@@ -1,43 +1,44 @@
1−{-# LANGUAGE LambdaCase #-}
1+{-# LANGUAGE LambdaCase #-}
2−{-# LANGUAGE MultiWayIf #-}
3{-# LANGUAGE OverloadedStrings #-}
2{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE RecordWildCards #-}
3+{-# LANGUAGE RecordWildCards #-}
5−{-# LANGUAGE TypeApplications #-}
7module Ormolu.Printer.Meat.Declaration.Value
5module Ormolu.Printer.Meat.Declaration.Value
8− ( p_valDecl,
6+ ( p_valDecl
16import Bag (bagToList)
10import Bag (bagToList)
18import Control.Monad
11import Control.Monad
19−import Ctype (is_space)
12+import Data.List (sortOn)
20−import Data.Bool (bool)
21−import Data.Char (isPunctuation, isSymbol)
22−import Data.Data hiding (Infix, Prefix)
23−import Data.Functor ((<&>))
24−import Data.List (intersperse, sortOn)
25−import Data.List.NonEmpty (NonEmpty (..), (<|))
26−import qualified Data.List.NonEmpty as NE
27−import Data.Text (Text)
28−import qualified Data.Text as Text
30−import OccName (occNameString)
31import Ormolu.Printer.Combinators
14import Ormolu.Printer.Combinators
32−import Ormolu.Printer.Internal
33import Ormolu.Printer.Meat.Common
15import Ormolu.Printer.Meat.Common
34−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
35−import Ormolu.Printer.Meat.Declaration.Signature
36import Ormolu.Printer.Meat.Type
16import Ormolu.Printer.Meat.Type
37−import Ormolu.Printer.Operators
17+import Ormolu.Printer.Meat.Declaration.Pat
18+import Ormolu.Printer.Meat.Declaration.Signature
38import Ormolu.Utils
19import Ormolu.Utils
20+import SrcLoc (isOneLineSpan)
21+import qualified Data.List.NonEmpty as NE
23+p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
24+p_valDecl = line . p_valDecl'
26+p_valDecl' :: HsBindLR GhcPs GhcPs -> R ()
28+ FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
29+ PatBind NoExt pat grhss _ -> p_match PatternBind [pat] grhss
30+ VarBind {} -> error "VarBinds are introduced by the type checker"
31+ AbsBinds {} -> error "AbsBinds are introduced by the type checker"
32+ PatSynBind NoExt psb -> p_patSynBind psb
33+ XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
37+ -> MatchGroup GhcPs (LHsExpr GhcPs)
39+p_funBind name mgroup =
40+ p_matchGroup (Function name) mgroup
40−-- | Style of a group of equations.
41data MatchGroupStyle
42data MatchGroupStyle
42 = Function (Located RdrName)
43 = Function (Located RdrName)
43 | PatternBind
44 | PatternBind
@@ -45,1318 +46,259 @@ data MatchGroupStyle
46 | LambdaCase
47 | LambdaCase
48−-- | Style of equations in a group.
49+p_matchGroup
49−data GroupStyle
50+ :: MatchGroupStyle
50− = EqualSign
51+ -> MatchGroup GhcPs (LHsExpr GhcPs)
51− | RightArrow
52+ -> R ()
52−
53+p_matchGroup style MG {..} =
53−-- | Expression placement. This marks the places where expressions that
54+ locatedVia Nothing mg_alts $
54−-- implement handing forms may use them.
55+ newlineSep (located' (\Match {..} -> p_match style m_pats m_grhss))
55−data Placement
56+p_matchGroup _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
56− = -- | Multi-line layout should cause
57+
57− -- insertion of a newline and indentation
58+p_match
58− -- bump
59+ :: MatchGroupStyle
59− Normal
60+ -> [LPat GhcPs]
60− | -- | Expressions that have hanging form
61+ -> GRHSs GhcPs (LHsExpr GhcPs)
61− -- should use it and avoid bumping one level
62+ -> R ()
62− -- of indentation
63+p_match style m_pats m_grhss = do
63− Hanging
64+ case style of
64− deriving (Eq, Show)
65+ Function name -> p_rdrName name
66−p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
67+ -- NOTE Normally, since patterns may be placed in a multi-line layout, it
67−p_valDecl = \case
68+ -- is necessary to bump indentation for the pattern group so it's more
68− FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
69− PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
70− VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
71− AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
72− PatSynBind NoExtField psb -> p_patSynBind psb
73− XHsBindsLR x -> noExtCon x
77− MatchGroup GhcPs (LHsExpr GhcPs) ->
79−p_funBind name = p_matchGroup (Function name)
83− MatchGroup GhcPs (LHsExpr GhcPs) ->
85−p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
89− -- | How to get body placement
90− (body -> Placement) ->
91− -- | How to print body
93− -- | Style of this group of equations
96− MatchGroup GhcPs (Located body) ->
98−p_matchGroup' placer render style MG {..} = do
99− let ob = case style of
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)
108− p_Match m@Match {..} =
112− (adjustMatchGroupStyle m style)
117− p_Match (XMatch x) = noExtCon x
118−p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
120−-- | Function id obtained through pattern matching on 'FunBind' should not
121−-- be used to print the actual equations because the different ‘RdrNames’
122−-- used in the equations may have different “decorations” (such as backticks
123−-- and paretheses) associated with them. It is necessary to use per-equation
124−-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
125−-- name inside of 'Function' accordingly.
126−adjustMatchGroupStyle ::
130−adjustMatchGroupStyle m = \case
131− Function _ -> (Function . mc_fun . m_ctxt) m
134−matchStrictness :: Match id body -> SrcStrictness
135−matchStrictness match =
136− case m_ctxt match of
137− FunRhs {mc_strictness = s} -> s
141− -- | Style of the group
143− -- | Is this an infix match?
