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<?php
declare(strict_types=1);
namespace Money;
use InvalidArgumentException;
use JsonSerializable;
use function assert;
use function is_numeric;
use function preg_match;
use function sprintf;
/**
* Currency Pair holding a base, a counter currency and a conversion ratio.
*
* @see http://en.wikipedia.org/wiki/Currency_pair
*/
final class CurrencyPair implements JsonSerializable
{
/**
* Currency to convert from.
*/
private Currency $baseCurrency;
/**
* Currency to convert to.
*/
private Currency $counterCurrency;
/** @psalm-var numeric-string */
private string $conversionRatio;
/**
* @psalm-param numeric-string $conversionRatio
*/
public function __construct(Currency $baseCurrency, Currency $counterCurrency, string $conversionRatio)
{
$this->counterCurrency = $counterCurrency;
$this->baseCurrency = $baseCurrency;
$this->conversionRatio = $conversionRatio;
}
/**
* Creates a new Currency Pair based on "EUR/USD 1.2500" form representation.
*
* @param string $iso String representation of the form "EUR/USD 1.2500"
*
* @throws InvalidArgumentException Format of $iso is invalid.
*/
public static function createFromIso(string $iso): CurrencyPair
{
$currency = '([A-Z]{2,3})';
$ratio = '([0-9]*\.?[0-9]+)'; // @see http://www.regular-expressions.info/floatingpoint.html
$pattern = '#' . $currency . '/' . $currency . ' ' . $ratio . '#';
$matches = [];
if (! preg_match($pattern, $iso, $matches)) {
throw new InvalidArgumentException(sprintf('Cannot create currency pair from ISO string "%s", format of string is invalid', $iso));
}
assert($matches[1] !== '');
assert($matches[2] !== '');
assert(is_numeric($matches[3]));
return new self(new Currency($matches[1]), new Currency($matches[2]), $matches[3]);
}
/**
* Returns the counter currency.
*/
public function getCounterCurrency(): Currency
{
return $this->counterCurrency;
}
/**
* Returns the base currency.
*/
public function getBaseCurrency(): Currency
{
return $this->baseCurrency;
}
/**
* Returns the conversion ratio.
*
* @psalm-return numeric-string
*/
public function getConversionRatio(): string
{
return $this->conversionRatio;
}
/**
* Checks if an other CurrencyPair has the same parameters as this.
*/
public function equals(CurrencyPair $other): bool
{
return $this->baseCurrency->equals($other->baseCurrency)
&& $this->counterCurrency->equals($other->counterCurrency)
&& $this->conversionRatio === $other->conversionRatio;
}
/**
* {@inheritdoc}
*
* @psalm-return array{baseCurrency: Currency, counterCurrency: Currency, ratio: numeric-string}
*/
public function jsonSerialize(): array
{
return [
'baseCurrency' => $this->baseCurrency,
'counterCurrency' => $this->counterCurrency,
'ratio' => $this->conversionRatio,
];
}
}