style: Fix Python 2.6 compatibility

The style checker code needs to disable autojunk when diffing source
files using Python's difflib. Support for this was only introduced in
Python 2.7, which leads to a TypeError exception on older Python
version. This changeset adds a fallback mechanism for old Python
versions.

diff --git a/util/style/verifiers.py b/util/style/verifiers.py
index 7650d307169df236efed4689df1c52dc84aa41da..a55f5edd8b762f0648cf2ce07fefdd1c0c0038c6 100644 (file)
--- a/util/style/verifiers.py
+++ b/util/style/verifiers.py
@@ -57,8 +57,12 @@ from region import *
 from file_types import lang_type
 
 def _modified_regions(old, new):
-    m = SequenceMatcher(a=old, b=new, autojunk=False)
-
+    try:
+        m = SequenceMatcher(a=old, b=new, autojunk=False)
+    except TypeError:
+        # autojunk was introduced in Python 2.7. We need a fallback
+        # mechanism to support old Python versions.
+        m = SequenceMatcher(a=old, b=new)
     regions = Regions()
     for tag, i1, i2, j1, j2 in m.get_opcodes():
         if tag != "equal":