I wrote about it at length here: https://www.nhatcher.com/post/a-rustic-invitation-to-parsing/ https://www.nhatcher.com/post/a-rustic-invitation-to-parsing...

I wrote about it at length here: https://www.nhatcher.com/post/a-rustic-invitation-to-parsing/ https://www.nhatcher.com/post/a-rustic-invitation-to-parsing... The implementation in IronCalc follows that.