Twig Macro

BasePresenter.php

<?php

public function templatePrepareFilters($template) {
	$template->registerFilter($latte = new Nette\Templates\LatteFilter());
	TwigMacro::register($latte->getHandler());
}

TwigMacro.php

<?php

use Nette\Templates\LatteMacros;
use Nette\Debug;



/**
 * @author Pavel Kalvoda
 * @author Filip Procházka
 */
class TwigMacro
{
	const SEPARATOR = '.';

	/** @var Nette\Templates\LatteMacros */
	protected static $latte;



	/**
	 * @param Nette\Templates\LatteMacros $latte
	 */
	public static function register(LatteMacros $latte)
	{
		$latte->macros['~'] = '<?php %' . __CLASS__ . '::expand% ?>';
		$latte->macros['~$'] = '<?php %' . __CLASS__ . '::expand% ?>';

		self::$latte = $latte;
	}



	/**
	 * @param mixed $path
	 * @param mixed $modifiers
	 * @return string
	 */
	public static function expand($path, $modifiers)
	{
		$frags = explode(self::SEPARATOR, $path);
		$result = __CLASS__ . '::travel($' . array_shift($frags) . ', ' . var_export($frags, TRUE) . ')';
		return 'echo ' . self::$latte->formatModifiers($result, $modifiers). ';';
	}



	/**
	 * @param object|array $element
	 * @param array $path
	 * @return mixed
	 */
	public static function travel($element, array $path = array())
	{
		foreach ($path as $leaf) {
			 if ((is_array($element) || $element instanceof \ArrayAccess) && isset($element[$leaf])) { // http://www.php.net/manual/en/function.is-array.php#48083
				$element = $element[$leaf];
				continue;

			} elseif (is_object($element)) {
				if (isset($element->$leaf)) {
					$element = $element->$leaf;
					continue;

				} elseif (method_exists ($object, $method = "get" . ucfirst($leaf))) {
					$element = $element->$method();
					continue;
				}
			}

			throw new \InvalidStateException("Given structure doesn't contain specified offset, property, or getter method.");
		}

		return $element;
	}

}