56 lines
1.7 KiB
Haskell
56 lines
1.7 KiB
Haskell
{-# LANGUAGE DeriveDataTypeable #-}
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module SourceSyntax.Location where
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import Data.Data
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import Text.PrettyPrint
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import SourceSyntax.PrettyPrint
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import qualified Text.Parsec.Pos as Parsec
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data SrcPos = Pos { line :: Int, column :: Int }
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deriving (Eq, Ord, Data, Typeable)
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data SrcSpan = Span SrcPos SrcPos String | NoSpan String
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deriving (Eq, Ord, Data, Typeable)
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data Located e = L SrcSpan e
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deriving (Eq, Ord, Data, Typeable)
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none e = L (NoSpan (render $ pretty e)) e
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noneNoDocs = L (NoSpan "")
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at start end e = L (Span (Pos (Parsec.sourceLine start) (Parsec.sourceColumn start))
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(Pos (Parsec.sourceLine end ) (Parsec.sourceColumn end ))
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(render $ pretty e)) e
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merge (L s1 _) (L s2 _) e = L (span (render $ pretty e)) e
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where span = case (s1,s2) of
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(Span start _ _, Span _ end _) -> Span start end
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(Span start end _, _) -> Span start end
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(_, Span start end _) -> Span start end
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(_, _) -> NoSpan
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mergeOldDocs (L s1 _) (L s2 _) e = L span e
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where span = case (s1,s2) of
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(Span start _ d1, Span _ end d2) -> Span start end (d1 ++ "\n\n" ++ d2)
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(Span _ _ _, _) -> s1
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(_, Span _ _ _) -> s2
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(_, _) -> NoSpan ""
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sameAs (L s _) = L s
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instance Show SrcPos where
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show (Pos r c) = show r ++ "," ++ show c
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instance Show SrcSpan where
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show span =
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case span of
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Span start end _ -> show start ++ " to " ++ show end
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NoSpan str -> str
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instance Show e => Show (Located e) where
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show (L s e) = "L (" ++ show s ++ ") (" ++ show e ++ ")"
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instance Pretty a => Pretty (Located a) where
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pretty (L _ e) = pretty e
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