unambiguous array indices make pointers comparable

README.md

@@ -5,7 +5,7 @@ Resolve JSON Pointers in Python
 -------------------------------
 
 Library to resolve JSON Pointers according to
-http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer-04
+http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer-08
 
 See Sourcecode for Examples
 * Website: https://github.com/stefankoegl/python-json-pointer

jsonpointer.py

@@ -30,9 +30,9 @@
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
-""" Identify specific nodes in a JSON document (according to draft 07) """
+""" Identify specific nodes in a JSON document (according to draft 08) """
 
-# http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer-07
+# http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer-08
 
 # Will be parsed by setup.py to determine package metadata
 __author__ = 'Stefan Kögl <stefan@skoegl.net>'
@@ -205,6 +205,23 @@ class JsonPointer(object):
              self.parts[:len(ptr.parts)] == ptr.parts
 
 
+    def __eq__(self, other):
+        """ compares a pointer to another object
+
+        Pointers can be compared by comparing their strings (or splitted
+        strings), because no two different parts can point to the same
+        structure in an object (eg no different number representations) """
+
+        if not isinstance(other, JsonPointer):
+            return False
+
+        return self.parts == other.parts
+
+
+    def __hash__(self):
+        return hash(tuple(self.parts))
+
+
 def pairwise(iterable):
     "s -> (s0,s1), (s1,s2), (s2, s3), ..."
     a, b = tee(iterable)

tests.py

@@ -4,7 +4,8 @@
 import doctest
 import unittest
 import sys
-from jsonpointer import resolve_pointer, EndOfList, JsonPointerException
+from jsonpointer import resolve_pointer, EndOfList, JsonPointerException, \
+         JsonPointer
 
 class SpecificationTests(unittest.TestCase):
     """ Tests all examples from the JSON Pointer specification """
@@ -46,12 +47,30 @@ class SpecificationTests(unittest.TestCase):
         self.assertRaises(JsonPointerException, resolve_pointer, doc, "/foo/-/1")
 
 
+class ComparisonTests(unittest.TestCase):
+
+   def test_eq_hash(self):
+        p1 = JsonPointer("/something/1/b")
+        p2 = JsonPointer("/something/1/b")
+        p3 = JsonPointer("/something/1.0/b")
+
+        self.assertEqual(p1, p2)
+        self.assertNotEqual(p1, p3)
+        self.assertNotEqual(p2, p3)
+
+        self.assertEqual(hash(p1), hash(p2))
+        self.assertNotEqual(hash(p1), hash(p3))
+        self.assertNotEqual(hash(p2), hash(p3))
+
+
+
 
 modules = ['jsonpointer']
 coverage_modules = []
 
 suite = unittest.TestSuite()
 suite.addTest(unittest.makeSuite(SpecificationTests))
+suite.addTest(unittest.makeSuite(ComparisonTests))
 
 for module in modules:
     m = __import__(module, fromlist=[module])