9 files changed, 331 insertions, 0 deletions
diff --git a/src/Renderer/RendererServiceProvider.php b/src/Renderer/RendererServiceProvider.php
index 3e8d69bc..2e41837b 100644
--- a/src/Renderer/RendererServiceProvider.php
+++ b/src/Renderer/RendererServiceProvider.php
@@ -24,12 +24,14 @@ class RendererServiceProvider extends ServiceProvider
     protected function registerRenderer()
     {
         $renderer = $this->app->make(Renderer::class);
+        $this->app->instance(Renderer::class, $renderer);
         $this->app->instance('renderer', $renderer);
     }
 
     protected function registerHtmlEngine()
     {
         $htmlEngine = $this->app->make(HtmlEngine::class);
+        $this->app->instance(HtmlEngine::class, $htmlEngine);
         $this->app->instance('renderer.htmlEngine', $htmlEngine);
         $this->app->tag('renderer.htmlEngine', ['renderer.engine']);
     }
diff --git a/src/Renderer/Twig/Extensions/Config.php b/src/Renderer/Twig/Extensions/Config.php
new file mode 100644
index 00000000..dbbe93e7
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Config.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Engelsystem\Config\Config as EngelsystemConfig;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Config extends TwigExtension
+{
+    /** @var EngelsystemConfig */
+    protected $config;
+
+    /**
+     * @param EngelsystemConfig $config
+     */
+    public function __construct(EngelsystemConfig $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('config', [$this->config, 'get']),
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Globals.php b/src/Renderer/Twig/Extensions/Globals.php
new file mode 100644
index 00000000..f9bffbc8
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Globals.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Twig_Extension as TwigExtension;
+use Twig_Extension_GlobalsInterface as GlobalsInterface;
+
+class Globals extends TwigExtension implements GlobalsInterface
+{
+    /**
+     * Returns a list of global variables to add to the existing list.
+     *
+     * @return array An array of global variables
+     */
+    public function getGlobals()
+    {
+        global $user;
+
+        return [
+            'user' => isset($user) ? $user : [],
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Session.php b/src/Renderer/Twig/Extensions/Session.php
new file mode 100644
index 00000000..4690f701
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Session.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Symfony\Component\HttpFoundation\Session\Session as SymfonySession;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Session extends TwigExtension
+{
+    /** @var SymfonySession */
+    protected $session;
+
+    /**
+     * @param SymfonySession $session
+     */
+    public function __construct(SymfonySession $session)
+    {
+        $this->session = $session;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('session_get', [$this->session, 'get']),
+        ];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Translation.php b/src/Renderer/Twig/Extensions/Translation.php
new file mode 100644
index 00000000..63f9800e
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Translation.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Engelsystem\Helpers\Translator;
+use Twig_Extension as TwigExtension;
+use Twig_Extensions_TokenParser_Trans as TranslationTokenParser;
+use Twig_Filter as TwigFilter;
+use Twig_Function as TwigFunction;
+use Twig_TokenParserInterface as TwigTokenParser;
+
+class Translation extends TwigExtension
+{
+    /** @var Translator */
+    protected $translator;
+
+    /** @var TranslationTokenParser */
+    protected $tokenParser;
+
+    /**
+     * @param Translator             $translator
+     * @param TranslationTokenParser $tokenParser
+     */
+    public function __construct(Translator $translator, TranslationTokenParser $tokenParser)
+    {
+        $this->translator = $translator;
+        $this->tokenParser = $tokenParser;
+    }
+
+    /**
+     * @return array
+     */
+    public function getFilters()
+    {
+        return [
+            new TwigFilter('trans', [$this->translator, 'translate']),
+        ];
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('__', [$this->translator, 'translate']),
+        ];
+    }
+
+    /**
+     * @return TwigTokenParser[]
+     */
+    public function getTokenParsers()
+    {
+        return [$this->tokenParser];
+    }
+}
diff --git a/src/Renderer/Twig/Extensions/Url.php b/src/Renderer/Twig/Extensions/Url.php
new file mode 100644
index 00000000..62e59782
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Url.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Engelsystem\Http\UrlGenerator;
+use Twig_Extension as TwigExtension;
+use Twig_Function as TwigFunction;
+
+class Url extends TwigExtension
+{
+    /** @var UrlGenerator */
+    protected $urlGenerator;
+
+    /**
+     * @param UrlGenerator $urlGenerator
+     */
+    public function __construct(UrlGenerator $urlGenerator)
