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<?php |
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namespace BillingBoss\Interpreter; |
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use BillingBoss\AbstractBillInterpreter; |
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use BillingBoss\BillContext; |
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use BillingBoss\Expr; |
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use BillingBoss\RangeHelper; |
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/** |
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* Capped bill interpreter |
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* |
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* @package BillingBoss |
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* @link https://github.com/ranskills/billing-boss-php |
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* @copyright Copyright (c) 2018 Ransford Ako Okpoti |
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* @license Refer to the LICENSE distributed with this library |
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* @since 1.0.0 |
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*/ |
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final class CappedBillInterpreter extends AbstractBillInterpreter |
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{ |
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private const A = |
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Expr::PERCENT . |
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Expr::SPACES . |
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'\[' . |
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Expr::SPACES . |
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Expr::POSITIVE_NUMBER . |
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Expr::COMMA . |
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Expr::POSITIVE_NUMBER . |
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Expr::SPACES . |
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'\]' . |
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Expr::COMMA . |
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Expr::RANGE; |
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public function __construct() |
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{ |
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parent::__construct(sprintf('/^%1$s(%2$s%1$s)*$/', self::A, Expr::PIPE)); |
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} |
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private function enforceBoundaries($bill, $lowerLimit, $upperLimit) |
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{ |
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if ($bill > $upperLimit) { |
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$bill = $upperLimit; |
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} |
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if ($bill < $lowerLimit) { |
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$bill = $lowerLimit; |
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} |
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return $bill; |
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} |
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public function interpret(BillContext $context): float |
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{ |
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$bill = 0.0; |
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if (!$this->isValid($context)) { |
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return 0.0; |
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} |
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$parts = preg_split(sprintf('/%s/', Expr::PIPE), $context->getStructure()); |
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foreach ($parts as $part) { |
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$matches = []; |
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\preg_match(sprintf('/^%s$/', self::A), $part, $matches); |
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$percent = $matches[1]; |
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$capMin = $matches[2]; |
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$capMax = $matches[3]; |
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$rangeStart = $matches[4]; |
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$rangeEnd = $matches[5]; |
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$amount = $context->getAmount(); |
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if (RangeHelper::isInRange([$rangeStart, $rangeEnd], $amount)) { |
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$ctxt = new BillContext($amount, $percent . '%' . ', 1 - * '); |
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$bill = (new PercentageBillInterpreter())->interpret($ctxt); |
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$bill = $this->enforceBoundaries($bill, $capMin, $capMax); |
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break; |
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} |
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} |
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return $bill; |
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} |
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} |
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ranskills /
billing-boss-php
