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<?php
//  ------------------------------------------------------------------------ //
//                XOOPS - PHP Content Management System                      //
//                    Copyright (c) 2000 XOOPS.org                           //
//                       <http://www.xoops.org/>                             //
//  ------------------------------------------------------------------------ //
//  This program 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 2 of the License, or        //
//  (at your option) any later version.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  This program 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 this program; if not, write to the Free Software              //
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
//  ------------------------------------------------------------------------ //
// Author: Kazumi Ono (AKA onokazu)                                          //
// URL: http://www.myweb.ne.jp/, http://www.xoops.org/, http://jp.xoops.org/ //
// Project: The XOOPS Project                                                //
// ------------------------------------------------------------------------- //
/**
 * icms_view_theme_Object component class file
 *
 * @license      http://www.fsf.org/copyleft/gpl.html GNU public license
 * @version     $Id: Object.php 12313 2013-09-15 21:14:35Z skenow $
 * @category    ICMS
 * @package     View
 * @subpackage  Theme
 */
/**
 *
 * Builds the theme components
 * @author       Skalpa Keo <skalpa@xoops.org>
 * @copyright   Copyright (c) 2000 XOOPS.org
 * @category    ICMS
 * @package     View
 * @subpackage  Theme
 */
class icms_view_theme_Object {
    /**
     * The name of this theme
     * @public string
     */
    public $folderName = '';
    /**
     * Physical path of this theme folder
     * @public string
     */
    public $path = '';
    public $url = '';

    /**
     * Whether or not the theme engine should include the output generated by php
     * @public string
     */
    public $bufferOutput = TRUE;
    /**
     * Canvas-level template to use
     * @public string
     */
    public $canvasTemplate = 'theme.html';
    /**
     * Content-level template to use
     * @public string
     */
    public $contentTemplate = '';

    public $contentCacheLifetime = 0;
    public $contentCacheId = NULL;

    /**
     * Text content to display right after the contentTemplate output
     * @public string
     */
    public $content = '';
    /**
     * Page construction plug-ins to use
     * @public array
     */
    public $plugins = array('icms_view_PageBuilder');

    public $renderCount = 0;
    /**
     * Pointer to the theme template engine
     * @public icms_view_Tpl
     */
    public $template = FALSE;

    /**
     * Array containing the document meta-information
     */
    public $metas = array(
        'head' => array(),
        'module' => array(),
        'foot' => array(),
    );
    /**
     * Array of meta types - their order in the array determines their rendering sequence
     */
    public $types = array('http', 'meta', 'link', 'stylesheet', 'script', 'property', 'itemprop');

    /**
     * Array of strings to be inserted in the head tag of HTML documents
     * @public array
     */
    public $htmlHeadStrings = array();
    /**
     * Custom publiciables that will always be assigned to the template
     * @public array
     */
    public $templateVars = array();

    /**
     * User extra information for cache id, like language, user groups
     *
     * @public boolean
     */
    public $use_extra_cache_id = TRUE;

    /**#@-*/

    /**#@+ @tasktype 10 Initialization*/
    /**
     * Initializes this theme
     *
     * Upon initialization, the theme creates its template engine and instanciates the
     * plug-ins from the specified {@link $plugins} list. If the theme is a 2.0 theme, that does not
     * display redirection messages, the HTTP redirections system is disabled to ensure users will
     * see the redirection screen.
     *
     * @param array $options
     * @return bool
     */
    public function xoInit($options = array()) {
        global $xoops;

        $this->path = (is_dir(ICMS_MODULES_PATH . '/system/themes/' . $this->folderName))
            ? ICMS_MODULES_PATH . '/system/themes/' . $this->folderName
            : ICMS_THEME_PATH . '/' . $this->folderName;
        $this->url = (is_dir(ICMS_MODULES_PATH . '/system/themes/' . $this->folderName))
            ? ICMS_MODULES_URL . '/system/themes/' . $this->folderName
            : ICMS_THEME_URL . '/' . $this->folderName;

