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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Functions for generating the HTML that Moodle should output.
*
* Please see http://docs.moodle.org/en/Developement:How_Moodle_outputs_HTML
* for an overview.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package core
* @category output
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir.'/outputcomponents.php');
require_once($CFG->libdir.'/outputactions.php');
require_once($CFG->libdir.'/outputfactories.php');
require_once($CFG->libdir.'/outputrenderers.php');
require_once($CFG->libdir.'/outputrequirementslib.php');
/**
* Returns current theme revision number.
*
* @return int
*/
function theme_get_revision() {
global $CFG;
if (empty($CFG->themedesignermode)) {
if (empty($CFG->themerev)) {
// This only happens during install. It doesn't matter what themerev we use as long as it's positive.
return 1;
} else {
return $CFG->themerev;
}
} else {
return -1;
}
}
/**
* Returns current theme sub revision number. This is the revision for
* this theme exclusively, not the global theme revision.
*
* @param string $themename The non-frankenstyle name of the theme
* @return int
*/
function theme_get_sub_revision_for_theme($themename) {
global $CFG;
if (empty($CFG->themedesignermode)) {
$pluginname = "theme_{$themename}";
$revision = during_initial_install() ? null : get_config($pluginname, 'themerev');
if (empty($revision)) {
// This only happens during install. It doesn't matter what themerev we use as long as it's positive.
return 1;
} else {
return $revision;
}
} else {
return -1;
}
}
/**
* Calculates and returns the next theme revision number.
*
* @return int
*/
function theme_get_next_revision() {
global $CFG;
$next = time();
if (isset($CFG->themerev) and $next <= $CFG->themerev and $CFG->themerev - $next < 60*60) {
// This resolves problems when reset is requested repeatedly within 1s,
// the < 1h condition prevents accidental switching to future dates
// because we might not recover from it.
$next = $CFG->themerev+1;
}
return $next;
}
/**
* Calculates and returns the next theme revision number.
*
* @param string $themename The non-frankenstyle name of the theme
* @return int
*/
function theme_get_next_sub_revision_for_theme($themename) {
global $CFG;
$next = time();
$current = theme_get_sub_revision_for_theme($themename);
if ($next <= $current and $current - $next < 60 * 60) {
// This resolves problems when reset is requested repeatedly within 1s,
// the < 1h condition prevents accidental switching to future dates
// because we might not recover from it.
$next = $current + 1;
}
return $next;
}
/**
* Sets the current theme revision number.
*
* @param int $revision The new theme revision number
*/
function theme_set_revision($revision) {
set_config('themerev', $revision);
}
/**
* Sets the current theme revision number for a specific theme.
* This does not affect the global themerev value.
*
* @param string $themename The non-frankenstyle name of the theme
* @param int $revision The new theme revision number
*/
function theme_set_sub_revision_for_theme($themename, $revision) {
set_config('themerev', $revision, "theme_{$themename}");
}
/**
* Get the path to a theme config.php file.
*
* @param string $themename The non-frankenstyle name of the theme to check
*/
function theme_get_config_file_path($themename) {
global $CFG;
if (file_exists("{$CFG->dirroot}/theme/{$themename}/config.php")) {
return "{$CFG->dirroot}/theme/{$themename}/config.php";
} else if (!empty($CFG->themedir) and file_exists("{$CFG->themedir}/{$themename}/config.php")) {
return "{$CFG->themedir}/{$themename}/config.php";
} else {
return null;
}
}
/**
* Get the path to the local cached CSS file.
*
* @param string $themename The non-frankenstyle theme name.
* @param int $globalrevision The global theme revision.
* @param int $themerevision The theme specific revision.
* @param string $direction Either 'ltr' or 'rtl' (case sensitive).
*/
function theme_get_css_filename($themename, $globalrevision, $themerevision, $direction) {
global $CFG;
$path = "{$CFG->localcachedir}/theme/{$globalrevision}/{$themename}/css";
$filename = $direction == 'rtl' ? "all-rtl_{$themerevision}" : "all_{$themerevision}";
return "{$path}/{$filename}.css";
}
/**
* Generates and saves the CSS files for the given theme configs.
*
* @param theme_config[] $themeconfigs An array of theme_config instances.
* @param array $directions Must be a subset of ['rtl', 'ltr'].
* @param bool $cache Should the generated files be stored in local cache.
* @return array The built theme content in a multi-dimensional array of name => direction => content
*/
function theme_build_css_for_themes($themeconfigs = [], $directions = ['rtl', 'ltr'], $cache = true): array {
global $CFG;
if (empty($themeconfigs)) {
return [];
}
require_once("{$CFG->libdir}/csslib.php");
$themescss = [];
$themerev = theme_get_revision();
// Make sure the local cache directory exists.
make_localcache_directory('theme');
foreach ($themeconfigs as $themeconfig) {
$themecss = [];
$oldrevision = theme_get_sub_revision_for_theme($themeconfig->name);
$newrevision = theme_get_next_sub_revision_for_theme($themeconfig->name);
// First generate all the new css.
foreach ($directions as $direction) {
// Lock it on. Technically we should build all themes for SVG and no SVG - but ie9 is out of support.
$themeconfig->force_svg_use(true);
$themeconfig->set_rtl_mode(($direction === 'rtl'));
$themecss[$direction] = $themeconfig->get_css_content();
if ($cache) {
$themeconfig->set_css_content_cache($themecss[$direction]);
$filename = theme_get_css_filename($themeconfig->name, $themerev, $newrevision, $direction);
css_store_css($themeconfig, $filename, $themecss[$direction]);
}
}
$themescss[$themeconfig->name] = $themecss;
if ($cache) {
// Only update the theme revision after we've successfully created the
// new CSS cache.
theme_set_sub_revision_for_theme($themeconfig->name, $newrevision);
// Now purge old files. We must purge all old files in the local cache
// because we've incremented the theme sub revision. This will leave any
// files with the old revision inaccessbile so we might as well removed
// them from disk.
foreach (['ltr', 'rtl'] as $direction) {
$oldcss = theme_get_css_filename($themeconfig->name, $themerev, $oldrevision, $direction);
if (file_exists($oldcss)) {
unlink($oldcss);
}
}
}
}
return $themescss;
}
/**
* Invalidate all server and client side caches.
*
* This method deletes the physical directory that is used to cache the theme
* files used for serving.
* Because it deletes the main theme cache directory all themes are reset by
* this function.
*/
function theme_reset_all_caches() {
global $CFG, $PAGE;
require_once("{$CFG->libdir}/filelib.php");
$next = theme_get_next_revision();
theme_set_revision($next);
if (!empty($CFG->themedesignermode)) {
$cache = cache::make_from_params(cache_store::MODE_APPLICATION, 'core', 'themedesigner');
$cache->purge();
}
// Purge compiled post processed css.
cache::make('core', 'postprocessedcss')->purge();
// Delete all old theme localcaches.
$themecachedirs = glob("{$CFG->localcachedir}/theme/*", GLOB_ONLYDIR);
foreach ($themecachedirs as $localcachedir) {
fulldelete($localcachedir);
}
if ($PAGE) {
$PAGE->reload_theme();
}
}
/**
* Enable or disable theme designer mode.
*
* @param bool $state
*/
function theme_set_designer_mod($state) {
set_config('themedesignermode', (int)!empty($state));
// Reset caches after switching mode so that any designer mode caches get purged too.
theme_reset_all_caches();
}
/**
* Checks if the given device has a theme defined in config.php.
*
* @return bool
*/
function theme_is_device_locked($device) {
global $CFG;
$themeconfigname = core_useragent::get_device_type_cfg_var_name($device);
return isset($CFG->config_php_settings[$themeconfigname]);
}
/**
* Returns the theme named defined in config.php for the given device.
*
* @return string or null
*/
function theme_get_locked_theme_for_device($device) {
global $CFG;
if (!theme_is_device_locked($device)) {
return null;
}
$themeconfigname = core_useragent::get_device_type_cfg_var_name($device);
return $CFG->config_php_settings[$themeconfigname];
}
/**
* This class represents the configuration variables of a Moodle theme.
*
* All the variables with access: public below (with a few exceptions that are marked)
* are the properties you can set in your themes config.php file.
*
* There are also some methods and protected variables that are part of the inner
* workings of Moodle's themes system. If you are just editing a themes config.php
* file, you can just ignore those, and the following information for developers.
*
* Normally, to create an instance of this class, you should use the
* {@link theme_config::load()} factory method to load a themes config.php file.
* However, normally you don't need to bother, because moodle_page (that is, $PAGE)
* will create one for you, accessible as $PAGE->theme.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
* @package core
* @category output
*/
class theme_config {
/**
* @var string Default theme, used when requested theme not found.
*/
const DEFAULT_THEME = 'boost';
/** The key under which the SCSS file is stored amongst the CSS files. */
const SCSS_KEY = '__SCSS__';
/**
* @var array You can base your theme on other themes by linking to the other theme as
* parents. This lets you use the CSS and layouts from the other themes
* (see {@link theme_config::$layouts}).
* That makes it easy to create a new theme that is similar to another one
* but with a few changes. In this themes CSS you only need to override
* those rules you want to change.
*/
public $parents;
/**
* @var array The names of all the stylesheets from this theme that you would
* like included, in order. Give the names of the files without .css.
