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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

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