145− -- | Strictness prefix (FunBind)
147− -- | Argument patterns
150− GRHSs GhcPs (LHsExpr GhcPs) ->
152−p_match = p_match' exprPlacement p_hsExpr
156− -- | How to get body placement
157− (body -> Placement) ->
158− -- | How to print body
160− -- | Style of this group of equations
162− -- | Is this an infix match?
164− -- | Strictness prefix (FunBind)
166− -- | Argument patterns
169− GRHSs GhcPs (Located body) ->
171−p_match' placer render style isInfix strictness m_pats GRHSs {..} = do
172− -- Normally, since patterns may be placed in a multi-line layout, it is
173− -- necessary to bump indentation for the pattern group so it's more
174 -- indented than function name. This in turn means that indentation for
69 -- indented than function name. This in turn means that indentation for
175 -- the body should also be bumped. Normally this would mean that bodies
70 -- the body should also be bumped. Normally this would mean that bodies
176 -- would start with two indentation steps applied, which is ugly, so we
71 -- would start with two indentation steps applied, which is ugly, so we
177 -- need to be a bit more clever here and bump indentation level only when
72 -- need to be a bit more clever here and bump indentation level only when
178 -- pattern group is multiline.
73 -- pattern group is multiline.
179− case strictness of
74+ inci' <- case NE.nonEmpty m_pats of
180− NoSrcStrict -> return ()
75+ Nothing -> return id
181− SrcStrict -> txt "!"
183− indentBody <- case NE.nonEmpty m_pats of
185− False <$ case style of
186− Function name -> p_rdrName name
188 Just ne_pats -> do
76 Just ne_pats -> do
189− let combinedSpans = case style of
77+ let combinedSpans = combineSrcSpans' $
190− Function name -> combineSrcSpans (getLoc name) patSpans
78+ getSpan <$> ne_pats
191− _ -> patSpans
79+ inci' = if isOneLineSpan combinedSpans
192− patSpans = combineSrcSpans' (getLoc <$> ne_pats)
80+ then id
193− indentBody = not (isOneLineSpan combinedSpans)
81+ else inci
194− switchLayout [combinedSpans] $ do
82+ switchLayout combinedSpans $ do
195− let stdCase = sep breakpoint (located' p_pat) m_pats
196 case style of
83 case style of
197− Function name ->
84+ Function _ -> breakpoint
198− p_infixDefHelper
85+ PatternBind -> return ()
199− isInfix
86+ Case -> return ()
200− indentBody
87+ Lambda -> txt "\\"
201− (p_rdrName name)
88+ LambdaCase -> return ()
202− (located' p_pat <$> m_pats)
89+ let wrapper = case style of
203− PatternBind -> stdCase
90+ Function _ -> inci'
204− Case -> stdCase
91+ _ -> id
205− Lambda -> do
92+ wrapper (velt' (located' p_pat <$> m_pats))
206− let needsSpace = case unLoc (NE.head ne_pats) of
93+ return inci'
207− LazyPat _ _ -> True
94+ inci' $ do
208− BangPat _ _ -> True
95+ let GRHSs {..} = m_grhss
209− SplicePat _ _ -> True
96+ unless (length grhssGRHSs > 1) $ do
211− txt "\\"
98+ txt $ case style of
212− when needsSpace space
99+ Function _ -> "="
213− sitcc stdCase
100+ PatternBind -> "="
214− LambdaCase -> stdCase
101+ _ -> "->"
215− return indentBody
102+ let combinedSpans = combineSrcSpans' $
216− let -- Calculate position of end of patterns. This is useful when we decide
103+ getGRHSSpan . unL <$> NE.fromList grhssGRHSs
217− -- about putting certain constructions in hanging positions.
104+ case style of
218− endOfPats = case NE.nonEmpty m_pats of
105+ Lambda -> breakpoint
219− Nothing -> case style of
106+ _ -> return ()
220− Function name -> Just (getLoc name)
107+ switchLayout combinedSpans . inci $ do
222− Just pats -> (Just . getLoc . NE.last) pats
227− hasGuards = withGuards grhssGRHSs
230− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
234− (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
238− Nothing -> blockPlacement placer grhssGRHSs
240− if onTheSameLine spn grhssSpan
241− then blockPlacement placer grhssGRHSs
245− if isCase style && hasGuards
248− sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
250− let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
251− unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
254− unless whereIsEmpty breakpoint
255− inci $ located grhssLocalBinds p_hsLocalBinds
256− inciIf indentBody $ do
257− unless (length grhssGRHSs > 1) $
258 case style of
108 case style of
259− Function _ | hasGuards -> return ()
109+ Lambda -> return ()
260− Function _ -> space >> inci equals
110+ _ -> breakpoint
261− PatternBind -> space >> inci equals
111+ newlineSep (located' p_grhs) grhssGRHSs
262− s | isCase s && hasGuards -> return ()
112+ unless (GHC.isEmptyLocalBindsPR (unL grhssLocalBinds)) $ do
263− _ -> space >> txt "->"
113+ newline
264− switchLayout [patGrhssSpan] $
114+ line (txt "where")
265− placeHanging placement p_body
115+ inci (located grhssLocalBinds p_hsLocalBinds)
267−p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
117+p_grhs :: GRHS GhcPs (LHsExpr GhcPs) -> R ()
268−
118+p_grhs (GRHS NoExt guards body) =
269−p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
270−p_grhs = p_grhs' exprPlacement p_hsExpr
274− -- | How to get body placement
275− (body -> Placement) ->
276− -- | How to print body
279− GRHS GhcPs (Located body) ->
281−p_grhs' placer render style (GRHS NoExtField guards body) =
282 case guards of
119 case guards of
283 [] -> p_body
120 [] -> p_body
285− txt "|"
122+ txt "| "
286− space
123+ velt $ withSep comma (located' p_stmt) xs
287− sitcc (sep commaDel (sitcc . located' p_stmt) xs)
124+ txt " ="
289− inci $ case style of
291− RightArrow -> txt "->"
292− placeHanging placement p_body
296− Nothing -> placer (unLoc body)
