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<?php
/**
* Validates an integer.
* @note While this class was modeled off the CSS definition, no currently
* allowed CSS uses this type. The properties that do are: widows,
* orphans, z-index, counter-increment, counter-reset. Some of the
* HTML attributes, however, find use for a non-negative version of this.
*/
class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
{
/**
* Bool indicating whether or not negative values are allowed
*/
protected $negative = true;
/**
* Bool indicating whether or not zero is allowed
*/
protected $zero = true;
/**
* Bool indicating whether or not positive values are allowed
*/
protected $positive = true;
/**
* @param $negative Bool indicating whether or not negative values are allowed
* @param $zero Bool indicating whether or not zero is allowed
* @param $positive Bool indicating whether or not positive values are allowed
*/
public function __construct(
$negative = true, $zero = true, $positive = true
) {
$this->negative = $negative;
$this->zero = $zero;
$this->positive = $positive;
}
public function validate($integer, $config, $context) {
$integer = $this->parseCDATA($integer);
if ($integer === '') return false;
// we could possibly simply typecast it to integer, but there are
// certain fringe cases that must not return an integer.
// clip leading sign
if ( $this->negative && $integer[0] === '-' ) {
$digits = substr($integer, 1);
if ($digits === '0') $integer = '0'; // rm minus sign for zero
} elseif( $this->positive && $integer[0] === '+' ) {
$digits = $integer = substr($integer, 1); // rm unnecessary plus
} else {
$digits = $integer;
}
// test if it's numeric
if (!ctype_digit($digits)) return false;
// perform scope tests
if (!$this->zero && $integer == 0) return false;
if (!$this->positive && $integer > 0) return false;
if (!$this->negative && $integer < 0) return false;
return $integer;
}
}
// vim: et sw=4 sts=4
|
