diff --git a/Tools/ChangeLog b/Tools/ChangeLog
index 9db76ae..963217c 100644
--- a/Tools/ChangeLog
+++ b/Tools/ChangeLog
@@ -1,3 +1,64 @@
+2019-10-14  Jonathan Bedard  <jbedard@apple.com>
+
+        Python 3: Add support in webkitpy.common.net.bugzilla
+        https://bugs.webkit.org/show_bug.cgi?id=202465
+
+        Reviewed by Dewei Zhu.
+
+        * Scripts/test-webkitpy-python3: Add webkitpy.common.net.bugzilla to the test list.
+        * Scripts/webkitpy/common/net/bugzilla/__init__.py: Use full import paths.
+        * Scripts/webkitpy/common/net/bugzilla/attachment_unittest.py: Ditto.
+        * Scripts/webkitpy/common/net/bugzilla/bug.py: Ditto.
+        (Bug.commit_revision): Dictionary sorting is no longer well defined in Python 3.
+        * Scripts/webkitpy/common/net/bugzilla/bug_unittest.py: Use full import paths.
+        * Scripts/webkitpy/common/net/bugzilla/bugzilla.py: Ditto.
+        (EditUsersParser.login_userid_pairs_from_edit_user_results): Return list, not an iterator.
+        (EditUsersParser.user_dict_from_edit_user_page): HTML_ENTITIES is logically connected to BeautifulSoup, not
+        BeautifulStoneSoup. 
+        (BugzillaQueries._parse_attachment_ids_request_query): Explicitly cast date_tag to unicode.
+        (Bugzilla._parse_attachment_element): Legacy BeautifulSoup and bs4 Elements have different function calls.
+        (Bugzilla._file_object_for_upload): Use BytesIO instead of StringIO.
+        (Bugzilla.create_bug):
+        (reopen_bug): Access map as list, not iterator.
+        * Scripts/webkitpy/common/net/bugzilla/bugzilla_mock.py: Use full import paths.
+        * Scripts/webkitpy/common/net/bugzilla/bugzilla_unittest.py: Ditto.
+        * Scripts/webkitpy/common/net/bugzilla/test_expectation_updater.py:
+        (TestExpectationUpdater._update_from_generic_attachment): Use items over iteritems().
+        (TestExpectationUpdater._update_from_platform_specific_attachment): Ditto.
+        (TestExpectationUpdater.do_update): Ditto.
+        * Scripts/webkitpy/common/net/buildbot/buildbot.py: Use Python 2/3 compatible urllib.
+        * Scripts/webkitpy/common/net/credentials.py: Use import statement to force autoinstall logic.
+        * Scripts/webkitpy/common/net/file_uploader.py: Use Python 2/3 compatible urllib.
+        (FileUploader._upload_data.callback):
+        (FileUploader):
+        * Scripts/webkitpy/common/net/resultsjsonparser.py:
+        (JSONTestResult._tokenize): Force map() call to return a list.
+        * Scripts/webkitpy/common/net/web_mock.py: Use Python 2/3 compatible urllib.
+        * Scripts/webkitpy/common/system/autoinstall.py:
+        (AutoInstaller.install): Return True if install was required, otherwise, return False.
+        * Scripts/webkitpy/common/system/filesystem_mock.py:
+        (MockFileSystem.__init__): Encode strings before writing them to the filesystem.
+        * Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py: Use Python 2/3 compatible urllib.
+        * Scripts/webkitpy/layout_tests/models/test_expectations.py:
+        (TestExpectationParser): Use items over iteritems().
+        * Scripts/webkitpy/layout_tests/models/test_failures.py: Use Python 3 compatible Pickle library.
+        * Scripts/webkitpy/layout_tests/models/test_results.py: Ditto.
+        * Scripts/webkitpy/port/darwin_testcase.py:
+        (DarwinTest.test_crashlog_path): Use dictionary for files.
+        * Scripts/webkitpy/test/main.py:
+        (Tester._run_tests): Update directories excluded from testing.
+        * Scripts/webkitpy/thirdparty/BeautifulSoup.py: Replaced.
+        (BeautifulSoup):Wrapper class making bs4 BeautifulSoup compatible with legacy BeautifulSoup calls.
+        (BeautifulStoneSoup): Ditto.
+        * Scripts/webkitpy/thirdparty/BeautifulSoup_legacy.py: Copied from Tools/Scripts/webkitpy/thirdparty/BeautifulSoup.py.
+        * Scripts/webkitpy/thirdparty/__init__.py:
+        (AutoinstallImportHook.__init__): Accept executive.
+        (AutoinstallImportHook.find_module): Add beautifulsoup.
+        (AutoinstallImportHook._install_beautifulsoup): bs4 must be converted via 2to3 before use in Python 3.
+        (AutoinstallImportHook._install): Return result from installer.
+        * Scripts/webkitpy/thirdparty/mock.py:
+        (Mock.reset_mock): Use values() instead of itervalues().
+
 2019-10-14  Matt Mokary  <mmokary@apple.com>
 
         FindController::findString always updates foundStringMatchIndex even if match is the same as before
diff --git a/Tools/Scripts/test-webkitpy-python3 b/Tools/Scripts/test-webkitpy-python3
index ff497fa..eda3a82 100755
--- a/Tools/Scripts/test-webkitpy-python3
+++ b/Tools/Scripts/test-webkitpy-python3
@@ -34,6 +34,7 @@
 PYTHON3_COMPATIBLE_DIRECTORIES = [
   'webkitpy.common.system',
   'webkitpy.common.thread',
+  'webkitpy.common.net.bugzilla',
 ]
 
 
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/__init__.py b/Tools/Scripts/webkitpy/common/net/bugzilla/__init__.py
index c427b18..d28b712 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/__init__.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/__init__.py
@@ -1,7 +1,7 @@
 # Required for Python to search this directory for module files
 
 # We only export public API here.
-from .bugzilla import Bugzilla
+from webkitpy.common.net.bugzilla.bugzilla import Bugzilla
 # Unclear if Bug and Attachment need to be public classes.
-from .bug import Bug
-from .attachment import Attachment
+from webkitpy.common.net.bugzilla.bug import Bug
+from webkitpy.common.net.bugzilla.attachment import Attachment
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/attachment_unittest.py b/Tools/Scripts/webkitpy/common/net/bugzilla/attachment_unittest.py
index f259cfe..8be51f2 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/attachment_unittest.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/attachment_unittest.py
@@ -25,7 +25,7 @@
 from datetime import datetime
 from webkitpy.common.net.bugzilla.constants import BUGZILLA_DATE_FORMAT
 
-from .attachment import Attachment
+from webkitpy.common.net.bugzilla.attachment import Attachment
 
 
 class AttachmentTest(unittest.TestCase):
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/bug.py b/Tools/Scripts/webkitpy/common/net/bugzilla/bug.py
index 2cbcba4..d8e8cc1 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/bug.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/bug.py
@@ -30,7 +30,7 @@
 
 import re
 
-from .attachment import Attachment
+from webkitpy.common.net.bugzilla.attachment import Attachment
 
 
 class Bug(object):
@@ -133,7 +133,7 @@
     def commit_revision(self):
         # Sort the comments in reverse order as we want the latest committed revision.
         r = re.compile("Committed r(?P<svn_revision>\d+)")
-        for comment in sorted(self.comments(), reverse=True):
+        for comment in sorted(self.comments(), key=lambda comment: comment['text'], reverse=True):
             rev = r.search(comment['text'])
             if rev:
                 return int(rev.group('svn_revision'))
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/bug_unittest.py b/Tools/Scripts/webkitpy/common/net/bugzilla/bug_unittest.py
index 28a1d9a..9358bc0 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/bug_unittest.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/bug_unittest.py
@@ -28,7 +28,7 @@
 
 import unittest
 
-from .bug import Bug
+from webkitpy.common.net.bugzilla.bug import Bug
 
 
 class BugTest(unittest.TestCase):
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla.py b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla.py
index 85e1ed3..9237ac5 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla.py
@@ -34,14 +34,15 @@
 import logging
 import mimetypes
 import re
-import StringIO
 import socket
+import sys
 import urllib
 
 from datetime import datetime  # used in timestamp()
 
-from .attachment import Attachment
-from .bug import Bug
+from webkitpy.common.unicode_compatibility import BytesIO, StringIO, unicode
+from webkitpy.common.net.bugzilla.attachment import Attachment
+from webkitpy.common.net.bugzilla.bug import Bug
 
 from webkitpy.common.config import committers
 import webkitpy.common.config.urls as config_urls
@@ -73,11 +74,11 @@
         return (login, user_id)
 
     def login_userid_pairs_from_edit_user_results(self, results_page):
-        soup = BeautifulSoup(results_page, convertEntities=BeautifulStoneSoup.HTML_ENTITIES)
+        soup = BeautifulSoup(results_page, convertEntities=BeautifulSoup.HTML_ENTITIES)
         results_table = soup.find(id="admin_table")
         login_userid_pairs = [self._login_and_uid_from_row(row) for row in results_table('tr')]
         # Filter out None from the logins.
-        return filter(lambda pair: bool(pair), login_userid_pairs)
+        return list(filter(lambda pair: bool(pair), login_userid_pairs))
 
     def _group_name_and_string_from_row(self, row):
         label_element = row.find('label')
@@ -86,7 +87,7 @@
         return (group_name, group_string)
 
     def user_dict_from_edit_user_page(self, page):
-        soup = BeautifulSoup(page, convertEntities=BeautifulStoneSoup.HTML_ENTITIES)
+        soup = BeautifulSoup(page, convertEntities=BeautifulSoup.HTML_ENTITIES)
         user_table = soup.find("table", {'class': 'main'})
         user_dict = {}
         for row in user_table('tr'):
@@ -209,7 +210,7 @@
                 continue
             patch_id = int(digits.search(patch_tag["href"]).group(0))
             date_tag = row.find("td", text=date_format)
-            if date_tag and datetime.strptime(date_format.search(date_tag).group(0), "%Y-%m-%d %H:%M") < since:
+            if date_tag and datetime.strptime(date_format.search(unicode(date_tag)).group(0), "%Y-%m-%d %H:%M") < since:
                 continue
             patch_ids.append(patch_id)
         return patch_ids
@@ -418,8 +419,12 @@
     def _parse_attachment_element(self, element, bug_id):
         attachment = {}
         attachment['bug_id'] = bug_id
-        attachment['is_obsolete'] = (element.has_key('isobsolete') and element['isobsolete'] == "1")
-        attachment['is_patch'] = (element.has_key('ispatch') and element['ispatch'] == "1")
+        if sys.version_info > (3, 0):
+            attachment['is_obsolete'] = (element.has_attr('isobsolete') and element['isobsolete'] == "1")
+            attachment['is_patch'] = (element.has_attr('ispatch') and element['ispatch'] == "1")
+        else:
+            attachment['is_obsolete'] = (element.has_key('isobsolete') and element['isobsolete'] == "1")
+            attachment['is_patch'] = (element.has_key('ispatch') and element['ispatch'] == "1")
         attachment['id'] = int(element.find('attachid').string)
         # FIXME: No need to parse out the url here.
         attachment['url'] = self.attachment_url_for_id(attachment['id'])
@@ -637,7 +642,7 @@
         # Only if file_or_string is not already encoded do we want to encode it.
         if isinstance(file_or_string, unicode):
             file_or_string = file_or_string.encode('utf-8')
-        return StringIO.StringIO(file_or_string)
+        return BytesIO(file_or_string)
 
     # timestamp argument is just for unittests.
     def _filename_for_upload(self, file_object, bug_id, extension="txt", timestamp=timestamp):
@@ -759,7 +764,7 @@
             # _fill_attachment_form expects a file-like object
             # Patch files are already binary, so no encoding needed.
             assert(isinstance(diff, str))
-            patch_file_object = StringIO.StringIO(diff)
+            patch_file_object = StringIO(diff)
             commit_flag = CommitQueueFlag.mark_for_nothing
             if mark_for_commit_queue:
                 commit_flag = CommitQueueFlag.mark_for_commit_queue
@@ -923,7 +928,7 @@
         # This is a hack around the fact that ClientForm.ListControl seems to
         # have no simpler way to ask if a control has an item named "REOPENED"
         # without using exceptions for control flow.
-        possible_bug_statuses = map(lambda item: item.name, bug_status.items)
+        possible_bug_statuses = list(map(lambda item: item.name, bug_status.items))
         if "REOPENED" in possible_bug_statuses:
             bug_status.value = ["REOPENED"]
         # If the bug was never confirmed it will not have a "REOPENED"
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_mock.py b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_mock.py
index 3ee4d39..d67a86f 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_mock.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_mock.py
@@ -30,9 +30,9 @@
 import datetime
 import logging
 
-from .bug import Bug
-from .bugzilla import Bugzilla
-from .attachment import Attachment
+from webkitpy.common.net.bugzilla.bug import Bug
+from webkitpy.common.net.bugzilla.bugzilla import Bugzilla
+from webkitpy.common.net.bugzilla.attachment import Attachment
 from webkitpy.common.config.committers import CommitterList, Reviewer
 
 _log = logging.getLogger(__name__)
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_unittest.py b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_unittest.py
index b113367..8033cbc 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_unittest.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/bugzilla_unittest.py
@@ -26,18 +26,18 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import StringIO
 import datetime
+import sys
 import unittest
 
-from .bugzilla import Bugzilla, BugzillaQueries, CommitQueueFlag, EditUsersParser
-
 from webkitpy.common.config import urls
 from webkitpy.common.config.committers import Reviewer, Committer, Contributor, CommitterList
-from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.common.net.web_mock import MockBrowser
-from webkitpy.thirdparty.mock import Mock
+from webkitpy.common.net.bugzilla.bugzilla import Bugzilla, BugzillaQueries, CommitQueueFlag, EditUsersParser
+from webkitpy.common.system.outputcapture import OutputCapture
+from webkitpy.common.unicode_compatibility import StringIO
 from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup
+from webkitpy.thirdparty.mock import Mock
 
 
 class BugzillaTest(unittest.TestCase):
@@ -67,7 +67,7 @@
         </attachment>
 '''
     _expected_example_attachment_parsing = {
-        'attach_date': datetime.datetime(2009, 07, 29, 10, 23),
+        'attach_date': datetime.datetime(2009, 7, 29, 10, 23),
         'bug_id': 100,
         'is_obsolete': True,
         'is_patch': True,
@@ -212,7 +212,7 @@
     # FIXME: This should move to a central location and be shared by more unit tests.
     def _assert_dictionaries_equal(self, actual, expected):
         # Make sure we aren't parsing more or less than we expect
-        self.assertItemsEqual(actual.keys(), expected.keys())
+        self.assertEqual(sorted(actual.keys()), sorted(expected.keys()))
 
         for key, expected_value in expected.items():
             self.assertEqual(actual[key], expected_value, ("Failure for key: %s: Actual='%s' Expected='%s'" % (key, actual[key], expected_value)))
@@ -303,7 +303,7 @@
 
     def test_file_object_for_upload(self):
         bugzilla = Bugzilla()
-        file_object = StringIO.StringIO()
+        file_object = StringIO()
         unicode_tor = u"WebKit \u2661 Tor Arne Vestb\u00F8!"
         utf8_tor = unicode_tor.encode("utf-8")
         self.assertEqual(bugzilla._file_object_for_upload(file_object), file_object)
@@ -316,7 +316,7 @@
         mock_file.name = "foo"
         self.assertEqual(bugzilla._filename_for_upload(mock_file, 1234), 'foo')
         mock_timestamp = lambda: "now"
-        filename = bugzilla._filename_for_upload(StringIO.StringIO(), 1234, extension="patch", timestamp=mock_timestamp)
+        filename = bugzilla._filename_for_upload(StringIO(), 1234, extension="patch", timestamp=mock_timestamp)
         self.assertEqual(filename, "bug-1234-now.patch")
 
     def test_commit_queue_flag(self):
diff --git a/Tools/Scripts/webkitpy/common/net/bugzilla/test_expectation_updater.py b/Tools/Scripts/webkitpy/common/net/bugzilla/test_expectation_updater.py
index 3bc55bf..a39a157 100644
--- a/Tools/Scripts/webkitpy/common/net/bugzilla/test_expectation_updater.py
+++ b/Tools/Scripts/webkitpy/common/net/bugzilla/test_expectation_updater.py
@@ -113,7 +113,7 @@
     # FIXME: Investigate the possibility to align what is done there with what single_test_runner is doing.
     # In particular the fact of not overwriting the file if content is the same.
     def _update_from_generic_attachment(self):
-        for test_name, expected_content in self._tests_to_update(self.generic_attachment).iteritems():
+        for test_name, expected_content in self._tests_to_update(self.generic_attachment).items():
             expected_filename = self.filesystem.join(self.layout_test_repository, TestResultWriter.expected_filename(test_name, self.filesystem))
             if expected_content != self._file_content_if_exists(expected_filename):
                 _log.info("Updating " + test_name + " (" + expected_filename + ")")
@@ -122,7 +122,7 @@
     # FIXME: Investigate the possibility to align what is done there with what single_test_runner is doing.
     # In particular the ability to remove a new specific expectation if it is the same as the generic one.
     def _update_from_platform_specific_attachment(self, attachment, bot_type):
-        for test_name, expected_content in self._tests_to_update(attachment, bot_type).iteritems():
+        for test_name, expected_content in self._tests_to_update(attachment, bot_type).items():
             expected_filename = self.filesystem.join(self.layout_test_repository, TestResultWriter.expected_filename(test_name, self.filesystem, bot_type))
             generic_expected_filename = self.filesystem.join(self.layout_test_repository, TestResultWriter.expected_filename(test_name, self.filesystem))
             if expected_content != self._file_content_if_exists(generic_expected_filename):
@@ -138,7 +138,7 @@
             return
         if self.generic_attachment:
             self._update_from_generic_attachment()
-        for bot_type, attachment in self.platform_specific_attachments.iteritems():
+        for bot_type, attachment in self.platform_specific_attachments.items():
             self._update_from_platform_specific_attachment(attachment, bot_type)
 
 
diff --git a/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py b/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py
index 614d3e4..3cf3da1 100644
--- a/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py
+++ b/Tools/Scripts/webkitpy/common/net/buildbot/buildbot.py
@@ -29,8 +29,8 @@
 import json
 import operator
 import re
+import sys
 import urllib
-import urllib2
 
 import webkitpy.common.config.urls as config_urls
 from webkitpy.common.memoized import memoized
@@ -39,8 +39,16 @@
 from webkitpy.common.net.networktransaction import NetworkTransaction
 from webkitpy.common.net.regressionwindow import RegressionWindow
 from webkitpy.common.system.logutils import get_logger
-from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup
 from webkitpy.thirdparty.autoinstalled.mechanize import Browser
+from webkitpy.thirdparty.BeautifulSoup import BeautifulSoup
+
+if sys.version_info > (3, 0):
+    from urllib.error import HTTPError, URLError
+    from urllib.parse import quote
+    from urllib.request import urlopen
+else:
+    from urllib2 import HTTPError, quote, URLError, urlopen
+
 
 
 _log = get_logger(__file__)
@@ -74,7 +82,7 @@
 
     def _fetch_file_from_results(self, results_url, file_name):
         # It seems this can return None if the url redirects and then returns 404.
-        result = urllib2.urlopen("%s/%s" % (results_url, file_name))
+        result = urlopen("%s/%s" % (results_url, file_name))
         if not result:
             return None
         # urlopen returns a file-like object which sometimes works fine with str()
@@ -161,7 +169,7 @@
             print("Loading revision/build list from %s." % self.results_url())
             print("This may take a while...")
             result_files = self._buildbot._fetch_twisted_directory_listing(self.results_url())
-        except urllib2.HTTPError as error:
+        except HTTPError as error:
             if error.code != 404:
                 raise
             _log.debug("Revision/build list failed to load.")
@@ -363,8 +371,8 @@
         # find a way to reduce the response size further.
         json_url = "%s/json/builders/%s/builds/%s?filter=1" % (self.buildbot_url, urllib.quote(builder.name()), build_number)
         try:
-            return json.load(urllib2.urlopen(json_url))
-        except urllib2.URLError as err:
+            return json.load(urlopen(json_url))
+        except URLError as err:
             build_url = Build.build_url(builder, build_number)
             _log.error("Error fetching data for %s build %s (%s, json: %s): %s" % (builder.name(), build_number, build_url, json_url, err))
             return None
@@ -375,7 +383,7 @@
 
     def _fetch_one_box_per_builder(self):
         build_status_url = "%s/one_box_per_builder" % self.buildbot_url
-        return urllib2.urlopen(build_status_url)
+        return urlopen(build_status_url)
 
     def _file_cell_text(self, file_cell):
         """Traverses down through firstChild elements until one containing a string is found, then returns that string"""
@@ -402,7 +410,7 @@
 
     # FIXME: There should be a better way to get this information directly from twisted.
     def _fetch_twisted_directory_listing(self, url):
-        return self._parse_twisted_directory_listing(urllib2.urlopen(url))
+        return self._parse_twisted_directory_listing(urlopen(url))
 
     def builders(self):
         return [self.builder_with_name(status["name"]) for status in self.builder_statuses()]
@@ -444,8 +452,8 @@
             build = build.previous_build()
 
     def _fetch_builder_page(self, builder):
-        builder_page_url = "%s/builders/%s?numbuilds=100" % (self.buildbot_url, urllib2.quote(builder.name()))
-        return urllib2.urlopen(builder_page_url)
+        builder_page_url = "%s/builders/%s?numbuilds=100" % (self.buildbot_url, quote(builder.name()))
+        return urlopen(builder_page_url)
 
     def _revisions_for_builder(self, builder):
         soup = BeautifulSoup(self._fetch_builder_page(builder))
diff --git a/Tools/Scripts/webkitpy/common/net/credentials.py b/Tools/Scripts/webkitpy/common/net/credentials.py
index d981478..cdeb4a8 100644
--- a/Tools/Scripts/webkitpy/common/net/credentials.py
+++ b/Tools/Scripts/webkitpy/common/net/credentials.py
@@ -37,7 +37,7 @@
 from webkitpy.common.checkout.scm import Git
 from webkitpy.common.system.executive import Executive, ScriptError
 from webkitpy.common.system.user import User
-from webkitpy.thirdparty.autoinstalled import keyring
+import webkitpy.thirdparty.autoinstalled.keyring as keyring
 
 _log = logging.getLogger(__name__)
 
diff --git a/Tools/Scripts/webkitpy/common/net/file_uploader.py b/Tools/Scripts/webkitpy/common/net/file_uploader.py
index 871295b..886653f 100644
--- a/Tools/Scripts/webkitpy/common/net/file_uploader.py
+++ b/Tools/Scripts/webkitpy/common/net/file_uploader.py
@@ -28,10 +28,14 @@
 
 import mimetypes
 import time
-import urllib2
+import sys
 
 from webkitpy.common.net.networktransaction import NetworkTransaction, NetworkTimeout
 
+if sys.version_info > (3, 0):
+    from urllib.request import Request, urlopen
+else:
+    from urllib2 import Request, urlopen
 
 def get_mime_type(filename):
     return mimetypes.guess_type(filename)[0] or 'application/octet-stream'
@@ -101,7 +105,7 @@
             # FIXME: Setting a timeout, either globally using socket.setdefaulttimeout()
             # or in urlopen(), doesn't appear to work on Mac 10.5 with Python 2.7.
             # For now we will ignore the timeout value and hope for the best.
-            request = urllib2.Request(self._url, data, {"Content-Type": content_type})
-            return urllib2.urlopen(request)
+            request = Request(self._url, data, {"Content-Type": content_type})
+            return urlopen(request)
 
         return NetworkTransaction(timeout_seconds=self._timeout_seconds).run(callback)
diff --git a/Tools/Scripts/webkitpy/common/net/resultsjsonparser.py b/Tools/Scripts/webkitpy/common/net/resultsjsonparser.py
index 32b22c9..3980357 100644
--- a/Tools/Scripts/webkitpy/common/net/resultsjsonparser.py
+++ b/Tools/Scripts/webkitpy/common/net/resultsjsonparser.py
@@ -82,7 +82,7 @@
         return True
 
     def _tokenize(self, results_string):
-        tokens = map(TestExpectations.expectation_from_string, results_string.split(' '))
+        tokens = list(map(TestExpectations.expectation_from_string, results_string.split(' ')))
         if None in tokens:
             _log.warning("Unrecognized result in %s" % results_string)
         return set(tokens)
diff --git a/Tools/Scripts/webkitpy/common/net/web_mock.py b/Tools/Scripts/webkitpy/common/net/web_mock.py
index e8b8405..0c7d5c5 100644
--- a/Tools/Scripts/webkitpy/common/net/web_mock.py
+++ b/Tools/Scripts/webkitpy/common/net/web_mock.py
@@ -27,8 +27,13 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import StringIO
-import urllib2
+from webkitpy.common.unicode_compatibility import StringIO
+
+import sys
+if sys.version_info > (3, 0):
+    from urllib.error import HTTPError
+else:
+    from urllib2 import HTTPError
 
 class MockWeb(object):
     def __init__(self, urls=None, responses=[]):
@@ -53,7 +58,7 @@
         self.body = values.get('body', '')
 
         if int(self.status_code) >= 400:
-            raise urllib2.HTTPError(
+            raise HTTPError(
                 url=self.url,
                 code=self.status_code,
                 msg='Received error status code: {}'.format(self.status_code),
@@ -83,7 +88,7 @@
         return self.params.get(key)
 
     def submit(self):
-        return StringIO.StringIO()
+        return StringIO()
 
     def set_handle_robots(self, value):
         pass
diff --git a/Tools/Scripts/webkitpy/common/system/autoinstall.py b/Tools/Scripts/webkitpy/common/system/autoinstall.py
index 570933b..f2017a8 100644
--- a/Tools/Scripts/webkitpy/common/system/autoinstall.py
+++ b/Tools/Scripts/webkitpy/common/system/autoinstall.py
@@ -483,7 +483,7 @@
 
     def install(self, url, should_refresh=False, target_name=None,
                 url_subpath=None, files_to_remove=None):
-        """Install a python package from an URL.
+        """Install a python package from an URL, return False if already installed.
 