        $this->template = new icms_view_Tpl();
        $this->template->currentTheme =& $this;
        $this->template->assign_by_ref('xoTheme', $this);

        global $icmsConfig, $icmsConfigMetaFooter, $icmsModule, $xoopsModule;
        $this->template->assign(
            array(
                'icms_style' => ICMS_URL . '/icms' . ((defined('_ADM_USE_RTL') && _ADM_USE_RTL) ? '_rtl' : '') . '.css',
                'icms_theme' => $this->folderName,
                'icms_imageurl' => (is_dir(ICMS_MODULES_PATH . '/system/themes/' . $this->folderName . '/'))
                    ? ICMS_MODULES_URL . '/system/themes/' . $this->folderName . '/'
                    : ICMS_THEME_URL . '/' . $this->folderName . '/',
                'icms_themecss'=> xoops_getcss($this->folderName),
                'icms_requesturi' => htmlspecialchars($_SERVER['REQUEST_URI'], ENT_QUOTES),
                'icms_sitename' => htmlspecialchars($icmsConfig['sitename'], ENT_QUOTES),
                'icms_slogan' => htmlspecialchars($icmsConfig['slogan'], ENT_QUOTES),
                'icms_dirname' => @$icmsModule ? $icmsModule->getVar('dirname') : 'system',
                'icms_pagetitle' => isset($icmsModule) && is_object($icmsModule)
                        ? $icmsModule->getVar('name')
                        : htmlspecialchars($icmsConfig['slogan'], ENT_QUOTES)
            )
        );

        // this is for backward compatibility only!
        $this->template->assign(array(
            'xoops_theme' => $this->template->get_template_vars('icms_theme'),
            'xoops_imageurl' => $this->template->get_template_vars('icms_imageurl'),
            'xoops_themecss' => $this->template->get_template_vars('icms_themecss'),
            'xoops_requesturi' => $this->template->get_template_vars('icms_requesturi'),
            'xoops_sitename' => $this->template->get_template_vars('icms_sitename'),
            'xoops_slogan' => $this->template->get_template_vars('icms_slogan'),
            'xoops_dirname' => $this->template->get_template_vars('icms_dirname'),
        ));
        if (isset(icms::$user) && is_object(icms::$user)) {
            $this->template->assign(array(
                'icms_isuser' => TRUE,
                'icms_userid' => icms::$user->getVar('uid'),
                'icms_uname' => icms::$user->getVar('uname'),
                'icms_isadmin' => icms::$user->isAdmin(),
                'xoops_isuser' => TRUE,
                'xoops_userid' => icms::$user->getVar('uid'),
                'xoops_uname' => icms::$user->getVar('uname'),
                'xoops_isadmin' => icms::$user->isAdmin(),
                )
            );
        } else {
            $this->template->assign(
                array('icms_isuser' => FALSE,
                    'icms_isadmin' => FALSE,
                    'xoops_isuser' => FALSE,
                    'xoops_isadmin' => FALSE
                )
            );
        }
        // Meta tags
        foreach ($icmsConfigMetaFooter as $name => $value) {
            if (substr($name, 0, 5) == 'meta_') {
                $this->addMeta('meta', substr($name, 5), $value);
            } elseif (substr($name, 0, 6) == 'footer') {
                $values = $value;
                $this->template->assign("xoops_$name", $values);
                $this->template->assign("icms_$name", $values);
            } else {
                // prefix each tag with 'xoops_'
                $this->template->assign("xoops_$name", $value);
                $this->template->assign("icms_$name", $value);
            }
        }

        if ($this->bufferOutput) {
            ob_start();
        }
        $GLOBALS['xoTheme'] =& $this;
        $GLOBALS['xoopsTpl'] =& $this->template;
        // Instanciate and initialize all the theme plugins
        foreach ($this->plugins as $k => $bundleId) {
            if (!is_object($bundleId)) {
                $this->plugins[$bundleId] = new $bundleId();
                $this->plugins[$bundleId]->theme =& $this;
                $this->plugins[$bundleId]->xoInit();
                unset($this->plugins[$k]);
            }
        }
        return TRUE;
    }
    /**#@-*/

    /**
     * Generate cache id based on extra information of language and user groups
     *
     * User groups other than anonymous should be detected to avoid disclosing group sensitive contents
     *
     * @param string    $cache_id       raw cache id
     * @param string    $extraString    extra string
     *
     * @return string   complete cache id
     */
    public function generateCacheId($cache_id, $extraString = '') {
        static $extra_string;

        if (!$this->use_extra_cache_id) {
            return $cache_id;
        }

        if (empty($extraString)) {
            if (empty($extra_string)) {
                global $icmsConfig;

