File Source for Template.class.php

<?php
/**
* Template.class.php
*
* This file contains an abstract (PHP 4, so "abstract" is relative)
* class meant to define the basic template interface for the
* SquirrelMail core application. Subclasses should extend this
* class with any custom functionality needed to interface a target
* templating engine with SquirrelMail.
*
* @copyright 2003-2012 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: Template.class.php 14346 2012-12-09 12:06:30Z kink $
* @package squirrelmail
* @subpackage Template
* @since 1.5.2
*
*/
/** load template functions */
require(SM_PATH . 'functions/template/general_util.php');
/**
* The SquirrelMail Template class.
*
* Basic template class for capturing values and pluging them into a template.
* This class uses a similar API to Smarty.
*
* Methods that must be implemented by subclasses are as follows (see method
* stubs below for further information about expected behavior):
*
* assign()
* assign_by_ref()
* clear_all_assign()
* get_template_vars()
* append()
* append_by_ref()
* apply_template()
*
* @author Paul Lesniewski <paul at squirrelmail.org>
* @package squirrelmail
*
*/
class Template
{
/**
* The template ID
*
* @var string
*
*/
var $template_set_id = '';
/**
* The template set base directory (relative path from
* the main SquirrelMail directory (SM_PATH))
*
* @var string
*
*/
var $template_dir = '';
/**
* The template engine (please use constants defined in constants.php)
*
* @var string
*
*/
var $template_engine = '';
/**
* The content type for this template set
*/
var $content_type = '';
/**
* The fall-back template ID
*
* @var string
*
*/
var $fallback_template_set_id = '';
/**
* The fall-back template directory (relative
* path from the main SquirrelMail directory (SM_PATH))
*
* @var string
*
*/
var $fallback_template_dir = '';
/**
* The fall-back template engine (please use
* constants defined in constants.php)
*
* @var string
*
*/
var $fallback_template_engine = '';
/**
* Template file cache. Structured as an array, whose keys
* are all the template file names (with path information relative
* to the template set's base directory, e.g., "css/style.css")
* found in all parent template sets including the ultimate fall-back
* template set. Array values are sub-arrays with the
* following key-value pairs:
*
* PATH -- file path, relative to SM_PATH
* SET_ID -- the ID of the template set that this file belongs to
* ENGINE -- the engine needed to render this template file
*
*/
var $template_file_cache = array();
/**
* Extra template engine class objects for rendering templates
* that require a different engine than the one for the current
* template set. Keys should be the name of the template engine,
* values are the corresponding class objects.
*
* @var array
*
*/
var $other_template_engine_objects = array();
/**
* Constructor
*
* Please do not call directly. Use Template::construct_template().
*
* @param string $template_set_id the template ID
*
*/
function Template($template_set_id) {
//FIXME: find a way to test that this is ONLY ever called
// from the construct_template() method (I doubt it
// is worth the trouble to parse the current stack trace)
// if (???)
// trigger_error('Please do not use default Template() constructor. Instead, use Template::construct_template().', E_USER_ERROR);
$this->set_up_template($template_set_id);
}
/**
* Construct Template
*
* This method should always be called instead of trying
* to get a Template object from the normal/default constructor,
* and is necessary in order to control the return value.
*
* @param string $template_set_id the template ID
*
* @return object The correct Template object for the given template set
*
* @static
*
*/
function construct_template($template_set_id) {
$template = new Template($template_set_id);
$template->override_plugins();
return $template->get_template_engine_subclass();
}
/**
* Set up internal attributes
*
* This method does most of the work for setting up
* newly constructed objects.
*
* @param string $template_set_id the template ID
*
*/
function set_up_template($template_set_id) {
// FIXME: do we want to place any restrictions on the ID like
// making sure no slashes included?
// get template ID
//
$this->template_set_id = $template_set_id;
$this->fallback_template_set_id = Template::get_fallback_template_set();
// set up template directories
//
$this->template_dir
= Template::calculate_template_file_directory($this->template_set_id);
$this->fallback_template_dir
= Template::calculate_template_file_directory($this->fallback_template_set_id);
// determine content type, defaulting to text/html
//
$this->content_type = Template::get_template_config($this->template_set_id,
'content_type',
'text/html');
// determine template engine
// FIXME: assuming PHP template engine may not necessarily be a good thing
//
$this->template_engine = Template::get_template_config($this->template_set_id,
'template_engine',
SQ_PHP_TEMPLATE);
// get template file cache
//
$this->template_file_cache = Template::cache_template_file_hierarchy($template_set_id);
}
/**
* Determine what the ultimate fallback template set is.
*
* NOTE that if the fallback setting cannot be found in the
* main SquirrelMail configuration settings that the value
* of $default is returned.
*
* @param string $default The template set ID to use if
* the fallback setting cannot be
* found in SM config (optional;
* defaults to "default").
*
* @return string The ID of the fallback template set.
