Added twig + autoloader external lib management

autoloader.php

@@ -53,17 +53,31 @@
 	*
 	*/
 	function autoloader($className){
-		$path = '';
+		/* [1] Basic processing
+		=========================================================*/
+		/* (1) Explode classname by namespaces */
+		$path = explode('\\', $className);
 
-		/* [1] On utilise le namespace pour localiser
+		/* (2) Check if at least a filename */
-		===============================================*/
+		if( count($path) < 1 )
-		// On remplace les '\' par des '/'
+			throw new \Exception('Missing classname for autoloader.');
-		$path = str_replace('\\', '/', $className) . '.php';
-		$path = __BUILD__.'/'.$path;
 
-		// Si le fichier existe
+		/* (3) Detect if build class or lib class */
-		if( file_exists($path) )
+		$type = $path[0] === 'lib' ? 'lib' : 'build';	
-			require_once $path; // on inclue le fichier
+
+
+		/* [2] Manage type and check file
+		=========================================================*/
+		/* (1) Build path according to type */
+		if( $type === 'lib' )
+			$file = __ROOT__.'/'.implode('/',  $path).'.php';
+		else
+			$file = __BUILD__.'/'.implode('/', $path).'.php';
+
+
+		/* (2) Check file */
+		if( file_exists($file) )
+			require_once $file;
 
 	}
 
@@ -75,6 +89,7 @@
 
 	/* On demarre la session securisee PHP
 	=========================================================*/
-	\manager\sessionManager::session_start();
+	session_start();
+	// \manager\sessionManager::session_start();
 
 ?>

lib/Twig/BaseNodeVisitor.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_BaseNodeVisitor can be used to make node visitors compatible with Twig 1.x and 2.x.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Twig_BaseNodeVisitor implements Twig_NodeVisitorInterface
+{
+    final public function enterNode(Twig_Node $node, Twig_Environment $env)
+    {
+        return $this->doEnterNode($node, $env);
+    }
+
+    final public function leaveNode(Twig_Node $node, Twig_Environment $env)
+    {
+        return $this->doLeaveNode($node, $env);
+    }
+
+    /**
+     * Called before child nodes are visited.
+     *
+     * @return Twig_Node The modified node
+     */
+    abstract protected function doEnterNode(Twig_Node $node, Twig_Environment $env);
+
+    /**
+     * Called after child nodes are visited.
+     *
+     * @return Twig_Node|false The modified node or false if the node must be removed
+     */
+    abstract protected function doLeaveNode(Twig_Node $node, Twig_Environment $env);
+}

lib/Twig/Cache/Filesystem.php

@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Implements a cache on the filesystem.
+ *
+ * @author Andrew Tch <andrew@noop.lv>
+ */
+class Twig_Cache_Filesystem implements Twig_CacheInterface
+{
+    const FORCE_BYTECODE_INVALIDATION = 1;
+
+    private $directory;
+    private $options;
+
+    /**
+     * @param $directory string The root cache directory
+     * @param $options   int    A set of options
+     */
+    public function __construct($directory, $options = 0)
+    {
+        $this->directory = rtrim($directory, '\/').'/';
+        $this->options = $options;
+    }
+
+    public function generateKey($name, $className)
+    {
+        $hash = hash('sha256', $className);
+
+        return $this->directory.$hash[0].$hash[1].'/'.$hash.'.php';
+    }
+
+    public function load($key)
+    {
+        if (file_exists($key)) {
+            @include_once $key;
+        }
+    }
+
+    public function write($key, $content)
+    {
+        $dir = dirname($key);
+        if (!is_dir($dir)) {
+            if (false === @mkdir($dir, 0777, true) && !is_dir($dir)) {
+                throw new RuntimeException(sprintf('Unable to create the cache directory (%s).', $dir));
+            }
+        } elseif (!is_writable($dir)) {
+            throw new RuntimeException(sprintf('Unable to write in the cache directory (%s).', $dir));
+        }
+
+        $tmpFile = tempnam($dir, basename($key));
+        if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $key)) {
+            @chmod($key, 0666 & ~umask());
+
+            if (self::FORCE_BYTECODE_INVALIDATION == ($this->options & self::FORCE_BYTECODE_INVALIDATION)) {
+                // Compile cached file into bytecode cache
+                if (function_exists('opcache_invalidate')) {
+                    opcache_invalidate($key, true);
+                } elseif (function_exists('apc_compile_file')) {
+                    apc_compile_file($key);
+                }
+            }
+
+            return;
+        }
+
+        throw new RuntimeException(sprintf('Failed to write cache file "%s".', $key));
+    }
+
+    public function getTimestamp($key)
+    {
+        if (!file_exists($key)) {
+            return 0;
+        }
+
+        return (int) @filemtime($key);
+    }
+}

lib/Twig/Cache/Null.php

@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Implements a no-cache strategy.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class Twig_Cache_Null implements Twig_CacheInterface
+{
+    public function generateKey($name, $className)
+    {
+        return '';
+    }
+
+    public function write($key, $content)
+    {
+    }
+
+    public function load($key)
+    {
+    }
+
+    public function getTimestamp($key)
+    {
+        return 0;
+    }
+}

lib/Twig/CacheInterface.php

@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by cache classes.
+ *
+ * It is highly recommended to always store templates on the filesystem to
+ * benefit from the PHP opcode cache. This interface is mostly useful if you
+ * need to implement a custom strategy for storing templates on the filesystem.
+ *
+ * @author Andrew Tch <andrew@noop.lv>
+ */
+interface Twig_CacheInterface
+{
+    /**
+     * Generates a cache key for the given template class name.
+     *
+     * @param string $name      The template name
+     * @param string $className The template class name
+     *
+     * @return string
+     */
+    public function generateKey($name, $className);
+
+    /**
+     * Writes the compiled template to cache.
+     *
+     * @param string $key     The cache key
+     * @param string $content The template representation as a PHP class
+     */
+    public function write($key, $content);
+
+    /**
+     * Loads a template from the cache.
+     *
+     * @param string $key The cache key
+     */
+    public function load($key);
+
+    /**
+     * Returns the modification timestamp of a key.
+     *
+     * @param string $key The cache key
+     *
+     * @return int
+     */
+    public function getTimestamp($key);
+}

lib/Twig/Compiler.php

@@ -0,0 +1,238 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Compiles a node to PHP code.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Compiler
+{
+    private $lastLine;
+    private $source;
+    private $indentation;
+    private $env;
+    private $debugInfo = array();
+    private $sourceOffset;
+    private $sourceLine;
+
+    public function __construct(Twig_Environment $env)
+    {
+        $this->env = $env;
+    }
+
+    /**
+     * Returns the environment instance related to this compiler.
+     *
+     * @return Twig_Environment
+     */
+    public function getEnvironment()
+    {
+        return $this->env;
+    }
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    public function getSource()
+    {
+        return $this->source;
+    }
+
+    /**
+     * Compiles a node.
+     *
+     * @param Twig_Node $node        The node to compile
+     * @param int       $indentation The current indentation
+     *
+     * @return $this
+     */
+    public function compile(Twig_Node $node, $indentation = 0)
+    {
+        $this->lastLine = null;
+        $this->source = '';
+        $this->debugInfo = array();
+        $this->sourceOffset = 0;
+        // source code starts at 1 (as we then increment it when we encounter new lines)
+        $this->sourceLine = 1;
+        $this->indentation = $indentation;
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    public function subcompile(Twig_Node $node, $raw = true)
+    {
+        if (false === $raw) {
+            $this->source .= str_repeat(' ', $this->indentation * 4);
+        }
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    /**
+     * Adds a raw string to the compiled code.
+     *
+     * @param string $string The string
+     *
+     * @return $this
+     */
+    public function raw($string)
+    {
+        $this->source .= $string;
+
+        return $this;
+    }
+
+    /**
+     * Writes a string to the compiled code by adding indentation.
+     *
+     * @return $this
+     */
+    public function write(...$strings)
+    {
+        foreach ($strings as $string) {
+            $this->source .= str_repeat(' ', $this->indentation * 4).$string;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Adds a quoted string to the compiled code.
+     *
+     * @param string $value The string
+     *
+     * @return $this
+     */
+    public function string($value)
+    {
+        $this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
+
+        return $this;
+    }
+
+    /**
+     * Returns a PHP representation of a given value.
+     *
+     * @param mixed $value The value to convert
+     *
+     * @return $this
+     */
+    public function repr($value)
+    {
+        if (is_int($value) || is_float($value)) {
+            if (false !== $locale = setlocale(LC_NUMERIC, 0)) {
+                setlocale(LC_NUMERIC, 'C');
+            }
+
+            $this->raw($value);
+
+            if (false !== $locale) {
+                setlocale(LC_NUMERIC, $locale);
+            }
+        } elseif (null === $value) {
+            $this->raw('null');
+        } elseif (is_bool($value)) {
+            $this->raw($value ? 'true' : 'false');
+        } elseif (is_array($value)) {
+            $this->raw('array(');
+            $first = true;
+            foreach ($value as $key => $v) {
+                if (!$first) {
+                    $this->raw(', ');
+                }
+                $first = false;
+                $this->repr($key);
+                $this->raw(' => ');
+                $this->repr($v);
+            }
+            $this->raw(')');
+        } else {
+            $this->string($value);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Adds debugging information.
+     *
+     * @return $this
+     */
+    public function addDebugInfo(Twig_Node $node)
+    {
+        if ($node->getTemplateLine() != $this->lastLine) {
+            $this->write(sprintf("// line %d\n", $node->getTemplateLine()));
+
+            $this->sourceLine += substr_count($this->source, "\n", $this->sourceOffset);
+            $this->sourceOffset = strlen($this->source);
+            $this->debugInfo[$this->sourceLine] = $node->getTemplateLine();
+
+            $this->lastLine = $node->getTemplateLine();
+        }
+
+        return $this;
+    }
+
+    public function getDebugInfo()
+    {
+        ksort($this->debugInfo);
+
+        return $this->debugInfo;
+    }
+
+    /**
+     * Indents the generated code.
+     *
+     * @param int $step The number of indentation to add
+     *
+     * @return $this
+     */
+    public function indent($step = 1)
+    {
+        $this->indentation += $step;
+
+        return $this;
+    }
+
+    /**
+     * Outdents the generated code.
+     *
+     * @param int $step The number of indentation to remove
+     *
+     * @return $this
+     *
+     * @throws LogicException When trying to outdent too much so the indentation would become negative
+     */
+    public function outdent($step = 1)
+    {
+        // can't outdent by more steps than the current indentation level
+        if ($this->indentation < $step) {
+            throw new LogicException('Unable to call outdent() as the indentation would become negative.');
+        }
+
+        $this->indentation -= $step;
+
+        return $this;
+    }
+
+    public function getVarName()
+    {
+        return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
+    }
+}

