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✏️ Editing: Smarty.class.php

<?php
/**
 * Project:     Smarty: the PHP compiling template engine
 * File:        Smarty.class.php
 * SVN:         $Id: Smarty.class.php 4694 2013-01-13 21:13:14Z uwe.tews@googlemail.com $
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For questions, help, comments, discussion, etc., please join the
 * Smarty mailing list. Send a blank e-mail to
 * smarty-discussion-subscribe@googlegroups.com
 *
 * @link http://www.smarty.net/
 * @copyright 2008 New Digital Group, Inc.
 * @author Monte Ohrt <monte at ohrt dot com>
 * @author Uwe Tews
 * @author Rodney Rehm
 * @package Smarty
 * @version 3.1.13
 */

/**
 * define shorthand directory separator constant
 */
if (!defined('DS')) {
    define('DS', DIRECTORY_SEPARATOR);
}

/**
 * set SMARTY_DIR to absolute path to Smarty library files.
 * Sets SMARTY_DIR only if user application has not already defined it.
 */
if (!defined('SMARTY_DIR')) {
    define('SMARTY_DIR', dirname(__FILE__) . DS);
}

/**
 * set SMARTY_SYSPLUGINS_DIR to absolute path to Smarty internal plugins.
 * Sets SMARTY_SYSPLUGINS_DIR only if user application has not already defined it.
 */
if (!defined('SMARTY_SYSPLUGINS_DIR')) {
    define('SMARTY_SYSPLUGINS_DIR', SMARTY_DIR . 'sysplugins' . DS);
}
if (!defined('SMARTY_PLUGINS_DIR')) {
    define('SMARTY_PLUGINS_DIR', SMARTY_DIR . 'plugins' . DS);
}
if (!defined('SMARTY_MBSTRING')) {
    define('SMARTY_MBSTRING', function_exists('mb_split'));
}
if (!defined('SMARTY_RESOURCE_CHAR_SET')) {
    // UTF-8 can only be done properly when mbstring is available!
    /**
     * @deprecated in favor of Smarty::$_CHARSET
     */
    define('SMARTY_RESOURCE_CHAR_SET', SMARTY_MBSTRING ? 'UTF-8' : 'ISO-8859-1');
}
if (!defined('SMARTY_RESOURCE_DATE_FORMAT')) {
    /**
     * @deprecated in favor of Smarty::$_DATE_FORMAT
     */
    define('SMARTY_RESOURCE_DATE_FORMAT', '%b %e, %Y');
}

/**
 * register the class autoloader
 */
if (!defined('SMARTY_SPL_AUTOLOAD')) {
    define('SMARTY_SPL_AUTOLOAD', 0);
}

if (SMARTY_SPL_AUTOLOAD && set_include_path(get_include_path() . PATH_SEPARATOR . SMARTY_SYSPLUGINS_DIR) !== false) {
    $registeredAutoLoadFunctions = spl_autoload_functions();
    if (!isset($registeredAutoLoadFunctions['spl_autoload'])) {
        spl_autoload_register();
    }
} else {
    spl_autoload_register('smartyAutoload');
}

/**
 * Load always needed external class files
 */
include_once SMARTY_SYSPLUGINS_DIR.'smarty_internal_data.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_internal_templatebase.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_internal_template.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_resource.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_internal_resource_file.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_cacheresource.php';
include_once SMARTY_SYSPLUGINS_DIR.'smarty_internal_cacheresource_file.php';

/**
 * This is the main Smarty class
 * @package Smarty
 */
class Smarty extends Smarty_Internal_TemplateBase {

/**#@+
     * constant definitions
     */

/**
     * smarty version
     */
    const SMARTY_VERSION = 'Smarty-3.1.13';

/**
     * define variable scopes
     */
    const SCOPE_LOCAL = 0;
    const SCOPE_PARENT = 1;
    const SCOPE_ROOT = 2;
    const SCOPE_GLOBAL = 3;
    /**
     * define caching modes
     */
    const CACHING_OFF = 0;
    const CACHING_LIFETIME_CURRENT = 1;
    const CACHING_LIFETIME_SAVED = 2;
    /**
     * define compile check modes
     */
    const COMPILECHECK_OFF = 0;
    const COMPILECHECK_ON = 1;
    const COMPILECHECK_CACHEMISS = 2;
    /**
     * modes for handling of "<?php ... ?>" tags in templates.
     */
    const PHP_PASSTHRU = 0; //-> print tags as plain text
    const PHP_QUOTE = 1; //-> escape tags as entities
    const PHP_REMOVE = 2; //-> escape tags as entities
    const PHP_ALLOW = 3; //-> escape tags as entities
    /**
     * filter types
     */
    const FILTER_POST = 'post';
    const FILTER_PRE = 'pre';
    const FILTER_OUTPUT = 'output';
    const FILTER_VARIABLE = 'variable';
    /**
     * plugin types
     */
    const PLUGIN_FUNCTION = 'function';
    const PLUGIN_BLOCK = 'block';
    const PLUGIN_COMPILER = 'compiler';
    const PLUGIN_MODIFIER = 'modifier';
    const PLUGIN_MODIFIERCOMPILER = 'modifiercompiler';

