Re: Lpeg 0.12: "grammar has too many rules"

[Sean Conner <sean@...>]

It was thus said that the Great Roberto Ierusalimschy once stated:
> > I'm looking for an email parser for lua, and came across Sean Conner's work [1]
> > Trying to run it with Lpeg 0.12 you get a failure:
> >     bad argument #1 to '?' (grammar has too many rules)
> > 
> > It used to work with Lpeg 0.10 [2], what new limits has Lpeg 0.12 brought along?
> 
> LPeg 0.12 has a constant MAXRULES, which is currently defined as 200. Just
> change that to a larger number and recompile LPeg. (And tell me how many
> rules you need.)

  I counted 212.  I set MAXRULES to 220 and it didn't complain:

[spc]lucy:~/source/parse/Lua>lua email.lua 
[spc]lucy:~/source/parse/Lua>

  So that's good.  But the code uses the 0.10.2 re syntax for table
captures---I thought 0.12 supports it but I can't find exactly where it
states that.

  Maybe bump MAXRULES to 250 or 300?

> (I thought 200 would be huge, but looking at your example 200 looks really
> humble :)

  You almost guess right 8-)

  -spc