*/
public $sheets = array();
/**
* @var array The names of all the stylesheets from parents that should be excluded.
* true value may be used to specify all parents or all themes from one parent.
* If no value specified value from parent theme used.
*/
public $parents_exclude_sheets = null;
/**
* @var array List of plugin sheets to be excluded.
* If no value specified value from parent theme used.
*/
public $plugins_exclude_sheets = null;
/**
* @var array List of style sheets that are included in the text editor bodies.
* Sheets from parent themes are used automatically and can not be excluded.
*/
public $editor_sheets = array();
/**
* @var bool Whether a fallback version of the stylesheet will be used
* whilst the final version is generated.
*/
public $usefallback = false;
/**
* @var array The names of all the javascript files this theme that you would
* like included from head, in order. Give the names of the files without .js.
*/
public $javascripts = array();
/**
* @var array The names of all the javascript files this theme that you would
* like included from footer, in order. Give the names of the files without .js.
*/
public $javascripts_footer = array();
/**
* @var array The names of all the javascript files from parents that should
* be excluded. true value may be used to specify all parents or all themes
* from one parent.
* If no value specified value from parent theme used.
*/
public $parents_exclude_javascripts = null;
/**
* @var array Which file to use for each page layout.
*
* This is an array of arrays. The keys of the outer array are the different layouts.
* Pages in Moodle are using several different layouts like 'normal', 'course', 'home',
* 'popup', 'form', .... The most reliable way to get a complete list is to look at
* {@link http://cvs.moodle.org/moodle/theme/base/config.php?view=markup the base theme config.php file}.
* That file also has a good example of how to set this setting.
*
* For each layout, the value in the outer array is an array that describes
* how you want that type of page to look. For example
* <pre>
* $THEME->layouts = array(
* // Most pages - if we encounter an unknown or a missing page type, this one is used.
* 'standard' => array(
* 'theme' = 'mytheme',
* 'file' => 'normal.php',
* 'regions' => array('side-pre', 'side-post'),
* 'defaultregion' => 'side-post'
* ),
* // The site home page.
* 'home' => array(
* 'theme' = 'mytheme',
* 'file' => 'home.php',
* 'regions' => array('side-pre', 'side-post'),
* 'defaultregion' => 'side-post'
* ),
* // ...
* );
* </pre>
*
* 'theme' name of the theme where is the layout located
* 'file' is the layout file to use for this type of page.
* layout files are stored in layout subfolder
* 'regions' This lists the regions on the page where blocks may appear. For
* each region you list here, your layout file must include a call to
* <pre>
* echo $OUTPUT->blocks_for_region($regionname);
* </pre>
* or equivalent so that the blocks are actually visible.
*
* 'defaultregion' If the list of regions is non-empty, then you must pick
* one of the one of them as 'default'. This has two meanings. First, this is
* where new blocks are added. Second, if there are any blocks associated with
* the page, but in non-existent regions, they appear here. (Imaging, for example,
* that someone added blocks using a different theme that used different region
* names, and then switched to this theme.)
*/
public $layouts = array();
/**
* @var string Name of the renderer factory class to use. Must implement the
* {@link renderer_factory} interface.
*
* This is an advanced feature. Moodle output is generated by 'renderers',
* you can customise the HTML that is output by writing custom renderers,
* and then you need to specify 'renderer factory' so that Moodle can find
* your renderers.
*
* There are some renderer factories supplied with Moodle. Please follow these
* links to see what they do.
* <ul>
* <li>{@link standard_renderer_factory} - the default.</li>
* <li>{@link theme_overridden_renderer_factory} - use this if you want to write
* your own custom renderers in a lib.php file in this theme (or the parent theme).</li>
* </ul>
*/
public $rendererfactory = 'standard_renderer_factory';
/**
* @var string Function to do custom CSS post-processing.
*
* This is an advanced feature. If you want to do custom post-processing on the
* CSS before it is output (for example, to replace certain variable names
* with particular values) you can give the name of a function here.
*/
public $csspostprocess = null;
/**
* @var string Function to do custom CSS post-processing on a parsed CSS tree.
*
* This is an advanced feature. If you want to do custom post-processing on the
* CSS before it is output, you can provide the name of the function here. The
* function will receive a CSS tree document as first parameter, and the theme_config
* object as second parameter. A return value is not required, the tree can
* be edited in place.
*/
public $csstreepostprocessor = null;
/**
* @var string Accessibility: Right arrow-like character is
* used in the breadcrumb trail, course navigation menu
* (previous/next activity), calendar, and search forum block.
* If the theme does not set characters, appropriate defaults
* are set automatically. Please DO NOT
* use < > » - these are confusing for blind users.
*/
public $rarrow = null;
/**
* @var string Accessibility: Left arrow-like character is
* used in the breadcrumb trail, course navigation menu
* (previous/next activity), calendar, and search forum block.
* If the theme does not set characters, appropriate defaults
* are set automatically. Please DO NOT
* use < > » - these are confusing for blind users.
*/
public $larrow = null;
/**
* @var string Accessibility: Up arrow-like character is used in
* the book heirarchical navigation.
* If the theme does not set characters, appropriate defaults
* are set automatically. Please DO NOT
* use ^ - this is confusing for blind users.
*/
public $uarrow = null;
/**
* @var string Accessibility: Down arrow-like character.
* If the theme does not set characters, appropriate defaults
* are set automatically.
*/
public $darrow = null;
/**
* @var bool Some themes may want to disable ajax course editing.
*/
public $enablecourseajax = true;
/**
* @var string Determines served document types
* - 'html5' the only officially supported doctype in Moodle
* - 'xhtml5' may be used in development for validation (not intended for production servers!)
* - 'xhtml' XHTML 1.0 Strict for legacy themes only
*/
public $doctype = 'html5';
/**
* @var string requiredblocks If set to a string, will list the block types that cannot be deleted. Defaults to
* navigation and settings.
*/
public $requiredblocks = false;
//==Following properties are not configurable from theme config.php==
/**
* @var string The name of this theme. Set automatically when this theme is
* loaded. This can not be set in theme config.php
*/
public $name;
/**
* @var string The folder where this themes files are stored. This is set
* automatically. This can not be set in theme config.php
*/
public $dir;
/**
* @var stdClass Theme settings stored in config_plugins table.
* This can not be set in theme config.php
*/
public $settings = null;
/**
* @var bool If set to true and the theme enables the dock then blocks will be able
* to be moved to the special dock
*/
public $enable_dock = false;
/**
* @var bool If set to true then this theme will not be shown in the theme selector unless
* theme designer mode is turned on.
*/
public $hidefromselector = false;
/**
* @var array list of YUI CSS modules to be included on each page. This may be used
* to remove cssreset and use cssnormalise module instead.
*/
public $yuicssmodules = array('cssreset', 'cssfonts', 'cssgrids', 'cssbase');
/**
* An associative array of block manipulations that should be made if the user is using an rtl language.
* The key is the original block region, and the value is the block region to change to.
* This is used when displaying blocks for regions only.
* @var array
*/
public $blockrtlmanipulations = array();
/**
* @var renderer_factory Instance of the renderer_factory implementation
* we are using. Implementation detail.
*/
protected $rf = null;
/**
* @var array List of parent config objects.
**/
protected $parent_configs = array();
/**
* Used to determine whether we can serve SVG images or not.
* @var bool
*/
private $usesvg = null;
/**
* Whether in RTL mode or not.
* @var bool
*/
protected $rtlmode = false;
/**
* The SCSS file to compile (without .scss), located in the scss/ folder of the theme.
* Or a Closure, which receives the theme_config as argument and must
* return the SCSS content.
* @var string|Closure
*/
public $scss = false;
/**
* Local cache of the SCSS property.
* @var false|array
*/
protected $scsscache = null;
/**
* The name of the function to call to get the SCSS code to inject.
* @var string
*/
public $extrascsscallback = null;
/**
* The name of the function to call to get SCSS to prepend.
* @var string
*/
public $prescsscallback = null;
/**
* Sets the render method that should be used for rendering custom block regions by scripts such as my/index.php
* Defaults to {@link core_renderer::blocks_for_region()}
* @var string
*/
public $blockrendermethod = null;
/**
* Remember the results of icon remapping for the current page.
* @var array
*/
public $remapiconcache = [];
/**
* The name of the function to call to get precompiled CSS.
* @var string
*/
public $precompiledcsscallback = null;
/**
* Load the config.php file for a particular theme, and return an instance
* of this class. (That is, this is a factory method.)
*
* @param string $themename the name of the theme.
* @return theme_config an instance of this class.
*/
public static function load($themename) {
global $CFG;
// load theme settings from db
try {
$settings = get_config('theme_'.$themename);
} catch (dml_exception $e) {
// most probably moodle tables not created yet
$settings = new stdClass();
}
if ($config = theme_config::find_theme_config($themename, $settings)) {
return new theme_config($config);
} else if ($themename == theme_config::DEFAULT_THEME) {
throw new coding_exception('Default theme '.theme_config::DEFAULT_THEME.' not available or broken!');
} else if ($config = theme_config::find_theme_config($CFG->theme, $settings)) {
debugging('This page should be using theme ' . $themename .
' which cannot be initialised. Falling back to the site theme ' . $CFG->theme, DEBUG_NORMAL);
return new theme_config($config);
} else {
// bad luck, the requested theme has some problems - admin see details in theme config
debugging('This page should be using theme ' . $themename .
