[bpfk] Fighting copy-pasting in PEG

[Gleki Arxokuna <gleki.is.my.name@gmail.com>]

I notice that a lot of combinations are "hardcoded" in PEG.

E.g. a lot of constructs are followed by "free*" several times in the grammar where the first part of the construct remains the same.

Here is an experimental grammar:

https://raw.githubusercontent.com/Ilmen-vodhr/ilmentufa/master/camxes-exp.js.peg

And here are the stats:

http://pastebin.com/raw.php?i=ADTJ0KdT

Here, "KE_clause free*" is used 11 times in PEG and even when "free*" doesn't follow KE_clause it could.

Why not move "free*" into KE_clause itself ? This would make the grammar easier.

"free*" is used ~200 times in the grammar. I'm sure this number can be lowered significantly.

Anyone is interested in joining such constructs into new variables?

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