*
* @static
*
*/
function get_fallback_template_set($default='default') {
// FIXME: do we want to place any restrictions on the ID such as
// making sure no slashes included?
// values are in main SM config file
//
global $templateset_fallback, $aTemplateSet;
$aTemplateSet = (!isset($aTemplateSet) || !is_array($aTemplateSet)
? array() : $aTemplateSet);
$templateset_fallback = (!isset($templateset_fallback)
? $default : $templateset_fallback);
// iterate through all template sets, is this a valid skin ID?
//
$found_it = FALSE;
foreach ($aTemplateSet as $aTemplate) {
if ($aTemplate['ID'] === $templateset_fallback) {
$found_it = TRUE;
break;
}
}
if ($found_it)
return $templateset_fallback;
// FIXME: note that it is possible for $default to
// point to an invalid (nonexistent) template set
// and that error will not be caught here
//
return $default;
}
/**
* Determine what the default template set is.
*
* NOTE that if the default setting cannot be found in the
* main SquirrelMail configuration settings that the value
* of $default is returned.
*
* @param string $default The template set ID to use if
* the default setting cannot be
* found in SM config (optional;
* defaults to "default").
*
* @return string The ID of the default template set.
*
* @static
*
*/
function get_default_template_set($default='default') {
// FIXME: do we want to place any restrictions on the ID such as
// making sure no slashes included?
// values are in main SM config file
//
global $templateset_default, $aTemplateSet;
$aTemplateSet = (!isset($aTemplateSet) || !is_array($aTemplateSet)
? array() : $aTemplateSet);
$templateset_default = (!isset($templateset_default)
? $default : $templateset_default);
// iterate through all template sets, is this a valid skin ID?
//
$found_it = FALSE;
foreach ($aTemplateSet as $aTemplate) {
if ($aTemplate['ID'] === $templateset_default) {
$found_it = TRUE;
break;
}
}
if ($found_it)
return $templateset_default;
// FIXME: note that it is possible for $default to
// point to an invalid (nonexistent) template set
// and that error will not be caught here
//
return $default;
}
/**
* Determine what the RPC template set is.
*
* NOTE that if the default setting cannot be found in the
* main SquirrelMail configuration settings that the value
* of $default is returned.
*
* @param string $default The template set ID to use if
* the default setting cannot be
* found in SM config (optional;
* defaults to "default_rpc").
*
* @return string The ID of the RPC template set.
*
* @static
*
*/
function get_rpc_template_set($default='default_rpc') {
// FIXME: do we want to place any restrictions on the ID such as
// making sure no slashes included?
// values are in main SM config file
//
global $rpc_templateset;
$rpc_templateset = (!isset($rpc_templateset)
? $default : $rpc_templateset);
// FIXME: note that it is possible for this to
// point to an invalid (nonexistent) template set
// and that error will not be caught here
//
return $rpc_templateset;
}
/**
* Allow template set to override plugin configuration by either
* adding or removing plugins.
*
* NOTE: due to when this code executes, plugins activated here
* do not have access to the config_override and loading_prefs
* hooks; instead, such plugins can use the
* "template_plugins_override_after" hook defined below.
*
*/
function override_plugins() {
global $disable_plugins, $plugins, $squirrelmail_plugin_hooks, $null;
if ($disable_plugins) return;
$add_plugins = Template::get_template_config($this->template_set_id,
'add_plugins', array());
$remove_plugins = Template::get_template_config($this->template_set_id,
'remove_plugins', array());
//FIXME (?) we assume $add_plugins and $remove_plugins are arrays -- we could
// error check here, or just assume that template authors or admins
// won't screw up their config files
// disable all plugins? (can still add some by using $add_plugins)
//
if (in_array('*', $remove_plugins)) {
$plugins = array();
$squirrelmail_plugin_hooks = array();
$remove_plugins = array();
}
foreach ($add_plugins as $plugin_name) {
// add plugin to global plugin array
//
$plugins[] = $plugin_name;
// enable plugin -- emulate code from use_plugin() function
// in SquirrelMail core, but also need to call the
// "squirrelmail_plugin_init_<plugin_name>" function, which
// in static configuration is not called (this inconsistency
// could be a source of anomalous-seeming bugs in poorly
// coded plugins)
//
if (file_exists(SM_PATH . "plugins/$plugin_name/setup.php")) {
include_once(SM_PATH . "plugins/$plugin_name/setup.php");
$function = "squirrelmail_plugin_init_$plugin_name";
if (function_exists($function))
$function();
}
}
foreach ($remove_plugins as $plugin_name) {
// remove plugin from both global plugin & plugin hook arrays
//
$plugin_key = array_search($plugin_name, $plugins);
if (!is_null($plugin_key) && $plugin_key !== FALSE) {
unset($plugins[$plugin_key]);
if (is_array($squirrelmail_plugin_hooks))
foreach (array_keys($squirrelmail_plugin_hooks) as $hookName) {
unset($squirrelmail_plugin_hooks[$hookName][$plugin_name]);
}
}
}
do_hook('template_plugins_override_after', $null);
}
/**
* Instantiate and return correct subclass for this template
* set's templating engine.
