[gobject-introspection] Fix enum prefix stripping to work only up to word boundaries

[Dan Winship <danw src gnome org>]

commit ab127091d84336a851e0cec9cfdd0435065d9e2a
Author: Dan Winship <danw gnome org>
Date:   Mon Nov 23 10:52:09 2009 -0500

    Fix enum prefix stripping to work only up to word boundaries
    
    https://bugzilla.gnome.org/show_bug.cgi?id=602672

 giscanner/transformer.py            |   16 +++++++---------
 tests/scanner/foo-1.0-expected.gir  |    5 +++++
 tests/scanner/foo-1.0-expected.tgir |    5 +++++
 tests/scanner/foo.h                 |    7 +++++++
 4 files changed, 24 insertions(+), 9 deletions(-)
---
diff --git a/giscanner/transformer.py b/giscanner/transformer.py
index 86a2114..a131e3c 100644
--- a/giscanner/transformer.py
+++ b/giscanner/transformer.py
@@ -214,15 +214,13 @@ class Transformer(object):
 
     def _enum_common_prefix(self, symbol):
         def common_prefix(a, b):
-            alen = len(a)
-            blen = len(b)
-            l = min(alen, blen)
-            for i in xrange(l):
-                if a[i] != b[i]:
-                    return a[:i]
-            if alen > blen:
-                return b
-            return a
+            commonparts = []
+            for aword, bword in zip(a.split('_'), b.split('_')):
+                if aword != bword:
+                    return '_'.join(commonparts) + '_'
+                commonparts.append(aword)
+            return min(a, b)
+
         # Nothing less than 2 has a common prefix
         if len(list(symbol.base_type.child_list)) < 2:
             return None
diff --git a/tests/scanner/foo-1.0-expected.gir b/tests/scanner/foo-1.0-expected.gir
index 85c2322..fa3d73c 100644
--- a/tests/scanner/foo-1.0-expected.gir
+++ b/tests/scanner/foo-1.0-expected.gir
@@ -23,6 +23,11 @@ and/or use gtk-doc annotations.  -->
               value="0"
               c:identifier="FOO_SOME_SINGLE_ENUM"/>
     </enumeration>
+    <enumeration name="AddressType" c:type="FooAddressType">
+      <member name="invalid" value="0" c:identifier="FOO_ADDRESS_INVALID"/>
+      <member name="ipv4" value="1" c:identifier="FOO_ADDRESS_IPV4"/>
+      <member name="ipv6" value="2" c:identifier="FOO_ADDRESS_IPV6"/>
+    </enumeration>
     <record name="BRect"
             c:type="FooBRect"
             glib:type-name="FooBRect"
diff --git a/tests/scanner/foo-1.0-expected.tgir b/tests/scanner/foo-1.0-expected.tgir
index 8504bc4..bcba5a2 100644
--- a/tests/scanner/foo-1.0-expected.tgir
+++ b/tests/scanner/foo-1.0-expected.tgir
@@ -10,6 +10,11 @@
     <enumeration name="ASingle">
       <member name="some_single_enum" value="0"/>
     </enumeration>
+    <enumeration name="AddressType">
+      <member name="invalid" value="0"/>
+      <member name="ipv4" value="1"/>
+      <member name="ipv6" value="2"/>
+    </enumeration>
     <record name="BRect" glib:type-name="FooBRect" glib:get-type="foo_brect_get_type">
       <field name="x" writable="1">
         <type name="double"/>
diff --git a/tests/scanner/foo.h b/tests/scanner/foo.h
index 7c2afe6..199d57a 100644
--- a/tests/scanner/foo.h
+++ b/tests/scanner/foo.h
@@ -188,6 +188,13 @@ typedef enum
   FOO_ENUM_FULLNAME_THREE
 } FooEnumFullname;
 
+typedef enum
+{
+  FOO_ADDRESS_INVALID,
+  FOO_ADDRESS_IPV4,
+  FOO_ADDRESS_IPV6
+} FooAddressType;
+
 typedef struct _FooBoxed FooBoxed;
 
 GType                 foo_boxed_get_type       (void) G_GNUC_CONST;