[TwigBundle] added the Twig bundle (proof of concept)

src/Symfony/Framework/TwigBundle/Bundle.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle;
+
+use Symfony\Foundation\Bundle\Bundle as BaseBundle;
+use Symfony\Components\DependencyInjection\ContainerInterface;
+use Symfony\Components\DependencyInjection\Loader\Loader;
+use Symfony\Components\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Components\DependencyInjection\BuilderConfiguration;
+use Symfony\Framework\TwigBundle\DependencyInjection\TwigExtension;
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Bundle.
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Bundle extends BaseBundle
+{
+    /**
+     * Customizes the Container instance.
+     *
+     * @param Symfony\Components\DependencyInjection\ContainerInterface $container A ContainerInterface instance
+     *
+     * @return Symfony\Components\DependencyInjection\BuilderConfiguration A BuilderConfiguration instance
+     */
+    public function buildContainer(ContainerInterface $container)
+    {
+        Loader::registerExtension(new TwigExtension());
+    }
+}

src/Symfony/Framework/TwigBundle/DependencyInjection/TwigExtension.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle\DependencyInjection;
+
+use Symfony\Components\DependencyInjection\Loader\LoaderExtension;
+use Symfony\Components\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Components\DependencyInjection\BuilderConfiguration;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * TwigExtension.
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class TwigExtension extends LoaderExtension
+{
+    public function configLoad($config)
+    {
+        $configuration = new BuilderConfiguration();
+
+        $loader = new XmlFileLoader(__DIR__.'/../Resources/config');
+        $configuration->merge($loader->load('twig.xml'));
+
+        $configuration->setParameter('twig_options', array_replace($configuration->getParameter('twig_options'), $config));
+
+        return $configuration;
+    }
+
+    /**
+     * Returns the base path for the XSD files.
+     *
+     * @return string The XSD base path
+     */
+    public function getXsdValidationBasePath()
+    {
+        return __DIR__.'/../Resources/config/';
+    }
+
+    public function getNamespace()
+    {
+        return 'http://www.symfony-project.org/schema/dic/twig';
+    }
+
+    public function getAlias()
+    {
+        return 'twig';
+    }
+}

src/Symfony/Framework/TwigBundle/Environment.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle;
+
+use Symfony\Components\DependencyInjection\ContainerInterface;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * TwigExtension.
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Environment extends \Twig_Environment
+{
+    public function __construct(ContainerInterface $container, \Twig_LoaderInterface $loader = null, $options = array())
+    {
+        parent::__construct($loader, $options);
+
+        foreach ($container->findAnnotatedServiceIds('twig.extension') as $id => $attributes) {
+            $this->addExtension($container->getService($id));
+        }
+    }
+}

src/Symfony/Framework/TwigBundle/Extension/Helpers.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle\Extension;
+
+use Symfony\Components\Templating\Engine;
+use Symfony\Framework\TwigBundle\TokenParser\StylesheetTokenParser;
+use Symfony\Framework\TwigBundle\TokenParser\StylesheetsTokenParser;
+use Symfony\Framework\TwigBundle\TokenParser\RouteTokenParser;
+use Symfony\Framework\TwigBundle\TokenParser\RenderTokenParser;
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Helpers extends \Twig_Extension
+{
+    /**
+     * Returns the token parser instance to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParser instances
+     */
+    public function getTokenParsers()
+    {
+        return array(
+            new StylesheetTokenParser(),
+            new StylesheetsTokenParser(),
+            new RouteTokenParser(),
+            new RenderTokenParser(),
+        );
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'symfony.helpers';
+    }
+}

src/Symfony/Framework/TwigBundle/Loader/Loader.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle\Loader;
+
+use Symfony\Components\Templating\Engine;
+use Symfony\Components\Templating\Storage\Storage;
+use Symfony\Components\Templating\Storage\FileStorage;
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Loader implements \Twig_LoaderInterface
+{
+    protected $engine;
+
+    public function setEngine(Engine $engine)
+    {
+        $this->engine = $engine;
+    }
+
+    /**
+     * Gets the source code of a template, given its name.
+     *
+     * @param  string $name string The name of the template to load
+     *
+     * @return string The template source code
+     */
+    public function getSource($name)
+    {
+        if ($name instanceof Storage) {
+            return $name->getContent();
+        }
+
+        list($name, $options) = $this->engine->splitTemplateName($name);
+
+        $template = $this->engine->getLoader()->load($name, $options);
+
+        if (false === $template) {
+            throw new \InvalidArgumentException(sprintf('The template "%s" does not exist (renderer: %s).', $name, $options['renderer']));
+        }
+
+        return $template->getContent();
+    }
+
+    /**
+     * Gets the cache key to use for the cache for a given template name.
+     *
+     * @param  string $name string The name of the template to load
+     *
+     * @return string The cache key
+     */
+    public function getCacheKey($name)
+    {
+        if ($name instanceof Storage) {
+            return (string) $name;
+        }
+
+        list($name, $options) = $this->engine->splitTemplateName($name);
+
+        return $name.'_'.serialize($options);
+    }
+
+    /**
+     * Returns true if the template is still fresh.
+     *
+     * @param string    $name The template name
+     * @param timestamp $time The last modification time of the cached template
+     */
+    public function isFresh($name, $time)
+    {
+        if ($name instanceof Storage) {
+            if ($name instanceof FileStorage)
+            {
+                return filemtime((string) $name) < $time;
+            }
+
+            return false;
+        }
+
+        list($name, $options) = $this->engine->splitTemplateName($name);
+
+        return $this->engine->getLoader()->isFresh($name, $options, $time);
+    }
+}

src/Symfony/Framework/TwigBundle/Node/HelperNode.php

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+<?php
+
+namespace Symfony\Framework\TwigBundle\Node;
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ *
+ * @package    Symfony
+ * @subpackage Framework_TwigBundle
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class HelperNode extends \Twig_Node implements \Twig_NodeListInterface
+{
+    protected $name;
+    protected $method;
+    protected $arguments;
+    protected $echo;
+
+    public function __construct($name, $method, \Twig_NodeList $arguments, $echo, $lineno, $tag = null)
+    {
+        parent::__construct($lineno, $tag);
+        $this->name = $name;
+        $this->method = $method;
+        $this->arguments = $arguments;
+        $this->echo = $echo;
+    }
+
+    public function __toString()
+    {
+        return get_class($this).'('.$this->arguments.')';
+    }
+
+    public function getNodes()
+    {
+        return array($this->arguments);
+    }
+
+    public function setNodes(array $nodes)
+    {
+        $this->arguments = $nodes[0];
+    }
+
+    public function compile($compiler)
+    {
+        $compiler->addDebugInfo($this);
+
+        if ($this->echo) {
+            $compiler->raw('echo ');
+        }
+
+        $compiler->write('$context[\'_view\']->'.$this->name.'->'.$this->method.'(');
+
+        $count = count($this->arguments->getNodes());
+        foreach ($this->arguments->getNodes() as $i => $node) {
+            $compiler->subcompile($node);
+
+            if ($i !== $count - 1) {
+                $compiler->raw(', ');
+            }
+        }
+
+        $compiler->raw(");\n");
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+}