@@ -1,43 +1,36 @@
1−{-# LANGUAGE LambdaCase #-}
2−{-# LANGUAGE MultiWayIf #-}
1+{-# LANGUAGE LambdaCase #-}
32{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE RecordWildCards #-}
5−{-# LANGUAGE TypeApplications #-}
3+{-# LANGUAGE RecordWildCards #-}
64
75module Ormolu.Printer.Meat.Declaration.Value
8− ( p_valDecl,
9− p_pat,
10− p_hsExpr,
11− p_hsSplice,
12− p_stringLit,
6+ ( p_valDecl
7+ , p_pat
8+ , p_hsExpr
9+ , p_hsSplice
1310 )
1411where
1512
1613import Bag (bagToList)
1714import BasicTypes
1815import Control.Monad
19−import Ctype (is_space)
2016import Data.Bool (bool)
2117import Data.Char (isPunctuation, isSymbol)
2218import Data.Data hiding (Infix, Prefix)
23−import Data.Functor ((<&>))
2419import Data.List (intersperse, sortOn)
25−import Data.List.NonEmpty (NonEmpty (..), (<|))
26−import qualified Data.List.NonEmpty as NE
20+import Data.List.NonEmpty (NonEmpty ((:|)))
2721import Data.Text (Text)
28−import qualified Data.Text as Text
2922import GHC
30−import OccName (occNameString)
3123import Ormolu.Printer.Combinators
32−import Ormolu.Printer.Internal
3324import Ormolu.Printer.Meat.Common
34−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
3525import Ormolu.Printer.Meat.Declaration.Signature
3626import Ormolu.Printer.Meat.Type
37−import Ormolu.Printer.Operators
3827import Ormolu.Utils
28+import Outputable (Outputable (..))
29+import RdrName (rdrNameOcc)
30+import SrcLoc (combineSrcSpans, isOneLineSpan)
31+import qualified Data.List.NonEmpty as NE
32+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
3933
40−-- | Style of a group of equations.
4134data MatchGroupStyle
4235 = Function (Located RdrName)
4336 | PatternBind
@@ -45,62 +38,55 @@ data MatchGroupStyle
4538 | Lambda
4639 | LambdaCase
4740
48−-- | Style of equations in a group.
4941data GroupStyle
5042 = EqualSign
5143 | RightArrow
5244
5345-- | Expression placement. This marks the places where expressions that
5446-- implement handing forms may use them.
47+
5548data Placement
56− = -- | Multi-line layout should cause
57− -- insertion of a newline and indentation
58− -- bump
59− Normal
60− | -- | Expressions that have hanging form
61− -- should use it and avoid bumping one level
62− -- of indentation
63− Hanging
64− deriving (Eq, Show)
49+ = Normal -- ^ Multi-line layout should cause
50+ -- insertion of a newline and indentation
51+ -- bump
52+ | Hanging -- ^ Expressions that have hanging form
53+ -- should use it and avoid bumping one level
54+ -- of indentation
6555
6656p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
6757p_valDecl = \case
68− FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
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 NoSrcStrict [pat] grhss
7060 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
7161 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
72− PatSynBind NoExtField psb -> p_patSynBind psb
73− XHsBindsLR x -> noExtCon x
62+ PatSynBind NoExt psb -> p_patSynBind psb
63+ XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
7464
75−p_funBind ::
76− Located RdrName ->
77− MatchGroup GhcPs (LHsExpr GhcPs) ->
78− R ()
65+p_funBind
66+ :: Located RdrName
67+ -> MatchGroup GhcPs (LHsExpr GhcPs)
68+ -> R ()
7969p_funBind name = p_matchGroup (Function name)
8070
81−p_matchGroup ::
82− MatchGroupStyle ->
83− MatchGroup GhcPs (LHsExpr GhcPs) ->
84− R ()
71+p_matchGroup
72+ :: MatchGroupStyle
73+ -> MatchGroup GhcPs (LHsExpr GhcPs)
74+ -> R ()
8575p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
8676
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
77+p_matchGroup'
78+ :: Data body
79+ => (body -> Placement)
80+ -> (body -> R ())
81+ -> MatchGroupStyle
82+ -> MatchGroup GhcPs (Located body)
83+ -> R ()
84+p_matchGroup' placer pretty style MG {..} = do
9985 let ob = case style of
10086 Case -> id
10187 LambdaCase -> id
10288 _ -> dontUseBraces
103− -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
89+ -- NOTE since we are forcing braces on 'sepSemi' based on 'ob', we have to
10490 -- restore the brace state inside the sepsemi.
10591 ub <- bool dontUseBraces useBraces <$> canUseBraces
10692 ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
@@ -108,14 +94,14 @@ p_matchGroup' placer render style MG {..} = do
10894 p_Match m@Match {..} =
10995 p_match'
11096 placer
111− render
97+ pretty
11298 (adjustMatchGroupStyle m style)
11399 (isInfixMatch m)
114100 (matchStrictness m)
115101 m_pats
116102 m_grhss
117− p_Match (XMatch x) = noExtCon x
118−p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
103+ p_Match _ = notImplemented "XMatch"
104+p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
119105
120106-- | Function id obtained through pattern matching on 'FunBind' should not
121107-- be used to print the actual equations because the different ‘RdrNames’
@@ -123,10 +109,11 @@ p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
123109-- and paretheses) associated with them. It is necessary to use per-equation
124110-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
125111-- name inside of 'Function' accordingly.
126−adjustMatchGroupStyle ::
127− Match GhcPs body ->
128− MatchGroupStyle ->
129− MatchGroupStyle
112+
113+adjustMatchGroupStyle
114+ :: Match GhcPs body
115+ -> MatchGroupStyle
116+ -> MatchGroupStyle
130117adjustMatchGroupStyle m = \case
131118 Function _ -> (Function . mc_fun . m_ctxt) m
132119 style -> style
@@ -134,43 +121,31 @@ adjustMatchGroupStyle m = \case
134121matchStrictness :: Match id body -> SrcStrictness
135122matchStrictness match =
136123 case m_ctxt match of
137− FunRhs {mc_strictness = s} -> s
124+ FunRhs{mc_strictness=s} -> s
138125 _ -> NoSrcStrict
139126
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 ()
127+p_match
128+ :: MatchGroupStyle
129+ -> Bool -- ^ Is this an infix match?
130+ -> SrcStrictness -- ^ Strictness prefix (FunBind)
131+ -> [LPat GhcPs]
132+ -> GRHSs GhcPs (LHsExpr GhcPs)
133+ -> R ()
152134p_match = p_match' exprPlacement p_hsExpr
153135
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
136+p_match'
137+ :: Data body
138+ => (body -> Placement)
139+ -> (body -> R ())
140+ -> MatchGroupStyle
141+ -> Bool -- ^ Is this an infix match?
