− RightArrow -> "->"
237− breakpoint
238− inci p_body
287+ sitcc (sep commaDel (sitcc . located' p_stmt) xs)
288+ space
289+ inci $ case style of
290+ EqualSign -> equals
291+ RightArrow -> txt "->"
292+ placeHanging placement p_body
239293 where
240− p_body = located body pretty
241−p_grhs' _ _ (XGRHS NoExt) = notImplemented "XGRHS"
294+ placement =
295+ case endOfGuards of
296+ Nothing -> placer (unLoc body)
297+ Just spn ->
298+ if onTheSameLine spn (getLoc body)
299+ then placer (unLoc body)
300+ else Normal
301+ endOfGuards =
302+ case NE.nonEmpty guards of
303+ Nothing -> Nothing
304+ Just gs -> (Just . getLoc . NE.last) gs
305+ p_body = located body render
306+p_grhs' _ _ _ (XGRHS x) = noExtCon x
242307
243308p_hsCmd :: HsCmd GhcPs -> R ()
244309p_hsCmd = \case
245− HsCmdArrApp NoExt body input arrType _ -> do
310+ HsCmdArrApp NoExtField body input arrType _ -> do
246311 located body p_hsExpr
247− txt $ case arrType of
248− HsFirstOrderApp -> " -<"
249− HsHigherOrderApp -> " -<<"
250− placeHanging (exprPlacement (unLoc input)) $
251− located input p_hsExpr
252− 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
253320 located form p_hsExpr
254− unless (null cmds) $ do
321+ unless (null cmds) $ do
255322 breakpoint
256323 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
257− HsCmdArrForm NoExt form Infix _ [left, right] -> do
324+ HsCmdArrForm NoExtField form Infix _ [left, right] -> do
258325 located left p_hsCmdTop
259326 space
260327 located form p_hsExpr
261328 placeHanging (cmdTopPlacement (unLoc right)) $
262329 located right p_hsCmdTop
263− HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
330+ HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
264331 HsCmdApp {} ->
265332 -- XXX Does this ever occur in the syntax tree? It does not seem like it
266333 -- does. Open an issue and ping @yumiova if this ever occurs in output.
267334 notImplemented "HsCmdApp"
268− HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
269− HsCmdPar NoExt c -> parens (located c p_hsCmd)
270− HsCmdCase NoExt e mgroup -> do
271− txt "case "
272− located e p_hsExpr
273− txt " of"
274− breakpoint
275− inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
276− HsCmdIf NoExt _ if' then' else' -> do
277− txt "if "
278− located if' p_hsExpr
279− breakpoint
280− txt "then"
281− located then' $ \x -> do
282− breakpoint
283− inci (p_hsCmd x)
284− breakpoint
285− txt "else"
286− located else' $ \x -> do
287− breakpoint
288− inci (p_hsCmd x)
289− HsCmdLet NoExt localBinds c -> do
290− txt "let "
291− sitcc (located localBinds p_hsLocalBinds)
292− breakpoint
293− txt "in "
294− sitcc (located c p_hsCmd)
295− 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
296344 txt "do"
297345 newline
298− 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))
299348 HsCmdWrap {} -> notImplemented "HsCmdWrap"
300− XCmd {} -> notImplemented "XCmd"
349+ XCmd x -> noExtCon x
301350
302351p_hsCmdTop :: HsCmdTop GhcPs -> R ()
303352p_hsCmdTop = \case
304− HsCmdTop NoExt cmd -> located cmd p_hsCmd
305− 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)
306384
307385p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
308−p_stmt = p_stmt' p_hsExpr
309−
310−p_stmt'
311− :: Data body
312− => (body -> R ())
313− -> Stmt GhcPs (Located body)
314− -> R ()
315−p_stmt' pretty = \case
316− LastStmt NoExt body _ _ -> located body pretty
317− BindStmt NoExt l f _ _ -> do
318− located l p_pat
386+p_stmt = p_stmt' exprPlacement p_hsExpr
387+
388+p_stmt' ::
389+ Data body =>
390+ -- | Placer
391+ (body -> Placement) ->
392+ -- | Render
393+ (body -> R ()) ->
394+ -- | Statement to render
395+ Stmt GhcPs (Located body) ->
396+ R ()
397+p_stmt' placer render = \case
398+ LastStmt NoExtField body _ _ -> located body render
399+ BindStmt NoExtField p f _ _ -> do
400+ located p p_pat
319401 space
320402 txt "<-"
321− breakpoint
322− 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)
323413 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
324− BodyStmt NoExt body _ _ -> located body pretty
325− LetStmt NoExt binds -> do
326− txt "let "
414+ BodyStmt NoExtField body _ _ -> located body render
415+ LetStmt NoExtField binds -> do
416+ txt "let"
417+ space
327418 sitcc $ located binds p_hsLocalBinds
328419 ParStmt {} ->
329− -- NOTE 'ParStmt' should always be eliminated in 'gatherStmt' already,
330− -- such that it never occurs in 'p_stmt''. Consequently, handling it
331− -- 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.
332423 notImplemented "ParStmt"
333− TransStmt {..} -> do
334− -- NOTE 'TransStmt' only needs to account for pretty printing itself,
335− -- since pretty printing of relevant statements (e.g., in 'trS_stmts')
336− -- 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'.
