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1: <?php
2:
3: /**
4: * Validates an integer.
5: * @note While this class was modeled off the CSS definition, no currently
6: * allowed CSS uses this type. The properties that do are: widows,
7: * orphans, z-index, counter-increment, counter-reset. Some of the
8: * HTML attributes, however, find use for a non-negative version of this.
9: */
10: class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
11: {
12:
13: /**
14: * Whether or not negative values are allowed.
15: * @type bool
16: */
17: protected $negative = true;
18:
19: /**
20: * Whether or not zero is allowed.
21: * @type bool
22: */
23: protected $zero = true;
24:
25: /**
26: * Whether or not positive values are allowed.
27: * @type bool
28: */
29: protected $positive = true;
30:
31: /**
32: * @param $negative Bool indicating whether or not negative values are allowed
33: * @param $zero Bool indicating whether or not zero is allowed
34: * @param $positive Bool indicating whether or not positive values are allowed
35: */
36: public function __construct($negative = true, $zero = true, $positive = true)
37: {
38: $this->negative = $negative;
39: $this->zero = $zero;
40: $this->positive = $positive;
41: }
42:
43: /**
44: * @param string $integer
45: * @param HTMLPurifier_Config $config
46: * @param HTMLPurifier_Context $context
47: * @return bool|string
48: */
49: public function validate($integer, $config, $context)
50: {
51: $integer = $this->parseCDATA($integer);
52: if ($integer === '') {
53: return false;
54: }
55:
56: // we could possibly simply typecast it to integer, but there are
57: // certain fringe cases that must not return an integer.
58:
59: // clip leading sign
60: if ($this->negative && $integer[0] === '-') {
61: $digits = substr($integer, 1);
62: if ($digits === '0') {
63: $integer = '0';
64: } // rm minus sign for zero
65: } elseif ($this->positive && $integer[0] === '+') {
66: $digits = $integer = substr($integer, 1); // rm unnecessary plus
67: } else {
68: $digits = $integer;
69: }
70:
71: // test if it's numeric
72: if (!ctype_digit($digits)) {
73: return false;
74: }
75:
76: // perform scope tests
77: if (!$this->zero && $integer == 0) {
78: return false;
79: }
80: if (!$this->positive && $integer > 0) {
81: return false;
82: }
83: if (!$this->negative && $integer < 0) {
84: return false;
85: }
86:
87: return $integer;
88: }
89: }
90:
91: // vim: et sw=4 sts=4
92:
API documentation generated by ApiGen v7.0.0-alpha.6