@@ -1,43 +1,34 @@
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)
21−import Data.Char (isPunctuation, isSymbol)
17+import Data.Char (isPunctuation)
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
2720import Data.Text (Text)
28−import qualified Data.Text as Text
2921import GHC
30−import OccName (occNameString)
3122import Ormolu.Printer.Combinators
32−import Ormolu.Printer.Internal
3323import Ormolu.Printer.Meat.Common
34−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
3524import Ormolu.Printer.Meat.Declaration.Signature
3625import Ormolu.Printer.Meat.Type
37−import Ormolu.Printer.Operators
3826import Ormolu.Utils
27+import Outputable (Outputable (..))
28+import SrcLoc (combineSrcSpans, isOneLineSpan)
29+import qualified Data.List.NonEmpty as NE
30+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
3931
40−-- | Style of a group of equations.
4132data MatchGroupStyle
4233 = Function (Located RdrName)
4334 | PatternBind
@@ -45,132 +36,87 @@ data MatchGroupStyle
4536 | Lambda
4637 | LambdaCase
4738
48−-- | Style of equations in a group.
4939data GroupStyle
5040 = EqualSign
5141 | RightArrow
5242
5343-- | Expression placement. This marks the places where expressions that
5444-- implement handing forms may use them.
45+
5546data 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)
47+ = Normal -- ^ Multi-line layout should cause
48+ -- insertion of a newline and indentation
49+ -- bump
50+ | Hanging -- ^ Expressions that have hanging form
51+ -- should use it and avoid bumping one level
52+ -- of indentation
6553
6654p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
67−p_valDecl = \case
68− FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
69− PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
55+p_valDecl = line . p_valDecl'
56+
57+p_valDecl' :: HsBindLR GhcPs GhcPs -> R ()
58+p_valDecl' = \case
59+ FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
60+ PatBind NoExt pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
7061 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
7162 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
72− PatSynBind NoExtField psb -> p_patSynBind psb
73− XHsBindsLR x -> noExtCon x
74−
75−p_funBind ::
76− Located RdrName ->
77− MatchGroup GhcPs (LHsExpr GhcPs) ->
78− R ()
79−p_funBind name = p_matchGroup (Function name)
80−
81−p_matchGroup ::
82− MatchGroupStyle ->
83− MatchGroup GhcPs (LHsExpr GhcPs) ->
84− R ()
63+ PatSynBind NoExt psb -> p_patSynBind psb
64+ XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
65+
66+p_funBind
67+ :: Located RdrName
68+ -> MatchGroup GhcPs (LHsExpr GhcPs)
69+ -> R ()
70+p_funBind name mgroup =
71+ p_matchGroup (Function name) mgroup
72+
73+p_matchGroup
74+ :: MatchGroupStyle
75+ -> MatchGroup GhcPs (LHsExpr GhcPs)
76+ -> R ()
8577p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
8678
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
79+p_matchGroup'
80+ :: Data body
81+ => (body -> Placement)
82+ -> (body -> R ())
83+ -> MatchGroupStyle
84+ -> MatchGroup GhcPs (Located body)
85+ -> R ()
86+p_matchGroup' placer pretty style MG {..} =
87+ locatedVia Nothing mg_alts $
88+ newlineSep (located' (\m@Match {..} ->
89+ p_match' placer pretty style (isInfixMatch m) (matchStrictness m) m_pats m_grhss))
90+p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
13391
13492matchStrictness :: Match id body -> SrcStrictness
13593matchStrictness match =
13694 case m_ctxt match of
137− FunRhs {mc_strictness = s} -> s
95+ FunRhs{mc_strictness=s} -> s
13896 _ -> NoSrcStrict
13997
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 ()
98+p_match
99+ :: MatchGroupStyle
100+ -> Bool -- ^ Is this an infix match?
101+ -> SrcStrictness -- ^ Strictness prefix (FunBind)
102+ -> [LPat GhcPs]
103+ -> GRHSs GhcPs (LHsExpr GhcPs)
104+ -> R ()
152105p_match = p_match' exprPlacement p_hsExpr
153106
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
107+p_match'
108+ :: Data body
109+ => (body -> Placement)
110+ -> (body -> R ())
111+ -> MatchGroupStyle
112+ -> Bool -- ^ Is this an infix match?
113+ -> SrcStrictness -- ^ Strictness prefix (FunBind)
114+ -> [LPat GhcPs]
115+ -> GRHSs GhcPs (Located body)
116+ -> R ()
117+p_match' placer pretty style isInfix strictness m_pats m_grhss = do
118+ -- NOTE Normally, since patterns may be placed in a multi-line layout, it
119+ -- is necessary to bump indentation for the pattern group so it's more
174120 -- indented than function name. This in turn means that indentation for
175121 -- the body should also be bumped. Normally this would mean that bodies
176122 -- would start with two indentation steps applied, which is ugly, so we
@@ -180,24 +126,23 @@ p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
180126 NoSrcStrict -> return ()
181127 SrcStrict -> txt "!"
182128 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 ()
129+ inci' <- case NE.nonEmpty m_pats of
130+ Nothing -> id <$ case style of
131+ Function name -> p_rdrName name
132+ _ -> return ()
188133 Just ne_pats -> do
189− let combinedSpans = case style of
190− Function name -> combineSrcSpans (getLoc name) patSpans
191− _ -> patSpans
192− patSpans = combineSrcSpans' (getLoc <$> ne_pats)
193− indentBody = not (isOneLineSpan combinedSpans)
194− switchLayout [combinedSpans] $ do
195− let stdCase = sep breakpoint (located' p_pat) m_pats
134+ let combinedSpans = combineSrcSpans' $
135+ getLoc <$> ne_pats
136+ inci' = if isOneLineSpan combinedSpans
137+ then id
138+ else inci
139+ switchLayout combinedSpans $ do
140+ let stdCase = velt' (located' p_pat <$> m_pats)
196141 case style of
197142 Function name ->
198143 p_infixDefHelper
199144 isInfix
200− indentBody
145+ inci'
201146 (p_rdrName name)
202147 (located' p_pat <$> m_pats)
203148 PatternBind -> stdCase
@@ -208,256 +153,225 @@ p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
208153 BangPat _ _ -> True
209154 SplicePat _ _ -> True
210155 _ -> False
211− txt "\\"
212− when needsSpace space
213− sitcc stdCase
156+ txt (if needsSpace then "\\ " else "\\")
157+ stdCase
214158 LambdaCase -> stdCase
215− return indentBody
216− let -- Calculate position of end of patterns. This is useful when we decide
217− -- about putting certain constructions in hanging positions.
