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module Lexer where
import Data.Char (digitToInt)
import Text.Parsec
import Text.Parsec.Language (emptyDef)
import Text.Parsec.String (Parser)
import qualified Text.Parsec.Token as T
scanner :: T.TokenParser ()
scanner = T.makeTokenParser style
where
ops = ["+", "*", "-", ";"]
names = ["module", "private", "def", "return", "->", "true", "false"]
style =
emptyDef
{ T.commentLine = "#",
T.reservedOpNames = ops,
T.reservedNames = names
}
binNum :: Parser Integer
binNum = do
_ <- char '0'
_ <- oneOf "bB"
digits <- many1 $ oneOf "01"
let n = foldl (\x d -> 2 * x + toInteger (digitToInt d)) 0 digits
seq n $ return n
integer :: Parser Integer
integer = binNum <|> T.integer scanner
parens :: Parser a -> Parser a
parens = T.parens scanner
braces :: Parser a -> Parser a
braces = T.braces scanner
commaSep :: Parser a -> Parser [a]
commaSep = T.commaSep scanner
colonSep :: Parser String
colonSep = T.colon scanner
identifier :: Parser String
identifier = T.identifier scanner
reserved :: String -> Parser ()
reserved = T.reserved scanner
reservedOp :: String -> Parser ()
reservedOp = T.reservedOp scanner
scan :: Parser a -> Parser a
scan p = do
T.whiteSpace scanner
r <- p
eof
return r
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