98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
# Relational
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# Copyright (C) 2008 Salvo "LtWorf" Tomaselli
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#
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# Relation is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
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'''Custom types for relational algebra'''
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import datetime
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class rstring (str):
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'''String subclass with some custom methods'''
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def isFloat(self):
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'''True if the string is a float number, false otherwise'''
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lst=('0','1','2','3','4','5','6','7','8','9','.')
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for i in self:
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if i not in lst:
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return False;
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return True;
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class rdate (object):
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'''Represents a date'''
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def __init__(self,date):
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sep=('-','/','\\')
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splitter=None
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for i in sep:
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if i in date:
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splitter=i
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break;
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elems=date.split(splitter)
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year=int(elems[0])
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month=int(elems[1])
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day=int(elems[2])
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self.intdate=datetime.date(year,month,day)
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self.day= self.intdate.day
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self.month=self.intdate.month
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self.weekday=self.intdate.weekday()
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self.year=self.intdate.year
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def __str__(self):
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return self.intdate.__str__()
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def __add__(self,days):
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res=self.intdate+datetime.timedelta(days)
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return rdate(res.__str__())
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def __eq__(self,other):
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return self.intdate==other.intdate
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def __ge__(self,other):
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return self.intdate>=other.intdate
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def __gt__ (self,other):
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return self.intdate>other.intdate
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def __le__ (self,other):
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return self.intdate<=other.intdate
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def __lt__ (self,other):
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return self.intdate<other.intdate
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def __ne__(self,other):
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return self.intdate!=other.intdate
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def __sub__ (self,other):
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return (self.intdate-other.intdate).days
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def isDate(date):
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sep=('-','/','\\')
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splitter=None
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for i in sep:
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if i in date:
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splitter=i
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break;
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elems=date.split(splitter)
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if len(elems)!=3:
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return False #Wrong number of elements
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year=elems[0]
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month=elems[1]
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day=elems[2]
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if not (year.isdigit() and month.isdigit() and day.isdigit()):
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return False
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year=int(year)
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month=int(month)
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day=int(day)
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if year<datetime.MINYEAR or year>datetime.MAXYEAR:
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return False
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if month<1 or month>12:
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return False
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if day<1 or day >31:
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return False
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return True |