<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Filter

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

/**

 * @see Zend_Filter_Interface

 */

require_once 'Zend/Filter/Interface.php';

/**

 * @category   Zend

 * @package    Zend_Filter

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Filter implements Zend_Filter_Interface

{

    const CHAIN_APPEND  = 'append';

    const CHAIN_PREPEND = 'prepend';

    /**

     * Filter chain

     *

     * @var array

     */

    protected $_filters = array();

    /**

     * Default Namespaces

     *

     * @var array

     */

    protected static $_defaultNamespaces = array();

    /**

     * Adds a filter to the chain

     *

     * @param  Zend_Filter_Interface $filter

     * @param  string $placement

     * @return Zend_Filter Provides a fluent interface

     */

    public function addFilter(Zend_Filter_Interface $filter, $placement = self::CHAIN_APPEND)

    {

        if ($placement == self::CHAIN_PREPEND) {

            array_unshift($this->_filters, $filter);

        } else {

            $this->_filters[] = $filter;

        }

        return $this;

    }

    /**

     * Add a filter to the end of the chain

     *

     * @param  Zend_Filter_Interface $filter

     * @return Zend_Filter Provides a fluent interface

     */

    public function appendFilter(Zend_Filter_Interface $filter)

    {

        return $this->addFilter($filter, self::CHAIN_APPEND);

    }

    /**

     * Add a filter to the start of the chain

     *

     * @param  Zend_Filter_Interface $filter

     * @return Zend_Filter Provides a fluent interface

     */

    public function prependFilter(Zend_Filter_Interface $filter)

    {

        return $this->addFilter($filter, self::CHAIN_PREPEND);

    }

    /**

     * Get all the filters

     *

     * @return array

     */

    public function getFilters()

    {

        return $this->_filters;

    }

    /**

     * Returns $value filtered through each filter in the chain

     *

     * Filters are run in the order in which they were added to the chain (FIFO)

     *

     * @param  mixed $value

     * @return mixed

     */

    public function filter($value)

    {

        $valueFiltered = $value;

        foreach ($this->_filters as $filter) {

            $valueFiltered = $filter->filter($valueFiltered);

        }

        return $valueFiltered;

    }

    /**

     * Returns the set default namespaces

     *

     * @return array

     */

    public static function getDefaultNamespaces()

    {

        return self::$_defaultNamespaces;

    }

    /**

     * Sets new default namespaces

     *

     * @param array|string $namespace

     * @return null

     */

    public static function setDefaultNamespaces($namespace)

    {

        if (!is_array($namespace)) {

            $namespace = array((string) $namespace);

        }

        self::$_defaultNamespaces = $namespace;

    }

    /**

     * Adds a new default namespace

     *

     * @param array|string $namespace

     * @return null

     */

    public static function addDefaultNamespaces($namespace)

    {

        if (!is_array($namespace)) {

            $namespace = array((string) $namespace);

        }

        self::$_defaultNamespaces = array_unique(array_merge(self::$_defaultNamespaces, $namespace));

    }

    /**

     * Returns true when defaultNamespaces are set

     *

     * @return boolean

     */

    public static function hasDefaultNamespaces()

    {

        return (!empty(self::$_defaultNamespaces));

    }

    /**

     * @deprecated

     * @see Zend_Filter::filterStatic()

     *

     * @param  mixed        $value

     * @param  string       $classBaseName

     * @param  array        $args          OPTIONAL

     * @param  array|string $namespaces    OPTIONAL

     * @return mixed

     * @throws Zend_Filter_Exception

     */

    public static function get($value, $classBaseName, array $args = array(), $namespaces = array())

    {

        trigger_error(

            'Zend_Filter::get() is deprecated as of 1.9.0; please update your code to utilize Zend_Filter::filterStatic()',

            E_USER_NOTICE

        );

        return self::filterStatic($value, $classBaseName, $args, $namespaces);

    }

    /**

     * Returns a value filtered through a specified filter class, without requiring separate

     * instantiation of the filter object.

     *

     * The first argument of this method is a data input value, that you would have filtered.

     * The second argument is a string, which corresponds to the basename of the filter class,

     * relative to the Zend_Filter namespace. This method automatically loads the class,

     * creates an instance, and applies the filter() method to the data input. You can also pass

     * an array of constructor arguments, if they are needed for the filter class.

     *

     * @param  mixed        $value

     * @param  string       $classBaseName

     * @param  array        $args          OPTIONAL

     * @param  array|string $namespaces    OPTIONAL

     * @return mixed

     * @throws Zend_Filter_Exception

     */

    public static function filterStatic($value, $classBaseName, array $args = array(), $namespaces = array())

    {

        require_once 'Zend/Loader.php';

        $namespaces = array_merge((array) $namespaces, self::$_defaultNamespaces, array('Zend_Filter'));

        foreach ($namespaces as $namespace) {

            $className = $namespace . '_' . ucfirst($classBaseName);

            if (!class_exists($className, false)) {

                try {

                    $file = str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';

                    if (Zend_Loader::isReadable($file)) {

                        Zend_Loader::loadClass($className);

                    } else {

                        continue;

                    }

                } catch (Zend_Exception $ze) {

                    continue;

                }

            }

            $class = new ReflectionClass($className);

            if ($class->implementsInterface('Zend_Filter_Interface')) {

                if ($class->hasMethod('__construct')) {

                    $object = $class->newInstanceArgs($args);

                } else {

                    $object = $class->newInstance();

                }

                return $object->filter($value);

            }

        }

        require_once 'Zend/Filter/Exception.php';

        throw new Zend_Filter_Exception("Filter class not found from basename '$classBaseName'");

    }

}