@@ -1,36 +1,43 @@
1−{-# LANGUAGE LambdaCase #-}
1+{-# LANGUAGE LambdaCase #-}
2+{-# LANGUAGE MultiWayIf #-}
2{-# LANGUAGE OverloadedStrings #-}
3{-# LANGUAGE OverloadedStrings #-}
3−{-# LANGUAGE RecordWildCards #-}
4+{-# LANGUAGE RecordWildCards #-}
5+{-# LANGUAGE TypeApplications #-}
5module Ormolu.Printer.Meat.Declaration.Value
7module Ormolu.Printer.Meat.Declaration.Value
6− ( p_valDecl
8+ ( p_valDecl,
8− , p_hsExpr
10+ p_hsExpr,
9− , p_hsSplice
11+ p_hsSplice,
13−import Ormolu.Printer.Internal
14import Bag (bagToList)
16import Bag (bagToList)
15import BasicTypes
17import BasicTypes
16import Control.Monad
18import Control.Monad
19+import Ctype (is_space)
17import Data.Bool (bool)
20import Data.Bool (bool)
18import Data.Char (isPunctuation, isSymbol)
21import Data.Char (isPunctuation, isSymbol)
19import Data.Data hiding (Infix, Prefix)
22import Data.Data hiding (Infix, Prefix)
23+import Data.Functor ((<&>))
20import Data.List (intersperse, sortOn)
24import Data.List (intersperse, sortOn)
25+import Data.List.NonEmpty (NonEmpty (..), (<|))
26+import qualified Data.List.NonEmpty as NE
21import Data.Text (Text)
27import Data.Text (Text)
28+import qualified Data.Text as Text
30+import OccName (occNameString)
23import Ormolu.Printer.Combinators
31import Ormolu.Printer.Combinators
32+import Ormolu.Printer.Internal
24import Ormolu.Printer.Meat.Common
33import Ormolu.Printer.Meat.Common
34+import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
25import Ormolu.Printer.Meat.Declaration.Signature
35import Ormolu.Printer.Meat.Declaration.Signature
26import Ormolu.Printer.Meat.Type
36import Ormolu.Printer.Meat.Type
37+import Ormolu.Printer.Operators
27import Ormolu.Utils
38import Ormolu.Utils
28−import Outputable (Outputable (..))
29−import RdrName (rdrNameOcc)
30−import SrcLoc (combineSrcSpans, isOneLineSpan)
31−import qualified Data.List.NonEmpty as NE
32−import {-# SOURCE #-} Ormolu.Printer.Meat.Declaration
40+-- | Style of a group of equations.
34data MatchGroupStyle
41data MatchGroupStyle
35 = Function (Located RdrName)
42 = Function (Located RdrName)
36 | PatternBind
43 | PatternBind
@@ -38,55 +45,62 @@ data MatchGroupStyle
39 | LambdaCase
46 | LambdaCase
48+-- | Style of equations in a group.
41data GroupStyle
49data GroupStyle
42 = EqualSign
50 = EqualSign
43 | RightArrow
51 | RightArrow
45-- | Expression placement. This marks the places where expressions that
53-- | Expression placement. This marks the places where expressions that
46-- implement handing forms may use them.
54-- implement handing forms may use them.
48data Placement
55data Placement
49− = Normal -- ^ Multi-line layout should cause
56+ = -- | Multi-line layout should cause
50− -- insertion of a newline and indentation
57+ -- insertion of a newline and indentation
52− | Hanging -- ^ Expressions that have hanging form
59+ Normal
53− -- should use it and avoid bumping one level
60+ | -- | Expressions that have hanging form
54− -- of indentation
61+ -- should use it and avoid bumping one level
56p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
66p_valDecl :: HsBindLR GhcPs GhcPs -> R ()
57p_valDecl = \case
67p_valDecl = \case
58− FunBind NoExt funId funMatches _ _ -> p_funBind funId funMatches
68+ FunBind NoExtField funId funMatches _ _ -> p_funBind funId funMatches
59− PatBind NoExt pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
69+ PatBind NoExtField pat grhss _ -> p_match PatternBind False NoSrcStrict [pat] grhss
60 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
70 VarBind {} -> notImplemented "VarBinds" -- introduced by the type checker
61 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
71 AbsBinds {} -> notImplemented "AbsBinds" -- introduced by the type checker
62− PatSynBind NoExt psb -> p_patSynBind psb
72+ PatSynBind NoExtField psb -> p_patSynBind psb
63− XHsBindsLR NoExt -> notImplemented "XHsBindsLR"
73+ XHsBindsLR x -> noExtCon x
65−p_funBind
75+p_funBind ::
66− :: Located RdrName
76+ Located RdrName ->
67− -> MatchGroup GhcPs (LHsExpr GhcPs)
77+ MatchGroup GhcPs (LHsExpr GhcPs) ->
69p_funBind name = p_matchGroup (Function name)
79p_funBind name = p_matchGroup (Function name)
71−p_matchGroup
81+p_matchGroup ::
72− :: MatchGroupStyle
82+ MatchGroupStyle ->
73− -> MatchGroup GhcPs (LHsExpr GhcPs)
83+ MatchGroup GhcPs (LHsExpr GhcPs) ->
75p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
85p_matchGroup = p_matchGroup' exprPlacement p_hsExpr
77−p_matchGroup'
87+p_matchGroup' ::
78− :: Data body
88+ Data body =>
79− => (body -> Placement)
89+ -- | How to get body placement
80− -> (body -> R ())
90+ (body -> Placement) ->
81− -> MatchGroupStyle
91+ -- | How to print body
82− -> MatchGroup GhcPs (Located body)
92+ (body -> R ()) ->
83− -> R ()
93+ -- | Style of this group of equations
84−p_matchGroup' placer pretty style MG {..} = do
94+ MatchGroupStyle ->
96+ MatchGroup GhcPs (Located body) ->
98+p_matchGroup' placer render style MG {..} = do
85 let ob = case style of
99 let ob = case style of
86 Case -> id
100 Case -> id
87 LambdaCase -> id
101 LambdaCase -> id
88 _ -> dontUseBraces
102 _ -> dontUseBraces
89− -- NOTE since we are forcing braces on 'sepSemi' based on 'ob', we have to
103+ -- Since we are forcing braces on 'sepSemi' based on 'ob', we have to
90 -- restore the brace state inside the sepsemi.
104 -- restore the brace state inside the sepsemi.
91 ub <- bool dontUseBraces useBraces <$> canUseBraces
105 ub <- bool dontUseBraces useBraces <$> canUseBraces
92 ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
106 ob $ sepSemi (located' (ub . p_Match)) (unLoc mg_alts)
@@ -94,14 +108,14 @@ p_matchGroup' placer pretty style MG {..} = do
94 p_Match m@Match {..} =
108 p_Match m@Match {..} =
98 (adjustMatchGroupStyle m style)
112 (adjustMatchGroupStyle m style)
99 (isInfixMatch m)
113 (isInfixMatch m)
100 (matchStrictness m)
114 (matchStrictness m)
103− p_Match _ = notImplemented "XMatch"
117+ p_Match (XMatch x) = noExtCon x
104−p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
118+p_matchGroup' _ _ _ (XMatchGroup x) = noExtCon x
106-- | Function id obtained through pattern matching on 'FunBind' should not
120-- | Function id obtained through pattern matching on 'FunBind' should not
107-- be used to print the actual equations because the different ‘RdrNames’
121-- be used to print the actual equations because the different ‘RdrNames’
@@ -109,11 +123,10 @@ p_matchGroup' _ _ _ (XMatchGroup NoExt) = notImplemented "XMatchGroup"
109-- and paretheses) associated with them. It is necessary to use per-equation
123-- and paretheses) associated with them. It is necessary to use per-equation
110-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
124-- names obtained from 'm_ctxt' of 'Match'. This function replaces function
111-- name inside of 'Function' accordingly.
125-- name inside of 'Function' accordingly.
112−
126+adjustMatchGroupStyle ::
113−adjustMatchGroupStyle
127+ Match GhcPs body ->
114− :: Match GhcPs body
128+ MatchGroupStyle ->
115− -> MatchGroupStyle
129+ MatchGroupStyle
117adjustMatchGroupStyle m = \case
130adjustMatchGroupStyle m = \case
118 Function _ -> (Function . mc_fun . m_ctxt) m
131 Function _ -> (Function . mc_fun . m_ctxt) m
119 style -> style
132 style -> style
@@ -121,31 +134,43 @@ adjustMatchGroupStyle m = \case
121matchStrictness :: Match id body -> SrcStrictness
134matchStrictness :: Match id body -> SrcStrictness
122matchStrictness match =
135matchStrictness match =
123 case m_ctxt match of
136 case m_ctxt match of
124− FunRhs{mc_strictness=s} -> s
137+ FunRhs {mc_strictness = s} -> s
125 _ -> NoSrcStrict
138 _ -> NoSrcStrict
127−p_match
140+p_match ::
128− :: MatchGroupStyle
141+ -- | Style of the group
129− -> Bool -- ^ Is this an infix match?
142+ MatchGroupStyle ->
130− -> SrcStrictness -- ^ Strictness prefix (FunBind)
143+ -- | Is this an infix match?
131− -> [LPat GhcPs]
144+ Bool ->
132− -> GRHSs GhcPs (LHsExpr GhcPs)
145+ -- | Strictness prefix (FunBind)
133− -> R ()
146+ SrcStrictness ->
147+ -- | Argument patterns
150+ GRHSs GhcPs (LHsExpr GhcPs) ->
134p_match = p_match' exprPlacement p_hsExpr
152p_match = p_match' exprPlacement p_hsExpr
136−p_match'
154+p_match' ::
137− :: Data body
155+ Data body =>
138− => (body -> Placement)
156+ -- | How to get body placement
139− -> (body -> R ())
157+ (body -> Placement) ->
140− -> MatchGroupStyle
158+ -- | How to print body
141− -> Bool -- ^ Is this an infix match?
