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build/ |
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# rfc3339.py -- Implementation of the majority of RFC 3339 for python. | ||
# Copyright (c) 2008, 2009, 2010 LShift Ltd. <query@lshift.net. | ||
# | ||
# Permission is hereby granted, free of charge, to any person obtaining a copy | ||
# of this software and associated documentation files (the "Software"), to deal | ||
# in the Software without restriction, including without limitation the rights | ||
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
# copies of the Software, and to permit persons to whom the Software is | ||
# furnished to do so, subject to the following conditions: | ||
# | ||
# The above copyright notice and this permission notice shall be included in | ||
# all copies or substantial portions of the Software. | ||
# | ||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
# THE SOFTWARE. | ||
|
||
""" | ||
Implementation of the majority of http://www.ietf.org/rfc/rfc3339.txt. | ||
Use datetime.datetime.isoformat() as an inverse of the various parsing | ||
routines in this module. | ||
Limitations, with respect to RFC 3339: | ||
- Section 4.3, "Unknown Local Offset Convention", is not implemented. | ||
- Section 5.6, "Internet Date/Time Format", is the ONLY supported format | ||
implemented by the various parsers in this module. (Section 5.6 is | ||
reproduced in its entirety below.) | ||
- Section 5.7, "Restrictions", is left to the datetime.datetime constructor | ||
to implement, with the exception of limits on timezone | ||
minutes-east-of-UTC magnitude. In particular, leap seconds are not | ||
addressed by this module. (And it appears that they are not supported | ||
by datetime, either.) | ||
Potential Improvements: | ||
- Support for leap seconds. (There's a table of them in RFC 3339 itself, | ||
and http://tf.nist.gov/pubs/bulletin/leapsecond.htm updates monthly.) | ||
Here's an excerpt from RFC 3339 itself: | ||
5.6. Internet Date/Time Format | ||
The following profile of ISO 8601 [ISO8601] dates SHOULD be used in | ||
new protocols on the Internet. This is specified using the syntax | ||
description notation defined in [ABNF]. | ||
date-fullyear = 4DIGIT | ||
date-month = 2DIGIT ; 01-12 | ||
date-mday = 2DIGIT ; 01-28, 01-29, 01-30, 01-31 based on | ||
; month/year | ||
time-hour = 2DIGIT ; 00-23 | ||
time-minute = 2DIGIT ; 00-59 | ||
time-second = 2DIGIT ; 00-58, 00-59, 00-60 based on leap second | ||
; rules | ||
time-secfrac = "." 1*DIGIT | ||
time-numoffset = ("+" / "-") time-hour ":" time-minute | ||
time-offset = "Z" / time-numoffset | ||
partial-time = time-hour ":" time-minute ":" time-second | ||
[time-secfrac] | ||
full-date = date-fullyear "-" date-month "-" date-mday | ||
full-time = partial-time time-offset | ||
date-time = full-date "T" full-time | ||
NOTE: Per [ABNF] and ISO8601, the "T" and "Z" characters in this | ||
syntax may alternatively be lower case "t" or "z" respectively. | ||
This date/time format may be used in some environments or contexts | ||
that distinguish between the upper- and lower-case letters 'A'-'Z' | ||
and 'a'-'z' (e.g. XML). Specifications that use this format in | ||
such environments MAY further limit the date/time syntax so that | ||
the letters 'T' and 'Z' used in the date/time syntax must always | ||
be upper case. Applications that generate this format SHOULD use | ||
upper case letters. | ||
NOTE: ISO 8601 defines date and time separated by "T". | ||
Applications using this syntax may choose, for the sake of | ||
readability, to specify a full-date and full-time separated by | ||
(say) a space character. | ||
""" | ||
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import datetime, time, calendar | ||
import re | ||
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ZERO = datetime.timedelta(0) | ||
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class tzinfo(datetime.tzinfo): | ||
""" | ||
Implementation of a fixed-offset tzinfo. | ||
""" | ||
def __init__(self, minutesEast, name): | ||
""" | ||
minutesEast -> number of minutes east of UTC that this tzinfo represents. | ||
