Zend Framework教程-Zend_Helpers-视图助手-视图助手的实现原理

require_once 'Zend/View/Helper/Interface.php';/** * @category   Zend * @package    Zend_View * @subpackage Helper * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License */abstract class Zend_View_Helper_Abstract implements Zend_View_Helper_Interface{    /**     * View object     *     * @var Zend_View_Interface     */    public $view = null;    /**     * Set the View object     *     * @param  Zend_View_Interface $view     * @return Zend_View_Helper_Abstract     */    public function setView(Zend_View_Interface $view)    {        $this->view = $view;        return $this;    }    /**     * Strategy pattern: currently unutilized     *     * @return void     */    public function direct()    {    }}

interface Zend_View_Helper_Interface{    /**     * Set the View object     *     * @param  Zend_View_Interface $view     * @return Zend_View_Helper_Interface     */    public function setView(Zend_View_Interface $view);    /**     * Strategy pattern: helper method to invoke     *     * @return mixed     */    public function direct();}

/**     * getHelper() - get helper by name     *     * @param  string $name     * @return Zend_Controller_Action_Helper_Abstract     */    public function getHelper($name)    {        $name  = self::_normalizeHelperName($name);        $stack = self::getStack();        if (!isset($stack->{$name})) {            self::_loadHelper($name);        }        $helper = $stack->{$name};        $initialize = false;        if (null === ($actionController = $helper->getActionController())) {            $initialize = true;        } elseif ($actionController !== $this->_actionController) {            $initialize = true;        }        if ($initialize) {            $helper->setActionController($this->_actionController)                   ->init();        }        return $helper;    }    /**     * Method overloading     *     * @param  string $method     * @param  array $args     * @return mixed     * @throws Zend_Controller_Action_Exception if helper does not have a direct() method     */    public function __call($method, $args)    {        $helper = $this->getHelper($method);        if (!method_exists($helper, 'direct')) {            require_once 'Zend/Controller/Action/Exception.php';            throw new Zend_Controller_Action_Exception('Helper "' . $method . '" does not support overloading via direct()');        }        return call_user_func_array(array($helper, 'direct'), $args);    }

<?php /** @see Zend_Loader */require_once 'Zend/Loader.php';/** @see Zend_Loader_PluginLoader */require_once 'Zend/Loader/PluginLoader.php';/** @see Zend_View_Interface */require_once 'Zend/View/Interface.php';/** * Abstract class for Zend_View to help enforce private constructs. * * @category   Zend * @package    Zend_View * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License */abstract class Zend_View_Abstract implements Zend_View_Interface{    /**     * Path stack for script, helper, and filter directories.     *     * @var array     */    private $_path = array(        'script' => array(),        'helper' => array(),        'filter' => array(),    );    /**     * Script file name to execute     *     * @var string     */    private $_file = null;    /**     * Instances of helper objects.     *     * @var array     */    private $_helper = array();    /**     * Map of helper => class pairs to help in determining helper class from     * name     * @var array     */    private $_helperLoaded = array();    /**     * Map of helper => classfile pairs to aid in determining helper classfile     * @var array     */    private $_helperLoadedDir = array();    /**     * Stack of Zend_View_Filter names to apply as filters.     * @var array     */    private $_filter = array();    /**     * Stack of Zend_View_Filter objects that have been loaded     * @var array     */    private $_filterClass = array();    /**     * Map of filter => class pairs to help in determining filter class from     * name     * @var array     */    private $_filterLoaded = array();    /**     * Map of filter => classfile pairs to aid in determining filter classfile     * @var array     */    private $_filterLoadedDir = array();    /**     * Callback for escaping.     *     * @var string     */    private $_escape = 'htmlspecialchars';    /**     * Encoding to use in escaping mechanisms; defaults to utf-8     * @var string     */    private $_encoding = 'UTF-8';    /**     * Flag indicating whether or not LFI protection for rendering view scripts is enabled     * @var bool     */    private $_lfiProtectionOn = true;    /**     * Plugin loaders     * @var array     */    private $_loaders = array();    /**     * Plugin types     * @var array     */    private $_loaderTypes = array('filter', 'helper');    /**     * Strict variables flag; when on, undefined variables accessed in the view     * scripts will trigger notices     * @var boolean     */    private $_strictVars = false;    /**     * Constructor.     *     * @param array $config Configuration key-value pairs.     */    public function __construct($config = array())    {        // set inital paths and properties        $this->setScriptPath(null);        // $this->setHelperPath(null);        $this->setFilterPath(null);        // user-defined escaping callback        if (array_key_exists('escape', $config)) {            $this->setEscape($config['escape']);        }        // encoding        if (array_key_exists('encoding', $config)) {            $this->setEncoding($config['encoding']);        }        // base path        if (array_key_exists('basePath', $config)) {            $prefix = 'Zend_View';            if (array_key_exists('basePathPrefix', $config)) {                $prefix = $config['basePathPrefix'];            }            $this->setBasePath($config['basePath'], $prefix);        }        // user-defined view script path        if (array_key_exists('scriptPath', $config)) {            $this->addScriptPath($config['scriptPath']);        }        // user-defined helper path        if (array_key_exists('helperPath', $config)) {            if (is_array($config['helperPath'])) {                foreach ($config['helperPath'] as $prefix => $path) {                    $this->addHelperPath($path, $prefix);                }            } else {                $prefix = 'Zend_View_Helper';                if (array_key_exists('helperPathPrefix', $config)) {                    $prefix = $config['helperPathPrefix'];                }                $this->addHelperPath($config['helperPath'], $prefix);            }        }        // user-defined filter path        if (array_key_exists('filterPath', $config)) {            if (is_array($config['filterPath'])) {                foreach ($config['filterPath'] as $prefix => $path) {                    $this->addFilterPath($path, $prefix);                }            } else {                $prefix = 'Zend_View_Filter';                if (array_key_exists('filterPathPrefix', $config)) {                    $prefix = $config['filterPathPrefix'];                }                $this->addFilterPath($config['filterPath'], $prefix);            }        }        // user-defined filters        if (array_key_exists('filter', $config)) {            $this->addFilter($config['filter']);        }        // strict vars        if (array_key_exists('strictVars', $config)) {            $this->strictVars($config['strictVars']);        }        // LFI protection flag        if (array_key_exists('lfiProtectionOn', $config)) {            $this->setLfiProtection($config['lfiProtectionOn']);        }        $this->init();    }    /**     * Return the template engine object     *     * Returns the object instance, as it is its own template engine     *     * @return Zend_View_Abstract     */    public function getEngine()    {        return $this;    }    /**     * Allow custom object initialization when extending Zend_View_Abstract or     * Zend_View     *     * Triggered by {@link __construct() the constructor} as its final action.     *     * @return void     */    public function init()    {    }    /**     * Prevent E_NOTICE for nonexistent values     *     * If {@link strictVars()} is on, raises a notice.     *     * @param  string $key     * @return null     */    public function __get($key)    {        if ($this->_strictVars) {            trigger_error('Key "' . $key . '" does not exist', E_USER_NOTICE);        }        return null;    }    /**     * Allows testing with empty() and isset() to work inside     * templates.     *     * @param  string $key     * @return boolean     */    public function __isset($key)    {        if ('_' != substr($key, 0, 1)) {            return isset($this->$key);        }        return false;    }    /**     * Directly assigns a variable to the view script.     *     * Checks first to ensure that the caller is not attempting to set a     * protected or private member (by checking for a prefixed underscore); if     * not, the public member is set; otherwise, an exception is raised.     *     * @param string $key The variable name.     * @param mixed $val The variable value.     * @return void     * @throws Zend_View_Exception if an attempt to set a private or protected     * member is detected     */    public function __set($key, $val)    {        if ('_' != substr($key, 0, 1)) {            $this->$key = $val;            return;        }        require_once 'Zend/View/Exception.php';        $e = new Zend_View_Exception('Setting private or protected class members is not allowed');        $e->setView($this);        throw $e;    }    /**     * Allows unset() on object properties to work     *     * @param string $key     * @return void     */    public function __unset($key)    {        if ('_' != substr($key, 0, 1) && isset($this->$key)) {            unset($this->$key);        }    }    /**     * Accesses a helper object from within a script.     *     * If the helper class has a 'view' property, sets it with the current view     * object.     *     * @param string $name The helper name.     * @param array $args The parameters for the helper.     * @return string The result of the helper output.     */    public function __call($name, $args)    {        // is the helper already loaded?        $helper = $this->getHelper($name);        // call the helper method        return call_user_func_array(            array($helper, $name),            $args        );    }    /**     * Given a base path, sets the script, helper, and filter paths relative to it     *     * Assumes a directory structure of:     * <code>     * basePath/     *     scripts/     *     helpers/     *     filters/     * </code>     *     * @param  string $path     * @param  string $prefix Prefix to use for helper and filter paths     * @return Zend_View_Abstract     */    public function setBasePath($path, $classPrefix = 'Zend_View')    {        $path        = rtrim($path, '/');        $path        = rtrim($path, '');        $path       .= DIRECTORY_SEPARATOR;        $classPrefix = rtrim($classPrefix, '_') . '_';        $this->setScriptPath($path . 'scripts');        $this->setHelperPath($path . 'helpers', $classPrefix . 'Helper');        $this->setFilterPath($path . 'filters', $classPrefix . 'Filter');        return $this;    }    /**     * Given a base path, add script, helper, and filter paths relative to it     *     * Assumes a directory structure of:     * <code>     * basePath/     *     scripts/     *     helpers/     *     filters/     * </code>     *     * @param  string $path     * @param  string $prefix Prefix to use for helper and filter paths     * @return Zend_View_Abstract     */    public function addBasePath($path, $classPrefix = 'Zend_View')    {        $path        = rtrim($path, '/');        $path        = rtrim($path, '');        $path       .= DIRECTORY_SEPARATOR;        $classPrefix = rtrim($classPrefix, '_') . '_';        $this->addScriptPath($path . 'scripts');        $this->addHelperPath($path . 'helpers', $classPrefix . 'Helper');        $this->addFilterPath($path . 'filters', $classPrefix . 'Filter');        return $this;    }    /**     * Adds to the stack of view script paths in LIFO order.     *     * @param string|array The directory (-ies) to add.     * @return Zend_View_Abstract     */    public function addScriptPath($path)    {        $this->_addPath('script', $path);        return $this;    }    /**     * Resets the stack of view script paths.     *     * To clear all paths, use Zend_View::setScriptPath(null).     *     * @param string|array The directory (-ies) to set as the path.     * @return Zend_View_Abstract     */    public function setScriptPath($path)    {        $this->_path['script'] = array();        $this->_addPath('script', $path);        return $this;    }    /**     * Return full path to a view script specified by $name     *     * @param  string $name     * @return false|string False if script not found     * @throws Zend_View_Exception if no script directory set     */    public function getScriptPath($name)    {        try {            $path = $this->_script($name);            return $path;        } catch (Zend_View_Exception $e) {            if (strstr($e->getMessage(), 'no view script directory set')) {                throw $e;            }            return false;        }    }    /**     * Returns an array of all currently set script paths     *     * @return array     */    public function getScriptPaths()    {        return $this->_getPaths('script');    }    /**     * Set plugin loader for a particular plugin type     *     * @param  Zend_Loader_PluginLoader $loader     * @param  string $type     * @return Zend_View_Abstract     */    public function setPluginLoader(Zend_Loader_PluginLoader $loader, $type)    {        $type = strtolower($type);        if (!in_array($type, $this->_loaderTypes)) {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception(sprintf('Invalid plugin loader type "%s"', $type));            $e->setView($this);            throw $e;        }        $this->_loaders[$type] = $loader;        return $this;    }    /**     * Retrieve plugin loader for a specific plugin type     *     * @param  string $type     * @return Zend_Loader_PluginLoader     */    public function getPluginLoader($type)    {        $type = strtolower($type);        if (!in_array($type, $this->_loaderTypes)) {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception(sprintf('Invalid plugin loader type "%s"; cannot retrieve', $type));            $e->setView($this);            throw $e;        }        if (!array_key_exists($type, $this->_loaders)) {            $prefix     = 'Zend_View_';            $pathPrefix = 'Zend/View/';            $pType = ucfirst($type);            switch ($type) {                case 'filter':                case 'helper':                default:                    $prefix     .