127 lines
4.4 KiB
Haskell
127 lines
4.4 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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module Language.Haskell.Brittany.Internal.Layouters.Stmt
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( layoutStmt
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)
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where
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#include "prelude.inc"
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import Language.Haskell.Brittany.Internal.Types
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import Language.Haskell.Brittany.Internal.LayouterBasics
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import Language.Haskell.Brittany.Internal.Config.Types
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import GHC ( runGhc
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, GenLocated(L)
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, moduleNameString
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)
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#if MIN_VERSION_ghc(8,10,1) /* ghc-8.10.1 */
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import GHC.Hs
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#else
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import HsSyn
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#endif
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import Name
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import qualified FastString
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import BasicTypes
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import Language.Haskell.Brittany.Internal.Layouters.Pattern
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import Language.Haskell.Brittany.Internal.Layouters.Decl
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import {-# SOURCE #-} Language.Haskell.Brittany.Internal.Layouters.Expr
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layoutStmt :: ToBriDoc' (StmtLR GhcPs GhcPs (LHsExpr GhcPs))
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layoutStmt lstmt@(L _ stmt) = do
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indentPolicy <- mAsk <&> _conf_layout .> _lconfig_indentPolicy .> confUnpack
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indentAmount :: Int <-
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mAsk <&> _conf_layout .> _lconfig_indentAmount .> confUnpack
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docWrapNode lstmt $ case stmt of
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LastStmt _ body False _ -> do
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layoutExpr body
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BindStmt _ lPat expr _ _ -> do
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patDoc <- fmap return $ colsWrapPat =<< layoutPat lPat
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expDoc <- docSharedWrapper layoutExpr expr
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docAlt
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[ docCols
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ColBindStmt
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[ appSep patDoc
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, docSeq
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[ appSep $ docLit $ Text.pack "<-"
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, docAddBaseY BrIndentRegular $ docForceParSpacing expDoc
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]
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]
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, docCols
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ColBindStmt
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[ appSep patDoc
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, docAddBaseY BrIndentRegular
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$ docPar (docLit $ Text.pack "<-") (expDoc)
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]
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]
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LetStmt _ binds -> do
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let isFree = indentPolicy == IndentPolicyFree
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let indentFourPlus = indentAmount >= 4
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layoutLocalBinds binds >>= \case
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Nothing -> docLit $ Text.pack "let"
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-- i just tested the above, and it is indeed allowed. heh.
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Just [] -> docLit $ Text.pack "let" -- this probably never happens
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Just [bindDoc] -> docAlt
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[ -- let bind = expr
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docCols
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ColDoLet
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[ appSep $ docLit $ Text.pack "let"
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, let
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f = case indentPolicy of
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IndentPolicyFree -> docSetBaseAndIndent
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IndentPolicyLeft -> docForceSingleline
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IndentPolicyMultiple | indentFourPlus -> docSetBaseAndIndent
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| otherwise -> docForceSingleline
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in f $ return bindDoc
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]
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, -- let
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-- bind = expr
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docAddBaseY BrIndentRegular $ docPar
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(docLit $ Text.pack "let")
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(docSetBaseAndIndent $ return bindDoc)
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]
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Just bindDocs -> runFilteredAlternative $ do
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-- let aaa = expra
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-- bbb = exprb
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-- ccc = exprc
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addAlternativeCond (isFree || indentFourPlus) $ docSeq
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[ appSep $ docLit $ Text.pack "let"
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, let f = if indentFourPlus
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then docEnsureIndent BrIndentRegular
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else docSetBaseAndIndent
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in f $ docLines $ return <$> bindDocs
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]
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-- let
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-- aaa = expra
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-- bbb = exprb
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-- ccc = exprc
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addAlternativeCond (not indentFourPlus)
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$ docAddBaseY BrIndentRegular
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$ docPar (docLit $ Text.pack "let")
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(docSetBaseAndIndent $ docLines $ return <$> bindDocs)
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RecStmt _ stmts _ _ _ _ _ -> runFilteredAlternative $ do
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-- rec stmt1
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-- stmt2
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-- stmt3
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addAlternativeCond (indentPolicy == IndentPolicyFree) $ docSeq
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[ docLit (Text.pack "rec")
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, docSeparator
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, docSetBaseAndIndent $ docLines $ layoutStmt <$> stmts
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]
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-- rec
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-- stmt1
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-- stmt2
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-- stmt3
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addAlternative $ docAddBaseY BrIndentRegular $ docPar
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(docLit (Text.pack "rec"))
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(docLines $ layoutStmt <$> stmts)
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BodyStmt _ expr _ _ -> do
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expDoc <- docSharedWrapper layoutExpr expr
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docAddBaseY BrIndentRegular $ expDoc
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_ -> briDocByExactInlineOnly "some unknown statement" lstmt
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