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<?php
/**
* Represents a pre or post processing filter on HTML Purifier's output
*
* Sometimes, a little ad-hoc fixing of HTML has to be done before
* it gets sent through HTML Purifier: you can use filters to acheive
* this effect. For instance, YouTube videos can be preserved using
* this manner. You could have used a decorator for this task, but
* PHP's support for them is not terribly robust, so we're going
* to just loop through the filters.
*
* Filters should be exited first in, last out. If there are three filters,
* named 1, 2 and 3, the order of execution should go 1->preFilter,
* 2->preFilter, 3->preFilter, purify, 3->postFilter, 2->postFilter,
* 1->postFilter.
*
* @note Methods are not declared abstract as it is perfectly legitimate
* for an implementation not to want anything to happen on a step
*/
class HTMLPurifier_Filter
{
/**
* Name of the filter for identification purposes.
* @type string
*/
public $name;
/**
* Pre-processor function, handles HTML before HTML Purifier
* @param string $html
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return string
*/
public function preFilter($html, $config, $context)
{
return $html;
}
/**
* Post-processor function, handles HTML after HTML Purifier
* @param string $html
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return string
*/
public function postFilter($html, $config, $context)
{
return $html;
}
}
// vim: et sw=4 sts=4