twig implementation

vendor/symfony/twig-bridge/Symfony/Bridge/Twig/TwigEngine.php

@@ -0,0 +1,126 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\Twig;
+
+use Symfony\Component\Templating\EngineInterface;
+use Symfony\Component\Templating\StreamingEngineInterface;
+use Symfony\Component\Templating\TemplateNameParserInterface;
+
+/**
+ * This engine knows how to render Twig templates.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TwigEngine implements EngineInterface, StreamingEngineInterface
+{
+    protected $environment;
+    protected $parser;
+
+    /**
+     * Constructor.
+     *
+     * @param \Twig_Environment           $environment A \Twig_Environment instance
+     * @param TemplateNameParserInterface $parser      A TemplateNameParserInterface instance
+     */
+    public function __construct(\Twig_Environment $environment, TemplateNameParserInterface $parser)
+    {
+        $this->environment = $environment;
+        $this->parser = $parser;
+    }
+
+    /**
+     * Renders a template.
+     *
+     * @param mixed $name       A template name
+     * @param array $parameters An array of parameters to pass to the template
+     *
+     * @return string The evaluated template as a string
+     *
+     * @throws \InvalidArgumentException if the template does not exist
+     * @throws \RuntimeException         if the template cannot be rendered
+     */
+    public function render($name, array $parameters = array())
+    {
+        return $this->load($name)->render($parameters);
+    }
+
+    /**
+     * Streams a template.
+     *
+     * @param mixed $name       A template name or a TemplateReferenceInterface instance
+     * @param array $parameters An array of parameters to pass to the template
+     *
+     * @throws \RuntimeException if the template cannot be rendered
+     */
+    public function stream($name, array $parameters = array())
+    {
+        $this->load($name)->display($parameters);
+    }
+
+    /**
+     * Returns true if the template exists.
+     *
+     * @param mixed $name A template name
+     *
+     * @return Boolean true if the template exists, false otherwise
+     */
+    public function exists($name)
+    {
+        try {
+            $this->load($name);
+        } catch (\InvalidArgumentException $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns true if this class is able to render the given template.
+     *
+     * @param string $name A template name
+     *
+     * @return Boolean True if this class supports the given resource, false otherwise
+     */
+    public function supports($name)
+    {
+        if ($name instanceof \Twig_Template) {
+            return true;
+        }
+
+        $template = $this->parser->parse($name);
+
+        return 'twig' === $template->get('engine');
+    }
+
+    /**
+     * Loads the given template.
+     *
+     * @param mixed $name A template name or an instance of Twig_Template
+     *
+     * @return \Twig_TemplateInterface A \Twig_TemplateInterface instance
+     *
+     * @throws \InvalidArgumentException if the template does not exist
+     */
+    protected function load($name)
+    {
+        if ($name instanceof \Twig_Template) {
+            return $name;
+        }
+
+        try {
+            return $this->environment->loadTemplate($name);
+        } catch (\Twig_Error_Loader $e) {
+            throw new \InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
+        }
+    }
+}