C:/xampp/htdocs/moodle/lib/outputlib.php

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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/>.

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');

function theme_reset_all_caches() {
    global $CFG;
    require_once("$CFG->libdir/filelib.php");

    set_config('themerev', empty($CFG->themerev) ? 1 : $CFG->themerev+1);
    fulldelete("$CFG->cachedir/theme");
}

function theme_set_designer_mod($state) {
    theme_reset_all_caches();
    set_config('themedesignermode', (int)!empty($state));
}

function theme_get_revision() {
    global $CFG;

    if (empty($CFG->themedesignermode)) {
        if (empty($CFG->themerev)) {
            return -1;
        } else {
            return $CFG->themerev;
        }

    } else {
        return -1;
    }
}


class theme_config {
    const DEFAULT_THEME = 'standard';

    public $parents;

    public $sheets = array();

    public $parents_exclude_sheets = null;

    public $plugins_exclude_sheets = null;

    public $editor_sheets = array();

    public $javascripts = array();

    public $javascripts_footer = array();

    public $parents_exclude_javascripts = null;

    public $layouts = array();

    public $rendererfactory = 'standard_renderer_factory';

    public $csspostprocess = null;

    public $rarrow = null;

    public $larrow = null;

    public $enablecourseajax = true;

    //==Following properties are not configurable from theme config.php==

    public $name;

    public $dir;

    public $setting = null;

    public $enable_dock = false;

    public $hidefromselector = false;

    protected $rf = null;

    protected $parent_configs = array();

    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 {
            // bad luck, the requested theme has some problems - admin see details in theme config
            return new theme_config(theme_config::find_theme_config(theme_config::DEFAULT_THEME, $settings));
        }
    }

    public static function diagnose($themename) {
        //TODO: MDL-21108
        return array();
    }

    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 != 'base') {
            $baseconfig = theme_config::find_theme_config('base', $this->settings);
        } else {
            $baseconfig = $config;
        }

        $configurable = array('parents', 'sheets', 'parents_exclude_sheets', 'plugins_exclude_sheets', 'javascripts', 'javascripts_footer',
                              'parents_exclude_javascripts', 'layouts', 'enable_dock', 'enablecourseajax',
                              'rendererfactory', 'csspostprocess', 'editor_sheets', 'rarrow', 'larrow', 'hidefromselector');

        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 == 'base') {
                $parent_config = $baseconfig;
            } else if (!$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;
            $rendererfile = $parent_config->dir.'/renderers.php';
            if (is_readable($rendererfile)) {
                 // may contain core and plugin renderers and renderer factory
                include_once($rendererfile);
            }
        }
        $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);
        }

        // 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();
    }

    /*
     * Checks if arrows $THEME->rarrow, $THEME->larrow have been set (theme/-/config.php).
     * If not it applies sensible defaults.
     *
     * Accessibility: right and left arrow Unicode characters for breadcrumb, calendar,
     * search forum block, etc. Important: these are 'silent' in a screen-reader
     * (unlike &gt; &raquo;), and must be accompanied by text.
     */
    private function check_theme_arrows() {
        if (!isset($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 = '&#x25BA;';
            $this->larrow = '&#x25C4;';
            if (empty($_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 = '&#x25B6;';
                $this->larrow = '&#x25C0;';
            }
            elseif (false !== strpos($uagent, 'Konqueror')) {
                $this->rarrow = '&rarr;';
                $this->larrow = '&larr;';
            }
            elseif (isset($_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 = '&gt;';
                $this->larrow = '&lt;';
            }

            if (right_to_left()) {
                $t = $this->rarrow;
                $this->rarrow = $this->larrow;
                $this->larrow = $t;
            }
        }
    }

    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;
    }

    public function editor_css_url($encoded=true) {
        global $CFG;

        $rev = theme_get_revision();

        if ($rev > -1) {
            $params = array('theme'=>$this->name,'rev'=>$rev, 'type'=>'editor');
            return new moodle_url($CFG->httpswwwroot.'/theme/styles.php', $params);
        } else {
            $params = array('theme'=>$this->name, 'type'=>'editor');
            return new moodle_url($CFG->httpswwwroot.'/theme/styles_debug.php', $params);
        }
    }

    public function editor_css_files() {
        global $CFG;

        $files = array();

        // first editor plugins
        $plugins = get_plugin_list('editor');
        foreach ($plugins as $plugin=>$fulldir) {
            $sheetfile = "$fulldir/editor_styles.css";
            if (is_readable($sheetfile)) {
                $files['plugin_'.$plugin] = $sheetfile;
            }
        }
        // then parent themes
        foreach (array_reverse($this->parent_configs) as $parent_config) { // base first, the immediate parent last
            if (empty($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;
    }

    public function css_urls(moodle_page $page) {
        global $CFG;

