[Findit] Add local git parsers.

appengine/findit/common/git_repository.py

 # Copyright 2014 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.
 
 import base64
 from datetime import datetime
 from datetime import timedelta
 import json
 import re
 
 from common import diff
 from common import http_client_appengine
+from common import repo_util
 from common.blame import Blame
 from common.blame import Region
 from common.cache_decorator import Cached
 from common.cache_decorator import CompressedMemCacher
 from common.change_log import ChangeLog
 from common.change_log import FileChangeInfo
 from common.repository import Repository
 
-
-COMMIT_POSITION_PATTERN = re.compile(
-    '^Cr-Commit-Position: refs/heads/master@{#(\d+)}$', re.IGNORECASE)
-CODE_REVIEW_URL_PATTERN = re.compile(
-    '^(?:Review URL|Review-Url): (.*\d+).*$', re.IGNORECASE)
-REVERTED_REVISION_PATTERN = re.compile(
-    '^> Committed: https://.+/([0-9a-fA-F]{40})$', re.IGNORECASE)
 TIMEZONE_PATTERN = re.compile('[-+]\d{4}$')
 CACHE_EXPIRE_TIME_SECONDS = 24 * 60 * 60
 
 
 class GitRepository(Repository):
   """Represents a git repository on https://chromium.googlesource.com."""
 
   def __init__(self, repo_url=None, http_client=None):
     super(GitRepository, self).__init__()
     self.repo_url = repo_url
@@ skipping 24 matching lines @@
 
     return json.loads(content[len(prefix):])
 
   @Cached(namespace='Gitiles-text-view', expire_time=CACHE_EXPIRE_TIME_SECONDS)
   def _SendRequestForTextResponse(self, url):
     status_code, content = self.http_client.Get(url, {'format': 'text'})
     if status_code != 200:
       return None
     return base64.b64decode(content)
 
-  def ExtractCommitPositionAndCodeReviewUrl(self, message):
-    """Returns the commit position and code review url in the commit message.
-
-    A "commit position" is something similar to SVN version ids; i.e.,
-    numeric identifiers which are issued in sequential order. The reason
-    we care about them is that they're easier for humans to read than
-    the hashes that Git uses internally for identifying commits. We
-    should never actually use them for *identifying* commits; they're
-    only for pretty printing to humans.
-
-    Returns:
-      (commit_position, code_review_url)
-    """
-    if not message:
-      return (None, None)
-
-    commit_position = None
-    code_review_url = None
-
-    # Commit position and code review url are in the last 5 lines.
-    lines = message.strip().split('\n')[-5:]
-    lines.reverse()
-
-    for line in lines:
-      if commit_position is None:
-        match = COMMIT_POSITION_PATTERN.match(line)
-        if match:
-          commit_position = int(match.group(1))
-
-      if code_review_url is None:
-        match = CODE_REVIEW_URL_PATTERN.match(line)
-        if match:
-          code_review_url = match.group(1)
-    return (commit_position, code_review_url)
-
-  def _NormalizeEmail(self, email):
-    """Normalizes the email from git repo.
-
-    Some email is like: test@chromium.org@bbb929c8-8fbe-4397-9dbb-9b2b20218538.
-    """
-    parts = email.split('@')
-    return '@'.join(parts[0:2])
-
   def _GetDateTimeFromString(self, datetime_string,
                              date_format='%a %b %d %H:%M:%S %Y'):
     if TIMEZONE_PATTERN.findall(datetime_string):
       # Need to handle timezone conversion.
       naive_datetime_str, _, offset_str = datetime_string.rpartition(' ')
       naive_datetime = datetime.strptime(naive_datetime_str,
                                          date_format)
       hour_offset = int(offset_str[-4:-2])
       minute_offset = int(offset_str[-2:])
       if(offset_str[0]) == '-':
         hour_offset = -hour_offset
         minute_offset = -minute_offset
 
       time_delta = timedelta(hours=hour_offset, minutes=minute_offset)
 
       utc_datetime = naive_datetime - time_delta
       return utc_datetime
 
     return datetime.strptime(datetime_string, date_format)
 
   def _DownloadChangeLogData(self, revision):
     url = '%s/+/%s' % (self.repo_url, revision)
     return url, self._SendRequestForJsonResponse(url)
 
-  def GetRevertedRevision(self, message):
-    """Parse message to get the reverted revision if there is one."""
-    lines = message.strip().splitlines()
-    if not lines[0].lower().startswith('revert'):
-      return None
-
-    for line in reversed(lines):  # pragma: no cover
-      # TODO: Handle cases where no reverted_revision in reverting message.
-      reverted_revision_match = REVERTED_REVISION_PATTERN.match(line)
-      if reverted_revision_match:
-        return reverted_revision_match.group(1)
-
   def _ParseChangeLogFromLogData(self, data):
     commit_position, code_review_url = (
-        self.ExtractCommitPositionAndCodeReviewUrl(data['message']))
+        repo_util.ExtractCommitPositionAndCodeReviewUrl(data['message']))
 
     touched_files = []
     for file_diff in data['tree_diff']:
       change_type = file_diff['type'].lower()
       if not diff.IsKnownChangeType(change_type):
         raise Exception('Unknown change type "%s"' % change_type)
       touched_files.append(
           FileChangeInfo(
               change_type, file_diff['old_path'], file_diff['new_path']))
 
     author_time = self._GetDateTimeFromString(data['author']['time'])
     committer_time = self._GetDateTimeFromString(data['committer']['time'])
-    reverted_revision = self.GetRevertedRevision(data['message'])
+    reverted_revision = repo_util.GetRevertedRevision(data['message'])
     url = '%s/+/%s' % (self.repo_url, data['commit'])
 
     return ChangeLog(
-        data['author']['name'], self._NormalizeEmail(data['author']['email']),
+        data['author']['name'],
+        repo_util.NormalizeEmail(data['author']['email']),
         author_time,
         data['committer']['name'],
-        self._NormalizeEmail(data['committer']['email']),
+        repo_util.NormalizeEmail(data['committer']['email']),
         committer_time, data['commit'], commit_position,
         data['message'], touched_files, url, code_review_url,
         reverted_revision)
 
   def GetChangeLog(self, revision):
     """Returns the change log of the given revision."""
     _, data = self._DownloadChangeLogData(revision)
     if not data:
       return None
 
@@ skipping 47 matching lines @@
       return None
 
     blame = Blame(revision, path)
     for region in data['regions']:
       author_time = self._GetDateTimeFromString(
           region['author']['time'], '%Y-%m-%d %H:%M:%S')
 
       blame.AddRegion(
           Region(region['start'], region['count'], region['commit'],
                  region['author']['name'],
-                 self._NormalizeEmail(region['author']['email']), author_time))
+                 repo_util.NormalizeEmail(region['author']['email']),
+                 author_time))
 
     return blame
 
   def GetSource(self, path, revision):
     """Returns source code of the file at ``path`` of the given revision."""
     url = '%s/+/%s/%s' % (self.repo_url, revision, path)
     return self._SendRequestForTextResponse(url)
 
   def GetChangeLogs(self, start_revision, end_revision, n=1000):
     """Gets a list of ChangeLogs in revision range by batch.
@@ skipping 18 matching lines @@
 
       for log in data['log']:
         changelogs.append(self._ParseChangeLogFromLogData(log))
 
       if 'next' in data:
         next_end_revision = data['next']
       else:
         next_end_revision = None
 
     return changelogs