Created
January 2, 2011 16:13
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readBin :: String -> Integer | |
readBin [] = 0 | |
readBin str = (readBin $ init str) * 2 + (read [last str]) | |
parseBinNumber :: Parser LispVal | |
parseBinNumber = do char '#' | |
char 'b' | |
input <- many1 $ oneOf "01" | |
return $ Number $ readBin input | |
parseOctNumber :: Parser LispVal | |
parseOctNumber = do char '#' | |
char 'o' | |
input <- many1 $ oneOf "01234567" | |
return $ Number $ fst $ head $ readOct input | |
parseDecNumber :: Parser LispVal | |
parseDecNumber = do char '#' | |
char 'd' | |
input <- many1 digit | |
return $ Number $ read input | |
parseHexNumber :: Parser LispVal | |
parseHexNumber = do char '#' | |
char 'x' | |
input <- many1 $ oneOf "0123456789aAbBcCdDeEfF" | |
return $ Number $ fst $ head $ readHex input | |
parseDefaultNumber :: Parser LispVal | |
parseDefaultNumber = do input <- many1 digit | |
return $ Number $ read input | |
parseNumber :: Parser LispVal | |
parseNumber = parseBinNumber | |
<|> parseOctNumber | |
<|> parseDecNumber | |
<|> parseHexNumber | |
<|> parseDefaultNumber |
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