On Monday, 15 August 2022 at 22:55:30 UTC, TheZipCreator wrote:
So I've looked at the [pegged
library](https://github.com/PhilippeSigaud/Pegged) and used it
a little bit and it seems really good. But there doesn't seem
like there's a built-in way to get line numbers of nodes in the
parse tree (or maybe I'm missing something). This would useful
because if an error occurs during interpreting/compiling, you
could give the user a line number where their error occurred by
just getting the line number of the node that's currently being
processed. Is there a way to do this in pegged?
It looks like the parse tree in pegged stores the start and end
byte indices of the portion of the input text it corresponds to:
https://github.com/PhilippeSigaud/Pegged/blob/v0.4.6/pegged/peg.d#L251-L252
It should be possible to compute line numbers based on these
indices.
