13 files changed, 346 insertions, 111 deletions
diff --git a/phpBB/phpbb/template/asset.php b/phpBB/phpbb/template/asset.php
index ff9366af4a..cb00f16549 100644
--- a/phpBB/phpbb/template/asset.php
+++ b/phpBB/phpbb/template/asset.php
@@ -20,15 +20,20 @@ class asset
 	/** @var \phpbb\path_helper **/
 	protected $path_helper;
 
+	/** @var \phpbb\filesystem\filesystem */
+	protected $filesystem;
+
 	/**
 	* Constructor
 	*
 	* @param string $url URL
 	* @param \phpbb\path_helper $path_helper Path helper object
+	* @param \phpbb\filesystem\filesystem $filesystem
 	*/
-	public function __construct($url, \phpbb\path_helper $path_helper)
+	public function __construct($url, \phpbb\path_helper $path_helper, \phpbb\filesystem\filesystem $filesystem)
 	{
 		$this->path_helper = $path_helper;
+		$this->filesystem = $filesystem;
 
 		$this->set_url($url);
 	}
@@ -152,18 +157,18 @@ class asset
 	*/
 	public function set_path($path, $urlencode = false)
 	{
-		// Since 1.7.0 Twig returns the real path of the file. We need it to be relative to the working directory.
-		$real_root_path = realpath($this->path_helper->get_phpbb_root_path()) . DIRECTORY_SEPARATOR;
+		// Since 1.7.0 Twig returns the real path of the file. We need it to be relative.
+		$real_root_path = $this->filesystem->realpath($this->path_helper->get_phpbb_root_path()) . DIRECTORY_SEPARATOR;
 
 		// If the asset is under the phpBB root path we need to remove its path and then prepend $phpbb_root_path
-		if (substr($path . DIRECTORY_SEPARATOR, 0, strlen($real_root_path)) === $real_root_path)
+		if ($real_root_path && substr($path . DIRECTORY_SEPARATOR, 0, strlen($real_root_path)) === $real_root_path)
 		{
 			$path = $this->path_helper->get_phpbb_root_path() . str_replace('\\', '/', substr($path, strlen($real_root_path)));
 		}
 		else
 		{
 			// Else we make the path relative to the current working directory
-			$real_root_path = realpath('.') . DIRECTORY_SEPARATOR;
+			$real_root_path = $this->filesystem->realpath('.') . DIRECTORY_SEPARATOR;
 			if ($real_root_path && substr($path . DIRECTORY_SEPARATOR, 0, strlen($real_root_path)) === $real_root_path)
 			{
 				$path = str_replace('\\', '/', substr($path, strlen($real_root_path)));
diff --git a/phpBB/phpbb/template/assets_bag.php b/phpBB/phpbb/template/assets_bag.php
new file mode 100644
index 0000000000..9013061b96
--- /dev/null
+++ b/phpBB/phpbb/template/assets_bag.php
@@ -0,0 +1,95 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template;
+
+class assets_bag
+{
+	/** @var asset[] */
+	protected $stylesheets = [];
+
+	/** @var asset[] */
+	protected $scripts = [];
+
+	/**
+	 * Add a css asset to the bag
+	 *
+	 * @param asset $asset
+	 */
+	public function add_stylesheet(asset $asset)
+	{
+		$this->stylesheets[] = $asset;
+	}
+
+	/**
+	 * Add a js script asset to the bag
+	 *
+	 * @param asset $asset
+	 */
+	public function add_script(asset $asset)
+	{
+		$this->scripts[] = $asset;
+	}
+
+	/**
+	 * Returns all css assets
+	 *
+	 * @return asset[]
+	 */
+	public function get_stylesheets()
+	{
+		return $this->stylesheets;
+	}
+
+	/**
+	 * Returns all js assets
+	 *
+	 * @return asset[]
+	 */
+	public function get_scripts()
+	{
+		return $this->scripts;
+	}
+
+	/**
+	 * Returns the HTML code to includes all css assets
+	 *
+	 * @return string
+	 */
+	public function get_stylesheets_content()
+	{
+		$output = '';
+		foreach ($this->stylesheets as $stylesheet)
+		{
+			$output .= "<link href=\"{$stylesheet->get_url()}\" rel=\"stylesheet\" type=\"text/css\" media=\"screen\" />\n";
+		}
+
+		return $output;
+	}
+
+	/**
+	 * Returns the HTML code to includes all js assets
+	 *
+	 * @return string
+	 */
+	public function get_scripts_content()
+	{
+		$output = '';
+		foreach ($this->scripts as $script)
+		{
+			$output .= "<script type=\"text/javascript\" src=\"{$script->get_url()}\"></script>\n";
+		}
+
+		return $output;
+	}
+}
diff --git a/phpBB/phpbb/template/exception/user_object_not_available.php b/phpBB/phpbb/template/exception/user_object_not_available.php
new file mode 100644
index 0000000000..62fd2743c1
--- /dev/null
+++ b/phpBB/phpbb/template/exception/user_object_not_available.php
@@ -0,0 +1,22 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\template\exception;
+
+/**
+ * This exception is thrown when the user object was not set but it is required by the called method
+ */
+class user_object_not_available extends \phpbb\exception\runtime_exception
+{
+
+}
diff --git a/phpBB/phpbb/template/twig/environment.php b/phpBB/phpbb/template/twig/environment.php
index 476ffd935e..179412a2e3 100644
--- a/phpBB/phpbb/template/twig/environment.php
+++ b/phpBB/phpbb/template/twig/environment.php
@@ -13,14 +13,22 @@
 