                // Generate language section
                $extra_string = $icmsConfig['language'];

                // Generate group section
                if (!@is_object(icms::$user)) {
                    $extra_string .= '|' . ICMS_GROUP_ANONYMOUS;
                } else {
                    $groups = icms::$user->getGroups();
                    sort($groups);
                    // Generate group string for non-anonymous groups,
                    // XOOPS_DB_PASS and XOOPS_DB_NAME (before we find better variables) are used to protect group sensitive contents
                    $extra_string .= '|' . implode(",", $groups)
                        . substr(md5(XOOPS_DB_PASS . XOOPS_DB_NAME), 0, strlen(XOOPS_DB_USER) * 2);
                }
            }
            $extraString = $extra_string;
        }
        $cache_id .= '|' . $extraString;

        return $cache_id;
    }

    /**
     * Checks cache for a changed version of the template and renders template
     * @return  bool
     */
    public function checkCache() {
        global $xoopsModule, $icmsModule;

        if ($_SERVER['REQUEST_METHOD'] != 'POST' && $this->contentCacheLifetime) {
            $template = $this->contentTemplate ? $this->contentTemplate : 'db:system_dummy.html';
            $dirname = $icmsModule->getVar('dirname', 'n');

            $this->template->caching = 2;
            $this->template->cache_lifetime = $this->contentCacheLifetime;
            $uri = str_replace(ICMS_URL, '', $_SERVER['REQUEST_URI']);
            // Clean uri by removing session id
            if (defined('SID') && SID && strpos($uri, SID)) {
                $uri = preg_replace("/([\?&])(" . SID . "$|" . SID . "&)/", "\\1", $uri);
            }
            $this->contentCacheId = $this->generateCacheId($dirname . '|' . $uri);

            if ($this->template->is_cached($template, $this->contentCacheId)) {
                icms::$logger->addExtra($template, sprintf(_REGENERATES, $this->contentCacheLifetime));
                $this->render(NULL, NULL, $template);
                return TRUE;
            }
        }
        return FALSE;
    }

    /**
     * Render the page
     *
     * The theme engine builds pages from 2 templates: canvas and content.
     *
     * A module can call this method directly and specify what templates the theme engine must use.
     * If render() hasn't been called before, the theme defaults will be used for the canvas and
     * page template (and xoopsOption['template_main'] for the content).
     *
     * @param string $canvasTpl     The canvas template, if different from the theme default
     * @param string $pageTpl       The page template, if different from the theme default (unsupported, 2.3+ only)
     * @param string $contentTpl    The content template
     * @param array  $vars          Template variables to send to the template engine
     */
    public function render($canvasTpl = NULL, $pageTpl = NULL, $contentTpl = NULL, $vars = array()) {
        global $xoops, $xoopsOption;

        if ($this->renderCount) {
            return FALSE;
        }
        icms::$logger->startTime('Page rendering');

        // @internal: Lame fix to ensure the metas specified in the xoops config page don't appear twice
        $old = array('robots', 'keywords', 'description', 'rating', 'author', 'copyright');
        foreach ($this->metas['module']['meta'] as $name => $value) {
            if (in_array($name, $old)) {
                $this->template->assign("xoops_meta_$name", htmlspecialchars($value['value'], ENT_QUOTES));
                $this->template->assign("icms_meta_$name", htmlspecialchars($value['value'], ENT_QUOTES));
                unset($this->metas['module']['meta'][$name]);
            }
        }

        if ($canvasTpl) $this->canvasTemplate   = $canvasTpl;
        if ($contentTpl) $this->contentTemplate = $contentTpl;

        if (!empty($vars)) {
            $this->template->assign($vars);
        }
        if ($this->contentTemplate) {
            $this->content = $this->template->fetch($this->contentTemplate, $this->contentCacheId);
        }
        if ($this->bufferOutput) {
            $this->content .= ob_get_contents();
            ob_end_clean();
        }
        $this->template->assign_by_ref('xoops_contents', $this->content);
        $this->template->assign_by_ref('icms_contents', $this->content);

