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import System( getArgs )
import Text.Printf
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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