218− endOfPats = case NE.nonEmpty m_pats of
219− Nothing -> case style of
220− Function name -> Just (getLoc name)
221− _ -> Nothing
222− Just pats -> (Just . getLoc . NE.last) pats
223− isCase = \case
224− Case -> True
225− LambdaCase -> True
226− _ -> False
227− hasGuards = withGuards grhssGRHSs
228− grhssSpan =
229− combineSrcSpans' $
230− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
231− patGrhssSpan =
232− maybe
233− grhssSpan
234− (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
235− endOfPats
236− placement =
237− case endOfPats of
238− Nothing -> blockPlacement placer grhssGRHSs
239− Just spn ->
240− if onTheSameLine spn grhssSpan
241− then blockPlacement placer grhssGRHSs
242− else Normal
243− p_body = do
244− let groupStyle =
245− if isCase style && hasGuards
246− then RightArrow
247− else EqualSign
248− sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
249− p_where = do
250− let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
251− unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
252− breakpoint
253− txt "where"
254− unless whereIsEmpty breakpoint
255− inci $ located grhssLocalBinds p_hsLocalBinds
256− inciIf indentBody $ do
257− unless (length grhssGRHSs > 1) $
159+ return inci'
160+
161+ let
162+ -- Calculate position of end of patterns. This is useful when we decide
163+ -- about putting certain constructions in hanging positions.
164+ endOfPats = case NE.nonEmpty m_pats of
165+ Nothing -> case style of
166+ Function name -> (Just . srcSpanEnd . getLoc) name
167+ _ -> Nothing
168+ Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
169+ isCase = \case
170+ Case -> True
171+ LambdaCase -> True
172+ _ -> False
173+ inci' $ do
174+ let GRHSs {..} = m_grhss
175+ hasGuards = withGuards grhssGRHSs
176+ unless (length grhssGRHSs > 1) $ do
258177 case style of
259178 Function _ | hasGuards -> return ()
260− Function _ -> space >> inci equals
261− PatternBind -> space >> inci equals
179+ Function _ -> txt " ="
180+ PatternBind -> txt " ="
262181 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
182+ _ -> txt " ->"
183+ let grhssSpan = combineSrcSpans' $
184+ getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
185+ patGrhssSpan = maybe grhssSpan
186+ (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
187+ placement =
188+ case endOfPats of
189+ Nothing -> blockPlacement placer grhssGRHSs
190+ Just spn ->
191+ if isOneLineSpan
192+ (mkSrcSpan spn (srcSpanStart grhssSpan))
193+ then blockPlacement placer grhssGRHSs
194+ else Normal
195+ inciLocalBinds = case placement of
196+ Normal -> id
197+ Hanging -> inci
198+ p_body = do
199+ let groupStyle =
200+ if isCase style && hasGuards
201+ then RightArrow
202+ else EqualSign
203+ newlineSep (located' (p_grhs' pretty groupStyle)) grhssGRHSs
204+ let whereLocation = combineSrcSpans patGrhssSpan $ getLoc grhssLocalBinds
205+ whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
206+ unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds))
207+ . inciLocalBinds
208+ . switchLayout whereLocation $ do
209+ if whereIsEmpty then newline else breakpoint
210+ txt "where"
211+ unless whereIsEmpty $ do
212+ breakpoint
213+ inci (located grhssLocalBinds p_hsLocalBinds)
214+ case style of
215+ Lambda -> placeHanging placement $
216+ switchLayout patGrhssSpan p_body
217+ _ -> switchLayout patGrhssSpan $
218+ placeHanging placement p_body
268219
269220p_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) =
221+p_grhs = p_grhs' p_hsExpr
222+
223+p_grhs'
224+ :: Data body
225+ => (body -> R ())
226+ -> GroupStyle
227+ -> GRHS GhcPs (Located body)
228+ -> R ()
229+p_grhs' pretty style (GRHS NoExt guards body) =
282230 case guards of
283231 [] -> p_body
284232 xs -> do
285− txt "|"
233+ txt "| "
234+ velt $ withSep comma (located' p_stmt) xs
286235 space
287− sitcc (sep commaDel (sitcc . located' p_stmt) xs)
288− space
289− inci $ case style of
290− EqualSign -> equals
291− RightArrow -> txt "->"
292− placeHanging placement p_body
236+ txt $ case style of
237+ EqualSign -> "="
238+ RightArrow -> "->"
239+ breakpoint
240+ inci p_body
293241 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
242+ p_body = located body pretty
243+p_grhs' _ _ (XGRHS NoExt) = notImplemented "XGRHS"
307244
308245p_hsCmd :: HsCmd GhcPs -> R ()
309246p_hsCmd = \case
310− HsCmdArrApp NoExtField body input arrType _ -> do
247+ HsCmdArrApp NoExt body input arrType _ -> do
311248 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
249+ txt $ case arrType of
250+ HsFirstOrderApp -> " -<"
251+ HsHigherOrderApp -> " -<<"
252+ placeHanging (exprPlacement (unLoc input)) $
253+ located input p_hsExpr
254+ HsCmdArrForm NoExt form Prefix _ cmds -> banana $ sitcc $ do
320255 located form p_hsExpr
321− unless (null cmds) $ do
256+ unless (null cmds) $ do
322257 breakpoint
323258 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
324− HsCmdArrForm NoExtField form Infix _ [left, right] -> do
259+ HsCmdArrForm NoExt form Infix _ [left, right] -> do
325260 located left p_hsCmdTop
326261 space
327262 located form p_hsExpr
328263 placeHanging (cmdTopPlacement (unLoc right)) $
329264 located right p_hsCmdTop
330− HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
265+ HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
331266 HsCmdApp {} ->
332267 -- XXX Does this ever occur in the syntax tree? It does not seem like it
333268 -- does. Open an issue and ping @yumiova if this ever occurs in output.