298− if onTheSameLine spn (getLoc body)
299− then placer (unLoc body)
302− case NE.nonEmpty guards of
304− Just gs -> (Just . getLoc . NE.last) gs
305− p_body = located body render
306−p_grhs' _ _ _ (XGRHS x) = noExtCon x
308−p_hsCmd :: HsCmd GhcPs -> R ()
310− HsCmdArrApp NoExtField body input arrType _ -> do
311− located body p_hsExpr
315− HsFirstOrderApp -> txt "-<"
316− HsHigherOrderApp -> txt "-<<"
317− placeHanging (exprPlacement (unLoc input)) $
318− located input p_hsExpr
319− HsCmdArrForm NoExtField form Prefix _ cmds -> banana $ do
320− located form p_hsExpr
321− unless (null cmds) $ do
322 breakpoint
125 breakpoint
323− inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
126+ inci p_body
324− HsCmdArrForm NoExtField form Infix _ [left, right] -> do
127+ where
325− located left p_hsCmdTop
128+ p_body = located body p_hsExpr
326− space
129+p_grhs (XGRHS NoExt) = notImplemented "XGRHS"
327− located form p_hsExpr
328− placeHanging (cmdTopPlacement (unLoc right)) $
329− located right p_hsCmdTop
330− HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
332− -- XXX Does this ever occur in the syntax tree? It does not seem like it
333− -- does. Open an issue and ping @yumiova if this ever occurs in output.
334− 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
347− sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
348− HsCmdWrap {} -> notImplemented "HsCmdWrap"
349− XCmd x -> noExtCon x
351−p_hsCmdTop :: HsCmdTop GhcPs -> R ()
353− HsCmdTop NoExtField cmd -> located cmd p_hsCmd
354− XCmdTop x -> noExtCon x
356−-- | Render an expression preserving blank lines between such consecutive
357−-- expressions found in the original source code.
359− -- | Rendering function
361− -- | Entity to render
364−withSpacing f l = located l $ \x -> do
366− UnhelpfulSpan _ -> f x
367− RealSrcSpan currentSpn -> do
368− getSpanMark >>= \case
369− -- Spacing before comments will be handled by the code
370− -- that prints comments, so we just have to deal with
371− -- blank lines between statements here.
372− Just (StatementSpan lastSpn) ->
373− if srcSpanStartLine currentSpn > srcSpanEndLine lastSpn + 1
378− -- In some cases the (f x) expression may insert a new mark. We want
379− -- to be careful not to override comment marks.
380− getSpanMark >>= \case
381− Just (HaddockSpan _ _) -> return ()
382− Just (CommentSpan _) -> return ()
383− _ -> setSpanMark (StatementSpan currentSpn)
385p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
131p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
386−p_stmt = p_stmt' exprPlacement p_hsExpr
132+p_stmt = \case
387−
133+ LastStmt {} -> notImplemented "do notation"
388−p_stmt' ::
134+ BindStmt {} -> notImplemented "do notation"
389− Data body =>
135+ ApplicativeStmt {} -> notImplemented "applicative stmt"
390− -- | Placer
136+ BodyStmt NoExt body _ _ -> located body p_hsExpr
391− (body -> Placement) ->
137+ LetStmt NoExt binds -> located binds p_hsLocalBinds
392− -- | Render
138+ ParStmt {} -> notImplemented "ParStmt"
393− (body -> R ()) ->
139+ TransStmt {} -> notImplemented "TransStmt"
394− -- | Statement to render
140+ RecStmt {} -> notImplemented "RecStmt"
395− Stmt GhcPs (Located body) ->
141+ XStmtLR {} -> notImplemented "XStmtLR"
397−p_stmt' placer render = \case
398− LastStmt NoExtField body _ _ -> located body render
399− BindStmt NoExtField p f _ _ -> do
408− (mkSrcSpan (srcSpanEnd loc) (srcSpanStart l'))
411− switchLayout [loc, getLoc f] $
412− placeHanging placement (located f render)
413− ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
414− BodyStmt NoExtField body _ _ -> located body render
415− LetStmt NoExtField binds -> do
418− sitcc $ located binds p_hsLocalBinds
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.
423− notImplemented "ParStmt"
425− -- 'TransStmt' only needs to account for render printing itself, since
426− -- pretty printing of relevant statements (e.g., in 'trS_stmts') is
427− -- handled through 'gatherStmt'.
428− case (trS_form, trS_by) of
429− (ThenForm, Nothing) -> do
432− inci $ located trS_using p_hsExpr
433− (ThenForm, Just e) -> do
436− inci $ located trS_using p_hsExpr
440− inci $ located e p_hsExpr
441− (GroupForm, Nothing) -> do
442− txt "then group using"
444− inci $ located trS_using p_hsExpr
445− (GroupForm, Just e) -> do
448− inci $ located e p_hsExpr
452− inci $ located trS_using p_hsExpr
456− sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457− XStmtLR c -> noExtCon c
459−gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
460−gatherStmt (L _ (ParStmt NoExtField block _ _)) =
461− foldr ((<>) . gatherStmtBlock) [] block
462−gatherStmt (L s stmt@TransStmt {..}) =
463− foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
464−gatherStmt stmt = [[stmt]]
466−gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
467−gatherStmtBlock (ParStmtBlock _ stmts _ _) =
468− foldr (liftAppend . gatherStmt) [] stmts
469−gatherStmtBlock (XParStmtBlock x) = noExtCon x
471p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
143p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
472p_hsLocalBinds = \case
144p_hsLocalBinds = \case
473− HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
145+ HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
474− -- When in a single-line layout, there is a chance that the inner
146+ let ssStart = either
475− -- elements will also contain semicolons and they will confuse the
147+ (srcSpanStart . getSpan)
476− -- parser. so we request braces around every element except the last.
