Honestly, I’m not at all acquainted with NimbleParsec, or any other available parsers for Elixir - I would have to dive into the alternatives to see how they would compare. One of the strengths of XPeg would be the concise way to build ASTs directly from the grammar, but other parsers might as well offer the same functionality. Performance is currently not great, as there is a number of possible optimizations that I have not yet implemented.
I initially wrote XPeg as an exercise to acquainted with Elixir metaprogramming, the implementation itself is basically a Elixir port of a (pretty much mature) Nim parser I made a a few years ago: NPeg, which is itself based on Lua’s LPeg.
