Overload operators for MOnumbers in order to use gcd

mapytex/calculus/core/compute/__init__.py

@@ -14,11 +14,13 @@ from .exceptions import ComputeError
 from .add import add
 from .minus import minus
 from .multiply import multiply
+from .divide import divide
 
 OPERATIONS = {
         "+": add, 
         "-": minus, 
         "*": multiply,
+        "/": divide,
         }
 
 def compute(node, left_v, right_v):

mapytex/calculus/core/compute/arithmetic.py

@@ -24,10 +24,15 @@ def gcd(a, b):
     2
 
     """
-    pos_a, _a = (a >= 0), abs(a)
-    pos_b, _b = (b >= 0), abs(b)
+    try:
+        pos_a, _a = (a >= 0), abs(a)
+        pos_b, _b = (b >= 0), abs(b)
 
-    gcd_sgn = (-1 + 2 * (pos_a or pos_b))
+        gcd_sgn = (-1 + 2 * (pos_a or pos_b))
+    except TypeError:
+        _a = a
+        _b = b
+        gcd_sgn = 1
 
     if _a > _b:
         c = _a % _b