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Re: [bpfk] selma'o ZEhEI and PEG



On Sat, Apr 25, 2015 at 1:37 PM, Alex Burka <durka42@gmail.com> wrote:
I tried to do this (delete ZEI, add {zei} and {ze'ei} to SI, and move SI from post_clause to pre_clause) but I was unable to complete the last step without introducing left recursion into the pre_clause rule. So it seems easier said than done. I am not an expert in these dark corners of the PEG, though.

Yes, the magic words section is quite tricky. I think what you need is to also replace pre_zei_bu with something like:

pre_zei_bu: (BRIVLA / !BU !ZEI !SI !SA !SU !FAhO CMAVO) spaces?

(or a list of all si-erasable selmaho, if you want to be able to identify the selmaho of the erased/modifier words).
 
The left recursion occurs because the current pre_zei_bu is calling pre_clause, which now calls pre_zei_bu, which calls pre_clause, which calls pre_zei_bu, which calls pre_clause, and so on...

You also need to remove SA_clause from si_clause for the same reason. I heven't bothered to think what it should be replaced with, since I'd like SA out of the grammar altogether, but it probably should be some sort of sa_clause_no_pre added to erasable_clause.

mu'o mi'e xorxes

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