148+ (srcSpanStart . getSpan)
477− br <- layoutToBraces <$> getLayout
149+ items =
478− let items =
150+ (Left <$> bagToList bag) ++ (Right <$> lsigs)
479− let injectLeft (L l x) = L l (Left x)
151+ p_item (Left x) = located x p_valDecl'
480− injectRight (L l x) = L l (Right x)
152+ p_item (Right x) = located x p_sigDecl'
481− in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
153+ newlineSep p_item (sortOn ssStart items)
482− positionToBracing = \case
154+ HsValBinds NoExt _ -> notImplemented "HsValBinds"
483− SinglePos -> id
155+ HsIPBinds NoExt _ -> notImplemented "HsIPBinds"
484− FirstPos -> br
156+ EmptyLocalBinds NoExt -> return ()
485− MiddlePos -> br
157+ XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
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
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
511− HsRecField' RdrName (LHsExpr GhcPs) ->
513−p_hsRecField HsRecField {..} = do
514− p_rdrName hsRecFieldLbl
515− unless hsRecPun $ do
519− if onTheSameLine (getLoc hsRecFieldLbl) (getLoc hsRecFieldArg)
520− then exprPlacement (unLoc hsRecFieldArg)
522− placeHanging placement (located hsRecFieldArg p_hsExpr)
524p_hsExpr :: HsExpr GhcPs -> R ()
159p_hsExpr :: HsExpr GhcPs -> R ()
525−p_hsExpr = p_hsExpr' N
160+p_hsExpr = \case
526−
161+ HsVar NoExt name -> p_rdrName name
527−p_hsExpr' :: BracketStyle -> HsExpr GhcPs -> R ()
162+ HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
528−p_hsExpr' s = \case
163+ HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
529− HsVar NoExtField name -> p_rdrName name
164+ HsRecFld NoExt x ->
530− HsUnboundVar NoExtField v -> atom (unboundVarOcc v)
531− HsConLikeOut NoExtField _ -> notImplemented "HsConLikeOut"
532− HsRecFld NoExtField x ->
533 case x of
165 case x of
534− Unambiguous NoExtField name -> p_rdrName name
166+ Unambiguous NoExt name -> p_rdrName name
535− Ambiguous NoExtField name -> p_rdrName name
167+ Ambiguous NoExt name -> p_rdrName name
536− XAmbiguousFieldOcc xx -> noExtCon xx
168+ XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
537− HsOverLabel NoExtField _ v -> do
169+ HsOverLabel NoExt _ _ -> notImplemented "HsOverLabel"
538− txt "#"
170+ HsIPVar NoExt (HsIPName name) -> atom name
539− atom v
171+ HsOverLit NoExt v -> atom (ol_val v)
540− HsIPVar NoExtField (HsIPName name) -> do
172+ HsLit NoExt lit -> atom lit
541− txt "?"
173+ HsLam NoExt mgroup ->
543− HsOverLit NoExtField v -> atom (ol_val v)
544− HsLit NoExtField lit ->
546− HsString (SourceText stxt) _ -> p_stringLit stxt
547− HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
549− HsLam NoExtField mgroup ->
550 p_matchGroup Lambda mgroup
174 p_matchGroup Lambda mgroup
551− HsLamCase NoExtField mgroup -> do
175+ HsLamCase NoExt mgroup -> do
552 txt "\\case"
176 txt "\\case"
553− breakpoint
177+ newline
554 inci (p_matchGroup LambdaCase mgroup)
178 inci (p_matchGroup LambdaCase mgroup)
555− HsApp NoExtField f x -> do
179+ HsApp NoExt f x -> do
556− let -- In order to format function applications with multiple parameters
180+ located f p_hsExpr
557− -- nicer, traverse the AST to gather the function and all the
181+ breakpoint
558− -- parameters together.
182+ inci (located x p_hsExpr)
559− gatherArgs f' knownArgs =
183+ HsAppType a e -> do
561− L _ (HsApp _ l r) -> gatherArgs l (r <| knownArgs)
562− _ -> (f', knownArgs)
563− (func, args) = gatherArgs f (x :| [])
564− -- We need to handle the last argument specially if it is a
565− -- hanging construct, so separate it from the rest.
566− (initp, lastp) = (NE.init args, NE.last args)
569− getLoc f :| [(srcLocSpan . srcSpanStart . getLoc) lastp]
570− -- Hang the last argument only if the initial arguments span one
573− if isOneLineSpan initSpan
574− then exprPlacement (unLoc lastp)
576− -- If the last argument is not hanging, just separate every argument as
577− -- usual. If it is hanging, print the initial arguments and hang the
578− -- last one. Also, use braces around the every argument except the last
582− let -- Usually we want to bump indentation for arguments for the
583− -- sake of readability. However, when the function itself is a
584− -- do-block or case expression it is not a good idea. It seems
585− -- to be safe to always bump indentation when the function
586− -- expression is parenthesised.
