# -*- coding: latin-1 -*-
""" 
   Copyright (C) 2003 PimenTech SARL (http://www.pimentech.net)

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  
"""

__version__='$Revision: 1.3 $'[11:-2]

from Products.PimenTechLibCommon.object import Object

class Stack(Object):
	"a stack class (based on list)"

	meta_type = 'Stack'
	stack = []
	
	def push(self, object):
		self.stack.append(object)

	def pop(self):
		top = self.stack[-1]
		del self.stack[-1]
		return top

	def top(self):
		return self.stack[-1]
	
	def empty(self):
		return not self.stack