Re: Printing PEG structure

On Sun, Mar 14, 2010 at 7:41 PM, Joel de Guzman
<[email protected]> wrote:
> On 3/14/2010 11:39 AM, OvermindDL1 wrote:
>> I am curious.  I know that the grammar for Spirit generates a kind of
>> bytecode at compile time that the parse functions can go over to do
>> the actual parsing (again, optimized at compile time).  I am curious,
>> would it be possible to create such a function that goes over that
>> bytecode/typetree of Qi/Karma and can print out the PEG string
>> representation of what the parsing does?  For terminals it does not
>> know about would need to override a function or so that lets it print
>> out its representation.
>>
>> Would be great for debugging though.
>>
>> rule<...>  r1, r2;
>> r1 = int_>>  space>>  double_%',';
>> r2 = r1 | (lit('"')>>*~char_('"')>>lit('"'));
>> r1.name("r1");
>> r2.name("r2");
>>
>> ostringstream o;
>> peg_string(o, r2);
>> o.str(); // returns:
>>
>> r2 = r1 | ('"' (~'"')* '"')
>> r1 = int space double (',' double)*
>> int = /* however this is defined */
>> space = ' '|'\t'|'\r'|'\n'
>> double = /* however this is defined */
>>
>> Or something like that.  Does not need to be pretty, just get the
>> point across, would be great to toss into documentation for a created
>> parser too.
>
> That's one of the things Hartmut and I want to do with our planned
> BoostCon 2010 presentation.

Oh how I wish I could attend!  Will there be a video?

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