| 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: |