Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/feedparser/datetimes/__init__.py

@@ -0,0 +1,70 @@
+# Copyright 2010-2021 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2002-2008 Mark Pilgrim
+# All rights reserved.
+#
+# This file is a part of feedparser.
+#
+# 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.
+#
+# 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.
+
+from .asctime import _parse_date_asctime
+from .greek import _parse_date_greek
+from .hungarian import _parse_date_hungarian
+from .iso8601 import _parse_date_iso8601
+from .korean import _parse_date_onblog, _parse_date_nate
+from .perforce import _parse_date_perforce
+from .rfc822 import _parse_date_rfc822
+from .w3dtf import _parse_date_w3dtf
+
+_date_handlers = []
+
+
+def registerDateHandler(func):
+    """Register a date handler function (takes string, returns 9-tuple date in GMT)"""
+    _date_handlers.insert(0, func)
+
+
+def _parse_date(date_string):
+    """Parses a variety of date formats into a 9-tuple in GMT"""
+    if not date_string:
+        return None
+    for handler in _date_handlers:
+        try:
+            date9tuple = handler(date_string)
+        except (KeyError, OverflowError, ValueError, AttributeError):
+            continue
+        if not date9tuple:
+            continue
+        if len(date9tuple) != 9:
+            continue
+        return date9tuple
+    return None
+
+
+registerDateHandler(_parse_date_onblog)
+registerDateHandler(_parse_date_nate)
+registerDateHandler(_parse_date_greek)
+registerDateHandler(_parse_date_hungarian)
+registerDateHandler(_parse_date_perforce)
+registerDateHandler(_parse_date_asctime)
+registerDateHandler(_parse_date_iso8601)
+registerDateHandler(_parse_date_rfc822)
+registerDateHandler(_parse_date_w3dtf)