Viewing file:  CryptoCurrencies.php (2.44 KB) -rw-r--r--
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<?php
declare(strict_types=1);
namespace Money\Currencies;
use ArrayIterator;
use Money\Currencies;
use Money\Currency;
use Money\Exception\UnknownCurrencyException;
use RuntimeException;
use Traversable;
use function array_keys;
use function array_map;
use function is_file;
/**
* List of supported Crypto Currencies codes and names using Binance as resource.
*/
final class CryptoCurrencies implements Currencies
{
/**
* Map of known currencies indexed by code.
*
* @psalm-var non-empty-array<non-empty-string, array{
* symbol: non-empty-string,
* minorUnit: positive-int|0
* }>|null
*/
private static ?array $currencies = null;
public function contains(Currency $currency): bool
{
return isset($this->getCurrencies()[$currency->getCode()]);
}
public function subunitFor(Currency $currency): int
{
if (! $this->contains($currency)) {
throw new UnknownCurrencyException('Cannot find ISO currency ' . $currency->getCode());
}
return $this->getCurrencies()[$currency->getCode()]['minorUnit'];
}
/**
* @psalm-return Traversable<int, Currency>
*/
public function getIterator(): Traversable
{
return new ArrayIterator(
array_map(
static function ($code) {
return new Currency($code);
},
array_keys($this->getCurrencies())
)
);
}
/**
* Returns a map of known currencies indexed by code.
*
* @psalm-return non-empty-array<non-empty-string, array{
* symbol: non-empty-string,
* minorUnit: positive-int|0
* }>
*/
private function getCurrencies(): array
{
if (self::$currencies === null) {
self::$currencies = $this->loadCurrencies();
}
return self::$currencies;
}
/**
* @psalm-return non-empty-array<non-empty-string, array{
* symbol: non-empty-string,
* minorUnit: positive-int|0
* }>
*
* @psalm-suppress MoreSpecificReturnType do not specify all keys and values
*/
private function loadCurrencies(): array
{
$file = __DIR__ . '/../../resources/binance.php';
if (is_file($file)) {
/** @psalm-suppress LessSpecificReturnStatement */
return require $file;
}
throw new RuntimeException('Failed to load currency ISO codes.');
}
}
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