159+ (body -> R ()) ->
142− -> SrcStrictness -- ^ Strictness prefix (FunBind)
160+ -- | Style of this group of equations
143− -> [LPat GhcPs]
161+ MatchGroupStyle ->
144− -> GRHSs GhcPs (Located body)
162+ -- | Is this an infix match?
146−p_match' placer pretty style isInfix strictness m_pats m_grhss = do
164+ -- | Strictness prefix (FunBind)
147− -- NOTE Normally, since patterns may be placed in a multi-line layout, it
165+ SrcStrictness ->
148− -- is necessary to bump indentation for the pattern group so it's more
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
149 -- indented than function name. This in turn means that indentation for
174 -- indented than function name. This in turn means that indentation for
150 -- the body should also be bumped. Normally this would mean that bodies
175 -- the body should also be bumped. Normally this would mean that bodies
151 -- would start with two indentation steps applied, which is ugly, so we
176 -- would start with two indentation steps applied, which is ugly, so we
@@ -155,23 +180,24 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
155 NoSrcStrict -> return ()
180 NoSrcStrict -> return ()
156 SrcStrict -> txt "!"
181 SrcStrict -> txt "!"
157 SrcLazy -> txt "~"
182 SrcLazy -> txt "~"
158− inci' <- case NE.nonEmpty m_pats of
183+ indentBody <- case NE.nonEmpty m_pats of
159− Nothing -> id <$ case style of
184+ Nothing ->
160− Function name -> p_rdrName name
185+ False <$ case style of
161− _ -> return ()
186+ Function name -> p_rdrName name
162 Just ne_pats -> do
188 Just ne_pats -> do
163− let combinedSpans = combineSrcSpans' $
189+ let combinedSpans = case style of
164− getLoc <$> ne_pats
190+ Function name -> combineSrcSpans (getLoc name) patSpans
165− inci' = if isOneLineSpan combinedSpans
191+ _ -> patSpans
166− then id
192+ patSpans = combineSrcSpans' (getLoc <$> ne_pats)
167− else inci
193+ indentBody = not (isOneLineSpan combinedSpans)
168 switchLayout [combinedSpans] $ do
194 switchLayout [combinedSpans] $ do
169 let stdCase = sep breakpoint (located' p_pat) m_pats
195 let stdCase = sep breakpoint (located' p_pat) m_pats
170 case style of
196 case style of
171 Function name ->
197 Function name ->
172 p_infixDefHelper
198 p_infixDefHelper
174− inci'
200+ indentBody
175 (p_rdrName name)
201 (p_rdrName name)
176 (located' p_pat <$> m_pats)
202 (located' p_pat <$> m_pats)
177 PatternBind -> stdCase
203 PatternBind -> stdCase
@@ -182,49 +208,44 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
182 BangPat _ _ -> True
208 BangPat _ _ -> True
183 SplicePat _ _ -> True
209 SplicePat _ _ -> True
184 _ -> False
210 _ -> False
185− txt (if needsSpace then "\\ " else "\\")
211+ txt "\\"
186− stdCase
212+ when needsSpace space
187 LambdaCase -> stdCase
214 LambdaCase -> stdCase
188− return inci'
215+ return indentBody
189− let
216+ let -- Calculate position of end of patterns. This is useful when we decide
190− -- Calculate position of end of patterns. This is useful when we decide
217+ -- about putting certain constructions in hanging positions.
191− -- about putting certain constructions in hanging positions.
218+ endOfPats = case NE.nonEmpty m_pats of
192− endOfPats = case NE.nonEmpty m_pats of
219+ Nothing -> case style of
193− Nothing -> case style of
220+ Function name -> Just (getLoc name)
194− Function name -> (Just . srcSpanEnd . getLoc) name
221+ _ -> Nothing
195− _ -> Nothing
222+ Just pats -> (Just . getLoc . NE.last) pats
196− Just pats -> (Just . srcSpanEnd . getLoc . NE.last) pats
223+ isCase = \case
197− isCase = \case
224+ Case -> True
198− Case -> True
225+ LambdaCase -> True
199− LambdaCase -> True
226+ _ -> False
201− let GRHSs {..} = m_grhss
202 hasGuards = withGuards grhssGRHSs
227 hasGuards = withGuards grhssGRHSs
203− unless (length grhssGRHSs > 1) $ do
228+ grhssSpan =
204− case style of
229+ combineSrcSpans' $
205− Function _ | hasGuards -> return ()
230+ getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
206− Function _ -> txt " ="
231+ patGrhssSpan =
207− PatternBind -> txt " ="
232+ maybe
208− s | isCase s && hasGuards -> return ()
233+ grhssSpan
209− _ -> txt " ->"
234+ (combineSrcSpans grhssSpan . srcLocSpan . srcSpanEnd)
210− let grhssSpan = combineSrcSpans' $
235+ endOfPats
211− getGRHSSpan . unLoc <$> NE.fromList grhssGRHSs
212− patGrhssSpan = maybe grhssSpan
213− (combineSrcSpans grhssSpan . srcLocSpan) endOfPats
214 placement =
236 placement =
215 case endOfPats of
237 case endOfPats of
216 Nothing -> blockPlacement placer grhssGRHSs
238 Nothing -> blockPlacement placer grhssGRHSs
217 Just spn ->
239 Just spn ->
218− if isOneLineSpan
240+ if onTheSameLine spn grhssSpan
219− (mkSrcSpan spn (srcSpanStart grhssSpan))
220 then blockPlacement placer grhssGRHSs
241 then blockPlacement placer grhssGRHSs
221 else Normal
242 else Normal
222 p_body = do
243 p_body = do
223 let groupStyle =
244 let groupStyle =
224 if isCase style && hasGuards
245 if isCase style && hasGuards
225− then RightArrow
246+ then RightArrow
226− else EqualSign
247+ else EqualSign
227− sep newline (located' (p_grhs' pretty groupStyle)) grhssGRHSs
248+ sep newline (located' (p_grhs' placer render groupStyle)) grhssGRHSs
228 p_where = do
249 p_where = do
229 let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
250 let whereIsEmpty = GHC.isEmptyLocalBindsPR (unLoc grhssLocalBinds)
230 unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
251 unless (GHC.eqEmptyLocalBinds (unLoc grhssLocalBinds)) $ do
@@ -232,166 +253,211 @@ p_match' placer pretty style isInfix strictness m_pats m_grhss = do
232 txt "where"
253 txt "where"
233 unless whereIsEmpty breakpoint
254 unless whereIsEmpty breakpoint
234 inci $ located grhssLocalBinds p_hsLocalBinds
255 inci $ located grhssLocalBinds p_hsLocalBinds
235− inci' $ do
256+ inciIf indentBody $ do
257+ unless (length grhssGRHSs > 1) $
259+ Function _ | hasGuards -> return ()
260+ Function _ -> space >> inci equals
261+ PatternBind -> space >> inci equals
262+ s | isCase s && hasGuards -> return ()
263+ _ -> space >> txt "->"
236 switchLayout [patGrhssSpan] $
264 switchLayout [patGrhssSpan] $
237 placeHanging placement p_body
265 placeHanging placement p_body
238 inci p_where
266 inci p_where
267+p_match' _ _ _ _ _ _ (XGRHSs x) = noExtCon x
240p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
269p_grhs :: GroupStyle -> GRHS GhcPs (LHsExpr GhcPs) -> R ()
241−p_grhs = p_grhs' p_hsExpr
270+p_grhs = p_grhs' exprPlacement p_hsExpr
243−p_grhs'
272+p_grhs' ::
244− :: Data body
273+ Data body =>
245− => (body -> R ())
274+ -- | How to get body placement
246− -> GroupStyle
275+ (body -> Placement) ->
247− -> GRHS GhcPs (Located body)
276+ -- | How to print body
248− -> R ()
277+ (body -> R ()) ->
249−p_grhs' pretty style (GRHS NoExt guards body) =
278+ GroupStyle ->
279+ GRHS GhcPs (Located body) ->
281+p_grhs' placer render style (GRHS NoExtField guards body) =
250 case guards of
282 case guards of
251 [] -> p_body
283 [] -> p_body
253− txt "| "
285+ txt "|"
254− sitcc (sep (comma >> breakpoint) (sitcc . located' p_stmt) xs)
256− txt $ case style of
287+ sitcc (sep commaDel (sitcc . located' p_stmt) xs)
257− EqualSign -> "="
288+ space
258− RightArrow -> "->"
289+ inci $ case style of
259− breakpoint
290+ EqualSign -> equals
260− inci p_body
291+ RightArrow -> txt "->"
292+ placeHanging placement p_body
262− p_body = located body pretty
294+ placement =
263−p_grhs' _ _ (XGRHS NoExt) = notImplemented "XGRHS"
295+ case endOfGuards of
296+ Nothing -> placer (unLoc body)
298+ if onTheSameLine spn (getLoc body)
299+ then placer (unLoc body)
302+ case NE.nonEmpty guards of
304+ Just gs -> (Just . getLoc . NE.last) gs
305+ p_body = located body render
306+p_grhs' _ _ _ (XGRHS x) = noExtCon x
265p_hsCmd :: HsCmd GhcPs -> R ()
308p_hsCmd :: HsCmd GhcPs -> R ()
266p_hsCmd = \case
309p_hsCmd = \case
267− HsCmdArrApp NoExt body input arrType _ -> do
310+ HsCmdArrApp NoExtField body input arrType _ -> do
268 located body p_hsExpr
311 located body p_hsExpr
269− txt $ case arrType of
312+ breakpoint
270− HsFirstOrderApp -> " -<"
313+ inci $ do
271− HsHigherOrderApp -> " -<<"
314+ case arrType of
272− placeHanging (exprPlacement (unLoc input)) $
315+ HsFirstOrderApp -> txt "-<"
273− located input p_hsExpr
316+ HsHigherOrderApp -> txt "-<<"
274− HsCmdArrForm NoExt form Prefix _ cmds -> banana $ sitcc $ do
317+ placeHanging (exprPlacement (unLoc input)) $
318+ located input p_hsExpr
319+ HsCmdArrForm NoExtField form Prefix _ cmds -> banana $ do
275 located form p_hsExpr
320 located form p_hsExpr
276 unless (null cmds) $ do
321 unless (null cmds) $ do
277 breakpoint
322 breakpoint
278 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
323 inci (sequence_ (intersperse breakpoint (located' p_hsCmdTop <$> cmds)))
279− HsCmdArrForm NoExt form Infix _ [left, right] -> do
324+ HsCmdArrForm NoExtField form Infix _ [left, right] -> do
280 located left p_hsCmdTop
325 located left p_hsCmdTop
282 located form p_hsExpr
327 located form p_hsExpr
283 placeHanging (cmdTopPlacement (unLoc right)) $
328 placeHanging (cmdTopPlacement (unLoc right)) $
284 located right p_hsCmdTop
329 located right p_hsCmdTop
285− HsCmdArrForm NoExt _ Infix _ _ -> notImplemented "HsCmdArrForm"
330+ HsCmdArrForm NoExtField _ Infix _ _ -> notImplemented "HsCmdArrForm"
286 HsCmdApp {} ->
331 HsCmdApp {} ->
287 -- XXX Does this ever occur in the syntax tree? It does not seem like it
332 -- XXX Does this ever occur in the syntax tree? It does not seem like it
288 -- does. Open an issue and ping @yumiova if this ever occurs in output.
