Intial checkin of layout test analyzer.

media/tools/layout_tests/test_expectations_history.py

Index: media/tools/layout_tests/test_expectations_history.py
diff --git a/media/tools/layout_tests/test_expectations_history.py b/media/tools/layout_tests/test_expectations_history.py
new file mode 100644
index 0000000000000000000000000000000000000000..05c51a757d8853454e7c17f2f57e95f644f79e8f
--- /dev/null
+++ b/media/tools/layout_tests/test_expectations_history.py
@@ -0,0 +1,102 @@
+#!/usr/bin/python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""A Module for the history of the test expectation file."""
+
+import pysvn
+import re
+import time
+
+from datetime import datetime
+from datetime import timedelta
+# Default Webkit SVN location for chromium test expectation file.
+# TODO(imasaki): support multiple test expectations files.
+DEFAULT_TEST_EXPECTATION_LOCATION = (
+    'http://svn.webkit.org/repository/webkit/trunk/'
+    'LayoutTests/platform/chromium/test_expectations.txt')
+
+
+class TestExpectationsHistory:
+  """A class to represent history of the test expectation file.
+
+  The history is obtained by calling PySVN.log()/diff() APIs.
+
+  TODO(imasaki):  Add more functionalities here like getting some statistics
+      about the test expectation file.
+  """
+
+  @staticmethod
+  def GetDiffBetweenTimes(start, end, testname_list,
+                          te_location=DEFAULT_TEST_EXPECTATION_LOCATION):
+    """Get difference between time peroid for the specified testnames.
+
+    Given the time period, this method first gets the revision number. Then,
+    it gets the diff for each revision. Finally, it keeps the diff relating to
+    the testnames and returns them along with other information about revision.
+
+    Args:
+      start: A float time specifying start of the time period to be
+          looked at.
+      end: A float time object specifying end of the time period to be
+          looked at.
+      testname_list : A list of the test name string that you are interested
+          in.
+      te_location: A location of the test expectation file.
+
+    Returns:
+      A list of tuples (old_rev, new_rev, author, date, message, lines). The
+          |lines| contains the diff of the tests that I am interested in.
+    """
+    # Get directory name which is necesary to call PySVN.checout().
+    te_location_dir = te_location[0:te_location.rindex('/')]
+    client = pysvn.Client()
+    client.checkout(te_location_dir, 'tmp', recurse=False)
+    logs = client.log('tmp/test_expectations.txt',
+                      revision_start=pysvn.Revision(
+                          pysvn.opt_revision_kind.date, start),
+                      revision_end=pysvn.Revision(
+                          pysvn.opt_revision_kind.date, end))
+    result_list = []
+    # Find the last revision (outside of time time period) and
+    # append it to preserve the last change before entering the time period.
+    # I am using 1 day back as start (called start2)
+    start2 = time.mktime(
+        (datetime.fromtimestamp(start) - timedelta(days=1)).timetuple())
+    logs2 = client.log('tmp/test_expectations.txt',
+                      revision_start=pysvn.Revision(
+                          pysvn.opt_revision_kind.date, start2),
+                      revision_end=pysvn.Revision(
+                          pysvn.opt_revision_kind.date, start))
+    if len(logs2) > 0:
+        logs.append(logs2[len(logs2)-2])
+    for i in xrange(len(logs)-1):
+        # PySVN.log() returns logs in reverse chronological order.
+        new_rev = logs[i].revision.number
+        old_rev = logs[i + 1].revision.number
+        # Getting information about new revision.
+        author = logs[i].author
+        date = logs[i].date
+        message = logs[i].message
+        # Parsing the actual diff.
+        text = client.diff('/tmp', 'tmp/test_expectations.txt',
+                           revision1=pysvn.Revision(
+                               pysvn.opt_revision_kind.number, old_rev),
+                           revision2=pysvn.Revision(
+                               pysvn.opt_revision_kind.number, new_rev))
+        lines = text.split('\n')
+        target_lines = []
+        for line in lines:
+          for testname in testname_list:
+            matches = re.findall(testname, line)
+            if matches:
+              if line[0] == '+' or line[0] == '-':
+                target_lines.append(line)
+        if len(target_lines) > 0:
+          result_list.append((
+              old_rev, new_rev, author,
+              # Needs to convert to normal date string for presentation.
+              datetime.fromtimestamp(date).strftime("%Y-%m-%d %H:%M:%S"),
+              message, target_lines))
+    return result_list