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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\Repeater. * * Repeat an iterator n-times. * * @copyright Copyright © 2007-2017 Hoa community * @license New BSD License */ class Repeater implements Iterator { /** * Current iterator. * * @var \Traversable */ protected $_iterator = null; /** * Maximum repetition. * * @var int */ protected $_n = 1; /** * Current repetition. * * @var int */ protected $_i = 1; /** * Body (callable to execute each time). * * @var callable */ protected $_body = null; /** * Constructor. * * @param \Traversable $iterator Iterator. * @param int $n Repeat $n-times. * @param callable $body Body. * @throws \Hoa\Iterator\Exception */ public function __construct(\Traversable $iterator, $n, $body = null) { if (0 >= $n) { throw new Exception( 'n must be greater than 0, given %d.', 0, $n ); } if ($iterator instanceof \IteratorAggregate) { $iterator = $iterator->getIterator(); } $this->_iterator = $iterator; $this->_n = $n; $this->_body = $body; return; } /** * Return the current element. * * @return mixed */ public function current() { return $this->_iterator->current(); } /** * Return the key of the current element. * * @return mixed */ public function key() { return $this->_iterator->key(); } /** * Move forward to next element. * * @return void */ public function next() { return $this->_iterator->next(); } /** * Rewind the iterator to the first element. * * @return void */ public function rewind() { return $this->_iterator->rewind(); } /** * Check if current position is valid. * * @return bool */ public function valid() { $valid = $this->_iterator->valid(); if (true === $valid) { return true; } if (null !== $this->_body) { $handle = &$this->_body; $handle($this->_i); } $this->rewind(); if ($this->_n <= $this->_i++) { $this->_i = 1; return false; } return true; } }
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