cyve / rule-engine
Rule Engine service
Installs: 11 908
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Requires
- php: ^7.1|^8.0
- symfony/expression-language: ^3.4|^4.0|^5.0
README
Installation:
With Composer:
composer require cyve/rule-engine
Usage
use Cyve\RuleEngine\Engine\RuleEngine; use Cyve\RuleEngine\Rule\ExpressionRule; $engine = new RuleEngine([new ExpressionRule('subject * context["quantity"]')]); $price = $engine->handle(100, ['quantity' => 2]); // 200
Use case: price calculator (for Symfony)
// src/Price/Rule/QuantityRule.php namespace App\Price\Rule; class QuantityRule { public function __invoke($subject, array $context = []) { return $subject * $context['quantity'] ?? 1; } }
// src/Price/Rule/PromoCodeRule.php namespace App\Price\Rule; class PromoCodeRule implements \Cyve\RuleEngine\Rule\RuleInterface { public function supports($subject, array $context = []): bool { return isset($context['promoCode']); } public function handle($subject, array $context = []) { switch($context['promoCode']){ case '10_PERCENT': return $subject * .9; default: return $subject; } } }
// src/Price/PriceCalculator.php namespace App\Price; class PriceCalculator extends \Cyve\RuleEngine\Engine\RuleEngine {}
# config/service.yml # @see https://symfony.com/doc/4.4/service_container/tags.html#reference-tagged-services App\Price\Rule\: resource: '../src/Price/Rule/*' tags: ['price.rule'] App\Price\PriceCalculator: public: true arguments: - !tagged_iterator price.rule
// src/Controller/DefaultController.php ... public function priceAction() { $unitPrice = 100; $calculator = $this->get(PriceCalculator::class); $price = $calculator->handle($unitPrice, ['quantity' => 2, 'promoCode' => '10_PERCENT'])); // 180 } ...