/**
* Implements preg_replace_callback() callback.
*
* @see self::process()
*/
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];
}
