23 files changed, 2221 insertions, 0 deletions
diff --git a/phpBB/phpbb/template/twig/definition.php b/phpBB/phpbb/template/twig/definition.php
new file mode 100644
index 0000000000..cb3c953692
--- /dev/null
+++ b/phpBB/phpbb/template/twig/definition.php
@@ -0,0 +1,69 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+/**
+* This class holds all DEFINE variables from the current page load
+*/
+class definition
+{
+	/** @var array **/
+	protected $definitions = array();
+
+	/**
+	* Get a DEFINE'd variable
+	*
+	* @param string $name
+	* @param array $arguments
+	*
+	* @return mixed Null if not found
+	*/
+	public function __call($name, $arguments)
+	{
+		return (isset($this->definitions[$name])) ? $this->definitions[$name] : null;
+	}
+
+	/**
+	* DEFINE a variable
+	*
+	* @param string $name
+	* @param mixed $value
+	* @return \phpbb\template\twig\definition
+	*/
+	public function set($name, $value)
+	{
+		$this->definitions[$name] = $value;
+
+		return $this;
+	}
+
+	/**
+	* Append to a variable
+	*
+	* @param string $name
+	* @param string $value
+	* @return \phpbb\template\twig\definition
+	*/
+	public function append($name, $value)
+	{
+		if (!isset($this->definitions[$name]))
+		{
+			$this->definitions[$name] = '';
+		}
+
+		$this->definitions[$name] .= $value;
+
+		return $this;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/environment.php b/phpBB/phpbb/template/twig/environment.php
new file mode 100644
index 0000000000..476ffd935e
--- /dev/null
+++ b/phpBB/phpbb/template/twig/environment.php
@@ -0,0 +1,205 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+class environment extends \Twig_Environment
+{
+	/** @var \phpbb\config\config */
+	protected $phpbb_config;
+
+	/** @var \phpbb\path_helper */
+	protected $phpbb_path_helper;
+
+	/** @var \phpbb\extension\manager */
+	protected $extension_manager;
+
+	/** @var string */
+	protected $phpbb_root_path;
+
+	/** @var string */
+	protected $web_root_path;
+
+	/** @var array **/
+	protected $namespace_look_up_order = array('__main__');
+
+	/**
+	* Constructor
+	*
+	* @param \phpbb\config\config $phpbb_config The phpBB configuration
+	* @param \phpbb\path_helper $path_helper phpBB path helper
+	* @param \phpbb\extension\manager $extension_manager phpBB extension manager
+	* @param \Twig_LoaderInterface $loader Twig loader interface
+	* @param array $options Array of options to pass to Twig
+	*/
+	public function __construct($phpbb_config, \phpbb\path_helper $path_helper, \phpbb\extension\manager $extension_manager = null, \Twig_LoaderInterface $loader = null, $options = array())
+	{
+		$this->phpbb_config = $phpbb_config;
+
+		$this->phpbb_path_helper = $path_helper;
+		$this->extension_manager = $extension_manager;
+
+		$this->phpbb_root_path = $this->phpbb_path_helper->get_phpbb_root_path();
+		$this->web_root_path = $this->phpbb_path_helper->get_web_root_path();
+
+		return parent::__construct($loader, $options);
+	}
+
+	/**
+	* Get the list of enabled phpBB extensions
+	*
+	* Used in EVENT node
+	*
+	* @return array
+	*/
+	public function get_phpbb_extensions()
+	{
+		return ($this->extension_manager) ? $this->extension_manager->all_enabled() : array();
+	}
+
+	/**
+	* Get phpBB config
+	*
+	* @return \phpbb\config\config
+	*/
+	public function get_phpbb_config()
+	{
+		return $this->phpbb_config;
+	}
+
+	/**
+	* Get the phpBB root path
+	*
+	* @return string
+	*/
+	public function get_phpbb_root_path()
+	{
+		return $this->phpbb_root_path;
+	}
+
+	/**
+	* Get the web root path
+	*
+	* @return string
+	*/
+	public function get_web_root_path()
+	{
+		return $this->web_root_path;
+	}
+
+	/**
+	* Get the phpbb path helper object
+	*
+	* @return \phpbb\path_helper
+	*/
+	public function get_path_helper()
+	{
+		return $this->phpbb_path_helper;
+	}
+
+	/**
+	* Get the namespace look up order
+	*
+	* @return array
+	*/
+	public function getNamespaceLookUpOrder()
+	{
+		return $this->namespace_look_up_order;
+	}
+
+	/**
+	* Set the namespace look up order to load templates from
+	*
+	* @param array $namespace
+	* @return \Twig_Environment
+	*/
+	public function setNamespaceLookUpOrder($namespace)
+	{
+		$this->namespace_look_up_order = $namespace;
+
+		return $this;
+	}
+
+	/**
+	* Loads a template by name.
+	*
+	* @param string  $name  The template name
+	* @param integer $index The index if it is an embedded template
+	* @return \Twig_TemplateInterface A template instance representing the given template name
+	* @throws \Twig_Error_Loader
+	*/
+	public function loadTemplate($name, $index = null)
+	{
+		if (strpos($name, '@') === false)
+		{
+			foreach ($this->getNamespaceLookUpOrder() as $namespace)
+			{
+				try
+				{
+					if ($namespace === '__main__')
+					{
+						return parent::loadTemplate($name, $index);
+					}
+
+					return parent::loadTemplate('@' . $namespace . '/' . $name, $index);
+				}
+				catch (\Twig_Error_Loader $e)
+				{
+				}
+			}
+
+			// We were unable to load any templates
+			throw $e;
+		}
+		else
+		{
+			return parent::loadTemplate($name, $index);
+		}
+	}
+
+	/**
+	* Finds a template by name.
+	*
+	* @param string  $name  The template name
+	* @return string
+	* @throws \Twig_Error_Loader
+	*/
+	public function findTemplate($name)
+	{
+		if (strpos($name, '@') === false)
+		{
+			foreach ($this->getNamespaceLookUpOrder() as $namespace)
+			{
+				try
+				{
+					if ($namespace === '__main__')
+					{
+						return parent::getLoader()->getCacheKey($name);
+					}
+
+					return parent::getLoader()->getCacheKey('@' . $namespace . '/' . $name);
+				}
+				catch (\Twig_Error_Loader $e)
+				{
+				}
+			}
+
+			// We were unable to load any templates
+			throw $e;
+		}
+		else
+		{
+			return parent::getLoader()->getCacheKey($name);
+		}
+	}
+}
diff --git a/phpBB/phpbb/template/twig/extension.php b/phpBB/phpbb/template/twig/extension.php
new file mode 100644
index 0000000000..3a983491b9
--- /dev/null
+++ b/phpBB/phpbb/template/twig/extension.php
@@ -0,0 +1,185 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+class extension extends \Twig_Extension
+{
+	/** @var \phpbb\template\context */
+	protected $context;
+
+	/** @var \phpbb\user */
+	protected $user;
+
+	/**
+	* Constructor
+	*
+	* @param \phpbb\template\context $context
+	* @param \phpbb\user $user
+	* @return \phpbb\template\twig\extension
+	*/
+	public function __construct(\phpbb\template\context $context, $user)
+	{
+		$this->context = $context;
+		$this->user = $user;
+	}
+
+	/**
+	* Get the name of this extension
+	*
+	* @return string
+	*/
+	public function getName()
+	{
+		return 'phpbb';
+	}
+
+	/**
+	* Returns the token parser instance to add to the existing list.
