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<?php
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/*
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 * This file is part of Mustache.php.
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 *
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 * (c) 2010-2017 Justin Hileman
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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/**
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 * Mustache class autoloader.
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 */
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class Mustache_Autoloader
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{
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    private $baseDir;
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    /**
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     * An array where the key is the baseDir and the key is an instance of this
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     * class.
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     *
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     * @var array
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     */
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    private static $instances;
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    /**
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     * Autoloader constructor.
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     *
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     * @param string $baseDir Mustache library base directory (default: dirname(__FILE__).'/..')
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     */
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    public function __construct($baseDir = null)
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    {
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        if ($baseDir === null) {
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            $baseDir = dirname(__FILE__) . '/..';
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        }
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        // realpath doesn't always work, for example, with stream URIs
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        $realDir = realpath($baseDir);
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        if (is_dir($realDir)) {
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            $this->baseDir = $realDir;
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        } else {
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            $this->baseDir = $baseDir;
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        }
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    }
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    /**
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     * Register a new instance as an SPL autoloader.
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     *
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     * @param string $baseDir Mustache library base directory (default: dirname(__FILE__).'/..')
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     *
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     * @return Mustache_Autoloader Registered Autoloader instance
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     */
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    public static function register($baseDir = null)
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    {
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        $key = $baseDir ? $baseDir : 0;
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        if (!isset(self::$instances[$key])) {
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            self::$instances[$key] = new self($baseDir);
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        }
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        $loader = self::$instances[$key];
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        spl_autoload_register(array($loader, 'autoload'));
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        return $loader;
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    }
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    /**
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     * Autoload Mustache classes.
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     *
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     * @param string $class
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     */
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    public function autoload($class)
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    {
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        if ($class[0] === '\\') {
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            $class = substr($class, 1);
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        }
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        if (strpos($class, 'Mustache') !== 0) {
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            return;
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        }
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        $file = sprintf('%s/%s.php', $this->baseDir, str_replace('_', '/', $class));
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        if (is_file($file)) {
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            require $file;
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        }
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    }
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}