name -> symbolic (but uninterpreted) name of this tzinfo. | ||
""" | ||
self.minutesEast = minutesEast | ||
self.offset = datetime.timedelta(minutes = minutesEast) | ||
self.name = name | ||
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def utcoffset(self, dt): | ||
"""Returns minutesEast from the constructor, as a datetime.timedelta.""" | ||
return self.offset | ||
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def dst(self, dt): | ||
"""This is a fixed offset tzinfo, so always returns a zero timedelta.""" | ||
return ZERO | ||
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def tzname(self, dt): | ||
"""Returns the name from the constructor.""" | ||
return self.name | ||
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def __repr__(self): | ||
"""If minutesEast==0, prints specially as rfc3339.UTC_TZ.""" | ||
if self.minutesEast == 0: | ||
return "rfc3339.UTC_TZ" | ||
else: | ||
return "rfc3339.tzinfo(%s,%s)" % (self.minutesEast, repr(self.name)) | ||
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UTC_TZ = tzinfo(0, 'Z') | ||
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date_re_str = r'(\d\d\d\d)-(\d\d)-(\d\d)' | ||
time_re_str = r'(\d\d):(\d\d):(\d\d)(\.(\d+))?([zZ]|(([-+])(\d\d):(\d\d)))' | ||
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def make_re(*parts): | ||
return re.compile(r'^\s*' + ''.join(parts) + r'\s*$') | ||
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date_re = make_re(date_re_str) | ||
datetime_re = make_re(date_re_str, r'[ tT]', time_re_str) | ||
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def parse_date(s): | ||
""" | ||
Given a string matching the 'full-date' production above, returns | ||
a datetime.date instance. Any deviation from the allowed format | ||
will produce a raised ValueError. | ||
>>> parse_date("2008-08-24") | ||
datetime.date(2008, 8, 24) | ||
>>> parse_date(" 2008-08-24 ") | ||
datetime.date(2008, 8, 24) | ||
>>> parse_date("2008-08-00") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 134, in parse_date | ||
return datetime.date(int(y), int(m), int(d)) | ||
ValueError: day is out of range for month | ||
>>> parse_date("2008-06-31") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 134, in parse_date | ||
return datetime.date(int(y), int(m), int(d)) | ||
ValueError: day is out of range for month | ||
>>> parse_date("2008-13-01") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 134, in parse_date | ||
return datetime.date(int(y), int(m), int(d)) | ||
ValueError: month must be in 1..12 | ||
>>> parse_date("22008-01-01") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 136, in parse_date | ||
raise ValueError('Invalid RFC 3339 date string', s) | ||
ValueError: ('Invalid RFC 3339 date string', '22008-01-01') | ||
>>> parse_date("2008-08-24").isoformat() | ||
'2008-08-24' | ||
""" | ||
m = date_re.match(s) | ||
if m: | ||
(y, m, d) = m.groups() | ||
return datetime.date(int(y), int(m), int(d)) | ||
else: | ||
raise ValueError('Invalid RFC 3339 date string', s) | ||
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def parse_datetime(s): | ||
""" | ||
Given a string matching the 'date-time' production above, returns | ||
a datetime.datetime instance. Any deviation from the allowed | ||
format will produce a raised ValueError. | ||
>>> parse_datetime("2008-08-24T00:00:00Z") | ||
datetime.datetime(2008, 8, 24, 0, 0, tzinfo=rfc3339.UTC_TZ) | ||
>>> parse_datetime(" 2008-08-24T00:00:00Z ") | ||
datetime.datetime(2008, 8, 24, 0, 0, tzinfo=rfc3339.UTC_TZ) | ||
>>> parse_datetime("2008-08-24T00:00:00") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 208, in parse_datetime | ||
raise ValueError('Invalid RFC 3339 datetime string', s) | ||
ValueError: ('Invalid RFC 3339 datetime string', '2008-08-24T00:00:00') | ||
>>> parse_datetime("2008-08-24T00:00:00+00:00") | ||
datetime.datetime(2008, 8, 24, 0, 0, tzinfo=rfc3339.UTC_TZ) | ||
>>> parse_datetime("2008-08-24T00:00:00+01:00") | ||
datetime.datetime(2008, 8, 24, 0, 0, tzinfo=rfc3339.tzinfo(60,'+01:00')) | ||
>>> parse_datetime("2008-08-24T00:00:00-01:00") | ||