 namespace phpbb\template\twig;
 
+use phpbb\template\assets_bag;
+
 class environment extends \Twig_Environment
 {
 	/** @var \phpbb\config\config */
 	protected $phpbb_config;
 
+	/** @var \phpbb\filesystem\filesystem */
+	protected $filesystem;
+
 	/** @var \phpbb\path_helper */
 	protected $phpbb_path_helper;
 
+	/** @var \Symfony\Component\DependencyInjection\ContainerInterface */
+	protected $container;
+
 	/** @var \phpbb\extension\manager */
 	protected $extension_manager;
 
@@ -33,26 +41,41 @@ class environment extends \Twig_Environment
 	/** @var array **/
 	protected $namespace_look_up_order = array('__main__');
 
+	/** @var assets_bag */
+	protected $assets_bag;
+
 	/**
 	* Constructor
 	*
 	* @param \phpbb\config\config $phpbb_config The phpBB configuration
+	* @param \phpbb\filesystem\filesystem $filesystem
 	* @param \phpbb\path_helper $path_helper phpBB path helper
+	* @param string $cache_path The path to the cache directory
 	* @param \phpbb\extension\manager $extension_manager phpBB extension manager
 	* @param \Twig_LoaderInterface $loader Twig loader interface
 	* @param array $options Array of options to pass to Twig
 	*/
-	public function __construct($phpbb_config, \phpbb\path_helper $path_helper, \phpbb\extension\manager $extension_manager = null, \Twig_LoaderInterface $loader = null, $options = array())
+	public function __construct(\phpbb\config\config $phpbb_config, \phpbb\filesystem\filesystem $filesystem, \phpbb\path_helper $path_helper, $cache_path, \phpbb\extension\manager $extension_manager = null, \Twig_LoaderInterface $loader = null, $options = array())
 	{
 		$this->phpbb_config = $phpbb_config;
 
+		$this->filesystem = $filesystem;
 		$this->phpbb_path_helper = $path_helper;
 		$this->extension_manager = $extension_manager;
 
 		$this->phpbb_root_path = $this->phpbb_path_helper->get_phpbb_root_path();
 		$this->web_root_path = $this->phpbb_path_helper->get_web_root_path();
 