lib/Twig/Environment.php

@@ -0,0 +1,937 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Stores the Twig configuration.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Environment
+{
+    const VERSION = '2.0.1-DEV';
+    const VERSION_ID = 20001;
+    const MAJOR_VERSION = 2;
+    const MINOR_VERSION = 0;
+    const RELEASE_VERSION = 1;
+    const EXTRA_VERSION = 'DEV';
+
+    private $charset;
+    private $loader;
+    private $debug;
+    private $autoReload;
+    private $cache;
+    private $lexer;
+    private $parser;
+    private $compiler;
+    private $baseTemplateClass;
+    private $globals = array();
+    private $resolvedGlobals;
+    private $loadedTemplates;
+    private $strictVariables;
+    private $templateClassPrefix = '__TwigTemplate_';
+    private $originalCache;
+    private $extensionSet;
+    private $runtimeLoaders = array();
+    private $runtimes = array();
+    private $optionsHash;
+
+    /**
+     * Constructor.
+     *
+     * Available options:
+     *
+     *  * debug: When set to true, it automatically set "auto_reload" to true as
+     *           well (default to false).
+     *
+     *  * charset: The charset used by the templates (default to UTF-8).
+     *
+     *  * base_template_class: The base template class to use for generated
+     *                         templates (default to Twig_Template).
+     *
+     *  * cache: An absolute path where to store the compiled templates,
+     *           a Twig_Cache_Interface implementation,
+     *           or false to disable compilation cache (default).
+     *
+     *  * auto_reload: Whether to reload the template if the original source changed.
+     *                 If you don't provide the auto_reload option, it will be
+     *                 determined automatically based on the debug value.
+     *
+     *  * strict_variables: Whether to ignore invalid variables in templates
+     *                      (default to false).
+     *
+     *  * autoescape: Whether to enable auto-escaping (default to html):
+     *                  * false: disable auto-escaping
+     *                  * html, js: set the autoescaping to one of the supported strategies
+     *                  * name: set the autoescaping strategy based on the template name extension
+     *                  * PHP callback: a PHP callback that returns an escaping strategy based on the template "name"
+     *
+     *  * optimizations: A flag that indicates which optimizations to apply
+     *                   (default to -1 which means that all optimizations are enabled;
+     *                   set it to 0 to disable).
+     *
+     * @param Twig_LoaderInterface $loader
+     * @param array                $options An array of options
+     */
+    public function __construct(Twig_LoaderInterface $loader, $options = array())
+    {
+        $this->setLoader($loader);
+
+        $options = array_merge(array(
+            'debug' => false,
+            'charset' => 'UTF-8',
+            'base_template_class' => 'Twig_Template',
+            'strict_variables' => false,
+            'autoescape' => 'html',
+            'cache' => false,
+            'auto_reload' => null,
+            'optimizations' => -1,
+        ), $options);
+
+        $this->debug = (bool) $options['debug'];
+        $this->setCharset($options['charset']);
+        $this->baseTemplateClass = $options['base_template_class'];
+        $this->autoReload = null === $options['auto_reload'] ? $this->debug : (bool) $options['auto_reload'];
+        $this->strictVariables = (bool) $options['strict_variables'];
+        $this->setCache($options['cache']);
+        $this->extensionSet = new Twig_ExtensionSet();
+
+        $this->addExtension(new Twig_Extension_Core());
+        $this->addExtension(new Twig_Extension_Escaper($options['autoescape']));
+        $this->addExtension(new Twig_Extension_Optimizer($options['optimizations']));
+    }
+
+    /**
+     * Gets the base template class for compiled templates.
+     *
+     * @return string The base template class name
+     */
+    public function getBaseTemplateClass()
+    {
+        return $this->baseTemplateClass;
+    }
+
+    /**
+     * Sets the base template class for compiled templates.
+     *
+     * @param string $class The base template class name
+     */
+    public function setBaseTemplateClass($class)
+    {
+        $this->baseTemplateClass = $class;
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Enables debugging mode.
+     */
+    public function enableDebug()
+    {
+        $this->debug = true;
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Disables debugging mode.
+     */
+    public function disableDebug()
+    {
+        $this->debug = false;
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Checks if debug mode is enabled.
+     *
+     * @return bool true if debug mode is enabled, false otherwise
+     */
+    public function isDebug()
+    {
+        return $this->debug;
+    }
+
+    /**
+     * Enables the auto_reload option.
+     */
+    public function enableAutoReload()
+    {
+        $this->autoReload = true;
+    }
+
+    /**
+     * Disables the auto_reload option.
+     */
+    public function disableAutoReload()
+    {
+        $this->autoReload = false;
+    }
+
+    /**
+     * Checks if the auto_reload option is enabled.
+     *
+     * @return bool true if auto_reload is enabled, false otherwise
+     */
+    public function isAutoReload()
+    {
+        return $this->autoReload;
+    }
+
+    /**
+     * Enables the strict_variables option.
+     */
+    public function enableStrictVariables()
+    {
+        $this->strictVariables = true;
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Disables the strict_variables option.
+     */
+    public function disableStrictVariables()
+    {
+        $this->strictVariables = false;
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Checks if the strict_variables option is enabled.
+     *
+     * @return bool true if strict_variables is enabled, false otherwise
+     */
+    public function isStrictVariables()
+    {
+        return $this->strictVariables;
+    }
+
+    /**
+     * Gets the current cache implementation.
+     *
+     * @param bool $original Whether to return the original cache option or the real cache instance
+     *
+     * @return Twig_CacheInterface|string|false A Twig_CacheInterface implementation,
+     *                                          an absolute path to the compiled templates,
+     *                                          or false to disable cache
+     */
+    public function getCache($original = true)
+    {
+        return $original ? $this->originalCache : $this->cache;
+    }
+
+    /**
+     * Sets the current cache implementation.
+     *
+     * @param Twig_CacheInterface|string|false $cache A Twig_CacheInterface implementation,
+     *                                                an absolute path to the compiled templates,
+     *                                                or false to disable cache
+     */
+    public function setCache($cache)
+    {
+        if (is_string($cache)) {
+            $this->originalCache = $cache;
+            $this->cache = new Twig_Cache_Filesystem($cache);
+        } elseif (false === $cache) {
+            $this->originalCache = $cache;
+            $this->cache = new Twig_Cache_Null();
+        } elseif ($cache instanceof Twig_CacheInterface) {
+            $this->originalCache = $this->cache = $cache;
+        } else {
+            throw new LogicException(sprintf('Cache can only be a string, false, or a Twig_CacheInterface implementation.'));
+        }
+    }
+
+    /**
+     * Gets the template class associated with the given string.
+     *
+     * The generated template class is based on the following parameters:
+     *
+     *  * The cache key for the given template;
+     *  * The currently enabled extensions;
+     *  * Whether the Twig C extension is available or not;
+     *  * PHP version;
+     *  * Twig version;
+     *  * Options with what environment was created.
+     *
+     * @param string   $name  The name for which to calculate the template class name
+     * @param int|null $index The index if it is an embedded template
+     *
+     * @return string The template class name
+     */
+    public function getTemplateClass($name, $index = null)
+    {
+        $key = $this->getLoader()->getCacheKey($name).$this->optionsHash;
+
+        return $this->templateClassPrefix.hash('sha256', $key).(null === $index ? '' : '_'.$index);
+    }
+
+    /**
+     * Renders a template.
+     *
+     * @param string $name    The template name
+     * @param array  $context An array of parameters to pass to the template
+     *
+     * @return string The rendered template
+     *
+     * @throws Twig_Error_Loader  When the template cannot be found
+     * @throws Twig_Error_Syntax  When an error occurred during compilation
+     * @throws Twig_Error_Runtime When an error occurred during rendering
+     */
+    public function render($name, array $context = array())
+    {
+        return $this->loadTemplate($name)->render($context);
+    }
+
+    /**
+     * Displays a template.
+     *
+     * @param string $name    The template name
+     * @param array  $context An array of parameters to pass to the template
+     *
+     * @throws Twig_Error_Loader  When the template cannot be found
+     * @throws Twig_Error_Syntax  When an error occurred during compilation
+     * @throws Twig_Error_Runtime When an error occurred during rendering
+     */
+    public function display($name, array $context = array())
+    {
+        $this->loadTemplate($name)->display($context);
+    }
+
+    /**
+     * Loads a template.
+     *
+     * @param string|Twig_TemplateWrapper|Twig_Template $name The template name
+     *
+     * @return Twig_TemplateWrapper
+     */
+    public function load($name)
+    {
+        if ($name instanceof Twig_TemplateWrapper) {
+            return $name;
+        }
+
+        if ($name instanceof Twig_Template) {
+            return new Twig_TemplateWrapper($this, $name);
+        }
+
+        return new Twig_TemplateWrapper($this, $this->loadTemplate($name));
+    }
+
+    /**
+     * Loads a template internal representation.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @param string $name  The template name
+     * @param int    $index The index if it is an embedded template
+     *
+     * @return Twig_Template A template instance representing the given template name
+     *
+     * @throws Twig_Error_Loader When the template cannot be found
+     * @throws Twig_Error_Syntax When an error occurred during compilation
+     *
+     * @internal
+     */
+    public function loadTemplate($name, $index = null)
+    {
+        $cls = $this->getTemplateClass($name, $index);
+
+        if (isset($this->loadedTemplates[$cls])) {
+            return $this->loadedTemplates[$cls];
+        }
+
+        if (!class_exists($cls, false)) {
+            $key = $this->cache->generateKey($name, $cls);
+
+            if (!$this->isAutoReload() || $this->isTemplateFresh($name, $this->cache->getTimestamp($key))) {
+                $this->cache->load($key);
+            }
+
+            if (!class_exists($cls, false)) {
+                $content = $this->compileSource($this->getLoader()->getSourceContext($name));
+                $this->cache->write($key, $content);
+                $this->cache->load($key);
+
+                if (!class_exists($cls, false)) {
+                    /* Last line of defense if either $this->bcWriteCacheFile was used,
+                     * $this->cache is implemented as a no-op or we have a race condition
+                     * where the cache was cleared between the above calls to write to and load from
+                     * the cache.
+                     */
+                    eval('?>'.$content);
+                }
+            }
+        }
+
+        // to be removed in 3.0
+        $this->extensionSet->initRuntime($this);
+
+        return $this->loadedTemplates[$cls] = new $cls($this);
+    }
+
+    /**
+     * Creates a template from source.
+     *
+     * This method should not be used as a generic way to load templates.
+     *
+     * @param string $template The template name
+     *
+     * @return Twig_Template A template instance representing the given template name
+     *
+     * @throws Twig_Error_Loader When the template cannot be found
+     * @throws Twig_Error_Syntax When an error occurred during compilation
+     */
+    public function createTemplate($template)
+    {
+        $name = sprintf('__string_template__%s', hash('sha256', uniqid(mt_rand(), true), false));
+
+        $loader = new Twig_Loader_Chain(array(
+            new Twig_Loader_Array(array($name => $template)),
+            $current = $this->getLoader(),
+        ));
+
+        $this->setLoader($loader);
+        try {
+            $template = $this->loadTemplate($name);
+        } finally {
+            $this->setLoader($current);
+        }
+
+        return $template;
+    }
+
+    /**
+     * Returns true if the template is still fresh.
+     *
+     * Besides checking the loader for freshness information,
+     * this method also checks if the enabled extensions have
+     * not changed.
+     *
+     * @param string $name The template name
+     * @param int    $time The last modification time of the cached template
+     *
+     * @return bool true if the template is fresh, false otherwise
+     */
+    public function isTemplateFresh($name, $time)
+    {
+        return $this->extensionSet->getLastModified() <= $time && $this->getLoader()->isFresh($name, $time);
+    }
+
+    /**
+     * Tries to load a template consecutively from an array.
+     *
+     * Similar to loadTemplate() but it also accepts Twig_Template instances and an array
+     * of templates where each is tried to be loaded.
+     *
+     * @param string|Twig_Template|array $names A template or an array of templates to try consecutively
+     *
+     * @return Twig_Template
+     *
+     * @throws Twig_Error_Loader When none of the templates can be found
+     * @throws Twig_Error_Syntax When an error occurred during compilation
+     */
+    public function resolveTemplate($names)
+    {
+        if (!is_array($names)) {
+            $names = array($names);
+        }
+
+        foreach ($names as $name) {
+            if ($name instanceof Twig_Template) {
+                return $name;
+            }
+
+            try {
+                return $this->loadTemplate($name);
+            } catch (Twig_Error_Loader $e) {
+            }
+        }
+
+        if (1 === count($names)) {
+            throw $e;
+        }
+
+        throw new Twig_Error_Loader(sprintf('Unable to find one of the following templates: "%s".', implode('", "', $names)));
+    }
+
+    public function setLexer(Twig_Lexer $lexer)
+    {
+        $this->lexer = $lexer;
+    }
+
+    /**
+     * Tokenizes a source code.
+     *
+     * @return Twig_TokenStream
+     *
+     * @throws Twig_Error_Syntax When the code is syntactically wrong
+     */
+    public function tokenize(Twig_Source $source)
+    {
+        if (null === $this->lexer) {
+            $this->lexer = new Twig_Lexer($this);
+        }
+
+        return $this->lexer->tokenize($source);
+    }
+
+    public function setParser(Twig_Parser $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    /**
+     * Converts a token stream to a node tree.
+     *
+     * @return Twig_Node_Module
+     *
+     * @throws Twig_Error_Syntax When the token stream is syntactically or semantically wrong
+     */
+    public function parse(Twig_TokenStream $stream)
+    {
+        if (null === $this->parser) {
+            $this->parser = new Twig_Parser($this);
+        }
+
+        return $this->parser->parse($stream);
+    }
+
+    public function setCompiler(Twig_Compiler $compiler)
+    {
+        $this->compiler = $compiler;
+    }
+
+    /**
+     * Compiles a node and returns the PHP code.
+     *
+     * @return string The compiled PHP source code
+     */
+    public function compile(Twig_Node $node)
+    {
+        if (null === $this->compiler) {
+            $this->compiler = new Twig_Compiler($this);
+        }
+
+        return $this->compiler->compile($node)->getSource();
+    }
+
+    /**
+     * Compiles a template source code.
+     *
+     * @return string The compiled PHP source code
+     *
+     * @throws Twig_Error_Syntax When there was an error during tokenizing, parsing or compiling
+     */
+    public function compileSource(Twig_Source $source)
+    {
+        try {
+            return $this->compile($this->parse($this->tokenize($source)));
+        } catch (Twig_Error $e) {
+            $e->setSourceContext($source);
+            throw $e;
+        } catch (Exception $e) {
+            throw new Twig_Error_Syntax(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $source, $e);
+        }
+    }
+
+    public function setLoader(Twig_LoaderInterface $loader)
+    {
+        $this->loader = $loader;
+    }
+
+    /**
+     * Gets the Loader instance.
+     *
+     * @return Twig_LoaderInterface
+     */
+    public function getLoader()
+    {
+        return $this->loader;
+    }
+
+    /**
+     * Sets the default template charset.
+     *
+     * @param string $charset The default charset
+     */
+    public function setCharset($charset)
+    {
+        if ('UTF8' === $charset = strtoupper($charset)) {
+            // iconv on Windows requires "UTF-8" instead of "UTF8"
+            $charset = 'UTF-8';
+        }
+
+        $this->charset = $charset;
+    }
+
+    /**
+     * Gets the default template charset.
+     *
+     * @return string The default charset
+     */
+    public function getCharset()
+    {
+        return $this->charset;
+    }
+
+    /**
+     * Returns true if the given extension is registered.
+     *
+     * @param string $class The extension class name
+     *
+     * @return bool Whether the extension is registered or not
+     */
+    public function hasExtension($class)
+    {
+        return $this->extensionSet->hasExtension($class);
+    }
+
+    /**
+     * Adds a runtime loader.
+     */
+    public function addRuntimeLoader(Twig_RuntimeLoaderInterface $loader)
+    {
+        $this->runtimeLoaders[] = $loader;
+    }
+
+    /**
+     * Gets an extension by class name.
+     *
+     * @param string $class The extension class name
+     *
+     * @return Twig_ExtensionInterface
+     */
+    public function getExtension($class)
+    {
+        return $this->extensionSet->getExtension($class);
+    }
+
+    /**
+     * Returns the runtime implementation of a Twig element (filter/function/test).
+     *
+     * @param string $class A runtime class name
+     *
+     * @return object The runtime implementation
+     *
+     * @throws Twig_Error_Runtime When the template cannot be found
+     */
+    public function getRuntime($class)
+    {
+        if (isset($this->runtimes[$class])) {
+            return $this->runtimes[$class];
+        }
+
+        foreach ($this->runtimeLoaders as $loader) {
+            if (null !== $runtime = $loader->load($class)) {
+                return $this->runtimes[$class] = $runtime;
+            }
+        }
+
+        throw new Twig_Error_Runtime(sprintf('Unable to load the "%s" runtime.', $class));
+    }
+
+    public function addExtension(Twig_ExtensionInterface $extension)
+    {
+        $this->extensionSet->addExtension($extension);
+        $this->updateOptionsHash();
+    }
+
+    /**
+     * Registers an array of extensions.
+     *
+     * @param array $extensions An array of extensions
+     */
+    public function setExtensions(array $extensions)
+    {
+        $this->extensionSet->setExtensions($extensions);
+    }
+
+    /**
+     * Returns all registered extensions.
+     *
+     * @return Twig_ExtensionInterface[] An array of extensions (keys are for internal usage only and should not be relied on)
+     */
+    public function getExtensions()
+    {
+        return $this->extensionSet->getExtensions();
+    }
+
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        $this->extensionSet->addTokenParser($parser);
+    }
+
+    /**
+     * Gets the registered Token Parsers.
+     *
+     * @return Twig_TokenParserInterface[]
+     *
+     * @internal
+     */
+    public function getTokenParsers()
+    {
+        return $this->extensionSet->getTokenParsers();
+    }
+
+    /**
+     * Gets registered tags.
+     *
+     * @return Twig_TokenParserInterface[]
+     *
+     * @internal
+     */
+    public function getTags()
+    {
+        $tags = array();
+        foreach ($this->getTokenParsers() as $parser) {
+            $tags[$parser->getTag()] = $parser;
+        }
+
+        return $tags;
+    }
+
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        $this->extensionSet->addNodeVisitor($visitor);
+    }
+
+    /**
+     * Gets the registered Node Visitors.
+     *
+     * @return Twig_NodeVisitorInterface[]
+     *
+     * @internal
+     */
+    public function getNodeVisitors()
+    {
+        return $this->extensionSet->getNodeVisitors();
+    }
+
+    public function addFilter(Twig_Filter $filter)
+    {
+        $this->extensionSet->addFilter($filter);
+    }
+
+    /**
+     * Get a filter by name.
+     *
+     * Subclasses may override this method and load filters differently;
+     * so no list of filters is available.
+     *
+     * @param string $name The filter name
+     *
+     * @return Twig_Filter|false A Twig_Filter instance or false if the filter does not exist
+     *
+     * @internal
+     */
+    public function getFilter($name)
+    {
+        return $this->extensionSet->getFilter($name);
+    }
+
+    public function registerUndefinedFilterCallback(callable $callable)
+    {
+        $this->extensionSet->registerUndefinedFilterCallback($callable);
+    }
+
+    /**
+     * Gets the registered Filters.
+     *
+     * Be warned that this method cannot return filters defined with registerUndefinedFilterCallback.
+     *
+     * @return Twig_Filter[]
+     *
+     * @see registerUndefinedFilterCallback
+     *
+     * @internal
+     */
+    public function getFilters()
+    {
+        return $this->extensionSet->getFilters();
+    }
+
+    /**
+     * Registers a Test.
+     *
+     * @param Twig_Test $test A Twig_Test instance
+     */
+    public function addTest(Twig_Test $test)
+    {
+        $this->extensionSet->addTest($test);
+    }
+
+    /**
+     * Gets the registered Tests.
+     *
+     * @return Twig_Test[]
+     *
+     * @internal
+     */
+    public function getTests()
+    {
+        return $this->extensionSet->getTests();
+    }
+
+    /**
+     * Gets a test by name.
+     *
+     * @param string $name The test name
+     *
+     * @return Twig_Test|false A Twig_Test instance or false if the test does not exist
+     *
+     * @internal
+     */
+    public function getTest($name)
+    {
+        return $this->extensionSet->getTest($name);
+    }
+
+    public function addFunction(Twig_Function $function)
+    {
+        $this->extensionSet->addFunction($function);
+    }
+
+    /**
+     * Get a function by name.
+     *
+     * Subclasses may override this method and load functions differently;
+     * so no list of functions is available.
+     *
+     * @param string $name function name
+     *
+     * @return Twig_Function|false A Twig_Function instance or false if the function does not exist
+     *
+     * @internal
+     */
+    public function getFunction($name)
+    {
+        return $this->extensionSet->getFunction($name);
+    }
+
+    public function registerUndefinedFunctionCallback(callable $callable)
+    {
+        $this->extensionSet->registerUndefinedFunctionCallback($callable);
+    }
+
+    /**
+     * Gets registered functions.
+     *
+     * Be warned that this method cannot return functions defined with registerUndefinedFunctionCallback.
+     *
+     * @return Twig_Function[]
+     *
+     * @see registerUndefinedFunctionCallback
+     *
+     * @internal
+     */
+    public function getFunctions()
+    {
+        return $this->extensionSet->getFunctions();
+    }
+
+    /**
+     * Registers a Global.
+     *
+     * New globals can be added before compiling or rendering a template;
+     * but after, you can only update existing globals.
+     *
+     * @param string $name  The global name
+     * @param mixed  $value The global value
+     */
+    public function addGlobal($name, $value)
+    {
+        if ($this->extensionSet->isInitialized() && !array_key_exists($name, $this->getGlobals())) {
+            throw new LogicException(sprintf('Unable to add global "%s" as the runtime or the extensions have already been initialized.', $name));
+        }
+
+        if (null !== $this->resolvedGlobals) {
+            $this->resolvedGlobals[$name] = $value;
+        } else {
+            $this->globals[$name] = $value;
+        }
+    }
+
+    /**
+     * Gets the registered Globals.
+     *
+     * @return array An array of globals
+     *
+     * @internal
+     */
+    public function getGlobals()
+    {
+        if ($this->extensionSet->isInitialized()) {
+            if (null === $this->resolvedGlobals) {
+                $this->resolvedGlobals = array_merge($this->extensionSet->getGlobals(), $this->globals);
+            }
+
+            return $this->resolvedGlobals;
+        }
+
+        return array_merge($this->extensionSet->getGlobals(), $this->globals);
+    }
+
+    /**
+     * Merges a context with the defined globals.
+     *
+     * @param array $context An array representing the context
+     *
+     * @return array The context merged with the globals
+     */
+    public function mergeGlobals(array $context)
+    {
+        // we don't use array_merge as the context being generally
+        // bigger than globals, this code is faster.
+        foreach ($this->getGlobals() as $key => $value) {
+            if (!array_key_exists($key, $context)) {
+                $context[$key] = $value;
+            }
+        }
+
+        return $context;
+    }
+
+    /**
+     * Gets the registered unary Operators.
+     *
+     * @return array An array of unary operators
+     *
+     * @internal
+     */
+    public function getUnaryOperators()
+    {
+        return $this->extensionSet->getUnaryOperators();
+    }
+
+    /**
+     * Gets the registered binary Operators.
+     *
+     * @return array An array of binary operators
+     *
+     * @internal
+     */
+    public function getBinaryOperators()
+    {
+        return $this->extensionSet->getBinaryOperators();
+    }
+
+    private function updateOptionsHash()
+    {
+        $this->optionsHash = implode(':', array(
+            $this->extensionSet->getSignature(),
+            PHP_MAJOR_VERSION,
+            PHP_MINOR_VERSION,
+            self::VERSION,
+            (int) $this->debug,
+            $this->baseTemplateClass,
+            (int) $this->strictVariables,
+        ));
+    }
+}

lib/Twig/Error.php

@@ -0,0 +1,267 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig base exception.
+ *
+ * This exception class and its children must only be used when
+ * an error occurs during the loading of a template, when a syntax error
+ * is detected in a template, or when rendering a template. Other
+ * errors must use regular PHP exception classes (like when the template
+ * cache directory is not writable for instance).
+ *
+ * To help debugging template issues, this class tracks the original template
+ * name and line where the error occurred.
+ *
+ * Whenever possible, you must set these information (original template name
+ * and line number) yourself by passing them to the constructor. If some or all
+ * these information are not available from where you throw the exception, then
+ * this class will guess them automatically (when the line number is set to -1
+ * and/or the name is set to null). As this is a costly operation, this
+ * can be disabled by passing false for both the name and the line number
+ * when creating a new instance of this class.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error extends Exception
+{
+    private $lineno;
+    private $name;
+    private $rawMessage;
+    private $sourcePath;
+    private $sourceCode;
+
+    /**
+     * Constructor.
+     *
+     * Set both the line number and the name to false to
+     * disable automatic guessing of the original template name
+     * and line number.
+     *
+     * Set the line number to -1 to enable its automatic guessing.
+     * Set the name to null to enable its automatic guessing.
+     *
+     * By default, automatic guessing is enabled.
+     *
+     * @param string                  $message  The error message
+     * @param int                     $lineno   The template line where the error occurred
+     * @param Twig_Source|string|null $source   The source context where the error occurred
+     * @param Exception               $previous The previous exception
+     */
+    public function __construct($message, $lineno = -1, $source = null, Exception $previous = null)
+    {
+        parent::__construct('', 0, $previous);
+
+        if (null === $source) {
+            $name = null;
+        } elseif (!$source instanceof Twig_Source) {
+            // for compat with the Twig C ext., passing the template name as string is accepted
+            $name = $source;
+        } else {
+            $name = $source->getName();
+            $this->sourceCode = $source->getCode();
+            $this->sourcePath = $source->getPath();
+        }
+
+        $this->lineno = $lineno;
+        $this->name = $name;
+
+        if (-1 === $lineno || null === $name || null === $this->sourcePath) {
+            $this->guessTemplateInfo();
+        }
+
+        $this->rawMessage = $message;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * Gets the raw message.
+     *
+     * @return string The raw message
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Gets the template line where the error occurred.
+     *
+     * @return int The template line
+     */
+    public function getTemplateLine()
+    {
+        return $this->lineno;
+    }
+
+    /**
+     * Sets the template line where the error occurred.
+     *
+     * @param int $lineno The template line
+     */
+    public function setTemplateLine($lineno)
+    {
+        $this->lineno = $lineno;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * Gets the source context of the Twig template where the error occurred.
+     *
+     * @return Twig_Source|null
+     */
+    public function getSourceContext()
+    {
+        return $this->name ? new Twig_Source($this->sourceCode, $this->name, $this->sourcePath) : null;
+    }
+
+    /**
+     * Sets the source context of the Twig template where the error occurred.
+     */
+    public function setSourceContext(Twig_Source $source = null)
+    {
+        if (null === $source) {
+            $this->sourceCode = $this->name = $this->sourcePath = null;
+        } else {
+            $this->sourceCode = $source->getCode();
+            $this->name = $source->getName();
+            $this->sourcePath = $source->getPath();
+        }
+
+        $this->updateRepr();
+    }
+
+    public function guess()
+    {
+        $this->guessTemplateInfo();
+        $this->updateRepr();
+    }
+
+    public function appendMessage($rawMessage)
+    {
+        $this->rawMessage .= $rawMessage;
+        $this->updateRepr();
+    }
+
+    private function updateRepr()
+    {
+        $this->message = $this->rawMessage;
+
+        if ($this->sourcePath && $this->lineno > 0) {
+            $this->file = $this->sourcePath;
+            $this->line = $this->lineno;
+
+            return;
+        }
+
+        $dot = false;
+        if ('.' === substr($this->message, -1)) {
+            $this->message = substr($this->message, 0, -1);
+            $dot = true;
+        }
+
+        $questionMark = false;
+        if ('?' === substr($this->message, -1)) {
+            $this->message = substr($this->message, 0, -1);
+            $questionMark = true;
+        }
+
+        if ($this->name) {
+            if (is_string($this->name) || (is_object($this->name) && method_exists($this->name, '__toString'))) {
+                $name = sprintf('"%s"', $this->name);
+            } else {
+                $name = json_encode($this->name);
+            }
+            $this->message .= sprintf(' in %s', $name);
+        }
+
+        if ($this->lineno && $this->lineno >= 0) {
+            $this->message .= sprintf(' at line %d', $this->lineno);
+        }
+
+        if ($dot) {
+            $this->message .= '.';
+        }
+
+        if ($questionMark) {
+            $this->message .= '?';
+        }
+    }
+
+    private function guessTemplateInfo()
+    {
+        $template = null;
+        $templateClass = null;
+
+        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS | DEBUG_BACKTRACE_PROVIDE_OBJECT);
+        foreach ($backtrace as $trace) {
+            if (isset($trace['object']) && $trace['object'] instanceof Twig_Template && 'Twig_Template' !== get_class($trace['object'])) {
+                $currentClass = get_class($trace['object']);
+                $isEmbedContainer = 0 === strpos($templateClass, $currentClass);
+                if (null === $this->name || ($this->name == $trace['object']->getTemplateName() && !$isEmbedContainer)) {
+                    $template = $trace['object'];
+                    $templateClass = get_class($trace['object']);
+                }
+            }
+        }
+
+        // update template name
+        if (null !== $template && null === $this->name) {
+            $this->name = $template->getTemplateName();
+        }
+
+        // update template path if any
+        if (null !== $template && null === $this->sourcePath) {
+            $src = $template->getSourceContext();
+            $this->sourceCode = $src->getCode();
+            $this->sourcePath = $src->getPath();
+        }
+
+        if (null === $template || $this->lineno > -1) {
+            return;
+        }
+
+        $r = new ReflectionObject($template);
+        $file = $r->getFileName();
+
+        // hhvm has a bug where eval'ed files comes out as the current directory
+        if (is_dir($file)) {
+            $file = '';
+        }
+
+        $exceptions = array($e = $this);
+        while ($e = $e->getPrevious()) {
+            $exceptions[] = $e;
+        }
+
+        while ($e = array_pop($exceptions)) {
+            $traces = $e->getTrace();
+            array_unshift($traces, array('file' => $e->getFile(), 'line' => $e->getLine()));
+
+            while ($trace = array_shift($traces)) {
+                if (!isset($trace['file']) || !isset($trace['line']) || $file != $trace['file']) {
+                    continue;
+                }
+
+                foreach ($template->getDebugInfo() as $codeLine => $templateLine) {
+                    if ($codeLine <= $trace['line']) {
+                        // update template line
+                        $this->lineno = $templateLine;
+
+                        return;
+                    }
+                }
+            }
+        }
+    }
+}