/**#@-*/

/**
     * assigned global tpl vars
     */
    public static $global_tpl_vars = array();

/**
     * error handler returned by set_error_hanlder() in Smarty::muteExpectedErrors()
     */
    public static $_previous_error_handler = null;
    /**
     * contains directories outside of SMARTY_DIR that are to be muted by muteExpectedErrors()
     */
    public static $_muted_directories = array();
    /**
     * Flag denoting if Multibyte String functions are available
     */
    public static $_MBSTRING = SMARTY_MBSTRING;
    /**
     * The character set to adhere to (e.g. "UTF-8")
     */
    public static $_CHARSET = SMARTY_RESOURCE_CHAR_SET;
    /**
     * The date format to be used internally
     * (accepts date() and strftime())
     */
    public static $_DATE_FORMAT = SMARTY_RESOURCE_DATE_FORMAT;
    /**
     * Flag denoting if PCRE should run in UTF-8 mode
     */
    public static $_UTF8_MODIFIER = 'u';

/**
     * Flag denoting if operating system is windows
     */
    public static $_IS_WINDOWS = false;

/**#@+
     * variables
     */

/**
     * auto literal on delimiters with whitspace
     * @var boolean
     */
    public $auto_literal = true;
    /**
     * display error on not assigned variables
     * @var boolean
     */
    public $error_unassigned = false;
    /**
     * look up relative filepaths in include_path
     * @var boolean
     */
    public $use_include_path = false;
    /**
     * template directory
     * @var array
     */
    private $template_dir = array();
    /**
     * joined template directory string used in cache keys
     * @var string
     */
    public $joined_template_dir = null;
    /**
     * joined config directory string used in cache keys
     * @var string
     */
    public $joined_config_dir = null;
    /**
     * default template handler
     * @var callable
     */
    public $default_template_handler_func = null;
    /**
     * default config handler
     * @var callable
     */
    public $default_config_handler_func = null;
    /**
     * default plugin handler
     * @var callable
     */
    public $default_plugin_handler_func = null;
    /**
     * compile directory
     * @var string
     */
    private $compile_dir = null;
    /**
     * plugins directory
     * @var array
     */
    private $plugins_dir = array();
    /**
     * cache directory
     * @var string
     */
    private $cache_dir = null;
    /**
     * config directory
     * @var array
     */
    private $config_dir = array();
    /**
     * force template compiling?
     * @var boolean
     */
    public $force_compile = false;
    /**
     * check template for modifications?
     * @var boolean
     */
    public $compile_check = true;
    /**
     * use sub dirs for compiled/cached files?
     * @var boolean
     */
    public $use_sub_dirs = false;
    /**
     * allow ambiguous resources (that are made unique by the resource handler)
     * @var boolean
     */
    public $allow_ambiguous_resources = false;
    /**
     * caching enabled
     * @var boolean
     */
    public $caching = false;
    /**
     * merge compiled includes
     * @var boolean
     */
    public $merge_compiled_includes = false;
    /**
     * cache lifetime in seconds
     * @var integer
     */
    public $cache_lifetime = 3600;
    /**
     * force cache file creation
     * @var boolean
     */
    public $force_cache = false;
    /**
     * Set this if you want different sets of cache files for the same
     * templates.
     *
     * @var string
     */
    public $cache_id = null;
    /**
     * Set this if you want different sets of compiled files for the same
     * templates.
     *
     * @var string
     */
    public $compile_id = null;
    /**
     * template left-delimiter
     * @var string
     */
    public $left_delimiter = "{";
    /**
     * template right-delimiter
     * @var string
     */
    public $right_delimiter = "}";
    /**#@+
     * security
     */
    /**
     * class name
     *
     * This should be instance of Smarty_Security.
     *
     * @var string
     * @see Smarty_Security
     */
    public $security_class = 'Smarty_Security';
    /**
     * implementation of security class
     *
     * @var Smarty_Security
     */
    public $security_policy = null;
    /**
     * controls handling of PHP-blocks
     *
     * @var integer
     */
    public $php_handling = self::PHP_PASSTHRU;
    /**
     * controls if the php template file resource is allowed
     *
     * @var bool
     */
    public $allow_php_templates = false;
    /**
     * Should compiled-templates be prevented from being called directly?
     *
     * {@internal
     * Currently used by Smarty_Internal_Template only.
     * }}
     *
     * @var boolean
     */
    public $direct_access_security = true;
    /**#@-*/
    /**
     * debug mode
     *
     * Setting this to true enables the debug-console.
     *
     * @var boolean
     */
    public $debugging = false;
    /**
     * This determines if debugging is enable-able from the browser.
     * <ul>
     *  <li>NONE => no debugging control allowed</li>
     *  <li>URL => enable debugging when SMARTY_DEBUG is found in the URL.</li>
     * </ul>
     * @var string
     */
    public $debugging_ctrl = 'NONE';
    /**
     * Name of debugging URL-param.
     *
     * Only used when $debugging_ctrl is set to 'URL'.
     * The name of the URL-parameter that activates debugging.
     *
     * @var type
     */
    public $smarty_debug_id = 'SMARTY_DEBUG';
    /**
     * Path of debug template.
     * @var string
     */
    public $debug_tpl = null;
    /**
     * When set, smarty uses this value as error_reporting-level.
     * @var int
     */
    public $error_reporting = null;
    /**
     * Internal flag for getTags()
     * @var boolean
     */
    public $get_used_tags = false;