        $rev = theme_get_revision();

        $urls = array();

        if ($rev > -1) {
            if (check_browser_version('MSIE', 5)) {
                // We need to split the CSS files for IE
                $urls[] = new moodle_url($CFG->httpswwwroot.'/theme/styles.php', array('theme'=>$this->name,'rev'=>$rev, 'type'=>'plugins'));
                $urls[] = new moodle_url($CFG->httpswwwroot.'/theme/styles.php', array('theme'=>$this->name,'rev'=>$rev, 'type'=>'parents'));
                $urls[] = new moodle_url($CFG->httpswwwroot.'/theme/styles.php', array('theme'=>$this->name,'rev'=>$rev, 'type'=>'theme'));
            } else {
                $urls[] = new moodle_url($CFG->httpswwwroot.'/theme/styles.php', array('theme'=>$this->name,'rev'=>$rev));
            }
        } else {
            // find out the current CSS and cache it now for 5 seconds
            // the point is to construct the CSS only once and pass it through the
            // dataroot to the script that actually serves the sheets
            if (!defined('THEME_DESIGNER_CACHE_LIFETIME')) {
                define('THEME_DESIGNER_CACHE_LIFETIME', 4); // this can be also set in config.php
            }
            $candidatesheet = "$CFG->cachedir/theme/$this->name/designer.ser";
            if (!file_exists($candidatesheet)) {
                $css = $this->css_content();
                check_dir_exists(dirname($candidatesheet));
                file_put_contents($candidatesheet, serialize($css));

            } else if (filemtime($candidatesheet) > time() - THEME_DESIGNER_CACHE_LIFETIME) {
                if ($css = file_get_contents($candidatesheet)) {
                    $css = unserialize($css);
                } else {
                    unlink($candidatesheet);
                    $css = $this->css_content();
                }

            } else {
                unlink($candidatesheet);
                $css = $this->css_content();
                file_put_contents($candidatesheet, serialize($css));
            }

            $baseurl = $CFG->httpswwwroot.'/theme/styles_debug.php';

            if (check_browser_version('MSIE', 5)) {
                // 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));
                }
                $urls[] = new moodle_url($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 $sheet=>$unused) {
                    $urls[] = new moodle_url($baseurl, array('sheet'=>$sheet, 'theme'=>$this->name, 'type'=>'theme')); // sheet first in order to make long urls easier to read
                }
            }
        }

        return $urls;
    }

    public function css_files() {
        $cssfiles = array('plugins'=>array(), 'parents'=>array(), 'theme'=>array());

        // get all plugin sheets
        $excludes = $this->resolve_excludes('plugins_exclude_sheets');
        if ($excludes !== true) {
            foreach (get_plugin_types() as $type=>$unused) {
                if ($type === 'theme' || (!empty($excludes[$type]) and $excludes[$type] === true)) {
                    continue;
                }
                $plugins = get_plugin_list($type);
                foreach ($plugins as $plugin=>$fulldir) {
                    if (!empty($excludes[$type]) and is_array($excludes[$type])
                        and in_array($plugin, $excludes[$type])) {
                        continue;
                    }

                    $plugincontent = '';
                    $sheetfile = "$fulldir/styles.css";
                    if (is_readable($sheetfile)) {
                        $cssfiles['plugins'][$type.'_'.$plugin] = $sheetfile;
                    }
                    $sheetthemefile = "$fulldir/styles_{$this->name}.css";
                    if (is_readable($sheetthemefile)) {
                        $cssfiles['plugins'][$type.'_'.$plugin.'_'.$this->name] = $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[$parent]) and is_array($excludes[$parent])
                        and in_array($sheet, $excludes[$parent])) {
                        continue;
                    }
                    $sheetfile = "$parent_config->dir/style/$sheet.css";
                    if (is_readable($sheetfile)) {
                        $cssfiles['parents'][$parent][$sheet] = $sheetfile;
                    }
                }
            }
        }

        // current theme sheets
        if (is_array($this->sheets)) {
            foreach ($this->sheets as $sheet) {
                $sheetfile = "$this->dir/style/$sheet.css";
                if (is_readable($sheetfile)) {
                    $cssfiles['theme'][$sheet] = $sheetfile;
                }
            }
        }

        return $cssfiles;
    }

    public function css_content() {
        $files = array_merge($this->css_files(), array('editor'=>$this->editor_css_files()));
        $css = $this->css_files_get_contents($files, array());
        return $css;
    }

    protected function css_files_get_contents($file, array $keys) {
        if (is_array($file)) {
            foreach ($file as $key=>$f) {
                $file[$key] = $this->css_files_get_contents($f, array_merge($keys, array($key)));
            }
            return $file;
        } else {
            $comment = '/** Path: '.implode(' ', $keys).' **/'."\n";
            return $comment.$this->post_process(file_get_contents($file));
        }
    }


    public function javascript_url($inhead) {
        global $CFG;