lib/Twig/Error/Loader.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs during template loading.
+ *
+ * Automatic template information guessing is always turned off as
+ * if a template cannot be loaded, there is nothing to guess.
+ * However, when a template is loaded from another one, then, we need
+ * to find the current context and this is automatically done by
+ * Twig_Template::displayWithErrorHandling().
+ *
+ * This strategy makes Twig_Environment::resolveTemplate() much faster.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Loader extends Twig_Error
+{
+    public function __construct($message, $lineno = -1, $source = null, Exception $previous = null)
+    {
+        if (PHP_VERSION_ID < 50300) {
+            $this->previous = $previous;
+            Exception::__construct('');
+        } else {
+            Exception::__construct('', 0, $previous);
+        }
+        $this->appendMessage($message);
+        $this->setTemplateLine(false);
+    }
+}

lib/Twig/Error/Runtime.php

@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs at runtime.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Runtime extends Twig_Error
+{
+}

lib/Twig/Error/Syntax.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when a syntax error occurs during lexing or parsing of a template.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Syntax extends Twig_Error
+{
+    /**
+     * Tweaks the error message to include suggestions.
+     *
+     * @param string $name  The original name of the item that does not exist
+     * @param array  $items An array of possible items
+     */
+    public function addSuggestions($name, array $items)
+    {
+        $alternatives = array();
+        foreach ($items as $item) {
+            $lev = levenshtein($name, $item);
+            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
+                $alternatives[$item] = $lev;
+            }
+        }
+
+        if (!$alternatives) {
+            return;
+        }
+
+        asort($alternatives);
+
+        $this->appendMessage(sprintf(' Did you mean "%s"?', implode('", "', array_keys($alternatives))));
+    }
+}

lib/Twig/ExistsLoaderInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Empty interface for Twig 1.x compatibility.
+ */
+interface Twig_ExistsLoaderInterface extends Twig_LoaderInterface
+{
+}

lib/Twig/ExpressionParser.php

@@ -0,0 +1,714 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Parses expressions.
+ *
+ * This parser implements a "Precedence climbing" algorithm.
+ *
+ * @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
+ * @see http://en.wikipedia.org/wiki/Operator-precedence_parser
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class Twig_ExpressionParser
+{
+    const OPERATOR_LEFT = 1;
+    const OPERATOR_RIGHT = 2;
+
+    private $parser;
+    private $env;
+    private $unaryOperators;
+    private $binaryOperators;
+
+    public function __construct(Twig_Parser $parser, Twig_Environment $env)
+    {
+        $this->parser = $parser;
+        $this->env = $env;
+        $this->unaryOperators = $env->getUnaryOperators();
+        $this->binaryOperators = $env->getBinaryOperators();
+    }
+
+    public function parseExpression($precedence = 0)
+    {
+        $expr = $this->getPrimary();
+        $token = $this->parser->getCurrentToken();
+        while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
+            $op = $this->binaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+
+            if ('is not' === $token->getValue()) {
+                $expr = $this->parseNotTestExpression($expr);
+            } elseif ('is' === $token->getValue()) {
+                $expr = $this->parseTestExpression($expr);
+            } elseif (isset($op['callable'])) {
+                $expr = $op['callable']($this->parser, $expr);
+            } else {
+                $expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
+                $class = $op['class'];
+                $expr = new $class($expr, $expr1, $token->getLine());
+            }
+
+            $token = $this->parser->getCurrentToken();
+        }
+
+        if (0 === $precedence) {
+            return $this->parseConditionalExpression($expr);
+        }
+
+        return $expr;
+    }
+
+    private function getPrimary()
+    {
+        $token = $this->parser->getCurrentToken();
+
+        if ($this->isUnary($token)) {
+            $operator = $this->unaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression($operator['precedence']);
+            $class = $operator['class'];
+
+            return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
+        } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
+
+            return $this->parsePostfixExpression($expr);
+        }
+
+        return $this->parsePrimaryExpression();
+    }
+
+    private function parseConditionalExpression($expr)
+    {
+        while ($this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, '?')) {
+            if (!$this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $expr2 = $this->parseExpression();
+                if ($this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                    $expr3 = $this->parseExpression();
+                } else {
+                    $expr3 = new Twig_Node_Expression_Constant('', $this->parser->getCurrentToken()->getLine());
+                }
+            } else {
+                $expr2 = $expr;
+                $expr3 = $this->parseExpression();
+            }
+
+            $expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
+        }
+
+        return $expr;
+    }
+
+    private function isUnary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
+    }
+
+    private function isBinary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
+    }
+
+    public function parsePrimaryExpression()
+    {
+        $token = $this->parser->getCurrentToken();
+        switch ($token->getType()) {
+            case Twig_Token::NAME_TYPE:
+                $this->parser->getStream()->next();
+                switch ($token->getValue()) {
+                    case 'true':
+                    case 'TRUE':
+                        $node = new Twig_Node_Expression_Constant(true, $token->getLine());
+                        break;
+
+                    case 'false':
+                    case 'FALSE':
+                        $node = new Twig_Node_Expression_Constant(false, $token->getLine());
+                        break;
+
+                    case 'none':
+                    case 'NONE':
+                    case 'null':
+                    case 'NULL':
+                        $node = new Twig_Node_Expression_Constant(null, $token->getLine());
+                        break;
+
+                    default:
+                        if ('(' === $this->parser->getCurrentToken()->getValue()) {
+                            $node = $this->getFunctionNode($token->getValue(), $token->getLine());
+                        } else {
+                            $node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
+                        }
+                }
+                break;
+
+            case Twig_Token::NUMBER_TYPE:
+                $this->parser->getStream()->next();
+                $node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+                break;
+
+            case Twig_Token::STRING_TYPE:
+            case Twig_Token::INTERPOLATION_START_TYPE:
+                $node = $this->parseStringExpression();
+                break;
+
+            case Twig_Token::OPERATOR_TYPE:
+                if (preg_match(Twig_Lexer::REGEX_NAME, $token->getValue(), $matches) && $matches[0] == $token->getValue()) {
+                    // in this context, string operators are variable names
+                    $this->parser->getStream()->next();
+                    $node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
+                    break;
+                } elseif (isset($this->unaryOperators[$token->getValue()])) {
+                    $class = $this->unaryOperators[$token->getValue()]['class'];
+
+                    $ref = new ReflectionClass($class);
+                    $negClass = 'Twig_Node_Expression_Unary_Neg';
+                    $posClass = 'Twig_Node_Expression_Unary_Pos';
+                    if (!(in_array($ref->getName(), array($negClass, $posClass)) || $ref->isSubclassOf($negClass) || $ref->isSubclassOf($posClass))) {
+                        throw new Twig_Error_Syntax(sprintf('Unexpected unary operator "%s".', $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
+                    }
+
+                    $this->parser->getStream()->next();
+                    $expr = $this->parsePrimaryExpression();
+
+                    $node = new $class($expr, $token->getLine());
+                    break;
+                }
+
+            default:
+                if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
+                    $node = $this->parseArrayExpression();
+                } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '{')) {
+                    $node = $this->parseHashExpression();
+                } else {
+                    throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s".', Twig_Token::typeToEnglish($token->getType()), $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
+                }
+        }
+
+        return $this->parsePostfixExpression($node);
+    }
+
+    public function parseStringExpression()
+    {
+        $stream = $this->parser->getStream();
+
+        $nodes = array();
+        // a string cannot be followed by another string in a single expression
+        $nextCanBeString = true;
+        while (true) {
+            if ($nextCanBeString && $token = $stream->nextIf(Twig_Token::STRING_TYPE)) {
+                $nodes[] = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+                $nextCanBeString = false;
+            } elseif ($stream->nextIf(Twig_Token::INTERPOLATION_START_TYPE)) {
+                $nodes[] = $this->parseExpression();
+                $stream->expect(Twig_Token::INTERPOLATION_END_TYPE);
+                $nextCanBeString = true;
+            } else {
+                break;
+            }
+        }
+
+        $expr = array_shift($nodes);
+        foreach ($nodes as $node) {
+            $expr = new Twig_Node_Expression_Binary_Concat($expr, $node, $node->getTemplateLine());
+        }
+
+        return $expr;
+    }
+
+    public function parseArrayExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
+
+        $node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
+        $first = true;
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+            if (!$first) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    break;
+                }
+            }
+            $first = false;
+
+            $node->addElement($this->parseExpression());
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
+
+        return $node;
+    }
+
+    public function parseHashExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
+
+        $node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
+        $first = true;
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+            if (!$first) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+                    break;
+                }
+            }
+            $first = false;
+
+            // a hash key can be:
+            //
+            //  * a number -- 12
+            //  * a string -- 'a'
+            //  * a name, which is equivalent to a string -- a
+            //  * an expression, which must be enclosed in parentheses -- (1 + 2)
+            if (($token = $stream->nextIf(Twig_Token::STRING_TYPE)) || ($token = $stream->nextIf(Twig_Token::NAME_TYPE)) || $token = $stream->nextIf(Twig_Token::NUMBER_TYPE)) {
+                $key = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+            } elseif ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                $key = $this->parseExpression();
+            } else {
+                $current = $stream->getCurrent();
+
+                throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "%s" of value "%s".', Twig_Token::typeToEnglish($current->getType()), $current->getValue()), $current->getLine(), $stream->getSourceContext());
+            }
+
+            $stream->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
+            $value = $this->parseExpression();
+
+            $node->addElement($value, $key);
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
+
+        return $node;
+    }
+
+    public function parsePostfixExpression($node)
+    {
+        while (true) {
+            $token = $this->parser->getCurrentToken();
+            if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
+                if ('.' == $token->getValue() || '[' == $token->getValue()) {
+                    $node = $this->parseSubscriptExpression($node);
+                } elseif ('|' == $token->getValue()) {
+                    $node = $this->parseFilterExpression($node);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+
+        return $node;
+    }
+
+    public function getFunctionNode($name, $line)
+    {
+        switch ($name) {
+            case 'parent':
+                $this->parseArguments();
+                if (!count($this->parser->getBlockStack())) {
+                    throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden.', $line, $this->parser->getStream()->getSourceContext());
+                }
+
+                if (!$this->parser->getParent() && !$this->parser->hasTraits()) {
+                    throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend nor "use" another template is forbidden.', $line, $this->parser->getStream()->getSourceContext());
+                }
+
+                return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $line);
+            case 'block':
+                $args = $this->parseArguments();
+                if (count($args) < 1) {
+                    throw new Twig_Error_Syntax('The "block" function takes one argument (the block name).', $line, $this->parser->getStream()->getSourceContext());
+                }
+
+                return new Twig_Node_Expression_BlockReference($args->getNode(0), count($args) > 1 ? $args->getNode(1) : null, $line);
+            case 'attribute':
+                $args = $this->parseArguments();
+                if (count($args) < 2) {
+                    throw new Twig_Error_Syntax('The "attribute" function takes at least two arguments (the variable and the attributes).', $line, $this->parser->getStream()->getSourceContext());
+                }
+
+                return new Twig_Node_Expression_GetAttr($args->getNode(0), $args->getNode(1), count($args) > 2 ? $args->getNode(2) : null, Twig_Template::ANY_CALL, $line);
+            default:
+                if (null !== $alias = $this->parser->getImportedSymbol('function', $name)) {
+                    $arguments = new Twig_Node_Expression_Array(array(), $line);
+                    foreach ($this->parseArguments() as $n) {
+                        $arguments->addElement($n);
+                    }
+
+                    $node = new Twig_Node_Expression_MethodCall($alias['node'], $alias['name'], $arguments, $line);
+                    $node->setAttribute('safe', true);
+
+                    return $node;
+                }
+
+                $args = $this->parseArguments(true);
+                $class = $this->getFunctionNodeClass($name, $line);
+
+                return new $class($name, $args, $line);
+        }
+    }
+
+    public function parseSubscriptExpression($node)
+    {
+        $stream = $this->parser->getStream();
+        $token = $stream->next();
+        $lineno = $token->getLine();
+        $arguments = new Twig_Node_Expression_Array(array(), $lineno);
+        $type = Twig_Template::ANY_CALL;
+        if ($token->getValue() == '.') {
+            $token = $stream->next();
+            if (
+                $token->getType() == Twig_Token::NAME_TYPE
+                ||
+                $token->getType() == Twig_Token::NUMBER_TYPE
+                ||
+                ($token->getType() == Twig_Token::OPERATOR_TYPE && preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
+            ) {
+                $arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
+
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                    $type = Twig_Template::METHOD_CALL;
+                    foreach ($this->parseArguments() as $n) {
+                        $arguments->addElement($n);
+                    }
+                }
+            } else {
+                throw new Twig_Error_Syntax('Expected name or number.', $lineno, $stream->getSourceContext());
+            }
+
+            if ($node instanceof Twig_Node_Expression_Name && null !== $this->parser->getImportedSymbol('template', $node->getAttribute('name'))) {
+                if (!$arg instanceof Twig_Node_Expression_Constant) {
+                    throw new Twig_Error_Syntax(sprintf('Dynamic macro names are not supported (called on "%s").', $node->getAttribute('name')), $token->getLine(), $stream->getSourceContext());
+                }
+
+                $name = $arg->getAttribute('value');
+
+                $node = new Twig_Node_Expression_MethodCall($node, 'macro_'.$name, $arguments, $lineno);
+                $node->setAttribute('safe', true);
+
+                return $node;
+            }
+        } else {
+            $type = Twig_Template::ARRAY_CALL;
+
+            // slice?
+            $slice = false;
+            if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $slice = true;
+                $arg = new Twig_Node_Expression_Constant(0, $token->getLine());
+            } else {
+                $arg = $this->parseExpression();
+            }
+
+            if ($stream->nextIf(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $slice = true;
+            }
+
+            if ($slice) {
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    $length = new Twig_Node_Expression_Constant(null, $token->getLine());
+                } else {
+                    $length = $this->parseExpression();
+                }
+
+                $class = $this->getFilterNodeClass('slice', $token->getLine());
+                $arguments = new Twig_Node(array($arg, $length));
+                $filter = new $class($node, new Twig_Node_Expression_Constant('slice', $token->getLine()), $arguments, $token->getLine());
+
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
+
+                return $filter;
+            }
+
+            $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
+        }
+
+        return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
+    }
+
+    public function parseFilterExpression($node)
+    {
+        $this->parser->getStream()->next();
+
+        return $this->parseFilterExpressionRaw($node);
+    }
+
+    public function parseFilterExpressionRaw($node, $tag = null)
+    {
+        while (true) {
+            $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
+
+            $name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                $arguments = new Twig_Node();
+            } else {
+                $arguments = $this->parseArguments(true);
+            }
+
+            $class = $this->getFilterNodeClass($name->getAttribute('value'), $token->getLine());
+
+            $node = new $class($node, $name, $arguments, $token->getLine(), $tag);
+
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
+                break;
+            }
+
+            $this->parser->getStream()->next();
+        }
+
+        return $node;
+    }
+
+    /**
+     * Parses arguments.
+     *
+     * @param bool $namedArguments Whether to allow named arguments or not
+     * @param bool $definition     Whether we are parsing arguments for a function definition
+     *
+     * @return Twig_Node
+     *
+     * @throws Twig_Error_Syntax
+     */
+    public function parseArguments($namedArguments = false, $definition = false)
+    {
+        $args = array();
+        $stream = $this->parser->getStream();
+
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '(', 'A list of arguments must begin with an opening parenthesis');
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
+            if (!empty($args)) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
+            }
+
+            if ($definition) {
+                $token = $stream->expect(Twig_Token::NAME_TYPE, null, 'An argument must be a name');
+                $value = new Twig_Node_Expression_Name($token->getValue(), $this->parser->getCurrentToken()->getLine());
+            } else {
+                $value = $this->parseExpression();
+            }
+
+            $name = null;
+            if ($namedArguments && $token = $stream->nextIf(Twig_Token::OPERATOR_TYPE, '=')) {
+                if (!$value instanceof Twig_Node_Expression_Name) {
+                    throw new Twig_Error_Syntax(sprintf('A parameter name must be a string, "%s" given.', get_class($value)), $token->getLine(), $stream->getSourceContext());
+                }
+                $name = $value->getAttribute('name');
+
+                if ($definition) {
+                    $value = $this->parsePrimaryExpression();
+
+                    if (!$this->checkConstantExpression($value)) {
+                        throw new Twig_Error_Syntax(sprintf('A default value for an argument must be a constant (a boolean, a string, a number, or an array).'), $token->getLine(), $stream->getSourceContext());
+                    }
+                } else {
+                    $value = $this->parseExpression();
+                }
+            }
+
+            if ($definition) {
+                if (null === $name) {
+                    $name = $value->getAttribute('name');
+                    $value = new Twig_Node_Expression_Constant(null, $this->parser->getCurrentToken()->getLine());
+                }
+                $args[$name] = $value;
+            } else {
+                if (null === $name) {
+                    $args[] = $value;
+                } else {
+                    $args[$name] = $value;
+                }
+            }
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
+
+        return new Twig_Node($args);
+    }
+
+    public function parseAssignmentExpression()
+    {
+        $stream = $this->parser->getStream();
+        $targets = array();
+        while (true) {
+            $token = $stream->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
+            $value = $token->getValue();
+            if (in_array(strtolower($value), array('true', 'false', 'none', 'null'))) {
+                throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s".', $value), $token->getLine(), $stream->getSourceContext());
+            }
+            $targets[] = new Twig_Node_Expression_AssignName($value, $token->getLine());
+
+            if (!$stream->nextIf(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+        }
+
+        return new Twig_Node($targets);
+    }
+
+    public function parseMultitargetExpression()
+    {
+        $targets = array();
+        while (true) {
+            $targets[] = $this->parseExpression();
+            if (!$this->parser->getStream()->nextIf(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+        }
+
+        return new Twig_Node($targets);
+    }
+
+    private function parseNotTestExpression(Twig_Node $node)
+    {
+        return new Twig_Node_Expression_Unary_Not($this->parseTestExpression($node), $this->parser->getCurrentToken()->getLine());
+    }
+
+    private function parseTestExpression(Twig_Node $node)
+    {
+        $stream = $this->parser->getStream();
+        list($name, $test) = $this->getTest($node->getTemplateLine());
+
+        $class = $this->getTestNodeClass($test);
+        $arguments = null;
+        if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+            $arguments = $this->parser->getExpressionParser()->parseArguments(true);
+        }
+
+        return new $class($node, $name, $arguments, $this->parser->getCurrentToken()->getLine());
+    }
+
+    private function getTest($line)
+    {
+        $stream = $this->parser->getStream();
+        $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+
+        if ($test = $this->env->getTest($name)) {
+            return array($name, $test);
+        }
+
+        if ($stream->test(Twig_Token::NAME_TYPE)) {
+            // try 2-words tests
+            $name = $name.' '.$this->parser->getCurrentToken()->getValue();
+
+            if ($test = $this->env->getTest($name)) {
+                $stream->next();
+
+                return array($name, $test);
+            }
+        }
+
+        $e = new Twig_Error_Syntax(sprintf('Unknown "%s" test.', $name), $line, $stream->getSourceContext());
+        $e->addSuggestions($name, array_keys($this->env->getTests()));
+
+        throw $e;
+    }
+
+    private function getTestNodeClass($test)
+    {
+        if ($test->isDeprecated()) {
+            $stream = $this->parser->getStream();
+            $message = sprintf('Twig Test "%s" is deprecated', $test->getName());
+
+            if (!is_bool($test->getDeprecatedVersion())) {
+                $message .= sprintf(' since version %s', $test->getDeprecatedVersion());
+            }
+            if ($test->getAlternative()) {
+                $message .= sprintf('. Use "%s" instead', $test->getAlternative());
+            }
+            $src = $stream->getSourceContext();
+            $message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $stream->getCurrent()->getLine());
+
+            @trigger_error($message, E_USER_DEPRECATED);
+        }
+
+        return $test->getNodeClass();
+    }
+
+    private function getFunctionNodeClass($name, $line)
+    {
+        if (false === $function = $this->env->getFunction($name)) {
+            $e = new Twig_Error_Syntax(sprintf('Unknown "%s" function.', $name), $line, $this->parser->getStream()->getSourceContext());
+            $e->addSuggestions($name, array_keys($this->env->getFunctions()));
+
+            throw $e;
+        }
+
+        if ($function->isDeprecated()) {
+            $message = sprintf('Twig Function "%s" is deprecated', $function->getName());
+            if (!is_bool($function->getDeprecatedVersion())) {
+                $message .= sprintf(' since version %s', $function->getDeprecatedVersion());
+            }
+            if ($function->getAlternative()) {
+                $message .= sprintf('. Use "%s" instead', $function->getAlternative());
+            }
+            $src = $this->parser->getStream()->getSourceContext();
+            $message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $line);
+
+            @trigger_error($message, E_USER_DEPRECATED);
+        }
+
+        return $function->getNodeClass();
+    }
+
+    private function getFilterNodeClass($name, $line)
+    {
+        if (false === $filter = $this->env->getFilter($name)) {
+            $e = new Twig_Error_Syntax(sprintf('Unknown "%s" filter.', $name), $line, $this->parser->getStream()->getSourceContext());
+            $e->addSuggestions($name, array_keys($this->env->getFilters()));
+
+            throw $e;
+        }
+
+        if ($filter->isDeprecated()) {
+            $message = sprintf('Twig Filter "%s" is deprecated', $filter->getName());
+            if (!is_bool($filter->getDeprecatedVersion())) {
+                $message .= sprintf(' since version %s', $filter->getDeprecatedVersion());
+            }
+            if ($filter->getAlternative()) {
+                $message .= sprintf('. Use "%s" instead', $filter->getAlternative());
+            }
+            $src = $this->parser->getStream()->getSourceContext();
+            $message .= sprintf(' in %s at line %d.', $src->getPath() ?: $src->getName(), $line);
+
+            @trigger_error($message, E_USER_DEPRECATED);
+        }
+
+        return $filter->getNodeClass();
+    }
+
+    // checks that the node only contains "constant" elements
+    private function checkConstantExpression(Twig_Node $node)
+    {
+        if (!($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array
+            || $node instanceof Twig_Node_Expression_Unary_Neg || $node instanceof Twig_Node_Expression_Unary_Pos
+        )) {
+            return false;
+        }
+
+        foreach ($node as $n) {
+            if (!$this->checkConstantExpression($n)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}

