--- a/tests/doctest.txt	Mon Jun 27 11:22:40 2011 -0700
+++ b/tests/doctest.txt	Tue Jun 28 18:39:18 2011 -0700
@@ -20,11 +20,14 @@
     >>> sorted(matcher.match('example')) # -> example.*
     ['http://www.example.com/foo/bar/fleem', 'http://www.example.com/foo/blah', 'https://www.example.com/foo/', 'https://www.example.net/foo/']
 
-Test decomposition::
+Test decomposition and recomposition::
    
     >>> matcher = UrlMatcher()
-    >>> sorted(matcher.decompose('http://www.example.com/foo').items())
+    >>> decomposed = matcher.decompose('http://www.example.com/foo')
+    >>> sorted(decomposed.items())
     [('domain', ['example', 'com', 'www']), ('path', ['foo']), ('scheme', 'http')]
+    >>> matcher.recompose(decomposed)
+    'http://www.example.com/foo'
 
 Test url diffs::
 

--- a/urlmatch.py	Mon Jun 27 11:22:40 2011 -0700
+++ b/urlmatch.py	Tue Jun 28 18:39:18 2011 -0700
@@ -39,6 +39,31 @@
 
         return urldict
 
+    @classmethod
+    def recompose(cls, url):
+        """reconstruct a deconstructed url"""
+
+        # must have a domain
+        assert 'domain' in url
+        assert url['domain'] 
+
+        # reconstruct domain
+        if len(url['domain']) == 1:
+            return url['domain'][0] # what else to do?
+        retval = '%s.%s' % tuple(url['domain'][:2])
+        if len(url['domain']) > 2:
+            retval = '.'.join(reversed(url['domain'][2:])) + '.' + retval
+
+        # add the scheme
+        if 'scheme' in url:
+            retval = url['scheme'] + '://' + retval
+
+        # add the path
+        if 'path' in url:
+            retval += '/' + '/'.join(url['path'])
+
+        return retval
+
     def add(self, url):
         if url not in self.urls:
             self.urls[url] = self.decompose(url)