142+ -> SrcStrictness -- ^ Strictness prefix (FunBind)
143+ -> [LPat GhcPs]
144+ -> GRHSs GhcPs (Located body)
145+ -> R ()
146+p_match' placer pretty style isInfix strictness m_pats m_grhss = do
147+ -- NOTE Normally, since patterns may be placed in a multi-line layout, it
148+ -- is necessary to bump indentation for the pattern group so it's more
174149 -- indented than function name. This in turn means that indentation for
175150 -- the body should also be bumped. Normally this would mean that bodies
176151 -- would start with two indentation steps applied, which is ugly, so we
@@ -180,24 +155,23 @@ p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
180155 NoSrcStrict -> return ()
181156 SrcStrict -> txt "!"
182157 SrcLazy -> txt "~"
183− indentBody <- case NE.nonEmpty m_pats of
184− Nothing ->
185− False <$ case style of
186− Function name -> p_rdrName name
187− _ -> return ()
158+ inci' <- case NE.nonEmpty m_pats of
159+ Nothing -> id <$ case style of
160+ Function name -> p_rdrName name
161+ _ -> return ()
188162 Just ne_pats -> do
189− let combinedSpans = case style of
190− Function name -> combineSrcSpans (getLoc name) patSpans
191− _ -> patSpans
192− patSpans = combineSrcSpans' (getLoc <$> ne_pats)
193− indentBody = not (isOneLineSpan combinedSpans)
163+ let combinedSpans = combineSrcSpans' $
164+ getLoc <$> ne_pats
165+ inci' = if isOneLineSpan combinedSpans
166+ then id
167+ else inci
194168 switchLayout [combinedSpans] $ do
195169 let stdCase = sep breakpoint (located' p_pat) m_pats
196170 case style of
197171 Function name ->
198172 p_infixDefHelper
199173 isInfix
200− indentBody
174+ inci'
201175 (p_rdrName name)
202176 (located' p_pat <$> m_pats)
203177 PatternBind -> stdCase
@@ -208,44 +182,49 @@ p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
208182 BangPat _ _ -> True
209183 SplicePat _ _ -> True
210184 _ -> False
211− txt "\\"
212− when needsSpace space
185+ txt (if needsSpace then "\\ " else "\\")
213186 sitcc stdCase
214187 LambdaCase -> stdCase
215− return indentBody
216− let -- Calculate position of end of patterns. This is useful when we decide
217− -- about putting certain constructions in hanging positions.
218− endOfPats = case NE.nonEmpty m_pats of
219− Nothing -> case style of
220− Function name -> Just (getLoc name)
221− _ -> Nothing
222− Just pats -> (Just . getLoc . NE.last) pats
223− isCase = \case
224− Case -> True
225− LambdaCase -> True
226− _ -> False
188+ return inci'
189+ let
190+ -- Calculate position of end of patterns. This is useful when we decide
191+ -- about putting certain constructions in hanging positions.
192+ endOfPats = case NE.nonEmpty m_pats of
193+ Nothing -> case style of
194+ Function name -> (Just . srcSpanEnd . getLoc) name
195+ _ -> Nothing
196+ Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
197+ isCase = \case
198+ Case -> True
199+ LambdaCase -> True
200+ _ -> False
201+ let GRHSs {..} = m_grhss
227202 hasGuards = withGuards grhssGRHSs
228− grhssSpan =
229− combineSrcSpans' $
230− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
231− patGrhssSpan =
232− maybe
233− grhssSpan
234− (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
235− endOfPats
203+ unless (length grhssGRHSs > 1) $ do
204+ case style of
205+ Function _ | hasGuards -> return ()
206+ Function _ -> txt " ="
207+ PatternBind -> txt " ="
208+ s | isCase s && hasGuards -> return ()
209+ _ -> txt " ->"
210+ let grhssSpan = combineSrcSpans' $
211+ getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
212+ patGrhssSpan = maybe grhssSpan
213+ (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
236214 placement =
237215 case endOfPats of
238216 Nothing -> blockPlacement placer grhssGRHSs
239217 Just spn ->
240− if onTheSameLine spn grhssSpan
218+ if isOneLineSpan
219+ (mkSrcSpan spn (srcSpanStart grhssSpan))
241220 then blockPlacement placer grhssGRHSs
242221 else Normal
243222 p_body = do
244223 let groupStyle =
245224 if isCase style && hasGuards
246− then RightArrow
247− else EqualSign
248− sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
225+ then RightArrow
226+ else EqualSign
227+ sep newline (located' (p_grhs' pretty groupStyle)) grhssGRHSs
249228 p_where = do
250229 let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
251230 unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
@@ -253,211 +232,166 @@ p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
253232 txt "where"
254233 unless whereIsEmpty breakpoint
255234 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 "->"
235+ inci' $ do
264236 switchLayout [patGrhssSpan] $
265237 placeHanging placement p_body
266238 inci p_where
267−p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
268239
269240p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
270−p_grhs = p_grhs' exprPlacement p_hsExpr
271−
272−p_grhs' ::
273− Data body =>
274− -- | How to get body placement
275− (body -> Placement) ->
276− -- | How to print body
277− (body -> R ()) ->
278− GroupStyle ->
279− GRHS GhcPs (Located body) ->
280− R ()
281−p_grhs' placer render style (GRHS NoExtField guards body) =
241+p_grhs = p_grhs' p_hsExpr
242+
243+p_grhs'
244+ :: Data body
245+ => (body -> R ())
246+ -> GroupStyle
247+ -> GRHS GhcPs (Located body)
248+ -> R ()
249+p_grhs' pretty style (GRHS NoExt guards body) =
282250 case guards of
283251 [] -> p_body
284252 xs -> do
285− txt "|"
286− space
287− sitcc (sep commaDel (sitcc . located' p_stmt) xs)
253+ txt "| "
254+ sitcc (sep (comma >> breakpoint) (sitcc . located' p_stmt) xs)
288255 space
289− inci $ case style of
290− EqualSign -> equals
291− RightArrow -> txt "->"
292− placeHanging placement p_body
256+ txt $ case style of
257+ EqualSign -> "="
258+ RightArrow -> "->"
259+ breakpoint
260+ inci p_body
293261 where
294− placement =
295− case endOfGuards of
296− Nothing -> placer (unLoc body)
297− Just spn ->
298− if onTheSameLine spn (getLoc body)
299− then placer (unLoc body)
300− else Normal
301− endOfGuards =
302− case NE.nonEmpty guards of
303− Nothing -> Nothing
304− Just gs -> (Just . getLoc . NE.last) gs
305− p_body = located body render
306−p_grhs' _ _ _ (XGRHS x) = noExtCon x
262+ p_body = located body pretty
263+p_grhs' _ _ (XGRHS NoExt) = notImplemented "XGRHS"
307264
308265p_hsCmd :: HsCmd GhcPs -> R ()
309266p_hsCmd = \case
310− HsCmdArrApp NoExtField body input arrType _ -> do
267+ HsCmdArrApp NoExt body input arrType _ -> do
311268 located body p_hsExpr
312− breakpoint
313− inci $ do
314− case arrType of
315− HsFirstOrderApp -> txt "-<"
316− HsHigherOrderApp -> txt "-<<"
317− placeHanging (exprPlacement (unLoc input)) $
318− located input p_hsExpr
319− HsCmdArrForm NoExtField form Prefix _ cmds -> banana $ do
269+ txt $ case arrType of
270+ HsFirstOrderApp -> " -<"
271+ HsHigherOrderApp -> " -<<"
272+ placeHanging (exprPlacement (unLoc input)) $
273+ located input p_hsExpr
274+ HsCmdArrForm NoExt form Prefix _ cmds -> banana $ sitcc $ do
320275 located form p_hsExpr
321276 unless (null cmds) $ do
322277 breakpoint
323278 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
324− HsCmdArrForm NoExtField form Infix _ [left, right] -> do
279+ HsCmdArrForm NoExt form Infix _ [left, right] -> do
325280 located left p_hsCmdTop
326281 space
327282 located form p_hsExpr
328283 placeHanging (cmdTopPlacement (unLoc right)) $
329284 located right p_hsCmdTop
330− HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
285+ HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
331286 HsCmdApp {} ->
332287 -- XXX Does this ever occur in the syntax tree? It does not seem like it
333288 -- does. Open an issue and ping @yumiova if this ever occurs in output.