-		return parent::__construct($loader, $options);
+		$this->assets_bag = new assets_bag();
+
+		$options = array_merge(array(
+			'cache'			=> (defined('IN_INSTALL')) ? false : $cache_path,
+			'debug'			=> false,
+			'auto_reload'	=> (bool) $this->phpbb_config['load_tplcompile'],
+			'autoescape'	=> false,
+		), $options);
+
+		parent::__construct($loader, $options);
 	}
 
 	/**
@@ -78,16 +101,26 @@ class environment extends \Twig_Environment
 	}
 
 	/**
-	* Get the phpBB root path
-	*
-	* @return string
-	*/
+	 * Get the phpBB root path
+	 *
+	 * @return string
+	 */
 	public function get_phpbb_root_path()
 	{
 		return $this->phpbb_root_path;
 	}
 
 	/**
+	* Get the filesystem object
+	*
+	* @return \phpbb\filesystem\filesystem
+	*/
+	public function get_filesystem()
+	{
+		return $this->filesystem;
+	}
+
+	/**
 	* Get the web root path
 	*
 	* @return string
@@ -108,6 +141,16 @@ class environment extends \Twig_Environment
 	}
 
 	/**
+	 * Gets the assets bag
+	 *
+	 * @return assets_bag
+	 */
+	public function get_assets_bag()
+	{
+		return $this->assets_bag;
+	}
+
+	/**
 	* Get the namespace look up order
 	*
 	* @return array
@@ -131,6 +174,55 @@ class environment extends \Twig_Environment
 	}
 
 	/**
+	 * {@inheritdoc}
+	 */
+	public function render($name, array $context = [])
+	{
+		return $this->display_with_assets($name, $context);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function display($name, array $context = [])
+	{
+		echo $this->display_with_assets($name, $context);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	private function display_with_assets($name, array $context = [])
+	{
+		$placeholder_salt = unique_id();
+
+		if (array_key_exists('definition', $context))
+		{
+			$context['definition']->set('SCRIPTS', '__SCRIPTS_' . $placeholder_salt . '__');
+			$context['definition']->set('STYLESHEETS', '__STYLESHEETS_' . $placeholder_salt . '__');
+		}
+
+		$output = parent::render($name, $context);
+
+		return $this->inject_assets($output, $placeholder_salt);
+	}
+
+	/**
+	 * Injects the assets (from INCLUDECSS/JS) in the output.
+	 *
+	 * @param string $output
+	 *
+	 * @return string
+	 */
+	private function inject_assets($output, $placeholder_salt)
+	{
+		$output = str_replace('__STYLESHEETS_' . $placeholder_salt . '__', $this->assets_bag->get_stylesheets_content(), $output);
+		$output = str_replace('__SCRIPTS_' . $placeholder_salt . '__', $this->assets_bag->get_scripts_content(), $output);
+
+		return $output;
+	}
+
+	/**
 	* Loads a template by name.
 	*
 	* @param string  $name  The template name
diff --git a/phpBB/phpbb/template/twig/extension.php b/phpBB/phpbb/template/twig/extension.php
index 3a983491b9..92f87a0331 100644
--- a/phpBB/phpbb/template/twig/extension.php
+++ b/phpBB/phpbb/template/twig/extension.php
@@ -18,20 +18,20 @@ class extension extends \Twig_Extension
 	/** @var \phpbb\template\context */
 	protected $context;
 
-	/** @var \phpbb\user */
-	protected $user;
+	/** @var \phpbb\language\language */
+	protected $language;
 
 	/**
 	* Constructor
 	*
 	* @param \phpbb\template\context $context
-	* @param \phpbb\user $user
+	* @param \phpbb\language\language $language
 	* @return \phpbb\template\twig\extension
 	*/
-	public function __construct(\phpbb\template\context $context, $user)
+	public function __construct(\phpbb\template\context $context, $language)
 	{
 		$this->context = $context;
-		$this->user = $user;
+		$this->language = $language;
 	}
 
