4 files changed, 235 insertions, 91 deletions
diff --git a/phpBB/includes/template/compile.php b/phpBB/includes/template/compile.php
index 82b301c1a2..fcdaf7abda 100644
--- a/phpBB/includes/template/compile.php
+++ b/phpBB/includes/template/compile.php
@@ -35,16 +35,23 @@ class phpbb_template_compile
 	/**
 	* Constructor.
 	*
-	* @param bool @allow_php Whether PHP code will be allowed in templates (inline PHP code, PHP tag and INCLUDEPHP tag)
+	* @param bool $allow_php Whether PHP code will be allowed in templates (inline PHP code, PHP tag and INCLUDEPHP tag)
+	* @param array $style_names Name of style to which the template being compiled belongs and parents in style tree order
 	* @param phpbb_style_resource_locator $locator Resource locator
 	* @param string $phpbb_root_path Path to phpBB root directory
+	* @param phpbb_extension_manager $extension_manager Extension manager to use for finding template fragments in extensions; if null, template events will not be invoked
+	* @param phpbb_user $user Current user
 	*/
-	public function __construct($allow_php, $locator, $phpbb_root_path)
+	public function __construct($allow_php, $style_names, $locator, $phpbb_root_path, $extension_manager = null, $user = null)
 	{
 		$this->filter_params = array(
 			'allow_php'	=> $allow_php,
+			'style_names'	=> $style_names,
 			'locator'	=> $locator,
-			'phpbb_root_path'	=> $phpbb_root_path
+			'phpbb_root_path'	=> $phpbb_root_path,
+			'extension_manager'	=> $extension_manager,
+			'user'          => $user,
+			'template_compile'	=> $this,
 		);
 	}
 
@@ -58,6 +65,9 @@ class phpbb_template_compile
 	*/
 	public function compile_file_to_file($source_file, $compiled_file)
 	{
+		$lock = new phpbb_lock_flock($compiled_file);
+		$lock->acquire();
+
 		$source_handle = @fopen($source_file, 'rb');
 		$destination_handle = @fopen($compiled_file, 'wb');
 
@@ -66,16 +76,15 @@ class phpbb_template_compile
 			return false;
 		}
 
-		@flock($destination_handle, LOCK_EX);
-
 		$this->compile_stream_to_stream($source_handle, $destination_handle);
 
 		@fclose($source_handle);
-		@flock($destination_handle, LOCK_UN);
 		@fclose($destination_handle);
 
 		phpbb_chmod($compiled_file, CHMOD_READ | CHMOD_WRITE);
 
+		$lock->release();
+
 		clearstatcache();
 
 		return true;
@@ -118,7 +127,7 @@ class phpbb_template_compile
 	*
 	* @param resource $source_stream Source stream
 	* @param resource $dest_stream Destination stream
-	* @return void
+	* @return null
 	*/
 	private function compile_stream_to_stream($source_stream, $dest_stream)
 	{
diff --git a/phpBB/includes/template/filter.php b/phpBB/includes/template/filter.php
index 66d28242a3..f73ad28ba1 100644
--- a/phpBB/includes/template/filter.php
+++ b/phpBB/includes/template/filter.php
@@ -88,6 +88,37 @@ class phpbb_template_filter extends php_user_filter
 	private $phpbb_root_path;
 
 	/**
+	* Name of the style that the template being compiled and/or rendered
+	* belongs to, and its parents, in inheritance tree order.
+	*
+	* Used to invoke style-specific template events.
+	*
+	* @var array
+	*/
+	private $style_names;
+
+	/**
+	* Extension manager.
+	*
+	* @var phpbb_extension_manager
+	*/
+	private $extension_manager;
+
+	/**
+	* Current user
+	*
+	* @var phpbb_user
+	*/
+	private $user;
+
+	/**
+	* Template compiler.
+	*
+	* @var phpbb_template_compile
+	*/
+	private $template_compile;
+
+	/**
 	* Stream filter
 	*
 	* Is invoked for evey chunk of the stream, allowing us
@@ -138,8 +169,10 @@ class phpbb_template_filter extends php_user_filter
 	/**
 	* Initializer, called on creation.
 	*
-	* Get the allow_php option, root directory and locator from params,
+	* Get the allow_php option, style_names, root directory and locator from params,
 	* which are passed to stream_filter_append.
+	*
+	* @return boolean Returns true
 	*/
 	public function onCreate()
 	{
@@ -148,6 +181,13 @@ class phpbb_template_filter extends php_user_filter
 		$this->allow_php = $this->params['allow_php'];
 		$this->locator = $this->params['locator'];
 		$this->phpbb_root_path = $this->params['phpbb_root_path'];
+		$this->style_names = $this->params['style_names'];
+		$this->extension_manager = $this->params['extension_manager'];
+		if (isset($this->params['user']))
+		{
+			$this->user = $this->params['user'];
+		}
+		$this->template_compile = $this->params['template_compile'];
 		return true;
 	}
 
