Re: experimental features in Bison 2.3a+

[Hans Aberg]

On 2 Dec 2006, at 06:23, Paul Eggert wrote:

> > 2. The prologue alternatives: %code, %requires, %provides, and % 
> > code-top.
>
> Yes.  Though to be honest I can't even remember what all of them are
> for....

In addition to those code-placement, there are a couple more  
potential for C++, which I cannot tell right off if they will be  
useful without experimentation. An in addition to those locations,  
for various purposes, not specifically C++, people wanted to be able  
to insert code in various places in the parser.

So it seemed me important to supply a mechanism by which those things  
could be done by merely changing the skeleton file, without having to  
tweak the Bison sources directly or hoping that the developers would  
eventually add this or that feature. That last might then be done,  
when a particular use has benn found to be sufficiently standard.

Or so, was my idea with %code. I am not sure what the idea is to now  
add a much more lmited variation of that command - evidently it is  
not in 2.3.a.

  Hans Aberg