Hi,
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;
}
Error messages when compiling with the no_skip include file:
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'|
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'|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|30|error:
template argument 2 is invalid|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|36|error:
'boost::spirit::no_skip' has not been declared|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|37|error:
'boost::spirit::no_skip_type' has not been declared|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|79|error:
'no_skip' is not a member of 'boost::spirit::tag'|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|79|error:
'no_skip' is not a member of 'boost::spirit::tag'|
C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|79|error:
template argument 1 is invalid|
||=== Build finished: 8 errors, 0 warnings ===|
--
Mauricio Gomes
Pensar Digital
55-11-9698-1683 (Brazil - mobile)