333 -- does. Open an issue and ping @yumiova if this ever occurs in output.
289 notImplemented "HsCmdApp"
334 notImplemented "HsCmdApp"
290− HsCmdLam NoExt mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
335+ HsCmdLam NoExtField mgroup -> p_matchGroup' cmdPlacement p_hsCmd Lambda mgroup
291− HsCmdPar NoExt c -> parens (located c p_hsCmd)
336+ HsCmdPar NoExtField c -> parens N (located c p_hsCmd)
292− HsCmdCase NoExt e mgroup -> do
337+ HsCmdCase NoExtField e mgroup ->
293− txt "case "
338+ p_case cmdPlacement p_hsCmd e mgroup
294− located e p_hsExpr
339+ HsCmdIf NoExtField _ if' then' else' ->
295− txt " of"
340+ p_if cmdPlacement p_hsCmd if' then' else'
296− breakpoint
341+ HsCmdLet NoExtField localBinds c ->
297− inci (p_matchGroup' cmdPlacement p_hsCmd Case mgroup)
342+ p_let p_hsCmd localBinds c
298− HsCmdIf NoExt _ if' then' else' -> do
343+ HsCmdDo NoExtField es -> do
300− located if' p_hsExpr
303− located then' $ \x -> do
308− located else' $ \x -> do
311− HsCmdLet NoExt localBinds c -> do
313− sitcc (located localBinds p_hsLocalBinds)
316− sitcc (located c p_hsCmd)
317− HsCmdDo NoExt es -> do
320− inci (located es (sitcc . sep newline (located' (sitcc . p_stmt' p_hsCmd))))
346+ inci . located es $
347+ sitcc . sep newline (sitcc . withSpacing (p_stmt' cmdPlacement p_hsCmd))
321 HsCmdWrap {} -> notImplemented "HsCmdWrap"
348 HsCmdWrap {} -> notImplemented "HsCmdWrap"
322− XCmd {} -> notImplemented "XCmd"
349+ XCmd x -> noExtCon x
324p_hsCmdTop :: HsCmdTop GhcPs -> R ()
351p_hsCmdTop :: HsCmdTop GhcPs -> R ()
325p_hsCmdTop = \case
352p_hsCmdTop = \case
326− HsCmdTop NoExt cmd -> located cmd p_hsCmd
353+ HsCmdTop NoExtField cmd -> located cmd p_hsCmd
327− XCmdTop {} -> notImplemented "XHsCmdTop"
354+ XCmdTop x -> noExtCon x
356+-- | Render an expression preserving blank lines between such consecutive
357+-- expressions found in the original source code.
359+ -- | Rendering function
361+ -- | Entity to render
364+withSpacing f l = located l $ \x -> do
366+ UnhelpfulSpan _ -> f x
367+ RealSrcSpan currentSpn -> do
368+ getSpanMark >>= \case
369+ -- Spacing before comments will be handled by the code
370+ -- that prints comments, so we just have to deal with
371+ -- blank lines between statements here.
372+ Just (StatementSpan lastSpn) ->
373+ if srcSpanStartLine currentSpn > srcSpanEndLine lastSpn + 1
378+ -- In some cases the (f x) expression may insert a new mark. We want
379+ -- to be careful not to override comment marks.
380+ getSpanMark >>= \case
381+ Just (HaddockSpan _ _) -> return ()
382+ Just (CommentSpan _) -> return ()
383+ _ -> setSpanMark (StatementSpan currentSpn)
329p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
385p_stmt :: Stmt GhcPs (LHsExpr GhcPs) -> R ()
330−p_stmt = p_stmt' p_hsExpr
386+p_stmt = p_stmt' exprPlacement p_hsExpr
332−p_stmt'
388+p_stmt' ::
333− :: Data body
389+ Data body =>
334− => (body -> R ())
390+ -- | Placer
335− -> Stmt GhcPs (Located body)
391+ (body -> Placement) ->
336− -> R ()
392+ -- | Render
337−p_stmt' pretty = \case
393+ (body -> R ()) ->
338− LastStmt NoExt body _ _ -> located body pretty
394+ -- | Statement to render
339− BindStmt NoExt l f _ _ -> do
395+ Stmt GhcPs (Located body) ->
340− located l p_pat
396+ R ()
397+p_stmt' placer render = \case
398+ LastStmt NoExtField body _ _ -> located body render
399+ BindStmt NoExtField p f _ _ -> do
343− breakpoint
403+ let loc = getLoc p
344− inci (located f pretty)
404+ placement =
408+ (mkSrcSpan (srcSpanEnd loc) (srcSpanStart l'))
411+ switchLayout [loc, getLoc f] $
412+ placeHanging placement (located f render)
345 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
413 ApplicativeStmt {} -> notImplemented "ApplicativeStmt" -- generated by renamer
346− BodyStmt NoExt body _ _ -> located body pretty
414+ BodyStmt NoExtField body _ _ -> located body render
347− LetStmt NoExt binds -> do
415+ LetStmt NoExtField binds -> do
348− txt "let "
416+ txt "let"
349 sitcc $ located binds p_hsLocalBinds
418 sitcc $ located binds p_hsLocalBinds
350 ParStmt {} ->
419 ParStmt {} ->
351− -- NOTE 'ParStmt' should always be eliminated in 'gatherStmt' already,
420+ -- 'ParStmt' should always be eliminated in 'gatherStmt' already, such
352− -- such that it never occurs in 'p_stmt''. Consequently, handling it
421+ -- that it never occurs in 'p_stmt''. Consequently, handling it here
353− -- here would be redundant.
422+ -- would be redundant.
354 notImplemented "ParStmt"
423 notImplemented "ParStmt"
355− TransStmt {..} -> do
424+ TransStmt {..} ->
356− -- NOTE 'TransStmt' only needs to account for pretty printing itself,
425+ -- 'TransStmt' only needs to account for render printing itself, since
357− -- since pretty printing of relevant statements (e.g., in 'trS_stmts')
426+ -- pretty printing of relevant statements (e.g., in 'trS_stmts') is
358− -- is handled through 'gatherStmt'.
427+ -- handled through 'gatherStmt'.
359 case (trS_form, trS_by) of
428 case (trS_form, trS_by) of
360− (ThenForm, Nothing) -> located trS_using $ \x -> do
429+ (ThenForm, Nothing) -> do
361 txt "then"
430 txt "then"
362 breakpoint
431 breakpoint
363− inci (p_hsExpr x)
432+ inci $ located trS_using p_hsExpr
364 (ThenForm, Just e) -> do
433 (ThenForm, Just e) -> do
365− located trS_using $ \x -> do
434+ txt "then"
369 breakpoint
435 breakpoint
370− located e $ \x -> do
436+ inci $ located trS_using p_hsExpr
371− txt "by"
437+ breakpoint
372− breakpoint
438+ txt "by"
373− inci (p_hsExpr x)
439+ breakpoint
374− (GroupForm, Nothing) -> located trS_using $ \x -> do
440+ inci $ located e p_hsExpr
441+ (GroupForm, Nothing) -> do
375 txt "then group using"
442 txt "then group using"
376 breakpoint
443 breakpoint
377− inci (p_hsExpr x)
444+ inci $ located trS_using p_hsExpr
378 (GroupForm, Just e) -> do
445 (GroupForm, Just e) -> do
379− located e $ \x -> do
446+ txt "then group by"
383 breakpoint
447 breakpoint
384− located trS_using $ \x -> do
448+ inci $ located e p_hsExpr
385− txt "using"
449+ breakpoint
386− breakpoint
450+ txt "using"
387− inci (p_hsExpr x)
451+ breakpoint
452+ inci $ located trS_using p_hsExpr
388 RecStmt {..} -> do
453 RecStmt {..} -> do
389− txt "rec "
454+ txt "rec"
390− sitcc $ sepSemi (located' (p_stmt' pretty)) recS_stmts
455+ space
391− XStmtLR {} -> notImplemented "XStmtLR"
456+ sitcc $ sepSemi (withSpacing (p_stmt' placer render)) recS_stmts
457+ XStmtLR c -> noExtCon c
393gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
459gatherStmt :: ExprLStmt GhcPs -> [[ExprLStmt GhcPs]]
394−gatherStmt (L _ (ParStmt NoExt block _ _)) =
460+gatherStmt (L _ (ParStmt NoExtField block _ _)) =
395 foldr ((<>) . gatherStmtBlock) [] block
461 foldr ((<>) . gatherStmtBlock) [] block
396gatherStmt (L s stmt@TransStmt {..}) =
462gatherStmt (L s stmt@TransStmt {..}) =
397 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
463 foldr liftAppend [] ((gatherStmt <$> trS_stmts) <> pure [[L s stmt]])
@@ -400,254 +466,337 @@ gatherStmt stmt = [[stmt]]
400gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
466gatherStmtBlock :: ParStmtBlock GhcPs GhcPs -> [[ExprLStmt GhcPs]]
401gatherStmtBlock (ParStmtBlock _ stmts _ _) =
467gatherStmtBlock (ParStmtBlock _ stmts _ _) =
402 foldr (liftAppend . gatherStmt) [] stmts
468 foldr (liftAppend . gatherStmt) [] stmts
403−gatherStmtBlock XParStmtBlock {} = notImplemented "XParStmtBlock"
469+gatherStmtBlock (XParStmtBlock x) = noExtCon x
405p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
471p_hsLocalBinds :: HsLocalBindsLR GhcPs GhcPs -> R ()
406p_hsLocalBinds = \case
472p_hsLocalBinds = \case
407− HsValBinds NoExt (ValBinds NoExt bag lsigs) -> do
473+ HsValBinds NoExtField (ValBinds NoExtField bag lsigs) -> do
408− let ssStart = either
474+ -- When in a single-line layout, there is a chance that the inner
409− (srcSpanStart . getLoc)
475+ -- elements will also contain semicolons and they will confuse the
410− (srcSpanStart . getLoc)
476+ -- parser. so we request braces around every element except the last.
