There are various modules which patch the BNF on the fly, as a way of 
combining parts of a grammar. See:

https://metacpan.org/pod/Text::Balanced::Marpa

https://metacpan.org/pod/Text::Delimited::Marpa

Also, in this list, http://savage.net.au/Marpa.html#Perl_Packages, J Durand 
has a number of modules, some of which likewise patch the BNF.

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