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<?php

/**

* Validates a number as defined by the CSS spec.

class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef

{

/**

* Indicates whether or not only positive values are allowed.

* @type bool

protected $non_negative = false;

/**

* @param bool $non_negative indicates whether negatives are forbidden

public function __construct($non_negative = false)

{

$this->non_negative = $non_negative;

}

/**

* @param string $number

* @param HTMLPurifier_Config $config

* @param HTMLPurifier_Context $context

* @return string|bool

* @warning Some contexts do not pass $config, $context. These

*          variables should not be used without checking HTMLPurifier_Length

public function validate($number, $config, $context)

{

$number = $this->parseCDATA($number);

if ($number === '') {

return false;

}

if ($number === '0') {

return '0';

}

$sign = '';

switch ($number[0]) {

case '-':

if ($this->non_negative) {

return false;

}

$sign = '-';

case '+':

$number = substr($number, 1);

}

if (ctype_digit($number)) {

$number = ltrim($number, '0');

return $number ? $sign . $number : '0';

}

// Period is the only non-numeric character allowed

if (strpos($number, '.') === false) {

return false;

}

list($left, $right) = explode('.', $number, 2);

if ($left === '' && $right === '') {

return false;

}

if ($left !== '' && !ctype_digit($left)) {

return false;

}

$left = ltrim($left, '0');

$right = rtrim($right, '0');

if ($right === '') {

return $left ? $sign . $left : '0';

} elseif (!ctype_digit($right)) {

return false;

}

return $sign . $left . '.' . $right;

}

// vim: et sw=4 sts=4

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