*
* @param string $template_set_id The template set whose engine
* is to be used as an override
* (if not given, this template
* set's engine is used) (optional).
*
* @return object The Template subclass object for the template engine.
*
*/
function get_template_engine_subclass($template_set_id='') {
if (empty($template_set_id)) $template_set_id = $this->template_set_id;
// FIXME: assuming PHP template engine may not necessarily be a good thing
$engine = Template::get_template_config($template_set_id,
'template_engine', SQ_PHP_TEMPLATE);
$engine_class_file = SM_PATH . 'class/template/'
. $engine . 'Template.class.php';
if (!file_exists($engine_class_file)) {
trigger_error('Unknown template engine (' . $engine
. ') was specified in template configuration file',
E_USER_ERROR);
}
$engine_class = $engine . 'Template';
require_once($engine_class_file);
return new $engine_class($template_set_id);
}
/**
* Determine the relative template directory path for
* the given template ID.
*
* @param string $template_set_id The template ID from which to build
* the directory path
*
* @return string The relative template path (based off of SM_PATH)
*
* @static
*
*/
function calculate_template_file_directory($template_set_id) {
return 'templates/' . $template_set_id . '/';
}
/**
* Determine the relative images directory path for
* the given template ID.
*
* @param string $template_set_id The template ID from which to build
* the directory path
*
* @return string The relative images path (based off of SM_PATH)
*
* @static
*
*/
function calculate_template_images_directory($template_set_id) {
return 'templates/' . $template_set_id . '/images/';
}
/**
* Return the relative template directory path for this template set.
*
* @return string The relative path to the template directory based
* from the main SquirrelMail directory (SM_PATH).
*
*/
function get_template_file_directory() {
return $this->template_dir;
}
/**
* Return the template ID for the fallback template set.
*
* @return string The ID of the fallback template set.
*
*/
function get_fallback_template_set_id() {
return $this->fallback_template_set_id;
}
/**
* Return the relative template directory path for the
* fallback template set.
*
* @return string The relative path to the fallback template
* directory based from the main SquirrelMail
* directory (SM_PATH).
*
*/
function get_fallback_template_file_directory() {
return $this->fallback_template_dir;
}
/**
* Return the content-type for this template set.
*
* @return string The content-type.
*
*/
function get_content_type() {
return $this->content_type;
}
/**
* Get template set config setting
*
* Given a template set ID and setting name, returns the
* setting's value. Note that settings are cached in
* session, so "live" changes to template configuration
* won't be reflected until the user logs out and back
* in again.
*
* @param string $template_set_id The template set for which
* to look up the setting.
* @param string $setting The name of the setting to
* retrieve.
* @param mixed $default When the requested setting
* is not found, the contents
* of this value are returned
* instead (optional; default
* is NULL).
* NOTE that unlike sqGetGlobalVar(),
* this function will also return
* the default value if the
* requested setting is found
* but is empty.
* @param boolean $live_config When TRUE, the target template
* set's configuration file is
* reloaded every time this
* method is called. Default
* behavior is to only load the
* configuration file if it had
* never been loaded before, but
* not again after that (optional;
* default FALSE). Use with care!
* Should mostly be used for
* debugging.
*
* @return mixed The desired setting's value or if not found,
* the contents of $default are returned.
*
* @static
*
*/
function get_template_config($template_set_id, $setting,
$default=NULL, $live_config=FALSE) {
sqGetGlobalVar('template_configuration_settings',
$template_configuration_settings,
SQ_SESSION,
array());
if ($live_config) unset($template_configuration_settings[$template_set_id]);
// NOTE: could use isset() instead of empty() below, but
// this function is designed to replace empty values
// as well as non-existing values with $default
//
if (!empty($template_configuration_settings[$template_set_id][$setting]))
return $template_configuration_settings[$template_set_id][$setting];
// if template set configuration has been loaded, but this
// setting is not known, return $default
//
if (!empty($template_configuration_settings[$template_set_id]))
return $default;
// otherwise (template set configuration has not been loaded before),
// load it into session and return the desired setting after that
//
$template_config_file = SM_PATH
. Template::calculate_template_file_directory($template_set_id)
. 'config.php';
if (!file_exists($template_config_file)) {
trigger_error('No template configuration file was found where expected: ("'
. $template_config_file . '")', E_USER_ERROR);
} else {
// we require() the file to let PHP do the variable value
// parsing for us, and read the file in manually so we can
// know what variable names are used in the config file
// (settings can be different depending on specific requirements
// of different template engines)... the other way this may
// be accomplished is to somehow diff the symbol table
// before/after the require(), but anyway, this code should
// only run once for this template set...