lib/Twig/Extension.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Extension implements Twig_ExtensionInterface
+{
+    public function getTokenParsers()
+    {
+        return array();
+    }
+
+    public function getNodeVisitors()
+    {
+        return array();
+    }
+
+    public function getFilters()
+    {
+        return array();
+    }
+
+    public function getTests()
+    {
+        return array();
+    }
+
+    public function getFunctions()
+    {
+        return array();
+    }
+
+    public function getOperators()
+    {
+        return array();
+    }
+}

lib/Twig/Extension/Debug.php

@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+final class Twig_Extension_Debug extends Twig_Extension
+{
+    public function getFunctions()
+    {
+        // dump is safe if var_dump is overridden by xdebug
+        $isDumpOutputHtmlSafe = extension_loaded('xdebug')
+            // false means that it was not set (and the default is on) or it explicitly enabled
+            && (false === ini_get('xdebug.overload_var_dump') || ini_get('xdebug.overload_var_dump'))
+            // false means that it was not set (and the default is on) or it explicitly enabled
+            // xdebug.overload_var_dump produces HTML only when html_errors is also enabled
+            && (false === ini_get('html_errors') || ini_get('html_errors'))
+            || 'cli' === php_sapi_name()
+        ;
+
+        return array(
+            new Twig_Function('dump', 'twig_var_dump', array('is_safe' => $isDumpOutputHtmlSafe ? array('html') : array(), 'needs_context' => true, 'needs_environment' => true)),
+        );
+    }
+}
+
+function twig_var_dump(Twig_Environment $env, $context, ...$vars)
+{
+    if (!$env->isDebug()) {
+        return;
+    }
+
+    ob_start();
+
+    if (!$vars) {
+        $vars = array();
+        foreach ($context as $key => $value) {
+            if (!$value instanceof Twig_Template) {
+                $vars[$key] = $value;
+            }
+        }
+
+        var_dump($vars);
+    } else {
+        var_dump(...$vars);
+    }
+
+    return ob_get_clean();
+}

lib/Twig/Extension/Escaper.php

@@ -0,0 +1,89 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+final class Twig_Extension_Escaper extends Twig_Extension
+{
+    private $defaultStrategy;
+
+    /**
+     * @param string|false|callable $defaultStrategy An escaping strategy
+     *
+     * @see setDefaultStrategy()
+     */
+    public function __construct($defaultStrategy = 'html')
+    {
+        $this->setDefaultStrategy($defaultStrategy);
+    }
+
+    public function getTokenParsers()
+    {
+        return array(new Twig_TokenParser_AutoEscape());
+    }
+
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Escaper());
+    }
+
+    public function getFilters()
+    {
+        return array(
+            new Twig_Filter('raw', 'twig_raw_filter', array('is_safe' => array('all'))),
+        );
+    }
+
+    /**
+     * Sets the default strategy to use when not defined by the user.
+     *
+     * The strategy can be a valid PHP callback that takes the template
+     * name as an argument and returns the strategy to use.
+     *
+     * @param string|false|callable $defaultStrategy An escaping strategy
+     */
+    public function setDefaultStrategy($defaultStrategy)
+    {
+        if ('name' === $defaultStrategy) {
+            $defaultStrategy = array('Twig_FileExtensionEscapingStrategy', 'guess');
+        }
+
+        $this->defaultStrategy = $defaultStrategy;
+    }
+
+    /**
+     * Gets the default strategy to use when not defined by the user.
+     *
+     * @param string $name The template name
+     *
+     * @return string|false The default strategy to use for the template
+     */
+    public function getDefaultStrategy($name)
+    {
+        // disable string callables to avoid calling a function named html or js,
+        // or any other upcoming escaping strategy
+        if (!is_string($this->defaultStrategy) && false !== $this->defaultStrategy) {
+            return call_user_func($this->defaultStrategy, $name);
+        }
+
+        return $this->defaultStrategy;
+    }
+}
+
+/**
+ * Marks a variable as being safe.
+ *
+ * @param string $string A PHP variable
+ *
+ * @return string
+ */
+function twig_raw_filter($string)
+{
+    return $string;
+}

lib/Twig/Extension/GlobalsInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Enables usage of the deprecated Twig_Extension::getGlobals() method.
+ *
+ * Explicitly implement this interface if you really need to implement the
+ * deprecated getGlobals() method in your extensions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_Extension_GlobalsInterface
+{
+    /**
+     * Returns a list of global variables to add to the existing list.
+     *
+     * @return array An array of global variables
+     */
+    public function getGlobals();
+}

lib/Twig/Extension/InitRuntimeInterface.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Enables usage of the deprecated Twig_Extension::initRuntime() method.
+ *
+ * Explicitly implement this interface if you really need to implement the
+ * deprecated initRuntime() method in your extensions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_Extension_InitRuntimeInterface
+{
+    /**
+     * Initializes the runtime environment.
+     *
+     * This is where you can load some file that contains filter functions for instance.
+     *
+     * @param Twig_Environment $environment The current Twig_Environment instance
+     */
+    public function initRuntime(Twig_Environment $environment);
+}

lib/Twig/Extension/Optimizer.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+final class Twig_Extension_Optimizer extends Twig_Extension
+{
+    private $optimizers;
+
+    public function __construct($optimizers = -1)
+    {
+        $this->optimizers = $optimizers;
+    }
+
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Optimizer($this->optimizers));
+    }
+}

lib/Twig/Extension/Profiler.php

@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class Twig_Extension_Profiler extends Twig_Extension
+{
+    private $actives = array();
+
+    public function __construct(Twig_Profiler_Profile $profile)
+    {
+        $this->actives[] = $profile;
+    }
+
+    public function enter(Twig_Profiler_Profile $profile)
+    {
+        $this->actives[0]->addProfile($profile);
+        array_unshift($this->actives, $profile);
+    }
+
+    public function leave(Twig_Profiler_Profile $profile)
+    {
+        $profile->leave();
+        array_shift($this->actives);
+
+        if (1 === count($this->actives)) {
+            $this->actives[0]->leave();
+        }
+    }
+
+    public function getNodeVisitors()
+    {
+        return array(new Twig_Profiler_NodeVisitor_Profiler(get_class($this)));
+    }
+}

lib/Twig/Extension/Sandbox.php

@@ -0,0 +1,93 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+final class Twig_Extension_Sandbox extends Twig_Extension
+{
+    private $sandboxedGlobally;
+    private $sandboxed;
+    private $policy;
+
+    public function __construct(Twig_Sandbox_SecurityPolicyInterface $policy, $sandboxed = false)
+    {
+        $this->policy = $policy;
+        $this->sandboxedGlobally = $sandboxed;
+    }
+
+    public function getTokenParsers()
+    {
+        return array(new Twig_TokenParser_Sandbox());
+    }
+
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Sandbox());
+    }
+
+    public function enableSandbox()
+    {
+        $this->sandboxed = true;
+    }
+
+    public function disableSandbox()
+    {
+        $this->sandboxed = false;
+    }
+
+    public function isSandboxed()
+    {
+        return $this->sandboxedGlobally || $this->sandboxed;
+    }
+
+    public function isSandboxedGlobally()
+    {
+        return $this->sandboxedGlobally;
+    }
+
+    public function setSecurityPolicy(Twig_Sandbox_SecurityPolicyInterface $policy)
+    {
+        $this->policy = $policy;
+    }
+
+    public function getSecurityPolicy()
+    {
+        return $this->policy;
+    }
+
+    public function checkSecurity($tags, $filters, $functions)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkSecurity($tags, $filters, $functions);
+        }
+    }
+
+    public function checkMethodAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkMethodAllowed($obj, $method);
+        }
+    }
+
+    public function checkPropertyAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkPropertyAllowed($obj, $method);
+        }
+    }
+
+    public function ensureToStringAllowed($obj)
+    {
+        if ($this->isSandboxed() && is_object($obj)) {
+            $this->policy->checkMethodAllowed($obj, '__toString');
+        }
+
+        return $obj;
+    }
+}

lib/Twig/Extension/Staging.php

@@ -0,0 +1,92 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Used by Twig_Environment as a staging area.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+final class Twig_Extension_Staging extends Twig_Extension
+{
+    private $functions = array();
+    private $filters = array();
+    private $visitors = array();
+    private $tokenParsers = array();
+    private $tests = array();
+
+    public function addFunction(Twig_Function $function)
+    {
+        if (isset($this->functions[$function->getName()])) {
+            throw new LogicException(sprintf('Function "%s" is already registered.', $function->getName()));
+        }
+
+        $this->functions[$function->getName()] = $function;
+    }
+
+    public function getFunctions()
+    {
+        return $this->functions;
+    }
+
+    public function addFilter(Twig_Filter $filter)
+    {
+        if (isset($this->filters[$filter->getName()])) {
+            throw new LogicException(sprintf('Filter "%s" is already registered.', $filter->getName()));
+        }
+
+        $this->filters[$filter->getName()] = $filter;
+    }
+
+    public function getFilters()
+    {
+        return $this->filters;
+    }
+
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        $this->visitors[] = $visitor;
+    }
+
+    public function getNodeVisitors()
+    {
+        return $this->visitors;
+    }
+
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        if (isset($this->tokenParsers[$parser->getTag()])) {
+            throw new LogicException(sprintf('Tag "%s" is already registered.', $parser->getTag()));
+        }
+
+        $this->tokenParsers[$parser->getTag()] = $parser;
+    }
+
+    public function getTokenParsers()
+    {
+        return $this->tokenParsers;
+    }
+
+    public function addTest(Twig_Test $test)
+    {
+        if (isset($this->tests[$test->getName()])) {
+            throw new LogicException(sprintf('Test "%s" is already registered.', $test->getTag()));
+        }
+
+        $this->tests[$test->getName()] = $test;
+    }
+
+    public function getTests()
+    {
+        return $this->tests;
+    }
+}

lib/Twig/Extension/StringLoader.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+final class Twig_Extension_StringLoader extends Twig_Extension
+{
+    public function getFunctions()
+    {
+        return array(
+            new Twig_Function('template_from_string', 'twig_template_from_string', array('needs_environment' => true)),
+        );
+    }
+}
+
+/**
+ * Loads a template from a string.
+ *
+ * <pre>
+ * {{ include(template_from_string("Hello {{ name }}")) }}
+ * </pre>
+ *
+ * @param Twig_Environment $env      A Twig_Environment instance
+ * @param string           $template A template as a string or object implementing __toString()
+ *
+ * @return Twig_Template
+ */
+function twig_template_from_string(Twig_Environment $env, $template)
+{
+    return $env->createTemplate((string) $template);
+}

lib/Twig/ExtensionInterface.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by extension classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_ExtensionInterface
+{
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return Twig_TokenParserInterface[]
+     */
+    public function getTokenParsers();
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return Twig_NodeVisitorInterface[]
+     */
+    public function getNodeVisitors();
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return Twig_Filter[]
+     */
+    public function getFilters();
+
+    /**
+     * Returns a list of tests to add to the existing list.
+     *
+     * @return Twig_Test[]
+     */
+    public function getTests();
+
+    /**
+     * Returns a list of functions to add to the existing list.
+     *
+     * @return Twig_Function[]
+     */
+    public function getFunctions();
+
+    /**
+     * Returns a list of operators to add to the existing list.
+     *
+     * @return array<array> First array of unary operators, second array of binary operators
+     */
+    public function getOperators();
+}