334269 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
270+ HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
271+ HsCmdPar NoExt c -> parens (located c p_hsCmd)
272+ HsCmdCase NoExt e mgroup -> do
273+ txt "case "
274+ located e p_hsExpr
275+ txt " of"
276+ breakpoint
277+ inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
278+ HsCmdIf NoExt _ if' then' else' -> do
279+ txt "if "
280+ located if' p_hsExpr
281+ breakpoint
282+ txt "then"
283+ located then' $ \x -> do
284+ breakpoint
285+ inci (p_hsCmd x)
286+ breakpoint
287+ txt "else"
288+ located else' $ \x -> do
289+ breakpoint
290+ inci (p_hsCmd x)
291+ HsCmdLet NoExt localBinds c -> do
292+ txt "let "
293+ sitcc (located localBinds p_hsLocalBinds)
294+ breakpoint
295+ txt "in "
296+ sitcc (located c p_hsCmd)
297+ HsCmdDo NoExt es -> do
344298 txt "do"
345299 newline
346− inci . located es $
347− sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
300+ inci (located es (newlineSep (located' (sitcc . p_stmt' p_hsCmd))))
348301 HsCmdWrap {} -> notImplemented "HsCmdWrap"
349− XCmd x -> noExtCon x
302+ XCmd {} -> notImplemented "XCmd"
350303
351304p_hsCmdTop :: HsCmdTop GhcPs -> R ()
352305p_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)
306+ HsCmdTop NoExt cmd -> located cmd p_hsCmd
307+ XCmdTop {} -> notImplemented "XHsCmdTop"
384308
385309p_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
310+p_stmt = p_stmt' p_hsExpr
311+
312+p_stmt'
313+ :: Data body
314+ => (body -> R ())
315+ -> Stmt GhcPs (Located body)
316+ -> R ()
317+p_stmt' pretty = \case
318+ LastStmt NoExt body _ _ -> located body pretty
319+ BindStmt NoExt l f _ _ -> do
320+ located l p_pat
401321 space
402322 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)
323+ breakpoint
324+ inci (located f pretty)
413325 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
414− BodyStmt NoExtField body _ _ -> located body render
415− LetStmt NoExtField binds -> do
416− txt "let"
417− space
326+ BodyStmt NoExt body _ _ -> located body pretty
327+ LetStmt NoExt binds -> do
328+ txt "let "
418329 sitcc $ located binds p_hsLocalBinds
419330 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.
331+ -- NOTE 'ParStmt' should always be eliminated in 'gatherStmt' already,
332+ -- such that it never occurs in 'p_stmt''. Consequently, handling it
333+ -- here would be redundant.
423334 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'.
335+ TransStmt {..} -> do
336+ -- NOTE 'TransStmt' only needs to account for pretty printing itself,
337+ -- since pretty printing of relevant statements (e.g., in 'trS_stmts')
338+ -- is handled through 'gatherStmt'.
428339 case (trS_form, trS_by) of
429− (ThenForm, Nothing) -> do
340+ (ThenForm, Nothing) -> located trS_using $ \x -> do
430341 txt "then"
431342 breakpoint
432− inci $ located trS_using p_hsExpr
343+ inci (p_hsExpr x)
433344 (ThenForm, Just e) -> do
434− txt "then"
435− breakpoint
436− inci $ located trS_using p_hsExpr
437− breakpoint
438− txt "by"
345+ located trS_using $ \x -> do
346+ txt "then"
347+ breakpoint
348+ inci (p_hsExpr x)
439349 breakpoint
440− inci $ located e p_hsExpr
441− (GroupForm, Nothing) -> do
350+ located e $ \x -> do
351+ txt "by"
352+ breakpoint
353+ inci (p_hsExpr x)
354+ (GroupForm, Nothing) -> located trS_using $ \x -> do
442355 txt "then group using"
443356 breakpoint
444− inci $ located trS_using p_hsExpr
357+ inci (p_hsExpr x)
445358 (GroupForm, Just e) -> do
446− txt "then group by"
447− breakpoint
448− inci $ located e p_hsExpr
449− breakpoint
450− txt "using"
359+ located e $ \x -> do
360+ txt "then group by"
361+ breakpoint
362+ inci (p_hsExpr x)
451363 breakpoint
452− inci $ located trS_using p_hsExpr
364+ located trS_using $ \x -> do
365+ txt "using"
366+ breakpoint
367+ inci (p_hsExpr x)
453368 RecStmt {..} -> do
454− txt "rec"
455− space
456− sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457− XStmtLR c -> noExtCon c
369+ txt "rec "
370+ sitcc $ newlineSep (located' (p_stmt' pretty)) recS_stmts
371+ XStmtLR {} -> notImplemented "XStmtLR"
458372
459373gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
460−gatherStmt (L _ (ParStmt NoExtField block _ _)) =
374+gatherStmt (L _ (ParStmt NoExt block _ _)) =
461375 foldr ((<>) . gatherStmtBlock) [] block
462376gatherStmt (L s stmt@TransStmt {..}) =
463377 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
@@ -466,620 +380,429 @@ gatherStmt stmt = [[stmt]]
466380gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
467381gatherStmtBlock (ParStmtBlock _ stmts _ _) =
468382 foldr (liftAppend . gatherStmt) [] stmts
469−gatherStmtBlock (XParStmtBlock x) = noExtCon x
383+gatherStmtBlock XParStmtBlock {} = notImplemented "XParStmtBlock"
470384
471385p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
472386p_hsLocalBinds = \case
473− HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
474− -- When in a single-line layout, there is a chance that the inner
475− -- elements will also contain semicolons and they will confuse the
476− -- parser. so we request braces around every element except the last.
477− br <- layoutToBraces <$> getLayout
478− let items =
479− let injectLeft (L l x) = L l (Left x)
480− injectRight (L l x) = L l (Right x)
481− in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
482− positionToBracing = \case
483− SinglePos -> id
484− FirstPos -> br
485− MiddlePos -> br
486− LastPos -> id
487− p_item' (p, item) =
488− positionToBracing p $
489− withSpacing (either p_valDecl p_sigDecl) item
490− binds = sortOn (srcSpanStart . getLoc) items
491− sitcc $ sepSemi p_item' (attachRelativePos binds)
492− HsValBinds NoExtField _ -> notImplemented "HsValBinds"
493− HsIPBinds NoExtField (IPBinds NoExtField xs) ->
494− -- Second argument of IPBind is always Left before type-checking.
