Initial source

1 files changed, 87 insertions, 0 deletions

diff --git a/Syntactic.hs b/Syntactic.hs
new file mode 100644
index 0000000..0abff0f
--- /dev/null
+++ b/Syntactic.hs
@@ -0,0 +1,87 @@
+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"
+