         Args:
           url: The URL from which to download the package.
@@ -513,7 +513,7 @@
 
         target_path = os.path.join(self._target_dir, target_name.replace('/', os.sep))
         if not should_refresh and self._is_downloaded(target_name, url) and os.path.exists(target_path):
-            return
+            return False
 
         files_to_remove = files_to_remove or []
         package_name = target_name.replace(os.sep, '.')
@@ -542,3 +542,4 @@
             shutil.rmtree(scratch_dir, ignore_errors=True)
         _log.debug('Auto-installed %s to:' % url)
         _log.debug('    "%s"' % target_path)
+        return True
diff --git a/Tools/Scripts/webkitpy/common/system/filesystem_mock.py b/Tools/Scripts/webkitpy/common/system/filesystem_mock.py
index 3a8c935..3ea39c6 100644
--- a/Tools/Scripts/webkitpy/common/system/filesystem_mock.py
+++ b/Tools/Scripts/webkitpy/common/system/filesystem_mock.py
@@ -48,7 +48,7 @@
                 value of None is used to indicate that the file should
                 not exist.
         """
-        self.files = files or {}
+        self.files = {name: unicode_compatibility.encode_if_necessary(contents) for name, contents in (files or {}).items()}
         self.written_files = {}
         self.last_tmpdir = None
         self.current_tmpno = 0
diff --git a/Tools/Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py b/Tools/Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py
index 3b5abbc..85aeed8 100644
--- a/Tools/Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py
+++ b/Tools/Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py
@@ -31,9 +31,15 @@
 import subprocess
 import sys
 import time
-import urllib2
 import xml.dom.minidom
 
+if sys.version_info > (3, 0):
+    from urllib.error import HTTPError, URLError
+    from urllib.parse import quote
+    from urllib.request import urlopen
+else:
+    from urllib2 import HTTPError, quote, URLError, urlopen
+
 from webkitpy.common.checkout.scm.detection import SCMDetector
 from webkitpy.common.net.file_uploader import FileUploader
 
@@ -465,23 +471,23 @@
             return {}, None
 
         results_file_url = (self.URL_FOR_TEST_LIST_JSON %
-            (urllib2.quote(self._test_results_servers[server_index]),
-             urllib2.quote(self._builder_name),
+            (quote(self._test_results_servers[server_index]),
+             quote(self._builder_name),
              self.RESULTS_FILENAME,
-             urllib2.quote(self._test_type),
-             urllib2.quote(self._master_name)))
+             quote(self._test_type),
+             quote(self._master_name)))
 
         try:
             # FIXME: We should talk to the network via a Host object.
-            results_file = urllib2.urlopen(results_file_url)
+            results_file = urlopen(results_file_url)
             info = results_file.info()
             old_results = results_file.read()
-        except urllib2.HTTPError as http_error:
+        except HTTPError as http_error:
             # A non-4xx status code means the bot is hosed for some reason
             # and we can't grab the results.json file off of it.
             if (http_error.code < 400 and http_error.code >= 500):
                 error = http_error
-        except urllib2.URLError as url_error:
+        except URLError as url_error:
             error = url_error
 
         if old_results:
diff --git a/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py b/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
index 69e3362..e7c5813 100644
--- a/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
+++ b/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
@@ -235,7 +235,7 @@
     ]
 
     _configuration_tokens = dict((token, token.upper()) for token in _configuration_tokens_list)
-    _inverted_configuration_tokens = dict((value, name) for name, value in _configuration_tokens.iteritems())
+    _inverted_configuration_tokens = dict((value, name) for name, value in _configuration_tokens.items())
 
     # FIXME: Update the original modifiers list and remove this once the old syntax is gone.
     _expectation_tokens = {
@@ -252,7 +252,7 @@
         'WontFix': 'WONTFIX',
     }
 
-    _inverted_expectation_tokens = dict([(value, name) for name, value in _expectation_tokens.iteritems()] +
+    _inverted_expectation_tokens = dict([(value, name) for name, value in _expectation_tokens.items()] +
                                         [('TEXT', 'Failure'), ('IMAGE+TEXT', 'Failure'), ('AUDIO', 'Failure')])
 
     # FIXME: Seems like these should be classmethods on TestExpectationLine instead of TestExpectationParser.
diff --git a/Tools/Scripts/webkitpy/layout_tests/models/test_failures.py b/Tools/Scripts/webkitpy/layout_tests/models/test_failures.py
index d95da02..d0aa366 100644
--- a/Tools/Scripts/webkitpy/layout_tests/models/test_failures.py
+++ b/Tools/Scripts/webkitpy/layout_tests/models/test_failures.py
@@ -26,8 +26,14 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import cPickle
 import logging
+import sys
+
+if sys.version_info > (3, 0):
+    import pickle
+else:
+    import cPickle as pickle
+
 
 from webkitpy.layout_tests.models import test_expectations
 
@@ -91,7 +97,7 @@
     @staticmethod
     def loads(s):
         """Creates a TestFailure object from the specified string."""
-        return cPickle.loads(s)
+        return pickle.loads(s)
 
     def message(self):
         """Returns a string describing the failure in more detail."""
@@ -108,7 +114,7 @@
 
     def dumps(self):
         """Returns the string/JSON representation of a TestFailure."""
-        return cPickle.dumps(self)
+        return pickle.dumps(self)
 
     def driver_needs_restart(self):
         """Returns True if we should kill DumpRenderTree/WebKitTestRunner before the next test."""
diff --git a/Tools/Scripts/webkitpy/layout_tests/models/test_results.py b/Tools/Scripts/webkitpy/layout_tests/models/test_results.py
index 947f707..770840f 100644
--- a/Tools/Scripts/webkitpy/layout_tests/models/test_results.py
+++ b/Tools/Scripts/webkitpy/layout_tests/models/test_results.py
@@ -26,7 +26,11 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import cPickle
+import sys
+if sys.version_info > (3, 0):
+    import pickle
+else:
+    import cPickle as pickle
 
 from webkitpy.layout_tests.models import test_failures
 
@@ -36,7 +40,7 @@
 
     @staticmethod
     def loads(string):
-        return cPickle.loads(string)
+        return pickle.loads(string)
 
     def __init__(self, test_name, failures=None, test_run_time=None, has_stderr=False, reftest_type=None, pid=None, references=None):
         self.test_name = test_name
@@ -89,4 +93,4 @@
         return False
 
     def dumps(self):
-        return cPickle.dumps(self)
+        return pickle.dumps(self)
diff --git a/Tools/Scripts/webkitpy/port/darwin_testcase.py b/Tools/Scripts/webkitpy/port/darwin_testcase.py
index ef4386b..9b5caa4 100644
--- a/Tools/Scripts/webkitpy/port/darwin_testcase.py
+++ b/Tools/Scripts/webkitpy/port/darwin_testcase.py
@@ -94,7 +94,7 @@
         port = self.make_port()
         self.assertEqual(port.path_to_crash_logs(), '/Users/mock/Library/Logs/CrashReporter')
 
-        host = MockSystemHost(filesystem=MockFileSystem(files=['/Users/mock/Library/Logs/DiagnosticReports/crashlog.crash']))
+        host = MockSystemHost(filesystem=MockFileSystem(files={'/Users/mock/Library/Logs/DiagnosticReports/crashlog.crash': None}))
         port = self.make_port(host)
         self.assertEqual(port.path_to_crash_logs(), '/Users/mock/Library/Logs/DiagnosticReports')
 
diff --git a/Tools/Scripts/webkitpy/test/main.py b/Tools/Scripts/webkitpy/test/main.py
index 5145c57..7162d33 100644
--- a/Tools/Scripts/webkitpy/test/main.py
+++ b/Tools/Scripts/webkitpy/test/main.py
@@ -221,7 +221,12 @@
             self._options.child_processes = 1
 
             import webkitpy.thirdparty.autoinstalled.coverage as coverage
-            cov = coverage.coverage(omit=["/usr/*", "*/webkitpy/thirdparty/autoinstalled/*", "*/webkitpy/thirdparty/BeautifulSoup.py"])
+            cov = coverage.coverage(omit=[
+                "/usr/*",
+                "*/webkitpy/thirdparty/autoinstalled/*",
+                "*/webkitpy/thirdparty/BeautifulSoup.py",
+                "*/webkitpy/thirdparty/BeautifulSoup_legacy.py",
+            ])
             cov.start()
 
