[antlr-interest] [SPAM] Re: [SPAM] [SPAM] Optional expression rule alternative

[Olivier Lefevre]

Great! Not to abuse but would you know in which section of
"The Definitive ANTLR Reference" this mentioned? I couldn't
find it. What is this syntax called?

But in my real-world problem it was actually not a choice
between rule1 and rule2 but a question of whether to allow
an extra alternative in the z case without too much
verbatim repetition, i.e. (again in pseudo-code):

rule[boolean z] :
   rule1 | rule2 | ... | rule23 | (z ? rule24 : nothing) ;

That is, allow rule24 if z otherwise stop at rule23.

Thanks again,

-- O.L.