[gobject-introspection] giscanner: Update namespace sort for Python 3 compatibility

[Colin Walters <walters src gnome org>]

commit c6aba9366a31eda73c6f3f07893bf9603374782d
Author: Simon Feltman <sfeltman src gnome org>
Date:   Mon Apr 28 20:38:18 2014 -0700

    giscanner: Update namespace sort for Python 3 compatibility
    
    Use key function instead of cmp for list.sort which is compatible
    with both Python 2 and 3. Make sure a list is returned from split
    function. Don't use identity comparison "is" on strings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679438

 giscanner/transformer.py |   17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)
---
diff --git a/giscanner/transformer.py b/giscanner/transformer.py
index 968db75..d1fddaf 100644
--- a/giscanner/transformer.py
+++ b/giscanner/transformer.py
@@ -244,12 +244,15 @@ currently-scanned namespace is first."""
         for ns in self._parsed_includes.values():
             yield ns
 
-    def _sort_matches(self, x, y):
-        if x[0] is self._namespace:
-            return 1
-        elif y[0] is self._namespace:
-            return -1
-        return cmp(x[2], y[2])
+    def _sort_matches(self, val):
+        """Key sort which ensures items in self._namespace are last by returning
+        a tuple key starting with 1 for self._namespace entries and 0 for
+        everythin else.
+        """
+        if val[0] == self._namespace:
+            return 1, val[2]
+        else:
+            return 0, val[2]
 
     def _split_c_string_for_namespace_matches(self, name, is_identifier=False):
         if not is_identifier and self._symbol_filter_cmd:
@@ -283,7 +286,7 @@ currently-scanned namespace is first."""
             else:
                 unprefixed_namespaces.append(ns)
         if matches:
-            matches.sort(self._sort_matches)
+            matches.sort(key=self._sort_matches)
             return list(map(lambda x: (x[0], x[1]), matches))
         elif self._accept_unprefixed:
             return [(self._namespace, name)]