genesis-php / genesis

Loader.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 12 and the first side effect is on line 6.

namespace Genesis;

require_once __DIR__ . '/exceptions.php';


/**
 * @author Adam Bisek (adam.bisek@gmail.com)
 */
class Loader
{

	/** @var array */
	private $map;


	public function __construct(array $map = array('Genesis' => __DIR__))
	{
		$this->map = $map;
	}


	/**
	 * Register autoloader.
	 */
	public function register()
	{
		spl_autoload_register(array($this, 'tryLoad'));
		return $this;
	}


	/**
	 * @param  string
	 */
	private function tryLoad($type)
	{
		$type = ltrim($type, '\\');
		foreach ($this->map as $ns => $dir) {
			if ($this->stringStartsWith($type, $ns)) {
				$file = str_replace('\\', DIRECTORY_SEPARATOR, $type) . '.php';
				$file = ltrim(substr($file, strlen($ns) + 1));
				$path = substr($file, 0, strrpos($file, DIRECTORY_SEPARATOR));
				$file = str_replace($path, strtolower($path), $file);
				$file = $dir . DIRECTORY_SEPARATOR . $file;
				if (!is_file($file)) {
					throw new \RuntimeException("File '$file' does not exists.");
				}
				return require_once $file;
			}
		}
	}


	private function stringStartsWith($haystack, $needle)
	{
		return strncmp($haystack, $needle, strlen($needle)) === 0;
	}

}