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comparison hgext3rd/fastimport/vendor/python_fastimport/dates.py @ 86:28704a2a7461 vendor/python-fastimport

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Import python-fastimport-0.9.8
author Roy Marples <roy@marples.name>
date Tue, 19 Jan 2021 22:56:34 +0000
parents
children 2fc99e3479d9
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85:1f5544a8870b 86:28704a2a7461
1 # Copyright (C) 2008 Canonical Ltd
2 #
3 # This program is free software; you can redistribute it and/or modify
4 # it under the terms of the GNU General Public License as published by
5 # the Free Software Foundation; either version 2 of the License, or
6 # (at your option) any later version.
7 #
8 # This program is distributed in the hope that it will be useful,
9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 # GNU General Public License for more details.
12 #
13 # You should have received a copy of the GNU General Public License
14 # along with this program. If not, see <http://www.gnu.org/licenses/>.
15
16 """Date parsing routines.
17
18 Each routine represents a date format that can be specified in a
19 stream using the date-format feature. The return value is
20 timestamp,timezone where
21
22 * timestamp is seconds since epoch
23 * timezone is the offset from UTC in seconds.
24 """
25 import time
26
27 from fastimport import errors
28
29
30 def parse_raw(s, lineno=0):
31 """Parse a date from a raw string.
32
33 The format must be exactly "seconds-since-epoch offset-utc".
34 See the spec for details.
35 """
36 timestamp_str, timezone_str = s.split(b' ', 1)
37 timestamp = float(timestamp_str)
38 try:
39 timezone = parse_tz(timezone_str)
40 except ValueError:
41 raise errors.InvalidTimezone(lineno, timezone_str)
42 return timestamp, timezone
43
44
45 def parse_tz(tz):
46 """Parse a timezone specification in the [+|-]HHMM format.
47
48 :return: the timezone offset in seconds.
49 """
50 # from git_repository.py in bzr-git
51 sign_byte = tz[0:1]
52 # in python 3 b'+006'[0] would return an integer,
53 # but b'+006'[0:1] return a new bytes string.
54 if sign_byte not in (b'+', b'-'):
55 raise ValueError(tz)
56
57 sign = {b'+': +1, b'-': -1}[sign_byte]
58 hours = int(tz[1:-2])
59 minutes = int(tz[-2:])
60
61 return sign * 60 * (60 * hours + minutes)
62
63
64 def parse_rfc2822(s, lineno=0):
65 """Parse a date from a rfc2822 string.
66
67 See the spec for details.
68 """
69 raise NotImplementedError(parse_rfc2822)
70
71
72 def parse_now(s, lineno=0):
73 """Parse a date from a string.
74
75 The format must be exactly "now".
76 See the spec for details.
77 """
78 return time.time(), 0
79
80
81 # Lookup tabel of date parsing routines
82 DATE_PARSERS_BY_NAME = {
83 u'raw': parse_raw,
84 u'rfc2822': parse_rfc2822,
85 u'now': parse_now,
86 }