411− items =
477+ br <- layoutToBraces <$> getLayout
412− (Left <$> bagToList bag) ++ (Right <$> lsigs)
478+ let items =
413− p_item (Left x) = located x p_valDecl
479+ let injectLeft (L l x) = L l (Left x)
414− p_item (Right x) = located x p_sigDecl
480+ injectRight (L l x) = L l (Right x)
415− sitcc $ sepSemi (useBraces . p_item) (sortOn ssStart items)
481+ in (injectLeft <$> bagToList bag) ++ (injectRight <$> lsigs)
416− HsValBinds NoExt _ -> notImplemented "HsValBinds"
482+ positionToBracing = \case
417− HsIPBinds NoExt (IPBinds NoExt xs) ->
483+ SinglePos -> id
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) ->
418 -- Second argument of IPBind is always Left before type-checking.
494 -- Second argument of IPBind is always Left before type-checking.
419− let p_ipBind (IPBind NoExt (Left name) expr) = do
495+ let p_ipBind (IPBind NoExtField (Left name) expr) = do
420 atom name
496 atom name
422 breakpoint
499 breakpoint
423− dontUseBraces $ inci $ located expr p_hsExpr
500+ useBraces $ inci $ located expr p_hsExpr
424− p_ipBind _ = notImplemented "XHsIPBinds"
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
425 in sepSemi (located' p_ipBind) xs
505 in sepSemi (located' p_ipBind) xs
426− HsIPBinds NoExt _ -> notImplemented "HsIpBinds"
506+ HsIPBinds NoExtField _ -> notImplemented "HsIpBinds"
427− EmptyLocalBinds NoExt -> return ()
507+ EmptyLocalBinds NoExtField -> return ()
428− XHsLocalBindsLR _ -> notImplemented "XHsLocalBindsLR"
508+ XHsLocalBindsLR x -> noExtCon x
431− :: (Data id, Outputable id)
432− => HsRecField' id (LHsExpr GhcPs)
434−p_hsRecField = \HsRecField {..} -> do
435− located hsRecFieldLbl atom
436− unless hsRecPun $ do
438− let placement = exprPlacement (unLoc hsRecFieldArg)
439− placeHanging placement $ located hsRecFieldArg p_hsExpr
441−p_hsTupArg :: HsTupArg GhcPs -> R ()
510+p_hsRecField ::
442−p_hsTupArg = \case
511+ HsRecField' RdrName (LHsExpr GhcPs) ->
443− Present NoExt x -> located x p_hsExpr
512+ R ()
444− Missing NoExt -> pure ()
513+p_hsRecField HsRecField {..} = do
445− XTupArg {} -> notImplemented "XTupArg"
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)
447p_hsExpr :: HsExpr GhcPs -> R ()
524p_hsExpr :: HsExpr GhcPs -> R ()
448−p_hsExpr = \case
525+p_hsExpr = p_hsExpr' N
449− HsVar NoExt name -> p_rdrName name
526+
450− HsUnboundVar NoExt _ -> notImplemented "HsUnboundVar"
527+p_hsExpr' :: BracketStyle -> HsExpr GhcPs -> R ()
451− HsConLikeOut NoExt _ -> notImplemented "HsConLikeOut"
528+p_hsExpr' s = \case
452− HsRecFld NoExt x ->
529+ HsVar NoExtField name -> p_rdrName name
530+ HsUnboundVar NoExtField v -> atom (unboundVarOcc v)
531+ HsConLikeOut NoExtField _ -> notImplemented "HsConLikeOut"
532+ HsRecFld NoExtField x ->
453 case x of
533 case x of
454− Unambiguous NoExt name -> p_rdrName name
534+ Unambiguous NoExtField name -> p_rdrName name
455− Ambiguous NoExt name -> p_rdrName name
535+ Ambiguous NoExtField name -> p_rdrName name
456− XAmbiguousFieldOcc NoExt -> notImplemented "XAmbiguousFieldOcc"
536+ XAmbiguousFieldOcc xx -> noExtCon xx
457− HsOverLabel NoExt _ v -> do
537+ HsOverLabel NoExtField _ v -> do
460− HsIPVar NoExt (HsIPName name) -> do
540+ HsIPVar NoExtField (HsIPName name) -> do
462 atom name
542 atom name
463− HsOverLit NoExt v -> atom (ol_val v)
543+ HsOverLit NoExtField v -> atom (ol_val v)
464− HsLit NoExt lit -> atom lit
544+ HsLit NoExtField lit ->
465− HsLam NoExt mgroup ->
545+ case lit of
546+ HsString (SourceText stxt) _ -> p_stringLit stxt
547+ HsStringPrim (SourceText stxt) _ -> p_stringLit stxt
549+ HsLam NoExtField mgroup ->
466 p_matchGroup Lambda mgroup
550 p_matchGroup Lambda mgroup
467− HsLamCase NoExt mgroup -> do
551+ HsLamCase NoExtField mgroup -> do
468 txt "\\case"
552 txt "\\case"
470− inci (p_matchGroup LambdaCase mgroup)
471− HsApp NoExt f x -> sitcc $ do
473 breakpoint
553 breakpoint
474− inci (located x p_hsExpr)
554+ inci (p_matchGroup LambdaCase mgroup)
475− HsAppType a e -> do
555+ HsApp NoExtField f x -> do
556+ let -- In order to format function applications with multiple parameters
557+ -- nicer, traverse the AST to gather the function and all the
558+ -- parameters together.
559+ gatherArgs f' knownArgs =
561+ L _ (HsApp _ l r) -> gatherArgs l (r <| knownArgs)
562+ _ -> (f', knownArgs)
563+ (func, args) = gatherArgs f (x :| [])
564+ -- We need to handle the last argument specially if it is a
565+ -- hanging construct, so separate it from the rest.
566+ (initp, lastp) = (NE.init args, NE.last args)
569+ getLoc f :| [(srcLocSpan . srcSpanStart . getLoc) lastp]
570+ -- Hang the last argument only if the initial arguments span one
573+ if isOneLineSpan initSpan
574+ then exprPlacement (unLoc lastp)
576+ -- If the last argument is not hanging, just separate every argument as
577+ -- usual. If it is hanging, print the initial arguments and hang the
578+ -- last one. Also, use braces around the every argument except the last
582+ let -- Usually we want to bump indentation for arguments for the
583+ -- sake of readability. However, when the function itself is a
584+ -- do-block or case expression it is not a good idea. It seems
585+ -- to be safe to always bump indentation when the function
586+ -- expression is parenthesised.
589+ L _ (HsPar NoExtField _) -> True
590+ L _ (HsAppType NoExtField _ _) -> True
591+ L _ (HsMultiIf NoExtField _) -> True
592+ L spn _ -> isOneLineSpan spn
595+ SingleLine -> useBraces
598+ located func (p_hsExpr' s)
600+ inciIf doIndent $ sep breakpoint (located' p_hsExpr) initp
601+ inciIf doIndent $ do
602+ unless (null initp) breakpoint
603+ located lastp p_hsExpr
605+ useBraces . switchLayout [initSpan] $ do
606+ located func (p_hsExpr' s)
608+ sep breakpoint (located' p_hsExpr) initp
609+ placeHanging placement $
610+ located lastp p_hsExpr
611+ HsAppType NoExtField e a -> do
476 located e p_hsExpr
612 located e p_hsExpr
477 breakpoint
613 breakpoint
478 inci $ do
614 inci $ do
616+ -- Insert a space when the type is represented as a TH splice to avoid
617+ -- gluing @ and $ together.
618+ case unLoc (hswc_body a) of
619+ HsSpliceTy {} -> space
480 located (hswc_body a) p_hsType
621 located (hswc_body a) p_hsType
481− OpApp NoExt x op y -> do
622+ OpApp NoExtField x op y -> do
482− -- NOTE If the beginning of the first argument and the second argument
623+ let opTree = OpBranch (exprOpTree x) op (exprOpTree y)
483− -- are on the same line, and the second argument has a hanging form, use
624+ p_exprOpTree s (reassociateOpTree getOpName opTree)
484− -- hanging placement.
