/usr/lib/python3/dist-packages/pyVmomi/Iso8601.py is in python3-pyvmomi 6.5.0.2017.5-0ubuntu1.
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# Copyright (c) 2008-2015 VMware, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
# TODO (hartsocks): Introduce logging to remove the need for print function.
"""
This module is for ISO 8601 parsing
"""
__author__ = 'VMware, Inc.'
from six import iteritems
import time
from datetime import datetime, timedelta, tzinfo
import re
""" Regular expression to parse a subset of ISO 8601 format """
_dtExpr = re.compile(
# XMLSchema datetime. Mandatory to have - and :
# See: http://www.w3.org/TR/xmlschema-2/#isoformats
# Note: python datetime cannot handle the following:
# - leap second, ie. 0-60 seconds (not 0-59)
# - BC (negative years)
# year [-]0000..9999
r'(?P<year>-?\d{4})' \
# month 01..12
r'(-(?P<month>(0[1-9]|1[0-2]))' \
# day 01..31
r'(-(?P<day>(0[1-9]|[1-2]\d|3[01])))?)?' \
# time separator 'T'
r'(T' \
# hour 00..24
r'(?P<hour>([01]\d|2[0-4]))' \
# minute 00..59
r'((:(?P<minute>[0-5]\d))' \
# seconds 00..60 (leap second ok)
r'(:(?P<second>([0-5]\d|60))' \
# microsecond. max 16 digits
# - Should not allows trailing zeros. But python isoformat() put zeros
# after microseconds. Oh well, allows trailing zeros, quite harmless
r'(\.(?P<microsecond>\d{1,16}))?)?)?' \
# UTC 'Z', or...
r'((?P<tzutc>Z)' \
# tz [+-]00..13:0..59|14:00
r'|((?P<tzhr>[+-](([0]\d)|(1[0-3])|(?P<tzlimit>)14))' \
r'(:(?P<tzmin>(?(tzlimit)00|([0-5]\d))))?))?' \
r')?$')
""" Default date time val. Key should match the tags in _dtExpr """
_dtExprKeyDefValMap = {'year' : None, 'month' : 1, 'day' : 1,
'hour' : 0, 'minute' : 0, 'second' : 0,
'microsecond' : 0}
class TZInfo(tzinfo):
""" Timezone info class """
timedelta0 = timedelta(hours=0)
timedelta1 = timedelta(hours=1)
def __init__(self, tzname='UTC', utcOffset=None, dst=None):
self._tzname = tzname
if not utcOffset:
utcOffset = self.timedelta0
self._utcOffset = utcOffset
if not dst:
dst = None
self._dst = dst
def utcoffset(self, dt):
return self._utcOffset + self.dst(dt)
def tzname(self, dt):
return self._tzname
def dst(self, dt):
ret = self.timedelta0
if self._dst:
if self._dst[0] <= dt.replace(tzinfo=None) < self._dst[1]:
ret = self.timedelta1
return ret
class TZManager:
""" Time zone manager """
_tzInfos = {}
@staticmethod
def GetTZInfo(tzname='UTC', utcOffset=None, dst=None):
""" Get / Add timezone info """
key = (tzname, utcOffset, dst)
tzInfo = TZManager._tzInfos.get(key)
if not tzInfo:
tzInfo = TZInfo(tzname, utcOffset, dst)
TZManager._tzInfos[key] = tzInfo
return tzInfo
def ParseISO8601(datetimeStr):
"""
Parse ISO 8601 date time from string.
