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