625+ NegApp NoExtField e _ -> do
485− let placement =
626+ txt "-"
486− if isOneLineSpan
627+ space
487− (mkSrcSpan (srcSpanStart (getLoc x)) (srcSpanStart (getLoc y)))
488− then exprPlacement (unLoc y)
490− opWrapper = case unLoc op of
491− EWildPat NoExt -> backticks
495− (return $ case placement of
496− Hanging -> useBraces
497− Normal -> dontUseBraces)
498− ub $ located x p_hsExpr
499− placeHanging placement $ do
500− located op (opWrapper . p_hsExpr)
503− NegApp NoExt e _ -> do
505 located e p_hsExpr
628 located e p_hsExpr
506− HsPar NoExt e -> parens (located e p_hsExpr)
629+ HsPar NoExtField e ->
507− SectionL NoExt x op -> do
630+ parens s (located e (dontUseBraces . p_hsExpr))
631+ SectionL NoExtField x op -> do
508 located x p_hsExpr
632 located x p_hsExpr
509 breakpoint
633 breakpoint
510 inci (located op p_hsExpr)
634 inci (located op p_hsExpr)
511− SectionR NoExt op x -> do
635+ SectionR NoExtField op x -> do
512 located op p_hsExpr
636 located op p_hsExpr
513− breakpoint
637+ useRecordDot' <- useRecordDot
638+ let isRecordDot' = isRecordDot (unLoc op) (getLoc x)
639+ unless (useRecordDot' && isRecordDot') breakpoint
514 inci (located x p_hsExpr)
640 inci (located x p_hsExpr)
515− ExplicitTuple NoExt args boxity -> do
641+ ExplicitTuple NoExtField args boxity ->
516 let isSection = any (isMissing . unLoc) args
642 let isSection = any (isMissing . unLoc) args
517 isMissing = \case
643 isMissing = \case
518− Missing NoExt -> True
644+ Missing NoExtField -> True
519 _ -> False
645 _ -> False
520− let parens' =
646+ p_arg = \case
647+ Present NoExtField x -> located x p_hsExpr
648+ Missing NoExtField -> pure ()
649+ XTupArg x -> noExtCon x
650+ p_larg = sitcc . located' p_arg
521 case boxity of
652 case boxity of
522 Boxed -> parens
653 Boxed -> parens
523 Unboxed -> parensHash
654 Unboxed -> parensHash
524− if isSection
655+ in if isSection
525− then switchLayout [] . parens' $
656+ then
526− sep comma (located' p_hsTupArg) args
657+ switchLayout [] . parens' s $
527− else switchLayout (getLoc <$> args) . parens' . sitcc $
658+ sep comma p_larg args
528− sep (comma >> breakpoint) (sitcc . located' p_hsTupArg) args
659+ else
529− ExplicitSum NoExt tag arity e ->
660+ switchLayout (getLoc <$> args) . parens' s $
530− p_unboxedSum tag arity (located e p_hsExpr)
661+ sep commaDel p_larg args
531− HsCase NoExt e mgroup -> do
662+ ExplicitSum NoExtField tag arity e ->
532− txt "case "
663+ p_unboxedSum N tag arity (located e p_hsExpr)
533− located e p_hsExpr
664+ HsCase NoExtField e mgroup ->
534− txt " of"
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
535 breakpoint
670 breakpoint
536− inci (p_matchGroup Case mgroup)
671+ inci . inci $ sep newline (located' (p_grhs RightArrow)) guards
537− HsIf NoExt _ if' then' else' -> do
672+ HsLet NoExtField localBinds e ->
538− txt "if "
673+ p_let p_hsExpr localBinds e
539− located if' p_hsExpr
674+ HsDo NoExtField ctx es -> do
542− located then' $ \x -> do
547− located else' $ \x -> do
550− HsMultiIf NoExt guards -> do
552− sitcc $ sep newline (located' (p_grhs RightArrow)) guards
553− HsLet NoExt localBinds e -> do
555− sitcc (located localBinds p_hsLocalBinds)
556− vlayout space (newline >> space)
558− sitcc (located e p_hsExpr)
559− HsDo NoExt ctx es -> do
560 let doBody header = do
675 let doBody header = do
561 txt header
676 txt header
562 breakpoint
677 breakpoint
563− ub <- vlayout (return useBraces) (return id)
678+ ub <- layoutToBraces <$> getLayout
564− inci $ sepSemi (located' (ub . p_stmt)) (unLoc es)
679+ inci $
565− compBody = brackets $ located es $ \xs -> do
680+ sepSemi
566− let p_parBody = sep
681+ (ub . withSpacing (p_stmt' exprPlacement (p_hsExpr' S)))
567− (breakpoint >> txt "| ")
682+ (unLoc es)
568− p_seqBody
683+ compBody = brackets N . located es $ \xs -> do
569− p_seqBody = sitcc . sep
684+ let p_parBody =
570− (comma >> breakpoint)
685+ sep
571− (located' (sitcc . p_stmt))
686+ (breakpoint >> txt "|" >> space)
692+ (located' (sitcc . p_stmt))
572 stmts = init xs
693 stmts = init xs
573 yield = last xs
694 yield = last xs
574 lists = foldr (liftAppend . gatherStmt) [] stmts
695 lists = foldr (liftAppend . gatherStmt) [] stmts
575 located yield p_stmt
696 located yield p_stmt
576 breakpoint
697 breakpoint
577− txt "| "
698+ txt "|"
578 p_parBody lists
700 p_parBody lists
579 case ctx of
701 case ctx of
580 DoExpr -> doBody "do"
702 DoExpr -> doBody "do"
581 MDoExpr -> doBody "mdo"
703 MDoExpr -> doBody "mdo"
582 ListComp -> compBody
704 ListComp -> compBody
583 MonadComp -> notImplemented "MonadComp"
705 MonadComp -> notImplemented "MonadComp"
584− ArrowExpr -> notImplemented "ArrowExpr"
706+ ArrowExpr -> notImplemented "ArrowExpr"
585 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
707 GhciStmtCtxt -> notImplemented "GhciStmtCtxt"
586 PatGuard _ -> notImplemented "PatGuard"
708 PatGuard _ -> notImplemented "PatGuard"
587 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
709 ParStmtCtxt _ -> notImplemented "ParStmtCtxt"
588 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
710 TransStmtCtxt _ -> notImplemented "TransStmtCtxt"
589 ExplicitList _ _ xs ->
711 ExplicitList _ _ xs ->
590− brackets . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_hsExpr) xs
712+ brackets s $
713+ sep commaDel (sitcc . located' p_hsExpr) xs
591 RecordCon {..} -> do
714 RecordCon {..} -> do
592 located rcon_con_name atom
715 located rcon_con_name atom
593 breakpoint
716 breakpoint
594 let HsRecFields {..} = rcon_flds
717 let HsRecFields {..} = rcon_flds
595− fields = located' p_hsRecField <$> rec_flds
718+ updName f =
719+ (f :: HsRecField GhcPs (LHsExpr GhcPs))
720+ { hsRecFieldLbl = case unLoc $ hsRecFieldLbl f of
722+ XFieldOcc x -> noExtCon x
724+ fields = located' (p_hsRecField . updName) <$> rec_flds
597 case rec_dotdot of
726 case rec_dotdot of
598 Just {} -> [txt ".."]
727 Just {} -> [txt ".."]
599 Nothing -> []
728 Nothing -> []
600− inci . braces . sitcc $ sep (comma >> breakpoint) sitcc (fields <> dotdot)
729+ inci . braces N $
730+ sep commaDel sitcc (fields <> dotdot)
601 RecordUpd {..} -> do
731 RecordUpd {..} -> do
602 located rupd_expr p_hsExpr
732 located rupd_expr p_hsExpr
603− breakpoint
733+ useRecordDot' <- useRecordDot
604− inci . braces . sitcc $
734+ let mrs sp = case getLoc sp of
605− sep (comma >> breakpoint) (sitcc . located' p_hsRecField) rupd_flds
735+ RealSrcSpan r -> Just r
606− ExprWithTySig affix x -> sitcc $ do
736+ _ -> Nothing
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
607 located x p_hsExpr
754 located x p_hsExpr
608 breakpoint
757 breakpoint
609− inci $ do
758+ inci $ located hsib_body p_hsType
610− txt ":: "
759+ ExprWithTySig NoExtField _ HsWC {hswc_body = XHsImplicitBndrs x} -> noExtCon x
611− let HsWC {..} = affix
760+ ExprWithTySig NoExtField _ (XHsWildCardBndrs x) -> noExtCon x
612− HsIB {..} = hswc_body
761+ ArithSeq NoExtField _ x ->
613− located hsib_body p_hsType
614− ArithSeq NoExt _ x -> do
615 case x of
762 case x of
616− From from -> brackets . sitcc $ do
763+ From from -> brackets s $ do
617 located from p_hsExpr
764 located from p_hsExpr
618 breakpoint
765 breakpoint
620− FromThen from next -> brackets . sitcc $ do
767+ FromThen from next -> brackets s $ do
621− sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
768+ sep commaDel (located' p_hsExpr) [from, next]
622 breakpoint
769 breakpoint
624− FromTo from to -> brackets . sitcc $ do
771+ FromTo from to -> brackets s $ do
625 located from p_hsExpr
772 located from p_hsExpr
626 breakpoint
773 breakpoint
627− txt ".. "
774+ txt ".."
628 located to p_hsExpr
776 located to p_hsExpr
629− FromThenTo from next to -> brackets . sitcc $ do
777+ FromThenTo from next to -> brackets s $ do
630− sitcc $ sep (comma >> breakpoint) (located' p_hsExpr) [from, next]
778+ sep commaDel (located' p_hsExpr) [from, next]
631 breakpoint
779 breakpoint
632− txt ".. "
780+ txt ".."
