Re: Call a non-start production

[Panayiotis Karabassis]

Thank you for you response!

The problem is that I would like to select different start symbols at 
run-time.
For example to have a function

parse(start_symbol, string)

So that can I write unit tests like

ASSERT_PARSES_CORRECTLY(parse(EXPRESSION, "3+2=4"))

%start would set the start symbol once and for all for the generated parser.

But again thank you very much for your response.

Regards,
    Panayiotis

On 07/18/2010 07:47 PM, Hans Aberg wrote:
> On 18 Jul 2010, at 15:38, Panayiotis Karabassis wrote:
>
> > In my parser I have several productions. The start production is 
> > named "program". Further down I have a production named "expression" 
> > etc. For testing purposes I would like to parse a string using 
> > "expression" as the start production. Is this possible? My parser is 
> > a C++ parser.
>
> Perhaps you might try %start (see the Bison manual) and ignore any 
> messages about unreachable states.
>
>   Hans