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comparison env/lib/python3.7/site-packages/isodate/isoduration.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 ##############################################################################
2 # Copyright 2009, Gerhard Weis
3 # All rights reserved.
4 #
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions are met:
7 #
8 # * Redistributions of source code must retain the above copyright notice,
9 # this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above copyright notice,
11 # this list of conditions and the following disclaimer in the documentation
12 # and/or other materials provided with the distribution.
13 # * Neither the name of the authors nor the names of its contributors
14 # may be used to endorse or promote products derived from this software
15 # without specific prior written permission.
16 #
17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 # CONTRACT, STRICT LIABILITY, OR TORT
26 ##############################################################################
27 '''
28 This module provides an ISO 8601:2004 duration parser.
29
30 It also provides a wrapper to strftime. This wrapper makes it easier to
31 format timedelta or Duration instances as ISO conforming strings.
32 '''
33 from datetime import timedelta
34 from decimal import Decimal
35 import re
36
37 from six import string_types
38
39 from isodate.duration import Duration
40 from isodate.isoerror import ISO8601Error
41 from isodate.isodatetime import parse_datetime
42 from isodate.isostrf import strftime, D_DEFAULT
43
44 ISO8601_PERIOD_REGEX = re.compile(
45 r"^(?P<sign>[+-])?"
46 r"P(?!\b)"
47 r"(?P<years>[0-9]+([,.][0-9]+)?Y)?"
48 r"(?P<months>[0-9]+([,.][0-9]+)?M)?"
49 r"(?P<weeks>[0-9]+([,.][0-9]+)?W)?"
50 r"(?P<days>[0-9]+([,.][0-9]+)?D)?"
51 r"((?P<separator>T)(?P<hours>[0-9]+([,.][0-9]+)?H)?"
52 r"(?P<minutes>[0-9]+([,.][0-9]+)?M)?"
53 r"(?P<seconds>[0-9]+([,.][0-9]+)?S)?)?$")
54 # regular expression to parse ISO duartion strings.
55
56
57 def parse_duration(datestring):
58 """
59 Parses an ISO 8601 durations into datetime.timedelta or Duration objects.
60
61 If the ISO date string does not contain years or months, a timedelta
62 instance is returned, else a Duration instance is returned.
63
64 The following duration formats are supported:
65 -PnnW duration in weeks
66 -PnnYnnMnnDTnnHnnMnnS complete duration specification
67 -PYYYYMMDDThhmmss basic alternative complete date format
68 -PYYYY-MM-DDThh:mm:ss extended alternative complete date format
69 -PYYYYDDDThhmmss basic alternative ordinal date format
70 -PYYYY-DDDThh:mm:ss extended alternative ordinal date format
71
72 The '-' is optional.
73
74 Limitations: ISO standard defines some restrictions about where to use
75 fractional numbers and which component and format combinations are
76 allowed. This parser implementation ignores all those restrictions and
77 returns something when it is able to find all necessary components.
78 In detail:
79 it does not check, whether only the last component has fractions.
80 it allows weeks specified with all other combinations
81
82 The alternative format does not support durations with years, months or
83 days set to 0.
84 """
85 if not isinstance(datestring, string_types):
86 raise TypeError("Expecting a string %r" % datestring)
87 match = ISO8601_PERIOD_REGEX.match(datestring)
88 if not match:
89 # try alternative format:
90 if datestring.startswith("P"):
91 durdt = parse_datetime(datestring[1:])
92 if durdt.year != 0 or durdt.month != 0:
93 # create Duration
94 ret = Duration(days=durdt.day, seconds=durdt.second,
95 microseconds=durdt.microsecond,
96 minutes=durdt.minute, hours=durdt.hour,
97 months=durdt.month, years=durdt.year)
98 else: # FIXME: currently not possible in alternative format
99 # create timedelta
100 ret = timedelta(days=durdt.day, seconds=durdt.second,
101 microseconds=durdt.microsecond,
102 minutes=durdt.minute, hours=durdt.hour)
103 return ret
104 raise ISO8601Error("Unable to parse duration string %r" % datestring)
105 groups = match.groupdict()
106 for key, val in groups.items():
107 if key not in ('separator', 'sign'):
108 if val is None:
109 groups[key] = "0n"
110 # print groups[key]
111 if key in ('years', 'months'):
112 groups[key] = Decimal(groups[key][:-1].replace(',', '.'))
113 else:
114 # these values are passed into a timedelta object,
115 # which works with floats.
116 groups[key] = float(groups[key][:-1].replace(',', '.'))
117 if groups["years"] == 0 and groups["months"] == 0:
118 ret = timedelta(days=groups["days"], hours=groups["hours"],
119 minutes=groups["minutes"], seconds=groups["seconds"],
120 weeks=groups["weeks"])
121 if groups["sign"] == '-':
122 ret = timedelta(0) - ret
123 else:
124 ret = Duration(years=groups["years"], months=groups["months"],
125 days=groups["days"], hours=groups["hours"],
126 minutes=groups["minutes"], seconds=groups["seconds"],
127 weeks=groups["weeks"])
128 if groups["sign"] == '-':
129 ret = Duration(0) - ret
130 return ret
131
132
133 def duration_isoformat(tduration, format=D_DEFAULT):
134 '''
135 Format duration strings.
136
137 This method is just a wrapper around isodate.isostrf.strftime and uses
138 P%P (D_DEFAULT) as default format.
139 '''
140 # TODO: implement better decision for negative Durations.
141 # should be done in Duration class in consistent way with timedelta.
142 if (((isinstance(tduration, Duration) and
143 (tduration.years < 0 or tduration.months < 0 or
144 tduration.tdelta < timedelta(0))) or
145 (isinstance(tduration, timedelta) and
146 (tduration < timedelta(0))))):
147 ret = '-'
148 else:
149 ret = ''
150 ret += strftime(tduration, format)
151 return ret