' which cannot be initialised. Nor can the site theme ' . $CFG->theme .
'. Falling back to ' . theme_config::DEFAULT_THEME, DEBUG_NORMAL);
return new theme_config(theme_config::find_theme_config(theme_config::DEFAULT_THEME, $settings));
}
}
/**
* Theme diagnostic code. It is very problematic to send debug output
* to the actual CSS file, instead this functions is supposed to
* diagnose given theme and highlights all potential problems.
* This information should be available from the theme selection page
* or some other debug page for theme designers.
*
* @param string $themename
* @return array description of problems
*/
public static function diagnose($themename) {
//TODO: MDL-21108
return array();
}
/**
* Private constructor, can be called only from the factory method.
* @param stdClass $config
*/
private function __construct($config) {
global $CFG; //needed for included lib.php files
$this->settings = $config->settings;
$this->name = $config->name;
$this->dir = $config->dir;
if ($this->name != self::DEFAULT_THEME) {
$baseconfig = self::find_theme_config(self::DEFAULT_THEME, $this->settings);
} else {
$baseconfig = $config;
}
$configurable = array(
'parents', 'sheets', 'parents_exclude_sheets', 'plugins_exclude_sheets', 'usefallback',
'javascripts', 'javascripts_footer', 'parents_exclude_javascripts',
'layouts', 'enablecourseajax', 'requiredblocks',
'rendererfactory', 'csspostprocess', 'editor_sheets', 'editor_scss', 'rarrow', 'larrow', 'uarrow', 'darrow',
'hidefromselector', 'doctype', 'yuicssmodules', 'blockrtlmanipulations', 'blockrendermethod',
'scss', 'extrascsscallback', 'prescsscallback', 'csstreepostprocessor', 'addblockposition',
'iconsystem', 'precompiledcsscallback');
foreach ($config as $key=>$value) {
if (in_array($key, $configurable)) {
$this->$key = $value;
}
}
// verify all parents and load configs and renderers
foreach ($this->parents as $parent) {
if (!$parent_config = theme_config::find_theme_config($parent, $this->settings)) {
// this is not good - better exclude faulty parents
continue;
}
$libfile = $parent_config->dir.'/lib.php';
if (is_readable($libfile)) {
// theme may store various function here
include_once($libfile);
}
$renderersfile = $parent_config->dir.'/renderers.php';
if (is_readable($renderersfile)) {
// may contain core and plugin renderers and renderer factory
include_once($renderersfile);
}
$this->parent_configs[$parent] = $parent_config;
}
$libfile = $this->dir.'/lib.php';
if (is_readable($libfile)) {
// theme may store various function here
include_once($libfile);
}
$rendererfile = $this->dir.'/renderers.php';
if (is_readable($rendererfile)) {
// may contain core and plugin renderers and renderer factory
include_once($rendererfile);
} else {
// check if renderers.php file is missnamed renderer.php
if (is_readable($this->dir.'/renderer.php')) {
debugging('Developer hint: '.$this->dir.'/renderer.php should be renamed to ' . $this->dir."/renderers.php.
See: http://docs.moodle.org/dev/Output_renderers#Theme_renderers.", DEBUG_DEVELOPER);
}
}
// cascade all layouts properly
foreach ($baseconfig->layouts as $layout=>$value) {
if (!isset($this->layouts[$layout])) {
foreach ($this->parent_configs as $parent_config) {
if (isset($parent_config->layouts[$layout])) {
$this->layouts[$layout] = $parent_config->layouts[$layout];
continue 2;
}
}
$this->layouts[$layout] = $value;
}
}
//fix arrows if needed
$this->check_theme_arrows();
}
/**
* Let the theme initialise the page object (usually $PAGE).
*
* This may be used for example to request jQuery in add-ons.
*
* @param moodle_page $page
*/
public function init_page(moodle_page $page) {
$themeinitfunction = 'theme_'.$this->name.'_page_init';
if (function_exists($themeinitfunction)) {
$themeinitfunction($page);
}
}
/**
* Checks if arrows $THEME->rarrow, $THEME->larrow, $THEME->uarrow, $THEME->darrow have been set (theme/-/config.php).
* If not it applies sensible defaults.
*
* Accessibility: right and left arrow Unicode characters for breadcrumb, calendar,
* search forum block, etc. Important: these are 'silent' in a screen-reader
* (unlike > »), and must be accompanied by text.
*/
private function check_theme_arrows() {
if (!isset($this->rarrow) and !isset($this->larrow)) {
// Default, looks good in Win XP/IE 6, Win/Firefox 1.5, Win/Netscape 8...
// Also OK in Win 9x/2K/IE 5.x
$this->rarrow = '►';
$this->larrow = '◄';
$this->uarrow = '▲';
$this->darrow = '▼';
if (empty($_SERVER['HTTP_USER_AGENT'])) {
$uagent = '';
} else {
$uagent = $_SERVER['HTTP_USER_AGENT'];
}
if (false !== strpos($uagent, 'Opera')
|| false !== strpos($uagent, 'Mac')) {
// Looks good in Win XP/Mac/Opera 8/9, Mac/Firefox 2, Camino, Safari.
// Not broken in Mac/IE 5, Mac/Netscape 7 (?).
$this->rarrow = '▶︎';
$this->larrow = '◀︎';
}
elseif ((false !== strpos($uagent, 'Konqueror'))
|| (false !== strpos($uagent, 'Android'))) {
// The fonts on Android don't include the characters required for this to work as expected.
// So we use the same ones Konqueror uses.
$this->rarrow = '→';
$this->larrow = '←';
$this->uarrow = '↑';
$this->darrow = '↓';
}
elseif (isset($_SERVER['HTTP_ACCEPT_CHARSET'])
&& false === stripos($_SERVER['HTTP_ACCEPT_CHARSET'], 'utf-8')) {
// (Win/IE 5 doesn't set ACCEPT_CHARSET, but handles Unicode.)
// To be safe, non-Unicode browsers!
$this->rarrow = '>';
$this->larrow = '<';
$this->uarrow = '^';
$this->darrow = 'v';
}
// RTL support - in RTL languages, swap r and l arrows
if (right_to_left()) {
$t = $this->rarrow;
$this->rarrow = $this->larrow;
$this->larrow = $t;
}
}
}
/**
* Returns output renderer prefixes, these are used when looking
* for the overridden renderers in themes.
*
* @return array
*/
public function renderer_prefixes() {
global $CFG; // just in case the included files need it
$prefixes = array('theme_'.$this->name);
foreach ($this->parent_configs as $parent) {
$prefixes[] = 'theme_'.$parent->name;
}
return $prefixes;
}
/**
* Returns the stylesheet URL of this editor content
*
* @param bool $encoded false means use & and true use & in URLs
* @return moodle_url
*/
public function editor_css_url($encoded=true) {
global $CFG;
$rev = theme_get_revision();
if ($rev > -1) {
$themesubrevision = theme_get_sub_revision_for_theme($this->name);
// Provide the sub revision to allow us to invalidate cached theme CSS
// on a per theme basis, rather than globally.
if ($themesubrevision && $themesubrevision > 0) {
$rev .= "_{$themesubrevision}";
}
$url = new moodle_url("/theme/styles.php");
if (!empty($CFG->slasharguments)) {
$url->set_slashargument('/'.$this->name.'/'.$rev.'/editor', 'noparam', true);
} else {
$url->params(array('theme'=>$this->name,'rev'=>$rev, 'type'=>'editor'));
}
} else {
$params = array('theme'=>$this->name, 'type'=>'editor');
$url = new moodle_url('/theme/styles_debug.php', $params);
}
return $url;
}
/**
* Returns the content of the CSS to be used in editor content
*
* @return array
*/
public function editor_css_files() {
$files = array();
// First editor plugins.
$plugins = core_component::get_plugin_list('editor');
foreach ($plugins as $plugin=>$fulldir) {
$sheetfile = "$fulldir/editor_styles.css";
if (is_readable($sheetfile)) {
$files['plugin_'.$plugin] = $sheetfile;
}
}
// Then parent themes - base first, the immediate parent last.
foreach (array_reverse($this->parent_configs) as $parent_config) {
if (empty($parent_config->editor_sheets)) {
continue;
}
foreach ($parent_config->editor_sheets as $sheet) {
$sheetfile = "$parent_config->dir/style/$sheet.css";
if (is_readable($sheetfile)) {
$files['parent_'.$parent_config->name.'_'.$sheet] = $sheetfile;
}
}
}
// Finally this theme.
if (!empty($this->editor_sheets)) {
foreach ($this->editor_sheets as $sheet) {
$sheetfile = "$this->dir/style/$sheet.css";
if (is_readable($sheetfile)) {
$files['theme_'.$sheet] = $sheetfile;
}
}
}
return $files;
}
/**
* Compiles and returns the content of the SCSS to be used in editor content
*
* @return string Compiled CSS from the editor SCSS
*/
public function editor_scss_to_css() {
$css = '';
$dir = $this->dir;
$filenames = [];
// Use editor_scss file(s) provided by this theme if set.
if (!empty($this->editor_scss)) {
$filenames = $this->editor_scss;
} else {
// If no editor_scss set, move up theme hierarchy until one is found (if at all).