        $rev = theme_get_revision();
        $params = array('theme'=>$this->name,'rev'=>$rev);
        $params['type'] = $inhead ? 'head' : 'footer';

        return new moodle_url($CFG->httpswwwroot.'/theme/javascript.php', $params);
    }

    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;
    }

    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;
    }

    public function javascript_content($type) {
        $jsfiles = $this->javascript_files($type);
        $js = '';
        foreach ($jsfiles as $jsfile) {
            $js .= file_get_contents($jsfile)."\n";
        }
        return $js;
    }

    public function post_process($css) {
        global $CFG;

        // now resolve all image locations
        if (preg_match_all('/\[\[pix:([a-z_]+\|)?([^\]]+)\]\]/', $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 = $this->pix_url($imagename, $component)->out(false);
                 // we do not need full url because the image.php is always in the same dir
                $imageurl = str_replace("$CFG->httpswwwroot/theme/", '', $imageurl);
                $css = str_replace($match[0], $imageurl, $css);
            }
        }

        // now resolve all theme settings or do any other postprocessing
        $csspostprocess = $this->csspostprocess;
        if (function_exists($csspostprocess)) {
            $css = $csspostprocess($css, $this);
        }

        return $css;
    }

    public function pix_url($imagename, $component) {
        global $CFG;

        $params = array('theme'=>$this->name, 'image'=>$imagename);

        $rev = theme_get_revision();
        if ($rev != -1) {
            $params['rev'] = $rev;
        }
        if (!empty($component) and $component !== 'moodle'and $component !== 'core') {
            $params['component'] = $component;
        }

        return new moodle_url("$CFG->httpswwwroot/theme/image.php", $params);
    }

    public function resolve_image_location($image, $component) {
        global $CFG;

        if ($component === 'moodle' or $component === 'core' or empty($component)) {
            if ($imagefile = $this->image_exists("$this->dir/pix_core/$image")) {
                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")) {
                    return $imagefile;
                }
            }
            if ($imagefile = $this->image_exists("$CFG->dirroot/pix/$image")) {
                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")) {
                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")) {
                    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")) {
                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")) {
                    return $imagefile;
                }
            }
            $dir = get_plugin_directory($type, $plugin);
            if ($imagefile = $this->image_exists("$dir/pix/$image")) {
                return $imagefile;
            }
            return null;
        }
    }

    private static function image_exists($filepath) {
        if (file_exists("$filepath.gif")) {
            return "$filepath.gif";
        } else  if (file_exists("$filepath.png")) {
            return "$filepath.png";
        } else  if (file_exists("$filepath.jpg")) {
            return "$filepath.jpg";
        } else  if (file_exists("$filepath.jpeg")) {
            return "$filepath.jpeg";
        } else {
            return false;
        }
    }

    private static function find_theme_config($themename, $settings) {
        // 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;
        }

        return $THEME;
    }

    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;
    }

    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);
    }

    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'];
        }
    }

    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";
    }

    public function pagelayout_options($pagelayout) {
        $info = $this->layout_info_for_page($pagelayout);
        if (!empty($info['options'])) {
            return $info['options'];
        }
        return array();
    }

    public function setup_blocks($pagelayout, $blockmanager) {
        $layoutinfo = $this->layout_info_for_page($pagelayout);
        if (!empty($layoutinfo['regions'])) {
            $blockmanager->add_regions($layoutinfo['regions']);
            $blockmanager->set_default_region($layoutinfo['defaultregion']);
        }
    }

    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 base theme for names
        return get_string('region-' . $region, 'theme_base');
    }

    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;
    }

    public function get_theme_name() {
        return get_string('pluginname', 'theme_'.$this->name);
    }
}


class xhtml_container_stack {
    protected $opencontainers = array();
    protected $log = array();
    protected $isdebugging;

    public function __construct() {
        $this->isdebugging = debugging('', DEBUG_DEVELOPER);
    }

    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);
    }

    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;
    }

    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;
    }

    public function discard() {
        $this->opencontainers = null;
    }

    protected function log($action, $type) {
        $this->log[] = '<li>' . $action . ' ' . $type . ' at:' .
                format_backtrace(debug_backtrace()) . '</li>';
    }

    protected function output_log() {
        return '<ul>' . implode("\n", $this->log) . '</ul>';
    }
}