 	/**
@@ -71,6 +71,7 @@ class extension extends \Twig_Extension
 	{
 		return array(
 			new \Twig_SimpleFilter('subset', array($this, 'loop_subset'), array('needs_environment' => true)),
+			// @deprecated 3.2.0 Uses twig's JS escape method instead of addslashes
 			new \Twig_SimpleFilter('addslashes', 'addslashes'),
 		);
 	}
@@ -177,9 +178,9 @@ class extension extends \Twig_Extension
 			return $context_vars['L_' . $key];
 		}
 
-		// LA_ is transformed into lang(\'$1\')|addslashes, so we should not
+		// LA_ is transformed into lang(\'$1\')|escape('js'), so we should not
 		// need to check for it
 
-		return call_user_func_array(array($this->user, 'lang'), $args);
+		return call_user_func_array(array($this->language, 'lang'), $args);
 	}
 }
diff --git a/phpBB/phpbb/template/twig/extension/routing.php b/phpBB/phpbb/template/twig/extension/routing.php
new file mode 100644
index 0000000000..829ce738eb
--- /dev/null
+++ b/phpBB/phpbb/template/twig/extension/routing.php
@@ -0,0 +1,43 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\extension;
+
+use Symfony\Bridge\Twig\Extension\RoutingExtension;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+class routing extends RoutingExtension
+{
+	/** @var \phpbb\controller\helper */
+	protected $helper;
+
+	/**
+	* Constructor
+	*
+	* @param \phpbb\routing\helper $helper
+	*/
+	public function __construct(\phpbb\routing\helper $helper)
+	{
+		$this->helper = $helper;
+	}
+
+	public function getPath($name, $parameters = array(), $relative = false)
+	{
+		return $this->helper->route($name, $parameters, true, false, $relative ? UrlGeneratorInterface::RELATIVE_PATH : UrlGeneratorInterface::ABSOLUTE_PATH);
+	}
+
+	public function getUrl($name, $parameters = array(), $schemeRelative = false)
+	{
+		return $this->helper->route($name, $parameters, true, false, $schemeRelative ? UrlGeneratorInterface::NETWORK_PATH : UrlGeneratorInterface::ABSOLUTE_URL);
+	}
+}
diff --git a/phpBB/phpbb/template/twig/lexer.php b/phpBB/phpbb/template/twig/lexer.php
index c5dc7273ba..f1542109a4 100644
--- a/phpBB/phpbb/template/twig/lexer.php
+++ b/phpBB/phpbb/template/twig/lexer.php
@@ -15,6 +15,11 @@ namespace phpbb\template\twig;
 
 class lexer extends \Twig_Lexer
 {
+	public function set_environment(\Twig_Environment $env)
+	{
+		$this->env = $env;
+	}
+
 	public function tokenize($code, $filename = null)
 	{
 		// Our phpBB tags
@@ -112,9 +117,9 @@ class lexer extends \Twig_Lexer
 		// Appends any filters after lang()
 		$code = preg_replace('#{L_([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ lang(\'$1\')$2 }}', $code);
 
-		// Replace all of our escaped language variables, {LA_VARNAME}, with Twig style, {{ lang('NAME')|addslashes }}
-		// Appends any filters after lang(), but before addslashes
-		$code = preg_replace('#{LA_([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ lang(\'$1\')$2|addslashes }}', $code);
+		// Replace all of our escaped language variables, {LA_VARNAME}, with Twig style, {{ lang('NAME')|escape('js') }}
+		// Appends any filters after lang(), but before escape('js')
+		$code = preg_replace('#{LA_([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ lang(\'$1\')$2|escape(\'js\') }}', $code);
 
 		// Replace all of our variables, {VARNAME}, with Twig style, {{ VARNAME }}
 		// Appends any filters
diff --git a/phpBB/phpbb/template/twig/loader.php b/phpBB/phpbb/template/twig/loader.php
index 139a413b70..8b12188a77 100644
--- a/phpBB/phpbb/template/twig/loader.php
+++ b/phpBB/phpbb/template/twig/loader.php
@@ -21,6 +21,24 @@ class loader extends \Twig_Loader_Filesystem
 	protected $safe_directories = array();
 
