gst/__init__.py: Implement multiplication, divison and float coercing for fractions.

Original commit message from CVS:

* gst/__init__.py: Implement multiplication, divison and float
coercing for fractions.

* testsuite/test_fraction.py:
Add fraction tests

ChangeLog

@@ -1,9 +1,19 @@
+2007-03-18  Johan Dahlin  <jdahlin@async.com.br>
+
+	reviewed by: Edward Hervey  <edward@fluendo.com>
+
+	* gst/__init__.py: Implement multiplication, divison and float 
+	coercing for fractions.
+
+	* testsuite/test_fraction.py: 
+	Add fraction tests
+
 2007-03-17  Johan Dahlin  <jdahlin@async.com.br>
 
 	* gst/gsttaglist.override (_wrap_gst_tag_list_contains): 
 	* testsuite/test_taglist.py (TestTagList.testKeys): 
 
-	Implement sq_contains and add tests for TagList.
+	Implement sq_contains and add tests for gst.TagList.
 
 2007-03-02  Edward Hervey  <edward@fluendo.com>
 

gst/__init__.py

@@ -76,17 +76,48 @@ class FractionRange(Value):
                                                      self.high.denom)
 
 class Fraction(Value):
-   def __init__(self, num, denom):
+    def __init__(self, num, denom=1):
-      Value.__init__(self, 'fraction')
+        Value.__init__(self, 'fraction')
-      self.num = num
+        self.num = num
-      self.denom = denom
+        self.denom = denom
-   def __eq__(self, other):
+
-       if isinstance(other, Fraction):
+    def __repr__(self):
-           return self.num * other.denom == other.num * self.denom
+        return '<gst.Fraction %d/%d>' % (self.num, self.denom)
-       return False
+
-       
+    def __eq__(self, other):
-   def __repr__(self):
+        if isinstance(other, Fraction):
-      return '<gst.Fraction %d/%d>' % (self.num, self.denom)
+            return self.num * other.denom == other.num * self.denom
+        return False
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __mul__(self, other):
+        if isinstance(other, Fraction):
+            return Fraction(self.num * other.num,
+                            self.denom * other.denom)
+        elif isinstance(other, int):
+            return Fraction(self.num * other, self.denom)
+        raise TypeError
+
+    __rmul__ = __mul__
+
+    def __div__(self, other):
+        if isinstance(other, Fraction):
+            return Fraction(self.num * other.denom,
+                            self.denom * other.num)
+        elif isinstance(other, int):
+            return Fraction(self.num, self.denom * other)
+        return TypeError
+
+    def __rdiv__(self, other):
+        if isinstance(other, int):
+            return Fraction(self.denom * other, self.num)
+        return TypeError
+
+    def __float__(self):
+        return float(self.num) / float(self.denom)
+
 
 import sys
 dlsave = sys.getdlopenflags()
@@ -116,7 +147,7 @@ if RTLD_GLOBAL != -1 and RTLD_LAZY != -1:
         import libxml2
     except:
         pass
-    
+
 version = get_gst_version
 
 sys.setdlopenflags(dlsave)

testsuite/test_fraction.py

@@ -0,0 +1,77 @@
+# -*- Mode: Python -*-
+# vi:si:et:sw=4:sts=4:ts=4
+#
+# gst-python - Python bindings for GStreamer
+# Copyright (C) 2007 Johan Dahlin
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+
+from common import gst, TestCase
+
+F = gst.Fraction
+
+class TestFraction(TestCase):
+    def testConstructor(self):
+        frac = F(1, 2)
+        self.assertEquals(frac.num, 1)
+        self.assertEquals(frac.denom, 2)
+
+        frac = F(1)
+        self.assertEquals(frac.num, 1)
+        self.assertEquals(frac.denom, 1)
+
+        self.assertRaises(TypeError, F)
+
+    def testRepr(self):
+        self.assertEquals(repr(F(1, 2)), '<gst.Fraction 1/2>')
+
+    def testEqNe(self):
+        frac = F(1, 2)
+        self.assertEquals(frac, frac)
+        self.assertEquals(F(1, 2), F(1, 2))
+        self.assertEquals(F(2, 4), F(1, 2))
+
+        self.assertNotEquals(F(1, 3), F(1, 2))
+        self.assertNotEquals(F(2, 1), F(1, 2))
+
+    def testMul(self):
+        self.assertEquals(F(1, 2) * F(1, 2), F(1, 4))
+        self.assertEquals(F(2, 3) * F(4, 5), F(8, 15))
+        self.assertEquals(F(1, 3) * F(4), F(4, 3))
+        self.assertEquals(F(1, 3) * 4, F(4, 3))
+
+    def testRMul(self):
+        self.assertEquals(2 * F(1, 2), F(1))
+        self.assertEquals(4 * F(1, 2), F(2))
+        self.assertEquals(-10 * F(1, 2), F(-5))
+
+    def testDiv(self):
+        self.assertEquals(F(1, 3) / F(1, 4), F(4, 3))
+        self.assertEquals(F(2, 3) / F(4, 5), F(10, 12))
+
+        self.assertEquals(F(1, 3) / F(4), F(1, 12))
+        self.assertEquals(F(1, 3) / 4, F(1, 12))
+        self.assertEquals(F(1, 3) / 2, F(1, 6))
+        self.assertEquals(F(1, 5) / -4, F(1, -20))
+
+    def testRDiv(self):
+        self.assertEquals(2 / F(1, 3), F(6, 1))
+        self.assertEquals(-4 / F(1, 5), F(-20, 1))
+
+    def testFloat(self):
+        self.assertEquals(float(F(1, 2)), 0.5)
+
+
+