// This is so child themes only need to set editor_scss if an override is required.
foreach (array_reverse($this->parent_configs) as $parentconfig) {
if (!empty($parentconfig->editor_scss)) {
$dir = $parentconfig->dir;
$filenames = $parentconfig->editor_scss;
// Config found, stop looking.
break;
}
}
}
if (!empty($filenames)) {
$compiler = new core_scss();
foreach ($filenames as $filename) {
$compiler->set_file("{$dir}/scss/{$filename}.scss");
try {
$css .= $compiler->to_css();
} catch (\Exception $e) {
debugging('Error while compiling editor SCSS: ' . $e->getMessage(), DEBUG_DEVELOPER);
}
}
}
return $css;
}
/**
* Get the stylesheet URL of this theme.
*
* @param moodle_page $page Not used... deprecated?
* @return moodle_url[]
*/
public function css_urls(moodle_page $page) {
global $CFG;
$rev = theme_get_revision();
$urls = array();
$svg = $this->use_svg_icons();
$separate = (core_useragent::is_ie() && !core_useragent::check_ie_version('10'));
if ($rev > -1) {
$filename = right_to_left() ? 'all-rtl' : 'all';
$url = new moodle_url("/theme/styles.php");
$themesubrevision = theme_get_sub_revision_for_theme($this->name);
// Provide the sub revision to allow us to invalidate cached theme CSS
// on a per theme basis, rather than globally.
if ($themesubrevision && $themesubrevision > 0) {
$rev .= "_{$themesubrevision}";
}
if (!empty($CFG->slasharguments)) {
$slashargs = '';
if (!$svg) {
// We add a simple /_s to the start of the path.
// The underscore is used to ensure that it isn't a valid theme name.
$slashargs .= '/_s'.$slashargs;
}
$slashargs .= '/'.$this->name.'/'.$rev.'/'.$filename;
if ($separate) {
$slashargs .= '/chunk0';
}
$url->set_slashargument($slashargs, 'noparam', true);
} else {
$params = array('theme' => $this->name, 'rev' => $rev, 'type' => $filename);
if (!$svg) {
// We add an SVG param so that we know not to serve SVG images.
// We do this because all modern browsers support SVG and this param will one day be removed.
$params['svg'] = '0';
}
if ($separate) {
$params['chunk'] = '0';
}
$url->params($params);
}
$urls[] = $url;
} else {
$baseurl = new moodle_url('/theme/styles_debug.php');
$css = $this->get_css_files(true);
if (!$svg) {
// We add an SVG param so that we know not to serve SVG images.
// We do this because all modern browsers support SVG and this param will one day be removed.
$baseurl->param('svg', '0');
}
if (right_to_left()) {
$baseurl->param('rtl', 1);
}
if ($separate) {
// We might need to chunk long files.
$baseurl->param('chunk', '0');
}
if (core_useragent::is_ie()) {
// Lalala, IE does not allow more than 31 linked CSS files from main document.
$urls[] = new moodle_url($baseurl, array('theme'=>$this->name, 'type'=>'ie', 'subtype'=>'plugins'));
foreach ($css['parents'] as $parent=>$sheets) {
// We need to serve parents individually otherwise we may easily exceed the style limit IE imposes (4096).
$urls[] = new moodle_url($baseurl, array('theme'=>$this->name,'type'=>'ie', 'subtype'=>'parents', 'sheet'=>$parent));
}
if ($this->get_scss_property()) {
// No need to define the type as IE here.
$urls[] = new moodle_url($baseurl, array('theme' => $this->name, 'type' => 'scss'));
}
$urls[] = new moodle_url($baseurl, array('theme'=>$this->name, 'type'=>'ie', 'subtype'=>'theme'));
} else {
foreach ($css['plugins'] as $plugin=>$unused) {
$urls[] = new moodle_url($baseurl, array('theme'=>$this->name,'type'=>'plugin', 'subtype'=>$plugin));
}
foreach ($css['parents'] as $parent=>$sheets) {
foreach ($sheets as $sheet=>$unused2) {
$urls[] = new moodle_url($baseurl, array('theme'=>$this->name,'type'=>'parent', 'subtype'=>$parent, 'sheet'=>$sheet));
}
}
foreach ($css['theme'] as $sheet => $filename) {
if ($sheet === self::SCSS_KEY) {
// This is the theme SCSS file.
$urls[] = new moodle_url($baseurl, array('theme' => $this->name, 'type' => 'scss'));
} else {
// Sheet first in order to make long urls easier to read.
$urls[] = new moodle_url($baseurl, array('sheet'=>$sheet, 'theme'=>$this->name, 'type'=>'theme'));
}
}
}
}
// Allow themes to change the css url to something like theme/mytheme/mycss.php.
component_callback('theme_' . $this->name, 'alter_css_urls', [&$urls]);
return $urls;
}
/**
* Get the whole css stylesheet for production mode.
*
* NOTE: this method is not expected to be used from any addons.
*
* @return string CSS markup compressed
*/
public function get_css_content() {
$csscontent = '';
foreach ($this->get_css_files(false) as $type => $value) {
foreach ($value as $identifier => $val) {
if (is_array($val)) {
foreach ($val as $v) {
$csscontent .= file_get_contents($v) . "\n";
}
} else {
if ($type === 'theme' && $identifier === self::SCSS_KEY) {
// We need the content from SCSS because this is the SCSS file from the theme.
if ($compiled = $this->get_css_content_from_scss(false)) {
$csscontent .= $compiled;
} else {
// The compiler failed so default back to any precompiled css that might
// exist.
$csscontent .= $this->get_precompiled_css_content();
}
} else {
$csscontent .= file_get_contents($val) . "\n";
}
}
}
}
$csscontent = $this->post_process($csscontent);
$csscontent = core_minify::css($csscontent);
return $csscontent;
}
/**
* Set post processed CSS content cache.
*
* @param string $csscontent The post processed CSS content.
* @return bool True if the content was successfully cached.
*/
public function set_css_content_cache($csscontent) {
$cache = cache::make('core', 'postprocessedcss');
$key = $this->get_css_cache_key();
return $cache->set($key, $csscontent);
}
/**
* Return whether the post processed CSS content has been cached.
*
* @return bool Whether the post-processed CSS is available in the cache.
*/
public function has_css_cached_content() {
$key = $this->get_css_cache_key();
$cache = cache::make('core', 'postprocessedcss');
return $cache->has($key);
}
/**
* Return cached post processed CSS content.
*
* @return bool|string The cached css content or false if not found.
*/
public function get_css_cached_content() {
$key = $this->get_css_cache_key();
$cache = cache::make('core', 'postprocessedcss');
return $cache->get($key);
}
/**
* Generate the css content cache key.
*
* @return string The post processed css cache key.
*/
public function get_css_cache_key() {
$nosvg = (!$this->use_svg_icons()) ? 'nosvg_' : '';
$rtlmode = ($this->rtlmode == true) ? 'rtl' : 'ltr';
return $nosvg . $this->name . '_' . $rtlmode;
}
/**
* Get the theme designer css markup,
* the parameters are coming from css_urls().
*
* NOTE: this method is not expected to be used from any addons.
*
* @param string $type
* @param string $subtype
* @param string $sheet
* @return string CSS markup
*/
public function get_css_content_debug($type, $subtype, $sheet) {
if ($type === 'scss') {
// The SCSS file of the theme is requested.
$csscontent = $this->get_css_content_from_scss(true);
if ($csscontent !== false) {
return $this->post_process($csscontent);
}
return '';
}
$cssfiles = array();
$css = $this->get_css_files(true);
if ($type === 'ie') {
// IE is a sloppy browser with weird limits, sorry.
if ($subtype === 'plugins') {
$cssfiles = $css['plugins'];
} else if ($subtype === 'parents') {
if (empty($sheet)) {
// Do not bother with the empty parent here.
} else {
// Build up the CSS for that parent so we can serve it as one file.
foreach ($css[$subtype][$sheet] as $parent => $css) {
$cssfiles[] = $css;
}
}
} else if ($subtype === 'theme') {
$cssfiles = $css['theme'];
foreach ($cssfiles as $key => $value) {
if (in_array($key, [self::SCSS_KEY])) {
// Remove the SCSS file from the theme CSS files.
// The SCSS files use the type 'scss', not 'ie'.
unset($cssfiles[$key]);
}
}
}
} else if ($type === 'plugin') {
if (isset($css['plugins'][$subtype])) {
$cssfiles[] = $css['plugins'][$subtype];
}
} else if ($type === 'parent') {
if (isset($css['parents'][$subtype][$sheet])) {
$cssfiles[] = $css['parents'][$subtype][$sheet];
}
} else if ($type === 'theme') {
if (isset($css['theme'][$sheet])) {
$cssfiles[] = $css['theme'][$sheet];
}
}
$csscontent = '';
foreach ($cssfiles as $file) {
$contents = file_get_contents($file);
$contents = $this->post_process($contents);
$comment = "/** Path: $type $subtype $sheet.' **/\n";
$stats = '';
$csscontent .= $comment.$stats.$contents."\n\n";
}
return $csscontent;
}
/**
* Get the whole css stylesheet for editor iframe.
*
* NOTE: this method is not expected to be used from any addons.
