Re: [Boost-users] [Boost.Spirit] Skippers for sub-grammars

On Fri, Oct 22, 2010 at 6:58 AM, Vitaly Budovski wrote:

On 22 October 2010 23:06, Hartmut Kaiser wrote:

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I've decided to break up my parser into sub-grammars to improve both the readability and compile time. I'm now trying to specify a skip parser for one of the sub-grammars, but I don't know how to do it. I'm familiar with specifying a skip parser in the parse functions, but not in the grammar itself. Could somebody please provide an example? Thanks.

You need to pass the skipper type to the subgrammar (see attached). Additionally you need to utilize phrase_parse() instead of parse to hand down a skipper instance.

Regards Hartmut --------------- http://boost-spirit.com

Hi Hartmut,

Thank you very much for the reply. I do have another question though: Is it possible for the top level grammar to have its own skipper? If there are multiple sub-grammars, can they also have a different skipper each? If not, I guess I would have to put all the possible alternatives into the one skipper grammar, right?

They can, that is what the skip()[] directive is for (see docs).