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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
from time import daylight
months = ['jan', 'feb', 'mar', 'apr', 'may', 'jun',
'jul', 'aug', 'sep', 'oct', 'nov', 'dec']
weekdays = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat']
def parseATTime(s, tzinfo=None):
if tzinfo is None:
from ..app import app
tzinfo = pytz.timezone(app.config['TIME_ZONE'])
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)
elif ':' in s and len(s) == 13:
return tzinfo.localize(datetime.strptime(s, '%H:%M%Y%m%d'), daylight)
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 (parseTimeReference(ref) +
parseTimeOffset(offset)).astimezone(tzinfo)
def parseTimeReference(ref):
if not ref or ref == 'now':
return datetime.utcnow().replace(tzinfo=pytz.utc)
# Time-of-day reference
i = ref.find(':')
hour, min = 0, 0
if i != -1:
hour = int(ref[:i])
min = 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:]
if ref.startswith('noon'):
hour, min = 12, 0
ref = ref[4:]
elif ref.startswith('midnight'):
hour, min = 0, 0
ref = ref[8:]
elif ref.startswith('teatime'):
hour, min = 16, 0
ref = ref[7:]
refDate = datetime.utcnow().replace(hour=hour, minute=min, second=0,
tzinfo=pytz.utc)
# Day reference
if ref in ('yesterday', 'today', 'tomorrow'): # yesterday, today, tomorrow
if ref == 'yesterday':
refDate = refDate - timedelta(days=1)
if ref == 'tomorrow':
refDate = 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 = replace_date(refDate, y, m, d)
elif len(ref) == 8 and ref.isdigit(): # YYYYMMDD
refDate = replace_date(refDate, int(ref[:4]), int(ref[4:6]),
int(ref[6:8]))
elif ref[:3] in months: # MonthName DayOfMonth
month = months.index(ref[:3]) + 1
if ref[-2:].isdigit():
day = int(ref[-2])
elif ref[-1:].isdigit():
day = int(ref[-1:])
else:
raise Exception("Day of month required after month name")
refDate = replace_date(refDate, None, month, day)
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 Exception("Unknown day reference")
return refDate
def replace_date(date, year, month, day):
if year is not None:
try:
date = date.replace(year=year)
except ValueError: # Feb 29.
date = date.replace(year=year, day=28)
try:
date = date.replace(month=month)
date = date.replace(day=day)
except ValueError: # day out of range for month, or vice versa
date = date.replace(day=day)
date = date.replace(month=month)
return date
def parseTimeOffset(offset):
if not offset:
return timedelta()
t = timedelta()
if offset[0].isdigit():
sign = 1
else:
sign = {'+': 1, '-': -1}[offset[0]]
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':
unitString = 'days'
num = num * 30
if unitString == 'years':
unitString = 'days'
num = num * 365
t += timedelta(**{unitString: sign * num})
return t
def getUnitString(s):
if s.startswith('s'):
return 'seconds'
if s.startswith('min'):
return 'minutes'
if s.startswith('h'):
return 'hours'
if s.startswith('d'):
return 'days'
if s.startswith('w'):
return 'weeks'
if s.startswith('mon'):
return 'months'
if s.startswith('y'):
return 'years'
raise Exception("Invalid offset unit '%s'" % s)
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