+	*
+	* @return array An array of Twig_TokenParser instances
+	*/
+	public function getTokenParsers()
+	{
+		return array(
+			new \phpbb\template\twig\tokenparser\defineparser,
+			new \phpbb\template\twig\tokenparser\includeparser,
+			new \phpbb\template\twig\tokenparser\includejs,
+			new \phpbb\template\twig\tokenparser\includecss,
+			new \phpbb\template\twig\tokenparser\event,
+			new \phpbb\template\twig\tokenparser\includephp,
+			new \phpbb\template\twig\tokenparser\php,
+		);
+	}
+
+	/**
+	* Returns a list of filters to add to the existing list.
+	*
+	* @return array An array of filters
+	*/
+	public function getFilters()
+	{
+		return array(
+			new \Twig_SimpleFilter('subset', array($this, 'loop_subset'), array('needs_environment' => true)),
+			new \Twig_SimpleFilter('addslashes', 'addslashes'),
+		);
+	}
+
+	/**
+	* Returns a list of global functions to add to the existing list.
+	*
+	* @return array An array of global functions
+	*/
+	public function getFunctions()
+	{
+		return array(
+			new \Twig_SimpleFunction('lang', array($this, 'lang')),
+		);
+	}
+
+	/**
+	* Returns a list of operators to add to the existing list.
+	*
+	* @return array An array of operators
+	*/
+	public function getOperators()
+	{
+		return array(
+			array(
+				'!' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Not'),
+			),
+			array(
+				// precedence settings are copied from similar operators in Twig core extension
+				'||' => array('precedence' => 10, 'class' => 'Twig_Node_Expression_Binary_Or', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'&&' => array('precedence' => 15, 'class' => 'Twig_Node_Expression_Binary_And', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+
+				'eq' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Equal', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+
+				'ne' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'neq' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'<>' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+
+				'===' => array('precedence' => 20, 'class' => '\phpbb\template\twig\node\expression\binary\equalequal', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'!==' => array('precedence' => 20, 'class' => '\phpbb\template\twig\node\expression\binary\notequalequal', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+
+				'gt' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Greater', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'gte' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_GreaterEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'ge' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_GreaterEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'lt' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Less', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'lte' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_LessEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+				'le' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_LessEqual', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+
+				'mod' => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mod', 'associativity' => \Twig_ExpressionParser::OPERATOR_LEFT),
+			),
+		);
+	}
+
+	/**
+	* Grabs a subset of a loop
+	*
+	* @param \Twig_Environment $env          A Twig_Environment instance
+	* @param mixed            $item         A variable
+	* @param integer          $start        Start of the subset
+	* @param integer          $end   	     End of the subset
+	* @param Boolean          $preserveKeys Whether to preserve key or not (when the input is an array)
+	*
+	* @return mixed The sliced variable
+	*/
+	function loop_subset(\Twig_Environment $env, $item, $start, $end = null, $preserveKeys = false)
+	{
+		// We do almost the same thing as Twig's slice (array_slice), except when $end is positive
+		if ($end >= 1)
+		{
+			// When end is > 1, subset will end on the last item in an array with the specified $end
+			// This is different from slice in that it is the number we end on rather than the number
+			//  of items to grab (length)
+
+			// Start must always be the actual starting number for this calculation (not negative)
+			$start = ($start < 0) ? sizeof($item) + $start : $start;
+			$end = $end - $start;
+		}
+
+		// We always include the last element (this was the past design)
+		$end = ($end == -1 || $end === null) ? null : $end + 1;
+
+		return twig_slice($env, $item, $start, $end, $preserveKeys);
+	}
+
+	/**
+	* Get output for a language variable (L_FOO, LA_FOO)
+	*
+	* This function checks to see if the language var was outputted to $context
+	* (e.g. in the ACP, L_TITLE)
+	* If not, we return the result of $user->lang()
+	*
+	* @return string
+	*/
+	function lang()
+	{
+		$args = func_get_args();
+		$key = $args[0];
+
+		$context = $this->context->get_data_ref();
+		$context_vars = $context['.'][0];
+
+		if (isset($context_vars['L_' . $key]))
+		{
+			return $context_vars['L_' . $key];
+		}
+
+		// LA_ is transformed into lang(\'$1\')|addslashes, so we should not
+		// need to check for it
+
+		return call_user_func_array(array($this->user, 'lang'), $args);
+	}
+}
diff --git a/phpBB/phpbb/template/twig/lexer.php b/phpBB/phpbb/template/twig/lexer.php
new file mode 100644
index 0000000000..c5dc7273ba
--- /dev/null
+++ b/phpBB/phpbb/template/twig/lexer.php
@@ -0,0 +1,354 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+class lexer extends \Twig_Lexer
+{
+	public function tokenize($code, $filename = null)
+	{
+		// Our phpBB tags
+		// Commented out tokens are handled separately from the main replace
+		$phpbb_tags = array(
+			/*'BEGIN',
+			'BEGINELSE',
+			'END',
+			'IF',
+			'ELSE',
+			'ELSEIF',
+			'ENDIF',
+			'DEFINE',
+			'UNDEFINE',*/
