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util.py
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# Copyright (C) 2008-2011 AG Projects. See LICENSE for details.
#
"""Implements utilities commonly used in various parts of the library"""
from __future__ import absolute_import
__all__ = ["All", "Any", "MultilingualText", "Timestamp", "user_info"]
import os
import platform
import re
import sys
from application.python.types import Singleton, MarkerType
from datetime import datetime
from dateutil.tz import tzoffset
# Utility classes
#
class All(object):
__metaclass__ = MarkerType
class Any(object):
__metaclass__ = MarkerType
class MultilingualText(unicode):
def __new__(cls, *args, **translations):
if len(args) > 1:
raise TypeError("%s.__new__ takes at most 1 positional argument (%d given)" % (cls.__name__, len(args)))
default = args[0] if args else translations.get('en', u'')
obj = unicode.__new__(cls, default)
obj.translations = translations
return obj
def get_translation(self, language):
return self.translations.get(language, self)
class Timestamp(datetime):
_timestamp_re = re.compile(r'(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})T(?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})(\.(?P<secfrac>\d{1,}))?((?P<UTC>Z)|((?P<tzsign>\+|-)(?P<tzhour>\d{2}):(?P<tzminute>\d{2})))')
@classmethod
def utc_offset(cls):
timediff = datetime.now() - datetime.utcnow()
return int(round((timediff.days*86400 + timediff.seconds + timediff.microseconds/1000000.0)/60))
@classmethod
def parse(cls, stamp):
if stamp is None:
return None
match = cls._timestamp_re.match(stamp)
if match is None:
raise ValueError("Timestamp %s is not in RFC3339 format" % stamp)
dct = match.groupdict()
if dct['UTC'] is not None:
secoffset = 0
else:
secoffset = int(dct['tzminute'])*60 + int(dct['tzhour'])*3600
if dct['tzsign'] == '-':
secoffset *= -1
tzinfo = tzoffset(None, secoffset)
if dct['secfrac'] is not None:
secfrac = dct['secfrac'][:6]
secfrac += '0'*(6-len(secfrac))
secfrac = int(secfrac)
else:
secfrac = 0
dt = datetime(int(dct['year']), month=int(dct['month']), day=int(dct['day']),
hour=int(dct['hour']), minute=int(dct['minute']), second=int(dct['second']),
microsecond=secfrac, tzinfo=tzinfo)
return cls(dt)
@classmethod
def format(cls, dt):
if dt is None:
return None
if dt.tzinfo is not None:
return dt.replace(microsecond=0).isoformat()
minutes = cls.utc_offset()
if minutes == 0:
tzspec = 'Z'
else:
if minutes < 0:
sign = '-'
minutes *= -1
else:
sign = '+'
hours = minutes / 60
minutes = minutes % 60
tzspec = '%s%02d:%02d' % (sign, hours, minutes)
return dt.replace(microsecond=0).isoformat()+tzspec
def __new__(cls, value, *args, **kwargs):
if isinstance(value, cls):
return value
elif isinstance(value, datetime):
return cls(value.year, month=value.month, day=value.day,
hour=value.hour, minute=value.minute, second=value.second,
microsecond=value.microsecond, tzinfo=value.tzinfo)
elif isinstance(value, basestring):
return cls.parse(value)
else:
return datetime.__new__(cls, value, *args, **kwargs)
def __str__(self):
return self.format(self)
# Utility objects
#
class UserInfo(object):
__metaclass__ = Singleton
def __repr__(self):
attribs = ', '.join('%s=%r' % (attr, getattr(self, attr)) for attr in ('username', 'fullname'))
return '%s(%s)' % (self.__class__.__name__, attribs)
@property
def username(self):
if platform.system() == 'Windows':
name = os.getenv('USERNAME')
else:
import pwd
name = pwd.getpwuid(os.getuid()).pw_name
return name.decode(sys.getfilesystemencoding())
@property
def fullname(self):
if platform.system() == 'Windows':
name = os.getenv('USERNAME')
else:
import pwd
name = pwd.getpwuid(os.getuid()).pw_gecos.split(',', 1)[0] or pwd.getpwuid(os.getuid()).pw_name
return name.decode(sys.getfilesystemencoding())
user_info = UserInfo()
del UserInfo

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