495− let p_ipBind (IPBind NoExtField (Left name) expr) = do
496− atom name
497− space
498− equals
499− breakpoint
500− useBraces $ inci $ located expr p_hsExpr
501− p_ipBind (IPBind NoExtField (Right _) _) =
502− -- Should only occur after the type checker
503− notImplemented "IPBind _ (Right _) _"
504− p_ipBind (XIPBind x) = noExtCon x
505− in sepSemi (located' p_ipBind) xs
506− HsIPBinds NoExtField _ -> notImplemented "HsIpBinds"
507− EmptyLocalBinds NoExtField -> return ()
508− XHsLocalBindsLR x -> noExtCon x
509−
510−p_hsRecField ::
511− HsRecField' RdrName (LHsExpr GhcPs) ->
512− R ()
513−p_hsRecField HsRecField {..} = do
514− p_rdrName hsRecFieldLbl
515− unless hsRecPun $ do
516− space
517− equals
518− let placement =
519− if onTheSameLine (getLoc hsRecFieldLbl) (getLoc hsRecFieldArg)
520− then exprPlacement (unLoc hsRecFieldArg)
521− else Normal
522− placeHanging placement (located hsRecFieldArg p_hsExpr)
387+ HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
388+ let ssStart = either
389+ (srcSpanStart . getLoc)
390+ (srcSpanStart . getLoc)
391+ items =
392+ (Left <$> bagToList bag) ++ (Right <$> lsigs)
393+ p_item (Left x) = located x p_valDecl'
394+ p_item (Right x) = located x p_sigDecl'
395+ newlineSep (sitcc . p_item) (sortOn ssStart items)
396+ HsValBinds NoExt _ -> notImplemented "HsValBinds"
397+ HsIPBinds NoExt _ -> notImplemented "HsIPBinds"
398+ EmptyLocalBinds NoExt -> return ()
399+ XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
400+
401+p_hsRecField
402+ :: (Data id, Outputable id)
403+ => HsRecField' id (LHsExpr GhcPs)
404+ -> R ()
405+p_hsRecField = \HsRecField {..} -> do
406+ located hsRecFieldLbl atom
407+ unless hsRecPun $ do
408+ txt " = "
409+ located hsRecFieldArg p_hsExpr
410+
411+p_hsTupArg :: HsTupArg GhcPs -> R ()
412+p_hsTupArg = \case
413+ Present NoExt x -> located x p_hsExpr
414+ Missing NoExt -> pure ()
415+ XTupArg {} -> notImplemented "XTupArg"
523416
524417p_hsExpr :: HsExpr GhcPs -> R ()
525−p_hsExpr = p_hsExpr' N
526−
527−p_hsExpr' :: BracketStyle -> HsExpr GhcPs -> R ()
528−p_hsExpr' s = \case
529− HsVar NoExtField name -> p_rdrName name
530− HsUnboundVar NoExtField v -> atom (unboundVarOcc v)
531− HsConLikeOut NoExtField _ -> notImplemented "HsConLikeOut"
532− HsRecFld NoExtField x ->
418+p_hsExpr = \case
419+ HsVar NoExt name -> p_rdrName name
420+ HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
421+ HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
422+ HsRecFld NoExt x ->
533423 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
424+ Unambiguous NoExt name -> p_rdrName name
425+ Ambiguous NoExt name -> p_rdrName name
426+ XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
427+ HsOverLabel NoExt _ v -> do
538428 txt "#"
539429 atom v
540− HsIPVar NoExtField (HsIPName name) -> do
430+ HsIPVar NoExt (HsIPName name) -> do
541431 txt "?"
542432 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 ->
433+ HsOverLit NoExt v -> atom (ol_val v)
434+ HsLit NoExt lit -> atom lit
435+ HsLam NoExt mgroup ->
550436 p_matchGroup Lambda mgroup
551− HsLamCase NoExtField mgroup -> do
437+ HsLamCase NoExt mgroup -> do
552438 txt "\\case"
553− breakpoint
439+ newline
554440 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
441+ HsApp NoExt f x -> do
442+ located f p_hsExpr
443+ breakpoint
444+ inci (located x p_hsExpr)
445+ HsAppType a e -> do
612446 located e p_hsExpr
613447 breakpoint
614448 inci $ do
615449 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 ()
621450 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 "-"
451+ OpApp NoExt x op y -> do
452+ located x p_hsExpr
627453 space
454+ let opWrapper = case unLoc op of
455+ EWildPat NoExt -> backticks
456+ _ -> id
457+ located op (opWrapper . p_hsExpr)
458+ placeHanging (exprPlacement (unLoc y)) $
459+ located y p_hsExpr
460+ NegApp NoExt e _ -> do
461+ txt "- "
628462 located e p_hsExpr
629− HsPar NoExtField e ->
630− parens s (located e (dontUseBraces . p_hsExpr))
631− SectionL NoExtField x op -> do
463+ HsPar NoExt e -> parens (located e p_hsExpr)
464+ SectionL NoExt x op -> do
632465 located x p_hsExpr
633466 breakpoint
634467 inci (located op p_hsExpr)
635− SectionR NoExtField op x -> do
468+ SectionR NoExt op x -> do
636469 located op p_hsExpr
637− useRecordDot' <- useRecordDot
638− let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639− unless (useRecordDot' && isRecordDot') breakpoint
470+ breakpoint
640471 inci (located x p_hsExpr)
641− ExplicitTuple NoExtField args boxity ->
472+ ExplicitTuple NoExt args boxity -> do
642473 let isSection = any (isMissing . unLoc) args
643474 isMissing = \case
644− Missing NoExtField -> True
475+ Missing NoExt -> True
645476 _ -> 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' =
477+ let parens' =
652478 case boxity of
653479 Boxed -> parens
654480 Unboxed -> parensHash
655− in if isSection
656− then
657− switchLayout [] . parens' s $
658− sep comma p_larg args
659− else
660− switchLayout (getLoc <$> args) . parens' s $
661− sep commaDel p_larg args
662− ExplicitSum NoExtField tag arity e ->
663− p_unboxedSum N tag arity (located e p_hsExpr)
664− HsCase NoExtField e mgroup ->
665− p_case exprPlacement p_hsExpr e mgroup
666− HsIf NoExtField _ if' then' else' ->
667− p_if exprPlacement p_hsExpr if' then' else'
668− HsMultiIf NoExtField guards -> do
669− txt "if"
481+ parens' $ if isSection
482+ then sequence_ (withSep (txt ",") (located' p_hsTupArg) args)
483+ else velt (withSep comma (located' p_hsTupArg) args)
484+ ExplicitSum NoExt tag arity e -> do
485+ let before = tag - 1
486+ after = arity - before - 1
487+ args = replicate before Nothing <> [Just e] <> replicate after Nothing
488+ f (x,i) = do
489+ let isFirst = i == 0
490+ isLast = i == arity - 1
491+ case x of
492+ Nothing ->
493+ unless (isFirst || isLast) space
494+ Just l -> do
495+ unless isFirst space
496+ located l p_hsExpr
497+ unless isLast space
498+ parensHash $ sequence_ (withSep (txt "|") f (zip args [0..]))