         self.printer.write_update("Checking imports ...")
diff --git a/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup.py b/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup.py
index 4b17b85..a48ba63 100644
--- a/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup.py
+++ b/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup.py
@@ -1,2014 +1,58 @@
-"""Beautiful Soup
-Elixir and Tonic
-"The Screen-Scraper's Friend"
-http://www.crummy.com/software/BeautifulSoup/
-
-Beautiful Soup parses a (possibly invalid) XML or HTML document into a
-tree representation. It provides methods and Pythonic idioms that make
-it easy to navigate, search, and modify the tree.
-
-A well-formed XML/HTML document yields a well-formed data
-structure. An ill-formed XML/HTML document yields a correspondingly
-ill-formed data structure. If your document is only locally
-well-formed, you can use this library to find and process the
-well-formed part of it.
-
-Beautiful Soup works with Python 2.2 and up. It has no external
-dependencies, but you'll have more success at converting data to UTF-8
-if you also install these three packages:
-
-* chardet, for auto-detecting character encodings
-  http://chardet.feedparser.org/
-* cjkcodecs and iconv_codec, which add more encodings to the ones supported
-  by stock Python.
-  http://cjkpython.i18n.org/
-
-Beautiful Soup defines classes for two main parsing strategies:
-
- * BeautifulStoneSoup, for parsing XML, SGML, or your domain-specific
-   language that kind of looks like XML.
-
- * BeautifulSoup, for parsing run-of-the-mill HTML code, be it valid
-   or invalid. This class has web browser-like heuristics for
-   obtaining a sensible parse tree in the face of common HTML errors.
-
-Beautiful Soup also defines a class (UnicodeDammit) for autodetecting
-the encoding of an HTML or XML document, and converting it to
-Unicode. Much of this code is taken from Mark Pilgrim's Universal Feed Parser.
-
-For more than you ever wanted to know about Beautiful Soup, see the
-documentation:
-http://www.crummy.com/software/BeautifulSoup/documentation.html
-
-Here, have some legalese:
-
-Copyright (c) 2004-2010, Leonard Richardson
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-  * Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
-
-  * Redistributions in binary form must reproduce the above
-    copyright notice, this list of conditions and the following
-    disclaimer in the documentation and/or other materials provided
-    with the distribution.
-
-  * Neither the name of the the Beautiful Soup Consortium and All
-    Night Kosher Bakery nor the names of its contributors may be
-    used to endorse or promote products derived from this software
-    without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE, DAMMIT.
-
-"""
-from __future__ import generators
-
-__author__ = "Leonard Richardson (leonardr@segfault.org)"
-__version__ = "3.2.0"
-__copyright__ = "Copyright (c) 2004-2010 Leonard Richardson"
-__license__ = "New-style BSD"
-
-from sgmllib import SGMLParser, SGMLParseError
-import codecs
-import markupbase
-import types
-import re
-import sgmllib
-try:
-  from htmlentitydefs import name2codepoint
-except ImportError:
-  name2codepoint = {}
-try:
-    set
-except NameError:
-    from sets import Set as set
-
-#These hacks make Beautiful Soup able to parse XML with namespaces
-sgmllib.tagfind = re.compile('[a-zA-Z][-_.:a-zA-Z0-9]*')
-markupbase._declname_match = re.compile(r'[a-zA-Z][-_.:a-zA-Z0-9]*\s*').match
-
-DEFAULT_OUTPUT_ENCODING = "utf-8"
-
-def _match_css_class(str):
-    """Build a RE to match the given CSS class."""
-    return re.compile(r"(^|.*\s)%s($|\s)" % str)
-
-# First, the classes that represent markup elements.
-
-class PageElement(object):
-    """Contains the navigational information for some part of the page
-    (either a tag or a piece of text)"""
-
-    def setup(self, parent=None, previous=None):
-        """Sets up the initial relations between this element and
-        other elements."""
-        self.parent = parent
-        self.previous = previous
-        self.next = None
-        self.previousSibling = None
-        self.nextSibling = None
-        if self.parent and self.parent.contents:
-            self.previousSibling = self.parent.contents[-1]
-            self.previousSibling.nextSibling = self
-
-    def replaceWith(self, replaceWith):
-        oldParent = self.parent
-        myIndex = self.parent.index(self)
-        if hasattr(replaceWith, "parent")\
-                  and replaceWith.parent is self.parent:
-            # We're replacing this element with one of its siblings.
-            index = replaceWith.parent.index(replaceWith)
-            if index and index < myIndex:
-                # Furthermore, it comes before this element. That
-                # means that when we extract it, the index of this
-                # element will change.
-                myIndex = myIndex - 1
-        self.extract()
-        oldParent.insert(myIndex, replaceWith)
-
-    def replaceWithChildren(self):
-        myParent = self.parent
-        myIndex = self.parent.index(self)
-        self.extract()
-        reversedChildren = list(self.contents)
-        reversedChildren.reverse()
-        for child in reversedChildren:
-            myParent.insert(myIndex, child)
-
-    def extract(self):
-        """Destructively rips this element out of the tree."""
-        if self.parent:
-            try:
-                del self.parent.contents[self.parent.index(self)]
-            except ValueError:
-                pass
-
-        #Find the two elements that would be next to each other if
-        #this element (and any children) hadn't been parsed. Connect
-        #the two.
-        lastChild = self._lastRecursiveChild()
-        nextElement = lastChild.next
-
-        if self.previous:
-            self.previous.next = nextElement
-        if nextElement:
-            nextElement.previous = self.previous
-        self.previous = None
-        lastChild.next = None
-
-        self.parent = None
-        if self.previousSibling:
-            self.previousSibling.nextSibling = self.nextSibling
-        if self.nextSibling:
-            self.nextSibling.previousSibling = self.previousSibling
-        self.previousSibling = self.nextSibling = None
-        return self
-
-    def _lastRecursiveChild(self):
-        "Finds the last element beneath this object to be parsed."
-        lastChild = self
-        while hasattr(lastChild, 'contents') and lastChild.contents:
-            lastChild = lastChild.contents[-1]
-        return lastChild
-
-    def insert(self, position, newChild):
-        if isinstance(newChild, basestring) \
-            and not isinstance(newChild, NavigableString):
-            newChild = NavigableString(newChild)
-
-        position =  min(position, len(self.contents))
-        if hasattr(newChild, 'parent') and newChild.parent is not None:
-            # We're 'inserting' an element that's already one
-            # of this object's children.
-            if newChild.parent is self:
-                index = self.index(newChild)
-                if index > position:
-                    # Furthermore we're moving it further down the
-                    # list of this object's children. That means that
-                    # when we extract this element, our target index
-                    # will jump down one.
-                    position = position - 1
-            newChild.extract()
-
-        newChild.parent = self
-        previousChild = None
-        if position == 0:
-            newChild.previousSibling = None
-            newChild.previous = self
-        else:
-            previousChild = self.contents[position-1]
-            newChild.previousSibling = previousChild
-            newChild.previousSibling.nextSibling = newChild
-            newChild.previous = previousChild._lastRecursiveChild()
-        if newChild.previous:
-            newChild.previous.next = newChild
-
-        newChildsLastElement = newChild._lastRecursiveChild()
-
-        if position >= len(self.contents):
-            newChild.nextSibling = None
-
-            parent = self
-            parentsNextSibling = None
-            while not parentsNextSibling:
-                parentsNextSibling = parent.nextSibling
-                parent = parent.parent
-                if not parent: # This is the last element in the document.
-                    break
-            if parentsNextSibling:
-                newChildsLastElement.next = parentsNextSibling
-            else:
-                newChildsLastElement.next = None
-        else:
-            nextChild = self.contents[position]
-            newChild.nextSibling = nextChild
-            if newChild.nextSibling:
-                newChild.nextSibling.previousSibling = newChild
-            newChildsLastElement.next = nextChild
-
-        if newChildsLastElement.next:
-            newChildsLastElement.next.previous = newChildsLastElement
-        self.contents.insert(position, newChild)
-
-    def append(self, tag):
-        """Appends the given tag to the contents of this tag."""
-        self.insert(len(self.contents), tag)
-
-    def findNext(self, name=None, attrs={}, text=None, **kwargs):
-        """Returns the first item that matches the given criteria and
-        appears after this Tag in the document."""
-        return self._findOne(self.findAllNext, name, attrs, text, **kwargs)
-
-    def findAllNext(self, name=None, attrs={}, text=None, limit=None,
-                    **kwargs):
-        """Returns all items that match the given criteria and appear
-        after this Tag in the document."""
-        return self._findAll(name, attrs, text, limit, self.nextGenerator,
-                             **kwargs)
-
-    def findNextSibling(self, name=None, attrs={}, text=None, **kwargs):
-        """Returns the closest sibling to this Tag that matches the
-        given criteria and appears after this Tag in the document."""
-        return self._findOne(self.findNextSiblings, name, attrs, text,
-                             **kwargs)
-
-    def findNextSiblings(self, name=None, attrs={}, text=None, limit=None,
-                         **kwargs):
-        """Returns the siblings of this Tag that match the given
-        criteria and appear after this Tag in the document."""
-        return self._findAll(name, attrs, text, limit,
-                             self.nextSiblingGenerator, **kwargs)
-    fetchNextSiblings = findNextSiblings # Compatibility with pre-3.x
-
-    def findPrevious(self, name=None, attrs={}, text=None, **kwargs):
-        """Returns the first item that matches the given criteria and
-        appears before this Tag in the document."""
-        return self._findOne(self.findAllPrevious, name, attrs, text, **kwargs)
-
-    def findAllPrevious(self, name=None, attrs={}, text=None, limit=None,
-                        **kwargs):
-        """Returns all items that match the given criteria and appear
-        before this Tag in the document."""
-        return self._findAll(name, attrs, text, limit, self.previousGenerator,
-                           **kwargs)
-    fetchPrevious = findAllPrevious # Compatibility with pre-3.x
-
-    def findPreviousSibling(self, name=None, attrs={}, text=None, **kwargs):
-        """Returns the closest sibling to this Tag that matches the
-        given criteria and appears before this Tag in the document."""
-        return self._findOne(self.findPreviousSiblings, name, attrs, text,
-                             **kwargs)
-
-    def findPreviousSiblings(self, name=None, attrs={}, text=None,
-                             limit=None, **kwargs):
-        """Returns the siblings of this Tag that match the given
-        criteria and appear before this Tag in the document."""
-        return self._findAll(name, attrs, text, limit,
-                             self.previousSiblingGenerator, **kwargs)
-    fetchPreviousSiblings = findPreviousSiblings # Compatibility with pre-3.x
-
-    def findParent(self, name=None, attrs={}, **kwargs):
-        """Returns the closest parent of this Tag that matches the given
-        criteria."""
-        # NOTE: We can't use _findOne because findParents takes a different
-        # set of arguments.
-        r = None
-        l = self.findParents(name, attrs, 1)
-        if l:
-            r = l[0]
-        return r
-
-    def findParents(self, name=None, attrs={}, limit=None, **kwargs):
-        """Returns the parents of this Tag that match the given
-        criteria."""
-
-        return self._findAll(name, attrs, None, limit, self.parentGenerator,
-                             **kwargs)
-    fetchParents = findParents # Compatibility with pre-3.x
-
-    #These methods do the real heavy lifting.
-
-    def _findOne(self, method, name, attrs, text, **kwargs):
-        r = None
-        l = method(name, attrs, text, 1, **kwargs)
-        if l:
-            r = l[0]
-        return r
-
-    def _findAll(self, name, attrs, text, limit, generator, **kwargs):
-        "Iterates over a generator looking for things that match."
-
-        if isinstance(name, SoupStrainer):
-            strainer = name
-        # (Possibly) special case some findAll*(...) searches
-        elif text is None and not limit and not attrs and not kwargs:
-            # findAll*(True)
-            if name is True:
-                return [element for element in generator()
-                        if isinstance(element, Tag)]
-            # findAll*('tag-name')
-            elif isinstance(name, basestring):
-                return [element for element in generator()
-                        if isinstance(element, Tag) and
-                        element.name == name]
-            else:
-                strainer = SoupStrainer(name, attrs, text, **kwargs)
-        # Build a SoupStrainer
-        else:
-            strainer = SoupStrainer(name, attrs, text, **kwargs)
-        results = ResultSet(strainer)
-        g = generator()
-        while True:
-            try:
-                i = g.next()
-            except StopIteration:
-                break
-            if i:
-                found = strainer.search(i)
-                if found:
-                    results.append(found)
-                    if limit and len(results) >= limit:
-                        break
-        return results
-
-    #These Generators can be used to navigate starting from both
-    #NavigableStrings and Tags.
-    def nextGenerator(self):
-        i = self
-        while i is not None:
-            i = i.next
-            yield i
-
-    def nextSiblingGenerator(self):
-        i = self
-        while i is not None:
-            i = i.nextSibling
-            yield i
-
-    def previousGenerator(self):
-        i = self
-        while i is not None:
-            i = i.previous
-            yield i
-
-    def previousSiblingGenerator(self):
-        i = self
-        while i is not None:
-            i = i.previousSibling
-            yield i
-
-    def parentGenerator(self):
-        i = self
-        while i is not None:
-            i = i.parent
-            yield i
-
-    # Utility methods
-    def substituteEncoding(self, str, encoding=None):
-        encoding = encoding or "utf-8"
-        return str.replace("%SOUP-ENCODING%", encoding)
-
-    def toEncoding(self, s, encoding=None):
-        """Encodes an object to a string in some encoding, or to Unicode.
-        ."""
-        if isinstance(s, unicode):
-            if encoding:
-                s = s.encode(encoding)
-        elif isinstance(s, str):
-            if encoding:
-                s = s.encode(encoding)
-            else:
-                s = unicode(s)
-        else:
-            if encoding:
-                s  = self.toEncoding(str(s), encoding)
-            else:
-                s = unicode(s)
-        return s
-
-class NavigableString(unicode, PageElement):
-
-    def __new__(cls, value):
-        """Create a new NavigableString.
-
-        When unpickling a NavigableString, this method is called with
-        the string in DEFAULT_OUTPUT_ENCODING. That encoding needs to be
-        passed in to the superclass's __new__ or the superclass won't know
-        how to handle non-ASCII characters.
-        """
-        if isinstance(value, unicode):
-            return unicode.__new__(cls, value)
-        return unicode.__new__(cls, value, DEFAULT_OUTPUT_ENCODING)
-
-    def __getnewargs__(self):
-        return (NavigableString.__str__(self),)
-
-    def __getattr__(self, attr):
-        """text.string gives you text. This is for backwards
-        compatibility for Navigable*String, but for CData* it lets you
-        get the string without the CData wrapper."""
-        if attr == 'string':
-            return self
-        else:
-            raise AttributeError, "'%s' object has no attribute '%s'" % (self.__class__.__name__, attr)
-
-    def __unicode__(self):
-        return str(self).decode(DEFAULT_OUTPUT_ENCODING)
-
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        if encoding:
-            return self.encode(encoding)
-        else:
-            return self
-
-class CData(NavigableString):
-
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        return "<![CDATA[%s]]>" % NavigableString.__str__(self, encoding)
-
-class ProcessingInstruction(NavigableString):
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        output = self
-        if "%SOUP-ENCODING%" in output:
-            output = self.substituteEncoding(output, encoding)
-        return "<?%s?>" % self.toEncoding(output, encoding)
-
-class Comment(NavigableString):
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        return "<!--%s-->" % NavigableString.__str__(self, encoding)
-
-class Declaration(NavigableString):
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        return "<!%s>" % NavigableString.__str__(self, encoding)
-
-class Tag(PageElement):
-
-    """Represents a found HTML tag with its attributes and contents."""
-
-    def _invert(h):
-        "Cheap function to invert a hash."
-        i = {}
-        for k,v in h.items():
-            i[v] = k
-        return i
-
-    XML_ENTITIES_TO_SPECIAL_CHARS = { "apos" : "'",
-                                      "quot" : '"',
-                                      "amp" : "&",
-                                      "lt" : "<",
-                                      "gt" : ">" }
-
-    XML_SPECIAL_CHARS_TO_ENTITIES = _invert(XML_ENTITIES_TO_SPECIAL_CHARS)
-
-    def _convertEntities(self, match):
-        """Used in a call to re.sub to replace HTML, XML, and numeric
-        entities with the appropriate Unicode characters. If HTML
-        entities are being converted, any unrecognized entities are
-        escaped."""
-        x = match.group(1)
-        if self.convertHTMLEntities and x in name2codepoint:
-            return unichr(name2codepoint[x])
-        elif x in self.XML_ENTITIES_TO_SPECIAL_CHARS:
-            if self.convertXMLEntities:
-                return self.XML_ENTITIES_TO_SPECIAL_CHARS[x]
-            else:
-                return u'&%s;' % x
-        elif len(x) > 0 and x[0] == '#':
-            # Handle numeric entities
-            if len(x) > 1 and x[1] == 'x':
-                return unichr(int(x[2:], 16))
-            else:
-                return unichr(int(x[1:]))
-
-        elif self.escapeUnrecognizedEntities:
-            return u'&amp;%s;' % x
-        else:
-            return u'&%s;' % x
-
-    def __init__(self, parser, name, attrs=None, parent=None,
-                 previous=None):
-        "Basic constructor."
-
-        # We don't actually store the parser object: that lets extracted
-        # chunks be garbage-collected
-        self.parserClass = parser.__class__
-        self.isSelfClosing = parser.isSelfClosingTag(name)
-        self.name = name
-        if attrs is None:
-            attrs = []
-        elif isinstance(attrs, dict):
-            attrs = attrs.items()
-        self.attrs = attrs
-        self.contents = []
-        self.setup(parent, previous)
-        self.hidden = False
-        self.containsSubstitutions = False
-        self.convertHTMLEntities = parser.convertHTMLEntities
-        self.convertXMLEntities = parser.convertXMLEntities
-        self.escapeUnrecognizedEntities = parser.escapeUnrecognizedEntities
-
-        # Convert any HTML, XML, or numeric entities in the attribute values.
-        convert = lambda(k, val): (k,
-                                   re.sub("&(#\d+|#x[0-9a-fA-F]+|\w+);",
-                                          self._convertEntities,
-                                          val))
-        self.attrs = map(convert, self.attrs)
-
-    def getString(self):
-        if (len(self.contents) == 1
-            and isinstance(self.contents[0], NavigableString)):
-            return self.contents[0]
-
-    def setString(self, string):
-        """Replace the contents of the tag with a string"""
-        self.clear()
-        self.append(string)
-
-    string = property(getString, setString)
-
-    def getText(self, separator=u""):
-        if not len(self.contents):
-            return u""
-        stopNode = self._lastRecursiveChild().next
-        strings = []
-        current = self.contents[0]
-        while current is not stopNode:
-            if isinstance(current, NavigableString):
-                strings.append(current.strip())
-            current = current.next
-        return separator.join(strings)
-
-    text = property(getText)
-
-    def get(self, key, default=None):
-        """Returns the value of the 'key' attribute for the tag, or
-        the value given for 'default' if it doesn't have that
-        attribute."""
-        return self._getAttrMap().get(key, default)
-
-    def clear(self):
-        """Extract all children."""
-        for child in self.contents[:]:
-            child.extract()
-
-    def index(self, element):
-        for i, child in enumerate(self.contents):
-            if child is element:
-                return i
-        raise ValueError("Tag.index: element not in tag")
-
-    def has_key(self, key):
-        return self._getAttrMap().has_key(key)
-
-    def __getitem__(self, key):
-        """tag[key] returns the value of the 'key' attribute for the tag,
-        and throws an exception if it's not there."""
-        return self._getAttrMap()[key]
-
-    def __iter__(self):
-        "Iterating over a tag iterates over its contents."
-        return iter(self.contents)
-
-    def __len__(self):
-        "The length of a tag is the length of its list of contents."
-        return len(self.contents)
-
-    def __contains__(self, x):
-        return x in self.contents
-
-    def __nonzero__(self):
-        "A tag is non-None even if it has no contents."
-        return True
-
-    def __setitem__(self, key, value):
-        """Setting tag[key] sets the value of the 'key' attribute for the
-        tag."""
-        self._getAttrMap()
-        self.attrMap[key] = value
-        found = False
-        for i in range(0, len(self.attrs)):
-            if self.attrs[i][0] == key:
-                self.attrs[i] = (key, value)
-                found = True
-        if not found:
-            self.attrs.append((key, value))
-        self._getAttrMap()[key] = value
-
-    def __delitem__(self, key):
-        "Deleting tag[key] deletes all 'key' attributes for the tag."
-        for item in self.attrs:
-            if item[0] == key:
-                self.attrs.remove(item)
-                #We don't break because bad HTML can define the same
-                #attribute multiple times.
-            self._getAttrMap()
-            if self.attrMap.has_key(key):
-                del self.attrMap[key]
-
-    def __call__(self, *args, **kwargs):
-        """Calling a tag like a function is the same as calling its
-        findAll() method. Eg. tag('a') returns a list of all the A tags
-        found within this tag."""
-        return apply(self.findAll, args, kwargs)
-
-    def __getattr__(self, tag):
-        #print "Getattr %s.%s" % (self.__class__, tag)
-        if len(tag) > 3 and tag.rfind('Tag') == len(tag)-3:
-            return self.find(tag[:-3])
-        elif tag.find('__') != 0:
-            return self.find(tag)
-        raise AttributeError, "'%s' object has no attribute '%s'" % (self.__class__, tag)
-
-    def __eq__(self, other):
-        """Returns true iff this tag has the same name, the same attributes,
-        and the same contents (recursively) as the given tag.
-
-        NOTE: right now this will return false if two tags have the
-        same attributes in a different order. Should this be fixed?"""
-        if other is self:
-            return True
-        if not hasattr(other, 'name') or not hasattr(other, 'attrs') or not hasattr(other, 'contents') or self.name != other.name or self.attrs != other.attrs or len(self) != len(other):
-            return False
-        for i in range(0, len(self.contents)):
-            if self.contents[i] != other.contents[i]:
-                return False
-        return True
-
-    def __ne__(self, other):
-        """Returns true iff this tag is not identical to the other tag,
-        as defined in __eq__."""
-        return not self == other
-
-    def __repr__(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        """Renders this tag as a string."""
-        return self.__str__(encoding)
-
-    def __unicode__(self):
-        return self.__str__(None)
-
-    BARE_AMPERSAND_OR_BRACKET = re.compile("([<>]|"
-                                           + "&(?!#\d+;|#x[0-9a-fA-F]+;|\w+;)"
-                                           + ")")
-
-    def _sub_entity(self, x):
-        """Used with a regular expression to substitute the
-        appropriate XML entity for an XML special character."""
-        return "&" + self.XML_SPECIAL_CHARS_TO_ENTITIES[x.group(0)[0]] + ";"
-
-    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING,
-                prettyPrint=False, indentLevel=0):
-        """Returns a string or Unicode representation of this tag and
-        its contents. To get Unicode, pass None for encoding.
-
-        NOTE: since Python's HTML parser consumes whitespace, this
-        method is not certain to reproduce the whitespace present in
-        the original string."""
-
-        encodedName = self.toEncoding(self.name, encoding)
-
-        attrs = []
-        if self.attrs:
-            for key, val in self.attrs:
-                fmt = '%s="%s"'
-                if isinstance(val, basestring):
-                    if self.containsSubstitutions and '%SOUP-ENCODING%' in val:
-                        val = self.substituteEncoding(val, encoding)
-
-                    # The attribute value either:
-                    #
-                    # * Contains no embedded double quotes or single quotes.
-                    #   No problem: we enclose it in double quotes.
-                    # * Contains embedded single quotes. No problem:
-                    #   double quotes work here too.
-                    # * Contains embedded double quotes. No problem:
-                    #   we enclose it in single quotes.
-                    # * Embeds both single _and_ double quotes. This
-                    #   can't happen naturally, but it can happen if
-                    #   you modify an attribute value after parsing
-                    #   the document. Now we have a bit of a
-                    #   problem. We solve it by enclosing the
-                    #   attribute in single quotes, and escaping any
-                    #   embedded single quotes to XML entities.
-                    if '"' in val:
-                        fmt = "%s='%s'"
-                        if "'" in val:
-                            # TODO: replace with apos when
-                            # appropriate.
-                            val = val.replace("'", "&squot;")
-
-                    # Now we're okay w/r/t quotes. But the attribute
-                    # value might also contain angle brackets, or
-                    # ampersands that aren't part of entities. We need
-                    # to escape those to XML entities too.
-                    val = self.BARE_AMPERSAND_OR_BRACKET.sub(self._sub_entity, val)
-
-                attrs.append(fmt % (self.toEncoding(key, encoding),
-                                    self.toEncoding(val, encoding)))
-        close = ''
-        closeTag = ''
-        if self.isSelfClosing:
-            close = ' /'
-        else:
-            closeTag = '</%s>' % encodedName
-
-        indentTag, indentContents = 0, 0
-        if prettyPrint:
-            indentTag = indentLevel
-            space = (' ' * (indentTag-1))
-            indentContents = indentTag + 1
-        contents = self.renderContents(encoding, prettyPrint, indentContents)
-        if self.hidden:
-            s = contents
-        else:
-            s = []
-            attributeString = ''
-            if attrs:
-                attributeString = ' ' + ' '.join(attrs)
-            if prettyPrint:
-                s.append(space)
-            s.append('<%s%s%s>' % (encodedName, attributeString, close))
-            if prettyPrint:
-                s.append("\n")
-            s.append(contents)
-            if prettyPrint and contents and contents[-1] != "\n":
-                s.append("\n")
-            if prettyPrint and closeTag:
-                s.append(space)
-            s.append(closeTag)
-            if prettyPrint and closeTag and self.nextSibling:
-                s.append("\n")
-            s = ''.join(s)
-        return s
-
-    def decompose(self):
-        """Recursively destroys the contents of this tree."""
-        self.extract()
-        if len(self.contents) == 0:
-            return
-        current = self.contents[0]
-        while current is not None:
-            next = current.next
-            if isinstance(current, Tag):
-                del current.contents[:]
-            current.parent = None
-            current.previous = None
-            current.previousSibling = None
-            current.next = None
-            current.nextSibling = None
-            current = next
-
-    def prettify(self, encoding=DEFAULT_OUTPUT_ENCODING):
-        return self.__str__(encoding, True)
-
-    def renderContents(self, encoding=DEFAULT_OUTPUT_ENCODING,
-                       prettyPrint=False, indentLevel=0):
-        """Renders the contents of this tag as a string in the given
-        encoding. If encoding is None, returns a Unicode string.."""
-        s=[]
-        for c in self:
-            text = None
-            if isinstance(c, NavigableString):
-                text = c.__str__(encoding)
-            elif isinstance(c, Tag):
-                s.append(c.__str__(encoding, prettyPrint, indentLevel))
-            if text and prettyPrint:
-                text = text.strip()
-            if text:
-                if prettyPrint:
-                    s.append(" " * (indentLevel-1))
-                s.append(text)
-                if prettyPrint:
-                    s.append("\n")
-        return ''.join(s)
-
-    #Soup methods
-
-    def find(self, name=None, attrs={}, recursive=True, text=None,
-             **kwargs):
-        """Return only the first child of this Tag matching the given
-        criteria."""
-        r = None
-        l = self.findAll(name, attrs, recursive, text, 1, **kwargs)
-        if l:
-            r = l[0]
-        return r
-    findChild = find
-
-    def findAll(self, name=None, attrs={}, recursive=True, text=None,
-                limit=None, **kwargs):
-        """Extracts a list of Tag objects that match the given
-        criteria.  You can specify the name of the Tag and any
-        attributes you want the Tag to have.
-
-        The value of a key-value pair in the 'attrs' map can be a
-        string, a list of strings, a regular expression object, or a
-        callable that takes a string and returns whether or not the
-        string matches for some custom definition of 'matches'. The
-        same is true of the tag name."""
-        generator = self.recursiveChildGenerator
-        if not recursive:
-            generator = self.childGenerator
-        return self._findAll(name, attrs, text, limit, generator, **kwargs)
-    findChildren = findAll
-
-    # Pre-3.x compatibility methods
-    first = find
-    fetch = findAll
-
-    def fetchText(self, text=None, recursive=True, limit=None):
-        return self.findAll(text=text, recursive=recursive, limit=limit)
-
-    def firstText(self, text=None, recursive=True):
-        return self.find(text=text, recursive=recursive)
-
-    #Private methods
-
-    def _getAttrMap(self):
-        """Initializes a map representation of this tag's attributes,
-        if not already initialized."""
-        if not getattr(self, 'attrMap'):
-            self.attrMap = {}
-            for (key, value) in self.attrs:
-                self.attrMap[key] = value
-        return self.attrMap
-
-    #Generator methods
-    def childGenerator(self):
-        # Just use the iterator from the contents
-        return iter(self.contents)
-
-    def recursiveChildGenerator(self):
-        if not len(self.contents):
-            raise StopIteration
-        stopNode = self._lastRecursiveChild().next
-        current = self.contents[0]
-        while current is not stopNode:
-            yield current
-            current = current.next
-
-
-# Next, a couple classes to represent queries and their results.
-class SoupStrainer:
-    """Encapsulates a number of ways of matching a markup element (tag or
-    text)."""
-
-    def __init__(self, name=None, attrs={}, text=None, **kwargs):
-        self.name = name
-        if isinstance(attrs, basestring):
-            kwargs['class'] = _match_css_class(attrs)
-            attrs = None
-        if kwargs:
-            if attrs:
-                attrs = attrs.copy()
-                attrs.update(kwargs)
-            else:
-                attrs = kwargs
-        self.attrs = attrs
-        self.text = text
-
-    def __str__(self):
-        if self.text:
-            return self.text
-        else:
-            return "%s|%s" % (self.name, self.attrs)
-
-    def searchTag(self, markupName=None, markupAttrs={}):
-        found = None
-        markup = None
-        if isinstance(markupName, Tag):
-            markup = markupName
-            markupAttrs = markup
-        callFunctionWithTagData = callable(self.name) \
-                                and not isinstance(markupName, Tag)
-
-        if (not self.name) \
-               or callFunctionWithTagData \
-               or (markup and self._matches(markup, self.name)) \
-               or (not markup and self._matches(markupName, self.name)):
-            if callFunctionWithTagData:
-                match = self.name(markupName, markupAttrs)
-            else:
-                match = True
-                markupAttrMap = None
-                for attr, matchAgainst in self.attrs.items():
-                    if not markupAttrMap:
-                         if hasattr(markupAttrs, 'get'):
-                            markupAttrMap = markupAttrs
-                         else:
-                            markupAttrMap = {}
-                            for k,v in markupAttrs:
-                                markupAttrMap[k] = v
-                    attrValue = markupAttrMap.get(attr)
-                    if not self._matches(attrValue, matchAgainst):
-                        match = False
-                        break
-            if match:
-                if markup:
-                    found = markup
-                else:
-                    found = markupName
-        return found
-
-    def search(self, markup):
-        #print 'looking for %s in %s' % (self, markup)
-        found = None
-        # If given a list of items, scan it for a text element that
-        # matches.
-        if hasattr(markup, "__iter__") \
-                and not isinstance(markup, Tag):
-            for element in markup:
-                if isinstance(element, NavigableString) \
-                       and self.search(element):
-                    found = element
-                    break
-        # If it's a Tag, make sure its name or attributes match.
-        # Don't bother with Tags if we're searching for text.
-        elif isinstance(markup, Tag):
-            if not self.text:
-                found = self.searchTag(markup)
-        # If it's text, make sure the text matches.
-        elif isinstance(markup, NavigableString) or \
-                 isinstance(markup, basestring):
-            if self._matches(markup, self.text):
-                found = markup
-        else:
-            raise Exception, "I don't know how to match against a %s" \
-                  % markup.__class__
-        return found
-
-    def _matches(self, markup, matchAgainst):
-        #print "Matching %s against %s" % (markup, matchAgainst)
-        result = False
-        if matchAgainst is True:
-            result = markup is not None
-        elif callable(matchAgainst):
-            result = matchAgainst(markup)
-        else:
-            #Custom match methods take the tag as an argument, but all
-            #other ways of matching match the tag name as a string.
-            if isinstance(markup, Tag):
-                markup = markup.name
-            if markup and not isinstance(markup, basestring):
-                markup = unicode(markup)
-            #Now we know that chunk is either a string, or None.
-            if hasattr(matchAgainst, 'match'):
-                # It's a regexp object.
-                result = markup and matchAgainst.search(markup)
-            elif hasattr(matchAgainst, '__iter__'): # list-like
-                result = markup in matchAgainst
-            elif hasattr(matchAgainst, 'items'):
-                result = markup.has_key(matchAgainst)
-            elif matchAgainst and isinstance(markup, basestring):
-                if isinstance(markup, unicode):
-                    matchAgainst = unicode(matchAgainst)
-                else:
-                    matchAgainst = str(matchAgainst)
-
-            if not result:
-                result = matchAgainst == markup
-        return result
-
-class ResultSet(list):
-    """A ResultSet is just a list that keeps track of the SoupStrainer
-    that created it."""
-    def __init__(self, source):
-        list.__init__([])
-        self.source = source
-
-# Now, some helper functions.
-
-def buildTagMap(default, *args):
-    """Turns a list of maps, lists, or scalars into a single map.
-    Used to build the SELF_CLOSING_TAGS, NESTABLE_TAGS, and
-    NESTING_RESET_TAGS maps out of lists and partial maps."""
-    built = {}
-    for portion in args:
-        if hasattr(portion, 'items'):
-            #It's a map. Merge it.
-            for k,v in portion.items():
-                built[k] = v
-        elif hasattr(portion, '__iter__'): # is a list
-            #It's a list. Map each item to the default.
-            for k in portion:
-                built[k] = default
-        else:
-            #It's a scalar. Map it to the default.
-            built[portion] = default
-    return built
-
-# Now, the parser classes.
-
-class BeautifulStoneSoup(Tag, SGMLParser):
-
-    """This class contains the basic parser and search code. It defines
-    a parser that knows nothing about tag behavior except for the
-    following:
-
-      You can't close a tag without closing all the tags it encloses.
-      That is, "<foo><bar></foo>" actually means
-      "<foo><bar></bar></foo>".
-
-    [Another possible explanation is "<foo><bar /></foo>", but since
-    this class defines no SELF_CLOSING_TAGS, it will never use that
-    explanation.]
-
-    This class is useful for parsing XML or made-up markup languages,
-    or when BeautifulSoup makes an assumption counter to what you were
-    expecting."""
-
-    SELF_CLOSING_TAGS = {}
-    NESTABLE_TAGS = {}
-    RESET_NESTING_TAGS = {}
-    QUOTE_TAGS = {}
-    PRESERVE_WHITESPACE_TAGS = []
-
-    MARKUP_MASSAGE = [(re.compile('(<[^<>]*)/>'),
-                       lambda x: x.group(1) + ' />'),
-                      (re.compile('<!\s+([^<>]*)>'),
-                       lambda x: '<!' + x.group(1) + '>')
-                      ]
-
-    ROOT_TAG_NAME = u'[document]'
-
-    HTML_ENTITIES = "html"
-    XML_ENTITIES = "xml"
-    XHTML_ENTITIES = "xhtml"
-    # TODO: This only exists for backwards-compatibility
-    ALL_ENTITIES = XHTML_ENTITIES
-
-    # Used when determining whether a text node is all whitespace and
-    # can be replaced with a single space. A text node that contains
-    # fancy Unicode spaces (usually non-breaking) should be left
-    # alone.
-    STRIP_ASCII_SPACES = { 9: None, 10: None, 12: None, 13: None, 32: None, }
-
-    def __init__(self, markup="", parseOnlyThese=None, fromEncoding=None,
-                 markupMassage=True, smartQuotesTo=XML_ENTITIES,
-                 convertEntities=None, selfClosingTags=None, isHTML=False):
-        """The Soup object is initialized as the 'root tag', and the
-        provided markup (which can be a string or a file-like object)
-        is fed into the underlying parser.
-
-        sgmllib will process most bad HTML, and the BeautifulSoup
-        class has some tricks for dealing with some HTML that kills
-        sgmllib, but Beautiful Soup can nonetheless choke or lose data
-        if your data uses self-closing tags or declarations
-        incorrectly.
-
-        By default, Beautiful Soup uses regexes to sanitize input,
-        avoiding the vast majority of these problems. If the problems
-        don't apply to you, pass in False for markupMassage, and
-        you'll get better performance.
-
-        The default parser massage techniques fix the two most common
-        instances of invalid HTML that choke sgmllib:
-
-         <br/> (No space between name of closing tag and tag close)
-         <! --Comment--> (Extraneous whitespace in declaration)
-
-        You can pass in a custom list of (RE object, replace method)
-        tuples to get Beautiful Soup to scrub your input the way you
-        want."""
-
-        self.parseOnlyThese = parseOnlyThese
-        self.fromEncoding = fromEncoding
-        self.smartQuotesTo = smartQuotesTo
-        self.convertEntities = convertEntities
-        # Set the rules for how we'll deal with the entities we
-        # encounter
-        if self.convertEntities:
-            # It doesn't make sense to convert encoded characters to
-            # entities even while you're converting entities to Unicode.
-            # Just convert it all to Unicode.
-            self.smartQuotesTo = None
-            if convertEntities == self.HTML_ENTITIES:
-                self.convertXMLEntities = False
-                self.convertHTMLEntities = True
-                self.escapeUnrecognizedEntities = True
-            elif convertEntities == self.XHTML_ENTITIES:
-                self.convertXMLEntities = True
-                self.convertHTMLEntities = True
-                self.escapeUnrecognizedEntities = False
-            elif convertEntities == self.XML_ENTITIES:
-                self.convertXMLEntities = True
-                self.convertHTMLEntities = False
-                self.escapeUnrecognizedEntities = False
-        else:
-            self.convertXMLEntities = False
-            self.convertHTMLEntities = False
-            self.escapeUnrecognizedEntities = False
-
-        self.instanceSelfClosingTags = buildTagMap(None, selfClosingTags)
-        SGMLParser.__init__(self)
-
-        if hasattr(markup, 'read'):        # It's a file-type object.
-            markup = markup.read()
-        self.markup = markup
-        self.markupMassage = markupMassage
-        try:
-            self._feed(isHTML=isHTML)
-        except StopParsing:
-            pass
-        self.markup = None                 # The markup can now be GCed
-
-    def convert_charref(self, name):
-        """This method fixes a bug in Python's SGMLParser."""
-        try:
-            n = int(name)
-        except ValueError:
-            return
-        if not 0 <= n <= 127 : # ASCII ends at 127, not 255
-            return
-        return self.convert_codepoint(n)
-
-    def _feed(self, inDocumentEncoding=None, isHTML=False):
-        # Convert the document to Unicode.
-        markup = self.markup
-        if isinstance(markup, unicode):
-            if not hasattr(self, 'originalEncoding'):
-                self.originalEncoding = None
-        else:
-            dammit = UnicodeDammit\
-                     (markup, [self.fromEncoding, inDocumentEncoding],
-                      smartQuotesTo=self.smartQuotesTo, isHTML=isHTML)
-            markup = dammit.unicode
-            self.originalEncoding = dammit.originalEncoding
-            self.declaredHTMLEncoding = dammit.declaredHTMLEncoding
-        if markup:
-            if self.markupMassage:
-                if not hasattr(self.markupMassage, "__iter__"):
-                    self.markupMassage = self.MARKUP_MASSAGE
-                for fix, m in self.markupMassage:
-                    markup = fix.sub(m, markup)
-                # TODO: We get rid of markupMassage so that the
-                # soup object can be deepcopied later on. Some
-                # Python installations can't copy regexes. If anyone
-                # was relying on the existence of markupMassage, this
-                # might cause problems.
-                del(self.markupMassage)
-        self.reset()
-
-        SGMLParser.feed(self, markup)
-        # Close out any unfinished strings and close all the open tags.
-        self.endData()
-        while self.currentTag.name != self.ROOT_TAG_NAME:
-            self.popTag()
-
-    def __getattr__(self, methodName):
-        """This method routes method call requests to either the SGMLParser
-        superclass or the Tag superclass, depending on the method name."""
-        #print "__getattr__ called on %s.%s" % (self.__class__, methodName)
-
-        if methodName.startswith('start_') or methodName.startswith('end_') \
-               or methodName.startswith('do_'):
-            return SGMLParser.__getattr__(self, methodName)
-        elif not methodName.startswith('__'):
-            return Tag.__getattr__(self, methodName)
-        else:
-            raise AttributeError
-
-    def isSelfClosingTag(self, name):
-        """Returns true iff the given string is the name of a
-        self-closing tag according to this parser."""
-        return self.SELF_CLOSING_TAGS.has_key(name) \
-               or self.instanceSelfClosingTags.has_key(name)
-
-    def reset(self):
-        Tag.__init__(self, self, self.ROOT_TAG_NAME)
-        self.hidden = 1
-        SGMLParser.reset(self)
-        self.currentData = []
-        self.currentTag = None
-        self.tagStack = []
-        self.quoteStack = []
-        self.pushTag(self)
-
-    def popTag(self):
-        tag = self.tagStack.pop()
-
-        #print "Pop", tag.name
-        if self.tagStack:
-            self.currentTag = self.tagStack[-1]
-        return self.currentTag
-
-    def pushTag(self, tag):
-        #print "Push", tag.name
-        if self.currentTag:
-            self.currentTag.contents.append(tag)
-        self.tagStack.append(tag)
-        self.currentTag = self.tagStack[-1]
-
-    def endData(self, containerClass=NavigableString):
-        if self.currentData:
-            currentData = u''.join(self.currentData)
-            if (currentData.translate(self.STRIP_ASCII_SPACES) == '' and
-                not set([tag.name for tag in self.tagStack]).intersection(
-                    self.PRESERVE_WHITESPACE_TAGS)):
-                if '\n' in currentData:
-                    currentData = '\n'
-                else:
-                    currentData = ' '
-            self.currentData = []
-            if self.parseOnlyThese and len(self.tagStack) <= 1 and \
-                   (not self.parseOnlyThese.text or \
-                    not self.parseOnlyThese.search(currentData)):
-                return
-            o = containerClass(currentData)
-            o.setup(self.currentTag, self.previous)
-            if self.previous:
-                self.previous.next = o
-            self.previous = o
-            self.currentTag.contents.append(o)
-
-
-    def _popToTag(self, name, inclusivePop=True):
-        """Pops the tag stack up to and including the most recent
-        instance of the given tag. If inclusivePop is false, pops the tag
-        stack up to but *not* including the most recent instqance of
-        the given tag."""
-        #print "Popping to %s" % name
-        if name == self.ROOT_TAG_NAME:
-            return
-
-        numPops = 0
-        mostRecentTag = None
-        for i in range(len(self.tagStack)-1, 0, -1):
-            if name == self.tagStack[i].name:
-                numPops = len(self.tagStack)-i
-                break
-        if not inclusivePop:
-            numPops = numPops - 1
-
-        for i in range(0, numPops):
-            mostRecentTag = self.popTag()
-        return mostRecentTag
-
-    def _smartPop(self, name):
-
-        """We need to pop up to the previous tag of this type, unless
-        one of this tag's nesting reset triggers comes between this
-        tag and the previous tag of this type, OR unless this tag is a
-        generic nesting trigger and another generic nesting trigger
-        comes between this tag and the previous tag of this type.
-
-        Examples:
-         <p>Foo<b>Bar *<p>* should pop to 'p', not 'b'.
-         <p>Foo<table>Bar *<p>* should pop to 'table', not 'p'.
-         <p>Foo<table><tr>Bar *<p>* should pop to 'tr', not 'p'.
-
-         <li><ul><li> *<li>* should pop to 'ul', not the first 'li'.
-         <tr><table><tr> *<tr>* should pop to 'table', not the first 'tr'
-         <td><tr><td> *<td>* should pop to 'tr', not the first 'td'
-        """
-
-        nestingResetTriggers = self.NESTABLE_TAGS.get(name)
-        isNestable = nestingResetTriggers != None
-        isResetNesting = self.RESET_NESTING_TAGS.has_key(name)
-        popTo = None
-        inclusive = True
-        for i in range(len(self.tagStack)-1, 0, -1):
-            p = self.tagStack[i]
-            if (not p or p.name == name) and not isNestable:
-                #Non-nestable tags get popped to the top or to their
-                #last occurance.
-                popTo = name
-                break
-            if (nestingResetTriggers is not None
-                and p.name in nestingResetTriggers) \
-                or (nestingResetTriggers is None and isResetNesting
-                    and self.RESET_NESTING_TAGS.has_key(p.name)):
-
-                #If we encounter one of the nesting reset triggers
-                #peculiar to this tag, or we encounter another tag
-                #that causes nesting to reset, pop up to but not
-                #including that tag.
-                popTo = p.name
-                inclusive = False
-                break
-            p = p.parent
-        if popTo:
-            self._popToTag(popTo, inclusive)
-
-    def unknown_starttag(self, name, attrs, selfClosing=0):
-        #print "Start tag %s: %s" % (name, attrs)
-        if self.quoteStack:
-            #This is not a real tag.
-            #print "<%s> is not real!" % name
-            attrs = ''.join([' %s="%s"' % (x, y) for x, y in attrs])
-            self.handle_data('<%s%s>' % (name, attrs))
-            return
-        self.endData()
-
-        if not self.isSelfClosingTag(name) and not selfClosing:
-            self._smartPop(name)
-
-        if self.parseOnlyThese and len(self.tagStack) <= 1 \
-               and (self.parseOnlyThese.text or not self.parseOnlyThese.searchTag(name, attrs)):
-            return
-
-        tag = Tag(self, name, attrs, self.currentTag, self.previous)
-        if self.previous:
-            self.previous.next = tag
-        self.previous = tag
-        self.pushTag(tag)
-        if selfClosing or self.isSelfClosingTag(name):
-            self.popTag()
-        if name in self.QUOTE_TAGS:
-            #print "Beginning quote (%s)" % name
-            self.quoteStack.append(name)
-            self.literal = 1
-        return tag
-
-    def unknown_endtag(self, name):
-        #print "End tag %s" % name
-        if self.quoteStack and self.quoteStack[-1] != name:
-            #This is not a real end tag.
-            #print "</%s> is not real!" % name
-            self.handle_data('</%s>' % name)
-            return
-        self.endData()
-        self._popToTag(name)
-        if self.quoteStack and self.quoteStack[-1] == name:
-            self.quoteStack.pop()
-            self.literal = (len(self.quoteStack) > 0)
-
-    def handle_data(self, data):
-        self.currentData.append(data)
-
-    def _toStringSubclass(self, text, subclass):
-        """Adds a certain piece of text to the tree as a NavigableString
-        subclass."""
-        self.endData()
-        self.handle_data(text)
-        self.endData(subclass)
-
-    def handle_pi(self, text):
-        """Handle a processing instruction as a ProcessingInstruction
-        object, possibly one with a %SOUP-ENCODING% slot into which an
-        encoding will be plugged later."""
-        if text[:3] == "xml":
-            text = u"xml version='1.0' encoding='%SOUP-ENCODING%'"
-        self._toStringSubclass(text, ProcessingInstruction)
-
-    def handle_comment(self, text):
-        "Handle comments as Comment objects."
-        self._toStringSubclass(text, Comment)
-
-    def handle_charref(self, ref):
-        "Handle character references as data."
-        if self.convertEntities:
-            data = unichr(int(ref))
-        else:
-            data = '&#%s;' % ref
-        self.handle_data(data)
-
-    def handle_entityref(self, ref):
-        """Handle entity references as data, possibly converting known
-        HTML and/or XML entity references to the corresponding Unicode
-        characters."""
-        data = None
-        if self.convertHTMLEntities:
-            try:
-                data = unichr(name2codepoint[ref])
-            except KeyError:
-                pass
-
-        if not data and self.convertXMLEntities:
-                data = self.XML_ENTITIES_TO_SPECIAL_CHARS.get(ref)
-
-        if not data and self.convertHTMLEntities and \
-            not self.XML_ENTITIES_TO_SPECIAL_CHARS.get(ref):
-                # TODO: We've got a problem here. We're told this is
-                # an entity reference, but it's not an XML entity
-                # reference or an HTML entity reference. Nonetheless,
-                # the logical thing to do is to pass it through as an
-                # unrecognized entity reference.
-                #
-                # Except: when the input is "&carol;" this function
-                # will be called with input "carol". When the input is
-                # "AT&T", this function will be called with input
-                # "T". We have no way of knowing whether a semicolon
-                # was present originally, so we don't know whether
-                # this is an unknown entity or just a misplaced
-                # ampersand.
-                #
-                # The more common case is a misplaced ampersand, so I
-                # escape the ampersand and omit the trailing semicolon.
-                data = "&amp;%s" % ref
-        if not data:
-            # This case is different from the one above, because we
-            # haven't already gone through a supposedly comprehensive
-            # mapping of entities to Unicode characters. We might not
-            # have gone through any mapping at all. So the chances are
-            # very high that this is a real entity, and not a
-            # misplaced ampersand.
-            data = "&%s;" % ref
-        self.handle_data(data)
-
-    def handle_decl(self, data):
-        "Handle DOCTYPEs and the like as Declaration objects."
-        self._toStringSubclass(data, Declaration)
-
-    def parse_declaration(self, i):
-        """Treat a bogus SGML declaration as raw data. Treat a CDATA
-        declaration as a CData object."""
-        j = None
-        if self.rawdata[i:i+9] == '<![CDATA[':
-             k = self.rawdata.find(']]>', i)
-             if k == -1:
-                 k = len(self.rawdata)
-             data = self.rawdata[i+9:k]
-             j = k+3
-             self._toStringSubclass(data, CData)
-        else:
-            try:
-                j = SGMLParser.parse_declaration(self, i)
-            except SGMLParseError:
-                toHandle = self.rawdata[i:]
-                self.handle_data(toHandle)
-                j = i + len(toHandle)
-        return j
-
-class BeautifulSoup(BeautifulStoneSoup):
-
-    """This parser knows the following facts about HTML:
-
-    * Some tags have no closing tag and should be interpreted as being
-      closed as soon as they are encountered.
-
-    * The text inside some tags (ie. 'script') may contain tags which
-      are not really part of the document and which should be parsed
-      as text, not tags. If you want to parse the text as tags, you can
-      always fetch it and parse it explicitly.
-
-    * Tag nesting rules:
-
-      Most tags can't be nested at all. For instance, the occurance of
-      a <p> tag should implicitly close the previous <p> tag.
-
-       <p>Para1<p>Para2
-        should be transformed into:
-       <p>Para1</p><p>Para2
-
-      Some tags can be nested arbitrarily. For instance, the occurance
-      of a <blockquote> tag should _not_ implicitly close the previous
-      <blockquote> tag.
-
-       Alice said: <blockquote>Bob said: <blockquote>Blah
-        should NOT be transformed into:
-       Alice said: <blockquote>Bob said: </blockquote><blockquote>Blah
-
-      Some tags can be nested, but the nesting is reset by the
-      interposition of other tags. For instance, a <tr> tag should
-      implicitly close the previous <tr> tag within the same <table>,
-      but not close a <tr> tag in another table.
-
-       <table><tr>Blah<tr>Blah
-        should be transformed into:
-       <table><tr>Blah</tr><tr>Blah
-        but,
-       <tr>Blah<table><tr>Blah
-        should NOT be transformed into
-       <tr>Blah<table></tr><tr>Blah
-
-    Differing assumptions about tag nesting rules are a major source
-    of problems with the BeautifulSoup class. If BeautifulSoup is not
-    treating as nestable a tag your page author treats as nestable,
-    try ICantBelieveItsBeautifulSoup, MinimalSoup, or
-    BeautifulStoneSoup before writing your own subclass."""
-
-    def __init__(self, *args, **kwargs):
-        if not kwargs.has_key('smartQuotesTo'):
-            kwargs['smartQuotesTo'] = self.HTML_ENTITIES
-        kwargs['isHTML'] = True
-        BeautifulStoneSoup.__init__(self, *args, **kwargs)
-
-    SELF_CLOSING_TAGS = buildTagMap(None,
-                                    ('br' , 'hr', 'input', 'img', 'meta',
-                                    'spacer', 'link', 'frame', 'base', 'col'))
-
-    PRESERVE_WHITESPACE_TAGS = set(['pre', 'textarea'])
-
-    QUOTE_TAGS = {'script' : None, 'textarea' : None}
-
-    #According to the HTML standard, each of these inline tags can
-    #contain another tag of the same type. Furthermore, it's common
-    #to actually use these tags this way.
-    NESTABLE_INLINE_TAGS = ('span', 'font', 'q', 'object', 'bdo', 'sub', 'sup',
-                            'center')
-
-    #According to the HTML standard, these block tags can contain
-    #another tag of the same type. Furthermore, it's common
-    #to actually use these tags this way.
-    NESTABLE_BLOCK_TAGS = ('blockquote', 'div', 'fieldset', 'ins', 'del')
-
-    #Lists can contain other lists, but there are restrictions.
-    NESTABLE_LIST_TAGS = { 'ol' : [],
-                           'ul' : [],
-                           'li' : ['ul', 'ol'],
-                           'dl' : [],
-                           'dd' : ['dl'],
-                           'dt' : ['dl'] }
-
-    #Tables can contain other tables, but there are restrictions.
-    NESTABLE_TABLE_TAGS = {'table' : [],
-                           'tr' : ['table', 'tbody', 'tfoot', 'thead'],
-                           'td' : ['tr'],
-                           'th' : ['tr'],
-                           'thead' : ['table'],
-                           'tbody' : ['table'],
-                           'tfoot' : ['table'],
-                           }
-
-    NON_NESTABLE_BLOCK_TAGS = ('address', 'form', 'p', 'pre')
-
-    #If one of these tags is encountered, all tags up to the next tag of
-    #this type are popped.
-    RESET_NESTING_TAGS = buildTagMap(None, NESTABLE_BLOCK_TAGS, 'noscript',
-                                     NON_NESTABLE_BLOCK_TAGS,
-                                     NESTABLE_LIST_TAGS,
-                                     NESTABLE_TABLE_TAGS)
-
-    NESTABLE_TAGS = buildTagMap([], NESTABLE_INLINE_TAGS, NESTABLE_BLOCK_TAGS,
-                                NESTABLE_LIST_TAGS, NESTABLE_TABLE_TAGS)
-
-    # Used to detect the charset in a META tag; see start_meta
-    CHARSET_RE = re.compile("((^|;)\s*charset=)([^;]*)", re.M)
-
-    def start_meta(self, attrs):
-        """Beautiful Soup can detect a charset included in a META tag,
-        try to convert the document to that charset, and re-parse the
-        document from the beginning."""
-        httpEquiv = None
-        contentType = None
-        contentTypeIndex = None
-        tagNeedsEncodingSubstitution = False
-
-        for i in range(0, len(attrs)):
-            key, value = attrs[i]
-            key = key.lower()
-            if key == 'http-equiv':
-                httpEquiv = value
-            elif key == 'content':
-                contentType = value
-                contentTypeIndex = i
-
-        if httpEquiv and contentType: # It's an interesting meta tag.
-            match = self.CHARSET_RE.search(contentType)
-            if match:
-                if (self.declaredHTMLEncoding is not None or
-                    self.originalEncoding == self.fromEncoding):
-                    # An HTML encoding was sniffed while converting
-                    # the document to Unicode, or an HTML encoding was
-                    # sniffed during a previous pass through the
-                    # document, or an encoding was specified
-                    # explicitly and it worked. Rewrite the meta tag.
-                    def rewrite(match):
-                        return match.group(1) + "%SOUP-ENCODING%"
-                    newAttr = self.CHARSET_RE.sub(rewrite, contentType)
-                    attrs[contentTypeIndex] = (attrs[contentTypeIndex][0],
-                                               newAttr)
-                    tagNeedsEncodingSubstitution = True
-                else:
-                    # This is our first pass through the document.
-                    # Go through it again with the encoding information.
-                    newCharset = match.group(3)
-                    if newCharset and newCharset != self.originalEncoding:
-                        self.declaredHTMLEncoding = newCharset
-                        self._feed(self.declaredHTMLEncoding)
-                        raise StopParsing
-                    pass
-        tag = self.unknown_starttag("meta", attrs)
-        if tag and tagNeedsEncodingSubstitution:
-            tag.containsSubstitutions = True
-
-class StopParsing(Exception):
-    pass
-
-class ICantBelieveItsBeautifulSoup(BeautifulSoup):
-
-    """The BeautifulSoup class is oriented towards skipping over
-    common HTML errors like unclosed tags. However, sometimes it makes
-    errors of its own. For instance, consider this fragment:
-
-     <b>Foo<b>Bar</b></b>
-
-    This is perfectly valid (if bizarre) HTML. However, the
-    BeautifulSoup class will implicitly close the first b tag when it
-    encounters the second 'b'. It will think the author wrote
-    "<b>Foo<b>Bar", and didn't close the first 'b' tag, because
-    there's no real-world reason to bold something that's already
-    bold. When it encounters '</b></b>' it will close two more 'b'
-    tags, for a grand total of three tags closed instead of two. This
-    can throw off the rest of your document structure. The same is
-    true of a number of other tags, listed below.
-
-    It's much more common for someone to forget to close a 'b' tag
-    than to actually use nested 'b' tags, and the BeautifulSoup class
-    handles the common case. This class handles the not-co-common
-    case: where you can't believe someone wrote what they did, but
-    it's valid HTML and BeautifulSoup screwed up by assuming it
-    wouldn't be."""
-
-    I_CANT_BELIEVE_THEYRE_NESTABLE_INLINE_TAGS = \
-     ('em', 'big', 'i', 'small', 'tt', 'abbr', 'acronym', 'strong',
-      'cite', 'code', 'dfn', 'kbd', 'samp', 'strong', 'var', 'b',
-      'big')
-
-    I_CANT_BELIEVE_THEYRE_NESTABLE_BLOCK_TAGS = ('noscript',)
-
-    NESTABLE_TAGS = buildTagMap([], BeautifulSoup.NESTABLE_TAGS,
-                                I_CANT_BELIEVE_THEYRE_NESTABLE_BLOCK_TAGS,
-                                I_CANT_BELIEVE_THEYRE_NESTABLE_INLINE_TAGS)
-
-class MinimalSoup(BeautifulSoup):
-    """The MinimalSoup class is for parsing HTML that contains
-    pathologically bad markup. It makes no assumptions about tag
-    nesting, but it does know which tags are self-closing, that
-    <script> tags contain Javascript and should not be parsed, that
-    META tags may contain encoding information, and so on.
-
-    This also makes it better for subclassing than BeautifulStoneSoup
-    or BeautifulSoup."""
-
-    RESET_NESTING_TAGS = buildTagMap('noscript')
-    NESTABLE_TAGS = {}
-
-class BeautifulSOAP(BeautifulStoneSoup):
-    """This class will push a tag with only a single string child into
-    the tag's parent as an attribute. The attribute's name is the tag
-    name, and the value is the string child. An example should give
-    the flavor of the change:
-
-    <foo><bar>baz</bar></foo>
-     =>
-    <foo bar="baz"><bar>baz</bar></foo>
-
-    You can then access fooTag['bar'] instead of fooTag.barTag.string.
-
-    This is, of course, useful for scraping structures that tend to
-    use subelements instead of attributes, such as SOAP messages. Note
-    that it modifies its input, so don't print the modified version
-    out.
-
-    I'm not sure how many people really want to use this class; let me
-    know if you do. Mainly I like the name."""
-
-    def popTag(self):
-        if len(self.tagStack) > 1:
-            tag = self.tagStack[-1]
-            parent = self.tagStack[-2]
-            parent._getAttrMap()
-            if (isinstance(tag, Tag) and len(tag.contents) == 1 and
-                isinstance(tag.contents[0], NavigableString) and
-                not parent.attrMap.has_key(tag.name)):
-                parent[tag.name] = tag.contents[0]
-        BeautifulStoneSoup.popTag(self)
-
-#Enterprise class names! It has come to our attention that some people
-#think the names of the Beautiful Soup parser classes are too silly
-#and "unprofessional" for use in enterprise screen-scraping. We feel
-#your pain! For such-minded folk, the Beautiful Soup Consortium And
-#All-Night Kosher Bakery recommends renaming this file to
-#"RobustParser.py" (or, in cases of extreme enterprisiness,
-#"RobustParserBeanInterface.class") and using the following
-#enterprise-friendly class aliases:
-class RobustXMLParser(BeautifulStoneSoup):
-    pass
-class RobustHTMLParser(BeautifulSoup):
-    pass
-class RobustWackAssHTMLParser(ICantBelieveItsBeautifulSoup):
-    pass
-class RobustInsanelyWackAssHTMLParser(MinimalSoup):
-    pass
-class SimplifyingSOAPParser(BeautifulSOAP):
-    pass
-
-######################################################
+# Copyright (C) 2019 Apple Inc. All rights reserved.
 #
-# Bonus library: Unicode, Dammit
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1.  Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+# 2.  Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
 #
-# This class forces XML data into a standard format (usually to UTF-8
-# or Unicode).  It is heavily based on code from Mark Pilgrim's
-# Universal Feed Parser. It does not rewrite the XML or HTML to
-# reflect a new encoding: that happens in BeautifulStoneSoup.handle_pi
-# (XML) and BeautifulSoup.start_meta (HTML).
+# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-# Autodetects character encodings.
-# Download from http://chardet.feedparser.org/
-try:
-    import chardet
-#    import chardet.constants
-#    chardet.constants._debug = 1
-except ImportError:
-    chardet = None
+import sys
 
