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# Copyright (C) 2008 Canonical Ltd
#
# 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 2 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/>.
"""Date parsing routines.
Each routine represents a date format that can be specified in a
stream using the date-format feature. The return value is
timestamp,timezone where
* timestamp is seconds since epoch
* timezone is the offset from UTC in seconds.
"""
import time
from fastimport import errors
def parse_raw(s, lineno=0):
"""Parse a date from a raw string.
The format must be exactly "seconds-since-epoch offset-utc".
See the spec for details.
"""
timestamp_str, timezone_str = s.split(b' ', 1)
timestamp = float(timestamp_str)
try:
timezone = parse_tz(timezone_str)
except ValueError:
raise errors.InvalidTimezone(lineno, timezone_str)
return timestamp, timezone
def parse_tz(tz):
"""Parse a timezone specification in the [+|-]HHMM format.
:return: the timezone offset in seconds.
"""
# from git_repository.py in bzr-git
sign_byte = tz[0:1]
# in python 3 b'+006'[0] would return an integer,
# but b'+006'[0:1] return a new bytes string.
if sign_byte not in (b'+', b'-'):
raise ValueError(tz)
sign = {b'+': +1, b'-': -1}[sign_byte]
hours = int(tz[1:-2])
minutes = int(tz[-2:])
return sign * 60 * (60 * hours + minutes)
def parse_rfc2822(s, lineno=0):
"""Parse a date from a rfc2822 string.
See the spec for details.
"""
raise NotImplementedError(parse_rfc2822)
def parse_now(s, lineno=0):
"""Parse a date from a string.
The format must be exactly "now".
See the spec for details.
"""
return time.time(), 0
# Lookup tabel of date parsing routines
DATE_PARSERS_BY_NAME = {
u'raw': parse_raw,
u'rfc2822': parse_rfc2822,
u'now': parse_now,
}
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