//
require($template_config_file);
$file_contents = implode("\n", file($template_config_file));
// note that this assumes no template settings have
// a string in them that looks like a variable name like $x
// also note that this will attempt to grab things like
// $Id found in CVS headers, so we try to adjust for that
// by checking that the variable is actually set
//
preg_match_all('/\$(\w+)/', $file_contents, $variables, PREG_PATTERN_ORDER);
foreach ($variables[1] as $variable) {
if (isset($$variable))
$template_configuration_settings[$template_set_id][$variable]
= $$variable;
}
sqsession_register($template_configuration_settings,
'template_configuration_settings');
// NOTE: could use isset() instead of empty() below, but
// this function is designed to replace empty values
// as well as non-existing values with $default
//
if (!empty($template_configuration_settings[$template_set_id][$setting]))
return $template_configuration_settings[$template_set_id][$setting];
else
return $default;
}
}
/**
* Obtain template file hierarchy from cache.
*
* If the file hierarchy does not exist in session, it is
* constructed and stored in session before being returned
* to the caller.
*
* @param string $template_set_id The template set for which
* the cache should be built.
* This function will save more
* than one set's files, so it
* may be called multiple times
* with different values for this
* argument. When regenerating,
* all set caches are dumped.
* @param boolean $regenerate_cache When TRUE, the file hierarchy
* is reloaded and stored fresh
* (optional; default FALSE).
* @param array $additional_files Must be in same form as the
* files in the file hierarchy
* cache. These are then added
* to the cache (optional; default
* empty - no additional files).
*
* @return array Template file hierarchy array, whose keys
* are all the template file names for the given
* template set ID (with path information relative
* to the template set's base directory, e.g.,
* "css/style.css") found in all parent template
* sets including the ultimate fall-back template
* set. Array values are sub-arrays with the
* following key-value pairs:
*
* PATH -- file path, relative to SM_PATH
* SET_ID -- the ID of the template set that this file belongs to
* ENGINE -- the engine needed to render this template file
*
* @static
*
*/
function cache_template_file_hierarchy($template_set_id,
$regenerate_cache=FALSE,
$additional_files=array()) {
sqGetGlobalVar('template_file_hierarchy', $template_file_hierarchy,
SQ_SESSION, array());
if ($regenerate_cache) unset($template_file_hierarchy);
if (!empty($template_file_hierarchy[$template_set_id])) {
// have to add additional files if given before returning
//
if (!empty($additional_files)) {
$template_file_hierarchy[$template_set_id]
= array_merge($template_file_hierarchy[$template_set_id],
$additional_files);
sqsession_register($template_file_hierarchy,
'template_file_hierarchy');
}
return $template_file_hierarchy[$template_set_id];
}
// nothing in cache apparently, so go build it now
//
$template_file_hierarchy[$template_set_id] = Template::catalog_template_files($template_set_id);
// additional files, if any
//
if (!empty($additional_files)) {
$template_file_hierarchy[$template_set_id]
= array_merge($template_file_hierarchy[$template_set_id],
$additional_files);
}
sqsession_register($template_file_hierarchy,
'template_file_hierarchy');
return $template_file_hierarchy[$template_set_id];
}
/**
* Traverse template hierarchy and catalogue all template
* files (for storing in cache).
*
* Paths to all files in all parent, grand-parent, great grand
* parent, etc. template sets (including the fallback template)
* are catalogued; for identically named files, the file earlier
* in the hierarchy (closest to this template set) is used.
*
* Refuses to traverse directories called ".svn"
*
* @param string $template_set_id The template set in which to
* search for files
* @param array $file_list The file list so far to be added
* to (allows recursive behavior)
* (optional; default empty array).
* @param string $directory The directory in which to search for
* files (must be given as full path).
* If empty, starts at top-level template
* set directory (optional; default empty).
* NOTE! Use with care, as behavior is
* unpredictable if directory given is not
* part of correct template set.
*
* @return mixed The top-level caller will have an array of template
* files returned to it; recursive calls to this function
* do not receive any return value at all. The format
* of the template file array is as described for the
* Template class attribute $template_file_cache
*
* @static
*
*/
function catalog_template_files($template_set_id, $file_list=array(), $directory='') {
$template_base_dir = SM_PATH
. Template::calculate_template_file_directory($template_set_id);
if (empty($directory)) {
$directory = $template_base_dir;
}
// bail if we have been asked to traverse a Subversion directory
//
if (strpos($directory, '/.svn') === strlen($directory) - 5) return $file_list;
$files_and_dirs = list_files($directory, '', FALSE, TRUE, FALSE, TRUE);
// recurse for all the subdirectories in the template set
//
foreach ($files_and_dirs['DIRECTORIES'] as $dir) {
$file_list = Template::catalog_template_files($template_set_id, $file_list, $dir);
}
// place all found files in the cache
// FIXME: assuming PHP template engine may not necessarily be a good thing
//
$engine = Template::get_template_config($template_set_id,
'template_engine', SQ_PHP_TEMPLATE);
foreach ($files_and_dirs['FILES'] as $file) {
// remove the part of the file path corresponding to the
// template set's base directory
//
$relative_file = substr($file, strlen($template_base_dir));
/**
* only put file in cache if not already found in earlier template
* PATH should be relative to SquirrelMail top directory
*/
if (!isset($file_list[$relative_file])) {
$file_list[$relative_file] = array(
'PATH' => substr($file,strlen(SM_PATH)),
'SET_ID' => $template_set_id,
'ENGINE' => $engine,
);
}
}
// now if we are currently at the top-level of the template
// set base directory, we need to move on to the parent
// template set, if any
//
if ($directory == $template_base_dir) {
// use fallback when we run out of parents
//
$fallback_id = Template::get_fallback_template_set();
$parent_id = Template::get_template_config($template_set_id,
'parent_template_set',
$fallback_id);
// were we already all the way to the last level? just exit
//
// note that this code allows the fallback set to have
// a parent, too, but can result in endless loops
// if ($parent_id == $template_set_id) {
//
if ($fallback_id == $template_set_id) {
return $file_list;
}
$file_list = Template::catalog_template_files($parent_id, $file_list);
}
return $file_list;
}
/**
* Look for a template file in a plugin; add to template
* file cache if found.
