Re: [Boost-users] Spirit: parsing tab separated values and no_skip

Subject: Re: [Boost-users] Spirit: parsing tab separated values and no_skip
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2010-05-18 17:44:48

Mauricio,

> Did you uncomment the line:
> //#include <boost/spirit/include/qi_no_skip.hpp> ?
> 
> It is commented out in the code below. If I include this line, compilation
> fails.

Compiles fine for me (gcc 4.5, msvc 10).

> You also have to check optimizations because the code below is not using
> no_skip[] in the grammar so there is a chance that a smart compiler that
> is not in debug mode might ignore the non-used code.
> In my case I am in debug mode, no optmizations and including the
> qi_no_skip.hpp header suffices to get the error.

No optimization here.

Regards Hartmut

---------------
Meet me at BoostCon
www.boostcon.com

> 
> 1. Re: Spirit: parsing tab separated values and      no_skip
> 
> >      compilation error. (Hartmut Kaiser)
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 13 May 2010 18:28:19 -0500
> > From: "Hartmut Kaiser" <hartmut.kaiser_at_[hidden]>
> > To: <boost-users_at_[hidden]>
> > Subject: Re: [Boost-users] Spirit: parsing tab separated values and
> >        no_skip compilation error.
> > Message-ID: <0d5301caf2f3$fa1c64e0$ee552ea0$@gmail.com>
> > Content-Type: text/plain;       charset="iso-8859-1"
> >
> > > I am a beginner with Spirit. I just read the tutorial and I am
> > > playing around with some examples.
> > > Environment: boost 1.43, Windows Vista, Code::Blocks, mingw, gcc 4.5.
> > >
> > > My goal is to build a tab separated values parser.
> > > If you have an example on how to parse something like:
> > > string/t/tdouble/tdouble
> > > it would be great. Contiguous tabs should be considered as one tab,
> > > not
> > an
> > > empty field.
> > >
> > > To start I just tried to parse a tab separated list of strings but I
> > > am having some difficulties.
> > >
> > > Is there another skip parser to be used instead of space (for full
> > > code see the end of the message below) ?
> > > I have changed the commas to tabs in the code below but it failed. I
> > guess
> > > it was because it was skipping them (space skipper).
> > >
> > > ??????? bool r = phrase_parse(first, last,
> > >
> > > ??????????? //? Begin grammar
> > > ??????????? (
> > > ??????????????? +(char_ - ',') % ','
> > > ??????????? )
> > > ??????????? ,
> > > ??????????? //? End grammar
> > >
> > > ??????????? space, v);
> > >
> > > This code works with commas but it fails with '\t'.
> > >
> > > I tried to use no_skip[] but it failed to compile the header
> > > #include
> > > <boost/spirit/include/qi_no_skip.hpp>:
> > >
> > > C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|30|error:
> > > 'no_skip' is not a member of 'boost::spirit::tag'|
> > >
> > > For full error message see the end of the message below.
> > >
> > > Any suggestions ?
> > >
> > > Thank you for your attention,
> > > Mau.
> > >
> > > #include <boost/config/warning_disable.hpp>
> > > #include <boost/spirit/include/qi.hpp> #include
> > > <boost/spirit/include/phoenix_core.hpp>
> > > #include <boost/spirit/include/phoenix_operator.hpp>
> > > #include <boost/spirit/include/phoenix_stl.hpp>
> > > //#include <boost/spirit/include/qi_no_skip.hpp>
> > >
> > > #include <iostream>
> > > #include <string>
> > > #include <vector>
> > >
> > > #define VECTOR_TYPE std::string
> > >
> > > namespace client
> > > {
> > > ??? namespace qi = boost::spirit::qi; ??? namespace ascii =
> > > boost::spirit::ascii;
> > >
> > > ???
> > //////////////////////////////////////////////////////////////////////
> > > /////
> > > ??? //? Our number list compiler
> > > ???
> > //////////////////////////////////////////////////////////////////////
> > > /////
> > > ??? //[tutorial_numlist4
> > > ??? template <typename Iterator>
> > > ??? bool parse_numbers(Iterator first, Iterator last,
> > > std::vector<VECTOR_TYPE>& v) ??? { ??????? using qi::double_;
> > > ??????? using qi::phrase_parse; ??????? using qi::_1; ??????? using
> > > ascii::space; ??????? using qi::char_;
> > >
> > > ??????? bool r = phrase_parse(first, last,
> > >
> > > ??????????? //? Begin grammar
> > > ??????????? (
> > > ??????????????? +(char_ - ',') % ','
> > > ??????????? )
> > > ??????????? ,
> > > ??????????? //? End grammar
> > >
> > > ??????????? space, v);
> > >
> > > ??????? if (first != last) // fail if we did not get a full match
> > > ??????????? return false; ??????? return r; ??? } ??? //] }
> > >
> > >
> > //////////////////////////////////////////////////////////////////////
> > ////
> > > //
> > > //? Main program
> > >
> > //////////////////////////////////////////////////////////////////////
> > ////
> > > //
> > > int
> > > main()
> > > {
> > > ??? std::cout <<
> > > "/////////////////////////////////////////////////////////\n\n";
> > > ??? std::cout << "\t\tA comma separated list parser for
> > > Spirit...\n\n"; ??? std::cout <<
> > > "/////////////////////////////////////////////////////////\n\n";
> > >
> > > ??? std::cout << "Give me a comma separated list of numbers.\n"; ???
> > > std::cout << "The numbers will be inserted in a vector of
> > > numbers\n"; ??? std::cout << "Type [q or Q] to quit\n\n";
> > >
> > > ??? std::string str;
> > > ??? while (getline(std::cin, str))
> > > ??? {
> > > ??????? if (str.empty() || str[0] == 'q' || str[0] == 'Q')
> > > ??????????? break;
> > >
> > > ??????? std::vector<VECTOR_TYPE> v;
> > > ??????? if (client::parse_numbers(str.begin(), str.end(), v))
> > > ??????? { ??????????? std::cout << "-------------------------\n";
> > > ??????????? std::cout << "Parsing succeeded\n"; ???????????
> > > std::cout << str << " Parses OK: " << std::endl;
> > >
> > > ??????????? for (std::vector<VECTOR_TYPE>::size_type i = 0; i <
> > > v.size();
> > > ++i)
> > > ??????????????? std::cout << i << ": " << v[i] << std::endl;
> > >
> > > ??????????? std::cout << "\n-------------------------\n"; ??????? }
> > > ??????? else ??????? { ??????????? std::cout <<
> > > "-------------------------\n"; ??????????? std::cout << "Parsing
> > > failed\n"; ??????????? std::cout << "-------------------------\n";
> > > ??????? } ??? }
> > >
> > > ??? std::cout << "Bye... :-) \n\n";
> > > ??? return 0;
> > > }
> >
> > This example compiles fine for me (VC10, g++ 4.5). Is it supposed to
> fail?
> >
> > Regards Hartmut
> >