589− L _ (HsPar NoExtField _) -> True
590− L _ (HsAppType NoExtField _ _) -> True
591− L _ (HsMultiIf NoExtField _) -> True
592− L spn _ -> isOneLineSpan spn
595− SingleLine -> useBraces
598− located func (p_hsExpr' s)
600− inciIf doIndent $ sep breakpoint (located' p_hsExpr) initp
601− inciIf doIndent $ do
602− unless (null initp) breakpoint
603− located lastp p_hsExpr
605− useBraces . switchLayout [initSpan] $ do
606− located func (p_hsExpr' s)
608− sep breakpoint (located' p_hsExpr) initp
609− placeHanging placement $
610− located lastp p_hsExpr
611− HsAppType NoExtField e a -> do
612 located e p_hsExpr
184 located e p_hsExpr
613 breakpoint
185 breakpoint
614 inci $ do
186 inci $ do
616− -- Insert a space when the type is represented as a TH splice to avoid
617− -- gluing @ and $ together.
618− case unLoc (hswc_body a) of
619− HsSpliceTy {} -> space
621 located (hswc_body a) p_hsType
188 located (hswc_body a) p_hsType
622− OpApp NoExtField x op y -> do
189+ OpApp NoExt 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
629− HsPar NoExtField e ->
630− parens s (located e (dontUseBraces . p_hsExpr))
631− SectionL NoExtField x op -> do
632 located x p_hsExpr
190 located x p_hsExpr
633 breakpoint
191 breakpoint
634− inci (located op p_hsExpr)
192+ inci $ do
635− SectionR NoExtField op x -> do
193+ located op p_hsExpr
636− located op p_hsExpr
194+ space
637− useRecordDot' <- useRecordDot
195+ located y p_hsExpr
638− let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
196+ NegApp NoExt e _ -> do
639− unless (useRecordDot' && isRecordDot') breakpoint
197+ txt "-"
640− inci (located x p_hsExpr)
198+ located e p_hsExpr
641− ExplicitTuple NoExtField args boxity ->
199+ HsPar NoExt e -> parens (located e p_hsExpr)
642− let isSection = any (isMissing . unLoc) args
200+ SectionL {} -> notImplemented "SectionL"
643− isMissing = \case
201+ SectionR {} -> notImplemented "SectionR"
644− Missing NoExtField -> True
202+ ExplicitTuple {} -> notImplemented "ExplicitTuple"
645− _ -> False
203+ ExplicitSum {} -> notImplemented "ExplicitSum"
646− p_arg = \case
204+ HsCase NoExt e mgroup -> do
647− Present NoExtField x -> located x p_hsExpr
205+ txt "case "
648− Missing NoExtField -> pure ()
206+ located e p_hsExpr
649− XTupArg x -> noExtCon x
207+ txt " of"
650− p_larg = sitcc . located' p_arg
654− Unboxed -> parensHash
657− switchLayout [] . parens' s $
658− sep comma p_larg args
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
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
675− let doBody header = do
678− ub <- layoutToBraces <$> getLayout
681− (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
683− compBody = brackets N . located es $ \xs -> do
686− (breakpoint >> txt "|" >> space)
692− (located' (sitcc . p_stmt))
695− lists = foldr (liftAppend . gatherStmt) [] stmts
696− located yield p_stmt
702− DoExpr -> doBody "do"
703− MDoExpr -> doBody "mdo"
704− ListComp -> compBody
705− MonadComp -> notImplemented "MonadComp"
706− ArrowExpr -> notImplemented "ArrowExpr"
707− GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
708− PatGuard _ -> notImplemented "PatGuard"
709− ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
710− TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
711− ExplicitList _ _ xs ->
713− sep commaDel (sitcc . located' p_hsExpr) xs
714− RecordCon {..} -> do
715− located rcon_con_name atom
716 breakpoint
208 breakpoint
717− let HsRecFields {..} = rcon_flds
209+ inci (p_matchGroup Case mgroup)
718− updName f =
210+ HsIf NoExt _ if' then' else' -> do
719− (f :: HsRecField GhcPs (LHsExpr GhcPs))
211+ txt "if "
720− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
212+ located if' p_hsExpr
722− XFieldOcc x -> noExtCon x
724− fields = located' (p_hsRecField . updName) <$> rec_flds
727− Just {} -> [txt ".."]