633 located to p_hsExpr
782 located to p_hsExpr
634− HsSCC NoExt _ name x -> do
783+ HsSCC NoExtField _ name x -> do
635 txt "{-# SCC "
784 txt "{-# SCC "
636 atom name
785 atom name
637 txt " #-}"
786 txt " #-}"
638 breakpoint
787 breakpoint
639 located x p_hsExpr
788 located x p_hsExpr
640− HsCoreAnn NoExt _ value x -> do
789+ HsCoreAnn NoExtField _ value x -> do
641 txt "{-# CORE "
790 txt "{-# CORE "
642 atom value
791 atom value
643 txt " #-}"
792 txt " #-}"
644 breakpoint
793 breakpoint
645 located x p_hsExpr
794 located x p_hsExpr
646− HsBracket NoExt x -> p_hsBracket x
795+ HsBracket NoExtField x -> p_hsBracket x
647 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
796 HsRnBracketOut {} -> notImplemented "HsRnBracketOut"
648 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
797 HsTcBracketOut {} -> notImplemented "HsTcBracketOut"
649− HsSpliceE NoExt splice -> p_hsSplice splice
798+ HsSpliceE NoExtField splice -> p_hsSplice splice
650− HsProc NoExt p e -> do
799+ HsProc NoExtField p e -> do
651 txt "proc"
800 txt "proc"
652 located p $ \x -> do
801 located p $ \x -> do
653 breakpoint
802 breakpoint
@@ -656,92 +805,159 @@ p_hsExpr = \case
657 placeHanging (cmdTopPlacement (unLoc e)) $
806 placeHanging (cmdTopPlacement (unLoc e)) $
658 located e p_hsCmdTop
807 located e p_hsCmdTop
659− HsStatic _ e -> do
808+ HsStatic _ e -> do
660 txt "static"
809 txt "static"
661 breakpoint
810 breakpoint
662 inci (located e p_hsExpr)
811 inci (located e p_hsExpr)
663− HsArrApp NoExt body input arrType cond ->
664− p_hsCmd (HsCmdArrApp NoExt body input arrType cond)
665− HsArrForm NoExt form mfixity cmds ->
666− p_hsCmd (HsCmdArrForm NoExt form Prefix mfixity cmds)
667 HsTick {} -> notImplemented "HsTick"
812 HsTick {} -> notImplemented "HsTick"
668 HsBinTick {} -> notImplemented "HsBinTick"
813 HsBinTick {} -> notImplemented "HsBinTick"
669 HsTickPragma {} -> notImplemented "HsTickPragma"
814 HsTickPragma {} -> notImplemented "HsTickPragma"
670− EWildPat NoExt -> txt "_"
671− EAsPat {} -> notImplemented "EAsPat"
672− EViewPat {} -> notImplemented "EViewPat"
673− ELazyPat {} -> notImplemented "ELazyPat"
674 HsWrap {} -> notImplemented "HsWrap"
815 HsWrap {} -> notImplemented "HsWrap"
675− XExpr {} -> notImplemented "XExpr"
816+ XExpr x -> noExtCon x
677p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
818p_patSynBind :: PatSynBind GhcPs GhcPs -> R ()
678p_patSynBind PSB {..} = do
819p_patSynBind PSB {..} = do
679− txt "pattern "
820+ let rhs = do
680− case psb_dir of
821+ space
681− Unidirectional -> do
822+ case psb_dir of
682− p_rdrName psb_id
823+ Unidirectional -> do
683− inci $ do
824+ txt "<-"
684− p_patSynDetails psb_args
825+ breakpoint
685− txt " <-"
826+ located psb_def p_pat
686− breakpoint
827+ ImplicitBidirectional -> do
687− located psb_def p_pat
828+ equals
688− ImplicitBidirectional -> do
829+ breakpoint
830+ located psb_def p_pat
831+ ExplicitBidirectional mgroup -> do
834+ located psb_def p_pat
838+ inci (p_matchGroup (Function psb_id) mgroup)
689 p_rdrName psb_id
843 p_rdrName psb_id
690 inci $ do
844 inci $ do
691− p_patSynDetails psb_args
845+ switchLayout (getLoc <$> xs) $ do
692− txt " ="
846+ unless (null xs) breakpoint
693− breakpoint
847+ sitcc (sep breakpoint p_rdrName xs)
694− located psb_def p_pat
848+ rhs
695− ExplicitBidirectional mgroup -> do
849+ RecCon xs -> do
696 p_rdrName psb_id
851 p_rdrName psb_id
697 inci $ do
852 inci $ do
698− p_patSynDetails psb_args
853+ switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
699− txt " <-"
854+ unless (null xs) breakpoint
856+ sep commaDel (p_rdrName . recordPatSynPatVar) xs
859+ switchLayout [getLoc l, getLoc r] $ do
700 breakpoint
862 breakpoint
701− located psb_def p_pat
863+ inci $ do
702− newline
864+ p_rdrName psb_id
703− line (txt "where")
865+ space
704− inci (p_matchGroup (Function psb_id) mgroup)
866+ p_rdrName r
705−p_patSynBind (XPatSynBind NoExt) = notImplemented "XPatSynBind"
867+ inci rhs
706−
868+p_patSynBind (XPatSynBind x) = noExtCon x
707−p_patSynDetails :: HsPatSynDetails (Located RdrName) -> R ()
869+
708−p_patSynDetails = \case
870+p_case ::
709− PrefixCon xs ->
871+ Data body =>
710− switchLayout (getLoc <$> xs) $ do
872+ -- | Placer
711− unless (null xs) breakpoint
873+ (body -> Placement) ->
712− sitcc (sep breakpoint p_rdrName xs)
874+ -- | Render
713− RecCon xs ->
875+ (body -> R ()) ->
714− switchLayout (getLoc . recordPatSynPatVar <$> xs) $ do
876+ -- | Expression
715− unless (null xs) breakpoint
877+ LHsExpr GhcPs ->
716− braces . sitcc $ sep (comma >> breakpoint) (p_rdrName . recordPatSynPatVar) xs
878+ -- | Match group
717− InfixCon _ _ -> notImplemented "InfixCon"
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)
719p_pat :: Pat GhcPs -> R ()
935p_pat :: Pat GhcPs -> R ()
720p_pat = \case
936p_pat = \case
721− WildPat NoExt -> txt "_"
937+ WildPat NoExtField -> txt "_"
722− VarPat NoExt name -> p_rdrName name
938+ VarPat NoExtField name -> p_rdrName name
723− LazyPat NoExt pat -> do
939+ LazyPat NoExtField pat -> do
725 located pat p_pat
941 located pat p_pat
726− AsPat NoExt name pat -> do
942+ AsPat NoExtField name pat -> do
727 p_rdrName name
943 p_rdrName name
729 located pat p_pat
945 located pat p_pat
730− ParPat NoExt pat ->
946+ ParPat NoExtField pat ->
731− located pat (parens . p_pat)
947+ located pat (parens S . p_pat)
732− BangPat NoExt pat -> do
948+ BangPat NoExtField pat -> do
734 located pat p_pat
950 located pat p_pat
735− ListPat NoExt pats -> do
951+ ListPat NoExtField pats ->
736− brackets . sitcc $ sep (comma >> breakpoint) (located' p_pat) pats
952+ brackets S $ sep commaDel (located' p_pat) pats
737− TuplePat NoExt pats boxing -> do
953+ TuplePat NoExtField pats boxing -> do
738− let f =
954+ let parens' =
739 case boxing of
955 case boxing of
740− Boxed -> parens
956+ Boxed -> parens S
741− Unboxed -> parensHash
957+ Unboxed -> parensHash S
742− f . sitcc $ sep (comma >> breakpoint) (sitcc . located' p_pat) pats
958+ parens' $ sep commaDel (sitcc . located' p_pat) pats
743− SumPat NoExt pat tag arity ->
959+ SumPat NoExtField pat tag arity ->
744− p_unboxedSum tag arity (located pat p_pat)
960+ p_unboxedSum S tag arity (located pat p_pat)
745 ConPatIn pat details ->
961 ConPatIn pat details ->
746 case details of
962 case details of
747 PrefixCon xs -> sitcc $ do
963 PrefixCon xs -> sitcc $ do
@@ -755,102 +971,115 @@ p_pat = \case
755 let f = \case
971 let f = \case
756 Nothing -> txt ".."
972 Nothing -> txt ".."
757 Just x -> located x p_pat_hsRecField
973 Just x -> located x p_pat_hsRecField
758− inci . braces . sitcc . sep (comma >> breakpoint) f $ case dotdot of
974+ inci . braces N . sep commaDel f $
759− Nothing -> Just <$> fields
975+ case dotdot of
760− Just n -> (Just <$> take n fields) ++ [Nothing]
976+ Nothing -> Just <$> fields
761− InfixCon x y -> do
977+ Just (L _ n) -> (Just <$> take n fields) ++ [Nothing]
762− located x p_pat
978+ InfixCon l r -> do
763− space
979+ switchLayout [getLoc l, getLoc r] $ do
764− p_rdrName pat
980+ located l p_pat
765− breakpoint
981+ breakpoint
766− inci (located y p_pat)
