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