lib/Twig/ExtensionSet.php

@@ -0,0 +1,470 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+final class Twig_ExtensionSet
+{
+    private $extensions;
+    private $initialized = false;
+    private $runtimeInitialized = false;
+    private $staging;
+    private $parsers;
+    private $visitors;
+    private $filters;
+    private $tests;
+    private $functions;
+    private $unaryOperators;
+    private $binaryOperators;
+    private $globals;
+    private $functionCallbacks = array();
+    private $filterCallbacks = array();
+    private $lastModified = 0;
+
+    public function __construct()
+    {
+        $this->staging = new Twig_Extension_Staging();
+    }
+
+    /**
+     * Initializes the runtime environment.
+     */
+    public function initRuntime(Twig_Environment $env)
+    {
+        if ($this->runtimeInitialized) {
+            return;
+        }
+
+        $this->runtimeInitialized = true;
+
+        foreach ($this->extensions as $extension) {
+            if ($extension instanceof Twig_Extension_InitRuntimeInterface) {
+                $extension->initRuntime($env);
+            }
+        }
+    }
+
+    /**
+     * Returns true if the given extension is registered.
+     *
+     * @param string $class The extension class name
+     *
+     * @return bool Whether the extension is registered or not
+     */
+    public function hasExtension($class)
+    {
+        return isset($this->extensions[ltrim($class, '\\')]);
+    }
+
+    /**
+     * Gets an extension by class name.
+     *
+     * @param string $class The extension class name
+     *
+     * @return Twig_ExtensionInterface A Twig_ExtensionInterface instance
+     */
+    public function getExtension($class)
+    {
+        $class = ltrim($class, '\\');
+
+        if (!isset($this->extensions[$class])) {
+            throw new Twig_Error_Runtime(sprintf('The "%s" extension is not enabled.', $class));
+        }
+
+        return $this->extensions[$class];
+    }
+
+    /**
+     * Registers an array of extensions.
+     *
+     * @param array $extensions An array of extensions
+     */
+    public function setExtensions(array $extensions)
+    {
+        foreach ($extensions as $extension) {
+            $this->addExtension($extension);
+        }
+    }
+
+    /**
+     * Returns all registered extensions.
+     *
+     * @return array An array of extensions
+     */
+    public function getExtensions()
+    {
+        return $this->extensions;
+    }
+
+    public function getSignature()
+    {
+        return json_encode(array_keys($this->extensions));
+    }
+
+    public function isInitialized()
+    {
+        return $this->initialized || $this->runtimeInitialized;
+    }
+
+    public function getLastModified()
+    {
+        if (0 !== $this->lastModified) {
+            return $this->lastModified;
+        }
+
+        foreach ($this->extensions as $extension) {
+            $r = new ReflectionObject($extension);
+            if (file_exists($r->getFileName()) && ($extensionTime = filemtime($r->getFileName())) > $this->lastModified) {
+                $this->lastModified = $extensionTime;
+            }
+        }
+
+        return $this->lastModified;
+    }
+
+    /**
+     * Registers an extension.
+     *
+     * @param Twig_ExtensionInterface $extension A Twig_ExtensionInterface instance
+     */
+    public function addExtension(Twig_ExtensionInterface $extension)
+    {
+        $class = get_class($extension);
+
+        if ($this->initialized) {
+            throw new LogicException(sprintf('Unable to register extension "%s" as extensions have already been initialized.', $class));
+        }
+
+        if (isset($this->extensions[$class])) {
+            throw new LogicException(sprintf('Unable to register extension "%s" as it is already registered.', $class));
+        }
+
+        $this->extensions[$class] = $extension;
+    }
+
+    public function addFunction(Twig_Function $function)
+    {
+        if ($this->initialized) {
+            throw new LogicException(sprintf('Unable to add function "%s" as extensions have already been initialized.', $function->getName()));
+        }
+
+        $this->staging->addFunction($function);
+    }
+
+    public function getFunctions()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->functions;
+    }
+
+    /**
+     * Get a function by name.
+     *
+     * @param string $name function name
+     *
+     * @return Twig_Function|false A Twig_Function instance or false if the function does not exist
+     */
+    public function getFunction($name)
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->functions[$name])) {
+            return $this->functions[$name];
+        }
+
+        foreach ($this->functions as $pattern => $function) {
+            $pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
+
+            if ($count && preg_match('#^'.$pattern.'$#', $name, $matches)) {
+                array_shift($matches);
+                $function->setArguments($matches);
+
+                return $function;
+            }
+        }
+
+        foreach ($this->functionCallbacks as $callback) {
+            if (false !== $function = $callback($name)) {
+                return $function;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFunctionCallback(callable $callable)
+    {
+        $this->functionCallbacks[] = $callable;
+    }
+
+    public function addFilter(Twig_Filter $filter)
+    {
+        if ($this->initialized) {
+            throw new LogicException(sprintf('Unable to add filter "%s" as extensions have already been initialized.', $filter->getName()));
+        }
+
+        $this->staging->addFilter($filter);
+    }
+
+    public function getFilters()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->filters;
+    }
+
+    /**
+     * Get a filter by name.
+     *
+     * Subclasses may override this method and load filters differently;
+     * so no list of filters is available.
+     *
+     * @param string $name The filter name
+     *
+     * @return Twig_Filter|false A Twig_Filter instance or false if the filter does not exist
+     */
+    public function getFilter($name)
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->filters[$name])) {
+            return $this->filters[$name];
+        }
+
+        foreach ($this->filters as $pattern => $filter) {
+            $pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
+
+            if ($count && preg_match('#^'.$pattern.'$#', $name, $matches)) {
+                array_shift($matches);
+                $filter->setArguments($matches);
+
+                return $filter;
+            }
+        }
+
+        foreach ($this->filterCallbacks as $callback) {
+            if (false !== $filter = $callback($name)) {
+                return $filter;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFilterCallback(callable $callable)
+    {
+        $this->filterCallbacks[] = $callable;
+    }
+
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        if ($this->initialized) {
+            throw new LogicException('Unable to add a node visitor as extensions have already been initialized.');
+        }
+
+        $this->staging->addNodeVisitor($visitor);
+    }
+
+    public function getNodeVisitors()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->visitors;
+    }
+
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        if ($this->initialized) {
+            throw new LogicException('Unable to add a token parser as extensions have already been initialized.');
+        }
+
+        $this->staging->addTokenParser($parser);
+    }
+
+    public function getTokenParsers()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->parsers;
+    }
+
+    public function getGlobals()
+    {
+        if (null !== $this->globals) {
+            return $this->globals;
+        }
+
+        $globals = array();
+        foreach ($this->extensions as $extension) {
+            if (!$extension instanceof Twig_Extension_GlobalsInterface) {
+                continue;
+            }
+
+            $extGlobals = $extension->getGlobals();
+            if (!is_array($extGlobals)) {
+                throw new UnexpectedValueException(sprintf('"%s::getGlobals()" must return an array of globals.', get_class($extension)));
+            }
+
+            $globals = array_merge($globals, $extGlobals);
+        }
+
+        if ($this->initialized) {
+            $this->globals = $globals;
+        }
+
+        return $globals;
+    }
+
+    public function addTest(Twig_Test $test)
+    {
+        if ($this->initialized) {
+            throw new LogicException(sprintf('Unable to add test "%s" as extensions have already been initialized.', $test->getName()));
+        }
+
+        $this->staging->addTest($test);
+    }
+
+    public function getTests()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->tests;
+    }
+
+    /**
+     * Gets a test by name.
+     *
+     * @param string $name The test name
+     *
+     * @return Twig_Test|false A Twig_Test instance or false if the test does not exist
+     */
+    public function getTest($name)
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->tests[$name])) {
+            return $this->tests[$name];
+        }
+
+        return false;
+    }
+
+    /**
+     * Gets the registered unary Operators.
+     *
+     * @return array An array of unary operators
+     */
+    public function getUnaryOperators()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->unaryOperators;
+    }
+
+    /**
+     * Gets the registered binary Operators.
+     *
+     * @return array An array of binary operators
+     */
+    public function getBinaryOperators()
+    {
+        if (!$this->initialized) {
+            $this->initExtensions();
+        }
+
+        return $this->binaryOperators;
+    }
+
+    private function initExtensions()
+    {
+        $this->initialized = true;
+        $this->parsers = array();
+        $this->filters = array();
+        $this->functions = array();
+        $this->tests = array();
+        $this->visitors = array();
+        $this->unaryOperators = array();
+        $this->binaryOperators = array();
+
+        foreach ($this->extensions as $extension) {
+            $this->initExtension($extension);
+        }
+        $this->initExtension($this->staging);
+    }
+
+    private function initExtension(Twig_ExtensionInterface $extension)
+    {
+        // filters
+        foreach ($extension->getFilters() as $filter) {
+            $this->filters[$filter->getName()] = $filter;
+        }
+
+        // functions
+        foreach ($extension->getFunctions() as $function) {
+            $this->functions[$function->getName()] = $function;
+        }
+
+        // tests
+        foreach ($extension->getTests() as $test) {
+            $this->tests[$test->getName()] = $test;
+        }
+
+        // token parsers
+        foreach ($extension->getTokenParsers() as $parser) {
+            if (!$parser instanceof Twig_TokenParserInterface) {
+                throw new LogicException('getTokenParsers() must return an array of Twig_TokenParserInterface.');
+            }
+
+            $this->parsers[] = $parser;
+        }
+
+        // node visitors
+        foreach ($extension->getNodeVisitors() as $visitor) {
+            $this->visitors[] = $visitor;
+        }
+
+        // operators
+        if ($operators = $extension->getOperators()) {
+            if (!is_array($operators)) {
+                throw new InvalidArgumentException(sprintf('"%s::getOperators()" must return an array with operators, got "%s".', get_class($extension), is_object($operators) ? get_class($operators) : gettype($operators).(is_resource($operators) ? '' : '#'.$operators)));
+            }
+
+            if (2 !== count($operators)) {
+                throw new InvalidArgumentException(sprintf('"%s::getOperators()" must return an array of 2 elements, got %d.', get_class($extension), count($operators)));
+            }
+
+            $this->unaryOperators = array_merge($this->unaryOperators, $operators[0]);
+            $this->binaryOperators = array_merge($this->binaryOperators, $operators[1]);
+        }
+    }
+}

lib/Twig/FactoryRuntimeLoader.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Lazy loads the runtime implementations for a Twig element.
+ *
+ * @author Robin Chalas <robin.chalas@gmail.com>
+ */
+class Twig_FactoryRuntimeLoader implements Twig_RuntimeLoaderInterface
+{
+    private $map;
+
+    /**
+     * @param array $map An array where keys are class names and values factory callables
+     */
+    public function __construct($map = array())
+    {
+        $this->map = $map;
+    }
+
+    public function load($class)
+    {
+        if (isset($this->map[$class])) {
+            $runtimeFactory = $this->map[$class];
+
+            return $runtimeFactory();
+        }
+    }
+}

lib/Twig/FileExtensionEscapingStrategy.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Default autoescaping strategy based on file names.
+ *
+ * This strategy sets the HTML as the default autoescaping strategy,
+ * but changes it based on the template name.
+ *
+ * Note that there is no runtime performance impact as the
+ * default autoescaping strategy is set at compilation time.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_FileExtensionEscapingStrategy
+{
+    /**
+     * Guesses the best autoescaping strategy based on the file name.
+     *
+     * @param string $name The template name
+     *
+     * @return string|false The escaping strategy name to use or false to disable
+     */
+    public static function guess($name)
+    {
+        if (in_array(substr($name, -1), array('/', '\\'))) {
+            return 'html'; // return html for directories
+        }
+
+        if ('.twig' === substr($name, -5)) {
+            $name = substr($name, 0, -5);
+        }
+
+        $extension = pathinfo($name, PATHINFO_EXTENSION);
+
+        switch ($extension) {
+            case 'js':
+                return 'js';
+
+            case 'css':
+                return 'css';
+
+            case 'txt':
+                return false;
+
+            default:
+                return 'html';
+        }
+    }
+}

lib/Twig/Filter.php

@@ -0,0 +1,133 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009-2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template filter.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see http://twig.sensiolabs.org/doc/templates.html#filters
+ */
+class Twig_Filter
+{
+    private $name;
+    private $callable;
+    private $options;
+    private $arguments = array();
+
+    /**
+     * Creates a template filter.
+     *
+     * @param string        $name     Name of this filter
+     * @param callable|null $callable A callable implementing the filter. If null, you need to overwrite the "node_class" option to customize compilation.
+     * @param array         $options  Options array
+     */
+    public function __construct($name, $callable = null, array $options = array())
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context' => false,
+            'is_variadic' => false,
+            'is_safe' => null,
+            'is_safe_callback' => null,
+            'pre_escape' => null,
+            'preserves_safety' => null,
+            'node_class' => 'Twig_Node_Expression_Filter',
+            'deprecated' => false,
+            'alternative' => null,
+        ), $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Returns the callable to execute for this filter.
+     *
+     * @return callable|null
+     */
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $filterArgs)
+    {
+        if (null !== $this->options['is_safe']) {
+            return $this->options['is_safe'];
+        }
+
+        if (null !== $this->options['is_safe_callback']) {
+            return $this->options['is_safe_callback']($filterArgs);
+        }
+    }
+
+    public function getPreservesSafety()
+    {
+        return $this->options['preserves_safety'];
+    }
+
+    public function getPreEscape()
+    {
+        return $this->options['pre_escape'];
+    }
+
+    public function isVariadic()
+    {
+        return $this->options['is_variadic'];
+    }
+
+    public function isDeprecated()
+    {
+        return (bool) $this->options['deprecated'];
+    }
+
+    public function getDeprecatedVersion()
+    {
+        return $this->options['deprecated'];
+    }
+
+    public function getAlternative()
+    {
+        return $this->options['alternative'];
+    }
+}

lib/Twig/Function.php

@@ -0,0 +1,123 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010-2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see http://twig.sensiolabs.org/doc/templates.html#functions
+ */
+class Twig_Function
+{
+    private $name;
+    private $callable;
+    private $options;
+    private $arguments = array();
+
+    /**
+     * Creates a template function.
+     *
+     * @param string        $name     Name of this function
+     * @param callable|null $callable A callable implementing the function. If null, you need to overwrite the "node_class" option to customize compilation.
+     * @param array         $options  Options array
+     */
+    public function __construct($name, $callable = null, array $options = array())
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context' => false,
+            'is_variadic' => false,
+            'is_safe' => null,
+            'is_safe_callback' => null,
+            'node_class' => 'Twig_Node_Expression_Function',
+            'deprecated' => false,
+            'alternative' => null,
+        ), $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Returns the callable to execute for this function.
+     *
+     * @return callable|null
+     */
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $functionArgs)
+    {
+        if (null !== $this->options['is_safe']) {
+            return $this->options['is_safe'];
+        }
+
+        if (null !== $this->options['is_safe_callback']) {
+            return $this->options['is_safe_callback']($functionArgs);
+        }
+
+        return array();
+    }
+
+    public function isVariadic()
+    {
+        return $this->options['is_variadic'];
+    }
+
+    public function isDeprecated()
+    {
+        return (bool) $this->options['deprecated'];
+    }
+
+    public function getDeprecatedVersion()
+    {
+        return $this->options['deprecated'];
+    }
+
+    public function getAlternative()
+    {
+        return $this->options['alternative'];
+    }
+}

lib/Twig/Lexer.php

@@ -0,0 +1,393 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Lexes a template string.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Lexer
+{
+    private $tokens;
+    private $code;
+    private $cursor;
+    private $lineno;
+    private $end;
+    private $state;
+    private $states;
+    private $brackets;
+    private $env;
+    private $source;
+    private $options;
+    private $regexes;
+    private $position;
+    private $positions;
+    private $currentVarBlockLine;
+
+    const STATE_DATA = 0;
+    const STATE_BLOCK = 1;
+    const STATE_VAR = 2;
+    const STATE_STRING = 3;
+    const STATE_INTERPOLATION = 4;
+
+    const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
+    const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A';
+    const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
+    const REGEX_DQ_STRING_DELIM = '/"/A';
+    const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As';
+    const PUNCTUATION = '()[]{}?:.,|';
+
+    public function __construct(Twig_Environment $env, array $options = array())
+    {
+        $this->env = $env;
+
+        $this->options = array_merge(array(
+            'tag_comment' => array('{#', '#}'),
+            'tag_block' => array('{%', '%}'),
+            'tag_variable' => array('{{', '}}'),
+            'whitespace_trim' => '-',
+            'interpolation' => array('#{', '}'),
+        ), $options);
+
+        $this->regexes = array(
+            'lex_var' => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A',
+            'lex_block' => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A',
+            'lex_raw_data' => '/('.preg_quote($this->options['tag_block'][0].$this->options['whitespace_trim'], '/').'|'.preg_quote($this->options['tag_block'][0], '/').')\s*(?:endverbatim)\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/s',
+            'operator' => $this->getOperatorRegex(),
+            'lex_comment' => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s',
+            'lex_block_raw' => '/\s*verbatim\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As',
+            'lex_block_line' => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As',
+            'lex_tokens_start' => '/('.preg_quote($this->options['tag_variable'][0], '/').'|'.preg_quote($this->options['tag_block'][0], '/').'|'.preg_quote($this->options['tag_comment'][0], '/').')('.preg_quote($this->options['whitespace_trim'], '/').')?/s',
+            'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A',
+            'interpolation_end' => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A',
+        );
+    }
+
+    public function tokenize(Twig_Source $source)
+    {
+        $this->source = $source;
+        $this->code = str_replace(array("\r\n", "\r"), "\n", $source->getCode());
+        $this->cursor = 0;
+        $this->lineno = 1;
+        $this->end = strlen($this->code);
+        $this->tokens = array();
+        $this->state = self::STATE_DATA;
+        $this->states = array();
+        $this->brackets = array();
+        $this->position = -1;
+
+        // find all token starts in one go
+        preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE);
+        $this->positions = $matches;
+
+        while ($this->cursor < $this->end) {
+            // dispatch to the lexing functions depending
+            // on the current state
+            switch ($this->state) {
+                case self::STATE_DATA:
+                    $this->lexData();
+                    break;
+
+                case self::STATE_BLOCK:
+                    $this->lexBlock();
+                    break;
+
+                case self::STATE_VAR:
+                    $this->lexVar();
+                    break;
+
+                case self::STATE_STRING:
+                    $this->lexString();
+                    break;
+
+                case self::STATE_INTERPOLATION:
+                    $this->lexInterpolation();
+                    break;
+            }
+        }
+
+        $this->pushToken(Twig_Token::EOF_TYPE);
+
+        if (!empty($this->brackets)) {
+            list($expect, $lineno) = array_pop($this->brackets);
+            throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
+        }
+
+        return new Twig_TokenStream($this->tokens, $this->source);
+    }
+
+    private function lexData()
+    {
+        // if no matches are left we return the rest of the template as simple text token
+        if ($this->position == count($this->positions[0]) - 1) {
+            $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
+            $this->cursor = $this->end;
+
+            return;
+        }
+
+        // Find the first token after the current cursor
+        $position = $this->positions[0][++$this->position];
+        while ($position[1] < $this->cursor) {
+            if ($this->position == count($this->positions[0]) - 1) {
+                return;
+            }
+            $position = $this->positions[0][++$this->position];
+        }
+
+        // push the template text first
+        $text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor);
+        if (isset($this->positions[2][$this->position][0])) {
+            $text = rtrim($text);
+        }
+        $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+        $this->moveCursor($textContent.$position[0]);
+
+        switch ($this->positions[1][$this->position][0]) {
+            case $this->options['tag_comment'][0]:
+                $this->lexComment();
+                break;
+
+            case $this->options['tag_block'][0]:
+                // raw data?
+                if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) {
+                    $this->moveCursor($match[0]);
+                    $this->lexRawData();
+                // {% line \d+ %}
+                } elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) {
+                    $this->moveCursor($match[0]);
+                    $this->lineno = (int) $match[1];
+                } else {
+                    $this->pushToken(Twig_Token::BLOCK_START_TYPE);
+                    $this->pushState(self::STATE_BLOCK);
+                    $this->currentVarBlockLine = $this->lineno;
+                }
+                break;
+
+            case $this->options['tag_variable'][0]:
+                $this->pushToken(Twig_Token::VAR_START_TYPE);
+                $this->pushState(self::STATE_VAR);
+                $this->currentVarBlockLine = $this->lineno;
+                break;
+        }
+    }
+
+    private function lexBlock()
+    {
+        if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::BLOCK_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    private function lexVar()
+    {
+        if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::VAR_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    private function lexExpression()
+    {
+        // whitespace
+        if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) {
+            $this->moveCursor($match[0]);
+
+            if ($this->cursor >= $this->end) {
+                throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->currentVarBlockLine, $this->source);
+            }
+        }
+
+        // operators
+        if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::OPERATOR_TYPE, preg_replace('/\s+/', ' ', $match[0]));
+            $this->moveCursor($match[0]);
+        }
+        // names
+        elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::NAME_TYPE, $match[0]);
+            $this->moveCursor($match[0]);
+        }
+        // numbers
+        elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
+            $number = (float) $match[0];  // floats
+            if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) {
+                $number = (int) $match[0]; // integers lower than the maximum
+            }
+            $this->pushToken(Twig_Token::NUMBER_TYPE, $number);
+            $this->moveCursor($match[0]);
+        }
+        // punctuation
+        elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) {
+            // opening bracket
+            if (false !== strpos('([{', $this->code[$this->cursor])) {
+                $this->brackets[] = array($this->code[$this->cursor], $this->lineno);
+            }
+            // closing bracket
+            elseif (false !== strpos(')]}', $this->code[$this->cursor])) {
+                if (empty($this->brackets)) {
+                    throw new Twig_Error_Syntax(sprintf('Unexpected "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
+                }
+
+                list($expect, $lineno) = array_pop($this->brackets);
+                if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
+                    throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
+                }
+            }
+
+            $this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]);
+            ++$this->cursor;
+        }
+        // strings
+        elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)));
+            $this->moveCursor($match[0]);
+        }
+        // opening double quoted string
+        elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
+            $this->brackets[] = array('"', $this->lineno);
+            $this->pushState(self::STATE_STRING);
+            $this->moveCursor($match[0]);
+        }
+        // unlexable
+        else {
+            throw new Twig_Error_Syntax(sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
+        }
+    }
+
+    private function lexRawData()
+    {
+        if (!preg_match($this->regexes['lex_raw_data'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+            throw new Twig_Error_Syntax('Unexpected end of file: Unclosed "verbatim" block.', $this->lineno, $this->source);
+        }
+
+        $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
+        $this->moveCursor($text.$match[0][0]);
+
+        if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) {
+            $text = rtrim($text);
+        }
+
+        $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+    }
+
+    private function lexComment()
+    {
+        if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+            throw new Twig_Error_Syntax('Unclosed comment.', $this->lineno, $this->source);
+        }
+
+        $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]);
+    }
+
+    private function lexString()
+    {
+        if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) {
+            $this->brackets[] = array($this->options['interpolation'][0], $this->lineno);
+            $this->pushToken(Twig_Token::INTERPOLATION_START_TYPE);
+            $this->moveCursor($match[0]);
+            $this->pushState(self::STATE_INTERPOLATION);
+        } elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) {
+            $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0]));
+            $this->moveCursor($match[0]);
+        } elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
+            list($expect, $lineno) = array_pop($this->brackets);
+            if ($this->code[$this->cursor] != '"') {
+                throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
+            }
+
+            $this->popState();
+            ++$this->cursor;
+        }
+    }
+
+    private function lexInterpolation()
+    {
+        $bracket = end($this->brackets);
+        if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) {
+            array_pop($this->brackets);
+            $this->pushToken(Twig_Token::INTERPOLATION_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    private function pushToken($type, $value = '')
+    {
+        // do not push empty text tokens
+        if (Twig_Token::TEXT_TYPE === $type && '' === $value) {
+            return;
+        }
+
+        $this->tokens[] = new Twig_Token($type, $value, $this->lineno);
+    }
+
+    private function moveCursor($text)
+    {
+        $this->cursor += strlen($text);
+        $this->lineno += substr_count($text, "\n");
+    }
+
+    private function getOperatorRegex()
+    {
+        $operators = array_merge(
+            array('='),
+            array_keys($this->env->getUnaryOperators()),
+            array_keys($this->env->getBinaryOperators())
+        );
+
+        $operators = array_combine($operators, array_map('strlen', $operators));
+        arsort($operators);
+
+        $regex = array();
+        foreach ($operators as $operator => $length) {
+            // an operator that ends with a character must be followed by
+            // a whitespace or a parenthesis
+            if (ctype_alpha($operator[$length - 1])) {
+                $r = preg_quote($operator, '/').'(?=[\s()])';
+            } else {
+                $r = preg_quote($operator, '/');
+            }
+
+            // an operator with a space can be any amount of whitespaces
+            $r = preg_replace('/\s+/', '\s+', $r);
+
+            $regex[] = $r;
+        }
+
+        return '/'.implode('|', $regex).'/A';
+    }
+
+    private function pushState($state)
+    {
+        $this->states[] = $this->state;
+        $this->state = $state;
+    }
+
+    private function popState()
+    {
+        if (0 === count($this->states)) {
+            throw new LogicException('Cannot pop state without a previous state.');
+        }
+
+        $this->state = array_pop($this->states);
+    }
+}