730− sep commaDel sitcc (fields <> dotdot)
731− RecordUpd {..} -> do
732− located rupd_expr p_hsExpr
733− useRecordDot' <- useRecordDot
734− let mrs sp = case getLoc sp of
735− RealSrcSpan r -> Just r
738− ((1 +) . srcSpanEndCol <$> mrs rupd_expr)
739− == (srcSpanStartCol <$> mrs (head rupd_flds))
740− unless (useRecordDot' && isPluginForm) breakpoint
742− (f :: HsRecUpdField GhcPs)
743− { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
745− Unambiguous _ n -> n
746− XAmbiguousFieldOcc x -> noExtCon x
751− (sitcc . located' (p_hsRecField . updName))
753− ExprWithTySig NoExtField x HsWC {hswc_body = HsIB {..}} -> sitcc $ do
757 breakpoint
213 breakpoint
758− inci $ located hsib_body p_hsType
214+ txt "then"
759− ExprWithTySig NoExtField _ HsWC {hswc_body = XHsImplicitBndrs x} -> noExtCon x
215+ located then' $ \x -> do
760− ExprWithTySig NoExtField _ (XHsWildCardBndrs x) -> noExtCon x
216+ breakpoint
761− ArithSeq NoExtField _ x ->
217+ inci (p_hsExpr x)
763− From from -> brackets s $ do
764− located from p_hsExpr
767− FromThen from next -> brackets s $ do
768− sep commaDel (located' p_hsExpr) [from, next]
771− FromTo from to -> brackets s $ do
772− located from p_hsExpr
777− FromThenTo from next to -> brackets s $ do
778− sep commaDel (located' p_hsExpr) [from, next]
783− HsSCC NoExtField _ name x -> do
787 breakpoint
218 breakpoint
788− located x p_hsExpr
219+ txt "else"
789− HsCoreAnn NoExtField _ value x -> do
220+ located else' $ \x -> do
790− txt "{-# CORE "
221+ breakpoint
791− atom value
222+ inci (p_hsExpr x)
792− txt " #-}"
223+ HsMultiIf {} -> notImplemented "MulitiIf"
224+ HsLet NoExt localBinds e -> do
226+ sitcc (located localBinds p_hsLocalBinds)
793 breakpoint
227 breakpoint
794− located x p_hsExpr
228+ txt "in "
795− HsBracket NoExtField x -> p_hsBracket x
229+ sitcc (located e p_hsExpr)
230+ HsDo {} -> notImplemented "HsDo"
231+ ExplicitList _ _ xs -> do
232+ brackets $ velt (withSep comma (located' p_hsExpr) xs)
233+ RecordCon {} -> notImplemented "RecordCon"
234+ RecordUpd {} -> notImplemented "RecordUpd"
235+ ExprWithTySig {} -> notImplemented "ExprWithTySig"
236+ ArithSeq {} -> notImplemented "ArithSeq"
237+ HsSCC {} -> notImplemented "HsSCC"
238+ HsCoreAnn {} -> notImplemented "HsCoreAnn"
239+ HsBracket {} -> notImplemented "HsBracket"
796 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
240 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
797 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
241 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
798− HsSpliceE NoExtField splice -> p_hsSplice splice
242+ HsSpliceE {} -> notImplemented "HsSpliceE"
799− HsProc NoExtField p e -> do
243+ HsProc {} -> notImplemented "HsProc"
800− txt "proc"
244+ HsStatic _ e -> do
801− located p $ \x -> do
806− placeHanging (cmdTopPlacement (unLoc e)) $
807− located e p_hsCmdTop
809 txt "static"
245 txt "static"
810 breakpoint
246 breakpoint
811− inci (located e p_hsExpr)
247+ inci $ located e p_hsExpr
248+ HsArrApp {} -> notImplemented "HsArrApp"
249+ HsArrForm {} -> notImplemented "HsArrForm"
812 HsTick {} -> notImplemented "HsTick"
250 HsTick {} -> notImplemented "HsTick"
813 HsBinTick {} -> notImplemented "HsBinTick"
251 HsBinTick {} -> notImplemented "HsBinTick"
814 HsTickPragma {} -> notImplemented "HsTickPragma"
252 HsTickPragma {} -> notImplemented "HsTickPragma"
253+ EWildPat NoExt -> notImplemented "EWildPat"
254+ EAsPat {} -> notImplemented "EAsPat"
255+ EViewPat {} -> notImplemented "EViewPat"
256+ ELazyPat {} -> notImplemented "ELazyPat"
815 HsWrap {} -> notImplemented "HsWrap"
257 HsWrap {} -> notImplemented "HsWrap"
816− XExpr x -> noExtCon x
258+ XExpr {} -> notImplemented "XExpr"
818p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
260p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
819p_patSynBind PSB {..} = do
261p_patSynBind PSB {..} = do
820− let rhs = do
262+ txt "pattern "
821− space
263+ case psb_dir of
822− case psb_dir of
264+ Unidirectional -> do
823− Unidirectional -> do
265+ p_rdrName psb_id
826− located psb_def p_pat
827− ImplicitBidirectional -> do
830− located psb_def p_pat
831− ExplicitBidirectional mgroup -> do
834− located psb_def p_pat
838− inci (p_matchGroup (Function psb_id) mgroup)
267+ p_patSynDetails psb_args
270+ inci (located psb_def p_pat)
271+ ImplicitBidirectional -> do
843 p_rdrName psb_id
272 p_rdrName psb_id
845− switchLayout (getLoc <$> xs) $ do
846− unless (null xs) breakpoint
847− sitcc (sep breakpoint p_rdrName xs)
274+ p_patSynDetails psb_args
277+ located psb_def p_pat
278+ ExplicitBidirectional mgroup -> do
851 p_rdrName psb_id
279 p_rdrName psb_id
853− switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
854− unless (null xs) breakpoint
856− sep commaDel (p_rdrName . recordPatSynPatVar) xs
859− switchLayout [getLoc l, getLoc r] $ do
868−p_patSynBind (XPatSynBind x) = noExtCon x
873− (body -> Placement) ->
879− MatchGroup GhcPs (Located body) ->
881−p_case placer render e mgroup = do
888− inci (p_matchGroup' placer render Case mgroup)
893− (body -> Placement) ->
903−p_if placer render if' then' else' = do
906− located if' p_hsExpr
911− located then' $ \x ->
912− placeHanging (placer x) (render x)
916− located else' $ \x ->
917− placeHanging (placer x) (render x)
923− Located (HsLocalBindsLR GhcPs GhcPs) ->
926−p_let render localBinds e = sitcc $ do
929− dontUseBraces $ sitcc (located localBinds p_hsLocalBinds)
930− vlayout space (newline >> txt " ")
933− sitcc (located e render)
935−p_pat :: Pat GhcPs -> R ()
937− WildPat NoExtField -> txt "_"
938− VarPat NoExtField name -> p_rdrName name
939− LazyPat NoExtField pat -> do
942− AsPat NoExtField name pat -> do
946− ParPat NoExtField pat ->
947− located pat (parens S . p_pat)
948− BangPat NoExtField pat -> do