-# cjkcodecs and iconv_codec make Python know about more character encodings.
-# Both are available from http://cjkpython.i18n.org/
-# They're built in if you use Python 2.4.
-try:
-    import cjkcodecs.aliases
-except ImportError:
-    pass
-try:
-    import iconv_codec
-except ImportError:
-    pass
+if sys.version_info > (3, 0):
+    import html5lib
+    import webkitpy.thirdparty.autoinstalled.bs4 as bs4
+    from webkitpy.thirdparty.autoinstalled.bs4.builder import builder_registry, TreeBuilder
+    from webkitpy.thirdparty.autoinstalled.bs4.builder._htmlparser import HTMLParserTreeBuilder
 
-class UnicodeDammit:
-    """A class for detecting the encoding of a *ML document and
-    converting it to a Unicode string. If the source encoding is
-    windows-1252, can replace MS smart quotes with their HTML or XML
-    equivalents."""
+    class BeautifulSoup(bs4.BeautifulSoup):
+        HTML_ENTITIES = 'html'
 
-    # This dictionary maps commonly seen values for "charset" in HTML
-    # meta tags to the corresponding Python codec names. It only covers
-    # values that aren't in Python's aliases and can't be determined
-    # by the heuristics in find_codec.
-    CHARSET_ALIASES = { "macintosh" : "mac-roman",
-                        "x-sjis" : "shift-jis" }
+        def __init__(self, *args, **kwargs):
+            if 'convertEntities' in kwargs:
+                del kwargs['convertEntities']
+            if 'parseOnlyThese' in kwargs:
+                kwargs['parse_only'] = kwargs['parseOnlyThese']
+                del kwargs['parseOnlyThese']
+            kwargs['features'] = self.HTML_ENTITIES
+            kwargs['builder'] = HTMLParserTreeBuilder
+            super(BeautifulSoup, self).__init__(*args, **kwargs)
 
-    def __init__(self, markup, overrideEncodings=[],
-                 smartQuotesTo='xml', isHTML=False):
-        self.declaredHTMLEncoding = None
-        self.markup, documentEncoding, sniffedEncoding = \
-                     self._detectEncoding(markup, isHTML)
-        self.smartQuotesTo = smartQuotesTo
-        self.triedEncodings = []
-        if markup == '' or isinstance(markup, unicode):
-            self.originalEncoding = None
-            self.unicode = unicode(markup)
-            return
+    class BeautifulStoneSoup(bs4.BeautifulSoup):
+        XML_ENTITIES = 'xml'
 
-        u = None
-        for proposedEncoding in overrideEncodings:
-            u = self._convertFrom(proposedEncoding)
-            if u: break
-        if not u:
-            for proposedEncoding in (documentEncoding, sniffedEncoding):
-                u = self._convertFrom(proposedEncoding)
-                if u: break
+        def __init__(self, *args, **kwargs):
+            if 'convertEntities' in kwargs:
+                del kwargs['convertEntities']
+            kwargs['features'] = self.XML_ENTITIES
 
-        # If no luck and we have auto-detection library, try that:
-        if not u and chardet and not isinstance(self.markup, unicode):
-            u = self._convertFrom(chardet.detect(self.markup)['encoding'])
+            # FIXME: This hack isn't strictly accurate, but getting lxml to work with the autoinstaller is a non-trivial task
+            kwargs['builder'] = HTMLParserTreeBuilder
+            super(BeautifulStoneSoup, self).__init__(*args, **kwargs)
 