        $header = empty($xoopsOption['icms_module_header'])
            ? $this->template->get_template_vars('icms_module_header')
            : $xoopsOption['icms_module_header'];
        /** @todo   Remove xoops_module_header in 2.0 */
        $xheader = empty($xoopsOption['xoops_module_header'])
            ? $this->template->get_template_vars('xoops_module_header')
            : $xoopsOption['xoops_module_header'];
        if ($xheader != "") icms_core_Debug::setDeprecated('icms_module_header', sprintf(_CORE_REMOVE_IN_VERSION, "2.0"));
        $header = ($header != "") ? $header : $xheader;
        $this->template->assign('xoops_module_header', $header . "\n" . $this->renderOldMetas(NULL, TRUE));
        $this->template->assign('icms_module_header', $header . "\n" . $this->renderOldMetas(NULL, TRUE));

        /* create template vars for the new meta zones */
        foreach ($this->metas as $zone => $value) {
            $this->template->assign($zone, "<!-- " . ucfirst($zone) . " section-->\n" . $this->renderMetas(NULL, TRUE, $zone));
        }

        $pagetitle = empty($xoopsOption['icms_pagetitle'])
            ? $this->template->get_template_vars('icms_pagetitle')
            : $xoopsOption['icms_pagetitle'];
        /** @todo   Remove xoops_pagetitle in 2.0 */
        $xpagetitle = empty($xoopsOption['xoops_pagetitle'])
            ? $this->template->get_template_vars('xoops_pagetitle')
            : $xoopsOption['xoops_pagetitle'];
        if ($xpagetitle != "") icms_core_Debug::setDeprecated('icms_pagetitle', sprintf(_CORE_REMOVE_IN_VERSION, "2.0"));
        $pagetitle = ($pagetitle != "") ? $pagetitle : $xpagetitle;
        $this->template->assign('xoops_pagetitle', $pagetitle);
        $this->template->assign('icms_pagetitle', $pagetitle);

        // Do not cache the main (theme.html) template output
        $this->template->caching = 0;
        $this->template->display($this->path . '/' . $this->canvasTemplate);

        $this->renderCount++;
        icms::$logger->stopTime('Page rendering');
    }

    /**#@+ @tasktype 20 Manipulating page meta-information*/
    /**
     * Adds script code to the document head
     *
     * This methods allows the insertion of an external script file (if $src is provided), or
     * of a script snippet. The file URI is parsed to take benefit of the theme resource
     * overloading system.
     *
     * The $attributes parameter allows you to specify the attributes that will be added to the
     * inserted <script> tag. If unspecified, the <var>type</var> attribute value will default to
     * 'text/javascript'.
     *
     * <code>
     * // Add an external script using a physical path
     * $theme->addScript('www/script.js', NULL, '');
     * $theme->addScript('modules/newbb/script.js', NULL, '');
     * // Specify attributes for the <script> tag
     * $theme->addScript('mod_xoops_SiteManager#common.js', array('type' => 'application/x-javascript'), '');
     * // Insert a code snippet
     * $theme->addScript(NULL, array('type' => 'application/x-javascript'), 'window.open("Hello world");');
     * </code>
     *
     * @param string $src path to an external script file
     * @param array $attributes hash of attributes to add to the <script> tag
     * @param string $content Code snippet to output within the <script> tag
     * @param   str $zone   Area of the HTML page to place the script
     * @param   int $weight Sort factor - lower weights are loaded first
     *
     * @return void
     **/
    public function addScript($src = '', $attributes = array(), $content = '', $zone = 'module', $weight = 0) {

        if (empty($attributes)) {
            $attributes = array();
        }
        if (!empty($src)) {
            $attributes['src'] = icms::url($this->resourcePath($src));
        }
        if (!empty($content)) {
            $attributes['_'] = $content;
        }
        if (!isset($attributes['type'])) {
            $attributes['type'] = 'text/javascript';
        }
        $this->addMeta('script', $src, $attributes, $zone, $weight);
    }