lib/Twig/Loader/Array.php

@@ -0,0 +1,79 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads a template from an array.
+ *
+ * When using this loader with a cache mechanism, you should know that a new cache
+ * key is generated each time a template content "changes" (the cache key being the
+ * source code of the template). If you don't want to see your cache grows out of
+ * control, you need to take care of clearing the old cache file by yourself.
+ *
+ * This loader should only be used for unit testing.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class Twig_Loader_Array implements Twig_LoaderInterface, Twig_ExistsLoaderInterface, Twig_SourceContextLoaderInterface
+{
+    private $templates = array();
+
+    /**
+     * @param array $templates An array of templates (keys are the names, and values are the source code)
+     */
+    public function __construct(array $templates = array())
+    {
+        $this->templates = $templates;
+    }
+
+    /**
+     * Adds or overrides a template.
+     *
+     * @param string $name     The template name
+     * @param string $template The template source
+     */
+    public function setTemplate($name, $template)
+    {
+        $this->templates[$name] = $template;
+    }
+
+    public function getSourceContext($name)
+    {
+        $name = (string) $name;
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return new Twig_Source($this->templates[$name], $name);
+    }
+
+    public function exists($name)
+    {
+        return isset($this->templates[$name]);
+    }
+
+    public function getCacheKey($name)
+    {
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return $this->templates[$name];
+    }
+
+    public function isFresh($name, $time)
+    {
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return true;
+    }
+}

lib/Twig/Loader/Chain.php

@@ -0,0 +1,106 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads templates from other loaders.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class Twig_Loader_Chain implements Twig_LoaderInterface, Twig_ExistsLoaderInterface, Twig_SourceContextLoaderInterface
+{
+    private $hasSourceCache = array();
+    private $loaders = array();
+
+    /**
+     * @param Twig_LoaderInterface[] $loaders
+     */
+    public function __construct(array $loaders = array())
+    {
+        foreach ($loaders as $loader) {
+            $this->addLoader($loader);
+        }
+    }
+
+    public function addLoader(Twig_LoaderInterface $loader)
+    {
+        $this->loaders[] = $loader;
+        $this->hasSourceCache = array();
+    }
+
+    public function getSourceContext($name)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if (!$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->getSourceContext($name);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = $e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+    }
+
+    public function exists($name)
+    {
+        if (isset($this->hasSourceCache[$name])) {
+            return $this->hasSourceCache[$name];
+        }
+
+        foreach ($this->loaders as $loader) {
+            if ($loader->exists($name)) {
+                return $this->hasSourceCache[$name] = true;
+            }
+        }
+
+        return $this->hasSourceCache[$name] = false;
+    }
+
+    public function getCacheKey($name)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if (!$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->getCacheKey($name);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = get_class($loader).': '.$e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+    }
+
+    public function isFresh($name, $time)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if (!$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->isFresh($name, $time);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = get_class($loader).': '.$e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+    }
+}

lib/Twig/Loader/Filesystem.php

@@ -0,0 +1,282 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads template from the filesystem.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_Filesystem implements Twig_LoaderInterface, Twig_ExistsLoaderInterface, Twig_SourceContextLoaderInterface
+{
+    /** Identifier of the main namespace. */
+    const MAIN_NAMESPACE = '__main__';
+
+    protected $paths = array();
+    protected $cache = array();
+    protected $errorCache = array();
+
+    private $rootPath;
+
+    /**
+     * @param string|array $paths    A path or an array of paths where to look for templates
+     * @param string|null  $rootPath The root path common to all relative paths (null for getcwd())
+     */
+    public function __construct($paths = array(), $rootPath = null)
+    {
+        $this->rootPath = (null === $rootPath ? getcwd() : $rootPath).DIRECTORY_SEPARATOR;
+        if (false !== $realPath = realpath($rootPath)) {
+            $this->rootPath = $realPath.DIRECTORY_SEPARATOR;
+        }
+
+        if ($paths) {
+            $this->setPaths($paths);
+        }
+    }
+
+    /**
+     * Returns the paths to the templates.
+     *
+     * @param string $namespace A path namespace
+     *
+     * @return array The array of paths where to look for templates
+     */
+    public function getPaths($namespace = self::MAIN_NAMESPACE)
+    {
+        return isset($this->paths[$namespace]) ? $this->paths[$namespace] : array();
+    }
+
+    /**
+     * Returns the path namespaces.
+     *
+     * The main namespace is always defined.
+     *
+     * @return array The array of defined namespaces
+     */
+    public function getNamespaces()
+    {
+        return array_keys($this->paths);
+    }
+
+    /**
+     * Sets the paths where templates are stored.
+     *
+     * @param string|array $paths     A path or an array of paths where to look for templates
+     * @param string       $namespace A path namespace
+     */
+    public function setPaths($paths, $namespace = self::MAIN_NAMESPACE)
+    {
+        if (!is_array($paths)) {
+            $paths = array($paths);
+        }
+
+        $this->paths[$namespace] = array();
+        foreach ($paths as $path) {
+            $this->addPath($path, $namespace);
+        }
+    }
+
+    /**
+     * Adds a path where templates are stored.
+     *
+     * @param string $path      A path where to look for templates
+     * @param string $namespace A path namespace
+     *
+     * @throws Twig_Error_Loader
+     */
+    public function addPath($path, $namespace = self::MAIN_NAMESPACE)
+    {
+        // invalidate the cache
+        $this->cache = $this->errorCache = array();
+
+        $checkPath = $this->isAbsolutePath($path) ? $path : $this->rootPath.$path;
+        if (!is_dir($checkPath)) {
+            throw new Twig_Error_Loader(sprintf('The "%s" directory does not exist ("%s").', $path, $checkPath));
+        }
+
+        $this->paths[$namespace][] = rtrim($path, '/\\');
+    }
+
+    /**
+     * Prepends a path where templates are stored.
+     *
+     * @param string $path      A path where to look for templates
+     * @param string $namespace A path namespace
+     *
+     * @throws Twig_Error_Loader
+     */
+    public function prependPath($path, $namespace = self::MAIN_NAMESPACE)
+    {
+        // invalidate the cache
+        $this->cache = $this->errorCache = array();
+
+        $checkPath = $this->isAbsolutePath($path) ? $path : $this->rootPath.$path;
+        if (!is_dir($checkPath)) {
+            throw new Twig_Error_Loader(sprintf('The "%s" directory does not exist ("%s").', $path, $checkPath));
+        }
+
+        $path = rtrim($path, '/\\');
+
+        if (!isset($this->paths[$namespace])) {
+            $this->paths[$namespace][] = $path;
+        } else {
+            array_unshift($this->paths[$namespace], $path);
+        }
+    }
+
+    public function getSourceContext($name)
+    {
+        $path = $this->findTemplate($name);
+
+        return new Twig_Source(file_get_contents($path), $name, $path);
+    }
+
+    public function getCacheKey($name)
+    {
+        $path = $this->findTemplate($name);
+        $len = strlen($this->rootPath);
+        if (0 === strncmp($this->rootPath, $path, $len)) {
+            return substr($path, $len);
+        }
+
+        return $path;
+    }
+
+    public function exists($name)
+    {
+        $name = $this->normalizeName($name);
+
+        if (isset($this->cache[$name])) {
+            return true;
+        }
+
+        return false !== $this->findTemplate($name, false);
+    }
+
+    public function isFresh($name, $time)
+    {
+        return filemtime($this->findTemplate($name)) <= $time;
+    }
+
+    /**
+     * Checks if the template can be found.
+     *
+     * @param string $name  The template name
+     * @param bool   $throw Whether to throw an exception when an error occurs
+     *
+     * @return string|false The template name or false
+     */
+    protected function findTemplate($name, $throw = true)
+    {
+        $name = $this->normalizeName($name);
+
+        if (isset($this->cache[$name])) {
+            return $this->cache[$name];
+        }
+
+        if (isset($this->errorCache[$name])) {
+            if (!$throw) {
+                return false;
+            }
+
+            throw new Twig_Error_Loader($this->errorCache[$name]);
+        }
+
+        $this->validateName($name);
+
+        list($namespace, $shortname) = $this->parseName($name);
+
+        if (!isset($this->paths[$namespace])) {
+            $this->errorCache[$name] = sprintf('There are no registered paths for namespace "%s".', $namespace);
+
+            if (!$throw) {
+                return false;
+            }
+
+            throw new Twig_Error_Loader($this->errorCache[$name]);
+        }
+
+        foreach ($this->paths[$namespace] as $path) {
+            if (!$this->isAbsolutePath($path)) {
+                $path = $this->rootPath.'/'.$path;
+            }
+
+            if (is_file($path.'/'.$shortname)) {
+                if (false !== $realpath = realpath($path.'/'.$shortname)) {
+                    return $this->cache[$name] = $realpath;
+                }
+
+                return $this->cache[$name] = $path.'/'.$shortname;
+            }
+        }
+
+        $this->errorCache[$name] = sprintf('Unable to find template "%s" (looked into: %s).', $name, implode(', ', $this->paths[$namespace]));
+
+        if (!$throw) {
+            return false;
+        }
+
+        throw new Twig_Error_Loader($this->errorCache[$name]);
+    }
+
+    private function normalizeName($name)
+    {
+        return preg_replace('#/{2,}#', '/', str_replace('\\', '/', $name));
+    }
+
+    private function parseName($name, $default = self::MAIN_NAMESPACE)
+    {
+        if (isset($name[0]) && '@' == $name[0]) {
+            if (false === $pos = strpos($name, '/')) {
+                throw new Twig_Error_Loader(sprintf('Malformed namespaced template name "%s" (expecting "@namespace/template_name").', $name));
+            }
+
+            $namespace = substr($name, 1, $pos - 1);
+            $shortname = substr($name, $pos + 1);
+
+            return array($namespace, $shortname);
+        }
+
+        return array($default, $name);
+    }
+
+    private function validateName($name)
+    {
+        if (false !== strpos($name, "\0")) {
+            throw new Twig_Error_Loader('A template name cannot contain NUL bytes.');
+        }
+
+        $name = ltrim($name, '/');
+        $parts = explode('/', $name);
+        $level = 0;
+        foreach ($parts as $part) {
+            if ('..' === $part) {
+                --$level;
+            } elseif ('.' !== $part) {
+                ++$level;
+            }
+
+            if ($level < 0) {
+                throw new Twig_Error_Loader(sprintf('Looks like you try to load a template outside configured directories (%s).', $name));
+            }
+        }
+    }
+
+    private function isAbsolutePath($file)
+    {
+        return strspn($file, '/\\', 0, 1)
+            || (strlen($file) > 3 && ctype_alpha($file[0])
+                && ':' === $file[1]
+                && strspn($file, '/\\', 2, 1)
+            )
+            || null !== parse_url($file, PHP_URL_SCHEME)
+        ;
+    }
+}

lib/Twig/LoaderInterface.php

@@ -0,0 +1,62 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface all loaders must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_LoaderInterface
+{
+    /**
+     * Returns the source context for a given template logical name.
+     *
+     * @param string $name The template logical name
+     *
+     * @return Twig_Source
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function getSourceContext($name);
+
+    /**
+     * Gets the cache key to use for the cache for a given template name.
+     *
+     * @param string $name The name of the template to load
+     *
+     * @return string The cache key
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function getCacheKey($name);
+
+    /**
+     * Returns true if the template is still fresh.
+     *
+     * @param string $name The template name
+     * @param int    $time Timestamp of the last modification time of the
+     *                     cached template
+     *
+     * @return bool true if the template is fresh, false otherwise
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function isFresh($name, $time);
+
+    /**
+     * Check if we have the source code of a template, given its name.
+     *
+     * @param string $name The name of the template to check if we can load
+     *
+     * @return bool If the template source code is handled by this loader or not
+     */
+    public function exists($name);
+}

lib/Twig/Markup.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Marks a content as safe.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Markup implements Countable, JsonSerializable
+{
+    private $content;
+    private $charset;
+
+    public function __construct($content, $charset)
+    {
+        $this->content = (string) $content;
+        $this->charset = $charset;
+    }
+
+    public function __toString()
+    {
+        return $this->content;
+    }
+
+    public function count()
+    {
+        return mb_strlen($this->content, $this->charset);
+    }
+
+    public function jsonSerialize()
+    {
+        return $this->content;
+    }
+}

lib/Twig/Node.php

@@ -0,0 +1,182 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node implements Countable, IteratorAggregate
+{
+    protected $nodes;
+    protected $attributes;
+    protected $lineno;
+    protected $tag;
+
+    private $name;
+
+    /**
+     * Constructor.
+     *
+     * The nodes are automatically made available as properties ($this->node).
+     * The attributes are automatically made available as array items ($this['name']).
+     *
+     * @param array  $nodes      An array of named nodes
+     * @param array  $attributes An array of attributes (should not be nodes)
+     * @param int    $lineno     The line number
+     * @param string $tag        The tag name associated with the Node
+     */
+    public function __construct(array $nodes = array(), array $attributes = array(), $lineno = 0, $tag = null)
+    {
+        foreach ($nodes as $name => $node) {
+            if (!$node instanceof self) {
+                throw new InvalidArgumentException(sprintf('Using "%s" for the value of node "%s" of "%s" is not supported. You must pass a Twig_Node instance.', is_object($node) ? get_class($node) : null === $node ? 'null' : gettype($node), $name, get_class($this)));
+            }
+        }
+        $this->nodes = $nodes;
+        $this->attributes = $attributes;
+        $this->lineno = $lineno;
+        $this->tag = $tag;
+    }
+
+    public function __toString()
+    {
+        $attributes = array();
+        foreach ($this->attributes as $name => $value) {
+            $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
+        }
+
+        $repr = array(get_class($this).'('.implode(', ', $attributes));
+
+        if (count($this->nodes)) {
+            foreach ($this->nodes as $name => $node) {
+                $len = strlen($name) + 4;
+                $noderepr = array();
+                foreach (explode("\n", (string) $node) as $line) {
+                    $noderepr[] = str_repeat(' ', $len).$line;
+                }
+
+                $repr[] = sprintf('  %s: %s', $name, ltrim(implode("\n", $noderepr)));
+            }
+
+            $repr[] = ')';
+        } else {
+            $repr[0] .= ')';
+        }
+
+        return implode("\n", $repr);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        foreach ($this->nodes as $node) {
+            $node->compile($compiler);
+        }
+    }
+
+    public function getTemplateLine()
+    {
+        return $this->lineno;
+    }
+
+    public function getNodeTag()
+    {
+        return $this->tag;
+    }
+
+    /**
+     * @return bool
+     */
+    public function hasAttribute($name)
+    {
+        return array_key_exists($name, $this->attributes);
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getAttribute($name)
+    {
+        if (!array_key_exists($name, $this->attributes)) {
+            throw new LogicException(sprintf('Attribute "%s" does not exist for Node "%s".', $name, get_class($this)));
+        }
+
+        return $this->attributes[$name];
+    }
+
+    /**
+     * @param string $name
+     * @param mixed  $value
+     */
+    public function setAttribute($name, $value)
+    {
+        $this->attributes[$name] = $value;
+    }
+
+    public function removeAttribute($name)
+    {
+        unset($this->attributes[$name]);
+    }
+
+    /**
+     * @return bool
+     */
+    public function hasNode($name)
+    {
+        return isset($this->nodes[$name]);
+    }
+
+    /**
+     * @return Twig_Node
+     */
+    public function getNode($name)
+    {
+        if (!isset($this->nodes[$name])) {
+            throw new LogicException(sprintf('Node "%s" does not exist for Node "%s".', $name, get_class($this)));
+        }
+
+        return $this->nodes[$name];
+    }
+
+    public function setNode($name, Twig_Node $node)
+    {
+        $this->nodes[$name] = $node;
+    }
+
+    public function removeNode($name)
+    {
+        unset($this->nodes[$name]);
+    }
+
+    public function count()
+    {
+        return count($this->nodes);
+    }
+
+    public function getIterator()
+    {
+        return new ArrayIterator($this->nodes);
+    }
+
+    public function setTemplateName($name)
+    {
+        $this->name = $name;
+        foreach ($this->nodes as $node) {
+            $node->setTemplateName($name);
+        }
+    }
+
+    public function getTemplateName()
+    {
+        return $this->name;
+    }
+}

lib/Twig/Node/AutoEscape.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an autoescape node.
+ *
+ * The value is the escaping strategy (can be html, js, ...)
+ *
+ * The true value is equivalent to html.
+ *
+ * If autoescaping is disabled, then the value is false.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_AutoEscape extends Twig_Node
+{
+    public function __construct($value, Twig_Node $body, $lineno, $tag = 'autoescape')
+    {
+        parent::__construct(array('body' => $body), array('value' => $value), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('body'));
+    }
+}

lib/Twig/Node/Block.php

@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Block extends Twig_Node
+{
+    public function __construct($name, Twig_Node $body, $lineno, $tag = null)
+    {
+        parent::__construct(array('body' => $body), array('name' => $name), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("public function block_%s(\$context, array \$blocks = array())\n", $this->getAttribute('name')), "{\n")
+            ->indent()
+        ;
+
+        $compiler
+            ->subcompile($this->getNode('body'))
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+}

lib/Twig/Node/BlockReference.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_BlockReference extends Twig_Node implements Twig_NodeOutputInterface
+{
+    public function __construct($name, $lineno, $tag = null)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("\$this->displayBlock('%s', \$context, \$blocks);\n", $this->getAttribute('name')))
+        ;
+    }
+}

lib/Twig/Node/Body.php

@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a body node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Body extends Twig_Node
+{
+}

