public override SyntaxNode VisitInvocationExpression(InvocationExpressionSyntax node)
{
var exchangeName = node.Expression.ToString();
if (exchangeName.StartsWith("ERR_", StringComparison.OrdinalIgnoreCase))
{
Errors.Add(RateRulesErrors.PreprocessError);
return(base.VisitInvocationExpression(node));
}
var currencyPair = node.ArgumentList.ChildNodes().FirstOrDefault()?.ToString();
if (currencyPair == null || !CurrencyPair.TryParse(currencyPair, out var pair))
{
Errors.Add(RateRulesErrors.InvalidCurrencyIdentifier);
return(RateRules.CreateExpression($"ERR_INVALID_CURRENCY_PAIR({node.ToString()})"));
}
else
{
var rate = Rates.GetRate(exchangeName, pair);
if (rate == null)
{
Errors.Add(RateRulesErrors.RateUnavailable);
return(RateRules.CreateExpression($"ERR_RATE_UNAVAILABLE({exchangeName}, {pair.ToString()})"));
}
else
{
return(RateRules.CreateExpression(rate.ToString()));
}
}
}
public void AreAllRates()
{
//Arrange
Currency[] currencies = new Currency[] { Currency.AUD, Currency.CAD, Currency.CHF, Currency.EUR, Currency.GBP, Currency.JPY, Currency.USD };
ExchangeRates rates = new ExchangeRates();
string res = "";
decimal rate = 0;
//Act
for (int i = 0; i < currencies.Length; i++)
{
for (int j = 0; j < currencies.Length; j++)
{
try
{
rate = rates.GetRate(currencies[i], currencies[j]);
}
catch
{
res += currencies[i].ToString() + "-" + currencies[j].ToString() + "|";
}
if (i == j && rate != 1m)
{
res += currencies[i].ToString() + "-" + currencies[j].ToString() + "|";
}
}
}
//Assert
Assert.AreEqual("", res);
}
public void GetRate()
{
Assert.IsNotNull(exchangeRate.GetRate(1, "USD", "EUR"));
}