Make toInt.py shorter and safer

TelegramBot/toInt.py

@@ -1,33 +1,11 @@
 
-Eval,Abs,Pow = eval,abs,pow
+    # use ast to prevent evil stuff
+from ast import literal_eval
 
-    # separate file to prevent the usage
-    # of unwanted eval features
-from math import *
-
-    # Lambert W-function (why?! XD)
-    # inverted function to f(x)=x*e^x
-def W(x):
-        # y-result, d-10-exponent, s-y*e^y, t-previous s
-    y,d,s,t = 0,-2,0,-1
-        # relation of s to x
-    f = r = 1 if y*Pow(e,y)<x else -1
-
-    while d<17:                 # python calculates with 16 float digits
-        while r==f:             # if relation of s to x changed - calc next digit
-            if s==t:return y    # return if y*e^y == result
-            t = s
-            if Abs(y) > 10000:return "NaN"    # x not in W(x)
-            y += f*Pow(10, -d)      # in/decrease a digit dependent on f
-            s = y*Pow(e, y)         # calculate x of current y value
-            f = 1 if s < x else -1  # recalculate relation of s to x
-
-        r, d = f, d+1
-    return y
-
-    # calculate int from string via eval
+    # calculate int from string via literal_eval
 def toInt(s):
-    try: return Eval(s)
+        # convert to lower case to allow things like "Abs" or "SQRT"
+    try: return ast.literal_eval(s.lower())
     except ZeroDivisionError:
-        return 'division by zero!'
+        return 'Division by 0!'
     except: return 'Error!'