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

Mauricio,

Did you uncomment the line: //#include ?

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

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      compilation error. (Hartmut Kaiser) ----------------------------------------------------------------------

Message: 1 Date: Thu, 13 May 2010 18:28:19 -0500 From: "Hartmut Kaiser" To: 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"

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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 :

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 #include #include #include #include //#include

#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& 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 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::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