334289 notImplemented "HsCmdApp"
335− HsCmdLam NoExtField mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
336− HsCmdPar NoExtField c -> parens N (located c p_hsCmd)
337− HsCmdCase NoExtField e mgroup ->
338− p_case cmdPlacement p_hsCmd e mgroup
339− HsCmdIf NoExtField _ if' then' else' ->
340− p_if cmdPlacement p_hsCmd if' then' else'
341− HsCmdLet NoExtField localBinds c ->
342− p_let p_hsCmd localBinds c
343− HsCmdDo NoExtField es -> do
290+ HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
291+ HsCmdPar NoExt c -> parens (located c p_hsCmd)
292+ HsCmdCase NoExt e mgroup -> do
293+ txt "case "
294+ located e p_hsExpr
295+ txt " of"
296+ breakpoint
297+ inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
298+ HsCmdIf NoExt _ if' then' else' -> do
299+ txt "if "
300+ located if' p_hsExpr
301+ breakpoint
302+ txt "then"
303+ located then' $ \x -> do
304+ breakpoint
305+ inci (p_hsCmd x)
306+ breakpoint
307+ txt "else"
308+ located else' $ \x -> do
309+ breakpoint
310+ inci (p_hsCmd x)
311+ HsCmdLet NoExt localBinds c -> do
312+ txt "let "
313+ sitcc (located localBinds p_hsLocalBinds)
314+ breakpoint
315+ txt "in "
316+ sitcc (located c p_hsCmd)
317+ HsCmdDo NoExt es -> do
344318 txt "do"
345319 newline
346− inci . located es $
347− sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
320+ inci (located es (sitcc . sep newline (located' (sitcc . p_stmt' p_hsCmd))))
348321 HsCmdWrap {} -> notImplemented "HsCmdWrap"
349− XCmd x -> noExtCon x
322+ XCmd {} -> notImplemented "XCmd"
350323
351324p_hsCmdTop :: HsCmdTop GhcPs -> R ()
352325p_hsCmdTop = \case
353− HsCmdTop NoExtField cmd -> located cmd p_hsCmd
354− XCmdTop x -> noExtCon x
355−
356−-- | Render an expression preserving blank lines between such consecutive
357−-- expressions found in the original source code.
358−withSpacing ::
359− -- | Rendering function
360− (a -> R ()) ->
361− -- | Entity to render
362− Located a ->
363− R ()
364−withSpacing f l = located l $ \x -> do
365− case getLoc l of
366− UnhelpfulSpan _ -> f x
367− RealSrcSpan currentSpn -> do
368− getSpanMark >>= \case
369− -- Spacing before comments will be handled by the code
370− -- that prints comments, so we just have to deal with
371− -- blank lines between statements here.
372− Just (StatementSpan lastSpn) ->
373− if srcSpanStartLine currentSpn > srcSpanEndLine lastSpn + 1
374− then newline
375− else return ()
376− _ -> return ()
377− f x
378− -- In some cases the (f x) expression may insert a new mark. We want
379− -- to be careful not to override comment marks.
380− getSpanMark >>= \case
381− Just (HaddockSpan _ _) -> return ()
382− Just (CommentSpan _) -> return ()
383− _ -> setSpanMark (StatementSpan currentSpn)
326+ HsCmdTop NoExt cmd -> located cmd p_hsCmd
327+ XCmdTop {} -> notImplemented "XHsCmdTop"
384328
385329p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
386−p_stmt = p_stmt' exprPlacement p_hsExpr
387−
388−p_stmt' ::
389− Data body =>
390− -- | Placer
391− (body -> Placement) ->
392− -- | Render
393− (body -> R ()) ->
394− -- | Statement to render
395− Stmt GhcPs (Located body) ->
396− R ()
397−p_stmt' placer render = \case
398− LastStmt NoExtField body _ _ -> located body render
399− BindStmt NoExtField p f _ _ -> do
400− located p p_pat
330+p_stmt = p_stmt' p_hsExpr
331+
332+p_stmt'
333+ :: Data body
334+ => (body -> R ())
335+ -> Stmt GhcPs (Located body)
336+ -> R ()
337+p_stmt' pretty = \case
338+ LastStmt NoExt body _ _ -> located body pretty
339+ BindStmt NoExt l f _ _ -> do
340+ located l p_pat
401341 space
402342 txt "<-"
403− let loc = getLoc p
404− placement =
405− case f of
406− L l' x ->
407− if isOneLineSpan
408− (mkSrcSpan (srcSpanEnd loc) (srcSpanStart l'))
409− then placer x
410− else Normal
411− switchLayout [loc, getLoc f] $
412− placeHanging placement (located f render)
343+ breakpoint
344+ inci (located f pretty)
413345 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
414− BodyStmt NoExtField body _ _ -> located body render
415− LetStmt NoExtField binds -> do
416− txt "let"
417− space
346+ BodyStmt NoExt body _ _ -> located body pretty
347+ LetStmt NoExt binds -> do
348+ txt "let "
418349 sitcc $ located binds p_hsLocalBinds
419350 ParStmt {} ->
420− -- 'ParStmt' should always be eliminated in 'gatherStmt' already, such
421− -- that it never occurs in 'p_stmt''. Consequently, handling it here
422− -- would be redundant.
351+ -- NOTE 'ParStmt' should always be eliminated in 'gatherStmt' already,
352+ -- such that it never occurs in 'p_stmt''. Consequently, handling it
353+ -- here would be redundant.
423354 notImplemented "ParStmt"
424− TransStmt {..} ->
425− -- 'TransStmt' only needs to account for render printing itself, since
426− -- pretty printing of relevant statements (e.g., in 'trS_stmts') is
427− -- handled through 'gatherStmt'.
355+ TransStmt {..} -> do
356+ -- NOTE 'TransStmt' only needs to account for pretty printing itself,
357+ -- since pretty printing of relevant statements (e.g., in 'trS_stmts')
358+ -- is handled through 'gatherStmt'.