+			'ENDDEFINE',
+			'INCLUDE',
+			'INCLUDEPHP',
+			'INCLUDEJS',
+			'INCLUDECSS',
+			'PHP',
+			'ENDPHP',
+			'EVENT',
+		);
+
+		// Twig tag masks
+		$twig_tags = array(
+			'autoescape',
+			'endautoescape',
+			'if',
+			'elseif',
+			'else',
+			'endif',
+			'block',
+			'endblock',
+			'use',
+			'extends',
+			'embed',
+			'filter',
+			'endfilter',
+			'flush',
+			'for',
+			'endfor',
+			'macro',
+			'endmacro',
+			'import',
+			'from',
+			'sandbox',
+			'endsandbox',
+			'set',
+			'endset',
+			'spaceless',
+			'endspaceless',
+			'verbatim',
+			'endverbatim',
+		);
+
+		// Fix tokens that may have inline variables (e.g. <!-- DEFINE $TEST = '{FOO}')
+		$code = $this->strip_surrounding_quotes(array(
+			'INCLUDE',
+			'INCLUDEPHP',
+			'INCLUDEJS',
+			'INCLUDECSS',
+		), $code);
+		$code = $this->fix_inline_variable_tokens(array(
+			'DEFINE \$[a-zA-Z0-9_]+ =',
+			'INCLUDE',
+			'INCLUDEPHP',
+			'INCLUDEJS',
+			'INCLUDECSS',
+		), $code);
+		$code = $this->add_surrounding_quotes(array(
+			'INCLUDE',
+			'INCLUDEPHP',
+			'INCLUDEJS',
+			'INCLUDECSS',
+		), $code);
+
+		// Fix our BEGIN statements
+		$code = $this->fix_begin_tokens($code);
+
+		// Fix our IF tokens
+		$code = $this->fix_if_tokens($code);
+
+		// Fix our DEFINE tokens
+		$code = $this->fix_define_tokens($code);
+
+		// Replace all of our starting tokens, <!-- TOKEN --> with Twig style, {% TOKEN %}
+		// This also strips outer parenthesis, <!-- IF (blah) --> becomes <!-- IF blah -->
+		$code = preg_replace('#<!-- (' . implode('|', $phpbb_tags) . ')(?: (.*?) ?)?-->#', '{% $1 $2 %}', $code);
+
+		// Replace all of our twig masks with Twig code (e.g. <!-- BLOCK .+ --> with {% block $1 %})
+		$code = $this->replace_twig_tag_masks($code, $twig_tags);
+
+		// Replace all of our language variables, {L_VARNAME}, with Twig style, {{ lang('NAME') }}
+		// Appends any filters after lang()
+		$code = preg_replace('#{L_([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ lang(\'$1\')$2 }}', $code);
+
+		// Replace all of our escaped language variables, {LA_VARNAME}, with Twig style, {{ lang('NAME')|addslashes }}
+		// Appends any filters after lang(), but before addslashes
+		$code = preg_replace('#{LA_([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ lang(\'$1\')$2|addslashes }}', $code);
+
+		// Replace all of our variables, {VARNAME}, with Twig style, {{ VARNAME }}
+		// Appends any filters
+		$code = preg_replace('#{([a-zA-Z0-9_\.]+)(\|[^}]+?)?}#', '{{ $1$2 }}', $code);
+
+		return parent::tokenize($code, $filename);
+	}
+
+	/**
+	* Strip surrounding quotes
+	*
+	* First step to fix tokens that may have inline variables
+	* E.g. <!-- INCLUDE '{TEST}.html' to <!-- INCLUDE {TEST}.html
+	*
+	* @param array $tokens array of tokens to search for (imploded to a regular expression)
+	* @param string $code
+	* @return string
+	*/
+	protected function strip_surrounding_quotes($tokens, $code)
+	{
+		// Remove matching quotes at the beginning/end if a statement;
+		// E.g. 'asdf'"' -> asdf'"
+		// E.g. "asdf'"" -> asdf'"
+		// E.g. 'asdf'" -> 'asdf'"
+		return preg_replace('#<!-- (' . implode('|', $tokens) . ') (([\'"])?(.*?)\1) -->#', '<!-- $1 $2 -->', $code);
+	}
+
+	/**
+	* Fix tokens that may have inline variables
+	*
+	* Second step to fix tokens that may have inline variables
+	* E.g. <!-- INCLUDE '{TEST}.html' to <!-- INCLUDE ' ~ {TEST} ~ '.html
+	*
+	* @param array $tokens array of tokens to search for (imploded to a regular expression)
+	* @param string $code
+	* @return string
+	*/
+	protected function fix_inline_variable_tokens($tokens, $code)
+	{
+		$callback = function($matches)
+		{
+			// Replace template variables with start/end to parse variables (' ~ TEST ~ '.html)
+			$matches[2] = preg_replace('#{([a-zA-Z0-9_\.$]+)}#', "'~ \$1 ~'", $matches[2]);
+
+			return "<!-- {$matches[1]} {$matches[2]} -->";
+		};
+
+		return preg_replace_callback('#<!-- (' . implode('|', $tokens) . ') (.+?) -->#', $callback, $code);
+	}
+
+	/**
+	* Add surrounding quotes
+	*
+	* Last step to fix tokens that may have inline variables
+	* E.g. <!-- INCLUDE '{TEST}.html' to <!-- INCLUDE '' ~ {TEST} ~ '.html'
+	*
+	* @param array $tokens array of tokens to search for (imploded to a regular expression)
+	* @param string $code
+	* @return string
+	*/
+	protected function add_surrounding_quotes($tokens, $code)
+	{
+		return preg_replace('#<!-- (' . implode('|', $tokens) . ') (.+?) -->#', '<!-- $1 \'$2\' -->', $code);
+	}
+
+	/**
+	* Fix begin tokens (convert our BEGIN to Twig for)
+	*
+	* Not meant to be used outside of this context, public because the anonymous function calls this
+	*
+	* @param string $code
+	* @param array $parent_nodes (used in recursion)
+	* @return string
+	*/
+	public function fix_begin_tokens($code, $parent_nodes = array())
+	{
+		// PHP 5.3 cannot use $this in an anonymous function, so use this as a work-around
+		$parent_class = $this;
+		$callback = function ($matches) use ($parent_class, $parent_nodes)
+		{
+			$hard_parents = explode('.', $matches[1]);
+			array_pop($hard_parents); // ends with .
+			if ($hard_parents)
+			{
+				$parent_nodes = array_merge($hard_parents, $parent_nodes);
+			}
+
+			$name = $matches[2];
+			$subset = trim(substr($matches[3], 1, -1)); // Remove parenthesis
+			$body = $matches[4];
+
+			// Replace <!-- BEGINELSE -->
+			$body = str_replace('<!-- BEGINELSE -->', '{% else %}', $body);
+
+			// Is the designer wanting to call another loop in a loop?
+			// <!-- BEGIN loop -->
+			// <!-- BEGIN !loop2 -->
+			// <!-- END !loop2 -->
+			// <!-- END loop -->
+			// 'loop2' is actually on the same nesting level as 'loop' you assign
+			// variables to it with template->assign_block_vars('loop2', array(...))
