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1<?php
2
3/**
4 * Represents a pre or post processing filter on HTML Purifier's output
5 *
6 * Sometimes, a little ad-hoc fixing of HTML has to be done before
7 * it gets sent through HTML Purifier: you can use filters to acheive
8 * this effect. For instance, YouTube videos can be preserved using
9 * this manner. You could have used a decorator for this task, but
10 * PHP's support for them is not terribly robust, so we're going
11 * to just loop through the filters.
12 *
13 * Filters should be exited first in, last out. If there are three filters,
14 * named 1, 2 and 3, the order of execution should go 1->preFilter,
15 * 2->preFilter, 3->preFilter, purify, 3->postFilter, 2->postFilter,
16 * 1->postFilter.
17 *
18 * @note Methods are not declared abstract as it is perfectly legitimate
19 * for an implementation not to want anything to happen on a step
20 */
21
22class HTMLPurifier_Filter
23{
24
25 /**
26 * Name of the filter for identification purposes.
27 * @type string
28 */
29 public $name;
30
31 /**
32 * Pre-processor function, handles HTML before HTML Purifier
33 * @param string $html
34 * @param HTMLPurifier_Config $config
35 * @param HTMLPurifier_Context $context
36 * @return string
37 */
38 public function preFilter($html, $config, $context)
39 {
40 return $html;
41 }
42
43 /**
44 * Post-processor function, handles HTML after HTML Purifier
45 * @param string $html
46 * @param HTMLPurifier_Config $config
47 * @param HTMLPurifier_Context $context
48 * @return string
49 */
50 public function postFilter($html, $config, $context)
51 {
52 return $html;
53 }
54}
55
56// vim: et sw=4 sts=4