*
* @return string CSS markup
*/
public function get_css_content_editor() {
$css = '';
$cssfiles = $this->editor_css_files();
// If editor has static CSS, include it.
foreach ($cssfiles as $file) {
$css .= file_get_contents($file)."\n";
}
// If editor has SCSS, compile and include it.
if (($convertedscss = $this->editor_scss_to_css())) {
$css .= $convertedscss;
}
$output = $this->post_process($css);
return $output;
}
/**
* Returns an array of organised CSS files required for this output.
*
* @param bool $themedesigner
* @return array nested array of file paths
*/
protected function get_css_files($themedesigner) {
global $CFG;
$cache = null;
$cachekey = 'cssfiles';
if ($themedesigner) {
require_once($CFG->dirroot.'/lib/csslib.php');
// We need some kind of caching here because otherwise the page navigation becomes
// way too slow in theme designer mode. Feel free to create full cache definition later...
$cache = cache::make_from_params(cache_store::MODE_APPLICATION, 'core', 'themedesigner', array('theme' => $this->name));
if ($files = $cache->get($cachekey)) {
if ($files['created'] > time() - THEME_DESIGNER_CACHE_LIFETIME) {
unset($files['created']);
return $files;
}
}
}
$cssfiles = array('plugins'=>array(), 'parents'=>array(), 'theme'=>array());
// Get all plugin sheets.
$excludes = $this->resolve_excludes('plugins_exclude_sheets');
if ($excludes !== true) {
foreach (core_component::get_plugin_types() as $type=>$unused) {
if ($type === 'theme' || (!empty($excludes[$type]) and $excludes[$type] === true)) {
continue;
}
$plugins = core_component::get_plugin_list($type);
foreach ($plugins as $plugin=>$fulldir) {
if (!empty($excludes[$type]) and is_array($excludes[$type])
and in_array($plugin, $excludes[$type])) {
continue;
}
// Get the CSS from the plugin.
$sheetfile = "$fulldir/styles.css";
if (is_readable($sheetfile)) {
$cssfiles['plugins'][$type.'_'.$plugin] = $sheetfile;
}
// Create a list of candidate sheets from parents (direct parent last) and current theme.
$candidates = array();
foreach (array_reverse($this->parent_configs) as $parent_config) {
$candidates[] = $parent_config->name;
}
$candidates[] = $this->name;
// Add the sheets found.
foreach ($candidates as $candidate) {
$sheetthemefile = "$fulldir/styles_{$candidate}.css";
if (is_readable($sheetthemefile)) {
$cssfiles['plugins'][$type.'_'.$plugin.'_'.$candidate] = $sheetthemefile;
}
}
}
}
}
// Find out wanted parent sheets.
$excludes = $this->resolve_excludes('parents_exclude_sheets');
if ($excludes !== true) {
foreach (array_reverse($this->parent_configs) as $parent_config) { // Base first, the immediate parent last.
$parent = $parent_config->name;
if (empty($parent_config->sheets) || (!empty($excludes[$parent]) and $excludes[$parent] === true)) {
continue;
}
foreach ($parent_config->sheets as $sheet) {
if (!empty($excludes[$parent]) && is_array($excludes[$parent])
&& in_array($sheet, $excludes[$parent])) {
continue;
}
// We never refer to the parent LESS files.
$sheetfile = "$parent_config->dir/style/$sheet.css";
if (is_readable($sheetfile)) {
$cssfiles['parents'][$parent][$sheet] = $sheetfile;
}
}
}
}
// Current theme sheets.
// We first add the SCSS file because we want the CSS ones to
// be included after the SCSS code.
if ($this->get_scss_property()) {
$cssfiles['theme'][self::SCSS_KEY] = true;
}
if (is_array($this->sheets)) {
foreach ($this->sheets as $sheet) {
$sheetfile = "$this->dir/style/$sheet.css";
if (is_readable($sheetfile) && !isset($cssfiles['theme'][$sheet])) {
$cssfiles['theme'][$sheet] = $sheetfile;
}
}
}
if ($cache) {
$files = $cssfiles;
$files['created'] = time();
$cache->set($cachekey, $files);
}
return $cssfiles;
}
/**
* Return the CSS content generated from the SCSS file.
*
* @param bool $themedesigner True if theme designer is enabled.
* @return bool|string Return false when the compilation failed. Else the compiled string.
*/
protected function get_css_content_from_scss($themedesigner) {
global $CFG;
list($paths, $scss) = $this->get_scss_property();
if (!$scss) {
throw new coding_exception('The theme did not define a SCSS file, or it is not readable.');
}
// We might need more memory/time to do this, so let's play safe.
raise_memory_limit(MEMORY_EXTRA);
core_php_time_limit::raise(300);
// TODO: MDL-62757 When changing anything in this method please do not forget to check
// if the validate() method in class admin_setting_configthemepreset needs updating too.
$cacheoptions = '';
if ($themedesigner) {
$scsscachedir = $CFG->localcachedir . '/scsscache/';
$cacheoptions = array(
'cacheDir' => $scsscachedir,
'prefix' => 'scssphp_',
'forceRefresh' => false,
);
}
// Set-up the compiler.
$compiler = new core_scss($cacheoptions);
$compiler->prepend_raw_scss($this->get_pre_scss_code());
if (is_string($scss)) {
$compiler->set_file($scss);
} else {
$compiler->append_raw_scss($scss($this));
$compiler->setImportPaths($paths);
}
$compiler->append_raw_scss($this->get_extra_scss_code());
try {
// Compile!
$compiled = $compiler->to_css();
} catch (\Exception $e) {
$compiled = false;
debugging('Error while compiling SCSS: ' . $e->getMessage(), DEBUG_DEVELOPER);
}
// Try to save memory.
$compiler = null;
unset($compiler);
return $compiled;
}
/**
* Return the precompiled CSS if the precompiledcsscallback exists.
*
* @return string Return compiled css.
*/
public function get_precompiled_css_content() {
$configs = array_reverse($this->parent_configs) + [$this];
$css = '';
foreach ($configs as $config) {
if (isset($config->precompiledcsscallback)) {
$function = $config->precompiledcsscallback;
if (function_exists($function)) {
$css .= $function($this);
}
}
}
return $css;
}
/**
* Get the icon system to use.
*
* @return string
*/
public function get_icon_system() {
// Getting all the candidate functions.
$system = false;
if (isset($this->iconsystem) && \core\output\icon_system::is_valid_system($this->iconsystem)) {
return $this->iconsystem;
}
foreach ($this->parent_configs as $parent_config) {
if (isset($parent_config->iconsystem) && \core\output\icon_system::is_valid_system($parent_config->iconsystem)) {
return $parent_config->iconsystem;
}
}
return \core\output\icon_system::STANDARD;
}
/**
* Return extra SCSS code to add when compiling.
*
* This is intended to be used by themes to inject some SCSS code
* before it gets compiled. If you want to inject variables you
* should use {@link self::get_scss_variables()}.
*
* @return string The SCSS code to inject.
*/
public function get_extra_scss_code() {
$content = '';
// Getting all the candidate functions.
$candidates = array();
foreach ($this->parent_configs as $parent_config) {
if (!isset($parent_config->extrascsscallback)) {
continue;
}
$candidates[] = $parent_config->extrascsscallback;
}
$candidates[] = $this->extrascsscallback;
// Calling the functions.
foreach ($candidates as $function) {
if (function_exists($function)) {
$content .= "\n/** Extra SCSS from $function **/\n" . $function($this) . "\n";
}
}
return $content;
}
/**
* SCSS code to prepend when compiling.
*
* This is intended to be used by themes to inject SCSS code before it gets compiled.
*
* @return string The SCSS code to inject.
*/
public function get_pre_scss_code() {
$content = '';
// Getting all the candidate functions.
$candidates = array();
foreach ($this->parent_configs as $parent_config) {
if (!isset($parent_config->prescsscallback)) {
continue;
}
$candidates[] = $parent_config->prescsscallback;
}
$candidates[] = $this->prescsscallback;
// Calling the functions.
foreach ($candidates as $function) {
if (function_exists($function)) {
$content .= "\n/** Pre-SCSS from $function **/\n" . $function($this) . "\n";
}
}
return $content;
}
/**
* Get the SCSS property.
*
* This resolves whether a SCSS file (or content) has to be used when generating
* the stylesheet for the theme. It will look at parents themes and check the
* SCSS properties there.
*
* @return False when SCSS is not used.
* An array with the import paths, and the path to the SCSS file or Closure as second.
*/
public function get_scss_property() {
if ($this->scsscache === null) {
$configs = [$this] + $this->parent_configs;
$scss = null;
foreach ($configs as $config) {
$path = "{$config->dir}/scss";
// We collect the SCSS property until we've found one.
if (empty($scss) && !empty($config->scss)) {
$candidate = is_string($config->scss) ? "{$path}/{$config->scss}.scss" : $config->scss;
if ($candidate instanceof Closure) {
$scss = $candidate;
} else if (is_string($candidate) && is_readable($candidate)) {
$scss = $candidate;
}
}
// We collect the import paths once we've found a SCSS property.
if ($scss && is_dir($path)) {
$paths[] = $path;
}
}
$this->scsscache = $scss !== null ? [$paths, $scss] : false;
}
return $this->scsscache;
}
/**
* Generate a URL to the file that serves theme JavaScript files.
*
* If we determine that the theme has no relevant files, then we return
* early with a null value.