 	/**
+	 * @var \phpbb\filesystem\filesystem_interface
+	 */
+	protected $filesystem;
+
+	/**
+	 * Constructor
+	 *
+	 * @param \phpbb\filesystem\filesystem_interface $filesystem
+	 * @param string|array	$paths
+	 */
+	public function __construct(\phpbb\filesystem\filesystem_interface $filesystem, $paths = array())
+	{
+		$this->filesystem = $filesystem;
+
+		parent::__construct($paths);
+	}
+
+	/**
 	* Set safe directories
 	*
 	* @param array $directories Array of directories that are safe (empty to clear)
@@ -49,7 +67,7 @@ class loader extends \Twig_Loader_Filesystem
 	*/
 	public function addSafeDirectory($directory)
 	{
-		$directory = phpbb_realpath($directory);
+		$directory = $this->filesystem->realpath($directory);
 
 		if ($directory !== false)
 		{
@@ -119,7 +137,7 @@ class loader extends \Twig_Loader_Filesystem
 				//	can now check if we're within a "safe" directory
 
 				// Find the real path of the directory the file is in
-				$directory = phpbb_realpath(dirname($file));
+				$directory = $this->filesystem->realpath(dirname($file));
 
 				if ($directory === false)
 				{
diff --git a/phpBB/phpbb/template/twig/node/event.php b/phpBB/phpbb/template/twig/node/event.php
index b765bde98d..11fdb75247 100644
--- a/phpBB/phpbb/template/twig/node/event.php
+++ b/phpBB/phpbb/template/twig/node/event.php
@@ -46,7 +46,7 @@ class event extends \Twig_Node
 		{
 			$ext_namespace = str_replace('/', '_', $ext_namespace);
 
-			if (defined('DEBUG'))
+			if ($this->environment->isDebug())
 			{
 				// If debug mode is enabled, lets check for new/removed EVENT
 				//  templates on page load rather than at compile. This is
@@ -58,7 +58,7 @@ class event extends \Twig_Node
 				;
 			}
 
-			if (defined('DEBUG') || $this->environment->getLoader()->exists('@' . $ext_namespace . '/' . $location . '.html'))
+			if ($this->environment->isDebug() || $this->environment->getLoader()->exists('@' . $ext_namespace . '/' . $location . '.html'))
 			{
 				$compiler
 					->write("\$previous_look_up_order = \$this->env->getNamespaceLookUpOrder();\n")
@@ -70,7 +70,7 @@ class event extends \Twig_Node
 				;
 			}
 
-			if (defined('DEBUG'))
+			if ($this->environment->isDebug())
 			{
 				$compiler
 					->outdent()
diff --git a/phpBB/phpbb/template/twig/node/includeasset.php b/phpBB/phpbb/template/twig/node/includeasset.php
index 15195a226b..6d50eafc9d 100644
--- a/phpBB/phpbb/template/twig/node/includeasset.php
+++ b/phpBB/phpbb/template/twig/node/includeasset.php
@@ -39,7 +39,7 @@ abstract class includeasset extends \Twig_Node
 			->write("\$asset_file = ")
 			->subcompile($this->getNode('expr'))
 			->raw(";\n")
-			->write("\$asset = new \phpbb\\template\\asset(\$asset_file, \$this->getEnvironment()->get_path_helper());\n")
+			->write("\$asset = new \phpbb\\template\\asset(\$asset_file, \$this->getEnvironment()->get_path_helper(), \$this->getEnvironment()->get_filesystem());\n")
 			->write("if (substr(\$asset_file, 0, 2) !== './' && \$asset->is_relative()) {\n")
 			->indent()
 				->write("\$asset_path = \$asset->get_path();")
@@ -49,33 +49,18 @@ abstract class includeasset extends \Twig_Node
 					->write("\$local_file = \$this->getEnvironment()->findTemplate(\$asset_path);\n")
 					->write("\$asset->set_path(\$local_file, true);\n")
 				->outdent()
-				->write("\$asset->add_assets_version('{$config['assets_version']}');\n")
-				->write("\$asset_file = \$asset->get_url();\n")
 				->write("}\n")
+				->write("\$asset->add_assets_version('{$config['assets_version']}');\n")
 			->outdent()
 			->write("}\n")
-			->write("\$context['definition']->append('{$this->get_definition_name()}', '")
-		;
-
-		$this->append_asset($compiler);
-
-		$compiler
-			->raw("\n');\n")
+			->write("\$this->getEnvironment()->get_assets_bag()->add_{$this->get_setters_name()}(\$asset);")
 		;
 	}
 