/**#@+
     * config var settings
     */

/**
     * Controls whether variables with the same name overwrite each other.
     * @var boolean
     */
    public $config_overwrite = true;
    /**
     * Controls whether config values of on/true/yes and off/false/no get converted to boolean.
     * @var boolean
     */
    public $config_booleanize = true;
    /**
     * Controls whether hidden config sections/vars are read from the file.
     * @var boolean
     */
    public $config_read_hidden = false;

/**#@-*/

/**#@+
     * resource locking
     */

/**
     * locking concurrent compiles
     * @var boolean
     */
    public $compile_locking = true;
    /**
     * Controls whether cache resources should emply locking mechanism
     * @var boolean
     */
    public $cache_locking = false;
    /**
     * seconds to wait for acquiring a lock before ignoring the write lock
     * @var float
     */
    public $locking_timeout = 10;

/**#@-*/

/**
     * global template functions
     * @var array
     */
    public $template_functions = array();
    /**
     * resource type used if none given
     *
     * Must be an valid key of $registered_resources.
     * @var string
     */
    public $default_resource_type = 'file';
    /**
     * caching type
     *
     * Must be an element of $cache_resource_types.
     *
     * @var string
     */
    public $caching_type = 'file';
    /**
     * internal config properties
     * @var array
     */
    public $properties = array();
    /**
     * config type
     * @var string
     */
    public $default_config_type = 'file';
    /**
     * cached template objects
     * @var array
     */
    public $template_objects = array();
    /**
     * check If-Modified-Since headers
     * @var boolean
     */
    public $cache_modified_check = false;
    /**
     * registered plugins
     * @var array
     */
    public $registered_plugins = array();
    /**
     * plugin search order
     * @var array
     */
    public $plugin_search_order = array('function', 'block', 'compiler', 'class');
    /**
     * registered objects
     * @var array
     */
    public $registered_objects = array();
    /**
     * registered classes
     * @var array
     */
    public $registered_classes = array();
    /**
     * registered filters
     * @var array
     */
    public $registered_filters = array();
    /**
     * registered resources
     * @var array
     */
    public $registered_resources = array();
    /**
     * resource handler cache
     * @var array
     */
    public $_resource_handlers = array();
    /**
     * registered cache resources
     * @var array
     */
    public $registered_cache_resources = array();
    /**
     * cache resource handler cache
     * @var array
     */
    public $_cacheresource_handlers = array();
    /**
     * autoload filter
     * @var array
     */
    public $autoload_filters = array();
    /**
     * default modifier
     * @var array
     */
    public $default_modifiers = array();
    /**
     * autoescape variable output
     * @var boolean
     */
    public $escape_html = false;
    /**
     * global internal smarty vars
     * @var array
     */
    public static $_smarty_vars = array();
    /**
     * start time for execution time calculation
     * @var int
     */
    public $start_time = 0;
    /**
     * default file permissions
     * @var int
     */
    public $_file_perms = 0644;
    /**
     * default dir permissions
     * @var int
     */
    public $_dir_perms = 0771;
    /**
     * block tag hierarchy
     * @var array
     */
    public $_tag_stack = array();
    /**
     * self pointer to Smarty object
     * @var Smarty
     */
    public $smarty;
    /**
     * required by the compiler for BC
     * @var string
     */
    public $_current_file = null;
    /**
     * internal flag to enable parser debugging
     * @var bool
     */
    public $_parserdebug = false;
    /**
     * Saved parameter of merged templates during compilation
     *
     * @var array
     */
    public $merged_templates_func = array();
    /**#@-*/

/**
     * Initialize new Smarty object
     *
     */
    public function __construct()
    {
        // selfpointer needed by some other class methods
        $this->smarty = $this;
        if (is_callable('mb_internal_encoding')) {
            mb_internal_encoding(Smarty::$_CHARSET);
        }
        $this->start_time = microtime(true);
        // set default dirs
        $this->setTemplateDir('.' . DS . 'templates' . DS)
            ->setCompileDir('.' . DS . 'templates_c' . DS)
            ->setPluginsDir(SMARTY_PLUGINS_DIR)
            ->setCacheDir('.' . DS . 'cache' . DS)
            ->setConfigDir('.' . DS . 'configs' . DS);

$this->debug_tpl = 'file:' . dirname(__FILE__) . '/debug.tpl';
        if (isset($_SERVER['SCRIPT_NAME'])) {
            $this->assignGlobal('SCRIPT_NAME', $_SERVER['SCRIPT_NAME']);
        }
    }

/**
     * Class destructor
     */
    public function __destruct()
    {
        // intentionally left blank
    }

/**
     * <<magic>> set selfpointer on cloned object
     */
    public function __clone()
    {
        $this->smarty = $this;
    }