*
* The file is searched for in the following order:
*
* - A directory for the current template set within the plugin:
* SM_PATH/plugins/<plugin name>/templates/<template name>/
* - In a directory for one of the current template set's ancestor
* (inherited) template sets within the plugin:
* SM_PATH/plugins/<plugin name>/templates/<parent template name>/
* - In a directory for the fallback template set within the plugin:
* SM_PATH/plugins/<plugin name>/templates/<fallback template name>/
*
* @param string $plugin The name of the plugin
* @param string $file The name of the template file
* @param string $template_set_id The ID of the template for which
* to start looking for the file
* (optional; default is current
* template set ID).
*
* @return boolean TRUE if the template file was found, FALSE otherwise.
*
*/
function find_and_cache_plugin_template_file($plugin, $file, $template_set_id='') {
if (empty($template_set_id))
$template_set_id = $this->template_set_id;
$file_path = SM_PATH . 'plugins/' . $plugin . '/'
. $this->calculate_template_file_directory($template_set_id)
. $file;
if (file_exists($file_path)) {
// FIXME: assuming PHP template engine may not necessarily be a good thing
$engine = $this->get_template_config($template_set_id,
'template_engine', SQ_PHP_TEMPLATE);
$file_list = array('plugins/' . $plugin . '/' . $file => array(
'PATH' => substr($file_path, strlen(SM_PATH)),
'SET_ID' => $template_set_id,
'ENGINE' => $engine,
)
);
$this->template_file_cache
= $this->cache_template_file_hierarchy($this->template_set_id,
FALSE,
$file_list);
return TRUE;
}
// not found yet, try parent template set
// (use fallback when we run out of parents)
//
$fallback_id = $this->get_fallback_template_set();
$parent_id = $this->get_template_config($template_set_id,
'parent_template_set',
$fallback_id);
// were we already all the way to the last level? just exit
//
// note that this code allows the fallback set to have
// a parent, too, but can result in endless loops
// if ($parent_id == $template_set_id) {
//
if ($fallback_id == $template_set_id) {
return FALSE;
}
return $this->find_and_cache_plugin_template_file($plugin, $file, $parent_id);
}
/**
* Find the right template file.
*
* The template file is taken from the template file cache, thus
* the file is taken from the current template, one of its
* ancestors or the fallback template.
*
* Note that it is perfectly acceptable to load template files from
* template subdirectories. For example, JavaScript templates found
* in the js/ subdirectory would be loaded by passing
* "js/<javascript file name>" as the $filename.
*
* Note that the caller can also ask for ALL files in a directory
* (and those in the same directory for all ancestor template sets)
* by giving a $filename that is a directory name (ending with a
* slash).
*
* If not found and the file is a plugin template file (indicated
* by the presence of "plugins/" on the beginning of $filename),
* the target plugin is searched for a substitue template file
* before just returning nothing.
*
* Plugin authors must note that the $filename MUST be prefaced
* with "plugins/<plugin name>/" in order to correctly resolve the
* template file.
*
* @param string $filename The name of the template file,
* possibly prefaced with
* "plugins/<plugin name>/"
* indicating that it is a plugin
* template, or ending with a
* slash, indicating that all files
* for that directory name should
* be returned.
* @param boolean $directories_ok When TRUE, directory names
* are acceptable search values,
* and when returning a list of
* directory contents, sub-directory
* names will also be included
* (optional; default FALSE).
* NOTE that empty directories
* are NOT included in the cache!
* @param boolean $directories_only When TRUE, only directory names
* are included in the returned
* results. (optional; default
* FALSE). Setting this argument
* to TRUE forces $directories_ok
* to TRUE as well.
* NOTE that empty directories
* are NOT included in the cache!
*
* @return mixed The full path to the template file or a list
* of all files in the given directory if $filename
* ends with a slash; if not found, an empty string
* is returned. The caller is responsible for
* throwing errors or other actions if template
* file is not found.
