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"""Copyright 2008 Orbitz WorldWide
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."""
import pytz
from datetime import datetime, timedelta, datetime as datetimetype
from django.conf import settings
months = ['jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec']
weekdays = ['sun','mon','tue','wed','thu','fri','sat']
SECONDS_STRING = 'seconds'
MINUTES_STRING = 'minutes'
HOURS_STRING = 'hours'
DAYS_STRING = 'days'
WEEKS_STRING = 'weeks'
MONTHS_STRING = 'months'
YEARS_STRING = 'years'
def parseATTime(s, tzinfo=None, now=None):
if tzinfo is None:
tzinfo = pytz.timezone(settings.TIME_ZONE)
if isinstance(s, datetimetype):
if s.tzinfo:
return s.astimezone(tzinfo)
return tzinfo.localize(s)
s = s.strip().lower().replace('_','').replace(',','').replace(' ','')
if s.isdigit():
if len(s) == 8 and int(s[:4]) > 1900 and int(s[4:6]) < 13 and int(s[6:]) < 32:
pass # Fall back because its not a timestamp, its YYYYMMDD form
else:
return datetime.fromtimestamp(int(s),tzinfo)
if '+' in s:
ref,offset = s.split('+',1)
offset = '+' + offset
elif '-' in s:
ref,offset = s.split('-',1)
offset = '-' + offset
else:
ref,offset = s,''
return tzinfo.normalize(parseTimeReference(ref, tzinfo, now) + parseTimeOffset(offset))
def parseTimeReference(ref, tzinfo=None, now=None):
if tzinfo is None:
tzinfo = pytz.timezone(settings.TIME_ZONE)
if isinstance(ref, datetimetype):
if ref.tzinfo:
return ref.astimezone(tzinfo)
return tzinfo.localize(ref)
if now is None:
now = datetime.now(tzinfo)
else:
now = parseATTime(now, tzinfo)
if not ref or ref == 'now':
return now
rawRef = ref
# Time-of-day reference
i = ref.find(':')
hour,minute = 0,0
if 0 < i < 3:
hour = int( ref[:i] )
minute = int( ref[i+1:i+3] )
ref = ref[i+3:]
if ref[:2] == 'am':
ref = ref[2:]
elif ref[:2] == 'pm':
hour = (hour + 12) % 24
ref = ref[2:]
# Xam or XXam
i = ref.find('am')
if 0 < i < 3:
hour = int( ref[:i] )
ref = ref[i+2:]
# Xpm or XXpm
i = ref.find('pm')
if 0 < i < 3:
hour = (int( ref[:i] ) + 12) % 24
ref = ref[i+2:]
if ref.startswith('noon'):
hour,minute = 12,0
ref = ref[4:]
elif ref.startswith('midnight'):
hour,minute = 0,0
ref = ref[8:]
elif ref.startswith('teatime'):
hour,minute = 16,0
ref = ref[7:]
refDate = now.replace(hour=hour,minute=minute,second=0,microsecond=0,tzinfo=None)
# Day reference
if ref in ('yesterday','today','tomorrow'): # yesterday, today, tomorrow
if ref == 'yesterday':
refDate -= timedelta(days=1)
elif ref == 'tomorrow':
refDate += timedelta(days=1)
elif ref.count('/') == 2: # MM/DD/YY[YY]
m,d,y = map(int,ref.split('/'))
if y < 1900:
y += 1900
if y < 1970:
y += 100
refDate = datetime(year=y,month=m,day=d,hour=hour,minute=minute)
elif len(ref) == 8 and ref.isdigit(): # YYYYMMDD
refDate = datetime(year=int(ref[:4]), month=int(ref[4:6]), day=int(ref[6:8]), hour=hour, minute=minute)
elif ref[:3] in months: # MonthName DayOfMonth
d = None
if ref[-2:].isdigit():
d = int(ref[-2:])
elif ref[-1:].isdigit():
d = int(ref[-1:])
else:
raise Exception("Day of month required after month name")
refDate = datetime(year=refDate.year, month=months.index(ref[:3]) + 1, day=d, hour=hour, minute=minute)
elif ref[:3] in weekdays: # DayOfWeek (Monday, etc)
todayDayName = refDate.strftime("%a").lower()[:3]
today = weekdays.index( todayDayName )
twoWeeks = weekdays * 2
dayOffset = today - twoWeeks.index(ref[:3])
if dayOffset < 0:
dayOffset += 7
refDate -= timedelta(days=dayOffset)
elif ref:
raise ValueError("Unknown day reference: %s" % rawRef)
return tzinfo.localize(refDate)
def parseTimeOffset(offset):
if not offset:
return timedelta()
t = timedelta()
if offset[0].isdigit():
sign = 1
else:
try:
sign = { '+' : 1, '-' : -1 }[offset[0]]
except KeyError:
raise KeyError('Invalid offset: %s' % offset)
offset = offset[1:]
while offset:
i = 1
while offset[:i].isdigit() and i <= len(offset):
i += 1
num = int(offset[:i-1])
offset = offset[i-1:]
i = 1
while offset[:i].isalpha() and i <= len(offset):
i += 1
unit = offset[:i-1]
offset = offset[i-1:]
unitString = getUnitString(unit)
if unitString == MONTHS_STRING:
unitString = DAYS_STRING
num = num * 30
if unitString == YEARS_STRING:
unitString = DAYS_STRING
num = num * 365
t += timedelta(**{ unitString : sign * num})
return t
def getUnitString(s):
if s.startswith('s'): return SECONDS_STRING
if s.startswith('min'): return MINUTES_STRING
if s.startswith('h'): return HOURS_STRING
if s.startswith('d'): return DAYS_STRING
if s.startswith('w'): return WEEKS_STRING
if s.startswith('mon'): return MONTHS_STRING
if s.startswith('y'): return YEARS_STRING
raise ValueError("Invalid offset unit '%s'" % s)
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