/**
     * <<magic>> Generic getter.
     *
     * Calls the appropriate getter function.
     * Issues an E_USER_NOTICE if no valid getter is found.
     *
     * @param string $name property name
     * @return mixed
     */
    public function __get($name)
    {
        $allowed = array(
        'template_dir' => 'getTemplateDir',
        'config_dir' => 'getConfigDir',
        'plugins_dir' => 'getPluginsDir',
        'compile_dir' => 'getCompileDir',
        'cache_dir' => 'getCacheDir',
        );

if (isset($allowed[$name])) {
            return $this->{$allowed[$name]}();
        } else {
            trigger_error('Undefined property: '. get_class($this) .'::$'. $name, E_USER_NOTICE);
        }
    }

/**
     * <<magic>> Generic setter.
     *
     * Calls the appropriate setter function.
     * Issues an E_USER_NOTICE if no valid setter is found.
     *
     * @param string $name  property name
     * @param mixed  $value parameter passed to setter
     */
    public function __set($name, $value)
    {
        $allowed = array(
        'template_dir' => 'setTemplateDir',
        'config_dir' => 'setConfigDir',
        'plugins_dir' => 'setPluginsDir',
        'compile_dir' => 'setCompileDir',
        'cache_dir' => 'setCacheDir',
        );

if (isset($allowed[$name])) {
            $this->{$allowed[$name]}($value);
        } else {
            trigger_error('Undefined property: ' . get_class($this) . '::$' . $name, E_USER_NOTICE);
        }
    }

/**
     * Check if a template resource exists
     *
     * @param string $resource_name template name
     * @return boolean status
     */
    public function templateExists($resource_name)
    {
        // create template object
        $save = $this->template_objects;
        $tpl = new $this->template_class($resource_name, $this);
        // check if it does exists
        $result = $tpl->source->exists;
        $this->template_objects = $save;
        return $result;
    }

/**
     * Returns a single or all global  variables
     *
     * @param object $smarty
     * @param string $varname variable name or null
     * @return string variable value or or array of variables
     */
    public function getGlobal($varname = null)
    {
        if (isset($varname)) {
            if (isset(self::$global_tpl_vars[$varname])) {
                return self::$global_tpl_vars[$varname]->value;
            } else {
                return '';
            }
        } else {
            $_result = array();
            foreach (self::$global_tpl_vars AS $key => $var) {
                $_result[$key] = $var->value;
            }
            return $_result;
        }
    }

/**
     * Empty cache folder
     *
     * @param integer $exp_time expiration time
     * @param string  $type     resource type
     * @return integer number of cache files deleted
     */
    function clearAllCache($exp_time = null, $type = null)
    {
        // load cache resource and call clearAll
        $_cache_resource = Smarty_CacheResource::load($this, $type);
        Smarty_CacheResource::invalidLoadedCache($this);
        return $_cache_resource->clearAll($this, $exp_time);
    }

/**
     * Empty cache for a specific template
     *
     * @param string  $template_name template name
     * @param string  $cache_id      cache id
     * @param string  $compile_id    compile id
     * @param integer $exp_time      expiration time
     * @param string  $type          resource type
     * @return integer number of cache files deleted
     */
    public function clearCache($template_name, $cache_id = null, $compile_id = null, $exp_time = null, $type = null)
    {
        // load cache resource and call clear
        $_cache_resource = Smarty_CacheResource::load($this, $type);
        Smarty_CacheResource::invalidLoadedCache($this);
        return $_cache_resource->clear($this, $template_name, $cache_id, $compile_id, $exp_time);
    }

/**
     * Loads security class and enables security
     *
     * @param string|Smarty_Security $security_class if a string is used, it must be class-name
     * @return Smarty current Smarty instance for chaining
     * @throws SmartyException when an invalid class name is provided
     */
    public function enableSecurity($security_class = null)
    {
        if ($security_class instanceof Smarty_Security) {
            $this->security_policy = $security_class;
            return $this;
        } elseif (is_object($security_class)) {
            throw new SmartyException("Class '" . get_class($security_class) . "' must extend Smarty_Security.");
        }
        if ($security_class == null) {
            $security_class = $this->security_class;
        }
        if (!class_exists($security_class)) {
            throw new SmartyException("Security class '$security_class' is not defined");
        } elseif ($security_class !== 'Smarty_Security' && !is_subclass_of($security_class, 'Smarty_Security')) {
            throw new SmartyException("Class '$security_class' must extend Smarty_Security.");
        } else {
            $this->security_policy = new $security_class($this);
        }

return $this;
    }

/**
     * Disable security
     * @return Smarty current Smarty instance for chaining
     */
    public function disableSecurity()
    {
        $this->security_policy = null;

return $this;
    }

/**
     * Set template directory
     *
     * @param string|array $template_dir directory(s) of template sources
     * @return Smarty current Smarty instance for chaining
     */
    public function setTemplateDir($template_dir)
    {
        $this->template_dir = array();
        foreach ((array) $template_dir as $k => $v) {
            $this->template_dir[$k] = rtrim($v, '/\\') . DS;
        }

$this->joined_template_dir = join(DIRECTORY_SEPARATOR, $this->template_dir);
        return $this;
    }

