dir/src/Rendering/View.php

<?php

namespace Friendica\Directory\Rendering;

use \Closure;

/**
 * This class with insert data in a two-step view.
 */
class View
{
	#TODO: Replace this with better code.

	protected $layout;
	protected $view;
	protected $helpers;

	public static function getViewPath($name)
	{
		return dirname(__DIR__) . '/templates/view/' . $name . '.php';
	}

	public static function getLayoutPath($name)
	{
		return dirname(__DIR__) . '/templates/layout/' . $name . '.php';
	}

	public function getHelpers()
	{
		return $this->helpers;
	}

	public function addHelper($name, Closure $helper)
	{
		$this->helpers[$name] = $helper;
	}

	public function getView()
	{
		return $this->view;
	}

	public function setView($value)
	{
		$this->view = $value;
	}

	public function getLayout()
	{
		return $this->layout;
	}

	public function setLayout($value)
	{
		$this->layout = $value;
	}

	public function __construct($view = null, $layout = "default")
	{
		$this->view = $view;
		$this->layout = $layout;
		$this->helpers = array();
	}

	public function render(array $data = array())
	{
		//First the outer view.
		$view = self::getViewPath($this->view);
		$viewContent = $this->encapsulatedRequire($view, $data);

		//Then the layout, including the view as $content.
		$data['content'] = $viewContent;
		$layout = self::getLayoutPath($this->layout);
		return $this->encapsulatedRequire($layout, $data);
	}

	public function output(array $data = array())
	{
		header("Content-type: text/html; charset=utf-8");
		echo $this->render($data);
	}

	public function encapsulatedRequire($filename, array $data = null)
	{
		//This will provide our variables on the global scope.
		$call = function($__FILE__, $__VARS__) {
			extract($__VARS__, EXTR_SKIP);
			require $__FILE__;
		};

		//Use our current data as fallback.
		if (!is_array($data)) {
			$data = $this->currentData;
		}

		//This will add the helper class to $this.
		$helpers = new ViewHelpers($this, $data);
		$call = $call->bindTo($helpers, get_class($helpers));

		//Run and return the value.
		ob_start();
		$call($filename, $data);
		return ob_get_clean();
	}
}