 	/**
-	* Get the definition name
+	* Get the name of the assets bag setter
 	*
-	* @return string (e.g. 'SCRIPTS')
-	*/
-	abstract public function get_definition_name();
-
-	/**
-	* Append the output code for the asset
-	*
-	* @param \Twig_Compiler A Twig_Compiler instance
-	* @return null
+	* @return string (e.g. 'script')
 	*/
-	abstract protected function append_asset(\Twig_Compiler $compiler);
+	abstract public function get_setters_name();
 }
diff --git a/phpBB/phpbb/template/twig/node/includecss.php b/phpBB/phpbb/template/twig/node/includecss.php
index 2dac154036..2e97d4972d 100644
--- a/phpBB/phpbb/template/twig/node/includecss.php
+++ b/phpBB/phpbb/template/twig/node/includecss.php
@@ -18,20 +18,8 @@ class includecss extends \phpbb\template\twig\node\includeasset
 	/**
 	* {@inheritdoc}
 	*/
-	public function get_definition_name()
+	public function get_setters_name()
 	{
-		return 'STYLESHEETS';
-	}
-
-	/**
-	* {@inheritdoc}
-	*/
-	public function append_asset(\Twig_Compiler $compiler)
-	{
-		$compiler
-			->raw("<link href=\"' . ")
-			->raw("\$asset_file . '\"")
-			->raw(' rel="stylesheet" type="text/css" media="screen" />')
-		;
+		return 'stylesheet';
 	}
 }
diff --git a/phpBB/phpbb/template/twig/node/includejs.php b/phpBB/phpbb/template/twig/node/includejs.php
index 0f67f9ff60..505b49757b 100644
--- a/phpBB/phpbb/template/twig/node/includejs.php
+++ b/phpBB/phpbb/template/twig/node/includejs.php
@@ -18,22 +18,8 @@ class includejs extends \phpbb\template\twig\node\includeasset
 	/**
 	* {@inheritdoc}
 	*/
-	public function get_definition_name()
+	public function get_setters_name()
 	{
-		return 'SCRIPTS';
-	}
-
-	/**
-	* {@inheritdoc}
-	*/
-	protected function append_asset(\Twig_Compiler $compiler)
-	{
-		$config = $this->environment->get_phpbb_config();
-
-		$compiler
-			->raw("<script type=\"text/javascript\" src=\"' . ")
-			->raw("\$asset_file")
-			->raw(". '\"></script>\n")
-		;
+		return 'script';
 	}
 }
diff --git a/phpBB/phpbb/template/twig/twig.php b/phpBB/phpbb/template/twig/twig.php
index d1bbb2b55a..f322778eda 100644
--- a/phpBB/phpbb/template/twig/twig.php
+++ b/phpBB/phpbb/template/twig/twig.php
@@ -13,6 +13,8 @@
 
 namespace phpbb\template\twig;
 
