Filter.php

<?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
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Filter.php 24593 2012-01-05 20:35:02Z matthew $
 */

/**
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';

/**
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @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'");
    }
}