43 lines
No EOL
1.1 KiB
Haskell
43 lines
No EOL
1.1 KiB
Haskell
{-# LANGUAGE DeriveDataTypeable #-}
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module SourceSyntax.Location where
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import Text.Parsec.Pos
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import Data.Data
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data SrcPos = Pos Int Int
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deriving (Eq, Ord, Data, Typeable)
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data SrcSpan = Span SrcPos SrcPos | NoSpan
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deriving (Eq, Ord, Data, Typeable)
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data Located e = L (Maybe String) SrcSpan e deriving (Eq,Ord, Data, Typeable)
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instance Show SrcPos where
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show (Pos r c) = "Line " ++ show r ++ ", Column " ++ 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
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NoSpan -> ""
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instance Show e => Show (Located e) where
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show (L _ _ e) = show e
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none = L Nothing NoSpan
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at start end = L Nothing
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(Span (Pos (sourceLine start) (sourceColumn start))
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(Pos (sourceLine end ) (sourceColumn end )))
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merge (L _ s1 _) (L _ s2 _) = L Nothing span
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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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(_, NoSpan) -> s1
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(NoSpan, _) -> s2
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add x (L Nothing span e) = L (Just (show x)) span e
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add x (L txt span e) = L txt span e |