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Current File : //usr/share/php/Composer/DependencyResolver/RuleSetIterator.php

<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <[email protected]>
 *     Jordi Boggiano <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\DependencyResolver;

/**
 * @author Nils Adermann <[email protected]>
 */
class RuleSetIterator implements \Iterator
{
    protected $rules;
    protected $types;

    protected $currentOffset;
    protected $currentType;
    protected $currentTypeOffset;

    public function __construct(array $rules)
    {
        $this->rules = $rules;
        $this->types = array_keys($rules);
        sort($this->types);

        $this->rewind();
    }

    public function current()
    {
        return $this->rules[$this->currentType][$this->currentOffset];
    }

    public function key()
    {
        return $this->currentType;
    }

    public function next()
    {
        $this->currentOffset++;

        if (!isset($this->rules[$this->currentType])) {
            return;
        }

        if ($this->currentOffset >= \count($this->rules[$this->currentType])) {
            $this->currentOffset = 0;

            do {
                $this->currentTypeOffset++;

                if (!isset($this->types[$this->currentTypeOffset])) {
                    $this->currentType = -1;
                    break;
                }

                $this->currentType = $this->types[$this->currentTypeOffset];
            } while (isset($this->types[$this->currentTypeOffset]) && !\count($this->rules[$this->currentType]));
        }
    }

    public function rewind()
    {
        $this->currentOffset = 0;

        $this->currentTypeOffset = -1;
        $this->currentType = -1;

        do {
            $this->currentTypeOffset++;

            if (!isset($this->types[$this->currentTypeOffset])) {
                $this->currentType = -1;
                break;
            }

            $this->currentType = $this->types[$this->currentTypeOffset];
        } while (isset($this->types[$this->currentTypeOffset]) && !\count($this->rules[$this->currentType]));
    }

    public function valid()
    {
        return isset($this->rules[$this->currentType], $this->rules[$this->currentType][$this->currentOffset]);
    }
}

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