+			if (strpos($name, '!') === 0)
+			{
+				// Count the number if ! occurrences
+				$count = substr_count($name, '!');
+				for ($i = 0; $i < $count; $i++)
+				{
+					array_pop($parent_nodes);
+					$name = substr($name, 1);
+				}
+			}
+
+			// Remove all parent nodes, e.g. foo, bar from foo.bar.foobar.VAR
+			foreach ($parent_nodes as $node)
+			{
+				$body = preg_replace('#([^a-zA-Z0-9_])' . $node . '\.([a-zA-Z0-9_]+)\.#', '$1$2.', $body);
+			}
+
+			// Add current node to list of parent nodes for child nodes
+			$parent_nodes[] = $name;
+
+			// Recursive...fix any child nodes
+			$body = $parent_class->fix_begin_tokens($body, $parent_nodes);
+
+			// Need the parent variable name
+			array_pop($parent_nodes);
+			$parent = (!empty($parent_nodes)) ? end($parent_nodes) . '.' : '';
+
+			if ($subset !== '')
+			{
+				$subset = '|subset(' . $subset . ')';
+			}
+
+			$parent = ($parent) ?: 'loops.';
+			// Turn into a Twig for loop
+			return "{% for {$name} in {$parent}{$name}{$subset} %}{$body}{% endfor %}";
+		};
+
+		return preg_replace_callback('#<!-- BEGIN ((?:[a-zA-Z0-9_]+\.)*)([!a-zA-Z0-9_]+)(\([0-9,\-]+\))? -->(.+?)<!-- END \1\2 -->#s', $callback, $code);
+	}
+
+	/**
+	* Fix IF statements
+	*
+	* @param string $code
+	* @return string
+	*/
+	protected function fix_if_tokens($code)
+	{
+		// Replace ELSE IF with ELSEIF
+		$code = preg_replace('#<!-- ELSE IF (.+?) -->#', '<!-- ELSEIF $1 -->', $code);
+
+		// Replace our "div by" with Twig's divisibleby (Twig does not like test names with spaces)
+		$code = preg_replace('# div by ([0-9]+)#', ' divisibleby($1)', $code);
+
+		$callback = function($matches)
+		{
+			$inner = $matches[2];
+			// Replace $TEST with definition.TEST
+			$inner = preg_replace('#(\s\(*!?)\$([a-zA-Z_0-9]+)#', '$1definition.$2', $inner);
+
+			// Replace .foo with loops.foo|length
+			$inner = preg_replace('#(\s\(*!?)\.([a-zA-Z_0-9]+)([^a-zA-Z_0-9\.])#', '$1loops.$2|length$3', $inner);
+
+			// Replace .foo.bar with foo.bar|length
+			$inner = preg_replace('#(\s\(*!?)\.([a-zA-Z_0-9\.]+)([^a-zA-Z_0-9\.])#', '$1$2|length$3', $inner);
+
+			return "<!-- {$matches[1]}IF{$inner}-->";
+		};
+
+		return preg_replace_callback('#<!-- (ELSE)?IF((.*?) (?:\(*!?[\$|\.]([^\s]+)(.*?))?)-->#', $callback, $code);
+	}
+
+	/**
+	* Fix DEFINE statements and {$VARNAME} variables
+	*
+	* @param string $code
+	* @return string
+	*/
+	protected function fix_define_tokens($code)
+	{
+		/**
+		* Changing $VARNAME to definition.varname because set is only local
+		* context (e.g. DEFINE $TEST will only make $TEST available in current
+		* template and any child templates, but not any parent templates).
+		*
+		* DEFINE handles setting it properly to definition in its node, but the
+		* variables reading FROM it need to be altered to definition.VARNAME
+		*
+		* Setting up definition as a class in the array passed to Twig
+		* ($context) makes set definition.TEST available in the global context
+		*/
+
+		// Replace <!-- DEFINE $NAME with {% DEFINE definition.NAME
+		$code = preg_replace('#<!-- DEFINE \$(.*?) -->#', '{% DEFINE $1 %}', $code);
+
+		// Changing UNDEFINE NAME to DEFINE NAME = null to save from creating an extra token parser/node
+		$code = preg_replace('#<!-- UNDEFINE \$(.*?)-->#', '{% DEFINE $1= null %}', $code);
+
+		// Replace all of our variables, {$VARNAME}, with Twig style, {{ definition.VARNAME }}
+		$code = preg_replace('#{\$([a-zA-Z0-9_\.]+)}#', '{{ definition.$1 }}', $code);
+
+		// Replace all of our variables, ~ $VARNAME ~, with Twig style, ~ definition.VARNAME ~
+		$code = preg_replace('#~ \$([a-zA-Z0-9_\.]+) ~#', '~ definition.$1 ~', $code);
+
+		return $code;
+	}
+
+	/**
+	* Replace Twig tag masks with Twig tag calls
+	*
+	* E.g. <!-- BLOCK foo --> with {% block foo %}
+	*
+	* @param string $code
+	* @param array $twig_tags All tags we want to create a mask for
+	* @return string
+	*/
+	protected function replace_twig_tag_masks($code, $twig_tags)
+	{
+		$callback = function ($matches)
+		{
+			$matches[1] = strtolower($matches[1]);
+
+			return "{% {$matches[1]}{$matches[2]}%}";
+		};
+
+		foreach ($twig_tags as &$tag)
+		{
+			$tag = strtoupper($tag);
+		}
+
+		// twig_tags is an array of the twig tags, which are all lowercase, but we use all uppercase tags
+		$code = preg_replace_callback('#<!-- (' . implode('|', $twig_tags) . ')(.*?)-->#',$callback, $code);
+
+		return $code;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/loader.php b/phpBB/phpbb/template/twig/loader.php
new file mode 100644
index 0000000000..2f8ffaa776
--- /dev/null
+++ b/phpBB/phpbb/template/twig/loader.php
@@ -0,0 +1,147 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+/**
+* Twig Template loader
+*/
+class loader extends \Twig_Loader_Filesystem
+{
+	protected $safe_directories = array();
+
+	/**
+	* Set safe directories
+	*
+	* @param array $directories Array of directories that are safe (empty to clear)
+	* @return \Twig_Loader_Filesystem
+	*/
+	public function setSafeDirectories($directories = array())
+	{
+		$this->safe_directories = array();
+
+		if (!empty($directories))
+		{
+			foreach ($directories as $directory)
+			{
+				$this->addSafeDirectory($directory);
+			}
+		}
+
+		return $this;
+	}
+
+	/**
+	* Add safe directory
+	*
+	* @param string $directory Directory that should be added
+	* @return \Twig_Loader_Filesystem
+	*/
+	public function addSafeDirectory($directory)
+	{
+		$directory = phpbb_realpath($directory);
+
+		if ($directory !== false)
+		{
+			$this->safe_directories[] = $directory;
+		}
+
+		return $this;
+	}
+
+	/**
+	* Get current safe directories
+	*
+	* @return array
+	*/
+	public function getSafeDirectories()
+	{
+		return $this->safe_directories;
+	}
+
+	/**
+	* Override for parent::validateName()
+	*
+	* This is done because we added support for safe directories, and when Twig
+	*	findTemplate() is called, validateName() is called first, which would
+	*	always throw an exception if the file is outside of the configured
+	*	template directories.
+	*/
+	protected function validateName($name)
+	{
+		return;
+	}
+
+	/**
+	* Find the template
+	*
+	* Override for Twig_Loader_Filesystem::findTemplate to add support
+	*	for loading from safe directories.
+	*/
+	protected function findTemplate($name)
+	{
+		$name = (string) $name;
+
+		// normalize name
+		$name = preg_replace('#/{2,}#', '/', strtr($name, '\\', '/'));
+
+		// If this is in the cache we can skip the entire process below
+		//	as it should have already been validated
+		if (isset($this->cache[$name])) {
+			return $this->cache[$name];
+		}
+
+		// First, find the template name. The override above of validateName
+		//	causes the validateName process to be skipped for this call
+		$file = parent::findTemplate($name);
+
+		try
+		{
+			// Try validating the name (which may throw an exception)
+			parent::validateName($name);
+		}
+		catch (\Twig_Error_Loader $e)
+		{
+			if (strpos($e->getRawMessage(), 'Looks like you try to load a template outside configured directories') === 0)
+			{
+				// Ok, so outside of the configured template directories, we
+				//	can now check if we're within a "safe" directory
+
+				// Find the real path of the directory the file is in
+				$directory = phpbb_realpath(dirname($file));
+
+				if ($directory === false)
+				{
+					// Some sort of error finding the actual path, must throw the exception
+					throw $e;
+				}
+
+				foreach ($this->safe_directories as $safe_directory)
+				{
+					if (strpos($directory, $safe_directory) === 0)
+					{
+						// The directory being loaded is below a directory
+						// that is "safe". We're good to load it!
