Spirit: parsing tab separated values and no_skip

18 May 2010

      Hi Harmut,

Did you uncomment the line:
//#include  ?

It is commented out in the code below. If I include this line, compilation
fails.
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.

Thanks for your attention !

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" 
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"
...
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

Mauricio Gomes

Hartmut Kaiser

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