lib/Twig/Node/CheckSecurity.php

@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2015 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_CheckSecurity extends Twig_Node
+{
+    private $usedFilters;
+    private $usedTags;
+    private $usedFunctions;
+
+    public function __construct(array $usedFilters, array $usedTags, array $usedFunctions)
+    {
+        $this->usedFilters = $usedFilters;
+        $this->usedTags = $usedTags;
+        $this->usedFunctions = $usedFunctions;
+
+        parent::__construct();
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $tags = $filters = $functions = array();
+        foreach (array('tags', 'filters', 'functions') as $type) {
+            foreach ($this->{'used'.ucfirst($type)} as $name => $node) {
+                if ($node instanceof Twig_Node) {
+                    ${$type}[$name] = $node->getTemplateLine();
+                } else {
+                    ${$type}[$node] = null;
+                }
+            }
+        }
+
+        $compiler
+            ->write('$tags = ')->repr(array_filter($tags))->raw(";\n")
+            ->write('$filters = ')->repr(array_filter($filters))->raw(";\n")
+            ->write('$functions = ')->repr(array_filter($functions))->raw(";\n\n")
+            ->write("try {\n")
+            ->indent()
+            ->write("\$this->env->getExtension('Twig_Extension_Sandbox')->checkSecurity(\n")
+            ->indent()
+            ->write(!$tags ? "array(),\n" : "array('".implode("', '", array_keys($tags))."'),\n")
+            ->write(!$filters ? "array(),\n" : "array('".implode("', '", array_keys($filters))."'),\n")
+            ->write(!$functions ? "array()\n" : "array('".implode("', '", array_keys($functions))."')\n")
+            ->outdent()
+            ->write(");\n")
+            ->outdent()
+            ->write("} catch (Twig_Sandbox_SecurityError \$e) {\n")
+            ->indent()
+            ->write("\$e->setSourceContext(\$this->getSourceContext());\n\n")
+            ->write("if (\$e instanceof Twig_Sandbox_SecurityNotAllowedTagError && isset(\$tags[\$e->getTagName()])) {\n")
+            ->indent()
+            ->write("\$e->setTemplateLine(\$tags[\$e->getTagName()]);\n")
+            ->outdent()
+            ->write("} elseif (\$e instanceof Twig_Sandbox_SecurityNotAllowedFilterError && isset(\$filters[\$e->getFilterName()])) {\n")
+            ->indent()
+            ->write("\$e->setTemplateLine(\$filters[\$e->getFilterName()]);\n")
+            ->outdent()
+            ->write("} elseif (\$e instanceof Twig_Sandbox_SecurityNotAllowedFunctionError && isset(\$functions[\$e->getFunctionName()])) {\n")
+            ->indent()
+            ->write("\$e->setTemplateLine(\$functions[\$e->getFunctionName()]);\n")
+            ->outdent()
+            ->write("}\n\n")
+            ->write("throw \$e;\n")
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+}

lib/Twig/Node/Do.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a do node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Do extends Twig_Node
+{
+    public function __construct(Twig_Node_Expression $expr, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('')
+            ->subcompile($this->getNode('expr'))
+            ->raw(";\n")
+        ;
+    }
+}

lib/Twig/Node/Embed.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an embed node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Embed extends Twig_Node_Include
+{
+    // we don't inject the module to avoid node visitors to traverse it twice (as it will be already visited in the main module)
+    public function __construct($name, $index, Twig_Node_Expression $variables = null, $only = false, $ignoreMissing = false, $lineno, $tag = null)
+    {
+        parent::__construct(new Twig_Node_Expression_Constant('not_used', $lineno), $variables, $only, $ignoreMissing, $lineno, $tag);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('index', $index);
+    }
+
+    protected function addGetTemplate(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write('$this->loadTemplate(')
+            ->string($this->getAttribute('name'))
+            ->raw(', ')
+            ->repr($this->getTemplateName())
+            ->raw(', ')
+            ->repr($this->getTemplateLine())
+            ->raw(', ')
+            ->string($this->getAttribute('index'))
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression.php

@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Abstract class for all nodes that represents an expression.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Twig_Node_Expression extends Twig_Node
+{
+}

lib/Twig/Node/Expression/Array.php

@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Array extends Twig_Node_Expression
+{
+    private $index;
+
+    public function __construct(array $elements, $lineno)
+    {
+        parent::__construct($elements, array(), $lineno);
+
+        $this->index = -1;
+        foreach ($this->getKeyValuePairs() as $pair) {
+            if ($pair['key'] instanceof Twig_Node_Expression_Constant && ctype_digit((string) $pair['key']->getAttribute('value')) && $pair['key']->getAttribute('value') > $this->index) {
+                $this->index = $pair['key']->getAttribute('value');
+            }
+        }
+    }
+
+    public function getKeyValuePairs()
+    {
+        $pairs = array();
+
+        foreach (array_chunk($this->nodes, 2) as $pair) {
+            $pairs[] = array(
+                'key' => $pair[0],
+                'value' => $pair[1],
+            );
+        }
+
+        return $pairs;
+    }
+
+    public function hasElement(Twig_Node_Expression $key)
+    {
+        foreach ($this->getKeyValuePairs() as $pair) {
+            // we compare the string representation of the keys
+            // to avoid comparing the line numbers which are not relevant here.
+            if ((string) $key === (string) $pair['key']) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public function addElement(Twig_Node_Expression $value, Twig_Node_Expression $key = null)
+    {
+        if (null === $key) {
+            $key = new Twig_Node_Expression_Constant(++$this->index, $value->getTemplateLine());
+        }
+
+        array_push($this->nodes, $key, $value);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('array(');
+        $first = true;
+        foreach ($this->getKeyValuePairs() as $pair) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $first = false;
+
+            $compiler
+                ->subcompile($pair['key'])
+                ->raw(' => ')
+                ->subcompile($pair['value'])
+            ;
+        }
+        $compiler->raw(')');
+    }
+}

lib/Twig/Node/Expression/AssignName.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class Twig_Node_Expression_AssignName extends Twig_Node_Expression_Name
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('$context[')
+            ->string($this->getAttribute('name'))
+            ->raw(']')
+        ;
+    }
+}

lib/Twig/Node/Expression/Binary.php

@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Binary extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node $left, Twig_Node $right, $lineno)
+    {
+        parent::__construct(array('left' => $left, 'right' => $right), array(), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('left'))
+            ->raw(' ')
+        ;
+        $this->operator($compiler);
+        $compiler
+            ->raw(' ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    abstract public function operator(Twig_Compiler $compiler);
+}

lib/Twig/Node/Expression/Binary/Add.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Add extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('+');
+    }
+}

lib/Twig/Node/Expression/Binary/And.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_And extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('&&');
+    }
+}

lib/Twig/Node/Expression/Binary/BitwiseAnd.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseAnd extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('&');
+    }
+}

lib/Twig/Node/Expression/Binary/BitwiseOr.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseOr extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('|');
+    }
+}

lib/Twig/Node/Expression/Binary/BitwiseXor.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseXor extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('^');
+    }
+}

lib/Twig/Node/Expression/Binary/Concat.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Concat extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('.');
+    }
+}

lib/Twig/Node/Expression/Binary/Div.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Div extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('/');
+    }
+}

lib/Twig/Node/Expression/Binary/EndsWith.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2013 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_EndsWith extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $left = $compiler->getVarName();
+        $right = $compiler->getVarName();
+        $compiler
+            ->raw(sprintf('(is_string($%s = ', $left))
+            ->subcompile($this->getNode('left'))
+            ->raw(sprintf(') && is_string($%s = ', $right))
+            ->subcompile($this->getNode('right'))
+            ->raw(sprintf(') && (\'\' === $%2$s || $%2$s === substr($%1$s, -strlen($%2$s))))', $left, $right))
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('');
+    }
+}

lib/Twig/Node/Expression/Binary/Equal.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Equal extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('==');
+    }
+}

lib/Twig/Node/Expression/Binary/FloorDiv.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_FloorDiv extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('(int) floor(');
+        parent::compile($compiler);
+        $compiler->raw(')');
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('/');
+    }
+}

lib/Twig/Node/Expression/Binary/Greater.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Greater extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('>');
+    }
+}

lib/Twig/Node/Expression/Binary/GreaterEqual.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_GreaterEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('>=');
+    }
+}

lib/Twig/Node/Expression/Binary/In.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_In extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('in');
+    }
+}

lib/Twig/Node/Expression/Binary/Less.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Less extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('<');
+    }
+}

lib/Twig/Node/Expression/Binary/LessEqual.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_LessEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('<=');
+    }
+}

lib/Twig/Node/Expression/Binary/Matches.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2013 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Matches extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('preg_match(')
+            ->subcompile($this->getNode('right'))
+            ->raw(', ')
+            ->subcompile($this->getNode('left'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('');
+    }
+}

lib/Twig/Node/Expression/Binary/Mod.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Mod extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('%');
+    }
+}

lib/Twig/Node/Expression/Binary/Mul.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Mul extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('*');
+    }
+}

lib/Twig/Node/Expression/Binary/NotEqual.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('!=');
+    }
+}

lib/Twig/Node/Expression/Binary/NotIn.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotIn extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('!twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('not in');
+    }
+}

lib/Twig/Node/Expression/Binary/Or.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Or extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('||');
+    }
+}

lib/Twig/Node/Expression/Binary/Power.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Power extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('**');
+    }
+}

lib/Twig/Node/Expression/Binary/Range.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Range extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('range(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('..');
+    }
+}

lib/Twig/Node/Expression/Binary/StartsWith.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2013 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_StartsWith extends Twig_Node_Expression_Binary
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $left = $compiler->getVarName();
+        $right = $compiler->getVarName();
+        $compiler
+            ->raw(sprintf('(is_string($%s = ', $left))
+            ->subcompile($this->getNode('left'))
+            ->raw(sprintf(') && is_string($%s = ', $right))
+            ->subcompile($this->getNode('right'))
+            ->raw(sprintf(') && (\'\' === $%2$s || 0 === strpos($%1$s, $%2$s)))', $left, $right))
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('');
+    }
+}

lib/Twig/Node/Expression/Binary/Sub.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Sub extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('-');
+    }
+}

lib/Twig/Node/Expression/BlockReference.php

@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_BlockReference extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node $name, Twig_Node $template = null, $lineno, $tag = null)
+    {
+        $nodes = array('name' => $name);
+        if (null !== $template) {
+            $nodes['template'] = $template;
+        }
+
+        parent::__construct($nodes, array('is_defined_test' => false, 'output' => false), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('is_defined_test')) {
+            $this->compileTemplateCall($compiler, 'hasBlock');
+        } else {
+            if ($this->getAttribute('output')) {
+                $compiler->addDebugInfo($this);
+
+                $this
+                    ->compileTemplateCall($compiler, 'displayBlock')
+                    ->raw(";\n");
+            } else {
+                $this->compileTemplateCall($compiler, 'renderBlock');
+            }
+        }
+    }
+
+    private function compileTemplateCall(Twig_Compiler $compiler, $method)
+    {
+        if (!$this->hasNode('template')) {
+            $compiler->write('$this');
+        } else {
+            $compiler
+                ->write('$this->loadTemplate(')
+                ->subcompile($this->getNode('template'))
+                ->raw(', ')
+                ->repr($this->getTemplateName())
+                ->raw(', ')
+                ->repr($this->getTemplateLine())
+                ->raw(')')
+            ;
+        }
+
+        $compiler->raw(sprintf('->%s', $method));
+        $this->compileBlockArguments($compiler);
+
+        return $compiler;
+    }
+
+    private function compileBlockArguments(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('name'))
+            ->raw(', $context');
+
+        if (!$this->hasNode('template')) {
+            $compiler->raw(', $blocks');
+        }
+
+        return $compiler->raw(')');
+    }
+}

lib/Twig/Node/Expression/Call.php

@@ -0,0 +1,284 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Call extends Twig_Node_Expression
+{
+    private $reflector;
+
+    protected function compileCallable(Twig_Compiler $compiler)
+    {
+        $callable = $this->getAttribute('callable');
+
+        $closingParenthesis = false;
+        if (is_string($callable) && false === strpos($callable, '::')) {
+            $compiler->raw($callable);
+        } else {
+            list($r, $callable) = $this->reflectCallable($callable);
+            if ($r instanceof ReflectionMethod && is_string($callable[0])) {
+                if ($r->isStatic()) {
+                    $compiler->raw(sprintf('%s::%s', $callable[0], $callable[1]));
+                } else {
+                    $compiler->raw(sprintf('$this->env->getRuntime(\'%s\')->%s', $callable[0], $callable[1]));
+                }
+            } elseif ($r instanceof ReflectionMethod && $callable[0] instanceof Twig_ExtensionInterface) {
+                $compiler->raw(sprintf('$this->env->getExtension(\'%s\')->%s', get_class($callable[0]), $callable[1]));
+            } else {
+                $closingParenthesis = true;
+                $compiler->raw(sprintf('call_user_func_array($this->env->get%s(\'%s\')->getCallable(), array', ucfirst($this->getAttribute('type')), $this->getAttribute('name')));
+            }
+        }
+
+        $this->compileArguments($compiler);
+
+        if ($closingParenthesis) {
+            $compiler->raw(')');
+        }
+    }
+
+    protected function compileArguments(Twig_Compiler $compiler)
+    {
+        $compiler->raw('(');
+
+        $first = true;
+
+        if ($this->hasAttribute('needs_environment') && $this->getAttribute('needs_environment')) {
+            $compiler->raw('$this->env');
+            $first = false;
+        }
+
+        if ($this->hasAttribute('needs_context') && $this->getAttribute('needs_context')) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $compiler->raw('$context');
+            $first = false;
+        }
+
+        if ($this->hasAttribute('arguments')) {
+            foreach ($this->getAttribute('arguments') as $argument) {
+                if (!$first) {
+                    $compiler->raw(', ');
+                }
+                $compiler->string($argument);
+                $first = false;
+            }
+        }
+
+        if ($this->hasNode('node')) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $compiler->subcompile($this->getNode('node'));
+            $first = false;
+        }
+
+        if ($this->hasNode('arguments')) {
+            $callable = $this->getAttribute('callable');
+            $arguments = $this->getArguments($callable, $this->getNode('arguments'));
+            foreach ($arguments as $node) {
+                if (!$first) {
+                    $compiler->raw(', ');
+                }
+                $compiler->subcompile($node);
+                $first = false;
+            }
+        }
+
+        $compiler->raw(')');
+    }
+
+    protected function getArguments($callable = null, $arguments)
+    {
+        $callType = $this->getAttribute('type');
+        $callName = $this->getAttribute('name');
+
+        $parameters = array();
+        $named = false;
+        foreach ($arguments as $name => $node) {
+            if (!is_int($name)) {
+                $named = true;
+                $name = $this->normalizeName($name);
+            } elseif ($named) {
+                throw new Twig_Error_Syntax(sprintf('Positional arguments cannot be used after named arguments for %s "%s".', $callType, $callName));
+            }
+
+            $parameters[$name] = $node;
+        }
+
+        $isVariadic = $this->hasAttribute('is_variadic') && $this->getAttribute('is_variadic');
+        if (!$named && !$isVariadic) {
+            return $parameters;
+        }
+
+        if (!$callable) {
+            if ($named) {
+                $message = sprintf('Named arguments are not supported for %s "%s".', $callType, $callName);
+            } else {
+                $message = sprintf('Arbitrary positional arguments are not supported for %s "%s".', $callType, $callName);
+            }
+
+            throw new LogicException($message);
+        }
+
+        $callableParameters = $this->getCallableParameters($callable, $isVariadic);
+        $arguments = array();
+        $names = array();
+        $missingArguments = array();
+        $optionalArguments = array();
+        $pos = 0;
+        foreach ($callableParameters as $callableParameter) {
+            $names[] = $name = $this->normalizeName($callableParameter->name);
+
+            if (array_key_exists($name, $parameters)) {
+                if (array_key_exists($pos, $parameters)) {
+                    throw new Twig_Error_Syntax(sprintf('Argument "%s" is defined twice for %s "%s".', $name, $callType, $callName));
+                }
+
+                if (count($missingArguments)) {
+                    throw new Twig_Error_Syntax(sprintf(
+                        'Argument "%s" could not be assigned for %s "%s(%s)" because it is mapped to an internal PHP function which cannot determine default value for optional argument%s "%s".',
+                        $name, $callType, $callName, implode(', ', $names), count($missingArguments) > 1 ? 's' : '', implode('", "', $missingArguments))
+                    );
+                }
+
+                $arguments = array_merge($arguments, $optionalArguments);
+                $arguments[] = $parameters[$name];
+                unset($parameters[$name]);
+                $optionalArguments = array();
+            } elseif (array_key_exists($pos, $parameters)) {
+                $arguments = array_merge($arguments, $optionalArguments);
+                $arguments[] = $parameters[$pos];
+                unset($parameters[$pos]);
+                $optionalArguments = array();
+                ++$pos;
+            } elseif ($callableParameter->isDefaultValueAvailable()) {
+                $optionalArguments[] = new Twig_Node_Expression_Constant($callableParameter->getDefaultValue(), -1);
+            } elseif ($callableParameter->isOptional()) {
+                if (empty($parameters)) {
+                    break;
+                } else {
+                    $missingArguments[] = $name;
+                }
+            } else {
+                throw new Twig_Error_Syntax(sprintf('Value for argument "%s" is required for %s "%s".', $name, $callType, $callName));
+            }
+        }
+
+        if ($isVariadic) {
+            $arbitraryArguments = new Twig_Node_Expression_Array(array(), -1);
+            foreach ($parameters as $key => $value) {
+                if (is_int($key)) {
+                    $arbitraryArguments->addElement($value);
+                } else {
+                    $arbitraryArguments->addElement($value, new Twig_Node_Expression_Constant($key, -1));
+                }
+                unset($parameters[$key]);
+            }
+
+            if ($arbitraryArguments->count()) {
+                $arguments = array_merge($arguments, $optionalArguments);
+                $arguments[] = $arbitraryArguments;
+            }
+        }
+
+        if (!empty($parameters)) {
+            $unknownParameter = null;
+            foreach ($parameters as $parameter) {
+                if ($parameter instanceof Twig_Node) {
+                    $unknownParameter = $parameter;
+                    break;
+                }
+            }
+
+            throw new Twig_Error_Syntax(sprintf(
+                'Unknown argument%s "%s" for %s "%s(%s)".',
+                count($parameters) > 1 ? 's' : '', implode('", "', array_keys($parameters)), $callType, $callName, implode(', ', $names)
+            ), $unknownParameter ? $unknownParameter->getTemplateLine() : -1);
+        }
+
+        return $arguments;
+    }
+
+    protected function normalizeName($name)
+    {
+        return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), $name));
+    }
+
+    private function getCallableParameters($callable, $isVariadic)
+    {
+        list($r) = $this->reflectCallable($callable);
+        if (null === $r) {
+            return array();
+        }
+
+        $parameters = $r->getParameters();
+        if ($this->hasNode('node')) {
+            array_shift($parameters);
+        }
+        if ($this->hasAttribute('needs_environment') && $this->getAttribute('needs_environment')) {
+            array_shift($parameters);
+        }
+        if ($this->hasAttribute('needs_context') && $this->getAttribute('needs_context')) {
+            array_shift($parameters);
+        }
+        if ($this->hasAttribute('arguments') && null !== $this->getAttribute('arguments')) {
+            foreach ($this->getAttribute('arguments') as $argument) {
+                array_shift($parameters);
+            }
+        }
+        if ($isVariadic) {
+            $argument = end($parameters);
+            if ($argument && $argument->isArray() && $argument->isDefaultValueAvailable() && array() === $argument->getDefaultValue()) {
+                array_pop($parameters);
+            } else {
+                $callableName = $r->name;
+                if ($r instanceof ReflectionMethod) {
+                    $callableName = $r->getDeclaringClass()->name.'::'.$callableName;
+                }
+
+                throw new LogicException(sprintf('The last parameter of "%s" for %s "%s" must be an array with default value, eg. "array $arg = array()".', $callableName, $this->getAttribute('type'), $this->getAttribute('name')));
+            }
+        }
+
+        return $parameters;
+    }
+
+    private function reflectCallable($callable)
+    {
+        if (null !== $this->reflector) {
+            return $this->reflector;
+        }
+
+        if (is_array($callable)) {
+            if (!method_exists($callable[0], $callable[1])) {
+                // __call()
+                return array(null, array());
+            }
+            $r = new ReflectionMethod($callable[0], $callable[1]);
+        } elseif (is_object($callable) && !$callable instanceof Closure) {
+            $r = new ReflectionObject($callable);
+            $r = $r->getMethod('__invoke');
+            $callable = array($callable, '__invoke');
+        } elseif (is_string($callable) && false !== $pos = strpos($callable, '::')) {
+            $class = substr($callable, 0, $pos);
+            $method = substr($callable, $pos + 2);
+            if (!method_exists($class, $method)) {
+                // __staticCall()
+                return array(null, array());
+            }
+            $r = new ReflectionMethod($callable);
+            $callable = array($class, $method);
+        } else {
+            $r = new ReflectionFunction($callable);
+        }
+
+        return $this->reflector = array($r, $callable);
+    }
+}