    /**
     * Add StyleSheet or CSS code to the document head
     * @param string $src path to .css file
     * @param array $attributes name => value paired array of attributes such as title
     * @param string $content CSS code to output between the <style> tags (in case $src is empty)
     * @param   str $zone   Area of the HTML page to place the stylesheet
     * @param   int $weight Sort factor - lower weights are loaded first
     *
     * @return void
     **/
    public function addStylesheet($src = '', $attributes = array(), $content = '', $zone = 'module', $weight = 0) {

        if (empty($attributes)) {
            $attributes = array();
        }
        if (!empty($src)) {
            $attributes['href'] = icms::url($this->resourcePath($src));
        }
        if (!isset($attributes['type'])) {
            $attributes['type'] = 'text/css';
        }
        if (!empty($content)) {
            $attributes['_'] = $content;
        }
        $this->addMeta('stylesheet', $src, $attributes, $zone, $weight);
    }

    /**
     * Add a <link> to the header
     * @param string    $rel        Relationship from the current doc to the anchored one
     * @param string    $href       URI of the anchored document
     * @param array     $attributes Additional attributes to add to the <link> element
     * @param   str $zone   Area of the HTML page to place the link
     * @param   int $weight Sort factor - lower weights are loaded first
     */
    public function addLink($rel, $href = '', $attributes = array(), $zone = 'module', $weight = 0) {


        if (empty($attributes)) {
            $attributes = array();
        }
        if (!empty($href)) {
            $attributes['href'] = $href;
        }
        $this->addMeta('link', $rel, $attributes, $zone, $weight);
    }

    /**
     * Set a meta http-equiv value
     * @param   str $zone   Area of the HTML page to place the http meta
     * @param   int $weight Sort factor - lower weights are loaded first
     */
    public function addHttpMeta($name, $value = NULL, $zone = 'module', $weight = 0) {
        if (isset($value)) {
            return $this->addMeta('http', $name, $value, $zone, $weight);
        }
        unset($this->metas[$zone]['http'][$name]);
    }

    /**
     * Set a meta property value, mostly used by Facebook Graph nowadays
     * @param   str $zone   Area of the HTML page to place the property meta
     * @param   int $weight Sort factor - lower weights are loaded first
     */
    public function addPropertyMeta($name, $value = NULL, $zone = 'module', $weight = 0) {
        if (isset($value)) {
            return $this->addMeta('property', $name, $value, $zone, $weight);
        }
        unset($this->metas[$zone]['property'][$name]);
    }

    /**
     * Set a meta itemprop value, mostly used by Google+ nowadays
     * @param   str $zone   Area of the HTML page to place the itemprop meta
     * @param   int $weight Sort factor - lower weights are loaded first
     */
    public function addItempropMeta($name, $value = NULL, $zone = 'module', $weight = 0) {
        if (isset($value)) {
            return $this->addMeta('itemprop', $name, $value, $zone, $weight);
        }
        unset($this->metas[$zone]['itemprop'][$name]);
    }

    /**
     * Change output page meta-information
     *
     * @param   str $type   Type of meta tag: script, link, stylesheet, http
     * @param   str $name   Name
     * @param   str $value
     * @param   str $zone   Area of the HTML page to place the meta
     * @param   int $weight Sort factor - lower weights are loaded first
     */
    function addMeta($type = 'meta', $name = '', $value = '', $zone = 'module', $weight = 0) {
        !empty($zone) || $zone = 'module';
        if (!isset($this->metas[$zone][$type])) {
            $this->metas[$zone][$type] = array();
        }
        if (!empty($name)) {
            $this->metas[$zone][$type][$name] = array('value' => $value, 'weight' => $weight);
        } else {
            $this->metas[$zone][$type][] = array('value' => $value, 'weight' => $weight);
        }

        return $value;
    }

    /**
     * Puts $content into the htmlheadstrings array
     *
     * @param   string  $params
     * @param   string  $content    content to put in the htmlheadstrings array
     * @param   string  &$smarty
     * @param   string  &$repeat
     */
    public function headContent($params, $content, &$smarty, &$repeat) {
        if (!$repeat) {
            $this->htmlHeadStrings[] = $content;
        }
    }

