function CurrencyExchange::processCallback in Currency 8.3

Implements preg_replace_callback() callback.

See also

self::process()

File

src/Plugin/Filter/CurrencyExchange.php, line 93

Class

CurrencyExchange

Provides a filter to exchange currencies.

Namespace

Drupal\currency\Plugin\Filter

Code

function processCallback(array $matches) {
  $currency_code_from = $matches[1];
  $currency_code_to = $matches[2];
  $amount = str_replace(':', '', $matches[3]);
  if (strlen($amount) !== 0) {
    $amount = $this->input
      ->parseAmount($amount);

    // The amount is invalid, so return the token.
    if (!$amount) {
      return $matches[0];
    }
  }
  else {
    $amount = 1;
  }
  $exchange_rate = $this->exchangeRateProvider
    ->load($currency_code_from, $currency_code_to);
  $this->currentFilterProcessResult
    ->addCacheableDependency($exchange_rate);
  if ($exchange_rate) {
    return bcmul($amount, $exchange_rate
      ->getRate(), 6);
  }

  // No exchange rate could be loaded, so return the token.
  return $matches[0];
}