428359 case (trS_form, trS_by) of
429− (ThenForm, Nothing) -> do
360+ (ThenForm, Nothing) -> located trS_using $ \x -> do
430361 txt "then"
431362 breakpoint
432− inci $ located trS_using p_hsExpr
363+ inci (p_hsExpr x)
433364 (ThenForm, Just e) -> do
434− txt "then"
435− breakpoint
436− inci $ located trS_using p_hsExpr
437− breakpoint
438− txt "by"
365+ located trS_using $ \x -> do
366+ txt "then"
367+ breakpoint
368+ inci (p_hsExpr x)
439369 breakpoint
440− inci $ located e p_hsExpr
441− (GroupForm, Nothing) -> do
370+ located e $ \x -> do
371+ txt "by"
372+ breakpoint
373+ inci (p_hsExpr x)
374+ (GroupForm, Nothing) -> located trS_using $ \x -> do
442375 txt "then group using"
443376 breakpoint
444− inci $ located trS_using p_hsExpr
377+ inci (p_hsExpr x)
445378 (GroupForm, Just e) -> do
446− txt "then group by"
447− breakpoint
448− inci $ located e p_hsExpr
449− breakpoint
450− txt "using"
379+ located e $ \x -> do
380+ txt "then group by"
381+ breakpoint
382+ inci (p_hsExpr x)
451383 breakpoint
452− inci $ located trS_using p_hsExpr
384+ located trS_using $ \x -> do
385+ txt "using"
386+ breakpoint
387+ inci (p_hsExpr x)
453388 RecStmt {..} -> do
454− txt "rec"
455− space
456− sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457− XStmtLR c -> noExtCon c
389+ txt "rec "
390+ sitcc $ sepSemi (located' (p_stmt' pretty)) recS_stmts
391+ XStmtLR {} -> notImplemented "XStmtLR"
458392
459393gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
460−gatherStmt (L _ (ParStmt NoExtField block _ _)) =
394+gatherStmt (L _ (ParStmt NoExt block _ _)) =
461395 foldr ((<>) . gatherStmtBlock) [] block
462396gatherStmt (L s stmt@TransStmt {..}) =
463397 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
@@ -466,337 +400,266 @@ gatherStmt stmt = [[stmt]]
466400gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
467401gatherStmtBlock (ParStmtBlock _ stmts _ _) =
468402 foldr (liftAppend . gatherStmt) [] stmts
469−gatherStmtBlock (XParStmtBlock x) = noExtCon x
403+gatherStmtBlock XParStmtBlock {} = notImplemented "XParStmtBlock"
470404
471405p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
472406p_hsLocalBinds = \case
473− HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
474− -- When in a single-line layout, there is a chance that the inner
407+ HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
408+ let ssStart = either
409+ (srcSpanStart . getLoc)
410+ (srcSpanStart . getLoc)
411+ items =
412+ (Left <$> bagToList bag) ++ (Right <$> lsigs)
413+ p_item (Left x) = located x p_valDecl
414+ p_item (Right x) = located x p_sigDecl
415+ -- Assigns 'False' to the last element, 'True' to the rest.
416+ markInit :: [a] -> [(Bool, a)]
417+ markInit [] = []
418+ markInit (x:[]) = [(False, x)]
419+ markInit (x:xs) = (True, x) : markInit xs
420+ -- NOTE When in a single-line layout, there is a chance that the inner
475421 -- elements will also contain semicolons and they will confuse the
476422 -- parser. so we request braces around every element except the last.
477− br <- layoutToBraces <$> 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) ->
423+ br <- vlayout (return useBraces) (return id)
424+ sitcc $ sepSemi
425+ (\(m, i) -> (if m then br else id) $ p_item i)
426+ (markInit $ sortOn ssStart items)
427+ HsValBinds NoExt _ -> notImplemented "HsValBinds"
428+ HsIPBinds NoExt (IPBinds NoExt xs) ->
494429 -- Second argument of IPBind is always Left before type-checking.
495− let p_ipBind (IPBind NoExtField (Left name) expr) = do
430+ let p_ipBind (IPBind NoExt (Left name) expr) = do
496431 atom name
497− space
498− equals
432+ txt " ="
499433 breakpoint
500434 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
435+ p_ipBind _ = notImplemented "XHsIPBinds"
505436 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
437+ HsIPBinds NoExt _ -> notImplemented "HsIpBinds"
438+ EmptyLocalBinds NoExt -> return ()
439+ XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
440+
441+p_hsRecField
442+ :: (Data id, Outputable id)
443+ => HsRecField' id (LHsExpr GhcPs)
444+ -> R ()
445+p_hsRecField = \HsRecField {..} -> do
446+ located hsRecFieldLbl atom
515447 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)
448+ txt " ="
449+ let placement = exprPlacement (unLoc hsRecFieldArg)
450+ placeHanging placement $ located hsRecFieldArg p_hsExpr
523451
524−p_hsExpr :: HsExpr GhcPs -> R ()
525−p_hsExpr = p_hsExpr' N
452+p_hsTupArg :: HsTupArg GhcPs -> R ()
453+p_hsTupArg = \case
454+ Present NoExt x -> located x p_hsExpr
455+ Missing NoExt -> pure ()
456+ XTupArg {} -> notImplemented "XTupArg"
526457
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 ->
458+p_hsExpr :: HsExpr GhcPs -> R ()
459+p_hsExpr = \case
460+ HsVar NoExt name -> p_rdrName name
461+ HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
462+ HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
463+ HsRecFld NoExt x ->
533464 case x of
534− Unambiguous NoExtField name -> p_rdrName name
535− Ambiguous NoExtField name -> p_rdrName name
536− XAmbiguousFieldOcc xx -> noExtCon xx
537− HsOverLabel NoExtField _ v -> do
465+ Unambiguous NoExt name -> p_rdrName name
466+ Ambiguous NoExt name -> p_rdrName name
467+ XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
468+ HsOverLabel NoExt _ v -> do
538469 txt "#"
539470 atom v
540− HsIPVar NoExtField (HsIPName name) -> do
471+ HsIPVar NoExt (HsIPName name) -> do
541472 txt "?"
542473 atom name
543− HsOverLit NoExtField v -> atom (ol_val v)
544− HsLit NoExtField lit ->
545− case lit of
546− HsString (SourceText stxt) _ -> p_stringLit stxt
547− HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
548− r -> atom r
549− HsLam NoExtField mgroup ->
474+ HsOverLit NoExt v -> atom (ol_val v)
475+ HsLit NoExt lit -> atom lit
476+ HsLam NoExt mgroup ->
550477 p_matchGroup Lambda mgroup
551− HsLamCase NoExtField mgroup -> do
478+ HsLamCase NoExt mgroup -> do
552479 txt "\\case"
553− breakpoint
480+ newline
554481 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
482+ HsApp NoExt f x -> sitcc $ do
483+ located f p_hsExpr
484+ -- Second argument can be a `do` or `case` block with `-XBlockArguments`.
485+ placeHanging (exprPlacement (unLoc x)) $
486+ located x p_hsExpr
487+ HsAppType a e -> do
612488 located e p_hsExpr
613489 breakpoint
614490 inci $ do
615491 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 ()
621492 located (hswc_body a) p_hsType
622− OpApp NoExtField x op y -> do
623− let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
624− p_exprOpTree s (reassociateOpTree getOpName opTree)
625− NegApp NoExtField e _ -> do
626− txt "-"
627− space
493+ OpApp NoExt x op y -> do
494+ -- NOTE If the beginning of the first argument and the second argument
495+ -- are on the same line, and the second argument has a hanging form, use
496+ -- hanging placement.