+						return $file;
+					}
+				}
+			}
+
+			// Not within any safe directories
+			throw $e;
+		}
+
+		// No exception from validateName, safe to load.
+		return $file;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/definenode.php b/phpBB/phpbb/template/twig/node/definenode.php
new file mode 100644
index 0000000000..695ec4281f
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/definenode.php
@@ -0,0 +1,57 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @copyright Portions (c) 2009 Fabien Potencier, Armin Ronacher
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+
+class definenode extends \Twig_Node
+{
+	public function __construct($capture, \Twig_NodeInterface $name, \Twig_NodeInterface $value, $lineno, $tag = null)
+	{
+		parent::__construct(array('name' => $name, 'value' => $value), array('capture' => $capture, 'safe' => false), $lineno, $tag);
+	}
+
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		if ($this->getAttribute('capture')) {
+			$compiler
+				->write("ob_start();\n")
+				->subcompile($this->getNode('value'))
+			;
+
+			$compiler->write("\$value = ('' === \$value = ob_get_clean()) ? '' : new \Twig_Markup(\$value, \$this->env->getCharset());\n");
+		}
+		else
+		{
+			$compiler
+				->write("\$value = ")
+				->subcompile($this->getNode('value'))
+				->raw(";\n")
+			;
+		}
+
+		$compiler
+			->write("\$context['definition']->set('")
+			->raw($this->getNode('name')->getAttribute('name'))
+			->raw("', \$value);\n")
+		;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/event.php b/phpBB/phpbb/template/twig/node/event.php
new file mode 100644
index 0000000000..8fc4ba4775
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/event.php
@@ -0,0 +1,83 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+
+class event extends \Twig_Node
+{
+	/**
+	* The subdirectory in which all template listener files must be placed
+	* @var string
+	*/
+	protected $listener_directory = 'event/';
+
+	/** @var \Twig_Environment */
+	protected $environment;
+
+	public function __construct(\Twig_Node_Expression $expr, \phpbb\template\twig\environment $environment, $lineno, $tag = null)
+	{
+		$this->environment = $environment;
+
+		parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+	}
+
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		$location = $this->listener_directory . $this->getNode('expr')->getAttribute('name');
+
+		foreach ($this->environment->get_phpbb_extensions() as $ext_namespace => $ext_path)
+		{
+			$ext_namespace = str_replace('/', '_', $ext_namespace);
+
+			if (defined('DEBUG'))
+			{
+				// If debug mode is enabled, lets check for new/removed EVENT
+				//  templates on page load rather than at compile. This is
+				//  slower, but makes developing extensions easier (no need to
+				//  purge the cache when a new event template file is added)
+				$compiler
+					->write("if (\$this->env->getLoader()->exists('@{$ext_namespace}/{$location}.html')) {\n")
+					->indent()
+				;
+			}
+
+			if (defined('DEBUG') || $this->environment->getLoader()->exists('@' . $ext_namespace . '/' . $location . '.html'))
+			{
+				$compiler
+					->write("\$previous_look_up_order = \$this->env->getNamespaceLookUpOrder();\n")
+
+					// We set the namespace lookup order to be this extension first, then the main path
+					->write("\$this->env->setNamespaceLookUpOrder(array('{$ext_namespace}', '__main__'));\n")
+					->write("\$this->env->loadTemplate('@{$ext_namespace}/{$location}.html')->display(\$context);\n")
+					->write("\$this->env->setNamespaceLookUpOrder(\$previous_look_up_order);\n")
+				;
+			}
+
+			if (defined('DEBUG'))
+			{
+				$compiler
+					->outdent()
+					->write("}\n\n")
+				;
+			}
+		}
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/expression/binary/equalequal.php b/phpBB/phpbb/template/twig/node/expression/binary/equalequal.php
new file mode 100644
index 0000000000..8c7f7b378d
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/expression/binary/equalequal.php
@@ -0,0 +1,23 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node\expression\binary;
+
+
+class equalequal extends \Twig_Node_Expression_Binary
+{
+	public function operator(\Twig_Compiler $compiler)
+	{
+		return $compiler->raw('===');
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/expression/binary/notequalequal.php b/phpBB/phpbb/template/twig/node/expression/binary/notequalequal.php
new file mode 100644
index 0000000000..2e95c68090
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/expression/binary/notequalequal.php
@@ -0,0 +1,23 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node\expression\binary;
+
+
+class notequalequal extends \Twig_Node_Expression_Binary
+{
+	public function operator(\Twig_Compiler $compiler)
+	{
+		return $compiler->raw('!==');
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/includeasset.php b/phpBB/phpbb/template/twig/node/includeasset.php
new file mode 100644
index 0000000000..15195a226b
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/includeasset.php
@@ -0,0 +1,81 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+abstract class includeasset extends \Twig_Node
+{
+	/** @var \Twig_Environment */
+	protected $environment;
+
+	public function __construct(\Twig_Node_Expression $expr, \phpbb\template\twig\environment $environment, $lineno, $tag = null)
+	{
+		$this->environment = $environment;
+
+		parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+	}
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		$config = $this->environment->get_phpbb_config();
+
+		$compiler
+			->write("\$asset_file = ")
+			->subcompile($this->getNode('expr'))
+			->raw(";\n")
+			->write("\$asset = new \phpbb\\template\\asset(\$asset_file, \$this->getEnvironment()->get_path_helper());\n")
+			->write("if (substr(\$asset_file, 0, 2) !== './' && \$asset->is_relative()) {\n")
+			->indent()
+				->write("\$asset_path = \$asset->get_path();")
+				->write("\$local_file = \$this->getEnvironment()->get_phpbb_root_path() . \$asset_path;\n")
+				->write("if (!file_exists(\$local_file)) {\n")
+				->indent()
+					->write("\$local_file = \$this->getEnvironment()->findTemplate(\$asset_path);\n")
+					->write("\$asset->set_path(\$local_file, true);\n")
+				->outdent()
+				->write("\$asset->add_assets_version('{$config['assets_version']}');\n")
+				->write("\$asset_file = \$asset->get_url();\n")
+				->write("}\n")
+			->outdent()
+			->write("}\n")
+			->write("\$context['definition']->append('{$this->get_definition_name()}', '")
+		;
+
+		$this->append_asset($compiler);
+
+		$compiler
+			->raw("\n');\n")
+		;
+	}
+
+	/**
+	* Get the definition name
+	*
+	* @return string (e.g. 'SCRIPTS')
+	*/
+	abstract public function get_definition_name();
+
+	/**
+	* Append the output code for the asset
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	* @return null
+	*/
+	abstract protected function append_asset(\Twig_Compiler $compiler);
+}
diff --git a/phpBB/phpbb/template/twig/node/includecss.php b/phpBB/phpbb/template/twig/node/includecss.php
new file mode 100644
index 0000000000..2ce63402aa
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/includecss.php
@@ -0,0 +1,37 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+class includecss extends \phpbb\template\twig\node\includeasset
+{
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_definition_name()
+	{
+		return 'STYLESHEETS';
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function append_asset(\Twig_Compiler $compiler)
+	{
+		$compiler
+			->raw("<link href=\"' . ")
+			->raw("\$asset_file . '\"")
+			->raw(' rel="stylesheet" type="text/css" media="screen, projection" />')
+		;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/includejs.php b/phpBB/phpbb/template/twig/node/includejs.php
new file mode 100644
index 0000000000..0f67f9ff60
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/includejs.php
