/brz/remove-bazaar

# 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, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Date parsing routines.

Each routine returns timestamp,timezone where

* timestamp is seconds since epoch

* timezone is the offset from UTC in seconds.

"""

import time

def parse_raw(s):

    """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(' ', 1)

    timestamp = float(timestamp_str)

    timezone = _parse_tz(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

    assert len(tz) == 5

    sign = {'+': +1, '-': -1}[tz[0]]

    hours = int(tz[1:3])

    minutes = int(tz[3:])

    return sign * 60 * (60 * hours + minutes)

def parse_rfc2822(s):

    """Parse a date from a rfc2822 string.

    See the spec for details.

    """

    raise NotImplementedError(parse_rfc2822)

def parse_now(s):

    """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 = {

    'raw':      parse_raw,

    'rfc2822':  parse_rfc2822,

    'now':      parse_now,

    }