499+ HsCase NoExt e mgroup -> do
500+ txt "case "
501+ located e p_hsExpr
502+ txt " of"
670503 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
504+ inci (p_matchGroup Case mgroup)
505+ HsIf NoExt _ if' then' else' -> do
506+ txt "if "
507+ located if' p_hsExpr
508+ breakpoint
509+ txt "then"
510+ located then' $ \x -> do
511+ breakpoint
512+ inci (p_hsExpr x)
513+ breakpoint
514+ txt "else"
515+ located else' $ \x -> do
516+ breakpoint
517+ inci (p_hsExpr x)
518+ HsMultiIf NoExt guards -> do
519+ txt "if "
520+ sitcc $ newlineSep (located' (p_grhs RightArrow)) guards
521+ HsLet NoExt localBinds e -> do
522+ txt "let "
523+ sitcc (located localBinds p_hsLocalBinds)
524+ vlayout space (newline >> space)
525+ txt "in "
526+ sitcc (located e p_hsExpr)
527+ HsDo NoExt ctx es -> do
675528 let doBody header = do
676529 txt header
677− breakpoint
678− ub <- layoutToBraces <$> getLayout
679− inci $
680− sepSemi
681− (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
682− (unLoc es)
683− compBody = brackets N . located es $ \xs -> do
530+ newline
531+ inci $ located es (newlineSep (located' (sitcc . p_stmt)))
532+ compBody = brackets $ located es $ \xs -> do
684533 let p_parBody =
685− sep
686− (breakpoint >> txt "|" >> space)
687− p_seqBody
534+ sequence_ .
535+ intersperse breakpoint .
536+ withSep (txt "| ") p_seqBody
688537 p_seqBody =
689− sitcc
690− . sep
691− commaDel
692− (located' (sitcc . p_stmt))
538+ sequence_ .
539+ intersperse (vlayout (pure ()) newline) .
540+ withSep comma (located' (sitcc . p_stmt))
693541 stmts = init xs
694542 yield = last xs
695543 lists = foldr (liftAppend . gatherStmt) [] stmts
696544 located yield p_stmt
697545 breakpoint
698− txt "|"
699− space
546+ txt "| "
700547 p_parBody lists
701548 case ctx of
702549 DoExpr -> doBody "do"
703550 MDoExpr -> doBody "mdo"
704551 ListComp -> compBody
705552 MonadComp -> notImplemented "MonadComp"
706− ArrowExpr -> notImplemented "ArrowExpr"
553+ ArrowExpr -> notImplemented "ArrowExpr"
707554 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
708555 PatGuard _ -> notImplemented "PatGuard"
709556 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
710557 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
711558 ExplicitList _ _ xs ->
712− brackets s $
713− sep commaDel (sitcc . located' p_hsExpr) xs
559+ brackets $ velt (withSep comma (located' p_hsExpr) xs)
714560 RecordCon {..} -> do
715561 located rcon_con_name atom
716562 breakpoint
717563 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) <$> rec_flds
564+ fields = located' p_hsRecField <$> rec_flds
725565 dotdot =
726566 case rec_dotdot of
727567 Just {} -> [txt ".."]
728568 Nothing -> []
729− inci . braces N $
730− sep commaDel sitcc (fields <> dotdot)
569+ inci $ braces $ velt (withSep comma id (fields <> dotdot))
731570 RecordUpd {..} -> do
732571 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
572+ breakpoint
573+ inci $ braces $ velt (withSep comma (located' p_hsRecField) rupd_flds)
574+ ExprWithTySig affix x -> sitcc $ do
754575 located x p_hsExpr
755− space
756− txt "::"
757576 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 ->
577+ inci $ do
578+ txt ":: "
579+ let HsWC {..} = affix
580+ HsIB {..} = hswc_body
581+ located hsib_body p_hsType
582+ ArithSeq NoExt _ x -> do
762583 case x of
763− From from -> brackets s $ do
584+ From from -> brackets $ do
764585 located from p_hsExpr
765586 breakpoint
766587 txt ".."
767− FromThen from next -> brackets s $ do
768− sep commaDel (located' p_hsExpr) [from, next]
588+ FromThen from next -> brackets $ do
589+ velt (withSep comma (located' p_hsExpr) [from, next])
769590 breakpoint
770591 txt ".."
771− FromTo from to -> brackets s $ do
592+ FromTo from to -> brackets $ do
772593 located from p_hsExpr
773594 breakpoint
774− txt ".."
775− space
595+ txt ".. "
776596 located to p_hsExpr
777− FromThenTo from next to -> brackets s $ do
778− sep commaDel (located' p_hsExpr) [from, next]
597+ FromThenTo from next to -> brackets $ do
598+ velt (withSep comma (located' p_hsExpr) [from, next])
779599 breakpoint
780− txt ".."