@@ -229,7 +269,9 @@ class phpbb_template_filter extends php_user_filter
 	}
 
 	/**
-	* Callback for replacing matched tokens with PHP code
+	* Callback for replacing matched tokens with compiled template code.
+	*
+	* Compiled template code is an HTML stream with embedded PHP.
 	*
 	* @param array $matches Regular expression matches
 	* @return string compiled template code
@@ -317,6 +359,10 @@ class phpbb_template_filter extends php_user_filter
 				return '<!-- ENDPHP -->';
 			break;
 
+			case 'EVENT':
+				return '<?php ' . $this->compile_tag_event($matches[2]) . '?>';
+			break;
+
 			default:
 				return $matches[0];
 			break;
@@ -836,6 +882,97 @@ class phpbb_template_filter extends php_user_filter
 	}
 
 	/**
+	* Compile EVENT tag.
+	*
+	* $tag_args should be a single string identifying the event.
+	* The event name can contain letters, numbers and underscores only.
+	* If an invalid event name is specified, an E_USER_ERROR will be
+	* triggered.
+	*
+	* Event tags are only functional when the template engine has
+	* an instance of the extension manager. Extension manager would
+	* be called upon to find all extensions listening for the specified
+	* event, and to obtain additional template fragments. All such
+	* template fragments will be compiled and included in the generated
+	* compiled template code for the current template being compiled.
+	*
+	* The above means that whenever an extension is enabled or disabled,
+	* template cache should be cleared in order to update the compiled
+	* template code for the active set of template event listeners.
+	*
+	* This also means that extensions cannot return different template
+	* fragments at different times. Once templates are compiled, changing
+	* such template fragments would have no effect.
+	*
+	* @param string $tag_args EVENT tag arguments, as a string - for EVENT this is the event name
+	* @return string compiled template code
+	*/
+	private function compile_tag_event($tag_args)
+	{
+		if (!preg_match('/^\w+$/', $tag_args))
+		{
+			// The event location is improperly formatted,
+			if ($this->user)
+			{
+				trigger_error($this->user->lang('ERR_TEMPLATE_EVENT_LOCATION', $tag_args), E_USER_ERROR);
+			}
+			else
+			{
+				trigger_error(sprintf('The specified template event location <em>[%s]</em> is improperly formatted.', $tag_args), E_USER_ERROR);
+			}
+		}
+		$location = $tag_args;
+
+		if ($this->extension_manager)
+		{
+			$finder = $this->extension_manager->get_finder();
+
+			$files = $finder
+				->extension_prefix($location)
+				->extension_suffix('.html')
+				->extension_directory("/styles/all/template")
+				->get_files();
+
+			foreach ($this->style_names as $style_name)
+			{
+				$more_files = $finder
+					->extension_prefix($location)
+					->extension_suffix('.html')
+					->extension_directory("/styles/" . $style_name . "/template")
+					->get_files();
+				if (!empty($more_files))
+				{
+					$files = array_merge($files, $more_files);
+					break;
+				}
+			}
+
+			$all_compiled = '';
+			foreach ($files as $file)
+			{
+				$compiled = $this->template_compile->compile_file($file);
+
+				if ($compiled === false)
+				{
+					if ($this->user)
+					{
+						trigger_error($this->user->lang('ERR_TEMPLATE_COMPILATION', phpbb_filter_root_path($file)), E_USER_ERROR);
+					}
+					else
+					{
+						trigger_error(sprintf('The file could not be compiled: %s', phpbb_filter_root_path($file)), E_USER_ERROR);
+					}
+				}
+
+				$all_compiled .= $compiled;
+			}
+			// Need spaces inside php tags as php cannot grok
+			// < ?php? > sans the spaces
+			return ' ?' . '>' . $all_compiled . '<?php ';
+		}
+	}
+
+	/**
 	* parse expression
 	* This is from Smarty
 	*/
diff --git a/phpBB/includes/template/locator.php b/phpBB/includes/template/locator.php
index 01c79eec4e..f6fd20bcc2 100644
--- a/phpBB/includes/template/locator.php
+++ b/phpBB/includes/template/locator.php
@@ -39,7 +39,7 @@ interface phpbb_template_locator
 	* Sets the template filenames for handles. $filename_array
 	* should be a hash of handle => filename pairs.
 	*
-	* @param array $filname_array Should be a hash of handle => filename pairs.
+	* @param array $filename_array Should be a hash of handle => filename pairs.
 	*/
 	public function set_filenames(array $filename_array);
 
