Primer commit del proyecto RSS

venv/lib/python3.12/site-packages/feedparser/datetimes/rfc822.py

@@ -0,0 +1,150 @@
+# Copyright 2010-2023 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.
+
+import datetime
+
+timezone_names = {
+    'ut': 0, 'gmt': 0, 'z': 0,
+    'adt': -3, 'ast': -4, 'at': -4,
+    'edt': -4, 'est': -5, 'et': -5,
+    'cdt': -5, 'cst': -6, 'ct': -6,
+    'mdt': -6, 'mst': -7, 'mt': -7,
+    'pdt': -7, 'pst': -8, 'pt': -8,
+    'a': -1, 'n': 1,
+    'm': -12, 'y': 12,
+    'met': 1, 'mest': 2,
+}
+day_names = {'mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'}
+months = {
+    'jan': 1, 'feb': 2, 'mar': 3, 'apr': 4, 'may': 5, 'jun': 6,
+    'jul': 7, 'aug': 8, 'sep': 9, 'oct': 10, 'nov': 11, 'dec': 12,
+}
+
+
+def _parse_date_rfc822(date):
+    """Parse RFC 822 dates and times
+    http://tools.ietf.org/html/rfc822#section-5
+
+    There are some formatting differences that are accounted for:
+    1. Years may be two or four digits.
+    2. The month and day can be swapped.
+    3. Additional timezone names are supported.
+    4. A default time and timezone are assumed if only a date is present.
+
+    :param str date: a date/time string that will be converted to a time tuple
+    :returns: a UTC time tuple, or None
+    :rtype: time.struct_time | None
+    """
+
+    parts = date.lower().split()
+    if len(parts) < 5:
+        # Assume that the time and timezone are missing
+        parts.extend(('00:00:00', '0000'))
+    # Remove the day name
+    if parts[0][:3] in day_names:
+        parts = parts[1:]
+    if len(parts) < 5:
+        # If there are still fewer than five parts, there's not enough
+        # information to interpret this.
+        return None
+
+    # Handle the day and month name.
+    month = months.get(parts[1][:3])
+    try:
+        day = int(parts[0])
+    except ValueError:
+        # Check if the day and month are swapped.
+        if months.get(parts[0][:3]):
+            try:
+                day = int(parts[1])
+            except ValueError:
+                return None
+            month = months.get(parts[0][:3])
+        else:
+            return None
+    if not month:
+        return None
+
+    # Handle the year.
+    try:
+        year = int(parts[2])
+    except ValueError:
+        return None
+    # Normalize two-digit years:
+    # Anything in the 90's is interpreted as 1990 and on.
+    # Anything 89 or less is interpreted as 2089 or before.
+    if len(parts[2]) <= 2:
+        year += (1900, 2000)[year < 90]
+
+    # Handle the time (default to 00:00:00).
+    time_parts = parts[3].split(':')
+    time_parts.extend(('0',) * (3 - len(time_parts)))
+    try:
+        (hour, minute, second) = [int(i) for i in time_parts]
+    except ValueError:
+        return None
+
+    # Handle the timezone information, if any (default to +0000).
+    # Strip 'Etc/' from the timezone.
+    if parts[4].startswith('etc/'):
+        parts[4] = parts[4][4:]
+    # Normalize timezones that start with 'gmt':
+    # GMT-05:00 => -0500
+    # GMT => GMT
+    if parts[4].startswith('gmt'):
+        parts[4] = ''.join(parts[4][3:].split(':')) or 'gmt'
+    # Handle timezones like '-0500', '+0500', and 'EST'
+    if parts[4] and parts[4][0] in ('-', '+'):
+        try:
+            if ':' in parts[4]:
+                timezone_hours = int(parts[4][1:3])
+                timezone_minutes = int(parts[4][4:])
+            else:
+                timezone_hours = int(parts[4][1:3])
+                timezone_minutes = int(parts[4][3:])
+        except ValueError:
+            return None
+        if parts[4].startswith('-'):
+            timezone_hours *= -1
+            timezone_minutes *= -1
+    else:
+        timezone_hours = timezone_names.get(parts[4], 0)
+        timezone_minutes = 0
+
+    # Create the datetime object and timezone delta objects
+    try:
+        stamp = datetime.datetime(year, month, day, hour, minute, second)
+    except ValueError:
+        return None
+    delta = datetime.timedelta(0, 0, 0, 0, timezone_minutes, timezone_hours)
+
+    # Return the date and timestamp in a UTC 9-tuple
+    try:
+        return (stamp - delta).utctimetuple()
+    except (OverflowError, ValueError):
+        # IronPython throws ValueErrors instead of OverflowErrors
+        return None