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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\charge\modifiers\addons; |
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use DateTimeImmutable; |
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use hiqdev\php\billing\charge\modifiers\AddonInterface; |
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use hiqdev\php\billing\formula\FormulaSemanticsError; |
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/** |
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* Period addon. |
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* |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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abstract class Period implements AddonInterface |
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{ |
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/** |
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* @var int |
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*/ |
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protected $value; |
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public function __construct($value) |
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{ |
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$this->value = static::ensureValidValue($value); |
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} |
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abstract public function countPeriodsPassed(DateTimeImmutable $since, DateTimeImmutable $time): float; |
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public function getValue() |
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{ |
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return $this->value; |
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} |
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protected static $periods = [ |
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'month' => MonthPeriod::class, |
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'months' => MonthPeriod::class, |
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'year' => YearPeriod::class, |
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'years' => YearPeriod::class, |
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]; |
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public static function fromString($string) |
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{ |
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if (preg_match('/^((\d+) +)?(\w+)$/', trim($string), $ms)) { |
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if (isset(static::$periods[$ms[3]])) { |
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$class = static::$periods[$ms[3]]; |
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return new $class($ms[1] ?: 1); |
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} |
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} |
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throw new FormulaSemanticsError("invalid period given: $string"); |
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} |
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public static function ensureValidValue($value) |
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{ |
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if (filter_var($value, FILTER_VALIDATE_INT) === false) { |
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throw new FormulaSemanticsError('periodicity must be integer number'); |
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} |
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return (int) $value; |
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} |
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} |
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hiqdev /
php-billing