/**
     * Add template directory(s)
     *
     * @param string|array $template_dir directory(s) of template sources
     * @param string       $key          of the array element to assign the template dir to
     * @return Smarty current Smarty instance for chaining
     * @throws SmartyException when the given template directory is not valid
     */
    public function addTemplateDir($template_dir, $key=null)
    {
        // make sure we're dealing with an array
        $this->template_dir = (array) $this->template_dir;

if (is_array($template_dir)) {
            foreach ($template_dir as $k => $v) {
                if (is_int($k)) {
                    // indexes are not merged but appended
                    $this->template_dir[] = rtrim($v, '/\\') . DS;
                } else {
                    // string indexes are overridden
                    $this->template_dir[$k] = rtrim($v, '/\\') . DS;
                }
            }
        } elseif ($key !== null) {
            // override directory at specified index
            $this->template_dir[$key] = rtrim($template_dir, '/\\') . DS;
        } else {
            // append new directory
            $this->template_dir[] = rtrim($template_dir, '/\\') . DS;
        }
        $this->joined_template_dir = join(DIRECTORY_SEPARATOR, $this->template_dir);
        return $this;
    }

/**
     * Get template directories
     *
     * @param mixed index of directory to get, null to get all
     * @return array|string list of template directories, or directory of $index
     */
    public function getTemplateDir($index=null)
    {
        if ($index !== null) {
            return isset($this->template_dir[$index]) ? $this->template_dir[$index] : null;
        }

return (array)$this->template_dir;
    }

/**
     * Set config directory
     *
     * @param string|array $template_dir directory(s) of configuration sources
     * @return Smarty current Smarty instance for chaining
     */
    public function setConfigDir($config_dir)
    {
        $this->config_dir = array();
        foreach ((array) $config_dir as $k => $v) {
            $this->config_dir[$k] = rtrim($v, '/\\') . DS;
        }

$this->joined_config_dir = join(DIRECTORY_SEPARATOR, $this->config_dir);
        return $this;
    }

/**
     * Add config directory(s)
     *
     * @param string|array $config_dir directory(s) of config sources
     * @param string key of the array element to assign the config dir to
     * @return Smarty current Smarty instance for chaining
     */
    public function addConfigDir($config_dir, $key=null)
    {
        // make sure we're dealing with an array
        $this->config_dir = (array) $this->config_dir;

if (is_array($config_dir)) {
            foreach ($config_dir as $k => $v) {
                if (is_int($k)) {
                    // indexes are not merged but appended
                    $this->config_dir[] = rtrim($v, '/\\') . DS;
                } else {
                    // string indexes are overridden
                    $this->config_dir[$k] = rtrim($v, '/\\') . DS;
                }
            }
        } elseif( $key !== null ) {
            // override directory at specified index
            $this->config_dir[$key] = rtrim($config_dir, '/\\') . DS;
        } else {
            // append new directory
            $this->config_dir[] = rtrim($config_dir, '/\\') . DS;
        }

$this->joined_config_dir = join(DIRECTORY_SEPARATOR, $this->config_dir);
        return $this;
    }

/**
     * Get config directory
     *
     * @param mixed index of directory to get, null to get all
     * @return array|string configuration directory
     */
    public function getConfigDir($index=null)
    {
        if ($index !== null) {
            return isset($this->config_dir[$index]) ? $this->config_dir[$index] : null;
        }

return (array)$this->config_dir;
    }

/**
     * Set plugins directory
     *
     * @param string|array $plugins_dir directory(s) of plugins
     * @return Smarty current Smarty instance for chaining
     */
    public function setPluginsDir($plugins_dir)
    {
        $this->plugins_dir = array();
        foreach ((array)$plugins_dir as $k => $v) {
            $this->plugins_dir[$k] = rtrim($v, '/\\') . DS;
        }

return $this;
    }

/**
     * Adds directory of plugin files
     *
     * @param object $smarty
     * @param string $ |array $ plugins folder
     * @return Smarty current Smarty instance for chaining
     */
    public function addPluginsDir($plugins_dir)
    {
        // make sure we're dealing with an array
        $this->plugins_dir = (array) $this->plugins_dir;

if (is_array($plugins_dir)) {
            foreach ($plugins_dir as $k => $v) {
                if (is_int($k)) {
                    // indexes are not merged but appended
                    $this->plugins_dir[] = rtrim($v, '/\\') . DS;
                } else {
                    // string indexes are overridden
                    $this->plugins_dir[$k] = rtrim($v, '/\\') . DS;
                }
            }
        } else {
            // append new directory
            $this->plugins_dir[] = rtrim($plugins_dir, '/\\') . DS;
        }

$this->plugins_dir = array_unique($this->plugins_dir);
        return $this;
    }

/**
     * Get plugin directories
     *
     * @return array list of plugin directories
     */
    public function getPluginsDir()
    {
        return (array)$this->plugins_dir;
    }

/**
     * Set compile directory
     *
     * @param string $compile_dir directory to store compiled templates in
     * @return Smarty current Smarty instance for chaining
     */
    public function setCompileDir($compile_dir)
    {
        $this->compile_dir = rtrim($compile_dir, '/\\') . DS;
        if (!isset(Smarty::$_muted_directories[$this->compile_dir])) {
            Smarty::$_muted_directories[$this->compile_dir] = null;
        }
        return $this;
    }