*
* @param bool $inhead true means head url, false means footer
* @return moodle_url|null
*/
public function javascript_url($inhead) {
global $CFG;
$rev = theme_get_revision();
$params = array('theme'=>$this->name,'rev'=>$rev);
$params['type'] = $inhead ? 'head' : 'footer';
// Return early if there are no files to serve
if (count($this->javascript_files($params['type'])) === 0) {
return null;
}
if (!empty($CFG->slasharguments) and $rev > 0) {
$url = new moodle_url("/theme/javascript.php");
$url->set_slashargument('/'.$this->name.'/'.$rev.'/'.$params['type'], 'noparam', true);
return $url;
} else {
return new moodle_url('/theme/javascript.php', $params);
}
}
/**
* Get the URL's for the JavaScript files used by this theme.
* They won't be served directly, instead they'll be mediated through
* theme/javascript.php.
*
* @param string $type Either javascripts_footer, or javascripts
* @return array
*/
public function javascript_files($type) {
if ($type === 'footer') {
$type = 'javascripts_footer';
} else {
$type = 'javascripts';
}
$js = array();
// find out wanted parent javascripts
$excludes = $this->resolve_excludes('parents_exclude_javascripts');
if ($excludes !== true) {
foreach (array_reverse($this->parent_configs) as $parent_config) { // base first, the immediate parent last
$parent = $parent_config->name;
if (empty($parent_config->$type)) {
continue;
}
if (!empty($excludes[$parent]) and $excludes[$parent] === true) {
continue;
}
foreach ($parent_config->$type as $javascript) {
if (!empty($excludes[$parent]) and is_array($excludes[$parent])
and in_array($javascript, $excludes[$parent])) {
continue;
}
$javascriptfile = "$parent_config->dir/javascript/$javascript.js";
if (is_readable($javascriptfile)) {
$js[] = $javascriptfile;
}
}
}
}
// current theme javascripts
if (is_array($this->$type)) {
foreach ($this->$type as $javascript) {
$javascriptfile = "$this->dir/javascript/$javascript.js";
if (is_readable($javascriptfile)) {
$js[] = $javascriptfile;
}
}
}
return $js;
}
/**
* Resolves an exclude setting to the themes setting is applicable or the
* setting of its closest parent.
*
* @param string $variable The name of the setting the exclude setting to resolve
* @param string $default
* @return mixed
*/
protected function resolve_excludes($variable, $default = null) {
$setting = $default;
if (is_array($this->{$variable}) or $this->{$variable} === true) {
$setting = $this->{$variable};
} else {
foreach ($this->parent_configs as $parent_config) { // the immediate parent first, base last
if (!isset($parent_config->{$variable})) {
continue;
}
if (is_array($parent_config->{$variable}) or $parent_config->{$variable} === true) {
$setting = $parent_config->{$variable};
break;
}
}
}
return $setting;
}
/**
* Returns the content of the one huge javascript file merged from all theme javascript files.
*
* @param bool $type
* @return string
*/
public function javascript_content($type) {
$jsfiles = $this->javascript_files($type);
$js = '';
foreach ($jsfiles as $jsfile) {
$js .= file_get_contents($jsfile)."\n";
}
return $js;
}
/**
* Post processes CSS.
*
* This method post processes all of the CSS before it is served for this theme.
* This is done so that things such as image URL's can be swapped in and to
* run any specific CSS post process method the theme has requested.
* This allows themes to use CSS settings.
*
* @param string $css The CSS to process.
* @return string The processed CSS.
*/
public function post_process($css) {
// now resolve all image locations
if (preg_match_all('/\[\[pix:([a-z0-9_]+\|)?([^\]]+)\]\]/', $css, $matches, PREG_SET_ORDER)) {
$replaced = array();
foreach ($matches as $match) {
if (isset($replaced[$match[0]])) {
continue;
}
$replaced[$match[0]] = true;
$imagename = $match[2];
$component = rtrim($match[1], '|');
$imageurl = $this->image_url($imagename, $component)->out(false);
// we do not need full url because the image.php is always in the same dir
$imageurl = preg_replace('|^http.?://[^/]+|', '', $imageurl);
$css = str_replace($match[0], $imageurl, $css);
}
}
// Now resolve all font locations.
if (preg_match_all('/\[\[font:([a-z0-9_]+\|)?([^\]]+)\]\]/', $css, $matches, PREG_SET_ORDER)) {
$replaced = array();
foreach ($matches as $match) {
if (isset($replaced[$match[0]])) {
continue;
}
$replaced[$match[0]] = true;
$fontname = $match[2];
$component = rtrim($match[1], '|');
$fonturl = $this->font_url($fontname, $component)->out(false);
// We do not need full url because the font.php is always in the same dir.
$fonturl = preg_replace('|^http.?://[^/]+|', '', $fonturl);
$css = str_replace($match[0], $fonturl, $css);
}
}
// Now resolve all theme settings or do any other postprocessing.
// This needs to be done before calling core parser, since the parser strips [[settings]] tags.
$csspostprocess = $this->csspostprocess;
if (function_exists($csspostprocess)) {
$css = $csspostprocess($css, $this);
}
// Post processing using an object representation of CSS.
$treeprocessor = $this->get_css_tree_post_processor();
$needsparsing = !empty($treeprocessor) || !empty($this->rtlmode);
if ($needsparsing) {
// We might need more memory/time to do this, so let's play safe.
raise_memory_limit(MEMORY_EXTRA);
core_php_time_limit::raise(300);
$parser = new core_cssparser($css);
$csstree = $parser->parse();
unset($parser);
if ($this->rtlmode) {
$this->rtlize($csstree);
}
if ($treeprocessor) {
$treeprocessor($csstree, $this);
}
$css = $csstree->render();
unset($csstree);
}
return $css;
}
/**
* Flip a stylesheet to RTL.
*
* @param Object $csstree The parsed CSS tree structure to flip.
* @return void
*/
protected function rtlize($csstree) {
$rtlcss = new core_rtlcss($csstree);
$rtlcss->flip();
}
/**
* Return the direct URL for an image from the pix folder.
*
* Use this function sparingly and never for icons. For icons use pix_icon or the pix helper in a mustache template.
*
* @deprecated since Moodle 3.3
* @param string $imagename the name of the icon.
* @param string $component specification of one plugin like in get_string()
* @return moodle_url
*/
public function pix_url($imagename, $component) {
debugging('pix_url is deprecated. Use image_url for images and pix_icon for icons.', DEBUG_DEVELOPER);
return $this->image_url($imagename, $component);
}
/**
* Return the direct URL for an image from the pix folder.
*
* Use this function sparingly and never for icons. For icons use pix_icon or the pix helper in a mustache template.
*
* @param string $imagename the name of the icon.
* @param string $component specification of one plugin like in get_string()
* @return moodle_url
*/
public function image_url($imagename, $component) {
global $CFG;
$params = array('theme'=>$this->name);
$svg = $this->use_svg_icons();
if (empty($component) or $component === 'moodle' or $component === 'core') {
$params['component'] = 'core';
} else {
$params['component'] = $component;
}
$rev = theme_get_revision();
if ($rev != -1) {
$params['rev'] = $rev;
}
$params['image'] = $imagename;
$url = new moodle_url("/theme/image.php");
if (!empty($CFG->slasharguments) and $rev > 0) {
$path = '/'.$params['theme'].'/'.$params['component'].'/'.$params['rev'].'/'.$params['image'];
if (!$svg) {
// We add a simple /_s to the start of the path.
// The underscore is used to ensure that it isn't a valid theme name.
$path = '/_s'.$path;
}
$url->set_slashargument($path, 'noparam', true);
} else {
if (!$svg) {
// We add an SVG param so that we know not to serve SVG images.
// We do this because all modern browsers support SVG and this param will one day be removed.
$params['svg'] = '0';
}
$url->params($params);
}
return $url;
}
/**
* Return the URL for a font
*
* @param string $font the name of the font (including extension).
* @param string $component specification of one plugin like in get_string()
* @return moodle_url
*/
public function font_url($font, $component) {
global $CFG;
$params = array('theme'=>$this->name);
if (empty($component) or $component === 'moodle' or $component === 'core') {
$params['component'] = 'core';
} else {
$params['component'] = $component;
}
$rev = theme_get_revision();
if ($rev != -1) {
$params['rev'] = $rev;
}
$params['font'] = $font;
$url = new moodle_url("/theme/font.php");
if (!empty($CFG->slasharguments) and $rev > 0) {
$path = '/'.$params['theme'].'/'.$params['component'].'/'.$params['rev'].'/'.$params['font'];
$url->set_slashargument($path, 'noparam', true);
} else {
$url->params($params);
}
return $url;
}
/**
* Returns URL to the stored file via pluginfile.php.
*
* Note the theme must also implement pluginfile.php handler,
* theme revision is used instead of the itemid.
*
* @param string $setting
* @param string $filearea
* @return string protocol relative URL or null if not present
*/
public function setting_file_url($setting, $filearea) {
global $CFG;
if (empty($this->settings->$setting)) {
return null;
}
$component = 'theme_'.$this->name;
$itemid = theme_get_revision();
$filepath = $this->settings->$setting;
$syscontext = context_system::instance();
$url = moodle_url::make_file_url("$CFG->wwwroot/pluginfile.php", "/$syscontext->id/$component/$filearea/$itemid".$filepath);
// Now this is tricky because the we can not hardcode http or https here, lets use the relative link.