337428 case (trS_form, trS_by) of
338− (ThenForm, Nothing) -> located trS_using $ \x -> do
429+ (ThenForm, Nothing) -> do
339430 txt "then"
340431 breakpoint
341− inci (p_hsExpr x)
432+ inci $ located trS_using p_hsExpr
342433 (ThenForm, Just e) -> do
343− located trS_using $ \x -> do
344− txt "then"
345− breakpoint
346− inci (p_hsExpr x)
434+ txt "then"
347435 breakpoint
348− located e $ \x -> do
349− txt "by"
350− breakpoint
351− inci (p_hsExpr x)
352− (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
353442 txt "then group using"
354443 breakpoint
355− inci (p_hsExpr x)
444+ inci $ located trS_using p_hsExpr
356445 (GroupForm, Just e) -> do
357− located e $ \x -> do
358− txt "then group by"
359− breakpoint
360− inci (p_hsExpr x)
446+ txt "then group by"
361447 breakpoint
362− located trS_using $ \x -> do
363− txt "using"
364− breakpoint
365− inci (p_hsExpr x)
448+ inci $ located e p_hsExpr
449+ breakpoint
450+ txt "using"
451+ breakpoint
452+ inci $ located trS_using p_hsExpr
366453 RecStmt {..} -> do
367− txt "rec "
368− sitcc $ newlineSep (located' (p_stmt' pretty)) recS_stmts
369− XStmtLR {} -> notImplemented "XStmtLR"
454+ txt "rec"
455+ space
456+ sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457+ XStmtLR c -> noExtCon c
370458
371459gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
372−gatherStmt (L _ (ParStmt NoExt block _ _)) =
460+gatherStmt (L _ (ParStmt NoExtField block _ _)) =
373461 foldr ((<>) . gatherStmtBlock) [] block
374462gatherStmt (L s stmt@TransStmt {..}) =
375463 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
@@ -378,438 +466,641 @@ gatherStmt stmt = [[stmt]]
378466gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
379467gatherStmtBlock (ParStmtBlock _ stmts _ _) =
380468 foldr (liftAppend . gatherStmt) [] stmts
381−gatherStmtBlock XParStmtBlock {} = notImplemented "XParStmtBlock"
469+gatherStmtBlock (XParStmtBlock x) = noExtCon x
382470
383471p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
384472p_hsLocalBinds = \case
385− HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
386− let ssStart = either
387− (srcSpanStart . getLoc)
388− (srcSpanStart . getLoc)
389− items =
390− (Left <$> bagToList bag) ++ (Right <$> lsigs)
391− p_item (Left x) = located x p_valDecl'
392− p_item (Right x) = located x p_sigDecl'
393− newlineSep p_item (sortOn ssStart items)
394− HsValBinds NoExt _ -> notImplemented "HsValBinds"
395− HsIPBinds NoExt _ -> notImplemented "HsIPBinds"
396− EmptyLocalBinds NoExt -> return ()
397− XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
398−
399−p_hsRecField
400− :: (Data id, Outputable id)
401− => HsRecField' id (LHsExpr GhcPs)
402− -> R ()
403−p_hsRecField = \HsRecField {..} -> do
404− located hsRecFieldLbl atom
405− unless hsRecPun $ do
406− txt " = "
407− located hsRecFieldArg p_hsExpr
408−
409−p_hsTupArg :: HsTupArg GhcPs -> R ()
410−p_hsTupArg = \case
411− Present NoExt x -> located x p_hsExpr
412− Missing NoExt -> pure ()
413− XTupArg {} -> notImplemented "XTupArg"
473+ HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
474+ -- When in a single-line layout, there is a chance that the inner
475+ -- elements will also contain semicolons and they will confuse the
476+ -- parser. so we request braces around every element except the last.
477+ br <- layoutToBraces <$> getLayout
478+ let items =
479+ let injectLeft (L l x) = L l (Left x)
480+ injectRight (L l x) = L l (Right x)
481+ in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
482+ positionToBracing = \case
483+ SinglePos -> id
484+ FirstPos -> br
485+ MiddlePos -> br
486+ LastPos -> id
487+ p_item' (p, item) =
488+ positionToBracing p $
489+ withSpacing (either p_valDecl p_sigDecl) item
490+ binds = sortOn (srcSpanStart . getLoc) items
491+ sitcc $ sepSemi p_item' (attachRelativePos binds)
492+ HsValBinds NoExtField _ -> notImplemented "HsValBinds"
493+ HsIPBinds NoExtField (IPBinds NoExtField xs) ->
494+ -- Second argument of IPBind is always Left before type-checking.
495+ let p_ipBind (IPBind NoExtField (Left name) expr) = do
496+ atom name
497+ space
498+ equals
499+ breakpoint
500+ useBraces $ inci $ located expr p_hsExpr
501+ p_ipBind (IPBind NoExtField (Right _) _) =
502+ -- Should only occur after the type checker
503+ notImplemented "IPBind _ (Right _) _"
504+ p_ipBind (XIPBind x) = noExtCon x
505+ in sepSemi (located' p_ipBind) xs
506+ HsIPBinds NoExtField _ -> notImplemented "HsIpBinds"
507+ EmptyLocalBinds NoExtField -> return ()
508+ XHsLocalBindsLR x -> noExtCon x
509+
510+p_hsRecField ::
511+ HsRecField' RdrName (LHsExpr GhcPs) ->
512+ R ()
513+p_hsRecField HsRecField {..} = do
514+ p_rdrName hsRecFieldLbl
515+ unless hsRecPun $ do
516+ space
517+ equals
518+ let placement =
519+ if onTheSameLine (getLoc hsRecFieldLbl) (getLoc hsRecFieldArg)
520+ then exprPlacement (unLoc hsRecFieldArg)
521+ else Normal
522+ placeHanging placement (located hsRecFieldArg p_hsExpr)
414523
415524p_hsExpr :: HsExpr GhcPs -> R ()
416−p_hsExpr = \case
417− HsVar NoExt name -> p_rdrName name
418− HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
419− HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
420− 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 ->
421533 case x of
422− Unambiguous NoExt name -> p_rdrName name
423− Ambiguous NoExt name -> p_rdrName name
424− XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
425− 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
426538 txt "#"
427539 atom v
428− HsIPVar NoExt (HsIPName name) -> do
540+ HsIPVar NoExtField (HsIPName name) -> do
429541 txt "?"
430542 atom name
431− HsOverLit NoExt v -> atom (ol_val v)
432− HsLit NoExt lit -> atom lit
433− HsLam NoExt mgroup ->
543+ HsOverLit NoExtField v -> atom (ol_val v)
544+ HsLit NoExtField lit ->
545+ case lit of
546+ HsString (SourceText stxt) _ -> p_stringLit stxt
547+ HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
548+ r -> atom r
549+ HsLam NoExtField mgroup ->
434550 p_matchGroup Lambda mgroup
435− HsLamCase NoExt mgroup -> do
551+ HsLamCase NoExtField mgroup -> do
436552 txt "\\case"
437− newline
438− inci (p_matchGroup LambdaCase mgroup)
439− HsApp NoExt f x -> do
440− located f p_hsExpr
441553 breakpoint
442− inci (located x p_hsExpr)
443− HsAppType a e -> do
554+ inci (p_matchGroup LambdaCase mgroup)
555+ HsApp NoExtField f x -> do
556+ let -- In order to format function applications with multiple parameters
557+ -- nicer, traverse the AST to gather the function and all the
558+ -- parameters together.
