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<?php |
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/** |
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* PHP Billing Library |
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* |
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* @link https://github.com/hiqdev/php-billing |
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* @package php-billing |
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* @license BSD-3-Clause |
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* @copyright Copyright (c) 2017-2018, HiQDev (http://hiqdev.com/) |
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*/ |
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namespace hiqdev\php\billing\formula; |
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use hiqdev\php\billing\charge\ChargeModifier; |
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use hiqdev\php\billing\charge\modifiers\Discount; |
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use Hoa\Ruler\Context; |
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use Hoa\Ruler\Ruler; |
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/** |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class FormulaEngine |
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{ |
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protected $ruler; |
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protected $asserter; |
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protected $context; |
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protected $discount; |
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public function __construct() |
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{ |
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if (!class_exists(Context::class)) { |
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throw new \Exception('to use formula engine install `hoa/ruler`'); |
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} |
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} |
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/** |
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* @param string $formula |
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* @return ChargeModifier |
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*/ |
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public function build(string $formula): ChargeModifier |
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{ |
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return $this->getRuler()->assert($formula, $this->getContext()); |
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} |
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public function getRuler() |
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{ |
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if ($this->ruler === null) { |
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$this->ruler = new Ruler(); |
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$this->ruler->setAsserter($this->getAsserter()); |
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} |
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return $this->ruler; |
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} |
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public function getAsserter() |
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{ |
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if ($this->asserter === null) { |
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$this->asserter = new Asserter(); |
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} |
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return $this->asserter; |
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} |
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public function getContext() |
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{ |
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if ($this->context === null) { |
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$this->context = $this->buildContext(); |
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} |
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return $this->context; |
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} |
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protected function buildContext() |
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{ |
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$context = new Context(); |
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$context['discount'] = $this->getDiscount(); |
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return $context; |
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} |
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public function getDiscount() |
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{ |
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if ($this->discount === null) { |
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$this->discount = new Discount(); |
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} |
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return $this->discount; |
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} |
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} |
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hiqdev /
php-billing
