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<?php declare(strict_types=1);
namespace hiqdev\php\billing\formula;
use hiqdev\php\billing\formula\FormulaEngine;
use hiqdev\php\billing\formula\FormulaEngineException;
class Formula
{
public function __construct(private ?string $value, private readonly FormulaEngine $formulaEngine)
if (!empty($this->value)) {
$this->value = $this->formulaEngine->normalize($this->value);
$this->validate($this->value);
}
private function validate(string $value): void
$error = $this->formulaEngine->validate($value);
if ($error !== null) {
throw new FormulaEngineException($error);
public function value(): ?string
return $this->value;
hiqdev /
php-billing
