vendor/symfony/property-access/PropertyPathBuilder.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\OutOfBoundsException;

/**
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class PropertyPathBuilder
{
    private $elements = array();
    private $isIndex = array();

    /**
     * Creates a new property path builder.
     *
     * @param PropertyPathInterface|string|null $path The path to initially store
     *                                                in the builder. Optional.
     */
    public function __construct($path = null)
    {
        if (null !== $path) {
            $this->append($path);
        }
    }

    /**
     * Appends a (sub-) path to the current path.
     *
     * @param PropertyPathInterface|string $path   The path to append
     * @param int                          $offset The offset where the appended
     *                                             piece starts in $path
     * @param int                          $length The length of the appended piece
     *                                             If 0, the full path is appended
     */
    public function append($path, $offset = 0, $length = 0)
    {
        if (\is_string($path)) {
            $path = new PropertyPath($path);
        }

        if (0 === $length) {
            $end = $path->getLength();
        } else {
            $end = $offset + $length;
        }

        for (; $offset < $end; ++$offset) {
            $this->elements[] = $path->getElement($offset);
            $this->isIndex[] = $path->isIndex($offset);