Re: for loops in C style

[Ilyes Gouta]

Hi!

Thanks for your help.

If I setup a new fexpr (and a new fassignment) that would accept
nothing or expression, i.e:

fexpr:
    | expr;

for_stmt:
    for (fassignment; fexpr; fassignment) block

How can I define an action that would be triggered only for the empty
expressions? (I have to differentiate between the two cases since they
won't have a common action)

The only meaningful way, I found on the net to handle this, is this one:
http://www.cs.uaf.edu/2007/fall/cs631/Cyacc.y

Basically what it's done is enumerating all the possibilities for the
construction of the for loop. Is it the only way do things clearly and
properly?

Best regards,
Ilyes Gouta.

On Thu, Feb 28, 2008 at 9:59 PM, Hans Aberg <address@hidden> wrote:
> On 28 Feb 2008, at 15:16, Ilyes Gouta wrote:
>
>  > I'm writing a small grammar for a very simplified C language. My goal
>  > is to produce an AST once a script file is parsed by the flex/bison
>  > tools. I got almost everything working nicely, except for the C style
>  > for loops.
>  ...
>
> >  How one would modify the grammar to take into
>  > account such a scenario?
>  >
>  > Any ideas?
>
>  There is a Yaccable grammar of C++ - you might check that out
>    http://www.parashift.com/c++-faq-lite/compiler-
>  dependencies.html#faq-38.11
>
>    Hans Aberg
>
>
>