Callback from parser

[rogerl50]

I want to parse a string that is generated inside a class instance by calling a peggy generated parser. One of the parsing actions needs to invoke a function defined inside the class instance, so that I have access to the environment of that instance, including this. How can I make that happen?

[Mingun]

Pass a class instance via options:

let parser = peggy.generate(...);

parser.parse(input, { myClass });
// in the code block in the grammar:
options.myClass.<...>