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<?php
/**
* @package Joomla.Platform
* @subpackage Form
*
* @copyright Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/

defined('JPATH_PLATFORM') or die;

/**
* Form Rule class for the Joomla Platform.
*
* @package Joomla.Platform
* @subpackage Form
* @since 11.2
*/
class JFormRuleColor extends JFormRule
{
/**
* Method to test for a valid color in hexadecimal.
*
* @param SimpleXMLElement $element The SimpleXMLElement object representing the <field /> tag for the form field object.
* @param mixed $value The form field value to validate.
* @param string $group The field name group control value. This acts as as an array container for the field.
* For example if the field has name="foo" and the group value is set to "bar" then the
* full field name would end up being "bar[foo]".
* @param JRegistry $input An optional JRegistry object with the entire data set to validate against the entire form.
* @param JForm $form The form object for which the field is being tested.
*
* @return boolean True if the value is valid, false otherwise.
*
* @since 11.2
*/
public function test(SimpleXMLElement $element, $value, $group = null, JRegistry $input = null, JForm $form = null)
{
$value = trim($value);

if (empty($value))
{
// A color field can't be empty, we default to black. This is the same as the HTML5 spec.
$value = '#000000';
return true;
}

if ($value[0] != '#')
{
return false;
}

// Remove the leading # if present to validate the numeric part
$value = ltrim($value, '#');

// The value must be 6 or 3 characters long
if (!((strlen($value) == 6 || strlen($value) == 3) && ctype_xdigit($value)))
{
return false;
}

// Prepend the # again
$value = '#' . $value;

return true;
}
}
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