497+ let placement =
498+ if isOneLineSpan
499+ (mkSrcSpan (srcSpanStart (getLoc x)) (srcSpanStart (getLoc y)))
500+ then exprPlacement (unLoc y)
501+ else Normal
502+ opWrapper = case unLoc op of
503+ EWildPat NoExt -> backticks
504+ _ -> id
505+ ub <- vlayout
506+ (return useBraces)
507+ (return $ case placement of
508+ Hanging -> useBraces
509+ Normal -> dontUseBraces)
510+ ub $ located x p_hsExpr
511+ placeHanging placement $ do
512+ located op (opWrapper . p_hsExpr)
513+ space
514+ located y p_hsExpr
515+ NegApp NoExt e _ -> do
516+ txt "- "
628517 located e p_hsExpr
629− HsPar NoExtField e ->
630− parens s (located e (dontUseBraces . p_hsExpr))
631− SectionL NoExtField x op -> do
518+ HsPar NoExt e -> parens (located e p_hsExpr)
519+ SectionL NoExt x op -> do
632520 located x p_hsExpr
633521 breakpoint
634522 inci (located op p_hsExpr)
635− SectionR NoExtField op x -> do
523+ SectionR NoExt op x -> do
636524 located op p_hsExpr
637− useRecordDot' <- useRecordDot
638− let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639− unless (useRecordDot' && isRecordDot') breakpoint
525+ breakpoint
640526 inci (located x p_hsExpr)
641− ExplicitTuple NoExtField args boxity ->
527+ ExplicitTuple NoExt args boxity -> do
642528 let isSection = any (isMissing . unLoc) args
643529 isMissing = \case
644− Missing NoExtField -> True
530+ Missing NoExt -> True
645531 _ -> False
646− p_arg = \case
647− Present NoExtField x -> located x p_hsExpr
648− Missing NoExtField -> pure ()
649− XTupArg x -> noExtCon x
650− p_larg = sitcc . located' p_arg
651− parens' =
532+ let parens' =
652533 case boxity of
653534 Boxed -> parens
654535 Unboxed -> parensHash
655− in if isSection
656− then
657− switchLayout [] . parens' s $
658− sep comma p_larg args
659− else
660− switchLayout (getLoc <$> args) . parens' s $
661− sep commaDel p_larg args
662− ExplicitSum NoExtField tag arity e ->
663− p_unboxedSum N tag arity (located e p_hsExpr)
664− HsCase NoExtField e mgroup ->
665− p_case exprPlacement p_hsExpr e mgroup
666− HsIf NoExtField _ if' then' else' ->
667− p_if exprPlacement p_hsExpr if' then' else'
668− HsMultiIf NoExtField guards -> do
536+ if isSection
537+ then switchLayout [] . parens' $
538+ sep comma (located' p_hsTupArg) args
539+ else switchLayout (getLoc <$> args) . parens' . sitcc $
540+ sep (comma >> breakpoint) (sitcc . located' p_hsTupArg) args
541+ ExplicitSum NoExt tag arity e ->
542+ p_unboxedSum tag arity (located e p_hsExpr)
543+ HsCase NoExt e mgroup -> do
544+ txt "case "
545+ located e p_hsExpr
546+ txt " of"
547+ breakpoint
548+ inci (p_matchGroup Case mgroup)
549+ HsIf NoExt _ if' then' else' -> do
550+ txt "if "
551+ located if' p_hsExpr
552+ breakpoint
553+ inci $ do
554+ txt "then"
555+ located then' $ \x ->
556+ placeHanging (exprPlacement x) (p_hsExpr x)
557+ breakpoint
558+ txt "else"
559+ located else' $ \x ->
560+ placeHanging (exprPlacement x) (p_hsExpr x)
561+ HsMultiIf NoExt guards -> do
669562 txt "if"
670563 breakpoint
671− inci . inci $ sep newline (located' (p_grhs RightArrow)) guards
672− HsLet NoExtField localBinds e ->
673− p_let p_hsExpr localBinds e
674− HsDo NoExtField ctx es -> do
564+ inci . sitcc $ sep newline (located' (p_grhs RightArrow)) guards
565+ HsLet NoExt localBinds e -> do
566+ txt "let "
567+ dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
568+ vlayout space (newline >> space)
569+ txt "in "
570+ sitcc (located e p_hsExpr)
571+ HsDo NoExt ctx es -> do
675572 let doBody header = do
676573 txt header
677574 breakpoint
678− ub <- layoutToBraces <$> getLayout
679− inci $
680− sepSemi
681− (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
682− (unLoc es)
683− compBody = brackets N . located es $ \xs -> do
684− let p_parBody =
685− sep
686− (breakpoint >> txt "|" >> space)
687− p_seqBody
688− p_seqBody =
689− sitcc
690− . sep
691− commaDel
692− (located' (sitcc . p_stmt))
575+ ub <- vlayout (return useBraces) (return id)
576+ inci $ sepSemi (located' (ub . p_stmt)) (unLoc es)
577+ compBody = brackets $ located es $ \xs -> do
578+ let p_parBody = sep
579+ (breakpoint >> txt "| ")
580+ p_seqBody
581+ p_seqBody = sitcc . sep
582+ (comma >> breakpoint)
583+ (located' (sitcc . p_stmt))
693584 stmts = init xs
694585 yield = last xs
695586 lists = foldr (liftAppend . gatherStmt) [] stmts
696587 located yield p_stmt
697588 breakpoint
698− txt "|"
699− space
589+ txt "| "
700590 p_parBody lists
701591 case ctx of
702592 DoExpr -> doBody "do"
703593 MDoExpr -> doBody "mdo"
704594 ListComp -> compBody
705595 MonadComp -> notImplemented "MonadComp"
706− ArrowExpr -> notImplemented "ArrowExpr"
596+ ArrowExpr -> notImplemented "ArrowExpr"
707597 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
708598 PatGuard _ -> notImplemented "PatGuard"
709599 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
710600 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
711601 ExplicitList _ _ xs ->
712− brackets s $
713− sep commaDel (sitcc . located' p_hsExpr) xs
602+ brackets . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_hsExpr) xs
714603 RecordCon {..} -> do
715604 located rcon_con_name atom
716605 breakpoint
717606 let HsRecFields {..} = rcon_flds
718− updName f =
719− (f :: HsRecField GhcPs (LHsExpr GhcPs))
720− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
721− FieldOcc _ n -> n
722− XFieldOcc x -> noExtCon x
723− }
724− fields = located' (p_hsRecField . updName) <$> rec_flds
607+ fields = located' p_hsRecField <$> rec_flds
725608 dotdot =
726609 case rec_dotdot of
727610 Just {} -> [txt ".."]
728611 Nothing -> []
729− inci . braces N $
730− sep commaDel sitcc (fields <> dotdot)
612+ inci . braces . sitcc $ sep (comma >> breakpoint) sitcc (fields <> dotdot)
731613 RecordUpd {..} -> do
732614 located rupd_expr p_hsExpr
733− useRecordDot' <- useRecordDot
734− let mrs sp = case getLoc sp of
735− RealSrcSpan r -> Just r
736− _ -> Nothing
737− let isPluginForm =
738− ((1 +) . srcSpanEndCol <$> mrs rupd_expr)
739− == (srcSpanStartCol <$> mrs (head rupd_flds))
740− unless (useRecordDot' && isPluginForm) breakpoint
741− let updName f =
742− (f :: HsRecUpdField GhcPs)
743− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
744− Ambiguous _ n -> n
745− Unambiguous _ n -> n
746− XAmbiguousFieldOcc x -> noExtCon x
747− }
748− inci . braces N $
749− sep
750− commaDel
751− (sitcc . located' (p_hsRecField . updName))
752− rupd_flds
753− ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
615+ breakpoint
616+ inci . braces . sitcc $
617+ sep (comma >> breakpoint) (sitcc . located' p_hsRecField) rupd_flds
618+ ExprWithTySig affix x -> sitcc $ do
754619 located x p_hsExpr
755− space
756− txt "::"
757620 breakpoint
758− inci $ located hsib_body p_hsType
759− ExprWithTySig NoExtField _ HsWC {hswc_body = XHsImplicitBndrs x} -> noExtCon x
760− ExprWithTySig NoExtField _ (XHsWildCardBndrs x) -> noExtCon x
761− ArithSeq NoExtField _ x ->
621+ inci $ do
622+ txt ":: "
623+ let HsWC {..} = affix
624+ HsIB {..} = hswc_body
625+ located hsib_body p_hsType
626+ ArithSeq NoExt _ x -> do
762627 case x of
763− From from -> brackets s $ do
628+ From from -> brackets . sitcc $ do
764629 located from p_hsExpr
765630 breakpoint
766631 txt ".."
767− FromThen from next -> brackets s $ do
768− sep commaDel (located' p_hsExpr) [from, next]
632+ FromThen from next -> brackets . sitcc $ do
633+ sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
769634 breakpoint
770635 txt ".."
771− FromTo from to -> brackets s $ do
636+ FromTo from to -> brackets . sitcc $ do
772637 located from p_hsExpr
773638 breakpoint
774− txt ".."
775− space
639+ txt ".. "
776640 located to p_hsExpr
777− FromThenTo from next to -> brackets s $ do
778− sep commaDel (located' p_hsExpr) [from, next]
641+ FromThenTo from next to -> brackets . sitcc $ do
642+ sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
779643 breakpoint
780− txt ".."
781− space
644+ txt ".. "
782645 located to p_hsExpr
783− HsSCC NoExtField _ name x -> do
646+ HsSCC NoExt _ name x -> do
784647 txt "{-# SCC "
785648 atom name
786649 txt " #-}"
787650 breakpoint
788651 located x p_hsExpr
789− HsCoreAnn NoExtField _ value x -> do
652+ HsCoreAnn NoExt _ value x -> do
790653 txt "{-# CORE "
791654 atom value
792655 txt " #-}"
793656 breakpoint
794657 located x p_hsExpr
795− HsBracket NoExtField x -> p_hsBracket x
658+ HsBracket NoExt x -> p_hsBracket x
796659 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
797660 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
798− HsSpliceE NoExtField splice -> p_hsSplice splice
799− HsProc NoExtField p e -> do
661+ HsSpliceE NoExt splice -> p_hsSplice splice
662+ HsProc NoExt p e -> do
800663 txt "proc"
801664 located p $ \x -> do
802665 breakpoint
@@ -805,159 +668,92 @@ p_hsExpr' s = \case
805668 txt "->"
806669 placeHanging (cmdTopPlacement (unLoc e)) $
807670 located e p_hsCmdTop
808− HsStatic _ e -> do
671+ HsStatic _ e -> do
809672 txt "static"
810673 breakpoint
811674 inci (located e p_hsExpr)
675+ HsArrApp NoExt body input arrType cond ->
676+ p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
677+ HsArrForm NoExt form mfixity cmds ->
678+ p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
812679 HsTick {} -> notImplemented "HsTick"
813680 HsBinTick {} -> notImplemented "HsBinTick"
814681 HsTickPragma {} -> notImplemented "HsTickPragma"
682+ EWildPat NoExt -> txt "_"
683+ EAsPat {} -> notImplemented "EAsPat"
684+ EViewPat {} -> notImplemented "EViewPat"
685+ ELazyPat {} -> notImplemented "ELazyPat"
815686 HsWrap {} -> notImplemented "HsWrap"
816− XExpr x -> noExtCon x
687+ XExpr {} -> notImplemented "XExpr"
817688
818689p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
819690p_patSynBind PSB {..} = do
820− let rhs = do
821− space
822− case psb_dir of
823− Unidirectional -> do
824− txt "<-"
825− breakpoint
826− located psb_def p_pat
827− ImplicitBidirectional -> do
828− equals
829− breakpoint
830− located psb_def p_pat
831− ExplicitBidirectional mgroup -> do
832− txt "<-"
833− breakpoint
834− located psb_def p_pat
835− newline
836− txt "where"
837− newline
838− inci (p_matchGroup (Function psb_id) mgroup)
839− txt "pattern"
840− case psb_args of
841− PrefixCon xs -> do
842− space
691+ txt "pattern "
692+ case psb_dir of
693+ Unidirectional -> do
843694 p_rdrName psb_id
844695 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
696+ p_patSynDetails psb_args
697+ txt " <-"
698+ breakpoint
699+ located psb_def p_pat
700+ ImplicitBidirectional -> do
851701 p_rdrName psb_id
852702 inci $ do
853− switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
854− unless (null xs) breakpoint
855− braces N $
856− sep commaDel (p_rdrName . recordPatSynPatVar) xs
857− rhs
858− InfixCon l r -> do
859− switchLayout [getLoc l, getLoc r] $ do
860− space
861− p_rdrName l
703+ p_patSynDetails psb_args
704+ txt " ="
862705 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)
706+ located psb_def p_pat
707+ ExplicitBidirectional mgroup -> do
708+ p_rdrName psb_id
709+ inci $ do
710+ p_patSynDetails psb_args
711+ txt " <-"
712+ breakpoint
713+ located psb_def p_pat
714+ newline
715+ line (txt "where")
716+ inci (p_matchGroup (Function psb_id) mgroup)
717+p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
718+
719+p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
720+p_patSynDetails = \case
721+ PrefixCon xs ->
722+ switchLayout (getLoc <$> xs) $ do
723+ unless (null xs) breakpoint
724+ sitcc (sep breakpoint p_rdrName xs)
725+ RecCon xs ->
726+ switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
727+ unless (null xs) breakpoint
728+ braces . sitcc $ sep (comma >> breakpoint) (p_rdrName . recordPatSynPatVar) xs
729+ InfixCon _ _ -> notImplemented "InfixCon"
934730
935731p_pat :: Pat GhcPs -> R ()
936732p_pat = \case
937− WildPat NoExtField -> txt "_"
938− VarPat NoExtField name -> p_rdrName name
939− LazyPat NoExtField pat -> do
733+ WildPat NoExt -> txt "_"
734+ VarPat NoExt name -> p_rdrName name
735+ LazyPat NoExt pat -> do
940736 txt "~"
941737 located pat p_pat
942− AsPat NoExtField name pat -> do
738+ AsPat NoExt name pat -> do
943739 p_rdrName name
944740 txt "@"
945741 located pat p_pat
946− ParPat NoExtField pat ->
947− located pat (parens S . p_pat)
948− BangPat NoExtField pat -> do
742+ ParPat NoExt pat ->
743+ located pat (parens . p_pat)
744+ BangPat NoExt pat -> do
949745 txt "!"