= $pType;                    $pathPrefix .= $pType;                    $loader = new Zend_Loader_PluginLoader(array(                        $prefix => $pathPrefix                    ));                    $this->_loaders[$type] = $loader;                    break;            }        }        return $this->_loaders[$type];    }    /**     * Adds to the stack of helper paths in LIFO order.     *     * @param string|array The directory (-ies) to add.     * @param string $classPrefix Class prefix to use with classes in this     * directory; defaults to Zend_View_Helper     * @return Zend_View_Abstract     */    public function addHelperPath($path, $classPrefix = 'Zend_View_Helper_')    {        return $this->_addPluginPath('helper', $classPrefix, (array) $path);    }    /**     * Resets the stack of helper paths.     *     * To clear all paths, use Zend_View::setHelperPath(null).     *     * @param string|array $path The directory (-ies) to set as the path.     * @param string $classPrefix The class prefix to apply to all elements in     * $path; defaults to Zend_View_Helper     * @return Zend_View_Abstract     */    public function setHelperPath($path, $classPrefix = 'Zend_View_Helper_')    {        unset($this->_loaders['helper']);        return $this->addHelperPath($path, $classPrefix);    }    /**     * Get full path to a helper class file specified by $name     *     * @param  string $name     * @return string|false False on failure, path on success     */    public function getHelperPath($name)    {        return $this->_getPluginPath('helper', $name);    }    /**     * Returns an array of all currently set helper paths     *     * @return array     */    public function getHelperPaths()    {        return $this->getPluginLoader('helper')->getPaths();    }    /**     * Registers a helper object, bypassing plugin loader     *     * @param  Zend_View_Helper_Abstract|object $helper     * @param  string $name     * @return Zend_View_Abstract     * @throws Zend_View_Exception     */    public function registerHelper($helper, $name)    {        if (!is_object($helper)) {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception('View helper must be an object');            $e->setView($this);            throw $e;        }        if (!$helper instanceof Zend_View_Interface) {            if (!method_exists($helper, $name)) {                require_once 'Zend/View/Exception.php';                $e =  new Zend_View_Exception(                    'View helper must implement Zend_View_Interface or have a method matching the name provided'                );                $e->setView($this);                throw $e;            }        }        if (method_exists($helper, 'setView')) {            $helper->setView($this);        }        $name = ucfirst($name);        $this->_helper[$name] = $helper;        return $this;    }    /**     * Get a helper by name     *     * @param  string $name     * @return object     */    public function getHelper($name)    {        return $this->_getPlugin('helper', $name);    }    /**     * Get array of all active helpers     *     * Only returns those that have already been instantiated.     *     * @return array     */    public function getHelpers()    {        return $this->_helper;    }    /**     * Adds to the stack of filter paths in LIFO order.     *     * @param string|array The directory (-ies) to add.     * @param string $classPrefix Class prefix to use with classes in this     * directory; defaults to Zend_View_Filter     * @return Zend_View_Abstract     */    public function addFilterPath($path, $classPrefix = 'Zend_View_Filter_')    {        return $this->_addPluginPath('filter', $classPrefix, (array) $path);    }    /**     * Resets the stack of filter paths.     *     * To clear all paths, use Zend_View::setFilterPath(null).     *     * @param string|array The directory (-ies) to set as the path.     * @param string $classPrefix The class prefix to apply to all elements in     * $path; defaults to Zend_View_Filter     * @return Zend_View_Abstract     */    public function setFilterPath($path, $classPrefix = 'Zend_View_Filter_')    {        unset($this->_loaders['filter']);        return $this->addFilterPath($path, $classPrefix);    }    /**     * Get full path to a filter class file specified by $name     *     * @param  string $name     * @return string|false False on failure, path on success     */    public function getFilterPath($name)    {        return $this->_getPluginPath('filter', $name);    }    /**     * Get a filter object by name     *     * @param  string $name     * @return object     */    public function getFilter($name)    {        return $this->_getPlugin('filter', $name);    }    /**     * Return array of all currently active filters     *     * Only returns those that have already been instantiated.     *     * @return array     */    public function getFilters()    {        return $this->_filter;    }    /**     * Returns an array of all currently set filter paths     *     * @return array     */    public function getFilterPaths()    {        return $this->getPluginLoader('filter')->getPaths();    }    /**     * Return associative array of path types => paths     *     * @return array     */    public function getAllPaths()    {        $paths = $this->_path;        $paths['helper'] = $this->getHelperPaths();        $paths['filter'] = $this->getFilterPaths();        return $paths;    }    /**     * Add one or more filters to the stack in FIFO order.     *     * @param string|array One or more filters to add.     * @return Zend_View_Abstract     */    public function addFilter($name)    {        foreach ((array) $name as $val) {            $this->_filter[] = $val;        }        return $this;    }    /**     * Resets the filter stack.     *     * To clear all filters, use Zend_View::setFilter(null).     *     * @param string|array One or more filters to set.     * @return Zend_View_Abstract     */    public function setFilter($name)    {        $this->_filter = array();        $this->addFilter($name);        return $this;    }    /**     * Sets the _escape() callback.     *     * @param mixed $spec The callback for _escape() to use.     * @return Zend_View_Abstract     */    public function setEscape($spec)    {        $this->_escape = $spec;        return $this;    }    /**     * Set LFI protection flag     *     * @param  bool $flag     * @return Zend_View_Abstract     */    public function setLfiProtection($flag)    {        $this->_lfiProtectionOn = (bool) $flag;        return $this;    }    /**     * Return status of LFI protection flag     *     * @return bool     */    public function isLfiProtectionOn()    {        return $this->_lfiProtectionOn;    }    /**     * Assigns variables to the view script via differing strategies.     *     * Zend_View::assign('name', $value) assigns a variable called 'name'     * with the corresponding $value.     *     * Zend_View::assign($array) assigns the array keys as variable     * names (with the corresponding array values).     *     * @see    __set()     * @param  string|array The assignment strategy to use.     * @param  mixed (Optional) If assigning a named variable, use this     * as the value.     * @return Zend_View_Abstract Fluent interface     * @throws Zend_View_Exception if $spec is neither a string nor an array,     * or if an attempt to set a private or protected member is detected     */    public function assign($spec, $value = null)    {        // which strategy to use?        if (is_string($spec)) {            // assign by name and value            if ('_' == substr($spec, 0, 1)) {                require_once 'Zend/View/Exception.php';                $e = new Zend_View_Exception('Setting private or protected class members is not allowed');                $e->setView($this);                throw $e;            }            $this->$spec = $value;        } elseif (is_array($spec)) {            // assign from associative array            $error = false;            foreach ($spec as $key => $val) {                if ('_' == substr($key, 0, 1)) {                    $error = true;                    break;                }                $this->$key = $val;            }            if ($error) {                require_once 'Zend/View/Exception.php';                $e = new Zend_View_Exception('Setting private or protected class members is not allowed');                $e->setView($this);                throw $e;            }        } else {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception('assign() expects a string or array, received ' . gettype($spec));            $e->setView($this);            throw $e;        }        return $this;    }    /**     * Return list of all assigned variables     *     * Returns all public properties of the object. Reflection is not used     * here as testing reflection properties for visibility is buggy.     *     * @return array     */    public function getVars()    {        $vars   = get_object_vars($this);        foreach ($vars as $key => $value) {            if ('_' == substr($key, 0, 1)) {                unset($vars[$key]);            }        }        return $vars;    }    /**     * Clear all assigned variables     *     * Clears all variables assigned to Zend_View either via {@link assign()} or     * property overloading ({@link __set()}).     *     * @return void     */    public function clearVars()    {        $vars   = get_object_vars($this);        foreach ($vars as $key => $value) {            if ('_' != substr($key, 0, 1)) {                unset($this->$key);            }        }    }    /**     * Processes a view script and returns the output.     *     * @param string $name The script name to process.     * @return string The script output.     */    public function render($name)    {        // find the script file name using the parent private method        $this->_file = $this->_script($name);        unset($name); // remove $name from local scope        ob_start();        $this->_run($this->_file);        return $this->_filter(ob_get_clean()); // filter output    }    /**     * Escapes a value for output in a view script.     *     * If escaping mechanism is one of htmlspecialchars or htmlentities, uses     * {@link $_encoding} setting.     *     * @param mixed $var The output to escape.     * @return mixed The escaped value.     */    public function escape($var)    {        if (in_array($this->_escape, array('htmlspecialchars', 'htmlentities'))) {            return call_user_func($this->_escape, $var, ENT_COMPAT, $this->_encoding);        }        return call_user_func($this->_escape, $var);    }    /**     * Set encoding to use with htmlentities() and htmlspecialchars()     *     * @param string $encoding     * @return Zend_View_Abstract     */    public function setEncoding($encoding)    {        $this->_encoding = $encoding;        return $this;    }    /**     * Return current escape encoding     *     * @return string     */    public function getEncoding()    {        return $this->_encoding;    }    /**     * Enable or disable strict vars     *     * If strict variables are enabled, {@link __get()} will raise a notice     * when a variable is not defined.     *     * Use in conjunction with {@link Zend_View_Helper_DeclareVars the declareVars() helper}     * to enforce strict variable handling in your view scripts.     *     * @param  boolean $flag     * @return Zend_View_Abstract     */    public function strictVars($flag = true)    {        $this->_strictVars = ($flag) ? true : false;        return $this;    }    /**     * Finds a view script from the available directories.     *     * @param $name string The base name of the script.     * @return void     */    protected function _script($name)    {        if ($this->isLfiProtectionOn() && preg_match('#..[/]#', $name)) {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception('Requested scripts may not include parent directory traversal ("../", ".." notation)');            $e->setView($this);            throw $e;        }        if (0 == count($this->_path['script'])) {            require_once 'Zend/View/Exception.php';            $e = new Zend_View_Exception('no view script directory set; unable to determine location for view script');            $e->setView($this);            throw $e;        }        foreach ($this->_path['script'] as $dir) {            if (is_readable($dir . $name)) {                return $dir . $name;            }        }        require_once 'Zend/View/Exception.php';        $message = "script '$name' not found in path ("                 . implode(PATH_SEPARATOR, $this->_path['script'])                 . ")";        $e = new Zend_View_Exception($message);        $e->setView($this);        throw $e;    }    /**     * Applies the filter callback to a buffer.     *     * @param string $buffer The buffer contents.     * @return string The filtered buffer.     */    private function _filter($buffer)    {        // loop through each filter class        foreach ($this->_filter as $name) {            // load and apply the filter class            $filter = $this->getFilter($name);            $buffer = call_user_func(array($filter, 'filter'), $buffer);        }        // done!        return $buffer;    }    /**     * Adds paths to the path stack in LIFO order.     *     * Zend_View::_addPath($type, 'dirname') adds one directory     * to the path stack.     *     * Zend_View::_addPath($type, $array) adds one directory for     * each array element value.     *     * In the case of filter and helper paths, $prefix should be used to     * specify what class prefix to use with the given path.     *     * @param string $type The path type ('script', 'helper', or 'filter').     * @param string|array $path The path specification.     * @param string $prefix Class prefix to use with path (helpers and filters     * only)     * @return void     */    private function _addPath($type, $path, $prefix = null)    {        foreach ((array) $path as $dir) {            // attempt to strip any possible separator and            // append the system directory separator            $dir  = rtrim($dir, '/');            $dir  = rtrim($dir, '');            $dir .= '/';            switch ($type) {                case 'script':                    // add to the top of the stack.                    array_unshift($this->_path[$type], $dir);                    break;                case 'filter':                case 'helper':                default:                    // add as array with prefix and dir keys                    array_unshift($this->_path[$type], array('prefix' => $prefix, 'dir' => $dir));                    break;            }        }    }    /**     * Resets the path stack for helpers and filters.     *     * @param string $type The path type ('helper' or 'filter').     * @param string|array $path The directory (-ies) to set as the path.     * @param string $classPrefix Class prefix to apply to elements of $path     */    private function _setPath($type, $path, $classPrefix = null)    {        $dir = DIRECTORY_SEPARATOR . ucfirst($type) . DIRECTORY_SEPARATOR;        switch ($type) {            case 'script':                $this->_path[$type] = array(dirname(__FILE__) . $dir);                $this->_addPath($type, $path);                break;            case 'filter':            case 'helper':            default:                $this->_path[$type] = array(array(                    'prefix' => 'Zend_View_' . ucfirst($type) . '_',                    'dir'    => dirname(__FILE__) . $dir                ));                $this->_addPath($type, $path, $classPrefix);                break;        }    }    /**     * Return all paths for a given path type     *     * @param string $type The path type  ('helper', 'filter', 'script')     * @return array     */    private function _getPaths($type)    {        return $this->_path[$type];    }    /**     * Register helper class as loaded     *     * @param  string $name     * @param  string $class     * @param  string $file path to class file     * @return void     */    private function _setHelperClass($name, $class, $file)    {        $this->_helperLoadedDir[$name] = $file;        $this->_helperLoaded[$name]    = $class;    }    /**     * Register filter class as loaded     *     * @param  string $name     * @param  string $class     * @param  string $file path to class file     * @return void     */    private function _setFilterClass($name, $class, $file)    {        $this->_filterLoadedDir[$name] = $file;        $this->_filterLoaded[$name]    = $class;    }    /**     * Add a prefixPath for a plugin type     *     * @param  string $type     * @param  string $classPrefix     * @param  array $paths     * @return Zend_View_Abstract     */    private function _addPluginPath($type, $classPrefix, array $paths)    {        $loader = $this->getPluginLoader($type);        foreach ($paths as $path) {            $loader->addPrefixPath($classPrefix, $path);        }        return $this;    }    /**     * Get a path to a given plugin class of a given type     *     * @param  string $type     * @param  string $name     * @return string|false     */    private function _getPluginPath($type, $name)    {        $loader = $this->getPluginLoader($type);        if ($loader->isLoaded($name)) {            return $loader->getClassPath($name);        }        try {            $loader->load($name);            return $loader->getClassPath($name);        } catch (Zend_Loader_Exception $e) {            return false;        }    }    /**     * Retrieve a plugin object     *     * @param  string $type     * @param  string $name     * @return object     */    private function _getPlugin($type, $name)    {        $name = ucfirst($name);        switch ($type) {            case 'filter':                $storeVar = '_filterClass';                $store    = $this->_filterClass;                break;            case 'helper':                $storeVar = '_helper';                $store    = $this->_helper;                break;        }        if (!isset($store[$name])) {            $class = $this->getPluginLoader($type)->load($name);            $store[$name] = new $class();            if (method_exists($store[$name], 'setView')) {                $store[$name]->setView($this);            }        }        $this->$storeVar = $store;        return $store[$name];    }    /**     * Use to include the view script in a scope that only allows public     * members.     *     * @return mixed     */    abstract protected function _run();}

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