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# -*- coding: utf-8 -*-
"""
parsedatetime/context.py
Context related classes
"""
from threading import local
class pdtContextStack(object):
"""
A thread-safe stack to store context(s)
Internally used by L{Calendar} object
"""
def __init__(self):
self.__local = local()
@property
def __stack(self):
if not hasattr(self.__local, 'stack'):
self.__local.stack = []
return self.__local.stack
def push(self, ctx):
self.__stack.append(ctx)
def pop(self):
try:
return self.__stack.pop()
except IndexError:
return None
def last(self):
try:
return self.__stack[-1]
except IndexError:
raise RuntimeError('context stack is empty')
def isEmpty(self):
return not self.__stack
class pdtContext(object):
"""
Context contains accuracy flag detected by L{Calendar.parse()}
Accuracy flag uses bitwise-OR operation and is combined by:
ACU_YEAR - "next year", "2014"
ACU_MONTH - "March", "July 2014"
ACU_WEEK - "last week", "next 3 weeks"
ACU_DAY - "tomorrow", "July 4th 2014"
ACU_HALFDAY - "morning", "tonight"
ACU_HOUR - "18:00", "next hour"
ACU_MIN - "18:32", "next 10 minutes"
ACU_SEC - "18:32:55"
ACU_NOW - "now"
"""
__slots__ = ('accuracy',)
ACU_YEAR = 2 ** 0
ACU_MONTH = 2 ** 1
ACU_WEEK = 2 ** 2
ACU_DAY = 2 ** 3
ACU_HALFDAY = 2 ** 4
ACU_HOUR = 2 ** 5
ACU_MIN = 2 ** 6
ACU_SEC = 2 ** 7
ACU_NOW = 2 ** 8
ACU_DATE = ACU_YEAR | ACU_MONTH | ACU_WEEK | ACU_DAY
ACU_TIME = ACU_HALFDAY | ACU_HOUR | ACU_MIN | ACU_SEC | ACU_NOW
_ACCURACY_MAPPING = [
(ACU_YEAR, 'year'),
(ACU_MONTH, 'month'),
(ACU_WEEK, 'week'),
(ACU_DAY, 'day'),
(ACU_HALFDAY, 'halfday'),
(ACU_HOUR, 'hour'),
(ACU_MIN, 'min'),
(ACU_SEC, 'sec'),
(ACU_NOW, 'now')]
_ACCURACY_REVERSE_MAPPING = {
'year': ACU_YEAR,
'years': ACU_YEAR,
'month': ACU_MONTH,
'months': ACU_MONTH,
'week': ACU_WEEK,
'weeks': ACU_WEEK,
'day': ACU_DAY,
'days': ACU_DAY,
'halfday': ACU_HALFDAY,
'morning': ACU_HALFDAY,
'afternoon': ACU_HALFDAY,
'evening': ACU_HALFDAY,
'night': ACU_HALFDAY,
'tonight': ACU_HALFDAY,
'midnight': ACU_HALFDAY,
'hour': ACU_HOUR,
'hours': ACU_HOUR,
'min': ACU_MIN,
'minute': ACU_MIN,
'mins': ACU_MIN,
'minutes': ACU_MIN,
'sec': ACU_SEC,
'second': ACU_SEC,
'secs': ACU_SEC,
'seconds': ACU_SEC,
'now': ACU_NOW}
def __init__(self, accuracy=0):
"""
Default constructor of L{pdtContext} class.
@type accuracy: integer
@param accuracy: Accuracy flag
@rtype: object
@return: L{pdtContext} instance
"""
self.accuracy = accuracy
def updateAccuracy(self, *accuracy):
"""
Updates current accuracy flag
"""
for acc in accuracy:
if not isinstance(acc, int):
acc = self._ACCURACY_REVERSE_MAPPING[acc]
self.accuracy |= acc
def update(self, context):
"""
Uses another L{pdtContext} instance to update current one
"""
self.updateAccuracy(context.accuracy)
@property
def hasDate(self):
"""
Returns True if current context is accurate to date
"""
return bool(self.accuracy & self.ACU_DATE)
@property
def hasTime(self):
"""
Returns True if current context is accurate to time
"""
return bool(self.accuracy & self.ACU_TIME)
@property
def dateTimeFlag(self):
"""
Returns the old date/time flag code
"""
return int(self.hasDate and 1) | int(self.hasTime and 2)
@property
def hasDateOrTime(self):
"""
Returns True if current context is accurate to date/time
"""
return bool(self.accuracy)
def __repr__(self):
accuracy_repr = []
for acc, name in self._ACCURACY_MAPPING:
if acc & self.accuracy:
accuracy_repr.append('pdtContext.ACU_%s' % name.upper())
if accuracy_repr:
accuracy_repr = 'accuracy=' + ' | '.join(accuracy_repr)
else:
accuracy_repr = ''
return 'pdtContext(%s)' % accuracy_repr
def __eq__(self, ctx):
return self.accuracy == ctx.accuracy