PHP: Tetris WordPress Shortcode

tetris-plugin.php

<?php
/**
 * Plugin Name: Tetris
 * Plugin URI: http://wpsmith.net/
 * Description: Adds tetris game shortcode.
 * Version: 0.0.1
 * Author: Travis Smith, WP Smith
 * Author URI: http://wpsmith.net
 * Text Domain: tetris
 *
 * @copyright 2015
 * @author Travis Smith
 * @link http://wpsmith.net/
 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

/**
 * Core Plugin File
 *
 * @package      Tetris
 * @author       Travis Smith <t@wpsmith.net>
 * @copyright    Copyright (c) 2015, Travis Smith
 * @license      http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since        1.0.0
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

define( 'TETRIS_VERSION', '0.0.1' );
define( 'TETRIS_SLUG', 'tetris' );
define( 'TETRIS_FILE', __FILE__ );

spl_autoload_register( 'tetris_autoload' );
/**
 *  SPL Class Autoloader for classes.
 *
 *  @param string $class_name Class name being autoloaded.
 *  @link http://us1.php.net/spl_autoload_register
 *  @author	Travis Smith
 *  @since 0.1.0
 */
function tetris_autoload( $class_name ) {

	// Do nothing if class already exists, not prefixed WPS_
	if ( class_exists( $class_name, false ) ||
	     ( !class_exists( $class_name, false ) && false === strpos( $class_name, 'Tetris_' ) ) ) {
		return;
	}

	// Set file
	$file = plugin_dir_path( __FILE__ ) . "includes/classes/$class_name.php";

	// Load file
	if ( file_exists( $file ) ) {
		include_once( $file );
	}

}

new Tetris_Shortcode();

Tetris_Shortcode.php

<?php

/**
 * Class Tetris_Shortcode
 */
class Tetris_Shortcode {

	/**
	 * Whether in debug mode or not.
	 * @var bool
	 */
	public $debug = false;

	/**
	 * Whether scripts have been registered.
	 * @var bool
	 */
	public $scripts_registered = false;

	/**
	 * Whether scripts have been enqueued.
	 * @var bool
	 */
	public $scripts_enqueued = false;

	/**
	 * Constructor
	 */
	public function __construct() {
		// Add the shortcode
		add_shortcode( 'tetris', array( $this, 'shortcode' ) );

		// Set debug class var.
		$this->debug = ( ( defined( 'WP_DEBUG' ) && WP_DEBUG ) || ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) );

		// Register scripts!!
		add_action( 'init', array( $this, 'register_scripts' ), 11 );
	}

	/**
	 * Register the scripts
	 *
	 * @uses wp_register_script
	 * @uses wp_localize_script
	 */
	public function register_scripts() {
		if ( $this->scripts_registered ) {
			return;
		}

		/* SCRIPTS */
		$suffix = $this->debug ? '.js' : '.min.js';
		wp_register_script(
			'jgestures',
			plugins_url( "js/jgestures$suffix", TETRIS_FILE ),
			array( 'jquery', ),
			filemtime( plugin_dir_path( TETRIS_FILE ) . "js/jgestures$suffix" ),
			false
		);

		wp_register_script(
			'blockrain',
			plugins_url( "js/jquery.blockrain$suffix", TETRIS_FILE ),
			array( 'jquery', 'jquery-ui-widget', 'jgestures', ),
			filemtime( plugin_dir_path( TETRIS_FILE ) . "js/jquery.blockrain$suffix" ),
			false
		);
		wp_register_script(
			'blockrain-init',
			plugins_url( "js/blockrain.init$suffix", TETRIS_FILE ),
			array( 'blockrain', ),
			filemtime( plugin_dir_path( TETRIS_FILE ) . "js/blockrain.init$suffix" ),
			false
		);

		$args = array(
			'playText'          => __( 'Let\'s play some Tetris', TETRIS_SLUG ),
			'playButtonText'    => __( 'Play', TETRIS_SLUG ),
			'gameOverText'      => __( 'Game Over', TETRIS_SLUG ),
			'restartButtonText' => __( 'Play Again', TETRIS_SLUG ),
			'scoreText'         => __( 'Score', TETRIS_SLUG ),
		);
		wp_localize_script( 'blockrain-init', 'blockrainI10n', $args );


		/* STYLES */
		$suffix = $this->debug ? '.css' : '.min.css';
		wp_register_style(
			'blockrain',
			plugins_url( "css/blockrain$suffix", TETRIS_FILE ),
			null,
			filemtime( plugin_dir_path( TETRIS_FILE ) . "css/blockrain$suffix" )
		);

	}

	/**
	 * Output the scripts for WordPress
	 *
	 * @uses wp_enqueue_script
	 */
	public function enqueue_scripts() {
		if ( $this->scripts_enqueued ) {
			return;
		}
		// Ensure scripts are registered
		$this->register_scripts();

		/* SCRIPTS */
		wp_enqueue_script( 'blockrain-init' );

		/* STYLES */
		wp_enqueue_style( 'blockrain' );

		// Prevent redundant calls
		$this->scripts_enqueued = true;
	}

	/**
	 * Returns the HTML markup for the shortcode.
	 *
	 * @param array       $atts Array of attributes (height, width).
	 * @param string $content Content string. N/A.
	 *
	 * @return string HTML markup.
	 */
	public function shortcode( $atts, $content = '' ) {
		// Parse the attributes with defaults
		$atts = shortcode_atts( array(
			'height' => '100%',
			'width'  => '100%'
		), $atts, 'tetris' );

		// Output the script
		$this->enqueue_scripts();

		// Return the simple markup
		return sprintf( '<div class="tetris-game" style="max-width:%s; max-height:%s;"></div>', $atts['width'], $atts['height'] );
	}

}