-        # As a last resort, try utf-8 and windows-1252:
-        if not u:
-            for proposed_encoding in ("utf-8", "windows-1252"):
-                u = self._convertFrom(proposed_encoding)
-                if u: break
-
-        self.unicode = u
-        if not u: self.originalEncoding = None
-
-    def _subMSChar(self, orig):
-        """Changes a MS smart quote character to an XML or HTML
-        entity."""
-        sub = self.MS_CHARS.get(orig)
-        if isinstance(sub, tuple):
-            if self.smartQuotesTo == 'xml':
-                sub = '&#x%s;' % sub[1]
-            else:
-                sub = '&%s;' % sub[0]
-        return sub
-
-    def _convertFrom(self, proposed):
-        proposed = self.find_codec(proposed)
-        if not proposed or proposed in self.triedEncodings:
-            return None
-        self.triedEncodings.append(proposed)
-        markup = self.markup
-
-        # Convert smart quotes to HTML if coming from an encoding
-        # that might have them.
-        if self.smartQuotesTo and proposed.lower() in("windows-1252",
-                                                      "iso-8859-1",
-                                                      "iso-8859-2"):
-            markup = re.compile("([\x80-\x9f])").sub \
-                     (lambda(x): self._subMSChar(x.group(1)),
-                      markup)
-
-        try:
-            # print "Trying to convert document to %s" % proposed
-            u = self._toUnicode(markup, proposed)
-            self.markup = u
-            self.originalEncoding = proposed
-        except Exception, e:
-            # print "That didn't work!"
-            # print e
-            return None
-        #print "Correct encoding: %s" % proposed
-        return self.markup
-
-    def _toUnicode(self, data, encoding):
-        '''Given a string and its encoding, decodes the string into Unicode.
-        %encoding is a string recognized by encodings.aliases'''
-
-        # strip Byte Order Mark (if present)
-        if (len(data) >= 4) and (data[:2] == '\xfe\xff') \
-               and (data[2:4] != '\x00\x00'):
-            encoding = 'utf-16be'
-            data = data[2:]
-        elif (len(data) >= 4) and (data[:2] == '\xff\xfe') \
-                 and (data[2:4] != '\x00\x00'):
-            encoding = 'utf-16le'
-            data = data[2:]
-        elif data[:3] == '\xef\xbb\xbf':
-            encoding = 'utf-8'
-            data = data[3:]
-        elif data[:4] == '\x00\x00\xfe\xff':
-            encoding = 'utf-32be'
-            data = data[4:]
-        elif data[:4] == '\xff\xfe\x00\x00':
-            encoding = 'utf-32le'
-            data = data[4:]
-        newdata = unicode(data, encoding)
-        return newdata
-
-    def _detectEncoding(self, xml_data, isHTML=False):
-        """Given a document, tries to detect its XML encoding."""
-        xml_encoding = sniffed_xml_encoding = None
-        try:
-            if xml_data[:4] == '\x4c\x6f\xa7\x94':
-                # EBCDIC
-                xml_data = self._ebcdic_to_ascii(xml_data)
-            elif xml_data[:4] == '\x00\x3c\x00\x3f':
-                # UTF-16BE
-                sniffed_xml_encoding = 'utf-16be'
-                xml_data = unicode(xml_data, 'utf-16be').encode('utf-8')
-            elif (len(xml_data) >= 4) and (xml_data[:2] == '\xfe\xff') \
-                     and (xml_data[2:4] != '\x00\x00'):
-                # UTF-16BE with BOM
-                sniffed_xml_encoding = 'utf-16be'
-                xml_data = unicode(xml_data[2:], 'utf-16be').encode('utf-8')
-            elif xml_data[:4] == '\x3c\x00\x3f\x00':
-                # UTF-16LE
-                sniffed_xml_encoding = 'utf-16le'
-                xml_data = unicode(xml_data, 'utf-16le').encode('utf-8')
-            elif (len(xml_data) >= 4) and (xml_data[:2] == '\xff\xfe') and \
-                     (xml_data[2:4] != '\x00\x00'):
-                # UTF-16LE with BOM
-                sniffed_xml_encoding = 'utf-16le'
-                xml_data = unicode(xml_data[2:], 'utf-16le').encode('utf-8')
-            elif xml_data[:4] == '\x00\x00\x00\x3c':
-                # UTF-32BE
-                sniffed_xml_encoding = 'utf-32be'
-                xml_data = unicode(xml_data, 'utf-32be').encode('utf-8')
-            elif xml_data[:4] == '\x3c\x00\x00\x00':
-                # UTF-32LE
-                sniffed_xml_encoding = 'utf-32le'
-                xml_data = unicode(xml_data, 'utf-32le').encode('utf-8')
-            elif xml_data[:4] == '\x00\x00\xfe\xff':
-                # UTF-32BE with BOM
-                sniffed_xml_encoding = 'utf-32be'
-                xml_data = unicode(xml_data[4:], 'utf-32be').encode('utf-8')
-            elif xml_data[:4] == '\xff\xfe\x00\x00':
-                # UTF-32LE with BOM
-                sniffed_xml_encoding = 'utf-32le'
-                xml_data = unicode(xml_data[4:], 'utf-32le').encode('utf-8')
-            elif xml_data[:3] == '\xef\xbb\xbf':
-                # UTF-8 with BOM
-                sniffed_xml_encoding = 'utf-8'
-                xml_data = unicode(xml_data[3:], 'utf-8').encode('utf-8')
-            else:
-                sniffed_xml_encoding = 'ascii'
-                pass
-        except:
-            xml_encoding_match = None
-        xml_encoding_match = re.compile(
-            '^<\?.*encoding=[\'"](.*?)[\'"].*\?>').match(xml_data)
-        if not xml_encoding_match and isHTML:
-            regexp = re.compile('<\s*meta[^>]+charset=([^>]*?)[;\'">]', re.I)
-            xml_encoding_match = regexp.search(xml_data)
-        if xml_encoding_match is not None:
-            xml_encoding = xml_encoding_match.groups()[0].lower()
-            if isHTML:
-                self.declaredHTMLEncoding = xml_encoding
-            if sniffed_xml_encoding and \
-               (xml_encoding in ('iso-10646-ucs-2', 'ucs-2', 'csunicode',
-                                 'iso-10646-ucs-4', 'ucs-4', 'csucs4',
-                                 'utf-16', 'utf-32', 'utf_16', 'utf_32',
-                                 'utf16', 'u16')):
-                xml_encoding = sniffed_xml_encoding
-        return xml_data, xml_encoding, sniffed_xml_encoding
-
-
-    def find_codec(self, charset):
-        return self._codec(self.CHARSET_ALIASES.get(charset, charset)) \
-               or (charset and self._codec(charset.replace("-", ""))) \
-               or (charset and self._codec(charset.replace("-", "_"))) \
-               or charset
-
-    def _codec(self, charset):
-        if not charset: return charset
-        codec = None
-        try:
-            codecs.lookup(charset)
-            codec = charset
-        except (LookupError, ValueError):
-            pass
-        return codec
-
-    EBCDIC_TO_ASCII_MAP = None
-    def _ebcdic_to_ascii(self, s):
-        c = self.__class__
-        if not c.EBCDIC_TO_ASCII_MAP:
-            emap = (0,1,2,3,156,9,134,127,151,141,142,11,12,13,14,15,
-                    16,17,18,19,157,133,8,135,24,25,146,143,28,29,30,31,
-                    128,129,130,131,132,10,23,27,136,137,138,139,140,5,6,7,
-                    144,145,22,147,148,149,150,4,152,153,154,155,20,21,158,26,
-                    32,160,161,162,163,164,165,166,167,168,91,46,60,40,43,33,
-                    38,169,170,171,172,173,174,175,176,177,93,36,42,41,59,94,
-                    45,47,178,179,180,181,182,183,184,185,124,44,37,95,62,63,
-                    186,187,188,189,190,191,192,193,194,96,58,35,64,39,61,34,
-                    195,97,98,99,100,101,102,103,104,105,196,197,198,199,200,
-                    201,202,106,107,108,109,110,111,112,113,114,203,204,205,
-                    206,207,208,209,126,115,116,117,118,119,120,121,122,210,
-                    211,212,213,214,215,216,217,218,219,220,221,222,223,224,
-                    225,226,227,228,229,230,231,123,65,66,67,68,69,70,71,72,
-                    73,232,233,234,235,236,237,125,74,75,76,77,78,79,80,81,
-                    82,238,239,240,241,242,243,92,159,83,84,85,86,87,88,89,
-                    90,244,245,246,247,248,249,48,49,50,51,52,53,54,55,56,57,
-                    250,251,252,253,254,255)
-            import string
-            c.EBCDIC_TO_ASCII_MAP = string.maketrans( \
-            ''.join(map(chr, range(256))), ''.join(map(chr, emap)))
-        return s.translate(c.EBCDIC_TO_ASCII_MAP)
-
-    MS_CHARS = { '\x80' : ('euro', '20AC'),
-                 '\x81' : ' ',
-                 '\x82' : ('sbquo', '201A'),
-                 '\x83' : ('fnof', '192'),
-                 '\x84' : ('bdquo', '201E'),
-                 '\x85' : ('hellip', '2026'),
-                 '\x86' : ('dagger', '2020'),
-                 '\x87' : ('Dagger', '2021'),
-                 '\x88' : ('circ', '2C6'),
-                 '\x89' : ('permil', '2030'),
-                 '\x8A' : ('Scaron', '160'),
-                 '\x8B' : ('lsaquo', '2039'),
-                 '\x8C' : ('OElig', '152'),
-                 '\x8D' : '?',
-                 '\x8E' : ('#x17D', '17D'),
-                 '\x8F' : '?',
-                 '\x90' : '?',
-                 '\x91' : ('lsquo', '2018'),
-                 '\x92' : ('rsquo', '2019'),
-                 '\x93' : ('ldquo', '201C'),
-                 '\x94' : ('rdquo', '201D'),
-                 '\x95' : ('bull', '2022'),
-                 '\x96' : ('ndash', '2013'),
-                 '\x97' : ('mdash', '2014'),
-                 '\x98' : ('tilde', '2DC'),
-                 '\x99' : ('trade', '2122'),
-                 '\x9a' : ('scaron', '161'),
-                 '\x9b' : ('rsaquo', '203A'),
-                 '\x9c' : ('oelig', '153'),
-                 '\x9d' : '?',
-                 '\x9e' : ('#x17E', '17E'),
-                 '\x9f' : ('Yuml', ''),}
-
-#######################################################################
-
-
-#By default, act as an HTML pretty-printer.
-if __name__ == '__main__':
-    import sys
-    soup = BeautifulSoup(sys.stdin)
-    print soup.prettify()
+    SoupStrainer = bs4.SoupStrainer
+else:
+    from webkitpy.thirdparty.BeautifulSoup_legacy import BeautifulSoup, BeautifulStoneSoup, SoupStrainer
diff --git a/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup_legacy.py b/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup_legacy.py
new file mode 100644
index 0000000..4b17b85
--- /dev/null
+++ b/Tools/Scripts/webkitpy/thirdparty/BeautifulSoup_legacy.py
@@ -0,0 +1,2014 @@
+"""Beautiful Soup
+Elixir and Tonic
+"The Screen-Scraper's Friend"
+http://www.crummy.com/software/BeautifulSoup/
+
+Beautiful Soup parses a (possibly invalid) XML or HTML document into a
+tree representation. It provides methods and Pythonic idioms that make
+it easy to navigate, search, and modify the tree.
+
+A well-formed XML/HTML document yields a well-formed data
+structure. An ill-formed XML/HTML document yields a correspondingly
+ill-formed data structure. If your document is only locally
+well-formed, you can use this library to find and process the
+well-formed part of it.
+
+Beautiful Soup works with Python 2.2 and up. It has no external
+dependencies, but you'll have more success at converting data to UTF-8
+if you also install these three packages:
+
+* chardet, for auto-detecting character encodings
+  http://chardet.feedparser.org/
+* cjkcodecs and iconv_codec, which add more encodings to the ones supported
+  by stock Python.
+  http://cjkpython.i18n.org/
+
+Beautiful Soup defines classes for two main parsing strategies:
+
+ * BeautifulStoneSoup, for parsing XML, SGML, or your domain-specific
+   language that kind of looks like XML.
+
+ * BeautifulSoup, for parsing run-of-the-mill HTML code, be it valid
+   or invalid. This class has web browser-like heuristics for
+   obtaining a sensible parse tree in the face of common HTML errors.
+
+Beautiful Soup also defines a class (UnicodeDammit) for autodetecting
+the encoding of an HTML or XML document, and converting it to
+Unicode. Much of this code is taken from Mark Pilgrim's Universal Feed Parser.
+
+For more than you ever wanted to know about Beautiful Soup, see the
+documentation:
+http://www.crummy.com/software/BeautifulSoup/documentation.html
+
+Here, have some legalese:
+
+Copyright (c) 2004-2010, Leonard Richardson
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above
+    copyright notice, this list of conditions and the following
+    disclaimer in the documentation and/or other materials provided
+    with the distribution.
+
+  * Neither the name of the the Beautiful Soup Consortium and All
+    Night Kosher Bakery nor the names of its contributors may be
+    used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE, DAMMIT.
+
+"""
+from __future__ import generators
+
+__author__ = "Leonard Richardson (leonardr@segfault.org)"
+__version__ = "3.2.0"
+__copyright__ = "Copyright (c) 2004-2010 Leonard Richardson"
+__license__ = "New-style BSD"
+
+from sgmllib import SGMLParser, SGMLParseError
+import codecs
+import markupbase
+import types
+import re
+import sgmllib
+try:
+  from htmlentitydefs import name2codepoint
+except ImportError:
+  name2codepoint = {}
+try:
+    set
+except NameError:
+    from sets import Set as set
+
+#These hacks make Beautiful Soup able to parse XML with namespaces
+sgmllib.tagfind = re.compile('[a-zA-Z][-_.:a-zA-Z0-9]*')
+markupbase._declname_match = re.compile(r'[a-zA-Z][-_.:a-zA-Z0-9]*\s*').match
+
+DEFAULT_OUTPUT_ENCODING = "utf-8"
+
+def _match_css_class(str):
+    """Build a RE to match the given CSS class."""
+    return re.compile(r"(^|.*\s)%s($|\s)" % str)
+
+# First, the classes that represent markup elements.
+
+class PageElement(object):
+    """Contains the navigational information for some part of the page
+    (either a tag or a piece of text)"""
+
+    def setup(self, parent=None, previous=None):
+        """Sets up the initial relations between this element and
+        other elements."""
+        self.parent = parent
+        self.previous = previous
+        self.next = None
+        self.previousSibling = None
+        self.nextSibling = None
+        if self.parent and self.parent.contents:
+            self.previousSibling = self.parent.contents[-1]
+            self.previousSibling.nextSibling = self
+
+    def replaceWith(self, replaceWith):
+        oldParent = self.parent
+        myIndex = self.parent.index(self)
+        if hasattr(replaceWith, "parent")\
+                  and replaceWith.parent is self.parent:
+            # We're replacing this element with one of its siblings.
+            index = replaceWith.parent.index(replaceWith)
+            if index and index < myIndex:
+                # Furthermore, it comes before this element. That
+                # means that when we extract it, the index of this
+                # element will change.
+                myIndex = myIndex - 1
+        self.extract()
+        oldParent.insert(myIndex, replaceWith)
+
+    def replaceWithChildren(self):
+        myParent = self.parent
+        myIndex = self.parent.index(self)
+        self.extract()
+        reversedChildren = list(self.contents)
+        reversedChildren.reverse()
+        for child in reversedChildren:
+            myParent.insert(myIndex, child)
+
+    def extract(self):
+        """Destructively rips this element out of the tree."""
+        if self.parent:
+            try:
+                del self.parent.contents[self.parent.index(self)]
+            except ValueError:
+                pass
+
+        #Find the two elements that would be next to each other if
+        #this element (and any children) hadn't been parsed. Connect
+        #the two.
+        lastChild = self._lastRecursiveChild()
+        nextElement = lastChild.next
+
+        if self.previous:
+            self.previous.next = nextElement
+        if nextElement:
+            nextElement.previous = self.previous
+        self.previous = None
+        lastChild.next = None
+
+        self.parent = None
+        if self.previousSibling:
+            self.previousSibling.nextSibling = self.nextSibling
+        if self.nextSibling:
+            self.nextSibling.previousSibling = self.previousSibling
+        self.previousSibling = self.nextSibling = None
+        return self
+
+    def _lastRecursiveChild(self):
+        "Finds the last element beneath this object to be parsed."
+        lastChild = self
+        while hasattr(lastChild, 'contents') and lastChild.contents:
+            lastChild = lastChild.contents[-1]
+        return lastChild
+
+    def insert(self, position, newChild):
+        if isinstance(newChild, basestring) \
+            and not isinstance(newChild, NavigableString):
+            newChild = NavigableString(newChild)
+
+        position =  min(position, len(self.contents))
+        if hasattr(newChild, 'parent') and newChild.parent is not None:
+            # We're 'inserting' an element that's already one
+            # of this object's children.
+            if newChild.parent is self:
+                index = self.index(newChild)
+                if index > position:
+                    # Furthermore we're moving it further down the
+                    # list of this object's children. That means that
+                    # when we extract this element, our target index
+                    # will jump down one.
+                    position = position - 1
+            newChild.extract()
+
+        newChild.parent = self
+        previousChild = None
+        if position == 0:
+            newChild.previousSibling = None
+            newChild.previous = self
+        else:
+            previousChild = self.contents[position-1]
+            newChild.previousSibling = previousChild
+            newChild.previousSibling.nextSibling = newChild
+            newChild.previous = previousChild._lastRecursiveChild()
+        if newChild.previous:
+            newChild.previous.next = newChild
+
+        newChildsLastElement = newChild._lastRecursiveChild()
+
+        if position >= len(self.contents):
+            newChild.nextSibling = None
+
+            parent = self
+            parentsNextSibling = None
+            while not parentsNextSibling:
+                parentsNextSibling = parent.nextSibling
+                parent = parent.parent
+                if not parent: # This is the last element in the document.
+                    break
+            if parentsNextSibling:
+                newChildsLastElement.next = parentsNextSibling
+            else:
+                newChildsLastElement.next = None
+        else:
+            nextChild = self.contents[position]
+            newChild.nextSibling = nextChild
+            if newChild.nextSibling:
+                newChild.nextSibling.previousSibling = newChild
+            newChildsLastElement.next = nextChild
+
+        if newChildsLastElement.next:
+            newChildsLastElement.next.previous = newChildsLastElement
+        self.contents.insert(position, newChild)
+
+    def append(self, tag):
+        """Appends the given tag to the contents of this tag."""
+        self.insert(len(self.contents), tag)
+
+    def findNext(self, name=None, attrs={}, text=None, **kwargs):
+        """Returns the first item that matches the given criteria and
+        appears after this Tag in the document."""
+        return self._findOne(self.findAllNext, name, attrs, text, **kwargs)
+
+    def findAllNext(self, name=None, attrs={}, text=None, limit=None,
+                    **kwargs):
+        """Returns all items that match the given criteria and appear
+        after this Tag in the document."""
+        return self._findAll(name, attrs, text, limit, self.nextGenerator,
+                             **kwargs)
+
+    def findNextSibling(self, name=None, attrs={}, text=None, **kwargs):
+        """Returns the closest sibling to this Tag that matches the
+        given criteria and appears after this Tag in the document."""
+        return self._findOne(self.findNextSiblings, name, attrs, text,
+                             **kwargs)
+
+    def findNextSiblings(self, name=None, attrs={}, text=None, limit=None,
+                         **kwargs):
+        """Returns the siblings of this Tag that match the given
+        criteria and appear after this Tag in the document."""
+        return self._findAll(name, attrs, text, limit,
+                             self.nextSiblingGenerator, **kwargs)
+    fetchNextSiblings = findNextSiblings # Compatibility with pre-3.x
+
+    def findPrevious(self, name=None, attrs={}, text=None, **kwargs):
+        """Returns the first item that matches the given criteria and
+        appears before this Tag in the document."""
+        return self._findOne(self.findAllPrevious, name, attrs, text, **kwargs)
+
+    def findAllPrevious(self, name=None, attrs={}, text=None, limit=None,
+                        **kwargs):
+        """Returns all items that match the given criteria and appear
+        before this Tag in the document."""
+        return self._findAll(name, attrs, text, limit, self.previousGenerator,
+                           **kwargs)
+    fetchPrevious = findAllPrevious # Compatibility with pre-3.x
+
+    def findPreviousSibling(self, name=None, attrs={}, text=None, **kwargs):
+        """Returns the closest sibling to this Tag that matches the
+        given criteria and appears before this Tag in the document."""
+        return self._findOne(self.findPreviousSiblings, name, attrs, text,
+                             **kwargs)
+
+    def findPreviousSiblings(self, name=None, attrs={}, text=None,
+                             limit=None, **kwargs):
+        """Returns the siblings of this Tag that match the given
+        criteria and appear before this Tag in the document."""
+        return self._findAll(name, attrs, text, limit,
+                             self.previousSiblingGenerator, **kwargs)
+    fetchPreviousSiblings = findPreviousSiblings # Compatibility with pre-3.x
+
+    def findParent(self, name=None, attrs={}, **kwargs):
+        """Returns the closest parent of this Tag that matches the given
+        criteria."""
+        # NOTE: We can't use _findOne because findParents takes a different
+        # set of arguments.
+        r = None
+        l = self.findParents(name, attrs, 1)
+        if l:
+            r = l[0]
+        return r
+
+    def findParents(self, name=None, attrs={}, limit=None, **kwargs):
+        """Returns the parents of this Tag that match the given
+        criteria."""
+
+        return self._findAll(name, attrs, None, limit, self.parentGenerator,
+                             **kwargs)
+    fetchParents = findParents # Compatibility with pre-3.x
+
+    #These methods do the real heavy lifting.
+
+    def _findOne(self, method, name, attrs, text, **kwargs):
+        r = None
+        l = method(name, attrs, text, 1, **kwargs)
+        if l:
+            r = l[0]
+        return r
+
+    def _findAll(self, name, attrs, text, limit, generator, **kwargs):
+        "Iterates over a generator looking for things that match."
+
+        if isinstance(name, SoupStrainer):
+            strainer = name
+        # (Possibly) special case some findAll*(...) searches
+        elif text is None and not limit and not attrs and not kwargs:
+            # findAll*(True)
+            if name is True:
+                return [element for element in generator()
+                        if isinstance(element, Tag)]
+            # findAll*('tag-name')
+            elif isinstance(name, basestring):
+                return [element for element in generator()
+                        if isinstance(element, Tag) and
+                        element.name == name]
+            else:
+                strainer = SoupStrainer(name, attrs, text, **kwargs)
+        # Build a SoupStrainer
+        else:
+            strainer = SoupStrainer(name, attrs, text, **kwargs)
+        results = ResultSet(strainer)
+        g = generator()
+        while True:
+            try:
+                i = g.next()
+            except StopIteration:
+                break
+            if i:
+                found = strainer.search(i)
+                if found:
+                    results.append(found)
+                    if limit and len(results) >= limit:
+                        break
+        return results
+
+    #These Generators can be used to navigate starting from both
+    #NavigableStrings and Tags.
+    def nextGenerator(self):
+        i = self
+        while i is not None:
+            i = i.next
+            yield i
+
+    def nextSiblingGenerator(self):
+        i = self
+        while i is not None:
+            i = i.nextSibling
+            yield i
+
+    def previousGenerator(self):
+        i = self
+        while i is not None:
+            i = i.previous
+            yield i
+
+    def previousSiblingGenerator(self):
+        i = self
+        while i is not None:
+            i = i.previousSibling
+            yield i
+
+    def parentGenerator(self):
+        i = self
+        while i is not None:
+            i = i.parent
+            yield i
+
+    # Utility methods
+    def substituteEncoding(self, str, encoding=None):
+        encoding = encoding or "utf-8"
+        return str.replace("%SOUP-ENCODING%", encoding)
+
+    def toEncoding(self, s, encoding=None):
+        """Encodes an object to a string in some encoding, or to Unicode.
+        ."""
+        if isinstance(s, unicode):
+            if encoding:
+                s = s.encode(encoding)
+        elif isinstance(s, str):
+            if encoding:
+                s = s.encode(encoding)
+            else:
+                s = unicode(s)
+        else:
+            if encoding:
+                s  = self.toEncoding(str(s), encoding)
+            else:
+                s = unicode(s)
+        return s
+
+class NavigableString(unicode, PageElement):
+
+    def __new__(cls, value):
+        """Create a new NavigableString.
+
+        When unpickling a NavigableString, this method is called with
+        the string in DEFAULT_OUTPUT_ENCODING. That encoding needs to be
+        passed in to the superclass's __new__ or the superclass won't know
+        how to handle non-ASCII characters.
+        """
+        if isinstance(value, unicode):
+            return unicode.__new__(cls, value)
+        return unicode.__new__(cls, value, DEFAULT_OUTPUT_ENCODING)
+
+    def __getnewargs__(self):
+        return (NavigableString.__str__(self),)
+
+    def __getattr__(self, attr):
+        """text.string gives you text. This is for backwards
+        compatibility for Navigable*String, but for CData* it lets you
+        get the string without the CData wrapper."""
+        if attr == 'string':
+            return self
+        else:
+            raise AttributeError, "'%s' object has no attribute '%s'" % (self.__class__.__name__, attr)
+
+    def __unicode__(self):
+        return str(self).decode(DEFAULT_OUTPUT_ENCODING)
+
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        if encoding:
+            return self.encode(encoding)
+        else:
+            return self
+
+class CData(NavigableString):
+
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        return "<![CDATA[%s]]>" % NavigableString.__str__(self, encoding)
+
+class ProcessingInstruction(NavigableString):
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        output = self
+        if "%SOUP-ENCODING%" in output:
+            output = self.substituteEncoding(output, encoding)
+        return "<?%s?>" % self.toEncoding(output, encoding)
+
+class Comment(NavigableString):
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        return "<!--%s-->" % NavigableString.__str__(self, encoding)
+
+class Declaration(NavigableString):
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        return "<!%s>" % NavigableString.__str__(self, encoding)
+
+class Tag(PageElement):
+
+    """Represents a found HTML tag with its attributes and contents."""
+
+    def _invert(h):
+        "Cheap function to invert a hash."
+        i = {}
+        for k,v in h.items():
+            i[v] = k
+        return i
+
+    XML_ENTITIES_TO_SPECIAL_CHARS = { "apos" : "'",
+                                      "quot" : '"',
+                                      "amp" : "&",
+                                      "lt" : "<",
+                                      "gt" : ">" }
+
+    XML_SPECIAL_CHARS_TO_ENTITIES = _invert(XML_ENTITIES_TO_SPECIAL_CHARS)
+
+    def _convertEntities(self, match):
+        """Used in a call to re.sub to replace HTML, XML, and numeric
+        entities with the appropriate Unicode characters. If HTML
+        entities are being converted, any unrecognized entities are
+        escaped."""
+        x = match.group(1)
+        if self.convertHTMLEntities and x in name2codepoint:
+            return unichr(name2codepoint[x])
+        elif x in self.XML_ENTITIES_TO_SPECIAL_CHARS:
+            if self.convertXMLEntities:
+                return self.XML_ENTITIES_TO_SPECIAL_CHARS[x]
+            else:
+                return u'&%s;' % x
+        elif len(x) > 0 and x[0] == '#':
+            # Handle numeric entities
+            if len(x) > 1 and x[1] == 'x':
+                return unichr(int(x[2:], 16))
+            else:
+                return unichr(int(x[1:]))
+
+        elif self.escapeUnrecognizedEntities:
+            return u'&amp;%s;' % x
+        else:
+            return u'&%s;' % x
+
+    def __init__(self, parser, name, attrs=None, parent=None,
+                 previous=None):
+        "Basic constructor."
+
+        # We don't actually store the parser object: that lets extracted
+        # chunks be garbage-collected
+        self.parserClass = parser.__class__
+        self.isSelfClosing = parser.isSelfClosingTag(name)
+        self.name = name
+        if attrs is None:
+            attrs = []
+        elif isinstance(attrs, dict):
+            attrs = attrs.items()
+        self.attrs = attrs
+        self.contents = []
+        self.setup(parent, previous)
+        self.hidden = False
+        self.containsSubstitutions = False
+        self.convertHTMLEntities = parser.convertHTMLEntities
+        self.convertXMLEntities = parser.convertXMLEntities
+        self.escapeUnrecognizedEntities = parser.escapeUnrecognizedEntities
+
+        # Convert any HTML, XML, or numeric entities in the attribute values.
