module Attoparsec (runSexp, runLongws, runNumcsv) where

import Control.Applicative
import Data.Attoparsec.ByteString.Char8

isLatinLetter :: Char -> Bool
isLatinLetter c = ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')

ws      = skipMany (satisfy \c -> c == ' ' || c == '\n')
open    = char '(' >> ws
close   = char ')' >> ws
ident   = skipMany1 (satisfy isLatinLetter) <* ws
sexp    = (open *> skipMany1 sexp <* close) <|> ident
runSexp = parseOnly sexp

longw     = string "thisisalongkeyword"
longws    = skipMany1 (longw *> ws) <* endOfInput
runLongws = parseOnly longws

numeral   = skipMany1 (satisfy \c -> '0' <= c && c <= '9') >> ws
comma     = char ',' >> ws
numcsv    = numeral >> skipMany1 (comma >> numeral) >> endOfInput
runNumcsv = parseOnly numcsv