// Note: unfortunately moodle_url does not support //urls yet.
$url = preg_replace('|^https?://|i', '//', $url->out(false));
return $url;
}
/**
* Serve the theme setting file.
*
* @param string $filearea
* @param array $args
* @param bool $forcedownload
* @param array $options
* @return bool may terminate if file not found or donotdie not specified
*/
public function setting_file_serve($filearea, $args, $forcedownload, $options) {
global $CFG;
require_once("$CFG->libdir/filelib.php");
$syscontext = context_system::instance();
$component = 'theme_'.$this->name;
$revision = array_shift($args);
if ($revision < 0) {
$lifetime = 0;
} else {
$lifetime = 60*60*24*60;
// By default, theme files must be cache-able by both browsers and proxies.
if (!array_key_exists('cacheability', $options)) {
$options['cacheability'] = 'public';
}
}
$fs = get_file_storage();
$relativepath = implode('/', $args);
$fullpath = "/{$syscontext->id}/{$component}/{$filearea}/0/{$relativepath}";
$fullpath = rtrim($fullpath, '/');
if ($file = $fs->get_file_by_hash(sha1($fullpath))) {
send_stored_file($file, $lifetime, 0, $forcedownload, $options);
return true;
} else {
send_file_not_found();
}
}
/**
* Resolves the real image location.
*
* $svg was introduced as an arg in 2.4. It is important because not all supported browsers support the use of SVG
* and we need a way in which to turn it off.
* By default SVG won't be used unless asked for. This is done for two reasons:
* 1. It ensures that we don't serve svg images unless we really want to. The admin has selected to force them, of the users
* browser supports SVG.
* 2. We only serve SVG images from locations we trust. This must NOT include any areas where the image may have been uploaded
* by the user due to security concerns.
*
* @param string $image name of image, may contain relative path
* @param string $component
* @param bool $svg|null Should SVG images also be looked for? If null, resorts to $CFG->svgicons if that is set; falls back to
* auto-detection of browser support otherwise
* @return string full file path
*/
public function resolve_image_location($image, $component, $svg = false) {
global $CFG;
if (!is_bool($svg)) {
// If $svg isn't a bool then we need to decide for ourselves.
$svg = $this->use_svg_icons();
}
if ($component === 'moodle' or $component === 'core' or empty($component)) {
if ($imagefile = $this->image_exists("$this->dir/pix_core/$image", $svg)) {
return $imagefile;
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // base first, the immediate parent last
if ($imagefile = $this->image_exists("$parent_config->dir/pix_core/$image", $svg)) {
return $imagefile;
}
}
if ($imagefile = $this->image_exists("$CFG->dataroot/pix/$image", $svg)) {
return $imagefile;
}
if ($imagefile = $this->image_exists("$CFG->dirroot/pix/$image", $svg)) {
return $imagefile;
}
return null;
} else if ($component === 'theme') { //exception
if ($image === 'favicon') {
return "$this->dir/pix/favicon.ico";
}
if ($imagefile = $this->image_exists("$this->dir/pix/$image", $svg)) {
return $imagefile;
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // base first, the immediate parent last
if ($imagefile = $this->image_exists("$parent_config->dir/pix/$image", $svg)) {
return $imagefile;
}
}
return null;
} else {
if (strpos($component, '_') === false) {
$component = 'mod_'.$component;
}
list($type, $plugin) = explode('_', $component, 2);
if ($imagefile = $this->image_exists("$this->dir/pix_plugins/$type/$plugin/$image", $svg)) {
return $imagefile;
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // base first, the immediate parent last
if ($imagefile = $this->image_exists("$parent_config->dir/pix_plugins/$type/$plugin/$image", $svg)) {
return $imagefile;
}
}
if ($imagefile = $this->image_exists("$CFG->dataroot/pix_plugins/$type/$plugin/$image", $svg)) {
return $imagefile;
}
$dir = core_component::get_plugin_directory($type, $plugin);
if ($imagefile = $this->image_exists("$dir/pix/$image", $svg)) {
return $imagefile;
}
return null;
}
}
/**
* Resolves the real font location.
*
* @param string $font name of font file
* @param string $component
* @return string full file path
*/
public function resolve_font_location($font, $component) {
global $CFG;
if ($component === 'moodle' or $component === 'core' or empty($component)) {
if (file_exists("$this->dir/fonts_core/$font")) {
return "$this->dir/fonts_core/$font";
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // Base first, the immediate parent last.
if (file_exists("$parent_config->dir/fonts_core/$font")) {
return "$parent_config->dir/fonts_core/$font";
}
}
if (file_exists("$CFG->dataroot/fonts/$font")) {
return "$CFG->dataroot/fonts/$font";
}
if (file_exists("$CFG->dirroot/lib/fonts/$font")) {
return "$CFG->dirroot/lib/fonts/$font";
}
return null;
} else if ($component === 'theme') { // Exception.
if (file_exists("$this->dir/fonts/$font")) {
return "$this->dir/fonts/$font";
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // Base first, the immediate parent last.
if (file_exists("$parent_config->dir/fonts/$font")) {
return "$parent_config->dir/fonts/$font";
}
}
return null;
} else {
if (strpos($component, '_') === false) {
$component = 'mod_'.$component;
}
list($type, $plugin) = explode('_', $component, 2);
if (file_exists("$this->dir/fonts_plugins/$type/$plugin/$font")) {
return "$this->dir/fonts_plugins/$type/$plugin/$font";
}
foreach (array_reverse($this->parent_configs) as $parent_config) { // Base first, the immediate parent last.
if (file_exists("$parent_config->dir/fonts_plugins/$type/$plugin/$font")) {
return "$parent_config->dir/fonts_plugins/$type/$plugin/$font";
}
}
if (file_exists("$CFG->dataroot/fonts_plugins/$type/$plugin/$font")) {
return "$CFG->dataroot/fonts_plugins/$type/$plugin/$font";
}
$dir = core_component::get_plugin_directory($type, $plugin);
if (file_exists("$dir/fonts/$font")) {
return "$dir/fonts/$font";
}
return null;
}
}
/**
* Return true if we should look for SVG images as well.
*
* @return bool
*/
public function use_svg_icons() {
global $CFG;
if ($this->usesvg === null) {
if (!isset($CFG->svgicons)) {
$this->usesvg = core_useragent::supports_svg();
} else {
// Force them on/off depending upon the setting.
$this->usesvg = (bool)$CFG->svgicons;
}
}
return $this->usesvg;
}
/**
* Forces the usesvg setting to either true or false, avoiding any decision making.
*
* This function should only ever be used when absolutely required, and before any generation of image URL's has occurred.
* DO NOT ABUSE THIS FUNCTION... not that you'd want to right ;)
*
* @param bool $setting True to force the use of svg when available, null otherwise.
*/
public function force_svg_use($setting) {
$this->usesvg = (bool)$setting;
}
/**
* Set to be in RTL mode.
*
* This will likely be used when post processing the CSS before serving it.
*
* @param bool $inrtl True when in RTL mode.
*/
public function set_rtl_mode($inrtl = true) {
$this->rtlmode = $inrtl;
}
/**
* Whether the theme is being served in RTL mode.
*
* @return bool True when in RTL mode.
*/
public function get_rtl_mode() {
return $this->rtlmode;
}
/**
* Checks if file with any image extension exists.
*
* The order to these images was adjusted prior to the release of 2.4
* At that point the were the following image counts in Moodle core:
*
* - png = 667 in pix dirs (1499 total)
* - gif = 385 in pix dirs (606 total)
* - jpg = 62 in pix dirs (74 total)
* - jpeg = 0 in pix dirs (1 total)
*
* There is work in progress to move towards SVG presently hence that has been prioritiesed.
*
* @param string $filepath
* @param bool $svg If set to true SVG images will also be looked for.
* @return string image name with extension
*/
private static function image_exists($filepath, $svg = false) {
if ($svg && file_exists("$filepath.svg")) {
return "$filepath.svg";
} else if (file_exists("$filepath.png")) {
return "$filepath.png";
} else if (file_exists("$filepath.gif")) {
return "$filepath.gif";
} else if (file_exists("$filepath.jpg")) {
return "$filepath.jpg";
} else if (file_exists("$filepath.jpeg")) {
return "$filepath.jpeg";
} else {
return false;
}
}
/**
* Loads the theme config from config.php file.
*
* @param string $themename
* @param stdClass $settings from config_plugins table
* @param boolean $parentscheck true to also check the parents. .
* @return stdClass The theme configuration
*/
private static function find_theme_config($themename, $settings, $parentscheck = true) {
// We have to use the variable name $THEME (upper case) because that
// is what is used in theme config.php files.
if (!$dir = theme_config::find_theme_location($themename)) {
return null;
}
$THEME = new stdClass();
$THEME->name = $themename;
$THEME->dir = $dir;
$THEME->settings = $settings;
global $CFG; // just in case somebody tries to use $CFG in theme config
include("$THEME->dir/config.php");
// verify the theme configuration is OK
if (!is_array($THEME->parents)) {
// parents option is mandatory now
return null;
} else {
// We use $parentscheck to only check the direct parents (avoid infinite loop).
if ($parentscheck) {
// Find all parent theme configs.
foreach ($THEME->parents as $parent) {
$parentconfig = theme_config::find_theme_config($parent, $settings, false);
if (empty($parentconfig)) {
return null;
}
}
}
}
return $THEME;
}
/**
* Finds the theme location and verifies the theme has all needed files
* and is not obsoleted.