559+ gatherArgs f' knownArgs =
560+ case f' of
561+ L _ (HsApp _ l r) -> gatherArgs l (r <| knownArgs)
562+ _ -> (f', knownArgs)
563+ (func, args) = gatherArgs f (x :| [])
564+ -- We need to handle the last argument specially if it is a
565+ -- hanging construct, so separate it from the rest.
566+ (initp, lastp) = (NE.init args, NE.last args)
567+ initSpan =
568+ combineSrcSpans' $
569+ getLoc f :| [(srcLocSpan . srcSpanStart . getLoc) lastp]
570+ -- Hang the last argument only if the initial arguments span one
571+ -- line.
572+ placement =
573+ if isOneLineSpan initSpan
574+ then exprPlacement (unLoc lastp)
575+ else Normal
576+ -- If the last argument is not hanging, just separate every argument as
577+ -- usual. If it is hanging, print the initial arguments and hang the
578+ -- last one. Also, use braces around the every argument except the last
579+ -- one.
580+ case placement of
581+ Normal -> do
582+ let -- Usually we want to bump indentation for arguments for the
583+ -- sake of readability. However, when the function itself is a
584+ -- do-block or case expression it is not a good idea. It seems
585+ -- to be safe to always bump indentation when the function
586+ -- expression is parenthesised.
587+ doIndent =
588+ case func of
589+ L _ (HsPar NoExtField _) -> True
590+ L _ (HsAppType NoExtField _ _) -> True
591+ L _ (HsMultiIf NoExtField _) -> True
592+ L spn _ -> isOneLineSpan spn
593+ ub <-
594+ getLayout <&> \case
595+ SingleLine -> useBraces
596+ MultiLine -> id
597+ ub $ do
598+ located func (p_hsExpr' s)
599+ breakpoint
600+ inciIf doIndent $ sep breakpoint (located' p_hsExpr) initp
601+ inciIf doIndent $ do
602+ unless (null initp) breakpoint
603+ located lastp p_hsExpr
604+ Hanging -> do
605+ useBraces . switchLayout [initSpan] $ do
606+ located func (p_hsExpr' s)
607+ breakpoint
608+ sep breakpoint (located' p_hsExpr) initp
609+ placeHanging placement $
610+ located lastp p_hsExpr
611+ HsAppType NoExtField e a -> do
444612 located e p_hsExpr
445613 breakpoint
446614 inci $ do
447615 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 ()
448621 located (hswc_body a) p_hsType
449− OpApp NoExt x op y -> do
450− located x p_hsExpr
451− space
452− let opWrapper = case unLoc op of
453− EWildPat NoExt -> backticks
454− _ -> id
455− located op (opWrapper . p_hsExpr)
456− placeHanging (exprPlacement (unLoc y)) $
457− located y p_hsExpr
458− NegApp NoExt e _ -> do
622+ OpApp NoExtField x op y -> do
623+ let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
624+ p_exprOpTree s (reassociateOpTree getOpName opTree)
625+ NegApp NoExtField e _ -> do
459626 txt "-"
627+ space
460628 located e p_hsExpr
461− HsPar NoExt e -> parens (located e p_hsExpr)
462− SectionL NoExt x op -> do
629+ HsPar NoExtField e ->
630+ parens s (located e (dontUseBraces . p_hsExpr))
631+ SectionL NoExtField x op -> do
463632 located x p_hsExpr
464633 breakpoint
465634 inci (located op p_hsExpr)
466− SectionR NoExt op x -> do
635+ SectionR NoExtField op x -> do
467636 located op p_hsExpr
468− breakpoint
637+ useRecordDot' <- useRecordDot
638+ let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639+ unless (useRecordDot' && isRecordDot') breakpoint
469640 inci (located x p_hsExpr)
470− ExplicitTuple NoExt args boxity -> do
641+ ExplicitTuple NoExtField args boxity ->
471642 let isSection = any (isMissing . unLoc) args
472643 isMissing = \case
473− Missing NoExt -> True
644+ Missing NoExtField -> True
474645 _ -> False
475− 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' =
476652 case boxity of
477653 Boxed -> parens
478654 Unboxed -> parensHash
479− parens' $ if isSection
480− then sequence_ (withSep (txt ",") (located' p_hsTupArg) args)
481− else velt (withSep comma (located' p_hsTupArg) args)
482− ExplicitSum NoExt tag arity e -> do
483− let before = tag - 1
484− after = arity - before - 1
485− args = replicate before Nothing <> [Just e] <> replicate after Nothing
486− f (x,i) = do
487− let isFirst = i == 0
488− isLast = i == arity - 1
489− case x of
490− Nothing ->
491− unless (isFirst || isLast) space
492− Just l -> do
493− unless isFirst space
494− located l p_hsExpr
495− unless isLast space
496− parensHash $ sequence_ (withSep (txt "|") f (zip args [0..]))
497− HsCase NoExt e mgroup -> do
498− txt "case "
499− located e p_hsExpr
500− txt " of"
501− breakpoint
502− inci (p_matchGroup Case mgroup)
503− HsIf NoExt _ if' then' else' -> do
504− txt "if "
505− located if' p_hsExpr
506− breakpoint
507− txt "then"
508− located then' $ \x -> do
509− breakpoint
510− inci (p_hsExpr x)
655+ in if isSection
656+ then
657+ switchLayout [] . parens' s $
658+ sep comma p_larg args
659+ else
660+ switchLayout (getLoc <$> args) . parens' s $
661+ sep commaDel p_larg args
662+ ExplicitSum NoExtField tag arity e ->
663+ p_unboxedSum N tag arity (located e p_hsExpr)
664+ HsCase NoExtField e mgroup ->
665+ p_case exprPlacement p_hsExpr e mgroup
666+ HsIf NoExtField _ if' then' else' ->
667+ p_if exprPlacement p_hsExpr if' then' else'
668+ HsMultiIf NoExtField guards -> do
669+ txt "if"
511670 breakpoint
512− txt "else"
513− located else' $ \x -> do
514− breakpoint
515− inci (p_hsExpr x)
516− HsMultiIf NoExt guards -> do
517− txt "if "
518− sitcc $ newlineSep (located' (p_grhs RightArrow)) guards
519− HsLet NoExt localBinds e -> do
520− txt "let "
521− sitcc (located localBinds p_hsLocalBinds)
522− vlayout space (newline >> space)
523− txt "in "
524− sitcc (located e p_hsExpr)
525− 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
526675 let doBody header = do
527676 txt header
528− newline
529− inci $ located es (newlineSep (located' (sitcc . p_stmt)))
530− compBody = brackets $ located es $ \xs -> do
677+ breakpoint
678+ ub <- layoutToBraces <$> getLayout
679+ inci $
680+ sepSemi
681+ (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
682+ (unLoc es)
683+ compBody = brackets N . located es $ \xs -> do
531684 let p_parBody =
532− sequence_ .
