23 lines
No EOL
786 B
Haskell
23 lines
No EOL
786 B
Haskell
module Parse.Literal (literal) where
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import Control.Applicative ((<$>), (<*>))
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import Control.Monad
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import Text.Parsec hiding (newline,spaces)
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import Text.Parsec.Indent
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import Parse.Helpers
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import SourceSyntax.Literal
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literal = num <|> (Str <$> str) <|> (Chr <$> chr)
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num :: IParser Literal
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num = fmap toLit (preNum <?> "number")
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where toLit n | '.' `elem` n = FloatNum (read n)
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| otherwise = IntNum (read n)
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preNum = concat <$> sequence [ option "" minus, many1 digit, option "" postNum ]
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postNum = do try $ lookAhead (string "." >> digit)
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string "."
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('.':) <$> many1 digit
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minus = try $ do string "-"
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lookAhead digit
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return "-" |