/**
* Normalizes a hexadecimal HTML color value. All values will be converted
* to lowercase, have a "#" prepended and contain six characters.
*
* @param string hexadecimal HTML color value
* @return string
*/
public static function color($str = '')
{
// Reject invalid values
if (!valid::color($str)) {
return '';
}
// Convert to lowercase
$str = strtolower($str);
// Prepend "#"
if ($str[0] !== '#') {
$str = '#' . $str;
}
// Expand short notation
if (strlen($str) === 4) {
$str = '#' . $str[1] . $str[1] . $str[2] . $str[2] . $str[3] . $str[3];
}
return $str;
}
/**
* Tests the valid::color() function.
* @dataProvider color_provider
* @group core.helpers.valid.color
* @test
*/
public function color($input_color, $expected_result)
{
$result = valid::color($input_color);
$this->assertEquals($expected_result, $result);
}