533− intersperse breakpoint .
534− withSep (txt "| ") p_seqBody
685+ sep
686+ (breakpoint >> txt "|" >> space)
687+ p_seqBody
535688 p_seqBody =
536− sequence_ .
537− intersperse (vlayout (pure ()) newline) .
538− withSep comma (located' (sitcc . p_stmt))
689+ sitcc
690+ . sep
691+ commaDel
692+ (located' (sitcc . p_stmt))
539693 stmts = init xs
540694 yield = last xs
541695 lists = foldr (liftAppend . gatherStmt) [] stmts
542696 located yield p_stmt
543697 breakpoint
544− txt "| "
698+ txt "|"
699+ space
545700 p_parBody lists
546701 case ctx of
547702 DoExpr -> doBody "do"
548703 MDoExpr -> doBody "mdo"
549704 ListComp -> compBody
550705 MonadComp -> notImplemented "MonadComp"
551− ArrowExpr -> notImplemented "ArrowExpr"
706+ ArrowExpr -> notImplemented "ArrowExpr"
552707 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
553708 PatGuard _ -> notImplemented "PatGuard"
554709 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
555710 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
556711 ExplicitList _ _ xs ->
557− brackets $ velt (withSep comma (located' p_hsExpr) xs)
712+ brackets s $
713+ sep commaDel (sitcc . located' p_hsExpr) xs
558714 RecordCon {..} -> do
559715 located rcon_con_name atom
560716 breakpoint
561717 let HsRecFields {..} = rcon_flds
562− fields = located' p_hsRecField <$> rec_flds
718+ updName f =
719+ (f :: HsRecField GhcPs (LHsExpr GhcPs))
720+ { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
721+ FieldOcc _ n -> n
722+ XFieldOcc x -> noExtCon x
723+ }
724+ fields = located' (p_hsRecField . updName) <$> rec_flds
563725 dotdot =
564726 case rec_dotdot of
565727 Just {} -> [txt ".."]
566728 Nothing -> []
567− inci $ braces $ velt (withSep comma id (fields <> dotdot))
729+ inci . braces N $
730+ sep commaDel sitcc (fields <> dotdot)
568731 RecordUpd {..} -> do
569732 located rupd_expr p_hsExpr
570− breakpoint
571− inci $ braces $ velt (withSep comma (located' p_hsRecField) rupd_flds)
572− ExprWithTySig affix x -> sitcc $ do
733+ useRecordDot' <- useRecordDot
734+ let mrs sp = case getLoc sp of
735+ RealSrcSpan r -> Just r
736+ _ -> Nothing
737+ let isPluginForm =
738+ ((1 +) . srcSpanEndCol <$> mrs rupd_expr)
739+ == (srcSpanStartCol <$> mrs (head rupd_flds))
740+ unless (useRecordDot' && isPluginForm) breakpoint
741+ let updName f =
742+ (f :: HsRecUpdField GhcPs)
743+ { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
744+ Ambiguous _ n -> n
745+ Unambiguous _ n -> n
746+ XAmbiguousFieldOcc x -> noExtCon x
747+ }
748+ inci . braces N $
749+ sep
750+ commaDel
751+ (sitcc . located' (p_hsRecField . updName))
752+ rupd_flds
753+ ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
573754 located x p_hsExpr
755+ space
756+ txt "::"
574757 breakpoint
575− inci $ do
576− txt ":: "
577− let HsWC {..} = affix
578− HsIB {..} = hswc_body
579− located hsib_body p_hsType
580− 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 ->
581762 case x of
582− From from -> brackets $ do
763+ From from -> brackets s $ do
583764 located from p_hsExpr
584− breakpoint'
765+ breakpoint
585766 txt ".."
586− FromThen from next -> brackets $ do
587− velt (withSep comma (located' p_hsExpr) [from, next])
588− breakpoint'
767+ FromThen from next -> brackets s $ do
768+ sep commaDel (located' p_hsExpr) [from, next]
769+ breakpoint
589770 txt ".."
590− FromTo from to -> brackets $ do
771+ FromTo from to -> brackets s $ do
591772 located from p_hsExpr
592− breakpoint'
593− txt ".. "
773+ breakpoint
774+ txt ".."
775+ space
594776 located to p_hsExpr
595− FromThenTo from next to -> brackets $ do
596− velt (withSep comma (located' p_hsExpr) [from, next])
597− breakpoint'
598− txt ".. "
777+ FromThenTo from next to -> brackets s $ do
778+ sep commaDel (located' p_hsExpr) [from, next]
779+ breakpoint
780+ txt ".."