*
*/
function get_template_file_path($filename,
$directories_ok=FALSE,
$directories_only=FALSE) {
if ($directories_only) $directories_ok = TRUE;
// only looking for directory listing first...
//
// return list of all files in a directory (and that
// of any ancestors)
//
if ($filename{strlen($filename) - 1} == '/') {
$return_array = array();
foreach ($this->template_file_cache as $file => $file_info) {
// only want files in the requested directory
// (AND not in a subdirectory!)
//
if (!$directories_only && strpos($file, $filename) === 0
&& strpos($file, '/', strlen($filename)) === FALSE)
$return_array[] = SM_PATH . $file_info['PATH'];
// directories too? detect by finding any
// array key that matches a file in a sub-directory
// of the directory being processed
//
if ($directories_ok && strpos($file, $filename) === 0
&& ($pos = strpos($file, '/', strlen($filename))) !== FALSE
&& strpos($file, '/', $pos + 1) === FALSE) {
$directory_name = SM_PATH
. substr($file_info['PATH'],
0,
strrpos($file_info['PATH'], '/'));
if (!in_array($directory_name, $return_array))
$return_array[] = $directory_name;
}
}
return $return_array;
}
// just looking for singular file or directory below...
//
// figure out what to do with files not found
//
if ($directories_only || empty($this->template_file_cache[$filename]['PATH'])) {
// if looking for directories...
// have to iterate through cache and detect
// directory by matching any file inside of it
//
if ($directories_ok) {
foreach ($this->template_file_cache as $file => $file_info) {
if (strpos($file, $filename) === 0
&& ($pos = strpos($file, '/', strlen($filename))) !== FALSE
&& strpos($file, '/', $pos + 1) === FALSE) {
return SM_PATH . substr($file_info['PATH'],
0,
strrpos($file_info['PATH'], '/'));
}
}
if ($directories_only) return '';
}
// plugins get one more chance
//
if (strpos($filename, 'plugins/') === 0) {
$plugin_name = substr($filename, 8, strpos($filename, '/', 8) - 8);
$file = substr($filename, strlen($plugin_name) + 9);
if (!$this->find_and_cache_plugin_template_file($plugin_name, $file))
return '';
//FIXME: technically I guess we should check for directories
// here too, but that's overkill (no need) presently
// (plugin-provided alternate stylesheet dirs?!? bah.)
}
// nothing... return empty string (yes, the else is intentional!)
//
else return '';
}
return SM_PATH . $this->template_file_cache[$filename]['PATH'];
}
/**
* Get template engine needed to render given template file.
*
* If at all possible, just returns a reference to $this, but
* some template files may require a different engine, thus
* an object for that engine (which will subsequently be kept
* in this object for future use) is returned.
*
* @param string $filename The name of the template file,
*
* @return object The needed template object to render the template.
*
*/
function get_rendering_template_engine_object($filename) {
// for files that we cannot find engine info for,
// just return $this
//
if (empty($this->template_file_cache[$filename]['ENGINE']))
return $this;
// otherwise, compare $this' engine to the file's engine
//
$engine = $this->template_file_cache[$filename]['ENGINE'];
if ($this->template_engine == $engine)
return $this;
// need to load another engine... if already instantiated,
// and stored herein, return that
// FIXME: this assumes same engine setup in all template
// set config files that have same engine in common
// (but keeping a separate class object for every
// template set seems like overkill... for now we
// won't do that unless it becomes a problem)
//
if (!empty($this->other_template_engine_objects[$engine])) {
$rendering_engine = $this->other_template_engine_objects[$engine];
// otherwise, instantiate new engine object, add to cache
// and return it
//
} else {
$template_set_id = $this->template_file_cache[$filename]['SET_ID'];
$this->other_template_engine_objects[$engine]
= $this->get_template_engine_subclass($template_set_id);
$rendering_engine = $this->other_template_engine_objects[$engine];
}
// now, need to copy over all the assigned variables
// from $this to the rendering engine (YUCK! -- we need
// to discourage template authors from creating
// situations where engine changes occur)
//
$rendering_engine->clear_all_assign();
$rendering_engine->assign($this->get_template_vars());
// finally ready to go
//
return $rendering_engine;
}
/**
* Return all JavaScript files provided by the template.
*
* All files found in the template set's "js" directory (and
* that of its ancestors) with the extension ".js" are returned.
*
* @param boolean $full_path When FALSE, only the file names
* are included in the return array;
* otherwise, path information is
* included (relative to SM_PATH)
* (OPTIONAL; default only file names)
*
* @return array The required file names/paths.
