vendor/symfony/property-access/PropertyPath.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\PropertyAccess;

use Symfony\Component\PropertyAccess\Exception\InvalidArgumentException;
use Symfony\Component\PropertyAccess\Exception\InvalidPropertyPathException;
use Symfony\Component\PropertyAccess\Exception\OutOfBoundsException;

/**
 * Default implementation of {@link PropertyPathInterface}.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class PropertyPath implements \IteratorAggregate, PropertyPathInterface
{
    /**
     * Character used for separating between plural and singular of an element.
     */
    const SINGULAR_SEPARATOR = '|';

    /**
     * The elements of the property path.
     *
     * @var array
     */
    private $elements = array();

    /**
     * The number of elements in the property path.
     *
     * @var int
     */
    private $length;

    /**
     * Contains a Boolean for each property in $elements denoting whether this
     * element is an index. It is a property otherwise.
     *
     * @var array
     */
    private $isIndex = array();

    /**
     * String representation of the path.
     *
     * @var string
     */
    private $pathAsString;

    /**
     * Constructs a property path from a string.