+    {
+        $this->urlGenerator = $urlGenerator;
+    }
+
+    /**
+     * @return TwigFunction[]
+     */
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('url', [$this, 'getUrl']),
+        ];
+    }
+
+    /**
+     * @param string $path
+     * @param array  $parameters
+     * @return UrlGenerator|string
+     */
+    public function getUrl($path, $parameters = [])
+    {
+        $path = str_replace('_', '-', $path);
+
+        return $this->urlGenerator->to($path, $parameters);
+    }
+}
diff --git a/src/Renderer/TwigEngine.php b/src/Renderer/TwigEngine.php
new file mode 100644
index 00000000..55a2e299
--- /dev/null
+++ b/src/Renderer/TwigEngine.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Engelsystem\Renderer;
+
+use Twig_Environment as Twig;
+use Twig_Error_Loader as LoaderError;
+use Twig_Error_Runtime as RuntimeError;
+use Twig_Error_Syntax as SyntaxError;
+
+class TwigEngine implements EngineInterface
+{
+    /** @var Twig */
+    protected $twig;
+
+    public function __construct(Twig $twig)
+    {
+        $this->twig = $twig;
+    }
+
+    /**
+     * Render a twig template
+     *
+     * @param string $path
+     * @param array  $data
+     * @return string
+     * @throws LoaderError|RuntimeError|SyntaxError
+     */
+    public function get($path, $data = [])
+    {
+        return $this->twig->render($path, $data);
+    }
+
+    /**
+     * @param string $path
+     * @return bool
+     */
+    public function canRender($path)
+    {
+        return $this->twig->getLoader()->exists($path);
+    }
+}
diff --git a/src/Renderer/TwigLoader.php b/src/Renderer/TwigLoader.php
new file mode 100644
index 00000000..154e6dbb
--- /dev/null
+++ b/src/Renderer/TwigLoader.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Engelsystem\Renderer;
+
+use Twig_Error_Loader;
+use Twig_Loader_Filesystem as FilesystemLoader;
+
+class TwigLoader extends FilesystemLoader
+{
+    /**
+     * @param string $name
+     * @param bool   $throw
+     * @return false|string
+     * @throws Twig_Error_Loader
+     */
+    public function findTemplate($name, $throw = true)
+    {
+        $extension = '.twig';
+        $extensionLength = strlen($extension);
+        if (substr($name, -$extensionLength, $extensionLength) !== $extension) {
+            $name .= $extension;
+        }
+
+        return parent::findTemplate($name, $throw);
+    }
+}
diff --git a/src/Renderer/TwigServiceProvider.php b/src/Renderer/TwigServiceProvider.php
new file mode 100644
index 00000000..0f453989
--- /dev/null
+++ b/src/Renderer/TwigServiceProvider.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Engelsystem\Renderer;
+
+use Engelsystem\Container\ServiceProvider;
+use Engelsystem\Renderer\Twig\Extensions\Config;
+use Engelsystem\Renderer\Twig\Extensions\Globals;
+use Engelsystem\Renderer\Twig\Extensions\Session;
+use Engelsystem\Renderer\Twig\Extensions\Translation;
+use Engelsystem\Renderer\Twig\Extensions\Url;
+use Twig_Environment as Twig;
+use Twig_LoaderInterface as TwigLoaderInterface;
+
+class TwigServiceProvider extends ServiceProvider
+{
+    /** @var array */
+    protected $extensions = [
+        'config'      => Config::class,
+        'globals'     => Globals::class,
+        'session'     => Session::class,
+        'url'         => Url::class,
+        'translation' => Translation::class,
+    ];
+
+    public function register()
+    {
+        $this->registerTwigEngine();
+
+        foreach ($this->extensions as $alias => $class) {
+            $this->registerTwigExtensions($class, $alias);
+        }
+    }
+
+    public function boot()
+    {
+        /** @var Twig $renderer */
+        $renderer = $this->app->get('twig.environment');
+
+        foreach ($this->app->tagged('twig.extension') as $extension) {
+            $renderer->addExtension($extension);
+        }
+    }
+
+    protected function registerTwigEngine()
+    {
+        $viewsPath = $this->app->get('path.views');
+
+        $twigLoader = $this->app->make(TwigLoader::class, ['paths' => $viewsPath]);
+        $this->app->instance(TwigLoader::class, $twigLoader);
+        $this->app->instance(TwigLoaderInterface::class, $twigLoader);
+        $this->app->instance('twig.loader', $twigLoader);
+
+        $twig = $this->app->make(Twig::class);
+        $this->app->instance(Twig::class, $twig);
+        $this->app->instance('twig.environment', $twig);
+
+        $twigEngine = $this->app->make(TwigEngine::class);
+        $this->app->instance('renderer.twigEngine', $twigEngine);
+        $this->app->tag('renderer.twigEngine', ['renderer.engine']);
+    }
+
+    /**
+     * @param string $class
+     * @param string $alias
+     */
+    protected function registerTwigExtensions($class, $alias)
+    {
+        $alias = 'twig.extension.' . $alias;
+
+        $extension = $this->app->make($class);
+
+        $this->app->instance($class, $extension);
+        $this->app->instance($alias, $extension);
+
+        $this->app->tag($alias, ['twig.extension']);
+    }
+}