Re: X3 employee example with semantic actions

On 06/05/2018 07:26 PM, Maarten Verhage wrote:
> 
> ----- Original Message -----
> From: "Larry Evans" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, June 06, 2018 01:58
> Subject: Re: [Spirit-general] X3 employee example with semantic actions
> 
> 
>> On 06/05/2018 01:38 PM, Maarten Verhage wrote:
>> [snip]
>>> In the meantime I've learned by fortunate accident that the parser
>>> directive
>>> **raw** will provide me the iterator range I'm after. As a general remark
>>> on
>>> this. It is nice if you can immediately understand the facilities
>>> provided
>>> in a documentation page like the Parser Directives. If you don't little
>>> effort is made to properly present the ideas behind these facilities.
>>> Maybe
>>> the Spirit developers are annoyed by what they might consider as naive
>>> questions about obvious things in this mailing list. While I believe that
>>> if
>>> you improve the documentation and explain for with purpose you provide
>>> facilities people can much faster understand it, and the amount of
>>> "stupid"
>>> questions can be heavily reduced.
>>>
>> To supply a real life use case for what's described in the above
>> paragraph,  I've looked at the doc for raw as expressed in the xml
>> generated from:
>>
>> https://github.com/boostorg/spirit/tree/develop/doc/x3
>>
>> That contains:
>>
>>   raw[a]
>>
>>     boost::iterator_range<I>
>>
>>     Presents the transduction of a as an iterator range
>>
>>  From this I infer that an interator_range<I> is produced
>> where I is the Iterator to the parsers.
>>
>> But how do I use this.  Grep'ing for raw shows:
>>
>> -*- mode: compilation; default-directory:
>> "~/prog_dev/boost/releases/ro/boost_1_67_0/sandbox/lje/spirit-experiments/include/boost/spirit/home/x3/"
>>   -*-
>> Compilation started at Tue Jun  5 18:43:54
>>
>> find . -name \*.hpp -exec grep -e '\<raw\>' {} \; -ls
>>      auto const raw = raw_gen{};
>>    9109799     12 -rw-rw-r--   1 evansl   evansl       2534 Jan 19 14:59
>> ./directive/raw.hpp
>>          // attr==raw_attribute_type, action wants iterator_range (see
>> raw.hpp)
>>    9049853     16 -rw-rw-r--   1 evansl   evansl       4718 Jun  4 22:09
>> ./core/action.hpp
>> #include <boost/spirit/home/x3/directive/raw.hpp>
>>    9109791     12 -rw-rw-r--   1 evansl   evansl       1286 Jan 19 14:59
>> ./directive.hpp
>>
>> Compilation finished at Tue Jun  5 18:43:54
>>
>> so, a brief look at that code still didn't clear things up; so,
>> Please, Maarten, could you post the code where you make use
>> of raw so I wouldn't have to further guess how to do it?
>>
>> -hopefully,
>> Larry
> 
> Hi Larry,
> 
> I'm not yet familiar with grep. I assume you do look into the Spirit X3
> source code to learn how to use it? 

Yep. Tried, but that didn't help.  Now that I understand what raw does,
the docs make perfect sense.

> I have just added the raw directive into
> the employee example code. And it did want I was after. In the attached
> source code you can see exactly how.
> 
> I've some facility to print a type by the name of utility::type2string. This
> is not needed for the example but I can provide that if you are interested.
> 
> Regards, Maarten
> 

Hmmm.  So you surround the quoted_string with raw.  I thought you'd
surround the whole employee with raw.  That's why example code
is ***so*** much better than trying to describe what someone is trying
to do!

-regards,
Larry



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