951− ListPat NoExtField pats ->
952− brackets S $ sep commaDel (located' p_pat) pats
953− TuplePat NoExtField pats boxing -> do
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)
961− ConPatIn pat details ->
963− PrefixCon xs -> sitcc $ do
965− unless (null xs) $ do
967− inci . sitcc $ sep breakpoint (sitcc . located' p_pat) xs
968− RecCon (HsRecFields fields dotdot) -> do
973− Just x -> located x p_pat_hsRecField
974− inci . braces N . sep commaDel f $
976− Nothing -> Just <$> fields
977− Just (L _ n) -> (Just <$> take n fields) ++ [Nothing]
979− switchLayout [getLoc l, getLoc r] $ do
986− ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
987− ViewPat NoExtField expr pat -> sitcc $ do
988− located expr p_hsExpr
992− 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
1002− located k (atom . ol_val)
281+ p_patSynDetails psb_args
1003− SigPat NoExtField pat hswc -> do
282+ txt " <-"
1004− located pat p_pat
283+ breakpoint
1005− p_typeAscription hswc
284+ inci (located psb_def p_pat)
1006− CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
285+ newline
1007− XPat x -> noExtCon x
1009−p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1010−p_pat_hsRecField HsRecField {..} = do
1011− located hsRecFieldLbl $ \x ->
1012− p_rdrName (rdrNameFieldOcc x)
1013− unless hsRecPun $ do
1017− inci (located hsRecFieldArg p_pat)
1019−p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
1020−p_unboxedSum s tag arity m = do
1021− let before = tag - 1
1022− after = arity - before - 1
1023− args = replicate before Nothing <> [Just m] <> replicate after Nothing
1025− case x :: Maybe (R ()) of
1032− parensHash s $ sep (txt "|") f args
1034−p_hsSplice :: HsSplice GhcPs -> R ()
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
1040− p_rdrName (L srcSpan quoterName)
1042− -- QuasiQuoters often rely on precise custom strings. We cannot do any
1043− -- formatting here without potentially breaking someone's code.
1046− HsSpliced {} -> notImplemented "HsSpliced"
1047− HsSplicedT {} -> notImplemented "HsSplicedT"
1048− XSplice x -> noExtCon x
1053− -- | Splice expression
1055− -- | Splice decoration
1056− SpliceDecoration ->
1058−p_hsSpliceTH isTyped expr = \case
1061− parens N (located expr (sitcc . p_hsExpr))
1064− located expr (sitcc . p_hsExpr)
1066− located expr (sitcc . p_hsExpr)
1068− decoSymbol = if isTyped then "$$" else "$"
1070−p_hsBracket :: HsBracket GhcPs -> R ()
1072− ExpBr NoExtField expr -> do
1073− anns <- getEnclosingAnns
1074− let name = case anns of
1075− AnnOpenEQ : _ -> ""
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
1083− txt (bool "''" "'" isSingleQuote)
1084− -- HACK As you can see we use 'noLoc' here to be able to pass name into
1085− -- 'p_rdrName' since the latter expects a "located" thing. The problem
1086− -- is that 'VarBr' doesn't provide us with location of the name. This in
1087− -- turn makes it impossible to detect if there are parentheses around
1088− -- it, etc. So we have to add parentheses manually assuming they are
1089− -- necessary for all operators.
1092− (\i -> isPunctuation i || isSymbol i)
1093− (showOutputable (rdrNameOcc name))
1094− && not (doesNotNeedExtraParens name)
1095− wrapper = if isOperator then parens N else id
1096− wrapper $ p_rdrName (noLoc name)
1097− TExpBr NoExtField expr -> do
1100− located expr p_hsExpr
1103− XBracket x -> noExtCon x
1105− quote :: Text -> R () -> R ()
1106− quote name body = do
1111 inci $ do
286 inci $ do
1112− dontUseBraces body
287+ line (txt "where")
1113− breakpoint'
288+ inci (p_matchGroup (Function psb_id) mgroup)
1114− txt "|]"
289+p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
1116−-- Print the source text of a string literal while indenting
291+p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
1117−-- gaps correctly.
292+p_patSynDetails = \case
1118−
293+ PrefixCon xs ->
1119−p_stringLit :: String -> R ()
294+ velt' (p_rdrName <$> xs)
1120−p_stringLit src =
295+ RecCon xs ->
1121− let s = splitGaps src
296+ velt' (p_rdrName . recordPatSynPatVar <$> xs)
1122− singleLine =
297+ InfixCon _ _ -> notImplemented "InfixCon"
1123− txt $ Text.pack (mconcat s)
1125− sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126− in vlayout singleLine multiLine
1128− -- Split a string on gaps (backslash delimited whitespaces)
1130− -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131− splitGaps :: String -> [String]
1134− let -- A backslash and a whitespace starts a "gap"
1135− p (Just '\\', _, _) = True
1136− p (_, '\\', Just c) | ghcSpace c = False
1138− in case span p (zipPrevNext s) of
1140− let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141− r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142− in map orig l : splitGaps r'
1143− -- GHC's definition of whitespaces in strings
1144− -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145− ghcSpace :: Char -> Bool
1146− ghcSpace c = c <= '\x7f' && is_space c
1147− -- Add backslashes to the inner side of the strings
1149− -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150− backslashes :: [String] -> [String]
1151− backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152− backslashes xs = xs
1153− -- Attaches previous and next items to each list element
1154− zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1158− (zip (Nothing : map Just xs) xs)
1159− (map Just (tail xs) ++ repeat Nothing)
1160− in map (\((p, x), n) -> (p, x, n)) z
1163----------------------------------------------------------------------------
299----------------------------------------------------------------------------
1164-- Helpers
300-- Helpers
1166−-- | Return the wrapping function controlling the use of braces according to
302+getGRHSSpan :: GRHS GhcPs (LHsExpr GhcPs) -> SrcSpan
1167−-- the current layout.