*
* @param string $themename
* @return string full dir path or null if not found
*/
private static function find_theme_location($themename) {
global $CFG;
if (file_exists("$CFG->dirroot/theme/$themename/config.php")) {
$dir = "$CFG->dirroot/theme/$themename";
} else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/$themename/config.php")) {
$dir = "$CFG->themedir/$themename";
} else {
return null;
}
if (file_exists("$dir/styles.php")) {
//legacy theme - needs to be upgraded - upgrade info is displayed on the admin settings page
return null;
}
return $dir;
}
/**
* Get the renderer for a part of Moodle for this theme.
*
* @param moodle_page $page the page we are rendering
* @param string $component the name of part of moodle. E.g. 'core', 'quiz', 'qtype_multichoice'.
* @param string $subtype optional subtype such as 'news' resulting to 'mod_forum_news'
* @param string $target one of rendering target constants
* @return renderer_base the requested renderer.
*/
public function get_renderer(moodle_page $page, $component, $subtype = null, $target = null) {
if (is_null($this->rf)) {
$classname = $this->rendererfactory;
$this->rf = new $classname($this);
}
return $this->rf->get_renderer($page, $component, $subtype, $target);
}
/**
* Get the information from {@link $layouts} for this type of page.
*
* @param string $pagelayout the the page layout name.
* @return array the appropriate part of {@link $layouts}.
*/
protected function layout_info_for_page($pagelayout) {
if (array_key_exists($pagelayout, $this->layouts)) {
return $this->layouts[$pagelayout];
} else {
debugging('Invalid page layout specified: ' . $pagelayout);
return $this->layouts['standard'];
}
}
/**
* Given the settings of this theme, and the page pagelayout, return the
* full path of the page layout file to use.
*
* Used by {@link core_renderer::header()}.
*
* @param string $pagelayout the the page layout name.
* @return string Full path to the lyout file to use
*/
public function layout_file($pagelayout) {
global $CFG;
$layoutinfo = $this->layout_info_for_page($pagelayout);
$layoutfile = $layoutinfo['file'];
if (array_key_exists('theme', $layoutinfo)) {
$themes = array($layoutinfo['theme']);
} else {
$themes = array_merge(array($this->name),$this->parents);
}
foreach ($themes as $theme) {
if ($dir = $this->find_theme_location($theme)) {
$path = "$dir/layout/$layoutfile";
// Check the template exists, return general base theme template if not.
if (is_readable($path)) {
return $path;
}
}
}
debugging('Can not find layout file for: ' . $pagelayout);
// fallback to standard normal layout
return "$CFG->dirroot/theme/base/layout/general.php";
}
/**
* Returns auxiliary page layout options specified in layout configuration array.
*
* @param string $pagelayout
* @return array
*/
public function pagelayout_options($pagelayout) {
$info = $this->layout_info_for_page($pagelayout);
if (!empty($info['options'])) {
return $info['options'];
}
return array();
}
/**
* Inform a block_manager about the block regions this theme wants on this
* page layout.
*
* @param string $pagelayout the general type of the page.
* @param block_manager $blockmanager the block_manger to set up.
*/
public function setup_blocks($pagelayout, $blockmanager) {
$layoutinfo = $this->layout_info_for_page($pagelayout);
if (!empty($layoutinfo['regions'])) {
$blockmanager->add_regions($layoutinfo['regions'], false);
$blockmanager->set_default_region($layoutinfo['defaultregion']);
}
}
/**
* Gets the visible name for the requested block region.
*
* @param string $region The region name to get
* @param string $theme The theme the region belongs to (may come from the parent theme)
* @return string
*/
protected function get_region_name($region, $theme) {
$regionstring = get_string('region-' . $region, 'theme_' . $theme);
// A name exists in this theme, so use it
if (substr($regionstring, 0, 1) != '[') {
return $regionstring;
}
// Otherwise, try to find one elsewhere
// Check parents, if any
foreach ($this->parents as $parentthemename) {
$regionstring = get_string('region-' . $region, 'theme_' . $parentthemename);
if (substr($regionstring, 0, 1) != '[') {
return $regionstring;
}
}
// Last resort, try the boost theme for names
return get_string('region-' . $region, 'theme_boost');
}
/**
* Get the list of all block regions known to this theme in all templates.
*
* @return array internal region name => human readable name.
*/
public function get_all_block_regions() {
$regions = array();
foreach ($this->layouts as $layoutinfo) {
foreach ($layoutinfo['regions'] as $region) {
$regions[$region] = $this->get_region_name($region, $this->name);
}
}
return $regions;
}
/**
* Returns the human readable name of the theme
*
* @return string
*/
public function get_theme_name() {
return get_string('pluginname', 'theme_'.$this->name);
}
/**
* Returns the block render method.
*
* It is set by the theme via:
* $THEME->blockrendermethod = '...';
*
* It can be one of two values, blocks or blocks_for_region.
* It should be set to the method being used by the theme layouts.
*
* @return string
*/
public function get_block_render_method() {
if ($this->blockrendermethod) {
// Return the specified block render method.
return $this->blockrendermethod;
}
// Its not explicitly set, check the parent theme configs.
foreach ($this->parent_configs as $config) {
if (isset($config->blockrendermethod)) {
return $config->blockrendermethod;
}
}
// Default it to blocks.
return 'blocks';
}
/**
* Get the callable for CSS tree post processing.
*
* @return string|null
*/
public function get_css_tree_post_processor() {
$configs = [$this] + $this->parent_configs;
foreach ($configs as $config) {
if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
return $config->csstreepostprocessor;
}
}
return null;
}
}
/**
* This class keeps track of which HTML tags are currently open.
*
* This makes it much easier to always generate well formed XHTML output, even
* if execution terminates abruptly. Any time you output some opening HTML
* without the matching closing HTML, you should push the necessary close tags
* onto the stack.
*
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
* @package core
* @category output
*/
class xhtml_container_stack {
/**
* @var array Stores the list of open containers.
*/
protected $opencontainers = array();
/**
* @var array In developer debug mode, stores a stack trace of all opens and
* closes, so we can output helpful error messages when there is a mismatch.
*/
protected $log = array();
/**
* @var boolean Store whether we are developer debug mode. We need this in
* several places including in the destructor where we may not have access to $CFG.
*/
protected $isdebugging;
/**
* Constructor
*/
public function __construct() {
global $CFG;
$this->isdebugging = $CFG->debugdeveloper;
}
/**
* Push the close HTML for a recently opened container onto the stack.
*
* @param string $type The type of container. This is checked when {@link pop()}
* is called and must match, otherwise a developer debug warning is output.
* @param string $closehtml The HTML required to close the container.
*/
public function push($type, $closehtml) {
$container = new stdClass;
$container->type = $type;
$container->closehtml = $closehtml;
if ($this->isdebugging) {
$this->log('Open', $type);
}
array_push($this->opencontainers, $container);
}
/**
* Pop the HTML for the next closing container from the stack. The $type
* must match the type passed when the container was opened, otherwise a
* warning will be output.
*
* @param string $type The type of container.
* @return string the HTML required to close the container.
*/
public function pop($type) {
if (empty($this->opencontainers)) {
debugging('<p>There are no more open containers. This suggests there is a nesting problem.</p>' .
$this->output_log(), DEBUG_DEVELOPER);
return;
}
$container = array_pop($this->opencontainers);
if ($container->type != $type) {
debugging('<p>The type of container to be closed (' . $container->type .
') does not match the type of the next open container (' . $type .
'). This suggests there is a nesting problem.</p>' .
$this->output_log(), DEBUG_DEVELOPER);
}
if ($this->isdebugging) {
$this->log('Close', $type);
}
return $container->closehtml;
}
/**
* Close all but the last open container. This is useful in places like error
* handling, where you want to close all the open containers (apart from <body>)
* before outputting the error message.
*
* @param bool $shouldbenone assert that the stack should be empty now - causes a
* developer debug warning if it isn't.
* @return string the HTML required to close any open containers inside <body>.
*/
public function pop_all_but_last($shouldbenone = false) {
if ($shouldbenone && count($this->opencontainers) != 1) {
debugging('<p>Some HTML tags were opened in the body of the page but not closed.</p>' .
$this->output_log(), DEBUG_DEVELOPER);
}
$output = '';
while (count($this->opencontainers) > 1) {
$container = array_pop($this->opencontainers);
$output .= $container->closehtml;
}
return $output;
}
/**
* You can call this function if you want to throw away an instance of this
* class without properly emptying the stack (for example, in a unit test).
* Calling this method stops the destruct method from outputting a developer
* debug warning. After calling this method, the instance can no longer be used.
*/
public function discard() {
$this->opencontainers = null;
}
/**
* Adds an entry to the log.
*
* @param string $action The name of the action
* @param string $type The type of action
*/
protected function log($action, $type) {
$this->log[] = '<li>' . $action . ' ' . $type . ' at:' .
format_backtrace(debug_backtrace()) . '</li>';
}
/**
* Outputs the log's contents as a HTML list.
*
* @return string HTML list of the log
*/
protected function output_log() {
return '<ul>' . implode("\n", $this->log) . '</ul>';
}
}