1<?php
2
3/**
4 * Validates the HTML type length (not to be confused with CSS's length).
5 *
6 * This accepts integer pixels or percentages as lengths for certain
7 * HTML attributes.
8 */
9
10class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
11{
12
13    /**
14     * @param string $string
15     * @param HTMLPurifier_Config $config
16     * @param HTMLPurifier_Context $context
17     * @return bool|string
18     */
19    public function validate($string, $config, $context)
20    {
21        $string = trim($string);
22        if ($string === '') {
23            return false;
24        }
25
26        $parent_result = parent::validate($string, $config, $context);
27        if ($parent_result !== false) {
28            return $parent_result;
29        }
30
31        $length = strlen($string);
32        $last_char = $string[$length - 1];
33
34        if ($last_char !== '%') {
35            return false;
36        }
37
38        $points = substr($string, 0, $length - 1);
39
40        if (!is_numeric($points)) {
41            return false;
42        }
43
44        $points = (int)$points;
45
46        if ($points < 0) {
47            return '0%';
48        }
49        if ($points > 100) {
50            return '100%';
51        }
52        return ((string)$points) . '%';
53    }
54}
55
56// vim: et sw=4 sts=4
57