303+getGRHSSpan (GRHS NoExt _ body) = getSpan body
1168−layoutToBraces :: Layout -> R () -> R ()
304+getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1169−layoutToBraces = \case
1170− SingleLine -> useBraces
1173−-- | Append each element in both lists with semigroups. If one list is shorter
1174−-- than the other, return the rest of the longer list unchanged.
1175−liftAppend :: Semigroup a => [a] -> [a] -> [a]
1176−liftAppend [] [] = []
1177−liftAppend [] (y : ys) = y : ys
1178−liftAppend (x : xs) [] = x : xs
1179−liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
1181−getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1182−getGRHSSpan (GRHS NoExtField guards body) =
1183− combineSrcSpans' $ getLoc body :| map getLoc guards
1184−getGRHSSpan (XGRHS x) = noExtCon x
1186−-- | Place a thing that may have a hanging form. This function handles how
1187−-- to separate it from preceding expressions and whether to bump indentation
1188−-- depending on what sort of expression we have.
1189−placeHanging :: Placement -> R () -> R ()
1190−placeHanging placement m =
1199−-- | Check if given block contains single expression which has a hanging
1202− (body -> Placement) ->
1203− [LGRHS GhcPs (Located body)] ->
1205−blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
1206−blockPlacement _ _ = Normal
1208−-- | Check if given command has a hanging form.
1209−cmdPlacement :: HsCmd GhcPs -> Placement
1210−cmdPlacement = \case
1211− HsCmdLam NoExtField _ -> Hanging
1212− HsCmdCase NoExtField _ _ -> Hanging
1213− HsCmdDo NoExtField _ -> Hanging
1216−cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1217−cmdTopPlacement = \case
1218− HsCmdTop NoExtField (L _ x) -> cmdPlacement x
1219− XCmdTop x -> noExtCon x
1221−-- | Check if given expression has a hanging form.
1222−exprPlacement :: HsExpr GhcPs -> Placement
1223−exprPlacement = \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)) ->
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 "$" -> exprPlacement (unLoc y)
1238− HsApp NoExtField _ y -> exprPlacement (unLoc y)
1239− HsProc NoExtField p _ ->
1240− -- Indentation breaks if pattern is longer than one line and left
1241− -- hanging. Consequently, only apply hanging when it is safe.
1242− if isOneLineSpan (getLoc p)
1247−withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1248−withGuards = any (checkOne . unLoc)
1250− checkOne :: GRHS GhcPs (Located body) -> Bool
1251− checkOne (GRHS NoExtField [] _) = False
1254−exprOpTree :: LHsExpr GhcPs -> OpTree (LHsExpr GhcPs) (LHsExpr GhcPs)
1255−exprOpTree (L _ (OpApp NoExtField x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
1256−exprOpTree n = OpNode n
1258−getOpName :: HsExpr GhcPs -> Maybe RdrName
1260− HsVar NoExtField (L _ a) -> Just a
1263−getOpNameStr :: RdrName -> String
1264−getOpNameStr = occNameString . rdrNameOcc
1267− -- | Bracket style to use
1269− OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) ->
1271−p_exprOpTree s (OpNode x) = located x (p_hsExpr' s)
1272−p_exprOpTree s (OpBranch x op y) = do
1273− -- If the beginning of the first argument and the second argument are on
1274− -- the same line, and the second argument has a hanging form, use hanging
1278− (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1280− OpNode (L _ n) -> exprPlacement n
1283− -- Distinguish holes used in infix notation.
1284− -- eg. '1 _foo 2' and '1 `_foo` 2'
1285− opWrapper = case unLoc op of
1286− HsUnboundVar NoExtField _ -> backticks
1288− layout <- getLayout
1289− let ub = case layout of
1290− SingleLine -> useBraces
1291− MultiLine -> case placement of
1292− Hanging -> useBraces
1293− Normal -> dontUseBraces
1294− opNameStr = (fmap getOpNameStr . getOpName . unLoc) op
1295− gotDollar = opNameStr == Just "$"
1296− gotColon = opNameStr == Just ":"
1297− gotRecordDot = isRecordDot (unLoc op) (opTreeLoc y)
1299− switchLayout [opTreeLoc x] $
1301− p_op = located op (opWrapper . p_hsExpr)
1302− p_y = switchLayout [opTreeLoc y] (p_exprOpTree N y)
1303− isSection = case (opTreeLoc x, getLoc op) of
1304− (RealSrcSpan treeSpan, RealSrcSpan opSpan) ->
1305− srcSpanEndCol treeSpan /= srcSpanStartCol opSpan
1308− OpNode (L _ HsDo {}) -> True
1310− useRecordDot' <- useRecordDot
1322− inciIf (isDoBlock y) p_y
1324− && isOneLineSpan (opTreeLoc x)
1325− && placement == Normal -> do
1331− | useRecordDot' && gotRecordDot -> do
1333− when isSection space
1338− placeHanging placement $ do
1343−-- | Return 'True' if given expression is a record-dot operator expression.
1345− -- | Operator expression
1347− -- | Span of the expression on the right-hand side of the operator
1350−isRecordDot op (RealSrcSpan ySpan) = case op of
1351− HsVar NoExtField (L (RealSrcSpan opSpan) opName) ->
1352− (getOpNameStr opName == ".") && (srcSpanEndCol opSpan == srcSpanStartCol ySpan)
1354−isRecordDot _ _ = False
1356−-- | Get annotations for the enclosing element.
1357−getEnclosingAnns :: R [AnnKeywordId]
1358−getEnclosingAnns = do
1359− e <- getEnclosingSpan (const True)
1361− Nothing -> return []
1362− Just e' -> getAnns (RealSrcSpan e')