+use phpbb\template\exception\user_object_not_available;
+
 /**
 * Twig Template class.
 */
@@ -76,11 +78,14 @@ class twig extends \phpbb\template\base
 	*
 	* @param \phpbb\path_helper $path_helper
 	* @param \phpbb\config\config $config
-	* @param \phpbb\user $user
 	* @param \phpbb\template\context $context template context
+	* @param \phpbb\template\twig\environment $twig_environment
+	* @param string $cache_path
+	* @param \phpbb\user|null $user
+	* @param array|\ArrayAccess $extensions
 	* @param \phpbb\extension\manager $extension_manager extension manager, if null then template events will not be invoked
 	*/
-	public function __construct(\phpbb\path_helper $path_helper, $config, $user, \phpbb\template\context $context, \phpbb\extension\manager $extension_manager = null)
+	public function __construct(\phpbb\path_helper $path_helper, $config, \phpbb\template\context $context, \phpbb\template\twig\environment $twig_environment, $cache_path, \phpbb\user $user = null, $extensions = array(), \phpbb\extension\manager $extension_manager = null)
 	{
 		$this->path_helper = $path_helper;
 		$this->phpbb_root_path = $path_helper->get_phpbb_root_path();
@@ -89,41 +94,14 @@ class twig extends \phpbb\template\base
 		$this->user = $user;
 		$this->context = $context;
 		$this->extension_manager = $extension_manager;
+		$this->cachepath = $cache_path;
+		$this->twig = $twig_environment;
 
-		$this->cachepath = $this->phpbb_root_path . 'cache/twig/';
-
-		// Initiate the loader, __main__ namespace paths will be setup later in set_style_names()
-		$loader = new \phpbb\template\twig\loader('');
-
-		$this->twig = new \phpbb\template\twig\environment(
-			$this->config,
-			$this->path_helper,
-			$this->extension_manager,
-			$loader,
-			array(
-				'cache'			=> (defined('IN_INSTALL')) ? false : $this->cachepath,
-				'debug'			=> defined('DEBUG'),
-				'auto_reload'	=> (bool) $this->config['load_tplcompile'],
-				'autoescape'	=> false,
-			)
-		);
-
-		$this->twig->addExtension(
-			new \phpbb\template\twig\extension(
-				$this->context,
-				$this->user
-			)
-		);
-
-		if (defined('DEBUG'))
+		foreach ($extensions as $extension)
 		{
-			$this->twig->addExtension(new \Twig_Extension_Debug());
+			$this->twig->addExtension($extension);
 		}
 
-		$lexer = new \phpbb\template\twig\lexer($this->twig);
-
-		$this->twig->setLexer($lexer);
-
 		// Add admin namespace
 		if ($this->path_helper->get_adm_relative_path() !== null && is_dir($this->phpbb_root_path . $this->path_helper->get_adm_relative_path() . 'style/'))
 		{
@@ -150,9 +128,16 @@ class twig extends \phpbb\template\base
 	* Get the style tree of the style preferred by the current user
 	*
 	* @return array Style tree, most specific first
+	*
+	* @throws \phpbb\template\exception\user_object_not_available	When user service was not set
 	*/
 	public function get_user_style()
 	{
+		if ($this->user === null)
+		{
+			throw new user_object_not_available();
+		}
+
 		$style_list = array(
 			$this->user->style['style_path'],
 		);
@@ -368,14 +353,24 @@ class twig extends \phpbb\template\base
 			$context_vars['.'][0], // To get normal vars
 			array(
 				'definition'	=> new \phpbb\template\twig\definition(),
-				'user'			=> $this->user,
 				'loops'			=> $context_vars, // To get loops
 			)
 		);
 
+		if ($this->user instanceof \phpbb\user)
+		{
+			$vars['user'] = $this->user;
+		}
+
 		// cleanup
 		unset($vars['loops']['.']);
 
+		// Inject in the main context the value added by assign_block_vars() to be able to use directly the Twig loops.
+		foreach ($vars['loops'] as $key => &$value)
+		{
+			$vars[$key] = $value;
+		}
+
 		return $vars;
 	}