+        convert = lambda(k, val): (k,
+                                   re.sub("&(#\d+|#x[0-9a-fA-F]+|\w+);",
+                                          self._convertEntities,
+                                          val))
+        self.attrs = map(convert, self.attrs)
+
+    def getString(self):
+        if (len(self.contents) == 1
+            and isinstance(self.contents[0], NavigableString)):
+            return self.contents[0]
+
+    def setString(self, string):
+        """Replace the contents of the tag with a string"""
+        self.clear()
+        self.append(string)
+
+    string = property(getString, setString)
+
+    def getText(self, separator=u""):
+        if not len(self.contents):
+            return u""
+        stopNode = self._lastRecursiveChild().next
+        strings = []
+        current = self.contents[0]
+        while current is not stopNode:
+            if isinstance(current, NavigableString):
+                strings.append(current.strip())
+            current = current.next
+        return separator.join(strings)
+
+    text = property(getText)
+
+    def get(self, key, default=None):
+        """Returns the value of the 'key' attribute for the tag, or
+        the value given for 'default' if it doesn't have that
+        attribute."""
+        return self._getAttrMap().get(key, default)
+
+    def clear(self):
+        """Extract all children."""
+        for child in self.contents[:]:
+            child.extract()
+
+    def index(self, element):
+        for i, child in enumerate(self.contents):
+            if child is element:
+                return i
+        raise ValueError("Tag.index: element not in tag")
+
+    def has_key(self, key):
+        return self._getAttrMap().has_key(key)
+
+    def __getitem__(self, key):
+        """tag[key] returns the value of the 'key' attribute for the tag,
+        and throws an exception if it's not there."""
+        return self._getAttrMap()[key]
+
+    def __iter__(self):
+        "Iterating over a tag iterates over its contents."
+        return iter(self.contents)
+
+    def __len__(self):
+        "The length of a tag is the length of its list of contents."
+        return len(self.contents)
+
+    def __contains__(self, x):
+        return x in self.contents
+
+    def __nonzero__(self):
+        "A tag is non-None even if it has no contents."
+        return True
+
+    def __setitem__(self, key, value):
+        """Setting tag[key] sets the value of the 'key' attribute for the
+        tag."""
+        self._getAttrMap()
+        self.attrMap[key] = value
+        found = False
+        for i in range(0, len(self.attrs)):
+            if self.attrs[i][0] == key:
+                self.attrs[i] = (key, value)
+                found = True
+        if not found:
+            self.attrs.append((key, value))
+        self._getAttrMap()[key] = value
+
+    def __delitem__(self, key):
+        "Deleting tag[key] deletes all 'key' attributes for the tag."
+        for item in self.attrs:
+            if item[0] == key:
+                self.attrs.remove(item)
+                #We don't break because bad HTML can define the same
+                #attribute multiple times.
+            self._getAttrMap()
+            if self.attrMap.has_key(key):
+                del self.attrMap[key]
+
+    def __call__(self, *args, **kwargs):
+        """Calling a tag like a function is the same as calling its
+        findAll() method. Eg. tag('a') returns a list of all the A tags
+        found within this tag."""
+        return apply(self.findAll, args, kwargs)
+
+    def __getattr__(self, tag):
+        #print "Getattr %s.%s" % (self.__class__, tag)
+        if len(tag) > 3 and tag.rfind('Tag') == len(tag)-3:
+            return self.find(tag[:-3])
+        elif tag.find('__') != 0:
+            return self.find(tag)
+        raise AttributeError, "'%s' object has no attribute '%s'" % (self.__class__, tag)
+
+    def __eq__(self, other):
+        """Returns true iff this tag has the same name, the same attributes,
+        and the same contents (recursively) as the given tag.
+
+        NOTE: right now this will return false if two tags have the
+        same attributes in a different order. Should this be fixed?"""
+        if other is self:
+            return True
+        if not hasattr(other, 'name') or not hasattr(other, 'attrs') or not hasattr(other, 'contents') or self.name != other.name or self.attrs != other.attrs or len(self) != len(other):
+            return False
+        for i in range(0, len(self.contents)):
+            if self.contents[i] != other.contents[i]:
+                return False
+        return True
+
+    def __ne__(self, other):
+        """Returns true iff this tag is not identical to the other tag,
+        as defined in __eq__."""
+        return not self == other
+
+    def __repr__(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        """Renders this tag as a string."""
+        return self.__str__(encoding)
+
+    def __unicode__(self):
+        return self.__str__(None)
+
+    BARE_AMPERSAND_OR_BRACKET = re.compile("([<>]|"
+                                           + "&(?!#\d+;|#x[0-9a-fA-F]+;|\w+;)"
+                                           + ")")
+
+    def _sub_entity(self, x):
+        """Used with a regular expression to substitute the
+        appropriate XML entity for an XML special character."""
+        return "&" + self.XML_SPECIAL_CHARS_TO_ENTITIES[x.group(0)[0]] + ";"
+
+    def __str__(self, encoding=DEFAULT_OUTPUT_ENCODING,
+                prettyPrint=False, indentLevel=0):
+        """Returns a string or Unicode representation of this tag and
+        its contents. To get Unicode, pass None for encoding.
+
+        NOTE: since Python's HTML parser consumes whitespace, this
+        method is not certain to reproduce the whitespace present in
+        the original string."""
+
+        encodedName = self.toEncoding(self.name, encoding)
+
+        attrs = []
+        if self.attrs:
+            for key, val in self.attrs:
+                fmt = '%s="%s"'
+                if isinstance(val, basestring):
+                    if self.containsSubstitutions and '%SOUP-ENCODING%' in val:
+                        val = self.substituteEncoding(val, encoding)
+
+                    # The attribute value either:
+                    #
+                    # * Contains no embedded double quotes or single quotes.
+                    #   No problem: we enclose it in double quotes.
+                    # * Contains embedded single quotes. No problem:
+                    #   double quotes work here too.
+                    # * Contains embedded double quotes. No problem:
+                    #   we enclose it in single quotes.
+                    # * Embeds both single _and_ double quotes. This
+                    #   can't happen naturally, but it can happen if
+                    #   you modify an attribute value after parsing
+                    #   the document. Now we have a bit of a
+                    #   problem. We solve it by enclosing the
+                    #   attribute in single quotes, and escaping any
+                    #   embedded single quotes to XML entities.
+                    if '"' in val:
+                        fmt = "%s='%s'"
+                        if "'" in val:
+                            # TODO: replace with apos when
+                            # appropriate.
+                            val = val.replace("'", "&squot;")
+
+                    # Now we're okay w/r/t quotes. But the attribute
+                    # value might also contain angle brackets, or
+                    # ampersands that aren't part of entities. We need
+                    # to escape those to XML entities too.
+                    val = self.BARE_AMPERSAND_OR_BRACKET.sub(self._sub_entity, val)
+
+                attrs.append(fmt % (self.toEncoding(key, encoding),
+                                    self.toEncoding(val, encoding)))
+        close = ''
+        closeTag = ''
+        if self.isSelfClosing:
+            close = ' /'
+        else:
+            closeTag = '</%s>' % encodedName
+
+        indentTag, indentContents = 0, 0
+        if prettyPrint:
+            indentTag = indentLevel
+            space = (' ' * (indentTag-1))
+            indentContents = indentTag + 1
+        contents = self.renderContents(encoding, prettyPrint, indentContents)
+        if self.hidden:
+            s = contents
+        else:
+            s = []
+            attributeString = ''
+            if attrs:
+                attributeString = ' ' + ' '.join(attrs)
+            if prettyPrint:
+                s.append(space)
+            s.append('<%s%s%s>' % (encodedName, attributeString, close))
+            if prettyPrint:
+                s.append("\n")
+            s.append(contents)
+            if prettyPrint and contents and contents[-1] != "\n":
+                s.append("\n")
+            if prettyPrint and closeTag:
+                s.append(space)
+            s.append(closeTag)
+            if prettyPrint and closeTag and self.nextSibling:
+                s.append("\n")
+            s = ''.join(s)
+        return s
+
+    def decompose(self):
+        """Recursively destroys the contents of this tree."""
+        self.extract()
+        if len(self.contents) == 0:
+            return
+        current = self.contents[0]
+        while current is not None:
+            next = current.next
+            if isinstance(current, Tag):
+                del current.contents[:]
+            current.parent = None
+            current.previous = None
+            current.previousSibling = None
+            current.next = None
+            current.nextSibling = None
+            current = next
+
+    def prettify(self, encoding=DEFAULT_OUTPUT_ENCODING):
+        return self.__str__(encoding, True)
+
+    def renderContents(self, encoding=DEFAULT_OUTPUT_ENCODING,
+                       prettyPrint=False, indentLevel=0):
+        """Renders the contents of this tag as a string in the given
+        encoding. If encoding is None, returns a Unicode string.."""
+        s=[]
+        for c in self:
+            text = None
+            if isinstance(c, NavigableString):
+                text = c.__str__(encoding)
+            elif isinstance(c, Tag):
+                s.append(c.__str__(encoding, prettyPrint, indentLevel))
+            if text and prettyPrint:
+                text = text.strip()
+            if text:
+                if prettyPrint:
+                    s.append(" " * (indentLevel-1))
+                s.append(text)
+                if prettyPrint:
+                    s.append("\n")
+        return ''.join(s)
+
+    #Soup methods
+
+    def find(self, name=None, attrs={}, recursive=True, text=None,
+             **kwargs):
+        """Return only the first child of this Tag matching the given
+        criteria."""
+        r = None
+        l = self.findAll(name, attrs, recursive, text, 1, **kwargs)
+        if l:
+            r = l[0]
+        return r
+    findChild = find
+
+    def findAll(self, name=None, attrs={}, recursive=True, text=None,
+                limit=None, **kwargs):
+        """Extracts a list of Tag objects that match the given
+        criteria.  You can specify the name of the Tag and any
+        attributes you want the Tag to have.
+
+        The value of a key-value pair in the 'attrs' map can be a
+        string, a list of strings, a regular expression object, or a
+        callable that takes a string and returns whether or not the
+        string matches for some custom definition of 'matches'. The
+        same is true of the tag name."""
+        generator = self.recursiveChildGenerator
+        if not recursive:
+            generator = self.childGenerator
+        return self._findAll(name, attrs, text, limit, generator, **kwargs)
+    findChildren = findAll
+
+    # Pre-3.x compatibility methods
+    first = find
+    fetch = findAll
+
+    def fetchText(self, text=None, recursive=True, limit=None):
+        return self.findAll(text=text, recursive=recursive, limit=limit)
+
+    def firstText(self, text=None, recursive=True):
+        return self.find(text=text, recursive=recursive)
+
+    #Private methods
+
+    def _getAttrMap(self):
+        """Initializes a map representation of this tag's attributes,
+        if not already initialized."""
+        if not getattr(self, 'attrMap'):
+            self.attrMap = {}
+            for (key, value) in self.attrs:
+                self.attrMap[key] = value
+        return self.attrMap
+
+    #Generator methods
+    def childGenerator(self):
+        # Just use the iterator from the contents
+        return iter(self.contents)
+
+    def recursiveChildGenerator(self):
+        if not len(self.contents):
+            raise StopIteration
+        stopNode = self._lastRecursiveChild().next
+        current = self.contents[0]
+        while current is not stopNode:
+            yield current
+            current = current.next
+
+
+# Next, a couple classes to represent queries and their results.
+class SoupStrainer:
+    """Encapsulates a number of ways of matching a markup element (tag or
+    text)."""
+
+    def __init__(self, name=None, attrs={}, text=None, **kwargs):
+        self.name = name
+        if isinstance(attrs, basestring):
+            kwargs['class'] = _match_css_class(attrs)
+            attrs = None
+        if kwargs:
+            if attrs:
+                attrs = attrs.copy()
+                attrs.update(kwargs)
+            else:
+                attrs = kwargs
+        self.attrs = attrs
+        self.text = text
+
+    def __str__(self):
+        if self.text:
+            return self.text
+        else:
+            return "%s|%s" % (self.name, self.attrs)
+
+    def searchTag(self, markupName=None, markupAttrs={}):
+        found = None
+        markup = None
+        if isinstance(markupName, Tag):
+            markup = markupName
+            markupAttrs = markup
+        callFunctionWithTagData = callable(self.name) \
+                                and not isinstance(markupName, Tag)
+
+        if (not self.name) \
+               or callFunctionWithTagData \
+               or (markup and self._matches(markup, self.name)) \
+               or (not markup and self._matches(markupName, self.name)):
+            if callFunctionWithTagData:
+                match = self.name(markupName, markupAttrs)
+            else:
+                match = True
+                markupAttrMap = None
+                for attr, matchAgainst in self.attrs.items():
+                    if not markupAttrMap:
+                         if hasattr(markupAttrs, 'get'):
+                            markupAttrMap = markupAttrs
+                         else:
+                            markupAttrMap = {}
+                            for k,v in markupAttrs:
+                                markupAttrMap[k] = v
+                    attrValue = markupAttrMap.get(attr)
+                    if not self._matches(attrValue, matchAgainst):
+                        match = False
+                        break
+            if match:
+                if markup:
+                    found = markup
+                else:
+                    found = markupName
+        return found
+
+    def search(self, markup):
+        #print 'looking for %s in %s' % (self, markup)
+        found = None
+        # If given a list of items, scan it for a text element that
+        # matches.
+        if hasattr(markup, "__iter__") \
+                and not isinstance(markup, Tag):
+            for element in markup:
+                if isinstance(element, NavigableString) \
+                       and self.search(element):
+                    found = element
+                    break
+        # If it's a Tag, make sure its name or attributes match.
+        # Don't bother with Tags if we're searching for text.
+        elif isinstance(markup, Tag):
+            if not self.text:
+                found = self.searchTag(markup)
+        # If it's text, make sure the text matches.
+        elif isinstance(markup, NavigableString) or \
+                 isinstance(markup, basestring):
+            if self._matches(markup, self.text):
+                found = markup
+        else:
+            raise Exception, "I don't know how to match against a %s" \
+                  % markup.__class__
+        return found
+
+    def _matches(self, markup, matchAgainst):
+        #print "Matching %s against %s" % (markup, matchAgainst)
+        result = False
+        if matchAgainst is True:
+            result = markup is not None
+        elif callable(matchAgainst):
+            result = matchAgainst(markup)
+        else:
+            #Custom match methods take the tag as an argument, but all
+            #other ways of matching match the tag name as a string.
+            if isinstance(markup, Tag):
+                markup = markup.name
+            if markup and not isinstance(markup, basestring):
+                markup = unicode(markup)
+            #Now we know that chunk is either a string, or None.
+            if hasattr(matchAgainst, 'match'):
+                # It's a regexp object.
+                result = markup and matchAgainst.search(markup)
+            elif hasattr(matchAgainst, '__iter__'): # list-like
+                result = markup in matchAgainst
+            elif hasattr(matchAgainst, 'items'):
+                result = markup.has_key(matchAgainst)
+            elif matchAgainst and isinstance(markup, basestring):
+                if isinstance(markup, unicode):
+                    matchAgainst = unicode(matchAgainst)
+                else:
+                    matchAgainst = str(matchAgainst)
+
+            if not result:
+                result = matchAgainst == markup
+        return result
+
+class ResultSet(list):
+    """A ResultSet is just a list that keeps track of the SoupStrainer
+    that created it."""
+    def __init__(self, source):
+        list.__init__([])
+        self.source = source
+
+# Now, some helper functions.
+
+def buildTagMap(default, *args):
+    """Turns a list of maps, lists, or scalars into a single map.
+    Used to build the SELF_CLOSING_TAGS, NESTABLE_TAGS, and
+    NESTING_RESET_TAGS maps out of lists and partial maps."""
+    built = {}
+    for portion in args:
+        if hasattr(portion, 'items'):
+            #It's a map. Merge it.
+            for k,v in portion.items():
+                built[k] = v
+        elif hasattr(portion, '__iter__'): # is a list
+            #It's a list. Map each item to the default.
+            for k in portion:
+                built[k] = default
+        else:
+            #It's a scalar. Map it to the default.
+            built[portion] = default
+    return built
+
+# Now, the parser classes.
+
+class BeautifulStoneSoup(Tag, SGMLParser):
+
+    """This class contains the basic parser and search code. It defines
+    a parser that knows nothing about tag behavior except for the
+    following:
+
+      You can't close a tag without closing all the tags it encloses.
+      That is, "<foo><bar></foo>" actually means
+      "<foo><bar></bar></foo>".
+
+    [Another possible explanation is "<foo><bar /></foo>", but since
+    this class defines no SELF_CLOSING_TAGS, it will never use that
+    explanation.]
+
+    This class is useful for parsing XML or made-up markup languages,
+    or when BeautifulSoup makes an assumption counter to what you were
+    expecting."""
+
+    SELF_CLOSING_TAGS = {}
+    NESTABLE_TAGS = {}
+    RESET_NESTING_TAGS = {}
+    QUOTE_TAGS = {}
+    PRESERVE_WHITESPACE_TAGS = []
+
+    MARKUP_MASSAGE = [(re.compile('(<[^<>]*)/>'),
+                       lambda x: x.group(1) + ' />'),
+                      (re.compile('<!\s+([^<>]*)>'),
+                       lambda x: '<!' + x.group(1) + '>')
+                      ]
+
+    ROOT_TAG_NAME = u'[document]'
+
+    HTML_ENTITIES = "html"
+    XML_ENTITIES = "xml"
+    XHTML_ENTITIES = "xhtml"
+    # TODO: This only exists for backwards-compatibility
+    ALL_ENTITIES = XHTML_ENTITIES
+
+    # Used when determining whether a text node is all whitespace and
+    # can be replaced with a single space. A text node that contains
+    # fancy Unicode spaces (usually non-breaking) should be left
+    # alone.
+    STRIP_ASCII_SPACES = { 9: None, 10: None, 12: None, 13: None, 32: None, }
+
+    def __init__(self, markup="", parseOnlyThese=None, fromEncoding=None,
+                 markupMassage=True, smartQuotesTo=XML_ENTITIES,
+                 convertEntities=None, selfClosingTags=None, isHTML=False):
+        """The Soup object is initialized as the 'root tag', and the
+        provided markup (which can be a string or a file-like object)
+        is fed into the underlying parser.
+
+        sgmllib will process most bad HTML, and the BeautifulSoup
+        class has some tricks for dealing with some HTML that kills
+        sgmllib, but Beautiful Soup can nonetheless choke or lose data
+        if your data uses self-closing tags or declarations
+        incorrectly.
+
+        By default, Beautiful Soup uses regexes to sanitize input,
+        avoiding the vast majority of these problems. If the problems
+        don't apply to you, pass in False for markupMassage, and
+        you'll get better performance.
+
+        The default parser massage techniques fix the two most common
+        instances of invalid HTML that choke sgmllib:
+
+         <br/> (No space between name of closing tag and tag close)
+         <! --Comment--> (Extraneous whitespace in declaration)
+
+        You can pass in a custom list of (RE object, replace method)
+        tuples to get Beautiful Soup to scrub your input the way you
+        want."""
+
+        self.parseOnlyThese = parseOnlyThese
+        self.fromEncoding = fromEncoding
+        self.smartQuotesTo = smartQuotesTo
+        self.convertEntities = convertEntities
+        # Set the rules for how we'll deal with the entities we
+        # encounter
+        if self.convertEntities:
+            # It doesn't make sense to convert encoded characters to
+            # entities even while you're converting entities to Unicode.
+            # Just convert it all to Unicode.
+            self.smartQuotesTo = None
+            if convertEntities == self.HTML_ENTITIES:
+                self.convertXMLEntities = False
+                self.convertHTMLEntities = True
+                self.escapeUnrecognizedEntities = True
+            elif convertEntities == self.XHTML_ENTITIES:
+                self.convertXMLEntities = True
+                self.convertHTMLEntities = True
+                self.escapeUnrecognizedEntities = False
+            elif convertEntities == self.XML_ENTITIES:
+                self.convertXMLEntities = True
+                self.convertHTMLEntities = False
+                self.escapeUnrecognizedEntities = False
+        else:
+            self.convertXMLEntities = False
+            self.convertHTMLEntities = False
+            self.escapeUnrecognizedEntities = False
+
+        self.instanceSelfClosingTags = buildTagMap(None, selfClosingTags)
+        SGMLParser.__init__(self)
+
+        if hasattr(markup, 'read'):        # It's a file-type object.
+            markup = markup.read()
+        self.markup = markup
+        self.markupMassage = markupMassage
+        try:
+            self._feed(isHTML=isHTML)
+        except StopParsing:
+            pass
+        self.markup = None                 # The markup can now be GCed
+
+    def convert_charref(self, name):
+        """This method fixes a bug in Python's SGMLParser."""
+        try:
+            n = int(name)
+        except ValueError:
+            return
+        if not 0 <= n <= 127 : # ASCII ends at 127, not 255
+            return
+        return self.convert_codepoint(n)
+
+    def _feed(self, inDocumentEncoding=None, isHTML=False):
+        # Convert the document to Unicode.
+        markup = self.markup
+        if isinstance(markup, unicode):
+            if not hasattr(self, 'originalEncoding'):
+                self.originalEncoding = None
+        else:
+            dammit = UnicodeDammit\
+                     (markup, [self.fromEncoding, inDocumentEncoding],
+                      smartQuotesTo=self.smartQuotesTo, isHTML=isHTML)
+            markup = dammit.unicode
+            self.originalEncoding = dammit.originalEncoding
+            self.declaredHTMLEncoding = dammit.declaredHTMLEncoding
+        if markup:
+            if self.markupMassage:
+                if not hasattr(self.markupMassage, "__iter__"):
+                    self.markupMassage = self.MARKUP_MASSAGE
+                for fix, m in self.markupMassage:
+                    markup = fix.sub(m, markup)
+                # TODO: We get rid of markupMassage so that the
+                # soup object can be deepcopied later on. Some
+                # Python installations can't copy regexes. If anyone
+                # was relying on the existence of markupMassage, this
+                # might cause problems.
+                del(self.markupMassage)
+        self.reset()
+
+        SGMLParser.feed(self, markup)
+        # Close out any unfinished strings and close all the open tags.
+        self.endData()
+        while self.currentTag.name != self.ROOT_TAG_NAME:
+            self.popTag()
+
+    def __getattr__(self, methodName):
+        """This method routes method call requests to either the SGMLParser
+        superclass or the Tag superclass, depending on the method name."""
+        #print "__getattr__ called on %s.%s" % (self.__class__, methodName)
+
+        if methodName.startswith('start_') or methodName.startswith('end_') \
+               or methodName.startswith('do_'):
+            return SGMLParser.__getattr__(self, methodName)
+        elif not methodName.startswith('__'):
+            return Tag.__getattr__(self, methodName)
+        else:
+            raise AttributeError
+
+    def isSelfClosingTag(self, name):
+        """Returns true iff the given string is the name of a
+        self-closing tag according to this parser."""
+        return self.SELF_CLOSING_TAGS.has_key(name) \
+               or self.instanceSelfClosingTags.has_key(name)
+
+    def reset(self):
+        Tag.__init__(self, self, self.ROOT_TAG_NAME)
+        self.hidden = 1
+        SGMLParser.reset(self)
+        self.currentData = []
+        self.currentTag = None
+        self.tagStack = []
+        self.quoteStack = []
+        self.pushTag(self)
+
+    def popTag(self):
+        tag = self.tagStack.pop()
+
+        #print "Pop", tag.name
+        if self.tagStack:
+            self.currentTag = self.tagStack[-1]
+        return self.currentTag
+
+    def pushTag(self, tag):
+        #print "Push", tag.name
+        if self.currentTag:
+            self.currentTag.contents.append(tag)
+        self.tagStack.append(tag)
+        self.currentTag = self.tagStack[-1]
+
+    def endData(self, containerClass=NavigableString):
+        if self.currentData:
+            currentData = u''.join(self.currentData)
+            if (currentData.translate(self.STRIP_ASCII_SPACES) == '' and
+                not set([tag.name for tag in self.tagStack]).intersection(
+                    self.PRESERVE_WHITESPACE_TAGS)):
+                if '\n' in currentData:
+                    currentData = '\n'
+                else:
+                    currentData = ' '
+            self.currentData = []
+            if self.parseOnlyThese and len(self.tagStack) <= 1 and \
+                   (not self.parseOnlyThese.text or \
+                    not self.parseOnlyThese.search(currentData)):
+                return
+            o = containerClass(currentData)
+            o.setup(self.currentTag, self.previous)
+            if self.previous:
+                self.previous.next = o
+            self.previous = o
+            self.currentTag.contents.append(o)
+
+
+    def _popToTag(self, name, inclusivePop=True):
+        """Pops the tag stack up to and including the most recent
+        instance of the given tag. If inclusivePop is false, pops the tag
+        stack up to but *not* including the most recent instqance of
+        the given tag."""
+        #print "Popping to %s" % name
+        if name == self.ROOT_TAG_NAME:
+            return
+
+        numPops = 0
+        mostRecentTag = None
+        for i in range(len(self.tagStack)-1, 0, -1):
+            if name == self.tagStack[i].name:
+                numPops = len(self.tagStack)-i
+                break
+        if not inclusivePop:
+            numPops = numPops - 1
+
+        for i in range(0, numPops):
+            mostRecentTag = self.popTag()
+        return mostRecentTag
+
+    def _smartPop(self, name):
+
+        """We need to pop up to the previous tag of this type, unless
+        one of this tag's nesting reset triggers comes between this
+        tag and the previous tag of this type, OR unless this tag is a
+        generic nesting trigger and another generic nesting trigger
+        comes between this tag and the previous tag of this type.
+
+        Examples:
+         <p>Foo<b>Bar *<p>* should pop to 'p', not 'b'.
+         <p>Foo<table>Bar *<p>* should pop to 'table', not 'p'.
+         <p>Foo<table><tr>Bar *<p>* should pop to 'tr', not 'p'.
+
+         <li><ul><li> *<li>* should pop to 'ul', not the first 'li'.
+         <tr><table><tr> *<tr>* should pop to 'table', not the first 'tr'
+         <td><tr><td> *<td>* should pop to 'tr', not the first 'td'
+        """
+
+        nestingResetTriggers = self.NESTABLE_TAGS.get(name)
+        isNestable = nestingResetTriggers != None
+        isResetNesting = self.RESET_NESTING_TAGS.has_key(name)
+        popTo = None
+        inclusive = True
+        for i in range(len(self.tagStack)-1, 0, -1):
+            p = self.tagStack[i]
+            if (not p or p.name == name) and not isNestable:
+                #Non-nestable tags get popped to the top or to their
+                #last occurance.
+                popTo = name
+                break
+            if (nestingResetTriggers is not None
+                and p.name in nestingResetTriggers) \
