/**
* @param ExpressionResult $value
*
* @throws SyntaxException
* @return ExpressionResult
*/
public function subtract(ExpressionResult $value)
{
if (!$this->isModifier()) {
/** @var Carbon $dateValue */
$dateValue = $this->getValue();
switch ($this->getVariableType()) {
case DateModifierInterface::VAR_NOW:
case DateModifierInterface::VAR_TODAY:
case DateModifierInterface::VAR_THIS_DAY:
case DateModifierInterface::VAR_SOW:
case DateModifierInterface::VAR_SOM:
case DateModifierInterface::VAR_SOQ:
case DateModifierInterface::VAR_SOY:
case DateModifierInterface::VAR_FDQ:
$dateValue->subDays($value->getValue());
break;
case DateModifierInterface::VAR_THIS_WEEK:
$dateValue->subWeeks($value->getValue());
break;
case DateModifierInterface::VAR_FMQ:
case DateModifierInterface::VAR_THIS_MONTH:
$dateValue->subMonths($value->getValue());
break;
case DateModifierInterface::VAR_THIS_QUARTER:
$dateValue->month(($dateValue->quarter - $value->getValue()) * 3);
break;
case DateModifierInterface::VAR_THIS_YEAR:
$dateValue->subYears($value->getValue());
break;
default:
throw new ExpressionDenied($this->getVariableLabel());
break;
}
} elseif (!$value->isModifier()) {
switch ($value->getVariableType()) {
case DateModifierInterface::VAR_NOW:
case DateModifierInterface::VAR_TODAY:
case DateModifierInterface::VAR_THIS_DAY:
case DateModifierInterface::VAR_SOW:
case DateModifierInterface::VAR_SOM:
case DateModifierInterface::VAR_SOQ:
case DateModifierInterface::VAR_SOY:
case DateModifierInterface::VAR_FDQ:
$this->value -= $value->getValue()->day;
break;
case DateModifierInterface::VAR_THIS_WEEK:
$this->value -= $value->getValue()->format('W');
break;
case DateModifierInterface::VAR_FMQ:
case DateModifierInterface::VAR_THIS_MONTH:
$this->value -= $value->getValue()->month;
break;
case DateModifierInterface::VAR_THIS_QUARTER:
$this->value -= $value->getValue()->quarter;
break;
case DateModifierInterface::VAR_THIS_YEAR:
$this->value -= $value->getValue()->year;
break;
default:
throw new ExpressionDenied($value->getVariableLabel());
break;
}
} else {
$this->value -= $value->getValue();
}
return $this;
}
