Here is another example of an LR parser that reads the grammar on the fly and immediately parses the input (which is, among other things, also defining its own grammar) with it: https://marketplace.visualstudio.com/items?itemName=Practal....

But it seems the LR approach is just not flexible enough for my needs, so I am experimenting with replacing it with parser combinators + Earley parsing. The LR approach has also the disadvantage of having to precompute tables, which is fine for a single file, but if you want to deal with modules, then I am not sure how to compute these tables incrementally, which is kind of a prerequisite for a good user experience.