+                or (nestingResetTriggers is None and isResetNesting
+                    and self.RESET_NESTING_TAGS.has_key(p.name)):
+
+                #If we encounter one of the nesting reset triggers
+                #peculiar to this tag, or we encounter another tag
+                #that causes nesting to reset, pop up to but not
+                #including that tag.
+                popTo = p.name
+                inclusive = False
+                break
+            p = p.parent
+        if popTo:
+            self._popToTag(popTo, inclusive)
+
+    def unknown_starttag(self, name, attrs, selfClosing=0):
+        #print "Start tag %s: %s" % (name, attrs)
+        if self.quoteStack:
+            #This is not a real tag.
+            #print "<%s> is not real!" % name
+            attrs = ''.join([' %s="%s"' % (x, y) for x, y in attrs])
+            self.handle_data('<%s%s>' % (name, attrs))
+            return
+        self.endData()
+
+        if not self.isSelfClosingTag(name) and not selfClosing:
+            self._smartPop(name)
+
+        if self.parseOnlyThese and len(self.tagStack) <= 1 \
+               and (self.parseOnlyThese.text or not self.parseOnlyThese.searchTag(name, attrs)):
+            return
+
+        tag = Tag(self, name, attrs, self.currentTag, self.previous)
+        if self.previous:
+            self.previous.next = tag
+        self.previous = tag
+        self.pushTag(tag)
+        if selfClosing or self.isSelfClosingTag(name):
+            self.popTag()
+        if name in self.QUOTE_TAGS:
+            #print "Beginning quote (%s)" % name
+            self.quoteStack.append(name)
+            self.literal = 1
+        return tag
+
+    def unknown_endtag(self, name):
+        #print "End tag %s" % name
+        if self.quoteStack and self.quoteStack[-1] != name:
+            #This is not a real end tag.
+            #print "</%s> is not real!" % name
+            self.handle_data('</%s>' % name)
+            return
+        self.endData()
+        self._popToTag(name)
+        if self.quoteStack and self.quoteStack[-1] == name:
+            self.quoteStack.pop()
+            self.literal = (len(self.quoteStack) > 0)
+
+    def handle_data(self, data):
+        self.currentData.append(data)
+
+    def _toStringSubclass(self, text, subclass):
+        """Adds a certain piece of text to the tree as a NavigableString
+        subclass."""
+        self.endData()
+        self.handle_data(text)
+        self.endData(subclass)
+
+    def handle_pi(self, text):
+        """Handle a processing instruction as a ProcessingInstruction
+        object, possibly one with a %SOUP-ENCODING% slot into which an
+        encoding will be plugged later."""
+        if text[:3] == "xml":
+            text = u"xml version='1.0' encoding='%SOUP-ENCODING%'"
+        self._toStringSubclass(text, ProcessingInstruction)
+
+    def handle_comment(self, text):
+        "Handle comments as Comment objects."
+        self._toStringSubclass(text, Comment)
+
+    def handle_charref(self, ref):
+        "Handle character references as data."
+        if self.convertEntities:
+            data = unichr(int(ref))
+        else:
+            data = '&#%s;' % ref
+        self.handle_data(data)
+
+    def handle_entityref(self, ref):
+        """Handle entity references as data, possibly converting known
+        HTML and/or XML entity references to the corresponding Unicode
+        characters."""
+        data = None
+        if self.convertHTMLEntities:
+            try:
+                data = unichr(name2codepoint[ref])
+            except KeyError:
+                pass
+
+        if not data and self.convertXMLEntities:
+                data = self.XML_ENTITIES_TO_SPECIAL_CHARS.get(ref)
+
+        if not data and self.convertHTMLEntities and \
+            not self.XML_ENTITIES_TO_SPECIAL_CHARS.get(ref):
+                # TODO: We've got a problem here. We're told this is
+                # an entity reference, but it's not an XML entity
+                # reference or an HTML entity reference. Nonetheless,
+                # the logical thing to do is to pass it through as an
+                # unrecognized entity reference.
+                #
+                # Except: when the input is "&carol;" this function
+                # will be called with input "carol". When the input is
+                # "AT&T", this function will be called with input
+                # "T". We have no way of knowing whether a semicolon
+                # was present originally, so we don't know whether
+                # this is an unknown entity or just a misplaced
+                # ampersand.
+                #
+                # The more common case is a misplaced ampersand, so I
+                # escape the ampersand and omit the trailing semicolon.
+                data = "&amp;%s" % ref
+        if not data:
+            # This case is different from the one above, because we
+            # haven't already gone through a supposedly comprehensive
+            # mapping of entities to Unicode characters. We might not
+            # have gone through any mapping at all. So the chances are
+            # very high that this is a real entity, and not a
+            # misplaced ampersand.
+            data = "&%s;" % ref
+        self.handle_data(data)
+
+    def handle_decl(self, data):
+        "Handle DOCTYPEs and the like as Declaration objects."
+        self._toStringSubclass(data, Declaration)
+
+    def parse_declaration(self, i):
+        """Treat a bogus SGML declaration as raw data. Treat a CDATA
+        declaration as a CData object."""
+        j = None
+        if self.rawdata[i:i+9] == '<![CDATA[':
+             k = self.rawdata.find(']]>', i)
+             if k == -1:
+                 k = len(self.rawdata)
+             data = self.rawdata[i+9:k]
+             j = k+3
+             self._toStringSubclass(data, CData)
+        else:
+            try:
+                j = SGMLParser.parse_declaration(self, i)
+            except SGMLParseError:
+                toHandle = self.rawdata[i:]
+                self.handle_data(toHandle)
+                j = i + len(toHandle)
+        return j
+
+class BeautifulSoup(BeautifulStoneSoup):
+
+    """This parser knows the following facts about HTML:
+
+    * Some tags have no closing tag and should be interpreted as being
+      closed as soon as they are encountered.
+
+    * The text inside some tags (ie. 'script') may contain tags which
+      are not really part of the document and which should be parsed
+      as text, not tags. If you want to parse the text as tags, you can
+      always fetch it and parse it explicitly.
+
+    * Tag nesting rules:
+
+      Most tags can't be nested at all. For instance, the occurance of
+      a <p> tag should implicitly close the previous <p> tag.
+
+       <p>Para1<p>Para2
+        should be transformed into:
+       <p>Para1</p><p>Para2
+
+      Some tags can be nested arbitrarily. For instance, the occurance
+      of a <blockquote> tag should _not_ implicitly close the previous
+      <blockquote> tag.
+
+       Alice said: <blockquote>Bob said: <blockquote>Blah
+        should NOT be transformed into:
+       Alice said: <blockquote>Bob said: </blockquote><blockquote>Blah
+
+      Some tags can be nested, but the nesting is reset by the
+      interposition of other tags. For instance, a <tr> tag should
+      implicitly close the previous <tr> tag within the same <table>,
+      but not close a <tr> tag in another table.
+
+       <table><tr>Blah<tr>Blah
+        should be transformed into:
+       <table><tr>Blah</tr><tr>Blah
+        but,
+       <tr>Blah<table><tr>Blah
+        should NOT be transformed into
+       <tr>Blah<table></tr><tr>Blah
+
+    Differing assumptions about tag nesting rules are a major source
+    of problems with the BeautifulSoup class. If BeautifulSoup is not
+    treating as nestable a tag your page author treats as nestable,
+    try ICantBelieveItsBeautifulSoup, MinimalSoup, or
+    BeautifulStoneSoup before writing your own subclass."""
+
+    def __init__(self, *args, **kwargs):
+        if not kwargs.has_key('smartQuotesTo'):
+            kwargs['smartQuotesTo'] = self.HTML_ENTITIES
+        kwargs['isHTML'] = True
+        BeautifulStoneSoup.__init__(self, *args, **kwargs)
+
+    SELF_CLOSING_TAGS = buildTagMap(None,
+                                    ('br' , 'hr', 'input', 'img', 'meta',
+                                    'spacer', 'link', 'frame', 'base', 'col'))
+
+    PRESERVE_WHITESPACE_TAGS = set(['pre', 'textarea'])
+
+    QUOTE_TAGS = {'script' : None, 'textarea' : None}
+
+    #According to the HTML standard, each of these inline tags can
+    #contain another tag of the same type. Furthermore, it's common
+    #to actually use these tags this way.
+    NESTABLE_INLINE_TAGS = ('span', 'font', 'q', 'object', 'bdo', 'sub', 'sup',
+                            'center')
+
+    #According to the HTML standard, these block tags can contain
+    #another tag of the same type. Furthermore, it's common
+    #to actually use these tags this way.
+    NESTABLE_BLOCK_TAGS = ('blockquote', 'div', 'fieldset', 'ins', 'del')
+
+    #Lists can contain other lists, but there are restrictions.
+    NESTABLE_LIST_TAGS = { 'ol' : [],
+                           'ul' : [],
+                           'li' : ['ul', 'ol'],
+                           'dl' : [],
+                           'dd' : ['dl'],
+                           'dt' : ['dl'] }
+
+    #Tables can contain other tables, but there are restrictions.
+    NESTABLE_TABLE_TAGS = {'table' : [],
+                           'tr' : ['table', 'tbody', 'tfoot', 'thead'],
+                           'td' : ['tr'],
+                           'th' : ['tr'],
+                           'thead' : ['table'],
+                           'tbody' : ['table'],
+                           'tfoot' : ['table'],
+                           }
+
+    NON_NESTABLE_BLOCK_TAGS = ('address', 'form', 'p', 'pre')
+
+    #If one of these tags is encountered, all tags up to the next tag of
+    #this type are popped.
+    RESET_NESTING_TAGS = buildTagMap(None, NESTABLE_BLOCK_TAGS, 'noscript',
+                                     NON_NESTABLE_BLOCK_TAGS,
+                                     NESTABLE_LIST_TAGS,
+                                     NESTABLE_TABLE_TAGS)
+
+    NESTABLE_TAGS = buildTagMap([], NESTABLE_INLINE_TAGS, NESTABLE_BLOCK_TAGS,
+                                NESTABLE_LIST_TAGS, NESTABLE_TABLE_TAGS)
+
+    # Used to detect the charset in a META tag; see start_meta
+    CHARSET_RE = re.compile("((^|;)\s*charset=)([^;]*)", re.M)
+
+    def start_meta(self, attrs):
+        """Beautiful Soup can detect a charset included in a META tag,
+        try to convert the document to that charset, and re-parse the
+        document from the beginning."""
+        httpEquiv = None
+        contentType = None
+        contentTypeIndex = None
+        tagNeedsEncodingSubstitution = False
+
+        for i in range(0, len(attrs)):
+            key, value = attrs[i]
+            key = key.lower()
+            if key == 'http-equiv':
+                httpEquiv = value
+            elif key == 'content':
+                contentType = value
+                contentTypeIndex = i
+
+        if httpEquiv and contentType: # It's an interesting meta tag.
+            match = self.CHARSET_RE.search(contentType)
+            if match:
+                if (self.declaredHTMLEncoding is not None or
+                    self.originalEncoding == self.fromEncoding):
+                    # An HTML encoding was sniffed while converting
+                    # the document to Unicode, or an HTML encoding was
+                    # sniffed during a previous pass through the
+                    # document, or an encoding was specified
+                    # explicitly and it worked. Rewrite the meta tag.
+                    def rewrite(match):
+                        return match.group(1) + "%SOUP-ENCODING%"
+                    newAttr = self.CHARSET_RE.sub(rewrite, contentType)
+                    attrs[contentTypeIndex] = (attrs[contentTypeIndex][0],
+                                               newAttr)
+                    tagNeedsEncodingSubstitution = True
+                else:
+                    # This is our first pass through the document.
+                    # Go through it again with the encoding information.
+                    newCharset = match.group(3)
+                    if newCharset and newCharset != self.originalEncoding:
+                        self.declaredHTMLEncoding = newCharset
+                        self._feed(self.declaredHTMLEncoding)
+                        raise StopParsing
+                    pass
+        tag = self.unknown_starttag("meta", attrs)
+        if tag and tagNeedsEncodingSubstitution:
+            tag.containsSubstitutions = True
+
+class StopParsing(Exception):
+    pass
+
+class ICantBelieveItsBeautifulSoup(BeautifulSoup):
+
+    """The BeautifulSoup class is oriented towards skipping over
+    common HTML errors like unclosed tags. However, sometimes it makes
+    errors of its own. For instance, consider this fragment:
+
+     <b>Foo<b>Bar</b></b>
+
+    This is perfectly valid (if bizarre) HTML. However, the
+    BeautifulSoup class will implicitly close the first b tag when it
+    encounters the second 'b'. It will think the author wrote
+    "<b>Foo<b>Bar", and didn't close the first 'b' tag, because
+    there's no real-world reason to bold something that's already
+    bold. When it encounters '</b></b>' it will close two more 'b'
+    tags, for a grand total of three tags closed instead of two. This
+    can throw off the rest of your document structure. The same is
+    true of a number of other tags, listed below.
+
+    It's much more common for someone to forget to close a 'b' tag
+    than to actually use nested 'b' tags, and the BeautifulSoup class
+    handles the common case. This class handles the not-co-common
+    case: where you can't believe someone wrote what they did, but
+    it's valid HTML and BeautifulSoup screwed up by assuming it
+    wouldn't be."""
+
+    I_CANT_BELIEVE_THEYRE_NESTABLE_INLINE_TAGS = \
+     ('em', 'big', 'i', 'small', 'tt', 'abbr', 'acronym', 'strong',
+      'cite', 'code', 'dfn', 'kbd', 'samp', 'strong', 'var', 'b',
+      'big')
+
+    I_CANT_BELIEVE_THEYRE_NESTABLE_BLOCK_TAGS = ('noscript',)
+
+    NESTABLE_TAGS = buildTagMap([], BeautifulSoup.NESTABLE_TAGS,
+                                I_CANT_BELIEVE_THEYRE_NESTABLE_BLOCK_TAGS,
+                                I_CANT_BELIEVE_THEYRE_NESTABLE_INLINE_TAGS)
+
+class MinimalSoup(BeautifulSoup):
+    """The MinimalSoup class is for parsing HTML that contains
+    pathologically bad markup. It makes no assumptions about tag
+    nesting, but it does know which tags are self-closing, that
+    <script> tags contain Javascript and should not be parsed, that
+    META tags may contain encoding information, and so on.
+
+    This also makes it better for subclassing than BeautifulStoneSoup
+    or BeautifulSoup."""
+
+    RESET_NESTING_TAGS = buildTagMap('noscript')
+    NESTABLE_TAGS = {}
+
+class BeautifulSOAP(BeautifulStoneSoup):
+    """This class will push a tag with only a single string child into
+    the tag's parent as an attribute. The attribute's name is the tag
+    name, and the value is the string child. An example should give
+    the flavor of the change:
+
+    <foo><bar>baz</bar></foo>
+     =>
+    <foo bar="baz"><bar>baz</bar></foo>
+
+    You can then access fooTag['bar'] instead of fooTag.barTag.string.
+
+    This is, of course, useful for scraping structures that tend to
+    use subelements instead of attributes, such as SOAP messages. Note
+    that it modifies its input, so don't print the modified version
+    out.
+
+    I'm not sure how many people really want to use this class; let me
+    know if you do. Mainly I like the name."""
+
+    def popTag(self):
+        if len(self.tagStack) > 1:
+            tag = self.tagStack[-1]
+            parent = self.tagStack[-2]
+            parent._getAttrMap()
+            if (isinstance(tag, Tag) and len(tag.contents) == 1 and
+                isinstance(tag.contents[0], NavigableString) and
+                not parent.attrMap.has_key(tag.name)):
+                parent[tag.name] = tag.contents[0]
+        BeautifulStoneSoup.popTag(self)
+
+#Enterprise class names! It has come to our attention that some people
+#think the names of the Beautiful Soup parser classes are too silly
+#and "unprofessional" for use in enterprise screen-scraping. We feel
+#your pain! For such-minded folk, the Beautiful Soup Consortium And
+#All-Night Kosher Bakery recommends renaming this file to
+#"RobustParser.py" (or, in cases of extreme enterprisiness,
+#"RobustParserBeanInterface.class") and using the following
+#enterprise-friendly class aliases:
+class RobustXMLParser(BeautifulStoneSoup):
+    pass
+class RobustHTMLParser(BeautifulSoup):
+    pass
+class RobustWackAssHTMLParser(ICantBelieveItsBeautifulSoup):
+    pass
+class RobustInsanelyWackAssHTMLParser(MinimalSoup):
+    pass
+class SimplifyingSOAPParser(BeautifulSOAP):
+    pass
+
+######################################################
+#
+# Bonus library: Unicode, Dammit
+#
+# This class forces XML data into a standard format (usually to UTF-8
+# or Unicode).  It is heavily based on code from Mark Pilgrim's
+# Universal Feed Parser. It does not rewrite the XML or HTML to
+# reflect a new encoding: that happens in BeautifulStoneSoup.handle_pi
+# (XML) and BeautifulSoup.start_meta (HTML).
+
+# Autodetects character encodings.
+# Download from http://chardet.feedparser.org/
+try:
+    import chardet
+#    import chardet.constants
+#    chardet.constants._debug = 1
+except ImportError:
+    chardet = None
+
+# cjkcodecs and iconv_codec make Python know about more character encodings.
+# Both are available from http://cjkpython.i18n.org/
+# They're built in if you use Python 2.4.
+try:
+    import cjkcodecs.aliases
+except ImportError:
+    pass
+try:
+    import iconv_codec
+except ImportError:
+    pass
+
+class UnicodeDammit:
+    """A class for detecting the encoding of a *ML document and
+    converting it to a Unicode string. If the source encoding is
+    windows-1252, can replace MS smart quotes with their HTML or XML
+    equivalents."""
+
+    # This dictionary maps commonly seen values for "charset" in HTML
+    # meta tags to the corresponding Python codec names. It only covers
+    # values that aren't in Python's aliases and can't be determined
+    # by the heuristics in find_codec.
+    CHARSET_ALIASES = { "macintosh" : "mac-roman",
+                        "x-sjis" : "shift-jis" }
+
+    def __init__(self, markup, overrideEncodings=[],
+                 smartQuotesTo='xml', isHTML=False):
+        self.declaredHTMLEncoding = None
+        self.markup, documentEncoding, sniffedEncoding = \
+                     self._detectEncoding(markup, isHTML)
+        self.smartQuotesTo = smartQuotesTo
+        self.triedEncodings = []
+        if markup == '' or isinstance(markup, unicode):
+            self.originalEncoding = None
+            self.unicode = unicode(markup)
+            return
+
+        u = None
+        for proposedEncoding in overrideEncodings:
+            u = self._convertFrom(proposedEncoding)
+            if u: break
+        if not u:
+            for proposedEncoding in (documentEncoding, sniffedEncoding):
+                u = self._convertFrom(proposedEncoding)
+                if u: break
+
+        # If no luck and we have auto-detection library, try that:
+        if not u and chardet and not isinstance(self.markup, unicode):
+            u = self._convertFrom(chardet.detect(self.markup)['encoding'])
+
+        # As a last resort, try utf-8 and windows-1252:
+        if not u:
+            for proposed_encoding in ("utf-8", "windows-1252"):
+                u = self._convertFrom(proposed_encoding)
+                if u: break
+
+        self.unicode = u
+        if not u: self.originalEncoding = None
+
+    def _subMSChar(self, orig):
+        """Changes a MS smart quote character to an XML or HTML
+        entity."""
+        sub = self.MS_CHARS.get(orig)
+        if isinstance(sub, tuple):
+            if self.smartQuotesTo == 'xml':
+                sub = '&#x%s;' % sub[1]
+            else:
+                sub = '&%s;' % sub[0]
+        return sub
+
+    def _convertFrom(self, proposed):
+        proposed = self.find_codec(proposed)
+        if not proposed or proposed in self.triedEncodings:
+            return None
+        self.triedEncodings.append(proposed)
+        markup = self.markup
+
+        # Convert smart quotes to HTML if coming from an encoding
+        # that might have them.
+        if self.smartQuotesTo and proposed.lower() in("windows-1252",
+                                                      "iso-8859-1",
+                                                      "iso-8859-2"):
+            markup = re.compile("([\x80-\x9f])").sub \
+                     (lambda(x): self._subMSChar(x.group(1)),
+                      markup)
+
+        try:
+            # print "Trying to convert document to %s" % proposed
+            u = self._toUnicode(markup, proposed)
+            self.markup = u
+            self.originalEncoding = proposed
+        except Exception, e:
+            # print "That didn't work!"
+            # print e
+            return None
+        #print "Correct encoding: %s" % proposed
+        return self.markup
+
+    def _toUnicode(self, data, encoding):
+        '''Given a string and its encoding, decodes the string into Unicode.
+        %encoding is a string recognized by encodings.aliases'''
+
+        # strip Byte Order Mark (if present)
+        if (len(data) >= 4) and (data[:2] == '\xfe\xff') \
+               and (data[2:4] != '\x00\x00'):
+            encoding = 'utf-16be'
+            data = data[2:]
+        elif (len(data) >= 4) and (data[:2] == '\xff\xfe') \
+                 and (data[2:4] != '\x00\x00'):
+            encoding = 'utf-16le'
+            data = data[2:]
+        elif data[:3] == '\xef\xbb\xbf':
+            encoding = 'utf-8'
+            data = data[3:]
+        elif data[:4] == '\x00\x00\xfe\xff':
+            encoding = 'utf-32be'
+            data = data[4:]
+        elif data[:4] == '\xff\xfe\x00\x00':
+            encoding = 'utf-32le'
+            data = data[4:]
+        newdata = unicode(data, encoding)
+        return newdata
+
+    def _detectEncoding(self, xml_data, isHTML=False):
+        """Given a document, tries to detect its XML encoding."""
+        xml_encoding = sniffed_xml_encoding = None
+        try:
+            if xml_data[:4] == '\x4c\x6f\xa7\x94':
+                # EBCDIC
+                xml_data = self._ebcdic_to_ascii(xml_data)
+            elif xml_data[:4] == '\x00\x3c\x00\x3f':
+                # UTF-16BE
+                sniffed_xml_encoding = 'utf-16be'
+                xml_data = unicode(xml_data, 'utf-16be').encode('utf-8')
+            elif (len(xml_data) >= 4) and (xml_data[:2] == '\xfe\xff') \
+                     and (xml_data[2:4] != '\x00\x00'):
+                # UTF-16BE with BOM
+                sniffed_xml_encoding = 'utf-16be'
+                xml_data = unicode(xml_data[2:], 'utf-16be').encode('utf-8')
+            elif xml_data[:4] == '\x3c\x00\x3f\x00':
+                # UTF-16LE
+                sniffed_xml_encoding = 'utf-16le'
+                xml_data = unicode(xml_data, 'utf-16le').encode('utf-8')
+            elif (len(xml_data) >= 4) and (xml_data[:2] == '\xff\xfe') and \
+                     (xml_data[2:4] != '\x00\x00'):
+                # UTF-16LE with BOM
+                sniffed_xml_encoding = 'utf-16le'
+                xml_data = unicode(xml_data[2:], 'utf-16le').encode('utf-8')
+            elif xml_data[:4] == '\x00\x00\x00\x3c':
+                # UTF-32BE
+                sniffed_xml_encoding = 'utf-32be'
+                xml_data = unicode(xml_data, 'utf-32be').encode('utf-8')
+            elif xml_data[:4] == '\x3c\x00\x00\x00':
+                # UTF-32LE
+                sniffed_xml_encoding = 'utf-32le'
+                xml_data = unicode(xml_data, 'utf-32le').encode('utf-8')
+            elif xml_data[:4] == '\x00\x00\xfe\xff':
+                # UTF-32BE with BOM
+                sniffed_xml_encoding = 'utf-32be'
+                xml_data = unicode(xml_data[4:], 'utf-32be').encode('utf-8')
+            elif xml_data[:4] == '\xff\xfe\x00\x00':
+                # UTF-32LE with BOM
+                sniffed_xml_encoding = 'utf-32le'
+                xml_data = unicode(xml_data[4:], 'utf-32le').encode('utf-8')
+            elif xml_data[:3] == '\xef\xbb\xbf':
+                # UTF-8 with BOM
+                sniffed_xml_encoding = 'utf-8'
+                xml_data = unicode(xml_data[3:], 'utf-8').encode('utf-8')
+            else:
+                sniffed_xml_encoding = 'ascii'
+                pass
+        except:
+            xml_encoding_match = None
+        xml_encoding_match = re.compile(
+            '^<\?.*encoding=[\'"](.*?)[\'"].*\?>').match(xml_data)
+        if not xml_encoding_match and isHTML:
+            regexp = re.compile('<\s*meta[^>]+charset=([^>]*?)[;\'">]', re.I)
+            xml_encoding_match = regexp.search(xml_data)
+        if xml_encoding_match is not None:
+            xml_encoding = xml_encoding_match.groups()[0].lower()
+            if isHTML:
+                self.declaredHTMLEncoding = xml_encoding
+            if sniffed_xml_encoding and \
+               (xml_encoding in ('iso-10646-ucs-2', 'ucs-2', 'csunicode',
+                                 'iso-10646-ucs-4', 'ucs-4', 'csucs4',
+                                 'utf-16', 'utf-32', 'utf_16', 'utf_32',
+                                 'utf16', 'u16')):
+                xml_encoding = sniffed_xml_encoding
+        return xml_data, xml_encoding, sniffed_xml_encoding
+
+
+    def find_codec(self, charset):
+        return self._codec(self.CHARSET_ALIASES.get(charset, charset)) \
+               or (charset and self._codec(charset.replace("-", ""))) \
+               or (charset and self._codec(charset.replace("-", "_"))) \
+               or charset
+
+    def _codec(self, charset):
+        if not charset: return charset
+        codec = None
+        try:
+            codecs.lookup(charset)
+            codec = charset
+        except (LookupError, ValueError):
+            pass
+        return codec
+
+    EBCDIC_TO_ASCII_MAP = None
+    def _ebcdic_to_ascii(self, s):
+        c = self.__class__
+        if not c.EBCDIC_TO_ASCII_MAP:
+            emap = (0,1,2,3,156,9,134,127,151,141,142,11,12,13,14,15,
+                    16,17,18,19,157,133,8,135,24,25,146,143,28,29,30,31,
+                    128,129,130,131,132,10,23,27,136,137,138,139,140,5,6,7,
+                    144,145,22,147,148,149,150,4,152,153,154,155,20,21,158,26,
+                    32,160,161,162,163,164,165,166,167,168,91,46,60,40,43,33,
+                    38,169,170,171,172,173,174,175,176,177,93,36,42,41,59,94,
+                    45,47,178,179,180,181,182,183,184,185,124,44,37,95,62,63,
+                    186,187,188,189,190,191,192,193,194,96,58,35,64,39,61,34,
+                    195,97,98,99,100,101,102,103,104,105,196,197,198,199,200,
+                    201,202,106,107,108,109,110,111,112,113,114,203,204,205,
+                    206,207,208,209,126,115,116,117,118,119,120,121,122,210,
+                    211,212,213,214,215,216,217,218,219,220,221,222,223,224,
+                    225,226,227,228,229,230,231,123,65,66,67,68,69,70,71,72,
+                    73,232,233,234,235,236,237,125,74,75,76,77,78,79,80,81,
+                    82,238,239,240,241,242,243,92,159,83,84,85,86,87,88,89,
+                    90,244,245,246,247,248,249,48,49,50,51,52,53,54,55,56,57,
+                    250,251,252,253,254,255)
+            import string
+            c.EBCDIC_TO_ASCII_MAP = string.maketrans( \
+            ''.join(map(chr, range(256))), ''.join(map(chr, emap)))
+        return s.translate(c.EBCDIC_TO_ASCII_MAP)
+
+    MS_CHARS = { '\x80' : ('euro', '20AC'),
+                 '\x81' : ' ',
+                 '\x82' : ('sbquo', '201A'),
+                 '\x83' : ('fnof', '192'),
+                 '\x84' : ('bdquo', '201E'),
+                 '\x85' : ('hellip', '2026'),
+                 '\x86' : ('dagger', '2020'),
+                 '\x87' : ('Dagger', '2021'),
+                 '\x88' : ('circ', '2C6'),
+                 '\x89' : ('permil', '2030'),
+                 '\x8A' : ('Scaron', '160'),
+                 '\x8B' : ('lsaquo', '2039'),
+                 '\x8C' : ('OElig', '152'),
+                 '\x8D' : '?',
+                 '\x8E' : ('#x17D', '17D'),
+                 '\x8F' : '?',
+                 '\x90' : '?',
+                 '\x91' : ('lsquo', '2018'),
+                 '\x92' : ('rsquo', '2019'),
+                 '\x93' : ('ldquo', '201C'),
+                 '\x94' : ('rdquo', '201D'),
+                 '\x95' : ('bull', '2022'),
+                 '\x96' : ('ndash', '2013'),
+                 '\x97' : ('mdash', '2014'),
+                 '\x98' : ('tilde', '2DC'),
+                 '\x99' : ('trade', '2122'),
+                 '\x9a' : ('scaron', '161'),
+                 '\x9b' : ('rsaquo', '203A'),
+                 '\x9c' : ('oelig', '153'),
+                 '\x9d' : '?',
+                 '\x9e' : ('#x17E', '17E'),
+                 '\x9f' : ('Yuml', ''),}
+
+#######################################################################
+
+
+#By default, act as an HTML pretty-printer.
+if __name__ == '__main__':
+    import sys
+    soup = BeautifulSoup(sys.stdin)
+    print soup.prettify()
diff --git a/Tools/Scripts/webkitpy/thirdparty/__init__.py b/Tools/Scripts/webkitpy/thirdparty/__init__.py
index b26e9c0..44f0f8d 100644
--- a/Tools/Scripts/webkitpy/thirdparty/__init__.py
+++ b/Tools/Scripts/webkitpy/thirdparty/__init__.py
@@ -42,6 +42,7 @@
 from distutils import spawn
 from webkitpy.common.system.autoinstall import AutoInstaller
 from webkitpy.common.system.filesystem import FileSystem
+from webkitpy.common.system.executive import Executive
 
