public override object VisitUnaryExpression([NotNull] PigeonParser.UnaryExpressionContext context)
{
var operand = Visit(context.expr());
var resType = analyser.Types.Get(context);
switch (context.op.Text)
{
case "+":
if (resType == PigeonType.Int)
{
return((int)operand);
}
return((float)operand);
case "-":
if (resType == PigeonType.Int)
{
return(-(int)operand);
}
return(-(float)operand);
case "!":
return(!(bool)operand);
default:
throw new InternalErrorException($"Unsupported unary operator {context.op.Text}");
}
}
public override void ExitUnaryExpression([NotNull] PigeonParser.UnaryExpressionContext context)
{
var operandType = Types.Get(context.expr());
if (!UnaryOperator.TryGetResType(context.op.Text, operandType, out var type))
{
errorBag.ReportInvalidTypeUnaryOperator(context.op.GetTextSpan(), context.op.Text, type);
}
Types.Put(context, type);
}
