1 files changed, 309 insertions, 0 deletions
diff --git a/phpBB/phpbb/template/twig/lexer.php b/phpBB/phpbb/template/twig/lexer.php
new file mode 100644
index 0000000000..16a693cd7c
--- /dev/null
+++ b/phpBB/phpbb/template/twig/lexer.php
@@ -0,0 +1,309 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2013 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+class phpbb_template_twig_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->fix_inline_variable_tokens(array(
+			'DEFINE \$[a-zA-Z0-9_]+ =',
+			'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);
+	}
+
+	/**
+	* Fix tokens that may have inline variables
+	*
+	* E.g. <!-- 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)
+		{
+			// Remove matching quotes at the beginning/end if a statement;
+			// E.g. 'asdf'"' -> asdf'"
+			// E.g. "asdf'"" -> asdf'"
+			// E.g. 'asdf'" -> 'asdf'"
+			$matches[2] = preg_replace('#^([\'"])?(.*?)\1$#', '$2', $matches[2]);
+
+			// Replace template variables with start/end to parse variables (' ~ TEST ~ '.html)
+			$matches[2] = preg_replace('#{([a-zA-Z0-9_\.$]+)}#', "'~ \$1 ~'", $matches[2]);
+
+			// Surround the matches in single quotes ('' ~ TEST ~ '.html')
+			return "<!-- {$matches[1]} '{$matches[2]}' -->";
+		};
+
+		return preg_replace_callback('#<!-- (' . implode('|', $tokens) . ') (.+?) -->#', $callback, $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)
+		{
+			$name = $matches[1];
+			$subset = trim(substr($matches[2], 1, -1)); // Remove parenthesis
+			$body = $matches[3];
+
+			// 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_]+)(\([0-9,\-]+\))? -->(.+?)<!-- END \1 -->#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;
+	}
+}