/**
     * Get compiled directory
     *
     * @return string path to compiled templates
     */
    public function getCompileDir()
    {
        return $this->compile_dir;
    }

/**
     * Set cache directory
     *
     * @param string $cache_dir directory to store cached templates in
     * @return Smarty current Smarty instance for chaining
     */
    public function setCacheDir($cache_dir)
    {
        $this->cache_dir = rtrim($cache_dir, '/\\') . DS;
        if (!isset(Smarty::$_muted_directories[$this->cache_dir])) {
            Smarty::$_muted_directories[$this->cache_dir] = null;
        }
        return $this;
    }

/**
     * Get cache directory
     *
     * @return string path of cache directory
     */
    public function getCacheDir()
    {
        return $this->cache_dir;
    }

/**
     * Set default modifiers
     *
     * @param array|string $modifiers modifier or list of modifiers to set
     * @return Smarty current Smarty instance for chaining
     */
    public function setDefaultModifiers($modifiers)
    {
        $this->default_modifiers = (array) $modifiers;
        return $this;
    }

/**
     * Add default modifiers
     *
     * @param array|string $modifiers modifier or list of modifiers to add
     * @return Smarty current Smarty instance for chaining
     */
    public function addDefaultModifiers($modifiers)
    {
        if (is_array($modifiers)) {
            $this->default_modifiers = array_merge($this->default_modifiers, $modifiers);
        } else {
            $this->default_modifiers[] = $modifiers;
        }

return $this;
    }

/**
     * Get default modifiers
     *
     * @return array list of default modifiers
     */
    public function getDefaultModifiers()
    {
        return $this->default_modifiers;
    }

/**
     * Set autoload filters
     *
     * @param array $filters filters to load automatically
     * @param string $type "pre", "output", … specify the filter type to set. Defaults to none treating $filters' keys as the appropriate types
     * @return Smarty current Smarty instance for chaining
     */
    public function setAutoloadFilters($filters, $type=null)
    {
        if ($type !== null) {
            $this->autoload_filters[$type] = (array) $filters;
        } else {
            $this->autoload_filters = (array) $filters;
        }

return $this;
    }

/**
     * Add autoload filters
     *
     * @param array $filters filters to load automatically
     * @param string $type "pre", "output", … specify the filter type to set. Defaults to none treating $filters' keys as the appropriate types
     * @return Smarty current Smarty instance for chaining
     */
    public function addAutoloadFilters($filters, $type=null)
    {
        if ($type !== null) {
            if (!empty($this->autoload_filters[$type])) {
                $this->autoload_filters[$type] = array_merge($this->autoload_filters[$type], (array) $filters);
            } else {
                $this->autoload_filters[$type] = (array) $filters;
            }
        } else {
            foreach ((array) $filters as $key => $value) {
                if (!empty($this->autoload_filters[$key])) {
                    $this->autoload_filters[$key] = array_merge($this->autoload_filters[$key], (array) $value);
                } else {
                    $this->autoload_filters[$key] = (array) $value;
                }
            }
        }

return $this;
    }

/**
     * Get autoload filters
     *
     * @param string $type type of filter to get autoloads for. Defaults to all autoload filters
     * @return array array( 'type1' => array( 'filter1', 'filter2', … ) ) or array( 'filter1', 'filter2', …) if $type was specified
     */
    public function getAutoloadFilters($type=null)
    {
        if ($type !== null) {
            return isset($this->autoload_filters[$type]) ? $this->autoload_filters[$type] : array();
        }

return $this->autoload_filters;
    }

/**
     * return name of debugging template
     *
     * @return string
     */
    public function getDebugTemplate()
    {
        return $this->debug_tpl;
    }

/**
     * set the debug template
     *
     * @param string $tpl_name
     * @return Smarty current Smarty instance for chaining
     * @throws SmartyException if file is not readable
     */
    public function setDebugTemplate($tpl_name)
    {
        if (!is_readable($tpl_name)) {
            throw new SmartyException("Unknown file '{$tpl_name}'");
        }
        $this->debug_tpl = $tpl_name;

