Intial checkin of layout test analyzer.

media/tools/layout_tests/test_expectations_history.py

+#!/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 re
+import time
+import pysvn
+
+from datetime import datetime
+from datetime import timedelta
+
+# Default Webkit SVN location for chromium test expectation file.
+# TODO(imasaki): support multiple test expectation 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 period for the specified test names.
+
+    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 test names and returns them along with other information about
+    revision.
+
+    Args:
+      start: A timestamp specifying start of the time period to be
+          looked at.
+      end: A timestamp object specifying end of the time period to be
+          looked at.
+      testname_list: A list of strings representing test names of interest.
+      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 of interest.
+    """
+    # Get directory name which is necesary to call PySVN.checkout().
+    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 period and
+    # append it to preserve the last change before entering the time period.
+    gobackdays = 1
+    while True:
+      start2 = time.mktime(
+          (datetime.fromtimestamp(start) - (
+              timedelta(days=gobackdays))).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 logs2:
+        logs.append(logs2[len(logs2) - 2])
+        break
+      gobackdays *= 2

[dennis_jeffrey, 2011/08/27 00:04:50]

(optional) Maybe have some maximum value for 'gobackdays', and if the value
exceeds that maximum threshold, then you can issue an error and terminate the
script?  That would prevent some kind of "infinite" loop here.

[imasaki1, 2011/08/29 21:32:49]

Done.

+
+    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
+      # 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 target_lines:
+        # Needs to convert to normal date string for presentation.
+        result_list.append((
+            old_rev, new_rev, logs[i].author,
+            datetime.fromtimestamp(logs[i].date).strftime('%Y-%m-%d %H:%M:%S'),
+            logs[i].message, target_lines))
+    return result_list