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import Control.Monad( liftM )
import System( getArgs )
import Text.Printf
getLines :: FilePath -> IO [String]
getLines = liftM lines . readFile
stripReturn :: String -> String
stripReturn s = if (last s == '\r') then init s else s
isComment :: String -> Bool
isComment = (==) '#' . head
isNumber :: String -> Bool
isNumber ('0':[]) = True
isNumber ('-':ns)
| ns /= [] && head ns /= '0' = isNumber ns
isNumber n = null . filter (not . isDigit) $ n
isDigit :: Char -> Bool
isDigit '0' = True
isDigit '1' = True
isDigit '2' = True
isDigit '3' = True
isDigit '4' = True
isDigit '5' = True
isDigit '6' = True
isDigit '7' = True
isDigit '8' = True
isDigit '9' = True
isDigit _ = False
isName :: String -> Bool
isName s = foldr (&&) True $ map ((==) '"') $ [head s, last s]
scan :: String -> String
scan s = if (s == "absTerm" ||
s == "absThm" ||
s == "appTerm" ||
s == "appThm" ||
s == "assume" ||
s == "axiom" ||
s == "betaConv" ||
s == "cons" ||
s == "const" ||
s == "constTerm" ||
s == "deductAntisym" ||
s == "def" ||
s == "defineConst" ||
s == "defineTypeOp" ||
s == "eqMp" ||
s == "nil" ||
s == "opType" ||
s == "pop" ||
s == "ref" ||
s == "refl" ||
s == "remove" ||
s == "subst" ||
s == "thm" ||
s == "typeOp" ||
s == "var" ||
s == "varTerm" ||
s == "varType" ||
isComment(s) ||
isNumber(s) ||
isName(s))
then s
else error $ "Invalid input " ++ s
doScan :: [String] -> [String]
doScan = map (scan . stripReturn)
main = do
args <- getArgs
list <- getLines $ head args
plist <- return $ doScan list
printf $ if (list == plist) then "Scan OK\n" else "Syntax error\n"
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