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Pretty print operators

This commit is contained in:
Luca Bruno 2014-07-07 17:25:28 +02:00
parent 8103ed8cc8
commit a12c576bcc
1 changed files with 32 additions and 6 deletions
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38
Nix/Pretty.hs
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@ -3,27 +3,53 @@ module Nix.Pretty where
import Text.PrettyPrint.HughesPJ
import Nix.Types
import Data.Map (toList)
import Data.Text (Text)
import Data.Text (Text, unpack)
prettyBind :: (NExpr, NExpr) -> Doc
prettyBind (n, v) = prettyNix n <+> equals <+> prettyNix v <> semi
prettySetArg :: (Text, Maybe NExpr) -> Doc
prettySetArg (n, Nothing) = text (show n)
prettySetArg (n, Just v) = text (show n) <+> text "?" <+> prettyNix v
prettySetArg (n, Nothing) = text (unpack n)
prettySetArg (n, Just v) = text (unpack n) <+> text "?" <+> prettyNix v
prettyFold = foldr ($$) empty
infixOper :: NExpr -> String -> NExpr -> Doc
infixOper l op r = prettyNix l <+> text op <+> prettyNix r
prettyOper :: NOperF NExpr -> Doc
prettyOper (NNot r) = text "!" <> prettyNix r
prettyOper (NNeg r) = text "-" <> prettyNix r
prettyOper (NEq r1 r2) = infixOper r1 "==" r2
prettyOper (NNEq r1 r2) = infixOper r1 "!=" r2
prettyOper (NLt r1 r2) = infixOper r1 "<" r2
prettyOper (NLte r1 r2) = infixOper r1 "<=" r2
prettyOper (NGt r1 r2) = infixOper r1 ">" r2
prettyOper (NGte r1 r2) = infixOper r1 ">=" r2
prettyOper (NAnd r1 r2) = infixOper r1 "&&" r2
prettyOper (NOr r1 r2) = infixOper r1 "||" r2
prettyOper (NImpl r1 r2) = infixOper r1 ">" r2
prettyOper (NUpdate r1 r2) = infixOper r1 "//" r2
prettyOper (NHasAttr r1 r2) = infixOper r1 "?" r2
prettyOper (NAttr r1 r2) = prettyNix r1 <> text "." <> prettyNix r2
prettyOper (NPlus r1 r2) = infixOper r1 "+" r2
prettyOper (NMinus r1 r2) = infixOper r1 "-" r2
prettyOper (NMult r1 r2) = infixOper r1 "*" r2
prettyOper (NDiv r1 r2) = infixOper r1 "/" r2
prettyOper (NConcat r1 r2) = infixOper r1 "++" r2
prettyNix :: NExpr -> Doc
prettyNix (Fix expr) = go expr where
go (NConstant atom) = text $ show atom
go (NOper oper) = text $ show oper
go (NConstant atom) = text $ unpack $ atomText atom
go (NOper oper) = prettyOper oper
go (NList list) = lbrack <+> (prettyFold $ map prettyNix list) <+> rbrack
go (NArgSet args) = lbrace <+> (prettyFold $ map prettySetArg $ toList args) <+> rbrace
go (NSet rec list) =
(case rec of Rec -> "rec"; otherwise -> empty)
(case rec of Rec -> "rec"; NonRec -> empty)
<+> lbrace <+> (prettyFold $ map prettyBind list) <+> rbrace
go (NLet binds body) = text "let"