781− space
600+ txt ".. "
782601 located to p_hsExpr
783− HsSCC NoExtField _ name x -> do
602+ HsSCC NoExt _ name x -> do
784603 txt "{-# SCC "
785604 atom name
786605 txt " #-}"
787606 breakpoint
788607 located x p_hsExpr
789− HsCoreAnn NoExtField _ value x -> do
608+ HsCoreAnn NoExt _ value x -> do
790609 txt "{-# CORE "
791610 atom value
792611 txt " #-}"
793612 breakpoint
794613 located x p_hsExpr
795− HsBracket NoExtField x -> p_hsBracket x
614+ HsBracket NoExt x -> p_hsBracket x
796615 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
797616 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
798− HsSpliceE NoExtField splice -> p_hsSplice splice
799− HsProc NoExtField p e -> do
617+ HsSpliceE NoExt splice -> p_hsSplice splice
618+ HsProc NoExt p e -> do
800619 txt "proc"
801− located p $ \x -> do
620+ located p $ \x -> do
802621 breakpoint
803622 inci (p_pat x)
804623 breakpoint
805624 txt "->"
806− placeHanging (cmdTopPlacement (unLoc e)) $
807− located e p_hsCmdTop
808− HsStatic _ e -> do
625+ placeHanging (cmdTopPlacement (unLoc e)) (located e p_hsCmdTop)
626+ HsStatic _ e -> do
809627 txt "static"
810628 breakpoint
811629 inci (located e p_hsExpr)
630+ HsArrApp NoExt body input arrType cond ->
631+ p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
632+ HsArrForm NoExt form mfixity cmds ->
633+ p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
812634 HsTick {} -> notImplemented "HsTick"
813635 HsBinTick {} -> notImplemented "HsBinTick"
814636 HsTickPragma {} -> notImplemented "HsTickPragma"
637+ EWildPat NoExt -> txt "_"
638+ EAsPat {} -> notImplemented "EAsPat"
639+ EViewPat {} -> notImplemented "EViewPat"
640+ ELazyPat {} -> notImplemented "ELazyPat"
815641 HsWrap {} -> notImplemented "HsWrap"
816− XExpr x -> noExtCon x
642+ XExpr {} -> notImplemented "XExpr"
817643
818644p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
819645p_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
646+ txt "pattern "
647+ let nonEmptySynDetails = \case
648+ PrefixCon (_:_) -> True
649+ RecCon (_:_) -> True
650+ _ -> False
651+ case psb_dir of
652+ Unidirectional -> do
843653 p_rdrName psb_id
844− inci $ do
845− switchLayout (getLoc <$> xs) $ do
846− unless (null xs) breakpoint
847− sitcc (sep breakpoint p_rdrName xs)
848− rhs
849− RecCon xs -> do
850− space
654+ when (nonEmptySynDetails psb_args) space
655+ p_patSynDetails psb_args
656+ txt " <-"
657+ breakpoint
658+ inci (located psb_def p_pat)
659+ ImplicitBidirectional -> do
660+ p_rdrName psb_id
661+ when (nonEmptySynDetails psb_args) space
662+ p_patSynDetails psb_args
663+ txt " ="
664+ breakpoint
665+ inci (located psb_def p_pat)
666+ ExplicitBidirectional mgroup -> do
851667 p_rdrName psb_id
668+ when (nonEmptySynDetails psb_args) space
669+ p_patSynDetails psb_args
670+ txt " <-"
671+ breakpoint
672+ inci (located psb_def p_pat)
673+ newline
852674 inci $ do
853− switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
854− unless (null xs) breakpoint
855− braces N $
856− sep commaDel (p_rdrName . recordPatSynPatVar) xs
857− rhs
858− InfixCon l r -> do
859− switchLayout [getLoc l, getLoc r] $ do
860− space
861− p_rdrName l
862− breakpoint
863− inci $ do
864− p_rdrName psb_id
865− space
866− p_rdrName r
867− inci rhs
868−p_patSynBind (XPatSynBind x) = noExtCon x
869−
870−p_case ::
871− Data body =>
872− -- | Placer
873− (body -> Placement) ->
874− -- | Render
875− (body -> R ()) ->
876− -- | Expression
877− LHsExpr GhcPs ->
878− -- | Match group
879− MatchGroup GhcPs (Located body) ->
880− R ()
881−p_case placer render e mgroup = do
882− txt "case"
883− space
884− located e p_hsExpr
885− space
886− txt "of"
887− breakpoint
888− inci (p_matchGroup' placer render Case mgroup)
889−
890−p_if ::
891− Data body =>
892− -- | Placer
893− (body -> Placement) ->
894− -- | Render
895− (body -> R ()) ->
896− -- | If
897− LHsExpr GhcPs ->
898− -- | Then
899− Located body ->
900− -- | Else
901− Located body ->
902− R ()
903−p_if placer render if' then' else' = do
904− txt "if"
905− space
906− located if' p_hsExpr
907− breakpoint
908− inci $ do
909− txt "then"
910− space
911− located then' $ \x ->
912− placeHanging (placer x) (render x)
913− breakpoint
914− txt "else"
915− space
916− located else' $ \x ->
917− placeHanging (placer x) (render x)
918−
919−p_let ::
920− Data body =>
921− -- | Render
922− (body -> R ()) ->
923− Located (HsLocalBindsLR GhcPs GhcPs) ->
924− Located body ->
925− R ()
926−p_let render localBinds e = sitcc $ do
927− txt "let"
928− space
929− dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
930− vlayout space (newline >> txt " ")
931− txt "in"
932− space
933− sitcc (located e render)
675+ line (txt "where")
676+ inci (p_matchGroup (Function psb_id) mgroup)
677+p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
678+
679+p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
680+p_patSynDetails = \case
681+ PrefixCon xs ->
682+ velt' (p_rdrName <$> xs)
683+ RecCon xs ->
684+ velt' (p_rdrName . recordPatSynPatVar <$> xs)
685+ InfixCon _ _ -> notImplemented "InfixCon"
934686
935687p_pat :: Pat GhcPs -> R ()
936688p_pat = \case
937− WildPat NoExtField -> txt "_"
938− VarPat NoExtField name -> p_rdrName name
939− LazyPat NoExtField pat -> do
689+ WildPat NoExt -> txt "_"
690+ VarPat NoExt name -> p_rdrName name
691+ LazyPat NoExt pat -> do
940692 txt "~"
941693 located pat p_pat
942− AsPat NoExtField name pat -> do
694+ AsPat NoExt name pat -> do
943695 p_rdrName name
944696 txt "@"
945697 located pat p_pat
946− ParPat NoExtField pat ->
947− located pat (parens S . p_pat)
948− BangPat NoExtField pat -> do
698+ ParPat NoExt pat ->
699+ located pat (parens . p_pat)
700+ BangPat NoExt pat -> do
949701 txt "!"
950702 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' =
703+ ListPat NoExt pats -> do
704+ brackets $ velt (withSep comma (located' p_pat) pats)
705+ TuplePat NoExt pats boxing -> do
706+ let f =
955707 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)
708+ Boxed -> parens
709+ Unboxed -> parensHash
710+ f $ velt (withSep comma (located' p_pat) pats)
711+ SumPat NoExt pat _ _ -> do
712+ -- XXX I'm not sure about this one.