@@ -0,0 +1,39 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+class includejs extends \phpbb\template\twig\node\includeasset
+{
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_definition_name()
+	{
+		return 'SCRIPTS';
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	protected function append_asset(\Twig_Compiler $compiler)
+	{
+		$config = $this->environment->get_phpbb_config();
+
+		$compiler
+			->raw("<script type=\"text/javascript\" src=\"' . ")
+			->raw("\$asset_file")
+			->raw(". '\"></script>\n")
+		;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/includenode.php b/phpBB/phpbb/template/twig/node/includenode.php
new file mode 100644
index 0000000000..42428b6106
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/includenode.php
@@ -0,0 +1,54 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+
+class includenode extends \Twig_Node_Include
+{
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		$compiler
+			->write("\$location = ")
+			->subcompile($this->getNode('expr'))
+			->raw(";\n")
+			->write("\$namespace = false;\n")
+			->write("if (strpos(\$location, '@') === 0) {\n")
+			->indent()
+				->write("\$namespace = substr(\$location, 1, strpos(\$location, '/') - 1);\n")
+				->write("\$previous_look_up_order = \$this->env->getNamespaceLookUpOrder();\n")
+
+				// We set the namespace lookup order to be this namespace first, then the main path
+				->write("\$this->env->setNamespaceLookUpOrder(array(\$namespace, '__main__'));\n")
+			->outdent()
+			->write("}\n")
+		;
+
+		parent::compile($compiler);
+
+		$compiler
+			->write("if (\$namespace) {\n")
+			->indent()
+				->write("\$this->env->setNamespaceLookUpOrder(\$previous_look_up_order);\n")
+			->outdent()
+			->write("}\n")
+		;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/includephp.php b/phpBB/phpbb/template/twig/node/includephp.php
new file mode 100644
index 0000000000..826617e8e8
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/includephp.php
@@ -0,0 +1,90 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* Sections (c) 2009 Fabien Potencier, Armin Ronacher
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+
+class includephp extends \Twig_Node
+{
+	/** @var \Twig_Environment */
+	protected $environment;
+
+	public function __construct(\Twig_Node_Expression $expr, \phpbb\template\twig\environment $environment, $lineno, $ignoreMissing = false, $tag = null)
+	{
+		$this->environment = $environment;
+
+		parent::__construct(array('expr' => $expr), array('ignore_missing' => (Boolean) $ignoreMissing), $lineno, $tag);
+	}
+
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		$config = $this->environment->get_phpbb_config();
+
+		if (!$config['tpl_allow_php'])
+		{
+			$compiler
+				->write("// INCLUDEPHP Disabled\n")
+			;
+
+			return;
+		}
+
+		if ($this->getAttribute('ignore_missing')) {
+			$compiler
+				->write("try {\n")
+				->indent()
+			;
+		}
+
+		$compiler
+			->write("\$location = ")
+			->subcompile($this->getNode('expr'))
+			->raw(";\n")
+			->write("if (phpbb_is_absolute(\$location)) {\n")
+			->indent()
+				// Absolute path specified
+				->write("require(\$location);\n")
+			->outdent()
+			->write("} else if (file_exists(\$this->getEnvironment()->get_phpbb_root_path() . \$location)) {\n")
+			->indent()
+				// PHP file relative to phpbb_root_path
+				->write("require(\$this->getEnvironment()->get_phpbb_root_path() . \$location);\n")
+			->outdent()
+			->write("} else {\n")
+			->indent()
+				// Local path (behaves like INCLUDE)
+				->write("require(\$this->getEnvironment()->getLoader()->getCacheKey(\$location));\n")
+			->outdent()
+			->write("}\n")
+		;
+
+		if ($this->getAttribute('ignore_missing')) {
+			$compiler
+				->outdent()
+				->write("} catch (\Twig_Error_Loader \$e) {\n")
+				->indent()
+				->write("// ignore missing template\n")
+				->outdent()
+				->write("}\n\n")
+			;
+		}
+	}
+}
diff --git a/phpBB/phpbb/template/twig/node/php.php b/phpBB/phpbb/template/twig/node/php.php
new file mode 100644
index 0000000000..3a24513dca
--- /dev/null
+++ b/phpBB/phpbb/template/twig/node/php.php
@@ -0,0 +1,53 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\node;
+
+
+class php extends \Twig_Node
+{
+	/** @var \Twig_Environment */
+	protected $environment;
+
+	public function __construct(\Twig_Node_Text $text, \phpbb\template\twig\environment $environment, $lineno, $tag = null)
+	{
+		$this->environment = $environment;
+
+		parent::__construct(array('text' => $text), array(), $lineno, $tag);
+	}
+
+	/**
+	* Compiles the node to PHP.
+	*
+	* @param \Twig_Compiler A Twig_Compiler instance
+	*/
+	public function compile(\Twig_Compiler $compiler)
+	{
+		$compiler->addDebugInfo($this);
+
+		$config = $this->environment->get_phpbb_config();
+
+		if (!$config['tpl_allow_php'])
+		{
+			$compiler
+				->write("// PHP Disabled\n")
+			;
+
+			return;
+		}
+
+		$compiler
+			->raw($this->getNode('text')->getAttribute('data'))
+		;
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/defineparser.php b/phpBB/phpbb/template/twig/tokenparser/defineparser.php
new file mode 100644
index 0000000000..cfee84a363
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/defineparser.php
@@ -0,0 +1,74 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @copyright Portions (c) 2009 Fabien Potencier, Armin Ronacher
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class defineparser extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	* @throws \Twig_Error_Syntax
+	* @throws \phpbb\template\twig\node\definenode
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$lineno = $token->getLine();
+		$stream = $this->parser->getStream();
+		$name = $this->parser->getExpressionParser()->parseExpression();
+
+		$capture = false;
+		if ($stream->test(\Twig_Token::OPERATOR_TYPE, '=')) {
+			$stream->next();
+			$value = $this->parser->getExpressionParser()->parseExpression();
+
+			if ($value instanceof \Twig_Node_Expression_Name)
+			{
+				// This would happen if someone improperly formed their DEFINE syntax
+				// e.g. <!-- DEFINE $VAR = foo -->
+				throw new \Twig_Error_Syntax('Invalid DEFINE', $token->getLine(), $this->parser->getFilename());
+			}
+
+			$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+		} else {
+			$capture = true;
+
+			$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+			$value = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+			$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+		}
+
+		return new \phpbb\template\twig\node\definenode($capture, $name, $value, $lineno, $this->getTag());
+	}
+
+	public function decideBlockEnd(\Twig_Token $token)
+	{
+		return $token->test('ENDDEFINE');
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'DEFINE';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/event.php b/phpBB/phpbb/template/twig/tokenparser/event.php
new file mode 100644
index 0000000000..4c7c8e07d9
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/event.php
@@ -0,0 +1,45 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class event extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$expr = $this->parser->getExpressionParser()->parseExpression();
+
+		$stream = $this->parser->getStream();
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		return new \phpbb\template\twig\node\event($expr, $this->parser->getEnvironment(), $token->getLine(), $this->getTag());
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'EVENT';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/includecss.php b/phpBB/phpbb/template/twig/tokenparser/includecss.php
new file mode 100644
index 0000000000..1f30811754
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/includecss.php
@@ -0,0 +1,44 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+class includecss extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$expr = $this->parser->getExpressionParser()->parseExpression();