781+ space
599782 located to p_hsExpr
600− HsSCC NoExt _ name x -> do
783+ HsSCC NoExtField _ name x -> do
601784 txt "{-# SCC "
602785 atom name
603786 txt " #-}"
604787 breakpoint
605788 located x p_hsExpr
606− HsCoreAnn NoExt _ value x -> do
789+ HsCoreAnn NoExtField _ value x -> do
607790 txt "{-# CORE "
608791 atom value
609792 txt " #-}"
610793 breakpoint
611794 located x p_hsExpr
612− HsBracket NoExt x -> p_hsBracket x
795+ HsBracket NoExtField x -> p_hsBracket x
613796 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
614797 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
615− HsSpliceE NoExt splice -> p_hsSplice splice
616− HsProc NoExt p e -> do
798+ HsSpliceE NoExtField splice -> p_hsSplice splice
799+ HsProc NoExtField p e -> do
617800 txt "proc"
618− located p $ \x -> do
801+ located p $ \x -> do
619802 breakpoint
620803 inci (p_pat x)
621804 breakpoint
622805 txt "->"
623− placeHanging (cmdTopPlacement (unLoc e)) (located e p_hsCmdTop)
624− HsStatic _ e -> do
806+ placeHanging (cmdTopPlacement (unLoc e)) $
807+ located e p_hsCmdTop
808+ HsStatic _ e -> do
625809 txt "static"
626810 breakpoint
627811 inci (located e p_hsExpr)
628− HsArrApp NoExt body input arrType cond ->
629− p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
630− HsArrForm NoExt form mfixity cmds ->
631− p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
632812 HsTick {} -> notImplemented "HsTick"
633813 HsBinTick {} -> notImplemented "HsBinTick"
634814 HsTickPragma {} -> notImplemented "HsTickPragma"
635− EWildPat NoExt -> txt "_"
636− EAsPat {} -> notImplemented "EAsPat"
637− EViewPat {} -> notImplemented "EViewPat"
638− ELazyPat {} -> notImplemented "ELazyPat"
639815 HsWrap {} -> notImplemented "HsWrap"
640− XExpr {} -> notImplemented "XExpr"
816+ XExpr x -> noExtCon x
641817
642818p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
643819p_patSynBind PSB {..} = do
644− txt "pattern "
645− let nonEmptySynDetails = \case
646− PrefixCon (_:_) -> True
647− RecCon (_:_) -> True
648− _ -> False
649− case psb_dir of
650− Unidirectional -> do
651− p_rdrName psb_id
652− when (nonEmptySynDetails psb_args) space
653− p_patSynDetails psb_args
654− txt " <-"
655− breakpoint
656− inci (located psb_def p_pat)
657− ImplicitBidirectional -> do
820+ let rhs = do
821+ space
822+ case psb_dir of
823+ Unidirectional -> do
824+ txt "<-"
825+ breakpoint
826+ located psb_def p_pat
827+ ImplicitBidirectional -> do
828+ equals
829+ breakpoint
830+ located psb_def p_pat
831+ ExplicitBidirectional mgroup -> do
832+ txt "<-"
833+ breakpoint
834+ located psb_def p_pat
835+ newline
836+ txt "where"
837+ newline
838+ inci (p_matchGroup (Function psb_id) mgroup)
839+ txt "pattern"
840+ case psb_args of
841+ PrefixCon xs -> do
842+ space
658843 p_rdrName psb_id
659− when (nonEmptySynDetails psb_args) space
660− p_patSynDetails psb_args
661− txt " ="
662− breakpoint
663− inci (located psb_def p_pat)
664− ExplicitBidirectional mgroup -> do
844+ inci $ do
845+ switchLayout (getLoc <$> xs) $ do
846+ unless (null xs) breakpoint
847+ sitcc (sep breakpoint p_rdrName xs)
848+ rhs
849+ RecCon xs -> do
850+ space
665851 p_rdrName psb_id
666− when (nonEmptySynDetails psb_args) space
667− p_patSynDetails psb_args
668− txt " <-"
669− breakpoint
670− inci (located psb_def p_pat)
671− newline
672852 inci $ do
673− line (txt "where")
674− inci (p_matchGroup (Function psb_id) mgroup)
675−p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
676−
677−p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
678−p_patSynDetails = \case
679− PrefixCon xs ->
680− velt' (p_rdrName <$> xs)
681− RecCon xs ->
682− velt' (p_rdrName . recordPatSynPatVar <$> xs)
683− InfixCon _ _ -> notImplemented "InfixCon"
853+ switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
854+ unless (null xs) breakpoint
855+ braces N $
856+ sep commaDel (p_rdrName . recordPatSynPatVar) xs
857+ rhs
858+ InfixCon l r -> do
859+ switchLayout [getLoc l, getLoc r] $ do
860+ space
861+ p_rdrName l
862+ breakpoint
863+ inci $ do
864+ p_rdrName psb_id
865+ space
866+ p_rdrName r
867+ inci rhs
868+p_patSynBind (XPatSynBind x) = noExtCon x
869+
870+p_case ::
871+ Data body =>
872+ -- | Placer
873+ (body -> Placement) ->
874+ -- | Render
875+ (body -> R ()) ->
876+ -- | Expression
877+ LHsExpr GhcPs ->
878+ -- | Match group
879+ MatchGroup GhcPs (Located body) ->
880+ R ()
881+p_case placer render e mgroup = do
882+ txt "case"
883+ space
884+ located e p_hsExpr
885+ space
886+ txt "of"
887+ breakpoint
888+ inci (p_matchGroup' placer render Case mgroup)
889+
890+p_if ::
891+ Data body =>
892+ -- | Placer
893+ (body -> Placement) ->
894+ -- | Render
895+ (body -> R ()) ->
896+ -- | If
897+ LHsExpr GhcPs ->
898+ -- | Then
899+ Located body ->
900+ -- | Else
901+ Located body ->
902+ R ()
903+p_if placer render if' then' else' = do
904+ txt "if"
905+ space
906+ located if' p_hsExpr
907+ breakpoint
908+ inci $ do
909+ txt "then"
910+ space
911+ located then' $ \x ->
912+ placeHanging (placer x) (render x)
913+ breakpoint
914+ txt "else"
915+ space
916+ located else' $ \x ->
917+ placeHanging (placer x) (render x)
918+
919+p_let ::
920+ Data body =>
921+ -- | Render
922+ (body -> R ()) ->
923+ Located (HsLocalBindsLR GhcPs GhcPs) ->
924+ Located body ->
925+ R ()
926+p_let render localBinds e = sitcc $ do
927+ txt "let"
928+ space
929+ dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
930+ vlayout space (newline >> txt " ")
931+ txt "in"
932+ space
933+ sitcc (located e render)
684934
685935p_pat :: Pat GhcPs -> R ()
686936p_pat = \case
687− WildPat NoExt -> txt "_"
688− VarPat NoExt name -> p_rdrName name
689− LazyPat NoExt pat -> do
937+ WildPat NoExtField -> txt "_"
938+ VarPat NoExtField name -> p_rdrName name
939+ LazyPat NoExtField pat -> do
690940 txt "~"
691941 located pat p_pat
692− AsPat NoExt name pat -> do
942+ AsPat NoExtField name pat -> do
693943 p_rdrName name
694944 txt "@"
695945 located pat p_pat
696− ParPat NoExt pat ->
697− located pat (parens . p_pat)
698− BangPat NoExt pat -> do
946+ ParPat NoExtField pat ->
947+ located pat (parens S . p_pat)
948+ BangPat NoExtField pat -> do
699949 txt "!"