950746 located pat p_pat
951− ListPat NoExtField pats ->
952− brackets S $ sep commaDel (located' p_pat) pats
953− TuplePat NoExtField pats boxing -> do
954− let parens' =
747+ ListPat NoExt pats -> do
748+ brackets . sitcc $ sep (comma >> breakpoint) (located' p_pat) pats
749+ TuplePat NoExt pats boxing -> do
750+ let f =
955751 case boxing of
956− Boxed -> parens S
957− Unboxed -> parensHash S
958− parens' $ sep commaDel (sitcc . located' p_pat) pats
959− SumPat NoExtField pat tag arity ->
960− p_unboxedSum S tag arity (located pat p_pat)
752+ Boxed -> parens
753+ Unboxed -> parensHash
754+ f . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_pat) pats
755+ SumPat NoExt pat tag arity ->
756+ p_unboxedSum tag arity (located pat p_pat)
961757 ConPatIn pat details ->
962758 case details of
963759 PrefixCon xs -> sitcc $ do
@@ -971,115 +767,107 @@ p_pat = \case
971767 let f = \case
972768 Nothing -> txt ".."
973769 Just x -> located x p_pat_hsRecField
974− inci . braces N . sep commaDel f $
975− case dotdot of
976− Nothing -> Just <$> fields
977− Just (L _ n) -> (Just <$> take n fields) ++ [Nothing]
978− InfixCon l r -> do
979− switchLayout [getLoc l, getLoc r] $ do
980− located l p_pat
981− breakpoint
982− inci $ do
983− p_rdrName pat
984− space
985− located r p_pat
770+ inci . braces . sitcc . sep (comma >> breakpoint) f $ case dotdot of
771+ Nothing -> Just <$> fields
772+ Just n -> (Just <$> take n fields) ++ [Nothing]
773+ InfixCon x y -> do
774+ located x p_pat
775+ space
776+ p_rdrName pat
777+ breakpoint
778+ inci (located y p_pat)
986779 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
987− ViewPat NoExtField expr pat -> sitcc $ do
780+ ViewPat NoExt expr pat -> sitcc $ do
988781 located expr p_hsExpr
989− space
990− txt "->"
782+ txt " ->"
991783 breakpoint
992784 inci (located pat p_pat)
993− SplicePat NoExtField splice -> p_hsSplice splice
994− LitPat NoExtField p -> atom p
995− NPat NoExtField v _ _ -> located v (atom . ol_val)
996− NPlusKPat NoExtField n k _ _ _ -> sitcc $ do
785+ SplicePat NoExt splice -> p_hsSplice splice
786+ LitPat NoExt p -> atom p
787+ NPat NoExt v _ _ -> located v (atom . ol_val)
788+ NPlusKPat NoExt n k _ _ _ -> sitcc $ do
997789 p_rdrName n
998790 breakpoint
999791 inci $ do
1000− txt "+"
1001− space
792+ txt "+ "
1002793 located k (atom . ol_val)
1003− SigPat NoExtField pat hswc -> do
794+ SigPat hswc pat -> do
1004795 located pat p_pat
1005796 p_typeAscription hswc
1006797 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
1007− XPat x -> noExtCon x
798+ XPat NoExt -> notImplemented "XPat"
1008799
1009800p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1010801p_pat_hsRecField HsRecField {..} = do
1011802 located hsRecFieldLbl $ \x ->
1012803 p_rdrName (rdrNameFieldOcc x)
1013804 unless hsRecPun $ do
1014− space
1015− equals
805+ txt " ="
1016806 breakpoint
1017807 inci (located hsRecFieldArg p_pat)
1018808
1019−p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
1020−p_unboxedSum s tag arity m = do
809+p_unboxedSum :: ConTag -> Arity -> R () -> R ()
810+p_unboxedSum tag arity m = do
1021811 let before = tag - 1
1022812 after = arity - before - 1
1023813 args = replicate before Nothing <> [Just m] <> replicate after Nothing
1024− f x =
814+ f (x,i) = do
815+ let isFirst = i == 0
816+ isLast = i == arity - 1
1025817 case x :: Maybe (R ()) of
1026818 Nothing ->
1027− space
819+ unless (isFirst || isLast) space
1028820 Just m' -> do
1029− space
821+ unless isFirst space
1030822 m'
1031− space
1032− parensHash s $ sep (txt "|") f args
823+ unless isLast space
824+ parensHash $ sep (txt "|") f (zip args [0..])
1033825
1034826p_hsSplice :: HsSplice GhcPs -> R ()
1035827p_hsSplice = \case
1036− HsTypedSplice NoExtField deco _ expr -> p_hsSpliceTH True expr deco
1037− HsUntypedSplice NoExtField deco _ expr -> p_hsSpliceTH False expr deco
1038− HsQuasiQuote NoExtField _ quoterName srcSpan str -> do
828+ HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
829+ HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
830+ HsQuasiQuote NoExt _ quoterName srcSpan str -> do
1039831 txt "["
1040832 p_rdrName (L srcSpan quoterName)
1041833 txt "|"
1042− -- QuasiQuoters often rely on precise custom strings. We cannot do any
1043− -- formatting here without potentially breaking someone's code.
834+ -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
835+ -- any formatting here without potentially breaking someone's code.
1044836 atom str
1045837 txt "|]"
1046838 HsSpliced {} -> notImplemented "HsSpliced"
1047− HsSplicedT {} -> notImplemented "HsSplicedT"
1048− XSplice x -> noExtCon x
839+ XSplice {} -> notImplemented "XSplice"
1049840
1050−p_hsSpliceTH ::
1051− -- | Typed splice?
1052− Bool ->
1053− -- | Splice expression
1054− LHsExpr GhcPs ->
1055− -- | Splice decoration
1056− SpliceDecoration ->
1057− R ()
841+p_hsSpliceTH
842+ :: Bool -- ^ Typed splice?
843+ -> LHsExpr GhcPs -- ^ Splice expression
844+ -> SpliceDecoration -- ^ Splice decoration
845+ -> R ()
1058846p_hsSpliceTH isTyped expr = \case
1059847 HasParens -> do
1060848 txt decoSymbol
1061− parens N (located expr (sitcc . p_hsExpr))
849+ parens (located expr (sitcc . p_hsExpr))
1062850 HasDollar -> do
1063851 txt decoSymbol
1064852 located expr (sitcc . p_hsExpr)
1065− NoParens ->
853+ NoParens -> do
1066854 located expr (sitcc . p_hsExpr)
1067855 where
1068856 decoSymbol = if isTyped then "$$" else "$"
1069857
1070858p_hsBracket :: HsBracket GhcPs -> R ()
1071859p_hsBracket = \case
1072− ExpBr NoExtField expr -> do
860+ ExpBr NoExt expr -> do
1073861 anns <- getEnclosingAnns
1074862 let name = case anns of
1075− AnnOpenEQ : _ -> ""
863+ AnnOpenEQ:_ -> ""
1076864 _ -> "e"
1077865 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
866+ PatBr NoExt pat -> quote "p" (located pat p_pat)
867+ DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
868+ DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
869+ TypBr NoExt ty -> quote "t" (located ty p_hsType)
870+ VarBr NoExt isSingleQuote name -> do
1083871 txt (bool "''" "'" isSingleQuote)
1084872 -- HACK As you can see we use 'noLoc' here to be able to pass name into
1085873 -- 'p_rdrName' since the latter expects a "located" thing. The problem
@@ -1087,20 +875,19 @@ p_hsBracket = \case
1087875 -- turn makes it impossible to detect if there are parentheses around
1088876 -- it, etc. So we have to add parentheses manually assuming they are
1089877 -- 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
878+ let isOperator = all
879+ (\i -> isPunctuation i || isSymbol i)
880+ (showOutputable (rdrNameOcc name))
881+ && not (doesNotNeedExtraParens name)
882+ wrapper = if isOperator then parens else id
1096883 wrapper $ p_rdrName (noLoc name)
1097− TExpBr NoExtField expr -> do
884+ TExpBr NoExt expr -> do
1098885 txt "[||"
1099886 breakpoint'
1100887 located expr p_hsExpr
1101888 breakpoint'
1102889 txt "||]"
1103− XBracket x -> noExtCon x
890+ XBracket {} -> notImplemented "XBracket"
1104891 where
1105892 quote :: Text -> R () -> R ()
1106893 quote name body = do
@@ -1113,65 +900,12 @@ p_hsBracket = \case
1113900 breakpoint'
1114901 txt "|]"
1115902
1116−-- Print the source text of a string literal while indenting
1117−-- gaps correctly.
