Implementing the string module via PEG

[ilyagr]

This is a bit of a drive-by question, but I'm curious: why are functions in the string module implemented as C functions as opposed to PEG? Would PEG be much slower?

For example, would the PEG version of string/split be readable? Would it be fast? It seems that I'd need to use something like that if I wanted to split a string by whitespace, as opposed to only on single spaces.

In fact, it seems to be a shame that the delimeter in string/split cannot be a PEG. If that's impractical, it might be nice to have a peg/split function, even if its implementation is relatively simple.

For the other functions, I think it could be didactic to write them as PEGs, and quite cool if the PEG functions would be as fast.

(I realized this might be answered in the Janet for Mortals book. I only looked at the docs before asking)

[sogaiu]

Re: peg/split

This was attempted once before, see here for details.