    /**
     * Render the meta content in the metas array (carefull Recursive!)
     *
     * @param   string  $type     what type of metacontent is it
     * @param   string  $return   will we return to the calling function (just default setting)
     * @return  bool
     */
    public function renderMetas($type = NULL, $return = FALSE, $zone = 'module') {
        $str = '';
        if (!isset($type)) {
            if (!is_array($this->metas[$zone])) return;
            $types = $this->types;
            $usedTypes = array_keys($this->metas[$zone]);
            foreach (array_intersect($types, $usedTypes) as $type) {
                $str .= $this->renderMetas($type, TRUE, $zone);
            }
            $str .= implode("\n", $this->htmlHeadStrings);
        } else {
            $sort = array();
            foreach($this->metas[$zone][$type] as $name => $item) {
                $sort[] = $item['weight'];
            }
            array_multisort(array_values($sort), array_keys($sort), $this->metas[$zone][$type]);
            switch($type) {
                case 'script':
                    foreach ($this->metas[$zone][$type] as $attrs) {
                        $str .= '<script' . $this->renderAttributes($attrs['value']) . ">";
                        if (@$attrs['value']['_']) {
                            $str .= "\n" . $attrs['value']['_'] . "\n";
                        }
                        $str .= "</script>\n";
                    }
                    break;

                case 'link':
                    foreach ($this->metas[$zone][$type] as $rel => $attrs) {
                        $str .= '<link rel="' . $rel . '"' . $this->renderAttributes($attrs['value']) . " />\n";
                    }
                    break;

                case 'stylesheet':
                    foreach ($this->metas[$zone][$type] as $attrs) {
                        if (@$attrs['value']['_']) {
                            $str .= '<style' . $this->renderAttributes($attrs['value']) . ">\n" . $attrs['value']['_'] . "\n</style>";
                        } else {
                            $str .= '<link rel="stylesheet"' . $this->renderAttributes($attrs['value']) . " />\n";
                        }
                    }
                    break;

                case 'http':
                    foreach ($this->metas[$zone][$type] as $name => $content) {
                        $str .= '<meta http-equiv="' . htmlspecialchars($name, ENT_QUOTES) . '" content="' . htmlspecialchars($content, ENT_QUOTES) . "\" />\n";
                    }
                    break;

                case 'property':
                    foreach ($this->metas[$zone][$type] as $name => $content) {
                        $str .= '<meta property="' . htmlspecialchars($name, ENT_QUOTES) . '" content="' . htmlspecialchars($content, ENT_QUOTES) . "\" />\n";
                    }
                    break;

                case 'itemprop':
                    foreach ($this->metas[$zone][$type] as $name => $content) {
                        $str .= '<meta itemprop="' . htmlspecialchars($name, ENT_QUOTES) . '" content="' . htmlspecialchars($content, ENT_QUOTES) . "\" />\n";
                    }
                    break;


                default:
                    foreach ($this->metas[$zone][$type] as $name => $content) {
                        $str .= '<meta name="' . htmlspecialchars($name, ENT_QUOTES) . '" content="' . htmlspecialchars($content['value'], ENT_QUOTES) . "\" />\n";
                    }
                    break;
            }
        }
        if ($return) {
            return $str;
        }
        echo $str;
        return TRUE;
    }
    /**
     * Legacy method to render all the zones as a single zone
     *
     * @param   str     $type
     * @param   bool    $return
     * @return  str     string of the old metas
     */
    public function renderOldMetas($type = NULL, $return = TRUE) {
        $str = '';
        // loop through and render all the zones
        foreach ($this->metas as $z => $values) {
            $str .= $this->renderMetas($type, TRUE, $z);
        }
        return $str;
    }

    /**
     * Generates a unique element ID
     * @param string $tagName
     * @return string
     */
    public function genElementId($tagName = 'xos') {
        static $cache = array();
        if (!isset($cache[$tagName])) {
            $cache[$tagName] = 1;
        }
        return $tagName . '-' . $cache[$tagName]++;
    }

    /**
     * Transform an attributes collection to an XML string
     * @param array $coll
     * @return string
     */
    public function renderAttributes($coll) {
        $str = '';
        foreach ($coll as $name => $val) {
            if ($name != '_') {
                $str .= ' ' . $name . '="' . htmlspecialchars($val, ENT_QUOTES) . '"';
            }
        }
        return $str;
    }

    /**
     * Return a themable file resource path
     *
     * @param string $path
     * @return string
     */
    public function resourcePath($path) {

        if (substr($path, 0, 1) == '/') {
            $path = substr($path, 1);
        }
        if (file_exists("$this->path/$path")) {
            return "themes/$this->folderName/$path";
        }
        return $path;
    }
}