@@ -66,7 +66,7 @@ interface phpbb_template_locator
 	* returns actually exists, it is faster than get_source_file_for_handle.
 	*
 	* Use get_source_file_for_handle to obtain the actual path that is
-	* guaranteed to exist (which might come from the parent style 
+	* guaranteed to exist (which might come from the parent style
 	* directory if primary style has parent styles).
 	*
 	* This function will trigger an error if the handle was never
@@ -99,12 +99,54 @@ interface phpbb_template_locator
 	public function get_source_file_for_handle($handle, $find_all = false);
 
 	/**
-	* Locates source file path, accounting for styles tree and verifying that
-	* the path exists.
+	* Obtains a complete filesystem path for a file in a style.
 	*
-	* Unlike previous functions, this function works without template handle
-	* and it can search for more than one file. If more than one file name is
-	* specified, it will return location of file that it finds first.
+	* This function traverses the style tree (selected style and
+	* its parents in order, if inheritance is being used) and finds
+	* the first file on the filesystem matching specified relative path,
+	* or the first of the specified paths if more than one path is given.
+	*
+	* This function can be used to determine filesystem path of any
+	* file under any style, with the consequence being that complete
+	* relative to the style directory path must be provided as an argument.
+	*
+	* In particular, this function can be used to locate templates
+	* and javascript files.
+	*
+	* For locating templates get_first_template_location should be used
+	* as it prepends the configured template path to the template basename.
+	*
+	* Note: "selected style" is whatever style the style resource locator
+	* is configured for.
+	*
+	* The return value then will be a path, relative to the current
+	* directory or absolute, to the first existing file in the selected
+	* style or its closest parent.
+	*
+	* If the selected style does not have the file being searched,
+	* (and if inheritance is involved, none of the parents have it either),
+	* false will be returned.
+	*
+	* Multiple files can be specified, in which case the first file in
+	* the list that can be found on the filesystem is returned.
+	*
+	* If multiple files are specified and inheritance is involved,
+	* first each of the specified files is checked in the selected style,
+	* then each of the specified files is checked in the immediate parent,
+	* etc.
+	*
+	* Specifying true for $return_default will cause the function to
+	* return the first path which was checked for existence in the event
+	* that the template file was not found, instead of false.
+	* This is always a path in the selected style itself, not any of its
+	* parents.
+	*
+	* If $return_full_path is false, then instead of returning a usable
+	* path (when the file is found) the file's path relative to the style
+	* directory will be returned. This is the same path as was given to
+	* the function as a parameter. This can be used to check which of the
+	* files specified in $files exists. Naturally this requires passing
+	* more than one file in $files.
 	*
 	* @param array $files List of files to locate.
 	* @param bool $return_default Determines what to return if file does not
diff --git a/phpBB/includes/template/template.php b/phpBB/includes/template/template.php
index 8a7dc6b2f3..bbec768613 100644
--- a/phpBB/includes/template/template.php
+++ b/phpBB/includes/template/template.php
@@ -75,10 +75,21 @@ class phpbb_template
 	private $locator;
 
 	/**
-	* Location of templates directory within style directories
-	* @var string
+	* Extension manager.
+	*
+	* @var phpbb_extension_manager
+	*/
+	private $extension_manager;
+
+	/**
+	* Name of the style that the template being compiled and/or rendered
+	* belongs to, and its parents, in inheritance tree order.
+	*
+	* Used to invoke style-specific template events.
+	*
+	* @var array
 	*/
-	public $template_path = 'template/';
+	private $style_names;
 