Returns datetime if ok, None otherwise
Note: Allows YYYY / YYYY-MM, but truncate YYYY -> YYYY-01-01,
YYYY-MM -> YYYY-MM-01
Truncate microsecond to most significant 6 digits
"""
datetimeVal = None
match = _dtExpr.match(datetimeStr)
if match:
try:
dt = {}
for key, defaultVal in iteritems(_dtExprKeyDefValMap):
val = match.group(key)
if val:
if key == 'microsecond':
val = val[:6] + '0' * (6 - len(val))
dt[key] = int(val)
elif defaultVal:
dt[key] = defaultVal
# Orig. XMLSchema don't allow all zeros year. But newer draft is ok
#if dt['year'] == 0:
# # Year cannot be all zeros
# raise Exception('Year cannot be all zeros')
# 24 is a special case. It is actually represented as next day 00:00
delta = None
if dt.get('hour', 0) == 24:
# Must be 24:00:00.0
if dt.get('minute', 0) == 0 and dt.get('second', 0) == 0 and \
dt.get('microsecond', 0) == 0:
dt['hour'] = 23
delta = timedelta(hours=1)
else:
return None
# Set tzinfo
# TODO: dst
tzInfo = None
val = match.group('tzutc')
if val:
tzInfo = TZManager.GetTZInfo()
else:
val = match.group('tzhr')
if val:
# tz hours offset
tzhr = int(val)
utcsign = val[0]
# tz minutes offset
tzmin = 0
val = match.group('tzmin')
if val:
tzmin = tzhr >= 0 and int(val) or -int(val)
# Better tzname (map UTC +-00:00 to UTC)
tzname = 'UTC'
if tzhr != 0 or tzmin != 0:
tzname += ' %s%02d:%02d' % (utcsign, abs(tzhr), abs(tzmin))
tzInfo = TZManager.GetTZInfo(tzname=tzname,
utcOffset=timedelta(hours=tzhr,
minutes=tzmin))
if tzInfo:
dt['tzinfo'] = tzInfo
datetimeVal = datetime(**dt)
if delta:
datetimeVal += delta
except Exception as e:
pass
return datetimeVal
def ISO8601Format(dt):
"""
Python datetime isoformat() has the following problems:
- leave trailing 0 at the end of microseconds (violates XMLSchema rule)
- tz print +00:00 instead of Z
- Missing timezone offset for datetime without tzinfo
"""
isoStr = dt.strftime('%Y-%m-%dT%H:%M:%S')
if dt.microsecond:
isoStr += ('.%06d' % dt.microsecond).rstrip('0')
if dt.tzinfo:
tz = dt.strftime('%z')
else:
if time.daylight and time.localtime().tm_isdst:
utcOffset_minutes = -time.altzone / 60
else:
utcOffset_minutes = -time.timezone / 60
tz = "%+.2d%.2d" % (utcOffset_minutes / 60, (abs(utcOffset_minutes) % 60))
if tz == '+0000':
return isoStr + 'Z'
elif tz:
return isoStr + tz[:3] + ':' + tz[3:]
else:
# Local offset is unknown
return isoStr + '-00:00'
# Testing
if __name__ == '__main__':
# Valid entries
for testStr in [
'1971', # 1971-01-01
'1971-11', # 1971-11-01
'1971-11-02',
'1971-11-02T23',
'1971-11-02T23Z',
'1971-11-02T23:04',
'1971-11-02T23:04Z',
'1971-11-02T23:04:15',
'1971-11-02T23:04:15Z',
'1971-11-02T23:04:15.1',
'1971-11-02T23:04:15.01',
'1971-11-02T23:04:15.023456',
'1971-11-02T23:04:15.103456Z',
'1971-11-02T23:04:15.123456+11',
'1971-11-02T23:04:15.123456-11',
'1971-11-02T23:04:15.123456+11:30',
'1971-11-02T23:04:15.123456-11:30',
'1971-11-02T23:04:15.123456+00:00', # Same as Z
'1971-11-02T23:04:15.123456-00:00', # Same as Z
'1971-01-02T23:04:15+14',
'1971-01-02T23:04:15+14:00',
'1971-01-02T23:04:15-14',
'1971-01-02T23:04:15-14:00',
# Valid: Truncate microsec to 6 digits
'1971-01-02T23:04:15.123456891+11',
'1971-01-02T24', # 24 is valid. It should represent the 00:00 the
# next day
'1971-01-02T24:00',
'1971-01-02T24:00:00',
'1971-01-02T24:00:00.0',
