awsmug/alexa-sdk

<?php

namespace Alexa;

/**
 * Class Skip_Autoloader
 *
 * @since 1.0.0
 *
 * @package Skip
 */
class Autoloader {
    /**
     * Path to library
     *
     * @since 1.0.0
     *
     * @var string
     */
    protected static $dir;

    /**
     * Initializing Autoloader
     *
     * @since 1.0.0
     */
    public static function init() {
        self::$dir = dirname( __FILE__ );
        spl_autoload_register( array( __CLASS__ , 'autoload' ) );
    }

    /**
     * Autoloader function
     *
     * @since 1.0.0
     *
     * @param string $class_name
     *
     * @return bool
     */
    public static function autoload( $class_name ) {
        $parts = explode( '\\', $class_name );

        // Main directory
        $sdk_dir = dirname( __FILE__ );

        // Possible subdirectories in main directory
        $possible_types = array(
            '/classes' => '-class.php',
            '/traits' => '-trait.php',
            '/interfaces'  => '-interface.php',
        );

        // Getting Component directory
        $component_part = '';
        $part_number = 0;
        foreach( $parts AS $part ) {
            if( 'Alexa' === $part ) {
                continue;
            }

            if( $part_number < count( $parts ) ) {
                $component_part .= '/' . str_replace( '_', '-', strtolower( $part ) );
            }
        }

        foreach ( $possible_types AS $dir => $suffix ) {
            $possible_directory = $sdk_dir . $dir;
            $possible_file = $possible_directory . $component_part . $suffix;

            if( file_exists( $possible_file ) ) {
                require_once $possible_file;
                return true;
            }
        }

        return false;
    }
}