public override object VisitExpression(CurrencyComputerParser.ExpressionContext context)
{
var amounts = context.amountComposite();
var left = (AmountSigned)VisitAmountComposite(amounts[0]);
var leftConverted = ConvertTo(left, _targetCurrency);
var right = amounts.Length == 2
? (AmountSigned)VisitAmountComposite(amounts[1])
: (AmountSigned)VisitExpression(context.expression());
var rightConverted = ConvertTo(right, _targetCurrency);
var operationKey = $"{leftConverted.Sign}{rightConverted.Sign}";
var resultComputed = Operations[operationKey](leftConverted.Amount.Value, rightConverted.Amount.Value);
return(new AmountSigned
{
Sign = resultComputed < 0
? "-"
: "+",
Amount = new Amount
{
Currency = _targetCurrency,
Value = Math.Abs(resultComputed)
}
});
}
public override object VisitExpression(CurrencyComputerParser.ExpressionContext context)
{
var amounts = context.amountComposite();
var left = (AmountSigned)VisitAmountComposite(amounts[0]);
var leftConverted = ConvertTo(left, _targetCurrency);
if (leftConverted != left)
{
_logger?.LogDebug("{OperationNumber}:Converted from {Source} to {Dest}.", _operationsLogger++, left, leftConverted);
}
var right = amounts.Length == 2
? (AmountSigned)VisitAmountComposite(amounts[1])
: (AmountSigned)VisitExpression(context.expression());
var rightConverted = ConvertTo(right, _targetCurrency);
if (rightConverted != right)
{
_logger?.LogDebug("{OperationNumber}:Converted from {Source} to {Dest}.", _operationsLogger++, right, rightConverted);
}
var operationKey = $"{leftConverted.Sign}{rightConverted.Sign}";
var resultComputed = Operations[operationKey](leftConverted.Amount.Value, rightConverted.Amount.Value);
var result = new AmountSigned
{
Sign = resultComputed < 0
? "-"
: "+",
Amount = new Amount
{
Currency = _targetCurrency,
Value = Math.Abs(resultComputed)
}
};
_logger?.LogDebug("{OperationNumber}:Result {Result} from left {Left} and right {Right} tokens.", _operationsLogger++, result, leftConverted, rightConverted);
return(result);
}
/// <summary>
/// Visit a parse tree produced by <see cref="CurrencyComputerParser.expression"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitExpression([NotNull] CurrencyComputerParser.ExpressionContext context)
{
return(VisitChildren(context));
}
