# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import calendar
from util import *
class LeapSeconds:
'''
Leap second announcement monitor
'''
PRIMARY = 0
'''
The leap occurs in a primarily preferred time slot
'''
SECONDARY = 1
'''
The leap occurs in a secondarily preferred time slot
'''
OUT_OF_BAND = 2
'''
The leap occurs out of band, not in any preferred time slot
'''
def __init__(self):
'''
Constructor
'''
url = 'http://maia.usno.navy.mil/ser7/leapsec.dat'
announcements = spawn_read('curl', url)
while ' ' in announcements:
announcements = announcements.replace(' ', ' ')
announcements = announcements.replace('= ', '=').replace('=JD ', '=JD')
announcements = [announcement.lstrip().split(' ') for announcement in announcements.split('\n')]
test = lambda announcement : announcement.startswith('TAI-UTC=') or announcement.startswith('UTC-TAI=')
announcements = [announcement[:3] + list(filter(test, announcement)) for announcement in announcements]
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
}
DAYS_OF_MONTHS = [-1, 31, 28, 31, 30, 31, 30, 30, 31, 30, 31, 30, 31]
def translate(announcement):
announcement[0] = int(announcement[0])
announcement[1] = MONTHS[announcement[1]]
announcement[2] = int(announcement[2]) - 1
if announcement[3].startswith('TAI-UTC='):
announcement[3] = int(announcement[3].split('=')[1].split('.')[0])
else:
announcement[3] = -(int(announcement[3].split('=')[1].split('.')[0]))
announcement.append(LeapSeconds.OUT_OF_BAND)
if announcement[2] == 0:
announcement[1] -= 1
if announcement[1] == 0:
announcement[1] = 12
announcement[0] -= 1
announcement[2] = DAYS_OF_MONTHS[announcement[1]]
if announcement[2] == 2:
year = announcement[0]
if ((year % 4 == 0) and not (year % 100 == 0)) or (year % 400 == 0):
announcement[2] += 1
if announcement[1] in (6, 12):
announcement[4] = LeapSeconds.PRIMARY
elif announcement[1] in (3, 9):
announcement[4] = LeapSeconds.SECONDARY
return announcement
announcements = [translate(announcement) for announcement in announcements]
for i in reversed(range(len(announcements) - 1)):
announcements[i + 1][3] -= announcements[i][3]
self.announcements = announcements[1:]
def __len__(self):
'''
Get the number of available leap second announcements
@return The number of available leap second announcements
'''
return len(self.announcements)
def __getitem__(self, index):
'''
Get a leap second announcement
@param index:int? The index of the announcement, negative for reversed chronological indexing
@return :(year:int, The year the leap second will occur or occurred (UTC)
month:int, The month [1, 12] the leap second will occur or occurred (UTC)
day:int, The day [1, 31] the leap second will occur or occurred (UTC)
posix:int, The POSIX timestamp the leap will occur or occurred.
Keep in mind that POSIX time does not have leap seconds;
if `amount == 1` then this time will represent 00:00:00 at
the day directly after the day described by (`year`, `month`, `day`)
amount:int, The number of leap seconds introduced, can be negative but not zero
annon:int) Annonouncement class, either of:
LeapSeconds.PRIMARY, LeapSeconds.SECONDARY, LeapSeconds.OUT_OF_BAND
'''
(y, m, d, a, t) = self.announcements[index]
s = 24 * 60 * 60 + a - 1
if a > 0:
s += 1
s = calendar.timegm((y, m, d, 0, 0, s))
return (y, m, d, s, a, t)
