Re: [boost] Spirit Not Parsing

Subject: Re: [boost] Spirit Not Parsing
From: Aston (blackapache512-ticket_at_[hidden])
Date: 2009-05-28 01:07:02

ooppss...my bad

mistake is in parse_conf_file() below line is incorrect, wrong grammar
rule<> conf_lines = l_root | *l_params | l_end;

correct line is 
rule<> conf_lines = l_root >> *l_params >> l_end;

sorry for pollution




________________________________
From: Aston <blackapache512-ticket_at_[hidden]>
To: boost_at_[hidden]
Sent: Thursday, 28 May, 2009 10:18:16 AM
Subject: Spirit Not Parsing


Hello,

I am evaluating Boot.Spirit for parsing a custom format. I have presented the code below and config file as well.
I expect numUsers to be 2 but it is zero, indicating that integer_action() was not call at all.
I tried with assign_d as well, it also didn't help. I guess I am missing something, and I cannot figure out that
since parse() returns 0. can anybody point that out ?

thanks,
Aston

============ src file begin ============
#include <iostream>
#include <fstream>
#include <string>
#include <boost/spirit.hpp>

using namespace boost::spirit;

int numUsers = 0;

void integer_action( const int& var)
{
    numUsers = var;
};

int parse_conf_file( char* buffer)
{
    rule<> l_root = str_p("FakeRC") >> *blank_p >> *alpha_p >> eol_p;
    rule<> l_params = *blank_p >> *alpha_p >> *blank_p >> str_p("Integer") >> *blank_p >> *int_p[&integer_action] >> eol_p;
    rule<> l_end = str_p("end") >> eol_p;

    rule<> conf_lines = l_root | *l_params | l_end;
    return parse( buffer, conf_lines).full;
}

int main( int argc, char** argv)
{
    std::ifstream conf(".fakerc", std::ios::binary);

    conf.seekg( 0, std::ios::beg);
    int start = conf.tellg();
    conf.seekg( 0, std::ios::end);
    int end = conf.tellg();
    int size = end - start;

    conf.seekg( 0, std::ios::beg);
    char* buffer = new char[size];
    std::fill( buffer, buffer + size, 0);
    conf.read( buffer, size);
    buffer[size - 1] = 0;
    int err_code = parse_conf_file( buffer);

    std::cout << ( err_code == 0 ? "success" : "failed");
    std::cout << ": " << err_code << std::endl;
    std::cout << "numUsers: " << numUsers << std::endl;

    delete[] buffer;
    conf.close();
    return 0;
}
============ src file end ============

============ .fakerc contents ============
FakeRC                                FakeRC_Name
  Users                              Integer                   2
end
============ end .fakerc ============


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