https://github.com/hoaproject/Praspel
Tip revision: afe3060c02e3963a3d455d01065b7544d39fa348 authored by Ivan Enderlin on 15 November 2014, 21:22:01 UTC
Hoa\Visitor has been finalized.
Hoa\Visitor has been finalized.
Tip revision: afe3060
WeakStack.php
<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2014, Ivan Enderlin. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Hoa nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
namespace Hoa\Praspel\Iterator {
/**
* Class \Hoa\Praspel\Iterator\WeakStack.
*
* A weak stack is a SplStack with null elements that are not iterated.
*
* @author Ivan Enderlin <ivan.enderlin@hoa-project.net>
* @copyright Copyright © 2007-2014 Ivan Enderlin.
* @license New BSD License
*/
class WeakStack extends \SplStack {
/**
* Skip null elements while validated the current one.
*
* @access public
* @return bool
*/
public function valid ( ) {
while( true === parent::valid()
&& null === $this->current()
&& null === parent::next());
return parent::valid();
}
/**
* Check whether the stack is empty or not.
* An element is present if different of null.
*
* @access public
* @return bool
*/
public function isEmpty ( ) {
foreach($this as $element)
if(null !== $element)
return false;
return true;
}
}
}