<?php

/*
FileArts
Copyright (C) 2007 Peter Goodman, Geoffrey Goodman

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

class FAStack {
	var $_items = array();
	var $_size = 0;

	function _update() {
		$this->_size = sizeof($this->_items);
	}

	function pop() {
        $ret = FALSE;
        
        if ($this->_size > 0)
            $ret = TRUE;
        
		array_pop($this->_items);
		$this->_update();

		return $ret;
	}

	function push($value) {
		$this->_items[] = $value;
		$this->_update();
	}

	function pushRef(&$value) {
		$this->_items[] = &$value;
		$this->_update();
	}

	function &top() {
        $ret = NULL;
        
		if ($this->_size > 0)
			$ret = &$this->_items[$this->_size - 1];
        
        return $ret;
	}
}

?>