Added logic module

1 files changed, 46 insertions, 0 deletions

diff --git a/fracciones.activity/fractionlogic.py b/fracciones.activity/fractionlogic.py
new file mode 100644
index 0000000..6c1fcf0
--- /dev/null
+++ b/fracciones.activity/fractionlogic.py
@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+"""
+Contain the logic of fractions and comparations of fractions.
+
+"""
+import random
+DENOMINATOR_MIN = 4
+DENOMINATOR_MAX = 10
+
+
+class FractionLogic(object):
+    
+    def __init__(self):
+        self.numerator = None
+        self.denominator = None
+
+
+    def generate(self):
+        """Generate new fraction"""
+        if DENOMINATOR_MIN < 1:
+            raise Exception("DENOMINATOR_MIN need be greather than 0")
+        self.denominator = random.randrange(DENOMINATOR_MIN, DENOMINATOR_MAX)
+        self.numerator = random.randrange(0, self.denominator)
+
+
+    def get_current(self):
+        """Return the current fraction, raise an exception if generate_fraction
+        hasn't called before"""
+        if self.denominator is None:
+            raise Exception("generate_fraction must be called before get_current_fraction")
+        return (self.numerator, self.denominator)
+
+
+    def is_equal(self, fraction):
+        """Check if fraction is equal that the internal"""
+        if not(type(fraction) is tuple and len(fraction) == 2):
+            raise Exception("fraction must be a tuple of length 2")
+        if self.denominator is None:
+            raise Exception("generate_fraction must be called before is_equal")
+        return fraction[0] * self.denominator == fraction[1] * self.numerator
+
+
+    def __repr__(self):
+        if self.denominator is None:
+            return "<FractionLogic(Undefined)>"
+        return "<FractionLogic(%i,%i)>"%(self.numerator,self.denominator)