1118−
1119−p_stringLit :: String -> R ()
1120−p_stringLit src =
1121− let s = splitGaps src
1122− singleLine =
1123− txt $ Text.pack (mconcat s)
1124− multiLine =
1125− sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126− in vlayout singleLine multiLine
1127− where
1128− -- Split a string on gaps (backslash delimited whitespaces)
1129− --
1130− -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131− splitGaps :: String -> [String]
1132− splitGaps "" = []
1133− splitGaps s =
1134− let -- A backslash and a whitespace starts a "gap"
1135− p (Just '\\', _, _) = True
1136− p (_, '\\', Just c) | ghcSpace c = False
1137− p _ = True
1138− in case span p (zipPrevNext s) of
1139− (l, r) ->
1140− let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141− r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142− in map orig l : splitGaps r'
1143− -- GHC's definition of whitespaces in strings
1144− -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145− ghcSpace :: Char -> Bool
1146− ghcSpace c = c <= '\x7f' && is_space c
1147− -- Add backslashes to the inner side of the strings
1148− --
1149− -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150− backslashes :: [String] -> [String]
1151− backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152− backslashes xs = xs
1153− -- Attaches previous and next items to each list element
1154− zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1155− zipPrevNext xs =
1156− let z =
1157− zip
1158− (zip (Nothing : map Just xs) xs)
1159− (map Just (tail xs) ++ repeat Nothing)
1160− in map (\((p, x), n) -> (p, x, n)) z
1161− orig (_, x, _) = x
1162−
1163903----------------------------------------------------------------------------
1164904-- Helpers
1165905
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−
1173906-- | Append each element in both lists with semigroups. If one list is shorter
1174907-- than the other, return the rest of the longer list unchanged.
908+
1175909liftAppend :: Semigroup a => [a] -> [a] -> [a]
1176910liftAppend [] [] = []
1177911liftAppend [] (y : ys) = y : ys
@@ -1179,15 +913,16 @@ liftAppend (x : xs) [] = x : xs
1179913liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
1180914
1181915getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1182−getGRHSSpan (GRHS NoExtField guards body) =
916+getGRHSSpan (GRHS NoExt guards body) =
1183917 combineSrcSpans' $ getLoc body :| map getLoc guards
1184−getGRHSSpan (XGRHS x) = noExtCon x
918+getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1185919
1186920-- | Place a thing that may have a hanging form. This function handles how
1187921-- to separate it from preceding expressions and whether to bump indentation
1188922-- depending on what sort of expression we have.
923+
1189924placeHanging :: Placement -> R () -> R ()
1190−placeHanging placement m =
925+placeHanging placement m = do
1191926 case placement of
1192927 Hanging -> do
1193928 space
@@ -1198,165 +933,67 @@ placeHanging placement m =
1198933
1199934-- | Check if given block contains single expression which has a hanging
1200935-- form.
1201−blockPlacement ::
1202− (body -> Placement) ->
1203− [LGRHS GhcPs (Located body)] ->
1204− Placement
1205−blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
936+
937+blockPlacement
938+ :: (body -> Placement)
939+ -> [LGRHS GhcPs (Located body)]
940+ -> Placement
941+blockPlacement placer [(L _ (GRHS NoExt _ (L _ x)))] = placer x
1206942blockPlacement _ _ = Normal
1207943
1208944-- | Check if given command has a hanging form.
945+
1209946cmdPlacement :: HsCmd GhcPs -> Placement
1210947cmdPlacement = \case
1211− HsCmdLam NoExtField _ -> Hanging
1212− HsCmdCase NoExtField _ _ -> Hanging
1213− HsCmdDo NoExtField _ -> Hanging
948+ HsCmdLam NoExt _ -> Hanging
949+ HsCmdCase NoExt _ _ -> Hanging
950+ HsCmdDo NoExt _ -> Hanging
1214951 _ -> Normal
1215952
1216953cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1217954cmdTopPlacement = \case
1218− HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219− XCmdTop x -> noExtCon x
955+ HsCmdTop NoExt (L _ x) -> cmdPlacement x
956+ XCmdTop {} -> notImplemented "XCmdTop"
1220957
1221958-- | Check if given expression has a hanging form.
959+
1222960exprPlacement :: HsExpr GhcPs -> Placement
1223961exprPlacement = \case
1224962 -- 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
963+ HsLam NoExt mg -> case mg of
964+ MG _ (L _ [L _ (Match NoExt _ (x:xs) _)]) _
965+ | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs))
966+ -> Hanging
1229967 _ -> 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 _ ->
968+ HsLamCase NoExt _ -> Hanging
969+ HsCase NoExt _ _ -> Hanging
970+ HsDo NoExt DoExpr _ -> Hanging
971+ HsDo NoExt MDoExpr _ -> Hanging
972+ RecordCon NoExt _ _ -> Hanging
973+ -- If the rightmost expression in an operator chain is hanging, make the
974+ -- whole block hanging; so that we can use the common @f = foo $ do@
975+ -- style.
976+ OpApp NoExt _ _ y -> exprPlacement (unLoc y)
977+ HsProc NoExt (L s _) _ ->
1240978 -- Indentation breaks if pattern is longer than one line and left
1241979 -- hanging. Consequently, only apply hanging when it is safe.
1242− if isOneLineSpan (getLoc p)
1243− then Hanging
1244− else Normal
980+ if isOneLineSpan s
981+ then Hanging
982+ else Normal
1245983 _ -> Normal
1246984
1247985withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1248986withGuards = any (checkOne . unLoc)
1249987 where
1250988 checkOne :: GRHS GhcPs (Located body) -> Bool
1251− checkOne (GRHS NoExtField [] _) = False
989+ checkOne (GRHS NoExt [] _) = False
1252990 checkOne _ = True
1253991
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−
1356992-- | Get annotations for the enclosing element.
993+
1357994getEnclosingAnns :: R [AnnKeywordId]
1358995getEnclosingAnns = do
1359996 e <- getEnclosingSpan (const True)
1360997 case e of
1361998 Nothing -> return []
1362− Just e' -> getAnns (RealSrcSpan e')
999+ Just e' -> getAnns (RealSrcSpan e')