700950 located pat p_pat
701− ListPat NoExt pats -> do
702− brackets $ velt (withSep comma (located' p_pat) pats)
703− TuplePat NoExt pats boxing -> do
704− let f =
951+ ListPat NoExtField pats ->
952+ brackets S $ sep commaDel (located' p_pat) pats
953+ TuplePat NoExtField pats boxing -> do
954+ let parens' =
705955 case boxing of
706− Boxed -> parens
707− Unboxed -> parensHash
708− f $ velt (withSep comma (located' p_pat) pats)
709− SumPat NoExt pat _ _ -> do
710− -- XXX I'm not sure about this one.
711− 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)
712961 ConPatIn pat details ->
713962 case details of
714963 PrefixCon xs -> sitcc $ do
715964 p_rdrName pat
716965 unless (null xs) $ do
717966 breakpoint
718− inci $ velt' (located' p_pat <$> xs)
967+ inci . sitcc $ sep breakpoint (sitcc . located' p_pat) xs
719968 RecCon (HsRecFields fields dotdot) -> do
720969 p_rdrName pat
721970 breakpoint
722971 let f = \case
723972 Nothing -> txt ".."
724973 Just x -> located x p_pat_hsRecField
725− inci . braces . velt . withSep comma f $ case dotdot of
726− Nothing -> Just <$> fields
727− Just n -> (Just <$> take n fields) ++ [Nothing]
728− InfixCon x y -> do
729− located x p_pat
730− space
731− p_rdrName pat
732− breakpoint
733− 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
734986 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
735− ViewPat NoExt expr pat -> sitcc $ do
987+ ViewPat NoExtField expr pat -> sitcc $ do
736988 located expr p_hsExpr
737− txt " ->"
989+ space
990+ txt "->"
738991 breakpoint
739992 inci (located pat p_pat)
740− SplicePat NoExt splice -> p_hsSplice splice
741− LitPat NoExt p -> atom p
742− NPat NoExt v _ _ -> located v (atom . ol_val)
743− 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
744997 p_rdrName n
745998 breakpoint
746999 inci $ do
747− txt "+ "
1000+ txt "+"
1001+ space
7481002 located k (atom . ol_val)
749− SigPat hswc pat -> do
1003+ SigPat NoExtField pat hswc -> do
7501004 located pat p_pat
7511005 p_typeAscription hswc
7521006 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
753− XPat NoExt -> notImplemented "XPat"
1007+ XPat x -> noExtCon x
7541008
7551009p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
7561010p_pat_hsRecField HsRecField {..} = do
7571011 located hsRecFieldLbl $ \x ->
7581012 p_rdrName (rdrNameFieldOcc x)
7591013 unless hsRecPun $ do
760− txt " ="
1014+ space
1015+ equals
7611016 breakpoint
7621017 inci (located hsRecFieldArg p_pat)
7631018
1019+p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
1020+p_unboxedSum s tag arity m = do
1021+ let before = tag - 1
1022+ after = arity - before - 1
1023+ args = replicate before Nothing <> [Just m] <> replicate after Nothing
1024+ f x =
1025+ case x :: Maybe (R ()) of
1026+ Nothing ->
1027+ space
1028+ Just m' -> do
1029+ space
1030+ m'
1031+ space
1032+ parensHash s $ sep (txt "|") f args
1033+
7641034p_hsSplice :: HsSplice GhcPs -> R ()
7651035p_hsSplice = \case
766− HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
767− HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
768− 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
7691039 txt "["
7701040 p_rdrName (L srcSpan quoterName)
7711041 txt "|"
772− -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
773− -- 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.
7741044 atom str
7751045 txt "|]"
7761046 HsSpliced {} -> notImplemented "HsSpliced"
777− XSplice {} -> notImplemented "XSplice"
1047+ HsSplicedT {} -> notImplemented "HsSplicedT"
1048+ XSplice x -> noExtCon x
7781049
779−p_hsSpliceTH
780− :: Bool -- ^ Typed splice?
781− -> LHsExpr GhcPs -- ^ Splice expression
782− -> SpliceDecoration -- ^ Splice decoration
783− -> R ()
1050+p_hsSpliceTH ::
1051+ -- | Typed splice?
1052+ Bool ->
1053+ -- | Splice expression
1054+ LHsExpr GhcPs ->
1055+ -- | Splice decoration
1056+ SpliceDecoration ->
1057+ R ()
7841058p_hsSpliceTH isTyped expr = \case
7851059 HasParens -> do
7861060 txt decoSymbol
787− parens (located expr (sitcc . p_hsExpr))
1061+ parens N (located expr (sitcc . p_hsExpr))
7881062 HasDollar -> do
7891063 txt decoSymbol
7901064 located expr (sitcc . p_hsExpr)
791− NoParens -> do
1065+ NoParens ->
7921066 located expr (sitcc . p_hsExpr)
7931067 where
7941068 decoSymbol = if isTyped then "$$" else "$"
7951069
7961070p_hsBracket :: HsBracket GhcPs -> R ()
7971071p_hsBracket = \case
798− ExpBr NoExt expr -> quote "e" (located expr p_hsExpr)
799− PatBr NoExt pat -> quote "p" (located pat p_pat)
800− DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
801− DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
802− TypBr NoExt ty -> quote "t" (located ty p_hsType)
803− VarBr NoExt isSingleQuote name -> do
1072+ ExpBr NoExtField expr -> do
1073+ anns <- getEnclosingAnns
1074+ let name = case anns of
1075+ AnnOpenEQ : _ -> ""
1076+ _ -> "e"
1077+ quote name (located expr p_hsExpr)
1078+ PatBr NoExtField pat -> located pat (quote "p" . p_pat)
1079+ DecBrL NoExtField decls -> quote "d" (p_hsDecls Free decls)
1080+ DecBrG NoExtField _ -> notImplemented "DecBrG" -- result of renamer
1081+ TypBr NoExtField ty -> quote "t" (located ty p_hsType)
1082+ VarBr NoExtField isSingleQuote name -> do
8041083 txt (bool "''" "'" isSingleQuote)
805− p_rdrName (noLoc name)
806− TExpBr NoExt expr -> do
1084+ -- HACK As you can see we use 'noLoc' here to be able to pass name into
1085+ -- 'p_rdrName' since the latter expects a "located" thing. The problem
1086+ -- is that 'VarBr' doesn't provide us with location of the name. This in
1087+ -- turn makes it impossible to detect if there are parentheses around
1088+ -- it, etc. So we have to add parentheses manually assuming they are
1089+ -- necessary for all operators.
