Re:Parsing Advances
by luizfelberti on Monday December 29, 2025 @11:16PM
(#46429476)
I also find this to be an elegant way of doing this, and it is also how the Thompson VM style of regex engines work [0]
It's a bit harder to adapt the technique to parsers because the Thompson NFA always increments the sequence pointer by the same amount, while a parser's production usually has a variable size, making it harder to run several parsing heads in lockstep.
It's a bit harder to adapt the technique to parsers because the Thompson NFA always increments the sequence pointer by the same amount, while a parser's production usually has a variable size, making it harder to run several parsing heads in lockstep.
[0] https://swtch.com/~rsc/regexp/regexp2.html