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<?php /** * Hoa * * * @license * * New BSD License * * Copyright © 2007-2017, Hoa community. 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\Iterator; /** * Class \Hoa\Iterator\Counter. * * A counter. * * @copyright Copyright © 2007-2017 Hoa community * @license New BSD License */ class Counter implements Iterator { /** * From (lower bound). * * @var int */ protected $_from = 0; /** * Current key. * * @var int */ protected $_key = 0; /** * Current index. * * @var int */ protected $_i = 0; /** * To (upper bound). * * @var int */ protected $_to = 0; /** * Step. * * @var int */ protected $_step = 0; /** * Constructor. * Equivalent to: * for($i = $from; $i < $to; $i += $step) * * @param int $from Start value. * @param int $to Maximum value. * @param int $step Step. * @throws \Hoa\Iterator\Exception */ public function __construct($from, $to, $step) { if ($step <= 0) { throw new Exception( 'The step must be non-negative; given %d.', 0, $step ); } $this->_from = $from; $this->_to = $to; $this->_step = $step; return; } /** * Return the current element. * * @return int */ public function current() { return $this->_i; } /** * Return the key of the current element. * * @return int */ public function key() { return $this->_key; } /** * Move forward to next element. * * @return void */ public function next() { ++$this->_key; $this->_i += $this->_step; return; } /** * Rewind the iterator to the first element. * * @return void */ public function rewind() { $this->_key = 0; $this->_i = $this->_from; return; } /** * Check if current position is valid. * * @return bool */ public function valid() { return $this->_i < $this->_to; } }
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