982+ inci $ do
767 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
986 ConPatOut {} -> notImplemented "ConPatOut" -- presumably created by renamer?
768− ViewPat NoExt expr pat -> sitcc $ do
987+ ViewPat NoExtField expr pat -> sitcc $ do
769 located expr p_hsExpr
988 located expr p_hsExpr
771 breakpoint
991 breakpoint
772 inci (located pat p_pat)
992 inci (located pat p_pat)
773− SplicePat NoExt splice -> p_hsSplice splice
993+ SplicePat NoExtField splice -> p_hsSplice splice
774− LitPat NoExt p -> atom p
994+ LitPat NoExtField p -> atom p
775− NPat NoExt v _ _ -> located v (atom . ol_val)
995+ NPat NoExtField v _ _ -> located v (atom . ol_val)
776− NPlusKPat NoExt n k _ _ _ -> sitcc $ do
996+ NPlusKPat NoExtField n k _ _ _ -> sitcc $ do
777 p_rdrName n
997 p_rdrName n
778 breakpoint
998 breakpoint
779 inci $ do
999 inci $ do
780− txt "+ "
1000+ txt "+"
781 located k (atom . ol_val)
1002 located k (atom . ol_val)
782− SigPat hswc pat -> do
1003+ SigPat NoExtField pat hswc -> do
783 located pat p_pat
1004 located pat p_pat
784 p_typeAscription hswc
1005 p_typeAscription hswc
785 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
1006 CoPat {} -> notImplemented "CoPat" -- apparently created at some later stage
786− XPat NoExt -> notImplemented "XPat"
1007+ XPat x -> noExtCon x
788p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
1009p_pat_hsRecField :: HsRecField' (FieldOcc GhcPs) (LPat GhcPs) -> R ()
789p_pat_hsRecField HsRecField {..} = do
1010p_pat_hsRecField HsRecField {..} = do
790 located hsRecFieldLbl $ \x ->
1011 located hsRecFieldLbl $ \x ->
791 p_rdrName (rdrNameFieldOcc x)
1012 p_rdrName (rdrNameFieldOcc x)
792 unless hsRecPun $ do
1013 unless hsRecPun $ do
794 breakpoint
1016 breakpoint
795 inci (located hsRecFieldArg p_pat)
1017 inci (located hsRecFieldArg p_pat)
797−p_unboxedSum :: ConTag -> Arity -> R () -> R ()
1019+p_unboxedSum :: BracketStyle -> ConTag -> Arity -> R () -> R ()
798−p_unboxedSum tag arity m = do
1020+p_unboxedSum s tag arity m = do
799 let before = tag - 1
1021 let before = tag - 1
800 after = arity - before - 1
1022 after = arity - before - 1
801 args = replicate before Nothing <> [Just m] <> replicate after Nothing
1023 args = replicate before Nothing <> [Just m] <> replicate after Nothing
802− f (x,i) = do
1024+ f x =
803− let isFirst = i == 0
804− isLast = i == arity - 1
805 case x :: Maybe (R ()) of
1025 case x :: Maybe (R ()) of
806 Nothing ->
1026 Nothing ->
807− unless (isFirst || isLast) space
1027+ space
808 Just m' -> do
1028 Just m' -> do
809− unless isFirst space
1029+ space
811− unless isLast space
1031+ space
812− parensHash $ sep (txt "|") f (zip args [0..])
1032+ parensHash s $ sep (txt "|") f args
814p_hsSplice :: HsSplice GhcPs -> R ()
1034p_hsSplice :: HsSplice GhcPs -> R ()
815p_hsSplice = \case
1035p_hsSplice = \case
816− HsTypedSplice NoExt deco _ expr -> p_hsSpliceTH True expr deco
1036+ HsTypedSplice NoExtField deco _ expr -> p_hsSpliceTH True expr deco
817− HsUntypedSplice NoExt deco _ expr -> p_hsSpliceTH False expr deco
1037+ HsUntypedSplice NoExtField deco _ expr -> p_hsSpliceTH False expr deco
818− HsQuasiQuote NoExt _ quoterName srcSpan str -> do
1038+ HsQuasiQuote NoExtField _ quoterName srcSpan str -> do
820 p_rdrName (L srcSpan quoterName)
1040 p_rdrName (L srcSpan quoterName)
822− -- NOTE QuasiQuoters often rely on precise custom strings. We cannot do
1042+ -- QuasiQuoters often rely on precise custom strings. We cannot do any
823− -- any formatting here without potentially breaking someone's code.
1043+ -- formatting here without potentially breaking someone's code.
824 atom str
1044 atom str
825 txt "|]"
1045 txt "|]"
826 HsSpliced {} -> notImplemented "HsSpliced"
1046 HsSpliced {} -> notImplemented "HsSpliced"
827− XSplice {} -> notImplemented "XSplice"
1047+ HsSplicedT {} -> notImplemented "HsSplicedT"
1048+ XSplice x -> noExtCon x
829−p_hsSpliceTH
1050+p_hsSpliceTH ::
830− :: Bool -- ^ Typed splice?
1051+ -- | Typed splice?
831− -> LHsExpr GhcPs -- ^ Splice expression
1052+ Bool ->
832− -> SpliceDecoration -- ^ Splice decoration
1053+ -- | Splice expression
833− -> R ()
1054+ LHsExpr GhcPs ->
1055+ -- | Splice decoration
1056+ SpliceDecoration ->
834p_hsSpliceTH isTyped expr = \case
1058p_hsSpliceTH isTyped expr = \case
835 HasParens -> do
1059 HasParens -> do
836 txt decoSymbol
1060 txt decoSymbol
837− parens (located expr (sitcc . p_hsExpr))
1061+ parens N (located expr (sitcc . p_hsExpr))
838 HasDollar -> do
1062 HasDollar -> do
839 txt decoSymbol
1063 txt decoSymbol
840 located expr (sitcc . p_hsExpr)
1064 located expr (sitcc . p_hsExpr)
841− NoParens -> do
1065+ NoParens ->
842 located expr (sitcc . p_hsExpr)
1066 located expr (sitcc . p_hsExpr)
844 decoSymbol = if isTyped then "$$" else "$"
1068 decoSymbol = if isTyped then "$$" else "$"
846p_hsBracket :: HsBracket GhcPs -> R ()
1070p_hsBracket :: HsBracket GhcPs -> R ()
847p_hsBracket = \case
1071p_hsBracket = \case
848− ExpBr NoExt expr -> quote "e" (located expr p_hsExpr)
1072+ ExpBr NoExtField expr -> do
849− PatBr NoExt pat -> quote "p" (located pat p_pat)
1073+ anns <- getEnclosingAnns
850− DecBrL NoExt decls -> quote "d" (p_hsDecls Free decls)
1074+ let name = case anns of
851− DecBrG NoExt _ -> notImplemented "DecBrG" -- result of renamer
1075+ AnnOpenEQ : _ -> ""
852− TypBr NoExt ty -> quote "t" (located ty p_hsType)
1076+ _ -> "e"
853− VarBr NoExt isSingleQuote name -> do
1077+ quote name (located expr p_hsExpr)
1078+ PatBr NoExtField pat -> located pat (quote "p" . p_pat)
1079+ DecBrL NoExtField decls -> quote "d" (p_hsDecls Free decls)
1080+ DecBrG NoExtField _ -> notImplemented "DecBrG" -- result of renamer
1081+ TypBr NoExtField ty -> quote "t" (located ty p_hsType)
1082+ VarBr NoExtField isSingleQuote name -> do
854 txt (bool "''" "'" isSingleQuote)
1083 txt (bool "''" "'" isSingleQuote)
855 -- HACK As you can see we use 'noLoc' here to be able to pass name into
1084 -- HACK As you can see we use 'noLoc' here to be able to pass name into
856 -- 'p_rdrName' since the latter expects a "located" thing. The problem
1085 -- 'p_rdrName' since the latter expects a "located" thing. The problem
@@ -858,19 +1087,20 @@ p_hsBracket = \case
858 -- turn makes it impossible to detect if there are parentheses around
1087 -- turn makes it impossible to detect if there are parentheses around
859 -- it, etc. So we have to add parentheses manually assuming they are
1088 -- it, etc. So we have to add parentheses manually assuming they are
860 -- necessary for all operators.
1089 -- necessary for all operators.
861− let isOperator = all
1090+ let isOperator =
862− (\i -> isPunctuation i || isSymbol i)
1091+ all
863− (showOutputable (rdrNameOcc name))
1092+ (\i -> isPunctuation i || isSymbol i)
864− && not (doesNotNeedExtraParens name)
1093+ (showOutputable (rdrNameOcc name))
865− wrapper = if isOperator then parens else id
1094+ && not (doesNotNeedExtraParens name)
1095+ wrapper = if isOperator then parens N else id
866 wrapper $ p_rdrName (noLoc name)
1096 wrapper $ p_rdrName (noLoc name)
867− TExpBr NoExt expr -> do
1097+ TExpBr NoExtField expr -> do
868 txt "[||"
1098 txt "[||"
869 breakpoint'
1099 breakpoint'
870 located expr p_hsExpr
1100 located expr p_hsExpr
871 breakpoint'
1101 breakpoint'
872 txt "||]"
1102 txt "||]"
873− XBracket {} -> notImplemented "XBracket"
1103+ XBracket x -> noExtCon x
875 quote :: Text -> R () -> R ()
1105 quote :: Text -> R () -> R ()
876 quote name body = do
1106 quote name body = do
@@ -883,12 +1113,65 @@ p_hsBracket = \case
883 breakpoint'
1113 breakpoint'
884 txt "|]"
1114 txt "|]"
1116+-- Print the source text of a string literal while indenting
1119+p_stringLit :: String -> R ()
1121+ let s = splitGaps src
1123+ txt $ Text.pack (mconcat s)
1125+ sitcc $ sep breakpoint (txt . Text.pack) (backslashes s)
1126+ in vlayout singleLine multiLine
1128+ -- Split a string on gaps (backslash delimited whitespaces)
1130+ -- > splitGaps "bar\\ \\fo\\&o" == ["bar", "fo\\&o"]
1131+ splitGaps :: String -> [String]
1134+ let -- A backslash and a whitespace starts a "gap"
1135+ p (Just '\\', _, _) = True
1136+ p (_, '\\', Just c) | ghcSpace c = False
1138+ in case span p (zipPrevNext s) of
1140+ let -- drop the initial '\', any amount of 'ghcSpace', and another '\'
1141+ r' = drop 1 . dropWhile ghcSpace . drop 1 $ map orig r
1142+ in map orig l : splitGaps r'
1143+ -- GHC's definition of whitespaces in strings
1144+ -- See: https://gitlab.haskell.org/ghc/ghc/blob/86753475/compiler/parser/Lexer.x#L1653
1145+ ghcSpace :: Char -> Bool
1146+ ghcSpace c = c <= '\x7f' && is_space c
1147+ -- Add backslashes to the inner side of the strings
1149+ -- > backslashes ["a", "b", "c"] == ["a\\", "\\b\\", "\\c"]
1150+ backslashes :: [String] -> [String]
1151+ backslashes (x : y : xs) = (x ++ "\\") : backslashes (('\\' : y) : xs)
1152+ backslashes xs = xs
1153+ -- Attaches previous and next items to each list element
1154+ zipPrevNext :: [a] -> [(Maybe a, a, Maybe a)]
1158+ (zip (Nothing : map Just xs) xs)
1159+ (map Just (tail xs) ++ repeat Nothing)
1160+ in map (\((p, x), n) -> (p, x, n)) z
886----------------------------------------------------------------------------
1163----------------------------------------------------------------------------
887-- Helpers
1164-- Helpers
1166+-- | Return the wrapping function controlling the use of braces according to
1167+-- the current layout.