lib/Twig/Node/Expression/Conditional.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Conditional extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $expr1, Twig_Node_Expression $expr2, Twig_Node_Expression $expr3, $lineno)
+    {
+        parent::__construct(array('expr1' => $expr1, 'expr2' => $expr2, 'expr3' => $expr3), array(), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('((')
+            ->subcompile($this->getNode('expr1'))
+            ->raw(') ? (')
+            ->subcompile($this->getNode('expr2'))
+            ->raw(') : (')
+            ->subcompile($this->getNode('expr3'))
+            ->raw('))')
+        ;
+    }
+}

lib/Twig/Node/Expression/Constant.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Constant extends Twig_Node_Expression
+{
+    public function __construct($value, $lineno)
+    {
+        parent::__construct(array(), array('value' => $value), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->repr($this->getAttribute('value'));
+    }
+}

lib/Twig/Node/Expression/Filter.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Filter extends Twig_Node_Expression_Call
+{
+    public function __construct(Twig_Node $node, Twig_Node_Expression_Constant $filterName, Twig_Node $arguments, $lineno, $tag = null)
+    {
+        parent::__construct(array('node' => $node, 'filter' => $filterName, 'arguments' => $arguments), array(), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getNode('filter')->getAttribute('value');
+        $filter = $compiler->getEnvironment()->getFilter($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'filter');
+        $this->setAttribute('needs_environment', $filter->needsEnvironment());
+        $this->setAttribute('needs_context', $filter->needsContext());
+        $this->setAttribute('arguments', $filter->getArguments());
+        $this->setAttribute('callable', $filter->getCallable());
+        $this->setAttribute('is_variadic', $filter->isVariadic());
+
+        $this->compileCallable($compiler);
+    }
+}

lib/Twig/Node/Expression/Filter/Default.php

@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Returns the value or the default value when it is undefined or empty.
+ *
+ * <pre>
+ *  {{ var.foo|default('foo item on var is not defined') }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Filter_Default extends Twig_Node_Expression_Filter
+{
+    public function __construct(Twig_Node $node, Twig_Node_Expression_Constant $filterName, Twig_Node $arguments, $lineno, $tag = null)
+    {
+        $default = new Twig_Node_Expression_Filter($node, new Twig_Node_Expression_Constant('default', $node->getTemplateLine()), $arguments, $node->getTemplateLine());
+
+        if ('default' === $filterName->getAttribute('value') && ($node instanceof Twig_Node_Expression_Name || $node instanceof Twig_Node_Expression_GetAttr)) {
+            $test = new Twig_Node_Expression_Test_Defined(clone $node, 'defined', new Twig_Node(), $node->getTemplateLine());
+            $false = count($arguments) ? $arguments->getNode(0) : new Twig_Node_Expression_Constant('', $node->getTemplateLine());
+
+            $node = new Twig_Node_Expression_Conditional($test, $default, $false, $node->getTemplateLine());
+        } else {
+            $node = $default;
+        }
+
+        parent::__construct($node, $filterName, $arguments, $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('node'));
+    }
+}

lib/Twig/Node/Expression/Function.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Function extends Twig_Node_Expression_Call
+{
+    public function __construct($name, Twig_Node $arguments, $lineno)
+    {
+        parent::__construct(array('arguments' => $arguments), array('name' => $name, 'is_defined_test' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+        $function = $compiler->getEnvironment()->getFunction($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'function');
+        $this->setAttribute('needs_environment', $function->needsEnvironment());
+        $this->setAttribute('needs_context', $function->needsContext());
+        $this->setAttribute('arguments', $function->getArguments());
+        $callable = $function->getCallable();
+        if ('constant' === $name && $this->getAttribute('is_defined_test')) {
+            $callable = 'twig_constant_is_defined';
+        }
+        $this->setAttribute('callable', $callable);
+        $this->setAttribute('is_variadic', $function->isVariadic());
+
+        $this->compileCallable($compiler);
+    }
+}

lib/Twig/Node/Expression/GetAttr.php

@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_GetAttr extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $node, Twig_Node_Expression $attribute, Twig_Node_Expression $arguments = null, $type, $lineno)
+    {
+        $nodes = array('node' => $node, 'attribute' => $attribute);
+        if (null !== $arguments) {
+            $nodes['arguments'] = $arguments;
+        }
+
+        parent::__construct($nodes, array('type' => $type, 'is_defined_test' => false, 'ignore_strict_check' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('twig_get_attribute($this->env, $this->getSourceContext(), ');
+
+        if ($this->getAttribute('ignore_strict_check')) {
+            $this->getNode('node')->setAttribute('ignore_strict_check', true);
+        }
+
+        $compiler->subcompile($this->getNode('node'));
+
+        $compiler->raw(', ')->subcompile($this->getNode('attribute'));
+
+        // only generate optional arguments when needed (to make generated code more readable)
+        $needFourth = $this->getAttribute('ignore_strict_check');
+        $needThird = $needFourth || $this->getAttribute('is_defined_test');
+        $needSecond = $needThird || Twig_Template::ANY_CALL !== $this->getAttribute('type');
+        $needFirst = $needSecond || $this->hasNode('arguments');
+
+        if ($needFirst) {
+            if ($this->hasNode('arguments')) {
+                $compiler->raw(', ')->subcompile($this->getNode('arguments'));
+            } else {
+                $compiler->raw(', array()');
+            }
+        }
+
+        if ($needSecond) {
+            $compiler->raw(', ')->repr($this->getAttribute('type'));
+        }
+
+        if ($needThird) {
+            $compiler->raw(', ')->repr($this->getAttribute('is_defined_test'));
+        }
+
+        if ($needFourth) {
+            $compiler->raw(', ')->repr($this->getAttribute('ignore_strict_check'));
+        }
+
+        $compiler->raw(')');
+    }
+}

lib/Twig/Node/Expression/MethodCall.php

@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_MethodCall extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $node, $method, Twig_Node_Expression_Array $arguments, $lineno)
+    {
+        parent::__construct(array('node' => $node, 'arguments' => $arguments), array('method' => $method, 'safe' => false), $lineno);
+
+        if ($node instanceof Twig_Node_Expression_Name) {
+            $node->setAttribute('always_defined', true);
+        }
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->subcompile($this->getNode('node'))
+            ->raw('->')
+            ->raw($this->getAttribute('method'))
+            ->raw('(')
+        ;
+        $first = true;
+        foreach ($this->getNode('arguments')->getKeyValuePairs() as $pair) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $first = false;
+
+            $compiler->subcompile($pair['value']);
+        }
+        $compiler->raw(')');
+    }
+}

lib/Twig/Node/Expression/Name.php

@@ -0,0 +1,91 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Name extends Twig_Node_Expression
+{
+    private $specialVars = array(
+        '_self' => '$this->getTemplateName()',
+        '_context' => '$context',
+        '_charset' => '$this->env->getCharset()',
+    );
+
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+
+        $compiler->addDebugInfo($this);
+
+        if ($this->getAttribute('is_defined_test')) {
+            if ($this->isSpecial()) {
+                $compiler->repr(true);
+            } else {
+                $compiler->raw('array_key_exists(')->repr($name)->raw(', $context)');
+            }
+        } elseif ($this->isSpecial()) {
+            $compiler->raw($this->specialVars[$name]);
+        } elseif ($this->getAttribute('always_defined')) {
+            $compiler
+                ->raw('$context[')
+                ->string($name)
+                ->raw(']')
+            ;
+        } else {
+            if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
+                if (PHP_VERSION_ID >= 70000) {
+                    // use PHP 7 null coalescing operator
+                    $compiler
+                        ->raw('($context[')
+                        ->string($name)
+                        ->raw('] ?? null)')
+                    ;
+                } else {
+                    $compiler
+                        ->raw('(isset($context[')
+                        ->string($name)
+                        ->raw(']) ? $context[')
+                        ->string($name)
+                        ->raw('] : null)')
+                    ;
+                }
+            } else {
+                $compiler
+                    ->raw('(isset($context[')
+                    ->string($name)
+                    ->raw(']) || array_key_exists(')
+                    ->string($name)
+                    ->raw(', $context) ? $context[')
+                    ->string($name)
+                    ->raw('] : (function () { throw new Twig_Error_Runtime(\'Variable ')
+                    ->string($name)
+                    ->raw(' does not exist.\', ')
+                    ->repr($this->lineno)
+                    ->raw(', $this->getSourceContext()); })()')
+                    ->raw(')')
+                ;
+            }
+        }
+    }
+
+    public function isSpecial()
+    {
+        return isset($this->specialVars[$this->getAttribute('name')]);
+    }
+
+    public function isSimple()
+    {
+        return !$this->isSpecial() && !$this->getAttribute('is_defined_test');
+    }
+}

lib/Twig/Node/Expression/NullCoalesce.php

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_NullCoalesce extends Twig_Node_Expression_Conditional
+{
+    public function __construct(Twig_Node $left, Twig_Node $right, $lineno)
+    {
+        $test = new Twig_Node_Expression_Binary_And(
+            new Twig_Node_Expression_Test_Defined(clone $left, 'defined', new Twig_Node(), $left->getTemplateLine()),
+            new Twig_Node_Expression_Unary_Not(new Twig_Node_Expression_Test_Null($left, 'null', new Twig_Node(), $left->getTemplateLine()), $left->getTemplateLine()),
+            $left->getTemplateLine()
+        );
+
+        parent::__construct($test, $left, $right, $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        /*
+         * This optimizes only one case. PHP 7 also supports more complex expressions
+         * that can return null. So, for instance, if log is defined, log("foo") ?? "..." works,
+         * but log($a["foo"]) ?? "..." does not if $a["foo"] is not defined. More advanced
+         * cases might be implemented as an optimizer node visitor, but has not been done
+         * as benefits are probably not worth the added complexity.
+         */
+        if (PHP_VERSION_ID >= 70000 && $this->getNode('expr2') instanceof Twig_Node_Expression_Name) {
+            $this->getNode('expr2')->setAttribute('always_defined', true);
+            $compiler
+                ->raw('((')
+                ->subcompile($this->getNode('expr2'))
+                ->raw(') ?? (')
+                ->subcompile($this->getNode('expr3'))
+                ->raw('))')
+            ;
+        } else {
+            parent::compile($compiler);
+        }
+    }
+}

lib/Twig/Node/Expression/Parent.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a parent node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Parent extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno, $tag = null)
+    {
+        parent::__construct(array(), array('output' => false, 'name' => $name), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('output')) {
+            $compiler
+                ->addDebugInfo($this)
+                ->write('$this->displayParentBlock(')
+                ->string($this->getAttribute('name'))
+                ->raw(", \$context, \$blocks);\n")
+            ;
+        } else {
+            $compiler
+                ->raw('$this->renderParentBlock(')
+                ->string($this->getAttribute('name'))
+                ->raw(', $context, $blocks)')
+            ;
+        }
+    }
+}

lib/Twig/Node/Expression/TempName.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_TempName extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('$_')
+            ->raw($this->getAttribute('name'))
+            ->raw('_')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test.php

@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Test extends Twig_Node_Expression_Call
+{
+    public function __construct(Twig_Node $node, $name, Twig_Node $arguments = null, $lineno)
+    {
+        $nodes = array('node' => $node);
+        if (null !== $arguments) {
+            $nodes['arguments'] = $arguments;
+        }
+
+        parent::__construct($nodes, array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+        $test = $compiler->getEnvironment()->getTest($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'test');
+        $this->setAttribute('callable', $test->getCallable());
+        $this->setAttribute('is_variadic', $test->isVariadic());
+
+        $this->compileCallable($compiler);
+    }
+}

lib/Twig/Node/Expression/Test/Constant.php

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is the exact same value as a constant.
+ *
+ * <pre>
+ *  {% if post.status is constant('Post::PUBLISHED') %}
+ *    the status attribute is exactly the same as Post::PUBLISHED
+ *  {% endif %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Constant extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' === constant(')
+        ;
+
+        if ($this->getNode('arguments')->hasNode(1)) {
+            $compiler
+                ->raw('get_class(')
+                ->subcompile($this->getNode('arguments')->getNode(1))
+                ->raw(')."::".')
+            ;
+        }
+
+        $compiler
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw('))')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test/Defined.php

@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is defined in the current context.
+ *
+ * <pre>
+ * {# defined works with variable names and variable attributes #}
+ * {% if foo is defined %}
+ *     {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Defined extends Twig_Node_Expression_Test
+{
+    public function __construct(Twig_Node $node, $name, Twig_Node $arguments = null, $lineno)
+    {
+        if ($node instanceof Twig_Node_Expression_Name) {
+            $node->setAttribute('is_defined_test', true);
+        } elseif ($node instanceof Twig_Node_Expression_GetAttr) {
+            $node->setAttribute('is_defined_test', true);
+            $this->changeIgnoreStrictCheck($node);
+        } elseif ($node instanceof Twig_Node_Expression_BlockReference) {
+            $node->setAttribute('is_defined_test', true);
+        } elseif ($node instanceof Twig_Node_Expression_Function && 'constant' === $node->getAttribute('name')) {
+            $node->setAttribute('is_defined_test', true);
+        } elseif ($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array) {
+            $node = new Twig_Node_Expression_Constant(true, $node->getTemplateLine());
+        } else {
+            throw new Twig_Error_Syntax('The "defined" test only works with simple variables.', $this->getTemplateLine());
+        }
+
+        parent::__construct($node, $name, $arguments, $lineno);
+    }
+
+    private function changeIgnoreStrictCheck(Twig_Node_Expression_GetAttr $node)
+    {
+        $node->setAttribute('ignore_strict_check', true);
+
+        if ($node->getNode('node') instanceof Twig_Node_Expression_GetAttr) {
+            $this->changeIgnoreStrictCheck($node->getNode('node'));
+        }
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('node'));
+    }
+}

lib/Twig/Node/Expression/Test/Divisibleby.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is divisible by a number.
+ *
+ * <pre>
+ *  {% if loop.index is divisible by(3) %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Divisibleby extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(0 == ')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % ')
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test/Even.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a number is even.
+ *
+ * <pre>
+ *  {{ var is even }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Even extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % 2 == 0')
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test/Null.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks that a variable is null.
+ *
+ * <pre>
+ *  {{ var is none }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Null extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(null === ')
+            ->subcompile($this->getNode('node'))
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test/Odd.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a number is odd.
+ *
+ * <pre>
+ *  {{ var is odd }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Odd extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % 2 == 1')
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression/Test/Sameas.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is the same as another one (=== in PHP).
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Sameas extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' === ')
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw(')')
+        ;
+    }
+}

lib/Twig/Node/Expression/Unary.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Unary extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node $node, $lineno)
+    {
+        parent::__construct(array('node' => $node), array(), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw(' ');
+        $this->operator($compiler);
+        $compiler->subcompile($this->getNode('node'));
+    }
+
+    abstract public function operator(Twig_Compiler $compiler);
+}

lib/Twig/Node/Expression/Unary/Neg.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Neg extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('-');
+    }
+}

lib/Twig/Node/Expression/Unary/Not.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Not extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('!');
+    }
+}

lib/Twig/Node/Expression/Unary/Pos.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Pos extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('+');
+    }
+}

lib/Twig/Node/Flush.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a flush node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Flush extends Twig_Node
+{
+    public function __construct($lineno, $tag)
+    {
+        parent::__construct(array(), array(), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write("flush();\n")
+        ;
+    }
+}

lib/Twig/Node/For.php

@@ -0,0 +1,111 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a for node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_For extends Twig_Node
+{
+    private $loop;
+
+    public function __construct(Twig_Node_Expression_AssignName $keyTarget, Twig_Node_Expression_AssignName $valueTarget, Twig_Node_Expression $seq, Twig_Node_Expression $ifexpr = null, Twig_Node $body, Twig_Node $else = null, $lineno, $tag = null)
+    {
+        $body = new Twig_Node(array($body, $this->loop = new Twig_Node_ForLoop($lineno, $tag)));
+
+        if (null !== $ifexpr) {
+            $body = new Twig_Node_If(new Twig_Node(array($ifexpr, $body)), null, $lineno, $tag);
+        }
+
+        $nodes = array('key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body);
+        if (null !== $else) {
+            $nodes['else'] = $else;
+        }
+
+        parent::__construct($nodes, array('with_loop' => true, 'ifexpr' => null !== $ifexpr), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write("\$context['_parent'] = \$context;\n")
+            ->write("\$context['_seq'] = twig_ensure_traversable(")
+            ->subcompile($this->getNode('seq'))
+            ->raw(");\n")
+        ;
+
+        if ($this->hasNode('else')) {
+            $compiler->write("\$context['_iterated'] = false;\n");
+        }
+
+        if ($this->getAttribute('with_loop')) {
+            $compiler
+                ->write("\$context['loop'] = array(\n")
+                ->write("  'parent' => \$context['_parent'],\n")
+                ->write("  'index0' => 0,\n")
+                ->write("  'index'  => 1,\n")
+                ->write("  'first'  => true,\n")
+                ->write(");\n")
+            ;
+
+            if (!$this->getAttribute('ifexpr')) {
+                $compiler
+                    ->write("if (is_array(\$context['_seq']) || (is_object(\$context['_seq']) && \$context['_seq'] instanceof Countable)) {\n")
+                    ->indent()
+                    ->write("\$length = count(\$context['_seq']);\n")
+                    ->write("\$context['loop']['revindex0'] = \$length - 1;\n")
+                    ->write("\$context['loop']['revindex'] = \$length;\n")
+                    ->write("\$context['loop']['length'] = \$length;\n")
+                    ->write("\$context['loop']['last'] = 1 === \$length;\n")
+                    ->outdent()
+                    ->write("}\n")
+                ;
+            }
+        }
+
+        $this->loop->setAttribute('else', $this->hasNode('else'));
+        $this->loop->setAttribute('with_loop', $this->getAttribute('with_loop'));
+        $this->loop->setAttribute('ifexpr', $this->getAttribute('ifexpr'));
+
+        $compiler
+            ->write("foreach (\$context['_seq'] as ")
+            ->subcompile($this->getNode('key_target'))
+            ->raw(' => ')
+            ->subcompile($this->getNode('value_target'))
+            ->raw(") {\n")
+            ->indent()
+            ->subcompile($this->getNode('body'))
+            ->outdent()
+            ->write("}\n")
+        ;
+
+        if ($this->hasNode('else')) {
+            $compiler
+                ->write("if (!\$context['_iterated']) {\n")
+                ->indent()
+                ->subcompile($this->getNode('else'))
+                ->outdent()
+                ->write("}\n")
+            ;
+        }
+
+        $compiler->write("\$_parent = \$context['_parent'];\n");
+
+        // remove some "private" loop variables (needed for nested loops)
+        $compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n");
+
+        // keep the values set in the inner context for variables defined in the outer context
+        $compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n");
+    }
+}