+
+		$stream = $this->parser->getStream();
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		return new \phpbb\template\twig\node\includecss($expr, $this->parser->getEnvironment(), $token->getLine(), $this->getTag());
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'INCLUDECSS';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/includejs.php b/phpBB/phpbb/template/twig/tokenparser/includejs.php
new file mode 100644
index 0000000000..4156048e42
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/includejs.php
@@ -0,0 +1,45 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class includejs extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$expr = $this->parser->getExpressionParser()->parseExpression();
+
+		$stream = $this->parser->getStream();
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		return new \phpbb\template\twig\node\includejs($expr, $this->parser->getEnvironment(), $token->getLine(), $this->getTag());
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'INCLUDEJS';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/includeparser.php b/phpBB/phpbb/template/twig/tokenparser/includeparser.php
new file mode 100644
index 0000000000..6ee78e5562
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/includeparser.php
@@ -0,0 +1,45 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @copyright Portions (c) 2009 Fabien Potencier, Armin Ronacher
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class includeparser extends \Twig_TokenParser_Include
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$expr = $this->parser->getExpressionParser()->parseExpression();
+
+		list($variables, $only, $ignoreMissing) = $this->parseArguments();
+
+		return new \phpbb\template\twig\node\includenode($expr, $variables, $only, $ignoreMissing, $token->getLine(), $this->getTag());
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'INCLUDE';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/includephp.php b/phpBB/phpbb/template/twig/tokenparser/includephp.php
new file mode 100644
index 0000000000..38196c5290
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/includephp.php
@@ -0,0 +1,55 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @copyright Portions (c) 2009 Fabien Potencier, Armin Ronacher
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class includephp extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$expr = $this->parser->getExpressionParser()->parseExpression();
+
+		$stream = $this->parser->getStream();
+
+		$ignoreMissing = false;
+		if ($stream->test(\Twig_Token::NAME_TYPE, 'ignore')) {
+			$stream->next();
+			$stream->expect(\Twig_Token::NAME_TYPE, 'missing');
+
+			$ignoreMissing = true;
+		}
+
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		return new \phpbb\template\twig\node\includephp($expr, $this->parser->getEnvironment(), $token->getLine(), $ignoreMissing, $this->getTag());
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'INCLUDEPHP';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/tokenparser/php.php b/phpBB/phpbb/template/twig/tokenparser/php.php
new file mode 100644
index 0000000000..557a70cca1
--- /dev/null
+++ b/phpBB/phpbb/template/twig/tokenparser/php.php
@@ -0,0 +1,53 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig\tokenparser;
+
+
+class php extends \Twig_TokenParser
+{
+	/**
+	* Parses a token and returns a node.
+	*
+	* @param \Twig_Token $token A Twig_Token instance
+	*
+	* @return \Twig_NodeInterface A Twig_NodeInterface instance
+	*/
+	public function parse(\Twig_Token $token)
+	{
+		$stream = $this->parser->getStream();
+
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		$body = $this->parser->subparse(array($this, 'decideEnd'), true);
+
+		$stream->expect(\Twig_Token::BLOCK_END_TYPE);
+
+		return new \phpbb\template\twig\node\php($body, $this->parser->getEnvironment(), $token->getLine(), $this->getTag());
+	}
+
+	public function decideEnd(\Twig_Token $token)
+	{
+		return $token->test('ENDPHP');
+	}
+
+	/**
+	* Gets the tag name associated with this token parser.
+	*
+	* @return string The tag name
+	*/
+	public function getTag()
+	{
+		return 'PHP';
+	}
+}
diff --git a/phpBB/phpbb/template/twig/twig.php b/phpBB/phpbb/template/twig/twig.php
new file mode 100644
index 0000000000..a3b002f350
--- /dev/null
+++ b/phpBB/phpbb/template/twig/twig.php
@@ -0,0 +1,360 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template\twig;
+
+/**
+* Twig Template class.
+*/
+class twig extends \phpbb\template\base
+{
+	/**
+	* Path of the cache directory for the template
+	*
+	* Cannot be changed during runtime.
+	*
+	* @var string
+	*/
+	private $cachepath = '';
+
+	/**
+	* phpBB path helper
+	* @var \phpbb\path_helper
+	*/
+	protected $path_helper;
+
+	/**
+	* phpBB root path
+	* @var string
+	*/
+	protected $phpbb_root_path;
+
+	/**
+	* PHP file extension
+	* @var string
+	*/
+	protected $php_ext;
+
+	/**
+	* phpBB config instance
+	* @var \phpbb\config\config
+	*/
+	protected $config;
+
+	/**
+	* Current user
+	* @var \phpbb\user
+	*/
+	protected $user;
+
+	/**
+	* Extension manager.
+	*
+	* @var \phpbb\extension\manager
+	*/
+	protected $extension_manager;
+
+	/**
+	* Twig Environment
+	*
+	* @var \Twig_Environment
+	*/
+	protected $twig;
+
+	/**
+	* Constructor.
+	*
+	* @param \phpbb\path_helper $path_helper
+	* @param \phpbb\config\config $config
+	* @param \phpbb\user $user
+	* @param \phpbb\template\context $context template context
+	* @param \phpbb\extension\manager $extension_manager extension manager, if null then template events will not be invoked
+	*/
+	public function __construct(\phpbb\path_helper $path_helper, $config, $user, \phpbb\template\context $context, \phpbb\extension\manager $extension_manager = null)
+	{
+		$this->path_helper = $path_helper;
+		$this->phpbb_root_path = $path_helper->get_phpbb_root_path();
+		$this->php_ext = $path_helper->get_php_ext();
+		$this->config = $config;
+		$this->user = $user;
+		$this->context = $context;
+		$this->extension_manager = $extension_manager;
+
+		$this->cachepath = $this->phpbb_root_path . 'cache/twig/';
+
+		// Initiate the loader, __main__ namespace paths will be setup later in set_style_names()
+		$loader = new \phpbb\template\twig\loader('');
+
+		$this->twig = new \phpbb\template\twig\environment(
+			$this->config,
+			$this->path_helper,
+			$this->extension_manager,
+			$loader,
+			array(
+				'cache'			=> (defined('IN_INSTALL')) ? false : $this->cachepath,
+				'debug'			=> defined('DEBUG'),
+				'auto_reload'	=> (bool) $this->config['load_tplcompile'],
+				'autoescape'	=> false,
+			)
+		);
+
+		$this->twig->addExtension(
+			new \phpbb\template\twig\extension(
+				$this->context,
+				$this->user
+			)
+		);
+
+		$lexer = new \phpbb\template\twig\lexer($this->twig);
+
+		$this->twig->setLexer($lexer);
+
+		// Add admin namespace
+		if ($this->path_helper->get_adm_relative_path() !== null && is_dir($this->phpbb_root_path . $this->path_helper->get_adm_relative_path() . 'style/'))
+		{
+			$this->twig->getLoader()->setPaths($this->phpbb_root_path . $this->path_helper->get_adm_relative_path() . 'style/', 'admin');
+		}
+	}
+
+	/**
+	* Clear the cache
+	*
+	* @return \phpbb\template\template
+	*/
+	public function clear_cache()
+	{
+		if (is_dir($this->cachepath))
+		{
+			$this->twig->clearCacheFiles();
+		}
+
+		return $this;
+	}
+
+	/**
+	* Get the style tree of the style preferred by the current user
+	*
+	* @return array Style tree, most specific first
+	*/
+	public function get_user_style()
+	{
+		$style_list = array(
+			$this->user->style['style_path'],
+		);
+
+		if ($this->user->style['style_parent_id'])
+		{
+			$style_list = array_merge($style_list, array_reverse(explode('/', $this->user->style['style_parent_tree'])));
+		}
+
+		return $style_list;
+	}
+
+	/**
+	* Set style location based on (current) user's chosen style.
