public override VariableValue Evaluate(IVariableStore variables)
{
var left = Left.Evaluate(variables);
var value = VariableHandler.Cast(left, _rightIdentifier.Name);
if (value.IsEmpty)
{
throw new ExpressionEvaluationException(_invalidCastException, left, _rightIdentifier.Name);
}
if (!value.IsEmpty && !left.HasReference)
{
if (Left is IAssignableOperation assignable)
{
var result = assignable.SetValue(variables, value);
if (result == SetVariableResult.Success)
{
return(value);
}
}
throw new ExpressionEvaluationException(_invalidAssignException, value, left, Left);
}
return(value);
}
public VariableValue GetValue(IVariableStore variables, VariableValue owner)
{
var left = Left is ILookupOperation lookup?lookup.GetValue(variables, owner) : VariableValue.Empty;
return(left.IsEmpty ? left : VariableHandler.Cast(left, _rightIdentifier.Name));
}