713+ located pat p_pat
961714 ConPatIn pat details ->
962715 case details of
963716 PrefixCon xs -> sitcc $ do
964717 p_rdrName pat
965718 unless (null xs) $ do
966719 breakpoint
967− inci . sitcc $ sep breakpoint (sitcc . located' p_pat) xs
720+ inci $ velt' (located' p_pat <$> xs)
968721 RecCon (HsRecFields fields dotdot) -> do
969722 p_rdrName pat
970723 breakpoint
971724 let f = \case
972725 Nothing -> txt ".."
973726 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
727+ inci . braces . velt . withSep comma f $ case dotdot of
728+ Nothing -> Just <$> fields
729+ Just n -> (Just <$> take n fields) ++ [Nothing]
730+ InfixCon x y -> do
731+ located x p_pat
732+ space
733+ p_rdrName pat
734+ breakpoint
735+ inci (located y p_pat)
986736 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
987− ViewPat NoExtField expr pat -> sitcc $ do
737+ ViewPat NoExt expr pat -> sitcc $ do
988738 located expr p_hsExpr
989− space
990− txt "->"
739+ txt " ->"
991740 breakpoint
992741 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
742+ SplicePat NoExt splice -> p_hsSplice splice
743+ LitPat NoExt p -> atom p
744+ NPat NoExt v _ _ -> located v (atom . ol_val)
745+ NPlusKPat NoExt n k _ _ _ -> sitcc $ do
997746 p_rdrName n
998747 breakpoint
999748 inci $ do
1000− txt "+"
1001− space
749+ txt "+ "
1002750 located k (atom . ol_val)
1003− SigPat NoExtField pat hswc -> do
751+ SigPat hswc pat -> do
1004752 located pat p_pat
1005753 p_typeAscription hswc
1006754 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
1007− XPat x -> noExtCon x
755+ XPat NoExt -> notImplemented "XPat"
1008756
1009757p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1010758p_pat_hsRecField HsRecField {..} = do
1011759 located hsRecFieldLbl $ \x ->
1012760 p_rdrName (rdrNameFieldOcc x)
1013761 unless hsRecPun $ do
1014− space
1015− equals
762+ txt " ="
1016763 breakpoint
1017764 inci (located hsRecFieldArg p_pat)
1018765
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−
1034766p_hsSplice :: HsSplice GhcPs -> R ()
1035767p_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
768+ HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
769+ HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
770+ HsQuasiQuote NoExt _ quoterName srcSpan str -> do
1039771 txt "["
1040772 p_rdrName (L srcSpan quoterName)
1041773 txt "|"
1042− -- QuasiQuoters often rely on precise custom strings. We cannot do any
1043− -- formatting here without potentially breaking someone's code.
774+ -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
775+ -- any formatting here without potentially breaking someone's code.
1044776 atom str
1045777 txt "|]"
1046778 HsSpliced {} -> notImplemented "HsSpliced"
1047− HsSplicedT {} -> notImplemented "HsSplicedT"
1048− XSplice x -> noExtCon x
779+ XSplice {} -> notImplemented "XSplice"
1049780
1050−p_hsSpliceTH ::
1051− -- | Typed splice?
1052− Bool ->
1053− -- | Splice expression
1054− LHsExpr GhcPs ->
1055− -- | Splice decoration
1056− SpliceDecoration ->
1057− R ()
781+p_hsSpliceTH
782+ :: Bool -- ^ Typed splice?
783+ -> LHsExpr GhcPs -- ^ Splice expression
784+ -> SpliceDecoration -- ^ Splice decoration
785+ -> R ()
1058786p_hsSpliceTH isTyped expr = \case
1059787 HasParens -> do
1060788 txt decoSymbol
1061− parens N (located expr (sitcc . p_hsExpr))
789+ parens (located expr (sitcc . p_hsExpr))
1062790 HasDollar -> do
1063791 txt decoSymbol
1064792 located expr (sitcc . p_hsExpr)
1065− NoParens ->
793+ NoParens -> do
1066794 located expr (sitcc . p_hsExpr)
1067795 where
1068796 decoSymbol = if isTyped then "$$" else "$"
1069797
1070798p_hsBracket :: HsBracket GhcPs -> R ()
1071799p_hsBracket = \case
1072− ExpBr NoExtField expr -> do
1073− anns <- getEnclosingAnns
1074− let name = case anns of
1075− AnnOpenEQ : _ -> ""
1076− _ -> "e"
1077− quote name (located expr p_hsExpr)
1078− PatBr NoExtField pat -> located pat (quote "p" . p_pat)
1079− DecBrL NoExtField decls -> quote "d" (p_hsDecls Free decls)
1080− DecBrG NoExtField _ -> notImplemented "DecBrG" -- result of renamer
1081− TypBr NoExtField ty -> quote "t" (located ty p_hsType)
1082− VarBr NoExtField isSingleQuote name -> do
800+ ExpBr NoExt expr -> quote "e" (located expr p_hsExpr)
801+ PatBr NoExt pat -> quote "p" (located pat p_pat)
802+ DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
803+ DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
804+ TypBr NoExt ty -> quote "t" (located ty p_hsType)
805+ VarBr NoExt isSingleQuote name -> do
1083806 txt (bool "''" "'" isSingleQuote)
1084807 -- HACK As you can see we use 'noLoc' here to be able to pass name into
1085808 -- 'p_rdrName' since the latter expects a "located" thing. The problem
@@ -1087,20 +810,16 @@ p_hsBracket = \case
1087810 -- turn makes it impossible to detect if there are parentheses around
1088811 -- it, etc. So we have to add parentheses manually assuming they are
1089812 -- 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
813+ let isOperator = any isPunctuation (showOutputable name)
814+ wrapper = if isOperator then parens else id
1096815 wrapper $ p_rdrName (noLoc name)
1097− TExpBr NoExtField expr -> do
816+ TExpBr NoExt expr -> do
1098817 txt "[||"
1099818 breakpoint'
1100819 located expr p_hsExpr
1101820 breakpoint'
1102821 txt "||]"
1103− XBracket x -> noExtCon x
822+ XBracket {} -> notImplemented "XBracket"
1104823 where
1105824 quote :: Text -> R () -> R ()
1106825 quote name body = do
@@ -1108,70 +827,16 @@ p_hsBracket = \case
1108827 txt name
1109828 txt "|"
1110829 breakpoint'
1111− inci $ do
1112− dontUseBraces body
1113− breakpoint'
1114− txt "|]"
1115−
1116−-- Print the source text of a string literal while indenting
1117−-- gaps correctly.