*
*/
function get_javascript_includes($full_path=FALSE) {
// since any page from a parent template set
// could end up being loaded, we have to load
// all js files from ancestor template sets,
// not just this set
//
//$directory = SM_PATH . $this->get_template_file_directory() . 'js';
//$js_files = list_files($directory, '.js', !$full_path);
//
$js_files = $this->get_template_file_path('js/');
// parse out .js files only
//
$return_array = array();
foreach ($js_files as $file) {
if (substr($file, strlen($file) - 3) != '.js') continue;
if ($full_path) {
$return_array[] = $file;
} else {
$return_array[] = basename($file);
}
}
return $return_array;
}
/**
* Return all alternate stylesheets provided by template.
*
* All (non-empty) directories found in the template set's
* "css/alternates" directory (and that of its ancestors)
* are returned.
*
* Note that prettified names are constructed herein by
* taking the directory name, changing underscores to spaces
* and capitalizing each word in the resultant name.
*
* @param boolean $full_path When FALSE, only the file names
* are included in the return array;
* otherwise, path information is
* included (relative to SM_PATH)
* (OPTIONAL; default only file names)
*
* @return array A list of the available alternate stylesheets,
* where the keys are the file names (formatted
* according to $full_path) for the stylesheets,
* and the values are the prettified version of
* the file names for display to the user.
*
*/
function get_alternative_stylesheets($full_path=FALSE) {
// since any page from a parent template set
// could end up being loaded, we will load
// all alternate css files from ancestor
// template sets, not just this set
//
$css_directories = $this->get_template_file_path('css/alternates/', TRUE, TRUE);
// prettify names
//
$return_array = array();
foreach ($css_directories as $directory) {
// CVS and SVN directories are not wanted
//
if ((strpos($directory, '/CVS') === strlen($directory) - 4)
|| (strpos($directory, '/.svn') === strlen($directory) - 5)) continue;
$pretty_name = ucwords(str_replace('_', ' ', basename($directory)));
if ($full_path) {
$return_array[$directory] = $pretty_name;
} else {
$return_array[basename($directory)] = $pretty_name;
}
}
return $return_array;
}
/**
* Return all standard stylsheets provided by the template.
*
* All files found in the template set's "css" directory (and
* that of its ancestors) with the extension ".css" except
* "rtl.css" (which is dealt with separately) are returned.
*
* @param boolean $full_path When FALSE, only the file names
* are included in the return array;
* otherwise, path information is
* included (relative to SM_PATH)
* (OPTIONAL; default only file names)
*
* @return array The required file names/paths.
*
*/
function get_stylesheets($full_path=FALSE) {
// since any page from a parent template set
// could end up being loaded, we have to load
// all css files from ancestor template sets,
// not just this set
//
//$directory = SM_PATH . $this->get_template_file_directory() . 'css';
//$css_files = list_files($directory, '.css', !$full_path);
//
$css_files = $this->get_template_file_path('css/');
// need to leave out "rtl.css"
//
$return_array = array();
foreach ($css_files as $file) {
if (substr($file, strlen($file) - 4) != '.css') continue;
if (strtolower(basename($file)) == 'rtl.css') continue;
if ($full_path) {
$return_array[] = $file;
} else {
$return_array[] = basename($file);
}
}
// return sheets for the current template set
// last so we can enable any custom overrides
// of styles in ancestor sheets
//
return array_reverse($return_array);
}
/**
* Generate links to all this template set's standard stylesheets
*
* Subclasses can override this function if stylesheets are
* created differently for the template set's target output
* interface.
*
* @return string The stylesheet links as they should be sent
* to the browser.
*
*/
function fetch_standard_stylesheet_links()
{
$sheets = $this->get_stylesheets(TRUE);
return $this->fetch_external_stylesheet_links($sheets);
}
/**
* Push out any other stylesheet links as provided (for
* stylesheets not included with the current template set)
*
* Subclasses can override this function if stylesheets are
* created differently for the template set's target output
* interface.
*
* @param mixed $sheets List of the desired stylesheets
* (file path to be used in stylesheet
* href attribute) to output (or single
* stylesheet file path).
FIXME: We could make the incoming array more complex so it can
also contain the other parameters for create_css_link()
such as $name, $alt, $mtype, and $xhtml_end
But do we need to?
*
* @return string The stylesheet links as they should be sent
* to the browser.
*
*/
function fetch_external_stylesheet_links($sheets)
{
if (!is_array($sheets)) $sheets = array($sheets);
$output = '';
foreach ($sheets as $sheet) {
$output .= create_css_link($sheet);
}
return $output;
}
/**
* Send HTTP header(s) to browser.
*
* Subclasses can override this function if headers are
* managed differently in the engine's target output
* interface.
*
* @param mixed $headers A list of (or a single) header
* text to be sent.
* @param boolean $replace Whether or not to replace header(s)
* previously sent header(s) of the
* same type (this parameter may be
* ignored in some implementations
* of this class if the target interface
* does not support this functionality)
* (OPTIONAL; default = TRUE, always replace).