 _THIRDPARTY_DIR = os.path.dirname(__file__)
 _AUTOINSTALLED_DIR = os.path.join(_THIRDPARTY_DIR, "autoinstalled")
@@ -77,8 +78,9 @@
 
 
 class AutoinstallImportHook(object):
-    def __init__(self, filesystem=None):
+    def __init__(self, filesystem=None, executive=None):
         self._fs = filesystem or FileSystem()
+        self._executive = executive or Executive()
 
     def _ensure_autoinstalled_dir_is_in_sys_path(self):
         # Some packages require that the are being put somewhere under a directory in sys.path.
@@ -124,6 +126,8 @@
             self._install_pytest()
         elif '.requests' in fullname:
             self._install_requests()
+        elif '.bs4' in fullname:
+            self._install_beautifulsoup()
 
     def _install_six(self):
         self._install("https://files.pythonhosted.org/packages/16/d8/bc6316cf98419719bd59c91742194c111b6f2e85abac88e496adefaf7afe/six-1.11.0.tar.gz",
@@ -196,6 +200,20 @@
         self._install("https://files.pythonhosted.org/packages/01/62/ddcf76d1d19885e8579acb1b1df26a852b03472c0e46d2b959a714c90608/requests-2.22.0.tar.gz",
                       "requests-2.22.0/requests")
 
+    def _install_beautifulsoup(self):
+        if sys.version_info < (3, 0):
+            return
+
+        self._install_requests()
+        self._ensure_autoinstalled_dir_is_in_sys_path()
+        self._install("https://files.pythonhosted.org/packages/7f/4e/95a13527e18b6f1a15c93f1c634b86d5fa634c5619dce695f4e0cd68182f/soupsieve-1.9.4.tar.gz",
+                      "soupsieve-1.9.4/soupsieve")
+        did_download_bs4 = self._install("https://files.pythonhosted.org/packages/86/cd/495c68f0536dcd25f016e006731ba7be72e072280305ec52590012c1e6f2/beautifulsoup4-4.8.1.tar.gz",
+                                         "beautifulsoup4-4.8.1/bs4")
+        if did_download_bs4:
+            self._executive.run_command(['2to3', '-w', self._fs.join(_AUTOINSTALLED_DIR, 'bs4')])
+
+
     def _install_pylint(self):
         self._ensure_autoinstalled_dir_is_in_sys_path()
         if (not self._fs.exists(self._fs.join(_AUTOINSTALLED_DIR, "pylint")) or
@@ -291,7 +309,7 @@
 
     def _install(self, url, url_subpath=None, target_name=None):
         installer = AutoInstaller(target_dir=_AUTOINSTALLED_DIR)
-        installer.install(url=url, url_subpath=url_subpath, target_name=target_name)
+        return installer.install(url=url, url_subpath=url_subpath, target_name=target_name)
 
     def get_latest_pypi_url(self, package_name, url_subpath_format='{name}-{version}/{lname}'):
         json_url = "https://pypi.org/pypi/%s/json" % package_name
diff --git a/Tools/Scripts/webkitpy/thirdparty/mock.py b/Tools/Scripts/webkitpy/thirdparty/mock.py
index 015c19e..d578574 100644
--- a/Tools/Scripts/webkitpy/thirdparty/mock.py
+++ b/Tools/Scripts/webkitpy/thirdparty/mock.py
@@ -118,7 +118,7 @@
         self.call_count = 0
         self.call_args_list = []
         self.method_calls = []
-        for child in self._children.itervalues():
+        for child in self._children.values():
             child.reset_mock()
         if isinstance(self._return_value, Mock):
             self._return_value.reset_mock()