/**
* Operations have to be done per-channel, if not,
* channels will spill onto each other. Once we have
* our result, in the form of an integer triplet,
* we create a new color node to hold the result.
*
* @param ILess_Environment $env
* @param string $op
* @param ILess_Node $other
* @return ILess_Node_Color
* @throws InvalidArgumentException
*/
public function operate(ILess_Environment $env, $op, ILess_Node $other)
{
$result = array();
if (!$other instanceof ILess_Node_Color) {
if (!self::methodExists($other, 'toColor')) {
throw new InvalidArgumentException('The other node must implement toColor() method to operate');
}
$other = $other->toColor();
if (!$other instanceof ILess_Node_Color) {
throw new InvalidArgumentException('The toColor() method must return an instance of ILess_Node_Color');
}
}
$t = $this->getRGB();
$o = $other->getRGB();
for ($c = 0; $c < 3; $c++) {
$result[$c] = ILess_Math::operate($op, $t[$c], $o[$c]);
if ($result[$c] > 255) {
$result[$c] = 255;
} elseif ($result < 0) {
$result[$c] = 0;
}
}
return new ILess_Node_Color($result, $this->color->getAlpha() + $other->color->getAlpha());
}
/**
* Operates with the dimension. In an operation between two dimensions,
* we default to the first Dimension's unit,
* so `1px + 2` will yield `3px`.
*
* @param ILess_Environment $env
* @param string $op
* @param ILess_Node_Dimension $other
* @return ILess_Node_Dimension
* @throws ILess_CompilerException
*/
public function operate(ILess_Environment $env, $op, ILess_Node_Dimension $other)
{
$value = ILess_Math::operate($op, $this->value, $other->value);
$unit = clone $this->unit;
if ($op === '+' || $op === '-') {
if (!count($unit->numerator) && !count($unit->denominator)) {
$unit->numerator = $other->unit->numerator;
$unit->denominator = $other->unit->denominator;
} elseif (!count($other->unit->numerator) && !count($other->unit->denominator)) {
// do nothing
} else {
$other = $other->convertTo($this->unit->usedUnits());
if ($env->strictUnits && $other->unit->toString() !== $unit->toString()) {
throw new ILess_Exception_Compiler(sprintf('Incompatible units. Change the units or use the unit function. Bad units: \'%s\' and \'%s\'.', $unit->toString(), $other->unit->toString()));
}
$value = ILess_Math::operate($op, $this->value, $other->value);
}
} elseif ($op === '*') {
$unit->numerator = array_merge($unit->numerator, $other->unit->numerator);
$unit->denominator = array_merge($unit->denominator, $other->unit->denominator);
sort($unit->numerator);
sort($unit->denominator);
$unit->cancel();
} elseif ($op === '/') {
$unit->numerator = array_merge($unit->numerator, $other->unit->denominator);
$unit->denominator = array_merge($unit->denominator, $other->unit->numerator);
sort($unit->numerator);
sort($unit->denominator);
$unit->cancel();
}
return new ILess_Node_Dimension($value, $unit);
}
