Is there a way to pass parameters to custom types?

Question

I would like to make a custom type that represents a fixed-point number with a variable binary scaling. Ideally, I'd like to make a custom type that I can input a parameter in to for that scaling factor. Is such a thing possible?

Answer 1

So you want to provide for each usage in the Grammar a parameter to the script of the custom type?
And the parameter doesn't depend on any other element parsed previously?

Comments

That's correct! The specific use-case I have is that a protocol stores several values as fixed-point numbers with various lengths of the fractional part. The code to parse them all is identical except for scaling the value by a variable part. I would like to avoid copy and pasting the same code a ridiculous number of times while changing 1 value. My current hacky solution is to parse the field as a raw number and then follow it with a Script element that just takes the raw value from the previous result and does the parsing and replaces that result.

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I have a similarly hacky solution in my grammar: I use the description field to specify which structure a script element should map. I wish there were an official solution.