1168+layoutToBraces :: Layout -> R () -> R ()
1169+layoutToBraces = \case
1170+ SingleLine -> useBraces
889-- | Append each element in both lists with semigroups. If one list is shorter
1173-- | Append each element in both lists with semigroups. If one list is shorter
890-- than the other, return the rest of the longer list unchanged.
1174-- than the other, return the rest of the longer list unchanged.
892liftAppend :: Semigroup a => [a] -> [a] -> [a]
1175liftAppend :: Semigroup a => [a] -> [a] -> [a]
893liftAppend [] [] = []
1176liftAppend [] [] = []
894liftAppend [] (y : ys) = y : ys
1177liftAppend [] (y : ys) = y : ys
@@ -896,15 +1179,15 @@ liftAppend (x : xs) [] = x : xs
896liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
1179liftAppend (x : xs) (y : ys) = x <> y : liftAppend xs ys
898getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
1181getGRHSSpan :: GRHS GhcPs (Located body) -> SrcSpan
899−getGRHSSpan (GRHS NoExt _ body) = getLoc body
1182+getGRHSSpan (GRHS NoExtField guards body) =
900−getGRHSSpan (XGRHS NoExt) = notImplemented "XGRHS"
1183+ combineSrcSpans' $ getLoc body :| map getLoc guards
1184+getGRHSSpan (XGRHS x) = noExtCon x
902-- | Place a thing that may have a hanging form. This function handles how
1186-- | Place a thing that may have a hanging form. This function handles how
903-- to separate it from preceding expressions and whether to bump indentation
1187-- to separate it from preceding expressions and whether to bump indentation
904-- depending on what sort of expression we have.
1188-- depending on what sort of expression we have.
906placeHanging :: Placement -> R () -> R ()
1189placeHanging :: Placement -> R () -> R ()
907−placeHanging placement m = do
1190+placeHanging placement m =
908 case placement of
1191 case placement of
909 Hanging -> do
1192 Hanging -> do
@@ -915,53 +1198,165 @@ placeHanging placement m = do
916-- | Check if given block contains single expression which has a hanging
1199-- | Check if given block contains single expression which has a hanging
918−
1201+blockPlacement ::
919−blockPlacement
1202+ (body -> Placement) ->
920− :: (body -> Placement)
1203+ [LGRHS GhcPs (Located body)] ->
921− -> [LGRHS GhcPs (Located body)]
1204+ Placement
922− -> Placement
1205+blockPlacement placer [L _ (GRHS NoExtField _ (L _ x))] = placer x
923−blockPlacement placer [(L _ (GRHS NoExt _ (L _ x)))] = placer x
924blockPlacement _ _ = Normal
1206blockPlacement _ _ = Normal
926-- | Check if given command has a hanging form.
1208-- | Check if given command has a hanging form.
928cmdPlacement :: HsCmd GhcPs -> Placement
1209cmdPlacement :: HsCmd GhcPs -> Placement
929cmdPlacement = \case
1210cmdPlacement = \case
930− HsCmdLam NoExt _ -> Hanging
1211+ HsCmdLam NoExtField _ -> Hanging
931− HsCmdCase NoExt _ _ -> Hanging
1212+ HsCmdCase NoExtField _ _ -> Hanging
932− HsCmdDo NoExt _ -> Hanging
1213+ HsCmdDo NoExtField _ -> Hanging
933 _ -> Normal
1214 _ -> Normal
935cmdTopPlacement :: HsCmdTop GhcPs -> Placement
1216cmdTopPlacement :: HsCmdTop GhcPs -> Placement
936cmdTopPlacement = \case
1217cmdTopPlacement = \case
937− HsCmdTop NoExt (L _ x) -> cmdPlacement x
1218+ HsCmdTop NoExtField (L _ x) -> cmdPlacement x
938− XCmdTop {} -> notImplemented "XCmdTop"
1219+ XCmdTop x -> noExtCon x
940-- | Check if given expression has a hanging form.
1221-- | Check if given expression has a hanging form.
942exprPlacement :: HsExpr GhcPs -> Placement
1222exprPlacement :: HsExpr GhcPs -> Placement
943exprPlacement = \case
1223exprPlacement = \case
944− HsLam NoExt _ -> Hanging
1224+ -- Only hang lambdas with single line parameter lists
945− HsLamCase NoExt _ -> Hanging
1225+ HsLam NoExtField mg -> case mg of
946− HsCase NoExt _ _ -> Hanging
1226+ MG _ (L _ [L _ (Match NoExtField _ (x : xs) _)]) _
947− HsDo NoExt DoExpr _ -> Hanging
1227+ | isOneLineSpan (combineSrcSpans' $ fmap getLoc (x :| xs)) ->
948− HsDo NoExt MDoExpr _ -> Hanging
1228+ Hanging
949− RecordCon NoExt _ _ -> Hanging
1229+ _ -> Normal
950− -- If the rightmost expression in an operator chain is hanging, make the
1230+ HsLamCase NoExtField _ -> Hanging
951− -- whole block hanging; so that we can use the common @f = foo $ do@
1231+ HsCase NoExtField _ _ -> Hanging
952− -- style.
1232+ HsDo NoExtField DoExpr _ -> Hanging
953− OpApp NoExt _ _ y -> exprPlacement (unLoc y)
1233+ HsDo NoExtField MDoExpr _ -> Hanging
954− HsProc NoExt (L s _) _ ->
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 _ ->
955 -- Indentation breaks if pattern is longer than one line and left
1240 -- Indentation breaks if pattern is longer than one line and left
956 -- hanging. Consequently, only apply hanging when it is safe.
1241 -- hanging. Consequently, only apply hanging when it is safe.
957− if isOneLineSpan s
1242+ if isOneLineSpan (getLoc p)
958− then Hanging
1243+ then Hanging
959− else Normal
1244+ else Normal
960 _ -> Normal
1245 _ -> Normal
962withGuards :: [LGRHS GhcPs (Located body)] -> Bool
1247withGuards :: [LGRHS GhcPs (Located body)] -> Bool
963withGuards = any (checkOne . unLoc)
1248withGuards = any (checkOne . unLoc)
965 checkOne :: GRHS GhcPs (Located body) -> Bool
1250 checkOne :: GRHS GhcPs (Located body) -> Bool
966− checkOne (GRHS NoExt [] _) = False
1251+ checkOne (GRHS NoExtField [] _) = False
967 checkOne _ = True
1252 checkOne _ = True
1254+exprOpTree :: LHsExpr GhcPs -> OpTree (LHsExpr GhcPs) (LHsExpr GhcPs)
1255+exprOpTree (L _ (OpApp NoExtField x op y)) = OpBranch (exprOpTree x) op (exprOpTree y)
1256+exprOpTree n = OpNode n
1258+getOpName :: HsExpr GhcPs -> Maybe RdrName
1260+ HsVar NoExtField (L _ a) -> Just a
1263+getOpNameStr :: RdrName -> String
1264+getOpNameStr = occNameString . rdrNameOcc
1267+ -- | Bracket style to use
1269+ OpTree (LHsExpr GhcPs) (LHsExpr GhcPs) ->
1271+p_exprOpTree s (OpNode x) = located x (p_hsExpr' s)
1272+p_exprOpTree s (OpBranch x op y) = do
1273+ -- If the beginning of the first argument and the second argument are on
1274+ -- the same line, and the second argument has a hanging form, use hanging
1278+ (mkSrcSpan (srcSpanStart (opTreeLoc x)) (srcSpanStart (opTreeLoc y)))
1280+ OpNode (L _ n) -> exprPlacement n
1283+ -- Distinguish holes used in infix notation.
1284+ -- eg. '1 _foo 2' and '1 `_foo` 2'
1285+ opWrapper = case unLoc op of
1286+ HsUnboundVar NoExtField _ -> backticks
1288+ layout <- getLayout
1289+ let ub = case layout of
1290+ SingleLine -> useBraces
1291+ MultiLine -> case placement of
1292+ Hanging -> useBraces
1293+ Normal -> dontUseBraces
1294+ opNameStr = (fmap getOpNameStr . getOpName . unLoc) op
1295+ gotDollar = opNameStr == Just "$"
1296+ gotColon = opNameStr == Just ":"
1297+ gotRecordDot = isRecordDot (unLoc op) (opTreeLoc y)
1299+ switchLayout [opTreeLoc x] $
1301+ p_op = located op (opWrapper . p_hsExpr)
1302+ p_y = switchLayout [opTreeLoc y] (p_exprOpTree N y)
1303+ isSection = case (opTreeLoc x, getLoc op) of
1304+ (RealSrcSpan treeSpan, RealSrcSpan opSpan) ->
1305+ srcSpanEndCol treeSpan /= srcSpanStartCol opSpan
1308+ OpNode (L _ HsDo {}) -> True
1310+ useRecordDot' <- useRecordDot
1322+ inciIf (isDoBlock y) p_y
1324+ && isOneLineSpan (opTreeLoc x)
1325+ && placement == Normal -> do
1331+ | useRecordDot' && gotRecordDot -> do
1333+ when isSection space
1338+ placeHanging placement $ do
1343+-- | Return 'True' if given expression is a record-dot operator expression.
1345+ -- | Operator expression
1347+ -- | Span of the expression on the right-hand side of the operator
1350+isRecordDot op (RealSrcSpan ySpan) = case op of
1351+ HsVar NoExtField (L (RealSrcSpan opSpan) opName) ->
1352+ (getOpNameStr opName == ".") && (srcSpanEndCol opSpan == srcSpanStartCol ySpan)
1354+isRecordDot _ _ = False
1356+-- | Get annotations for the enclosing element.
1357+getEnclosingAnns :: R [AnnKeywordId]
1358+getEnclosingAnns = do
1359+ e <- getEnclosingSpan (const True)
1361+ Nothing -> return []
1362+ Just e' -> getAnns (RealSrcSpan e')