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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 { /** * Whether or not negative values are allowed. * @type bool */ protected $negative = true; /** * Whether or not zero is allowed. * @type bool */ protected $zero = true; /** * Whether or not positive values are allowed. * @type bool */ 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; } /** * @param string $integer * @param HTMLPurifier_Config $config * @param HTMLPurifier_Context $context * @return bool|string */ public function validate($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