1090+ let isOperator =
1091+ all
1092+ (\i -> isPunctuation i || isSymbol i)
1093+ (showOutputable (rdrNameOcc name))
1094+ && not (doesNotNeedExtraParens name)
1095+ wrapper = if isOperator then parens N else id
1096+ wrapper $ p_rdrName (noLoc name)
1097+ TExpBr NoExtField expr -> do
8071098 txt "[||"
8081099 breakpoint'
8091100 located expr p_hsExpr
8101101 breakpoint'
8111102 txt "||]"
812− XBracket {} -> notImplemented "XBracket"
1103+ XBracket x -> noExtCon x
8131104 where
8141105 quote :: Text -> R () -> R ()
8151106 quote name body = do
@@ -817,16 +1108,70 @@ p_hsBracket = \case
8171108 txt name
8181109 txt "|"
8191110 breakpoint'
820− body
821− breakpoint'
822− txt "|]"
1111+ inci $ do
1112+ dontUseBraces body
1113+ breakpoint'
1114+ txt "|]"
1115+
1116+-- Print the source text of a string literal while indenting
1117+-- gaps correctly.
1118+
1119+p_stringLit :: String -> R ()
1120+p_stringLit src =
1121+ let s = splitGaps src
1122+ singleLine =
1123+ txt $ Text.pack (mconcat s)
1124+ multiLine =
1125+ sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126+ in vlayout singleLine multiLine
1127+ where
1128+ -- Split a string on gaps (backslash delimited whitespaces)
1129+ --
1130+ -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131+ splitGaps :: String -> [String]
1132+ splitGaps "" = []
1133+ splitGaps s =
1134+ let -- A backslash and a whitespace starts a "gap"
1135+ p (Just '\\', _, _) = True
1136+ p (_, '\\', Just c) | ghcSpace c = False
1137+ p _ = True
1138+ in case span p (zipPrevNext s) of
1139+ (l, r) ->
1140+ let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141+ r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142+ in map orig l : splitGaps r'
1143+ -- GHC's definition of whitespaces in strings
1144+ -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145+ ghcSpace :: Char -> Bool
1146+ ghcSpace c = c <= '\x7f' && is_space c
1147+ -- Add backslashes to the inner side of the strings
1148+ --
1149+ -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150+ backslashes :: [String] -> [String]
1151+ backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152+ backslashes xs = xs
1153+ -- Attaches previous and next items to each list element
1154+ zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1155+ zipPrevNext xs =
1156+ let z =
1157+ zip
1158+ (zip (Nothing : map Just xs) xs)
1159+ (map Just (tail xs) ++ repeat Nothing)
1160+ in map (\((p, x), n) -> (p, x, n)) z
1161+ orig (_, x, _) = x
8231162
8241163----------------------------------------------------------------------------
8251164-- Helpers
8261165
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+
8271173-- | Append each element in both lists with semigroups. If one list is shorter
8281174-- than the other, return the rest of the longer list unchanged.
829−
8301175liftAppend :: Semigroup a => [a] -> [a] -> [a]
8311176liftAppend [] [] = []
8321177liftAppend [] (y : ys) = y : ys
@@ -834,15 +1179,15 @@ liftAppend (x : xs) [] = x : xs
8341179liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
8351180
8361181getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
837−getGRHSSpan (GRHS NoExt _ body) = getLoc body
838−getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1182+getGRHSSpan (GRHS NoExtField guards body) =
1183+ combineSrcSpans' $ getLoc body :| map getLoc guards
1184+getGRHSSpan (XGRHS x) = noExtCon x
8391185
8401186-- | Place a thing that may have a hanging form. This function handles how
8411187-- to separate it from preceding expressions and whether to bump indentation
8421188-- depending on what sort of expression we have.
843−
8441189placeHanging :: Placement -> R () -> R ()
845−placeHanging placement m = do
1190+placeHanging placement m =
8461191 case placement of
8471192 Hanging -> do
8481193 space
@@ -853,49 +1198,165 @@ placeHanging placement m = do
8531198
8541199-- | Check if given block contains single expression which has a hanging
8551200-- form.
856−
857−blockPlacement
858− :: (body -> Placement)
859− -> [LGRHS GhcPs (Located body)]
860− -> Placement
861−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
8621206blockPlacement _ _ = Normal
8631207
8641208-- | Check if given command has a hanging form.
865−
8661209cmdPlacement :: HsCmd GhcPs -> Placement
8671210cmdPlacement = \case
868− HsCmdLam NoExt _ -> Hanging
869− HsCmdCase NoExt _ _ -> Hanging
870− HsCmdDo NoExt _ -> Hanging
1211+ HsCmdLam NoExtField _ -> Hanging
1212+ HsCmdCase NoExtField _ _ -> Hanging
1213+ HsCmdDo NoExtField _ -> Hanging
8711214 _ -> Normal
8721215
8731216cmdTopPlacement :: HsCmdTop GhcPs -> Placement
8741217cmdTopPlacement = \case
875− HsCmdTop NoExt (L _ x) -> cmdPlacement x
876− XCmdTop {} -> notImplemented "XCmdTop"
1218+ HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219+ XCmdTop x -> noExtCon x
8771220
8781221-- | Check if given expression has a hanging form.
879−
8801222exprPlacement :: HsExpr GhcPs -> Placement
8811223exprPlacement = \case
882− HsLam NoExt _ -> Hanging
883− HsLamCase NoExt _ -> Hanging
884− HsCase NoExt _ _ -> Hanging
885− HsDo NoExt DoExpr _ -> Hanging
886− HsDo NoExt MDoExpr _ -> Hanging
887− RecordCon NoExt _ _ -> Hanging
888− HsProc NoExt (L s _) _ ->
889− -- Indentation breaks if pattern is longer than one line and left hanging.
