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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 hiqdev\php\billing\charge\modifiers\Leasing; |
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use Hoa\Ruler\Context; |
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use Hoa\Ruler\Model; |
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use Hoa\Ruler\Ruler; |
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use Hoa\Visitor\Visit; |
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/** |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class FormulaEngine implements FormulaEngineInterface |
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{ |
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/** |
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* @var Ruler |
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*/ |
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protected $ruler; |
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/** |
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* @var Visit|Asserter |
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*/ |
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protected $asserter; |
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/** |
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* @var Context |
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*/ |
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protected $context; |
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/** |
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* @var ChargeModifier |
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*/ |
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protected $discount; |
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/** |
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* @var ChargeModifier |
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*/ |
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protected $leasing; |
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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 $formula): ChargeModifier |
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{ |
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try { |
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$model = $this->interpret($formula); |
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$result = $this->getRuler()->assert($model, $this->getContext()); |
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} catch (FormulaEngineException $e) { |
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throw $e; |
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} catch (\Hoa\Ruler\Exception\Asserter $e) { |
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throw FormulaRuntimeError::fromException($e, $formula); |
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} catch (\Exception $exception) { |
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throw FormulaRuntimeError::create($formula, 'Formula run failed'); |
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} |
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if (!$result instanceof ChargeModifier) { |
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throw FormulaRuntimeError::create($formula, 'Formula run returned unexpected result'); |
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} |
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return $result; |
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} |
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/** |
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* @param string $formula |
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* @throws |
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* @return Model\Model |
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*/ |
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public function interpret(string $formula): Model\Model |
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{ |
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try { |
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$rule = str_replace("\n", ' AND ', $this->normalize($formula)); |
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return $this->getRuler()->interpret($rule); |
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} catch (\Hoa\Compiler\Exception\Exception $exception) { |
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throw FormulaSyntaxError::fromException($exception, $formula); |
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} catch (\Hoa\Ruler\Exception\Interpreter $exception) { |
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throw FormulaSyntaxError::fromException($exception, $formula); |
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} catch (\Throwable $exception) { |
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throw FormulaSyntaxError::create($formula, 'Failed to interpret formula'); |
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} |
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} |
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public function normalize(string $formula): ?string |
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{ |
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$lines = explode("\n", $formula); |
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$normalized = array_map(function ($value) { |
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$value = trim($value); |
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if (strlen($value) === 0) { |
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return null; |
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} |
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return $value; |
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}, $lines); |
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$cleared = array_filter($normalized); |
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return empty($cleared) ? null : implode("\n", $cleared); |
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} |
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/** |
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* Validates $formula. |
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* |
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* @param string $formula |
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* @return null|string `null` when formula has no errors or string error message |
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*/ |
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public function validate(string $formula): ?string |
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{ |
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try { |
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$this->build($formula); |
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return null; |
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} catch (FormulaEngineException $e) { |
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return $e->getMessage(); |
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} |
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} |
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public function getRuler(): Ruler |
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{ |
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if ($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 $this->ruler; |
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} |
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public function getAsserter(): Visit |
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{ |
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if ($this->asserter === null) { |
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$this->asserter = new Asserter(); |
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} |
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return $this->asserter; |
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} |
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public function getContext(): Context |
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{ |
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if ($this->context === null) { |
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$this->context = $this->buildContext(); |
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} |
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return $this->context; |
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} |
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protected function buildContext(): Context |
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{ |
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$context = new Context(); |
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$context['discount'] = $this->getDiscount(); |
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$context['leasing'] = $this->getLeasing(); |
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return $context; |
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} |
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public function getDiscount(): ChargeModifier |
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{ |
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if ($this->discount === null) { |
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$this->discount = new Discount(); |
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} |
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return $this->discount; |
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} |
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public function getLeasing(): ChargeModifier |
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{ |
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if ($this->leasing === null) { |
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$this->leasing = new Leasing(); |
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} |
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return $this->leasing; |
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} |
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} |
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hiqdev /
php-billing
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