Intermediate resolve variables before final result

[ole1986]

Does there exist any intermediate option to resolve the variables by the given parameters brefore the final result? For Example I have

var parsedAmount = interpreter.Parse("x * y  + 2", parameters);

And I would like to have the result before the final result returned. E.g.

"4 * 5  + 2"

My current workaround is to do a string replacement, like so:

var expr = "x * y + 2";
var parsedAmount = interpreter.Parse(expr, parameters);;

parsedAmount.UsedParameters.ToList().ForEach(x =>
                                    {
                                        expr = expr .Replace(x.Name, x.Name + $" [{x.Value}]");
                                    });

[davideicardi]

Interesting idea, something like a "linking" phase ... But no, for now I don't think it is possible. As usual contributions are welcome!

[holdenmai]

My idea seems pretty limited in scope, but based on this request it would be possible to add in a ParameterInterceptor style functionality. The end user would receive the ParameterExpression, its current value, and if we wanted they could return the value or a different value (this could give them the means to do some extra validation inline).

var expr = "x * y + 2";

var target = new Interpreter();
var updatedText = expr;
target.ParameterInterceptor += (Parameter expression, int? textIndex, object currentValue) =>
{
updatedText = updatedText.Replace(expression.Name, currentValue?.ToString());
return currentValue;
};
var parsedAmount = interpreter.Parse(expr, parameters);
parsedAmount.Invoke(parameters);

It's a pretty limited example that would need a LOT more code on the end user's side if parameter names were used multiple times, but it would give the flexibility needed to see exactly what is being ran.