 	/**
 	* Constructor.
@@ -87,22 +98,23 @@ class phpbb_template
 	* @param user $user current user
 	* @param phpbb_template_locator $locator template locator
 	* @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_root_path, $php_ext, $config, $user, phpbb_template_locator $locator, phpbb_template_context $context)
+	public function __construct($phpbb_root_path, $php_ext, $config, $user, phpbb_template_locator $locator, phpbb_template_context $context, phpbb_extension_manager $extension_manager = null)
 	{
 		$this->phpbb_root_path = $phpbb_root_path;
 		$this->php_ext = $php_ext;
 		$this->config = $config;
 		$this->user = $user;
 		$this->locator = $locator;
-		$this->template_path = $this->locator->template_path;
 		$this->context = $context;
+		$this->extension_manager = $extension_manager;
 	}
 
 	/**
 	* Sets the template filenames for handles.
 	*
-	* @param array $filname_array Should be a hash of handle => filename pairs.
+	* @param array $filename_array Should be a hash of handle => filename pairs.
 	*/
 	public function set_filenames(array $filename_array)
 	{
@@ -112,6 +124,18 @@ class phpbb_template
 	}
 
 	/**
+	* Sets the style names corresponding to style hierarchy being compiled
+	* and/or rendered.
+	*
+	* @param array $style_names List of style names in inheritance tree order
+	* @return null
+	*/
+	public function set_style_names(array $style_names)
+	{
+		$this->style_names = $style_names;
+	}
+
+	/**
 	* Clears all variables and blocks assigned to this template.
 	*/
 	public function destroy()
@@ -289,7 +313,7 @@ class phpbb_template
 			return new phpbb_template_renderer_include($output_file, $this);
 		}
 
-		$compile = new phpbb_template_compile($this->config['tpl_allow_php'], $this->locator, $this->phpbb_root_path);
+		$compile = new phpbb_template_compile($this->config['tpl_allow_php'], $this->style_names, $this->locator, $this->phpbb_root_path, $this->extension_manager, $this->user);
 
 		if ($compile->compile_file_to_file($source_file, $output_file) !== false)
 		{
@@ -459,74 +483,6 @@ class phpbb_template
 	}
 
 	/**
-	* Obtains filesystem path for a template file.
-	*
-	* The simplest use is specifying a single template file as a string
-	* in the first argument. This template file should be a basename
-	* of a template file in the selected style, or its parent styles
-	* if template inheritance is being utilized.
-	*
-	* Note: "selected style" is whatever style the style resource locator
-	* is configured for.
-	*
-	* The return value then will be a path, relative to the current
-	* directory or absolute, to the template file in the selected style
-	* or its closest parent.
-	*
-	* If the selected style does not have the template file being searched,
-	* (and if inheritance is involved, none of the parents have it either),
-	* false will be returned.
-	*
-	* Specifying true for $return_default will cause the function to
-	* return the first path which was checked for existence in the event
-	* that the template file was not found, instead of false.
-	* This is the path in the selected style itself, not any of its
-	* parents.
-	*
-	* $files can be given an array of templates instead of a single
-	* template. When given an array, the function will try to resolve
-	* each template in the array to a path, and will return the first
-	* path that exists, or false if none exist.
-	*
-	* If $return_full_path is false, then instead of returning a usable
-	* path (when the template is found) only the template's basename
-	* will be returned. This can be used to check which of the templates
-	* specified in $files exists, provided different file names are
-	* used for different templates.
-	*
-	* @param string or array $files List of templates to locate. If there is only
-	*				one template, $files can be a string to make code easier to read.
-	* @param bool $return_default Determines what to return if template does not
-	*				exist. If true, function will return location where template is
-	*				supposed to be. If false, function will return false.
-	* @param bool $return_full_path If true, function will return full path
-	*				to template. If false, function will return template file name.
-	*				This parameter can be used to check which one of set of template
-	*				files is available.
-	* @return string or boolean Source template path if template exists or $return_default is
-	*				true. False if template does not exist and $return_default is false
-	*/
-	public function locate($files, $return_default = false, $return_full_path = true)
-	{
-		// add template path prefix
-		$templates = array();
-		if (is_string($files))
-		{
-			$templates[] = $this->template_path . $files;
-		}
-		else
-		{
-			foreach ($files as $file)
-			{
-				$templates[] = $this->template_path . $file;
-			}
-		}
-
-		// use resource locator to find files
-		return $this->locator->get_first_file_location($templates, $return_default, $return_full_path);
-	}
-
-	/**
 	* Include JS file
 	*
 	* @param string $file file name