Improve errors

main.py

@@ -2,16 +2,22 @@ from Tokenizer import tokenize
 from Parser import parse
 from Evaluator import evaluate
 from Environment import createEnvironment
+from Error import SyntaxException, RuntimeException
 import sys
 
 if __name__ == "__main__":
-    with open(sys.argv[1], 'r') as source:
-        lines = [line.rstrip('\n') for line in source.readlines()]
-    
-    env = createEnvironment()
-    
-    tokens = tokenize(lines)
-    
-    ast = parse(tokens)
-    
-    evaluate(ast, env)
+    try:
+        with open(sys.argv[1], 'r') as source:
+            lines = [line.rstrip('\n') for line in source.readlines()]
+        
+        env = createEnvironment()
+        
+        tokens = tokenize(lines)
+        
+        ast = parse(tokens)
+        
+        evaluate(ast, env)
+    except SyntaxException as e:
+        print(e.msg)
+    except RuntimeException as e:
+        print(e.msg)