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module Error where
import Data.List (sort)
import Text.Parsec (SourcePos, errorPos)
import Text.Parsec.Error (ParseError, errorMessages, showErrorMessages)
data ErrorType = GenericError | TypeError | UnexpectedReturn | AlreadyDefined
instance Enum ErrorType where
fromEnum GenericError = 0
fromEnum TypeError = 1
fromEnum UnexpectedReturn = 2
fromEnum AlreadyDefined = 3
toEnum _ = error "toEnum is undefined for Error"
data Error = Error ErrorType String SourcePos
deriving (Eq)
instance Show Error where
show (Error _ message pos) =
show pos ++ " error: " ++ message
showParserError :: ParseError -> String
showParserError error =
show (errorPos error) ++ " error: syntax error"
++ showErrorMessages "or" "unknown parser error" " expecting" " unexpected" "end of input" (errorMessages error)
instance Ord Error where
compare (Error _ _ pos1) (Error _ _ pos2) = compare pos1 pos2
instance Eq ErrorType where
e1 == e2 = fromEnum e1 == fromEnum e2
showErrorList :: [Error] -> String
showErrorList errs = unlines $ map show (sort errs)
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