1118−
1119−p_stringLit :: String -> R ()
1120−p_stringLit src =
1121− let s = splitGaps src
1122− singleLine =
1123− txt $ Text.pack (mconcat s)
1124− multiLine =
1125− sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126− in vlayout singleLine multiLine
1127− where
1128− -- Split a string on gaps (backslash delimited whitespaces)
1129− --
1130− -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131− splitGaps :: String -> [String]
1132− splitGaps "" = []
1133− splitGaps s =
1134− let -- A backslash and a whitespace starts a "gap"
1135− p (Just '\\', _, _) = True
1136− p (_, '\\', Just c) | ghcSpace c = False
1137− p _ = True
1138− in case span p (zipPrevNext s) of
1139− (l, r) ->
1140− let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141− r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142− in map orig l : splitGaps r'
1143− -- GHC's definition of whitespaces in strings
1144− -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145− ghcSpace :: Char -> Bool
1146− ghcSpace c = c <= '\x7f' && is_space c
1147− -- Add backslashes to the inner side of the strings
1148− --
1149− -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150− backslashes :: [String] -> [String]
1151− backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152− backslashes xs = xs
1153− -- Attaches previous and next items to each list element
1154− zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1155− zipPrevNext xs =
1156− let z =
1157− zip
1158− (zip (Nothing : map Just xs) xs)
1159− (map Just (tail xs) ++ repeat Nothing)
1160− in map (\((p, x), n) -> (p, x, n)) z
1161− orig (_, x, _) = x
830+ body
831+ breakpoint'
832+ txt "|]"
1162833
1163834----------------------------------------------------------------------------
1164835-- Helpers
1165836
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−
1173837-- | Append each element in both lists with semigroups. If one list is shorter
1174838-- than the other, return the rest of the longer list unchanged.
839+
1175840liftAppend :: Semigroup a => [a] -> [a] -> [a]
1176841liftAppend [] [] = []
1177842liftAppend [] (y : ys) = y : ys
@@ -1179,15 +844,15 @@ liftAppend (x : xs) [] = x : xs
1179844liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
1180845
1181846getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1182−getGRHSSpan (GRHS NoExtField guards body) =
1183− combineSrcSpans' $ getLoc body :| map getLoc guards
1184−getGRHSSpan (XGRHS x) = noExtCon x
847+getGRHSSpan (GRHS NoExt _ body) = getLoc body
848+getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1185849
1186850-- | Place a thing that may have a hanging form. This function handles how
1187851-- to separate it from preceding expressions and whether to bump indentation
1188852-- depending on what sort of expression we have.
853+
1189854placeHanging :: Placement -> R () -> R ()
1190−placeHanging placement m =
855+placeHanging placement m = do
1191856 case placement of
1192857 Hanging -> do
1193858 space
@@ -1198,165 +863,49 @@ placeHanging placement m =
1198863
1199864-- | Check if given block contains single expression which has a hanging
1200865-- form.
1201−blockPlacement ::
1202− (body -> Placement) ->
1203− [LGRHS GhcPs (Located body)] ->
1204− Placement
1205−blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
866+
867+blockPlacement
868+ :: (body -> Placement)
869+ -> [LGRHS GhcPs (Located body)]
870+ -> Placement
871+blockPlacement placer [(L _ (GRHS NoExt _ (L _ x)))] = placer x
1206872blockPlacement _ _ = Normal
1207873
1208874-- | Check if given command has a hanging form.
875+
1209876cmdPlacement :: HsCmd GhcPs -> Placement
1210877cmdPlacement = \case
1211− HsCmdLam NoExtField _ -> Hanging
1212− HsCmdCase NoExtField _ _ -> Hanging
1213− HsCmdDo NoExtField _ -> Hanging
878+ HsCmdLam NoExt _ -> Hanging
879+ HsCmdCase NoExt _ _ -> Hanging
880+ HsCmdDo NoExt _ -> Hanging
1214881 _ -> Normal
1215882
1216883cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1217884cmdTopPlacement = \case
1218− HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219− XCmdTop x -> noExtCon x
885+ HsCmdTop NoExt (L _ x) -> cmdPlacement x
886+ XCmdTop {} -> notImplemented "XCmdTop"
1220887
1221888-- | Check if given expression has a hanging form.
889+
1222890exprPlacement :: HsExpr GhcPs -> Placement
1223891exprPlacement = \case
1224− -- Only hang lambdas with single line parameter lists
1225− HsLam NoExtField mg -> case mg of
1226− MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
1227− | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
1228− Hanging
1229− _ -> Normal
1230− HsLamCase NoExtField _ -> Hanging
1231− HsCase NoExtField _ _ -> Hanging
1232− HsDo NoExtField DoExpr _ -> Hanging
1233− HsDo NoExtField MDoExpr _ -> Hanging
1234− OpApp NoExtField _ op y ->
1235− case (fmap getOpNameStr . getOpName . unLoc) op of
1236− Just "$" -> exprPlacement (unLoc y)
1237− _ -> Normal
1238− HsApp NoExtField _ y -> exprPlacement (unLoc y)
1239− HsProc NoExtField p _ ->
1240− -- Indentation breaks if pattern is longer than one line and left
1241− -- hanging. Consequently, only apply hanging when it is safe.
1242− if isOneLineSpan (getLoc p)
1243− then Hanging
1244− else Normal
892+ HsLam NoExt _ -> Hanging
893+ HsLamCase NoExt _ -> Hanging
894+ HsCase NoExt _ _ -> Hanging
895+ HsDo NoExt DoExpr _ -> Hanging
896+ HsDo NoExt MDoExpr _ -> Hanging
897+ RecordCon NoExt _ _ -> Hanging
898+ HsProc NoExt (L s _) _ ->
899+ -- Indentation breaks if pattern is longer than one line and left hanging.
900+ -- Consequentally, once apply hanging when it is safe.
901+ if isOneLineSpan s
902+ then Hanging
903+ else Normal
1245904 _ -> Normal
1246905
1247906withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1248907withGuards = any (checkOne . unLoc)
1249908 where
1250909 checkOne :: GRHS GhcPs (Located body) -> Bool
1251− checkOne (GRHS NoExtField [] _) = False
910+ checkOne (GRHS NoExt [] _) = False
1252911 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')