# Should NOT be valid but python isoformat adding trailing zeros
'1971-01-02T23:04:15.123430', # Microseconds ends in zero
'1971-01-02T23:04:15.0', # Microseconds ends in zero
# Should be valid but python datetime don't support it
#'2005-12-31T23:59:60Z', # Leap second
#'-0001', # BC 1
]:
dt = ParseISO8601(testStr)
if dt == None:
print('Failed to parse ({0})'.format(testStr))
assert(False)
# Make sure we can translate back
isoformat = ISO8601Format(dt)
dt1 = ParseISO8601(isoformat)
if dt.tzinfo is None:
dt = dt.replace(tzinfo=dt1.tzinfo)
if dt1 != dt:
print('ParseISO8601 -> ISO8601Format -> ParseISO8601 failed ({0})'.format(testStr))
assert(False)
# Make sure we can parse python isoformat()
dt2 = ParseISO8601(dt.isoformat())
if dt2 == None:
print('ParseISO8601("{0}".isoformat()) failed'.format(testStr))
assert(False)
print(testStr, '->', dt, isoformat)
# Basic form
for testStr in [
'197111', # 1971-11-01
'19711102',
'19711102T23',
'19711102T23Z',
'19711102T2304',
'19711102T2304Z',
'19711102T230415',
'19711102T230415Z',
'19711102T230415.123456',
'19711102T230415.123456Z',
'19711102T230415.123456+11',
'19711102T230415.123456-11',
'19711102T230415.123456+1130',
'19711102T230415.123456-1130',
]:
# Reject for now
dt = ParseISO8601(testStr)
if dt != None:
print('ParseISO8601 ({0}) should fail, but it did not'.format(testStr))
assert(False)
#print testStr, '->', dt
#assert(dt != None)
# Invalid entries
for testStr in [
# Xml schema reject year 0
'0000', # 0 years are not allowed
'+0001', # Leading + is not allowed
'', # Empty datetime str
'09', # Years must be at least 4 digits
'1971-01-02T', # T not follow by time
'1971-01-02TZ', # T not follow by time
'1971-01-02T+10', # T not follow by time
'1971-01-02T-10', # T not follow by time
'1971-01-02T23:', # extra :
'1971-01-02T23:04:', # extra :
'1971-01-02T23:0d', # 0d
'1971-01-02T23:04:15.', # Dot not follows by microsec
'1971-01-02+12', # time without T
'1971Z', # Z without T
'1971-01-02T23:04:15.123456Z+11', # Z follows by +
'1971-01-02T23:04:15.123456Z-11', # Z follows by -
'1971-01-02T23:04:15.123456+:30', # extra :
'1971-01-02T23:04:15.123456+30:', # extra :
'1971-01-02T23:04:15.01234567890123456789', # Too many microseconds digits
# Python isoformat leave trailing zeros in microseconds
# Relax regular expression to accept it
#'1971-01-02T23:04:15.123430', # Microseconds ends in zero
#'1971-01-02T23:04:15.0', # Microseconds ends in zero
# Timezone must be between +14 / -14
'1971-01-02T23:04:15+15',
'1971-01-02T23:04:15-15',
'1971-01-02T23:04:15+14:01',
'1971-01-02T23:04:15-14:01',
# Mix basic form with extended format
'197101-02T23:04:15.123456',
'19710102T23:04:15.123456',
'19710102T230415.123456+11:30',
'1971-01-02T230415.123456',
'1971-01-02T23:04:15.123456+1130',
# Error captured by datetime class
'1971-00-02', # Less than 1 month
'1971-13-02', # Larger than 12 months
'1971-01-00', # Less than 1 day
'1971-11-32', # Larger than 30 days for Nov
'1971-12-32', # Larger than 31 days
'1971-01-02T24:01', # Larger than 23 hr
'1971-01-02T23:61', # Larger than 60 min
'1971-01-02T23:60:61', # Larger than 61 sec
]:
dt = ParseISO8601(testStr)
if dt != None:
print('ParseISO8601 ({0}) should fail, but it did not'.format(testStr))
assert(False)
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