return $this;
    }

/**
     * creates a template object
     *
     * @param string $template the resource handle of the template file
     * @param mixed $cache_id cache id to be used with this template
     * @param mixed $compile_id compile id to be used with this template
     * @param object $parent next higher level of Smarty variables
     * @param boolean $do_clone flag is Smarty object shall be cloned
     * @return object template object
     */
    public function createTemplate($template, $cache_id = null, $compile_id = null, $parent = null, $do_clone = true)
    {
        if (!empty($cache_id) && (is_object($cache_id) || is_array($cache_id))) {
            $parent = $cache_id;
            $cache_id = null;
        }
        if (!empty($parent) && is_array($parent)) {
            $data = $parent;
            $parent = null;
        } else {
            $data = null;
        }
        // default to cache_id and compile_id of Smarty object
        $cache_id = $cache_id === null ? $this->cache_id : $cache_id;
        $compile_id = $compile_id === null ? $this->compile_id : $compile_id;
        // already in template cache?
        if ($this->allow_ambiguous_resources) {
            $_templateId = Smarty_Resource::getUniqueTemplateName($this, $template) . $cache_id . $compile_id;
        } else {
            $_templateId = $this->joined_template_dir . '#' . $template . $cache_id . $compile_id;
        }
        if (isset($_templateId[150])) {
            $_templateId = sha1($_templateId);
        }
        if ($do_clone) {
            if (isset($this->template_objects[$_templateId])) {
                // return cached template object
                $tpl = clone $this->template_objects[$_templateId];
                $tpl->smarty = clone $tpl->smarty;
                $tpl->parent = $parent;
                $tpl->tpl_vars = array();
                $tpl->config_vars = array();
            } else {
                $tpl = new $this->template_class($template, clone $this, $parent, $cache_id, $compile_id);
            }
        } else {
            if (isset($this->template_objects[$_templateId])) {
                // return cached template object
                $tpl = $this->template_objects[$_templateId];
                $tpl->parent = $parent;
                $tpl->tpl_vars = array();
                $tpl->config_vars = array();
            } else {
                $tpl = new $this->template_class($template, $this, $parent, $cache_id, $compile_id);
            }
        }
        // fill data if present
        if (!empty($data) && is_array($data)) {
            // set up variable values
            foreach ($data as $_key => $_val) {
                $tpl->tpl_vars[$_key] = new Smarty_variable($_val);
            }
        }
        return $tpl;
    }

/**
     * Takes unknown classes and loads plugin files for them
     * class name format: Smarty_PluginType_PluginName
     * plugin filename format: plugintype.pluginname.php
     *
     * @param string $plugin_name    class plugin name to load
     * @param bool   $check          check if already loaded
     * @return string |boolean filepath of loaded file or false
     */
    public function loadPlugin($plugin_name, $check = true)
    {
        // if function or class exists, exit silently (already loaded)
        if ($check && (is_callable($plugin_name) || class_exists($plugin_name, false))) {
            return true;
        }
        // Plugin name is expected to be: Smarty_[Type]_[Name]
        $_name_parts = explode('_', $plugin_name, 3);
        // class name must have three parts to be valid plugin
        // count($_name_parts) < 3 === !isset($_name_parts[2])
        if (!isset($_name_parts[2]) || strtolower($_name_parts[0]) !== 'smarty') {
            throw new SmartyException("plugin {$plugin_name} is not a valid name format");
            return false;
        }
        // if type is "internal", get plugin from sysplugins
        if (strtolower($_name_parts[1]) == 'internal') {
            $file = SMARTY_SYSPLUGINS_DIR . strtolower($plugin_name) . '.php';
            if (file_exists($file)) {
                require_once($file);
                return $file;
            } else {
                return false;
            }
        }
        // plugin filename is expected to be: [type].[name].php
        $_plugin_filename = "{$_name_parts[1]}.{$_name_parts[2]}.php";

$_stream_resolve_include_path = function_exists('stream_resolve_include_path');

// loop through plugin dirs and find the plugin
        foreach($this->getPluginsDir() as $_plugin_dir) {
            $names = array(
                $_plugin_dir . $_plugin_filename,
                $_plugin_dir . strtolower($_plugin_filename),
            );
            foreach ($names as $file) {
                if (file_exists($file)) {
                    require_once($file);
                    return $file;
                }
                if ($this->use_include_path && !preg_match('/^([\/\\\\]|[a-zA-Z]:[\/\\\\])/', $_plugin_dir)) {
                    // try PHP include_path
                    if ($_stream_resolve_include_path) {
                        $file = stream_resolve_include_path($file);
                    } else {
                        $file = Smarty_Internal_Get_Include_Path::getIncludePath($file);
                    }

if ($file !== false) {
                        require_once($file);
                        return $file;
                    }
                }
            }
        }
        // no plugin loaded
        return false;
    }

/**
     * Compile all template files
     *
     * @param string $extension file extension
     * @param bool $force_compile force all to recompile
     * @param int $time_limit
     * @param int $max_errors
     * @return integer number of template files recompiled
     */
    public function compileAllTemplates($extention = '.tpl', $force_compile = false, $time_limit = 0, $max_errors = null)
    {
        return Smarty_Internal_Utility::compileAllTemplates($extention, $force_compile, $time_limit, $max_errors, $this);
    }

/**
     * Compile all config files
     *
     * @param string $extension file extension
     * @param bool $force_compile force all to recompile
     * @param int $time_limit
     * @param int $max_errors
     * @return integer number of template files recompiled
     */
    public function compileAllConfig($extention = '.conf', $force_compile = false, $time_limit = 0, $max_errors = null)
    {
        return Smarty_Internal_Utility::compileAllConfig($extention, $force_compile, $time_limit, $max_errors, $this);
    }

/**
     * Delete compiled template file
     *
     * @param string $resource_name template name
     * @param string $compile_id compile id
     * @param integer $exp_time expiration time
     * @return integer number of template files deleted
     */
    public function clearCompiledTemplate($resource_name = null, $compile_id = null, $exp_time = null)
    {
        return Smarty_Internal_Utility::clearCompiledTemplate($resource_name, $compile_id, $exp_time, $this);
    }