890− -- Consequentally, once apply hanging when it is safe.
891− if isOneLineSpan s
892− then Hanging
893− else Normal
1224+ -- Only hang lambdas with single line parameter lists
1225+ HsLam NoExtField mg -> case mg of
1226+ MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
1227+ | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
1228+ Hanging
1229+ _ -> Normal
1230+ HsLamCase NoExtField _ -> Hanging
1231+ HsCase NoExtField _ _ -> Hanging
1232+ HsDo NoExtField DoExpr _ -> Hanging
1233+ HsDo NoExtField MDoExpr _ -> Hanging
1234+ OpApp NoExtField _ op y ->
1235+ case (fmap getOpNameStr . getOpName . unLoc) op of
1236+ Just "$" -> exprPlacement (unLoc y)
1237+ _ -> Normal
1238+ HsApp NoExtField _ y -> exprPlacement (unLoc y)
1239+ HsProc NoExtField p _ ->
1240+ -- Indentation breaks if pattern is longer than one line and left
1241+ -- hanging. Consequently, only apply hanging when it is safe.
1242+ if isOneLineSpan (getLoc p)
1243+ then Hanging
1244+ else Normal
8941245 _ -> Normal
8951246
8961247withGuards :: [LGRHS GhcPs (Located body)] -> Bool
8971248withGuards = any (checkOne . unLoc)
8981249 where
8991250 checkOne :: GRHS GhcPs (Located body) -> Bool
900− checkOne (GRHS NoExt [] _) = False
1251+ checkOne (GRHS NoExtField [] _) = False
9011252 checkOne _ = True
1253+
1254+exprOpTree :: LHsExpr GhcPs -> OpTree (LHsExpr GhcPs) (LHsExpr GhcPs)
1255+exprOpTree (L _ (OpApp NoExtField x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
1256+exprOpTree n = OpNode n
1257+
1258+getOpName :: HsExpr GhcPs -> Maybe RdrName
1259+getOpName = \case
1260+ HsVar NoExtField (L _ a) -> Just a
1261+ _ -> Nothing
1262+
1263+getOpNameStr :: RdrName -> String
1264+getOpNameStr = occNameString . rdrNameOcc
1265+
1266+p_exprOpTree ::
1267+ -- | Bracket style to use
1268+ BracketStyle ->
1269+ OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) ->
1270+ R ()
1271+p_exprOpTree s (OpNode x) = located x (p_hsExpr' s)
1272+p_exprOpTree s (OpBranch x op y) = do
1273+ -- If the beginning of the first argument and the second argument are on
1274+ -- the same line, and the second argument has a hanging form, use hanging
1275+ -- placement.
1276+ let placement =
1277+ if isOneLineSpan
1278+ (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1279+ then case y of
1280+ OpNode (L _ n) -> exprPlacement n
1281+ _ -> Normal
1282+ else Normal
1283+ -- Distinguish holes used in infix notation.
1284+ -- eg. '1 _foo 2' and '1 `_foo` 2'
1285+ opWrapper = case unLoc op of
1286+ HsUnboundVar NoExtField _ -> backticks
1287+ _ -> id
1288+ layout <- getLayout
1289+ let ub = case layout of
1290+ SingleLine -> useBraces
1291+ MultiLine -> case placement of
1292+ Hanging -> useBraces
1293+ Normal -> dontUseBraces
1294+ opNameStr = (fmap getOpNameStr . getOpName . unLoc) op
1295+ gotDollar = opNameStr == Just "$"
1296+ gotColon = opNameStr == Just ":"
1297+ gotRecordDot = isRecordDot (unLoc op) (opTreeLoc y)
1298+ lhs =
1299+ switchLayout [opTreeLoc x] $
1300+ p_exprOpTree s x
1301+ p_op = located op (opWrapper . p_hsExpr)
1302+ p_y = switchLayout [opTreeLoc y] (p_exprOpTree N y)
1303+ isSection = case (opTreeLoc x, getLoc op) of
1304+ (RealSrcSpan treeSpan, RealSrcSpan opSpan) ->
1305+ srcSpanEndCol treeSpan /= srcSpanStartCol opSpan
1306+ _ -> False
1307+ isDoBlock = \case
1308+ OpNode (L _ HsDo {}) -> True
1309+ _ -> False
1310+ useRecordDot' <- useRecordDot
1311+ if
1312+ | gotColon -> do
1313+ lhs
1314+ space
1315+ p_op
1316+ case placement of
1317+ Hanging -> do
1318+ space
1319+ p_y
1320+ Normal -> do
1321+ breakpoint
1322+ inciIf (isDoBlock y) p_y
1323+ | gotDollar
1324+ && isOneLineSpan (opTreeLoc x)
1325+ && placement == Normal -> do
1326+ useBraces lhs
1327+ space
1328+ p_op
1329+ breakpoint
1330+ inci p_y
1331+ | useRecordDot' && gotRecordDot -> do
1332+ lhs
1333+ when isSection space
1334+ p_op
1335+ p_y
1336+ | otherwise -> do
1337+ ub lhs
1338+ placeHanging placement $ do
1339+ p_op
1340+ space
1341+ p_y
1342+
1343+-- | Return 'True' if given expression is a record-dot operator expression.
1344+isRecordDot ::
1345+ -- | Operator expression
1346+ HsExpr GhcPs ->
1347+ -- | Span of the expression on the right-hand side of the operator
1348+ SrcSpan ->
1349+ Bool
1350+isRecordDot op (RealSrcSpan ySpan) = case op of
1351+ HsVar NoExtField (L (RealSrcSpan opSpan) opName) ->
1352+ (getOpNameStr opName == ".") && (srcSpanEndCol opSpan == srcSpanStartCol ySpan)
1353+ _ -> False
1354+isRecordDot _ _ = False
1355+
1356+-- | Get annotations for the enclosing element.
1357+getEnclosingAnns :: R [AnnKeywordId]
1358+getEnclosingAnns = do
1359+ e <- getEnclosingSpan (const True)
1360+ case e of
1361+ Nothing -> return []
1362+ Just e' -> getAnns (RealSrcSpan e')