*
*/
function header($headers, $replace=TRUE)
{
if (!is_array($headers)) $headers = array($headers);
foreach ($headers as $header) {
$this->assign('header', $header);
header($this->fetch('header.tpl'), $replace);
}
}
/**
* Generate a link to the right-to-left stylesheet for
* this template set by getting the "rtl.css" file from
* this template set, its parent (or grandparent, etc.)
* template set, the fall-back template set, or finally,
* fall back to SquirrelMail's own "rtl.css" if need be.
*
* Subclasses can override this function if stylesheets are
* created differently for the template set's target output
* interface.
*
* @return string The stylesheet link as it should be sent
* to the browser.
*
*/
function fetch_right_to_left_stylesheet_link()
{
// get right template file
//
$sheet = $this->get_template_file_path('css/rtl.css');
// fall back to SquirrelMail's own default stylesheet
//
if (empty($sheet)) {
$sheet = SM_PATH . 'css/rtl.css';
}
return create_css_link($sheet);
}
/**
* Display the template
*
* @param string $file The template file to use
*
*/
function display($file)
{
echo $this->fetch($file);
}
/**
* Applies the template and returns the resultant content string.
*
* @param string $file The template file to use
*
* @return string The template contents after applying the given template
*
*/
function fetch($file) {
// get right template file
//
$template = $this->get_template_file_path($file);
// special case stylesheet.tpl falls back to SquirrelMail's
// own default stylesheet
//
if (empty($template) && $file == 'css/stylesheet.tpl') {
$template = SM_PATH . 'css/default.css';
}
if (empty($template)) {
trigger_error('The template "' . sm_encode_html_special_chars($file)
. '" could not be fetched!', E_USER_ERROR);
} else {
$aPluginOutput = array();
$temp = array(&$aPluginOutput, &$this);
$aPluginOutput = concat_hook_function('template_construct_' . $file,
$temp, TRUE);
$this->assign('plugin_output', $aPluginOutput);
//$output = $this->apply_template($template);
$rendering_engine = $this->get_rendering_template_engine_object($file);
$output = $rendering_engine->apply_template($template);
// CAUTION: USE OF THIS HOOK IS HIGHLY DISCOURAGED AND CAN
// RESULT IN NOTICABLE PERFORMANCE DEGREDATION. Plugins
// using this hook will probably be rejected by the
// SquirrelMail team.
//
do_hook('template_output', $output);
return $output;
}
}
/**
* Assigns values to template variables
*
* Note: this is an abstract method that must be implemented by subclass.
*
* @param array|string$tpl_var the template variable name(s)
* @param mixed $value the value to assign
*
*/
function assign($tpl_var, $value = NULL) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the assign() method.', E_USER_ERROR);
}
/**
* Assigns values to template variables by reference
*
* Note: this is an abstract method that must be implemented by subclass.
*
* @param string $tpl_var the template variable name
* @param mixed $value the referenced value to assign
*
*/
function assign_by_ref($tpl_var, &$value) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the assign_by_ref() method.', E_USER_ERROR);
}
/**
* Clears the values of all assigned varaiables.
*
*/
function clear_all_assign() {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the clear_all_assign() method.', E_USER_ERROR);
}
/**
* Returns assigned variable value(s).
*
* @param string $varname If given, the value of that variable
* is returned, assuming it has been
* previously assigned. If not specified
* an array of all assigned variables is
* returned. (optional)
*
* @return mixed Desired single variable value or list of all
* assigned variable values.
*
*/
function get_template_vars($varname=NULL) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the get_template_vars() method.', E_USER_ERROR);
}
/**
* Appends values to template variables
*
* Note: this is an abstract method that must be implemented by subclass.
*
* @param array|string$tpl_var the template variable name(s)
* @param mixed $value the value to append
* @param boolean $merge when $value is given as an array,
* this indicates whether or not that
* array itself should be appended as
* a new template variable value or if
* that array's values should be merged
* into the existing array of template
* variable values
*
*/
function append($tpl_var, $value = NULL, $merge = FALSE) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the append() method.', E_USER_ERROR);
}
/**
* Appends values to template variables by reference
*
* Note: this is an abstract method that must be implemented by subclass.
*
* @param string $tpl_var the template variable name
* @param mixed $value the referenced value to append
* @param boolean $merge when $value is given as an array,
* this indicates whether or not that
* array itself should be appended as
* a new template variable value or if
* that array's values should be merged
* into the existing array of template
* variable values
*
*/
function append_by_ref($tpl_var, &$value, $merge = FALSE) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the append_by_ref() method.', E_USER_ERROR);
}
/**
* Applys the template and generates final output destined
* for the user's browser
*
* Note: this is an abstract method that must be implemented by subclass.
*
* @param string $filepath The full file path to the template to be applied
*
* @return string The output for the given template
*
*/
function apply_template($filepath) {
trigger_error('Template subclass (' . $this->template_engine . 'Template.class.php) needs to implement the apply_template() method.', E_USER_ERROR);
}
}

Documentation generated on Wed, 22 May 2013 04:21:05 +0200 by phpDocumentor 1.4.3

Source for file Template.class.php