Re: Issue 935 in lilypond: Enhancement: optional arguments in music functions

[lilypond]

Updates:
        Status: Started
        Owner: address@hidden
        Cc: address@hidden
        Labels: -Priority-Postponed Patch-review

Comment #3 on issue 935 by address@hidden: Enhancement: optional arguments in  
music functions
http://code.google.com/p/lilypond/issues/detail?id=935

Anyway, this was interesting, and I hope that it's bounty-worthy.  It is  
conceivable that one can notice slight speed differences: while Bison's  
speed is strict O(n) for input of size n, the tables grow with the number  
of states and that makes cache misses more likely.  But then that's not  
exactly the slowest part of Lilypond, so impact should be small.  It is  
more of a nuisance that the grammar does not exactly become more readable,  
but I have no good idea for somehow factoring the "anything but x" pattern  
required here for every supported argument type x.  Not without making  
things even more complex.

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