Proyectos de Subversion Moodle

Rev

| Ultima modificación | Ver Log |

Rev Autor Línea Nro. Línea
1 efrain 1 
<?php
2 
 
3 
/**
4 
 * Validates a number as defined by the CSS spec.
5 
 */
6 
class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
7 
{
8 
 
9 
    /**
10 
     * Indicates whether or not only positive values are allowed.
11 
     * @type bool
12 
     */
13 
    protected $non_negative = false;
14 
 
15 
    /**
16 
     * @param bool $non_negative indicates whether negatives are forbidden
17 
     */
18 
    public function __construct($non_negative = false)
19 
    {
20 
        $this->non_negative = $non_negative;
21 
    }
22 
 
23 
    /**
24 
     * @param string $number
25 
     * @param HTMLPurifier_Config $config
26 
     * @param HTMLPurifier_Context $context
27 
     * @return string|bool
28 
     * @warning Some contexts do not pass $config, $context. These
29 
     *          variables should not be used without checking HTMLPurifier_Length
30 
     */
31 
    public function validate($number, $config, $context)
32 
    {
33 
        $number = $this->parseCDATA($number);
34 
 
35 
        if ($number === '') {
36 
            return false;
37 
        }
38 
        if ($number === '0') {
39 
            return '0';
40 
        }
41 
 
42 
        $sign = '';
43 
        switch ($number[0]) {
44 
            case '-':
45 
                if ($this->non_negative) {
46 
                    return false;
47 
                }
48 
                $sign = '-';
49 
            case '+':
50 
                $number = substr($number, 1);
51 
        }
52 
 
53 
        if (ctype_digit($number)) {
54 
            $number = ltrim($number, '0');
55 
            return $number ? $sign . $number : '0';
56 
        }
57 
 
58 
        // Period is the only non-numeric character allowed
59 
        if (strpos($number, '.') === false) {
60 
            return false;
61 
        }
62 
 
63 
        list($left, $right) = explode('.', $number, 2);
64 
 
65 
        if ($left === '' && $right === '') {
66 
            return false;
67 
        }
68 
        if ($left !== '' && !ctype_digit($left)) {
69 
            return false;
70 
        }
71 
 
72 
        // Remove leading zeros until positive number or a zero stays left
73 
        if (ltrim($left, '0') != '') {
74 
            $left = ltrim($left, '0');
75 
        } else {
76 
            $left = '0';
77 
        }
78 
 
79 
        $right = rtrim($right, '0');
80 
 
81 
        if ($right === '') {
82 
            return $left ? $sign . $left : '0';
83 
        } elseif (!ctype_digit($right)) {
84 
            return false;
85 
        }
86 
        return $sign . $left . '.' . $right;
87 
    }
88 
}
89 
 
90 
// vim: et sw=4 sts=4