datetime.datetime(2008, 8, 24, 0, 0, tzinfo=rfc3339.tzinfo(-60,'-01:00')) | ||
>>> parse_datetime("2008-08-24T24:00:00Z") | ||
Traceback (most recent call last): | ||
File "<stdin>", line 1, in <module> | ||
File "rfc3339.py", line 206, in parse_datetime | ||
tz) | ||
ValueError: hour must be in 0..23 | ||
>>> midnightUTC = parse_datetime("2008-08-24T00:00:00Z") | ||
>>> oneamBST = parse_datetime("2008-08-24T01:00:00+01:00") | ||
>>> midnightUTC == oneamBST | ||
True | ||
>>> elevenpmUTC = parse_datetime("2008-08-23T23:00:00Z") | ||
>>> midnightBST = parse_datetime("2008-08-24T00:00:00+01:00") | ||
>>> midnightBST == elevenpmUTC | ||
True | ||
>>> elevenpmUTC.isoformat() | ||
'2008-08-23T23:00:00+00:00' | ||
>>> oneamBST.isoformat() | ||
'2008-08-24T01:00:00+01:00' | ||
>>> parse_datetime("2008-08-24T00:00:00.123Z").isoformat() | ||
'2008-08-24T00:00:00.123000+00:00' | ||
""" | ||
m = datetime_re.match(s) | ||
if m: | ||
(y, m, d, hour, min, sec, ignore1, frac_sec, wholetz, ignore2, tzsign, tzhour, tzmin) = \ | ||
m.groups() | ||
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if frac_sec: | ||
frac_sec = float("0." + frac_sec) | ||
else: | ||
frac_sec = 0 | ||
microsec = int((frac_sec * 1000000) + 0.5) | ||
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if wholetz == 'z' or wholetz == 'Z': | ||
tz = UTC_TZ | ||
else: | ||
tzhour = int(tzhour) | ||
tzmin = int(tzmin) | ||
offset = tzhour * 60 + tzmin | ||
if offset == 0: | ||
tz = UTC_TZ | ||
else: | ||
if tzhour > 24 or tzmin > 60 or offset > 1439: ## see tzinfo docs for the 1439 part | ||
raise ValueError('Invalid timezone offset', s, wholetz) | ||
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if tzsign == '-': | ||
offset = -offset | ||
tz = tzinfo(offset, wholetz) | ||
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return datetime.datetime(int(y), int(m), int(d), | ||
int(hour), int(min), int(sec), microsec, | ||
tz) | ||
else: | ||
raise ValueError('Invalid RFC 3339 datetime string', s) | ||
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def now(): | ||
"""Return a timezone-aware datetime.datetime object in | ||
rfc3339.UTC_TZ timezone, representing the current moment | ||
(time.time()). Useful as a replacement for the (timezone-unaware) | ||
datetime.datetime.now() method.""" | ||
return utcfromtimestamp(time.time()) | ||
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def utcfromtimestamp(unix_epoch_timestamp): | ||
"""Interprets its argument as a count of seconds elapsed since the | ||
Unix epoch, and returns a datetime.datetime in rfc3339.UTC_TZ | ||
timezone.""" | ||
(y, m, d, hour, min, sec) = time.gmtime(unix_epoch_timestamp)[:6] | ||
return datetime.datetime(y, m, d, hour, min, sec, 0, UTC_TZ) | ||
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def utctotimestamp(dt): | ||
"""Returns a count of the elapsed seconds between the Unix epoch | ||
and the passed-in datetime.datetime object.""" | ||
return calendar.timegm(dt.utctimetuple()) | ||
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def datetimetostr(dt): | ||
"""Return a RFC3339 date-time string corresponding to the given | ||
datetime object.""" | ||
if dt.utcoffset() is not None: | ||
return dt.isoformat() | ||
else: | ||
return "%sZ" % dt.isoformat() | ||
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def timestamptostr(ts): | ||
"""Return a RFC3339 date-time string corresponding to the given | ||
Unix-epoch timestamp.""" | ||
return datetimetostr(utcfromtimestamp(ts)) | ||
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def strtotimestamp(s): | ||
"""Return the Unix-epoch timestamp corresponding to the given RFC3339 | ||
date-time string.""" | ||
return utctotimestamp(parse_datetime(s)) |
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from distutils.core import setup | ||
import os | ||
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setup(name='rfc3339', | ||
version='0.1', | ||
description='Python implementation of RFC 3339', | ||
author='Tony Garnock-Jones', | ||
author_email='tonyg@lshift.net', | ||
url='http://www.lshift.net/', | ||
py_modules=['rfc3339'], | ||
) |