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<?php

/* Copyright (c) 2019 Geert Bergman (geert@scrivo.nl), highlight.php
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of "highlight.js", "highlight.php", 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 HOLDER OR 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 Highlight;

/**
 * @internal
 *
 * @implements \ArrayAccess<int, string|null>
 * @implements \IteratorAggregate<int, string|null>
 *
 * @since 9.16.0.0
 */
class RegExMatch implements \ArrayAccess, \Countable, \IteratorAggregate
{
    /** @var array<int, string|null> */
    private $data;

    /** @var int */
    public $index;

    /** @var string */
    public $input;

    /**
     * @param array<int, string|null> $results
     */
    public function __construct(array $results)
    {
        $this->data = $results;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return new \ArrayIterator($this->data);
    }

    /**
     * {@inheritdoc}
     */
    public function offsetExists($offset)
    {
        return isset($this->data[$offset]);
    }

    /**
     * {@inheritdoc}
     */
    public function offsetGet($offset)
    {
        return $this->data[$offset];
    }

    /**
     * {@inheritdoc}
     */
    public function offsetSet($offset, $value)
    {
        throw new \LogicException(__CLASS__ . ' instances are read-only.');
    }

    /**
     * {@inheritdoc}
     */
    public function offsetUnset($offset)
    {
        throw new \LogicException(__CLASS__ . ' instances are read-only.');
    }

    /**
     * {@inheritdoc}
     *
     * @return int
     */
    public function count()
    {
        return count($this->data);
    }
}