+	*
+	* @param array $style_directories The directories to add style paths for
+	* 	E.g. array('ext/foo/bar/styles', 'styles')
+	* 	Default: array('styles') (phpBB's style directory)
+	* @return \phpbb\template\template $this
+	*/
+	public function set_style($style_directories = array('styles'))
+	{
+		if ($style_directories !== array('styles') && $this->twig->getLoader()->getPaths('core') === array())
+		{
+			// We should set up the core styles path since not already setup
+			$this->set_style();
+		}
+
+		$names = $this->get_user_style();
+		// Add 'all' folder to $names array
+		//	It allows extensions to load a template file from 'all' folder,
+		//	if a style doesn't include it.
+		$names[] = 'all';
+
+		$paths = array();
+		foreach ($style_directories as $directory)
+		{
+			foreach ($names as $name)
+			{
+				$path = $this->phpbb_root_path . trim($directory, '/') . "/{$name}/";
+				$template_path = $path . 'template/';
+
+				if (is_dir($template_path))
+				{
+					// Add the base style directory as a safe directory
+					$this->twig->getLoader()->addSafeDirectory($path);
+
+					$paths[] = $template_path;
+				}
+			}
+		}
+
+		// If we're setting up the main phpBB styles directory and the core
+		// namespace isn't setup yet, we will set it up now
+		if ($style_directories === array('styles') && $this->twig->getLoader()->getPaths('core') === array())
+		{
+			// Set up the core style paths namespace
+			$this->twig->getLoader()->setPaths($paths, 'core');
+		}
+
+		$this->set_custom_style($names, $paths);
+
+		return $this;
+	}
+
+	/**
+	* Set custom style location (able to use directory outside of phpBB).
+	*
+	* Note: Templates are still compiled to phpBB's cache directory.
+	*
+	* @param string|array $names Array of names (or detailed names) or string of name of template(s) in inheritance tree order, used by extensions.
+	*	E.g. array(
+	*			'name' 		=> 'adm',
+	*			'ext_path' 	=> 'adm/style/',
+	*		)
+	* @param string|array of string $paths Array of style paths, relative to current root directory
+	* @return \phpbb\template\template $this
+	*/
+	public function set_custom_style($names, $paths)
+	{
+		$paths = (is_string($paths)) ? array($paths) : $paths;
+		$names = (is_string($names)) ? array($names) : $names;
+
+		// Set as __main__ namespace
+		$this->twig->getLoader()->setPaths($paths);
+
+		// Add all namespaces for all extensions
+		if ($this->extension_manager instanceof \phpbb\extension\manager)
+		{
+			$names[] = 'all';
+
+			foreach ($this->extension_manager->all_enabled() as $ext_namespace => $ext_path)
+			{
+				// namespaces cannot contain /
+				$namespace = str_replace('/', '_', $ext_namespace);
+				$paths = array();
+
+				foreach ($names as $template_dir)
+				{
+					if (is_array($template_dir))
+					{
+						if (isset($template_dir['ext_path']))
+						{
+							$ext_style_template_path = $ext_path . $template_dir['ext_path'];
+							$ext_style_path = dirname($ext_style_template_path);
+						}
+						else
+						{
+							$ext_style_path = $ext_path . 'styles/' . $template_dir['name'] . '/';
+							$ext_style_template_path = $ext_style_path . 'template/';
+						}
+					}
+					else
+					{
+						$ext_style_path = $ext_path . 'styles/' . $template_dir . '/';
+						$ext_style_template_path = $ext_style_path . 'template/';
+					}
+
+					if (is_dir($ext_style_template_path))
+					{
+						// Add the base style directory as a safe directory
+						$this->twig->getLoader()->addSafeDirectory($ext_style_path);
+
+						$paths[] = $ext_style_template_path;
+					}
+				}
+
+				$this->twig->getLoader()->setPaths($paths, $namespace);
+			}
+		}
+
+		return $this;
+	}
+
+	/**
+	* Display a template for provided handle.
+	*
+	* The template will be loaded and compiled, if necessary, first.
+	*
+	* This function calls hooks.
+	*
+	* @param string $handle Handle to display
+	* @return \phpbb\template\template $this
+	*/
+	public function display($handle)
+	{
+		$result = $this->call_hook($handle, __FUNCTION__);
+		if ($result !== false)
+		{
+			return $result[0];
+		}
+
+		$this->twig->display($this->get_filename_from_handle($handle), $this->get_template_vars());
+
+		return $this;
+	}
+
+	/**
+	* Display the handle and assign the output to a template variable
+	* or return the compiled result.
+	*
+	* @param string $handle Handle to operate on
+	* @param string $template_var Template variable to assign compiled handle to
+	* @param bool $return_content If true return compiled handle, otherwise assign to $template_var
+	* @return \phpbb\template\template|string if $return_content is true return string of the compiled handle, otherwise return $this
+	*/
+	public function assign_display($handle, $template_var = '', $return_content = true)
+	{
+		if ($return_content)
+		{
+			return $this->twig->render($this->get_filename_from_handle($handle), $this->get_template_vars());
+		}
+
+		$this->assign_var($template_var, $this->twig->render($this->get_filename_from_handle($handle, $this->get_template_vars())));
+
+		return $this;
+	}
+
+	/**
+	* Get template vars in a format Twig will use (from the context)
+	*
+	* @return array
+	*/
+	protected function get_template_vars()
+	{
+		$context_vars = $this->context->get_data_ref();
+
+		$vars = array_merge(
+			$context_vars['.'][0], // To get normal vars
+			array(
+				'definition'	=> new \phpbb\template\twig\definition(),
+				'user'			=> $this->user,
+				'loops'			=> $context_vars, // To get loops
+			)
+		);
+
+		// cleanup
+		unset($vars['loops']['.']);
+
+		return $vars;
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_source_file_for_handle($handle)
+	{
+		return $this->twig->getLoader()->getCacheKey($this->get_filename_from_handle($handle));
+	}
+}