/**
* Return a color 10% points *darker*
*
* @param ILess_Node $color
* @param ILess_Node
* @return string
* @throws InvalidArgumentException If the node is invalid
*/
public function darken(ILess_Node $color, ILess_Node_Dimension $percentage = null)
{
// this is a keyword
if ($color instanceof ILess_Node_Keyword && ILess_Color::isNamedColor($color->value)) {
$color = new ILess_Node_Color(ILess_Color::color($color->value));
}
if (!$color instanceof ILess_Node_Color) {
throw new InvalidArgumentException('Cannot darken the color. Invalid color given.');
}
$percentage = $percentage ? $percentage->value / 100 : 10;
$lightness = $this->clamp($color->getLightness(true) - $percentage);
return $this->hsla($color->getHue(true), $color->getSaturation(true), $lightness, $color->getAlpha(true));
}
/**
* Creates new color from the keyword
*
* @param string $keyword
* @return ILess_Color
*/
public static function fromKeyword($keyword)
{
$color = null;
// is this named color?
if (self::isNamedColor($keyword)) {
$color = new ILess_Color(substr(ILess_Color::color($keyword), 1));
$color->keyword = $keyword;
} elseif ($keyword === 'transparent') {
$color = new ILess_Color(array(255, 255, 255), 0);
$color->isTransparentKeyword = true;
}
return $color;
}