/**
     * Return array of tag/attributes of all tags used by an template
     *
     * @param object $templae template object
     * @return array of tag/attributes
     */
    public function getTags(Smarty_Internal_Template $template)
    {
        return Smarty_Internal_Utility::getTags($template);
    }

/**
     * Run installation test
     *
     * @param array $errors Array to write errors into, rather than outputting them
     * @return boolean true if setup is fine, false if something is wrong
     */
    public function testInstall(&$errors=null)
    {
        return Smarty_Internal_Utility::testInstall($this, $errors);
    }

/**
     * Error Handler to mute expected messages
     *
     * @link http://php.net/set_error_handler
     * @param integer $errno Error level
     * @return boolean
     */
    public static function mutingErrorHandler($errno, $errstr, $errfile, $errline, $errcontext)
    {
        $_is_muted_directory = false;

// add the SMARTY_DIR to the list of muted directories
        if (!isset(Smarty::$_muted_directories[SMARTY_DIR])) {
            $smarty_dir = realpath(SMARTY_DIR);
            if ($smarty_dir !== false) {
                Smarty::$_muted_directories[SMARTY_DIR] = array(
                    'file' => $smarty_dir,
                    'length' => strlen($smarty_dir),
                );
            }
        }

// walk the muted directories and test against $errfile
        foreach (Smarty::$_muted_directories as $key => &$dir) {
            if (!$dir) {
                // resolve directory and length for speedy comparisons
                $file = realpath($key);
                if ($file === false) {
                    // this directory does not exist, remove and skip it
                    unset(Smarty::$_muted_directories[$key]);
                    continue;
                }
                $dir = array(
                    'file' => $file,
                    'length' => strlen($file),
                );
            }
            if (!strncmp($errfile, $dir['file'], $dir['length'])) {
                $_is_muted_directory = true;
                break;
            }
        }

// pass to next error handler if this error did not occur inside SMARTY_DIR
        // or the error was within smarty but masked to be ignored
        if (!$_is_muted_directory || ($errno && $errno & error_reporting())) {
            if (Smarty::$_previous_error_handler) {
                return call_user_func(Smarty::$_previous_error_handler, $errno, $errstr, $errfile, $errline, $errcontext);
            } else {
                return false;
            }
        }
    }

/**
     * Enable error handler to mute expected messages
     *
     * @return void
     */
    public static function muteExpectedErrors()
    {
        /*
            error muting is done because some people implemented custom error_handlers using
            http://php.net/set_error_handler and for some reason did not understand the following paragraph:

It is important to remember that the standard PHP error handler is completely bypassed for the
                error types specified by error_types unless the callback function returns FALSE.
                error_reporting() settings will have no effect and your error handler will be called regardless -
                however you are still able to read the current value of error_reporting and act appropriately.
                Of particular note is that this value will be 0 if the statement that caused the error was
                prepended by the @ error-control operator.

Smarty deliberately uses @filemtime() over file_exists() and filemtime() in some places. Reasons include
                - @filemtime() is almost twice as fast as using an additional file_exists()
                - between file_exists() and filemtime() a possible race condition is opened,
                  which does not exist using the simple @filemtime() approach.
        */
        $error_handler = array('Smarty', 'mutingErrorHandler');
        $previous = set_error_handler($error_handler);

// avoid dead loops
        if ($previous !== $error_handler) {
            Smarty::$_previous_error_handler = $previous;
        }
    }

/**
     * Disable error handler muting expected messages
     *
     * @return void
     */
    public static function unmuteExpectedErrors()
    {
        restore_error_handler();
    }
}

// Check if we're running on windows
Smarty::$_IS_WINDOWS = strtoupper(substr(PHP_OS, 0, 3)) === 'WIN';

// let PCRE (preg_*) treat strings as ISO-8859-1 if we're not dealing with UTF-8
if (Smarty::$_CHARSET !== 'UTF-8') {
    Smarty::$_UTF8_MODIFIER = '';
}

/**
 * Smarty exception class
 * @package Smarty
 */
class SmartyException extends Exception {
    public static $escape = true;
    public function __construct($message) {
        $this->message = self::$escape ? htmlentities($message) : $message;
    }
}

/**
 * Smarty compiler exception class
 * @package Smarty
 */
class SmartyCompilerException extends SmartyException  {
}

/**
 * Autoloader
 */
function smartyAutoload($class)
{
    $_class = strtolower($class);
    $_classes = array(
        'smarty_config_source' => true,
        'smarty_config_compiled' => true,
        'smarty_security' => true,
        'smarty_cacheresource' => true,
        'smarty_cacheresource_custom' => true,
        'smarty_cacheresource_keyvaluestore' => true,
        'smarty_resource' => true,
        'smarty_resource_custom' => true,
        'smarty_resource_uncompiled' => true,
        'smarty_resource_recompiled' => true,
    );

if (!strncmp($_class, 'smarty_internal_', 16) || isset($_classes[$_class])) {
        include SMARTY_SYSPLUGINS_DIR . $_class . '.php';
    }
}

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