public override void Evaluate(TemplateContext context)
{
switch (Operator)
{
case ScriptUnaryOperator.Not:
{
var value = context.Evaluate(Right);
context.Result = !ScriptValueConverter.ToBool(value);
}
break;
case ScriptUnaryOperator.Negate:
case ScriptUnaryOperator.Plus:
{
var value = context.Evaluate(Right);
bool negate = Operator == ScriptUnaryOperator.Negate;
var customType = value as IScriptCustomType;
if (customType != null)
{
context.Result = customType.EvaluateUnaryExpression(this);
}
else if (value != null)
{
if (value is int)
{
context.Result = negate ? -((int) value) : value;
}
else if (value is double)
{
context.Result = negate ? -((double) value) : value;
}
else if (value is float)
{
context.Result = negate ? -((float) value) : value;
}
else if (value is long)
{
context.Result = negate ? -((long) value) : value;
}
else
{
throw new ScriptRuntimeException(this.Span,
$"Unexpected value [{value} / Type: {value?.GetType()}]. Cannot negate(-)/positive(+) a non-numeric value");
}
}
}
break;
case ScriptUnaryOperator.FunctionAlias:
context.Result = context.Evaluate(Right, true);
break;
case ScriptUnaryOperator.FunctionParametersExpand:
// Function parameters expand is done at the function level, so here, we simply return the actual list
Right?.Evaluate(context);
break;
default:
throw new ScriptRuntimeException(Span, $"Operator [{Operator}] is not supported");
}
}
}
