Basic Smarty and Twig view renderers, docs

docs/view_renderers.md

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+Yii2 view renderers
+===================
+
+By default Yii uses PHP as template language but you can change it in your application.
+The component responsible for rendering a view using custom template enging is
+called `viewRenderer`. You can configure it as follows:
+
+```php
+array(
+	'components' => array(
+		'viewRenderer' => array(
+			'class' => 'yii\renderers\TwigViewRenderer',
+			// or 'class' => 'yii\renderers\SmartyViewRenderer',
+		),
+	),
+)
+```
+
+Twig
+----
+
+In order to use Twig you need to put you templates in files with extension `.twig`.
+Also you need to specify this extension explicitly when calling `$this->render()`
+or `$this->renderPartial()` from your controller.
+
+Smarty
+------
+
+In order to use Smarty you need to put you templates in files with extension `.tpl`.
+Also you need to specify this extension explicitly when calling `$this->render()`
+or `$this->renderPartial()` from your controller.

framework/renderers/SmartyViewRenderer.php

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+<?php
+/**
+ * Smarty view renderer class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\renderers;
+
+use \yii\base\View;
+use \yii\base\ViewRenderer;
+
+/**
+ * SmartyViewRenderer allows you to use Smarty templates in views.
+ *
+ * @author Alexander Makarov <sam@rmcreative.ru>
+ * @since 2.0
+ */
+class SmartyViewRenderer extends ViewRenderer
+{
+	public $smartyDir = '@app/vendors/Smarty';
+	public $cacheDir = '@app/runtime/Smarty/cache';
+	public $compileDir = '@app/runtime/Smarty/compile';
+	public $fileExtension = 'tpl';
+
+	/** @var \Smarty */
+	protected $_smarty;
+
+	public function init()
+	{
+		require_once(\Yii::getAlias($this->smartyDir).'/Smarty.class.php');
+		$this->_smarty = new \Smarty();
+		$this->_smarty->setCompileDir(\Yii::getAlias($this->compileDir));
+		$this->_smarty->setCacheDir(\Yii::getAlias($this->cacheDir));
+	}
+
+	/**
+	 * Renders a view file.
+	 *
+	 * This method is invoked by [[View]] whenever it tries to render a view.
+	 * Child classes must implement this method to render the given view file.
+	 *
+	 * @param View $view the view object used for rendering the file.
+	 * @param string $file the view file.
+	 * @param array $params the parameters to be passed to the view file.
+	 *
+	 * @return string the rendering result
+	 */
+	public function render($view, $file, $params)
+	{
+		$ext = pathinfo($file, PATHINFO_EXTENSION);
+		if($ext === $this->fileExtension) {
+			/** @var \Smarty_Internal_Template $template */
+			$template = $this->_smarty->createTemplate($file, null, null, $params, true);
+			return $template->fetch();
+		}
+		else {
+			return $view->renderPhpFile($file, $params);
+		}
+	}
+}

framework/renderers/TwigViewRenderer.php

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+<?php
+/**
+ * Twig view renderer class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\renderers;
+
+use \yii\base\View;
+use \yii\base\ViewRenderer;
+
+/**
+ * TwigViewRenderer allows you to use Twig templates in views.
+ *
+ * @author Alexander Makarov <sam@rmcreative.ru>
+ * @since 2.0
+ */
+class TwigViewRenderer extends ViewRenderer
+{
+	public $twigDir = '@app/vendors/Twig';
+	public $cacheDir = '@app/runtime/Twig/cache';
+	public $fileExtension = 'twig';
+
+	/**
+	 * @var \Twig_Environment
+	 */
+	protected $_twig;
+
+	public function init()
+	{
+		\Yii::setAlias('@Twig', $this->twigDir);
+
+		$loader = new \Twig_Loader_String();
+		$this->_twig = new \Twig_Environment($loader, array(
+			'cache' => \Yii::getAlias($this->cacheDir),
+		));
+	}
+
+	/**
+	 * Renders a view file.
+	 *
+	 * This method is invoked by [[View]] whenever it tries to render a view.
+	 * Child classes must implement this method to render the given view file.
+	 *
+	 * @param View $view the view object used for rendering the file.
+	 * @param string $file the view file.
+	 * @param array $params the parameters to be passed to the view file.
+	 *
+	 * @return string the rendering result
+	 */
+	public function render($view, $file, $params)
+	{
+		$ext = pathinfo($file, PATHINFO_EXTENSION);
+		if($ext === $this->fileExtension) {
+			return $this->_twig->render(file_get_contents($file), $params);
+		}
+		else {
+			return $view->renderPhpFile($file, $params);
+		}
+	}
+}