Fix non-comment encoding detection.

--HG--
branch : fix_source_encoding

2 files changed, 6 insertions, 1 deletions

diff --git a/coverage/phystokens.py b/coverage/phystokens.py
index e79ce01f..867388f7 100644
--- a/coverage/phystokens.py
+++ b/coverage/phystokens.py
@@ -120,7 +120,7 @@ def source_encoding(source):
 
     # This is mostly code adapted from Py3.2's tokenize module.
 
-    cookie_re = re.compile(r"coding[:=]\s*([-\w.]+)")
+    cookie_re = re.compile(r"^\s*#.*coding[:=]\s*([-\w.]+)")
 
     # Do this so the detect_encode code we copied will work.
     readline = iter(source.splitlines(True)).next
diff --git a/tests/test_phystokens.py b/tests/test_phystokens.py
index e15400b6..4755c167 100644
--- a/tests/test_phystokens.py
+++ b/tests/test_phystokens.py
@@ -97,6 +97,11 @@ if sys.version_info < (3, 0):
             source = "# This Python file uses this encoding: utf-8\n"
             self.assertEqual(source_encoding(source), 'utf-8')
 
+        def test_detect_source_encoding_not_in_comment(self):
+            # Should not detect anything here
+            source = 'def parse(src, encoding=None):\n    pass'
+            self.assertEqual(source_encoding(source), 'ascii')
+
         def test_detect_source_encoding_on_second_line(self):
             # A coding declaration should be found despite a first blank line.
             source = "\n# coding=cp850\n\n"