CODEWITHSUNDEEP
c++boostboost-program-options
francesco
francesco

Reputation: 7539

boost program_option case insensitive parse of a configuration file

I would like to use boost::program_options to read the options from a configuration file, allowing for a case insensitive parsing.

Consider, e.g., the following simple code:

#include <iostream>
#include <fstream>
#include <string>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/parsers.hpp>
#include <boost/program_options/variables_map.hpp>

int main()
{
  using namespace std;
  namespace po = boost::program_options;

  ifstream inputfile("input.dat");
  po::options_description desc("");
  desc.add_options()
    ("l", po::value<unsigned int>())
    ;
  po::variables_map vm;
  po::store(po::parse_config_file(inputfile, desc), vm);
  po::notify(vm);

  if (vm.count("l"))
    cout << "l is set as " << vm["l"].as<unsigned int>() << endl;
  else
    cout << "l is not set";

  return 0;
}

With the following input.dat file

l=3

the program runs fine giving output

l is set as 3

If I change the input.dat as

L=3

the program terminates raising an exception

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::unknown_option> >'
  what():  unrecognised option 'L'
Aborted

Case-insensitive parsing is apparently possible on the command-line, see the discussion here. Is it possible to have a case-insentive parsing also for reading from a configuration file?

Upvotes: 2

Views: 277

Answers (1)

sehe
sehe

Reputation: 393114

That's not an option.

You can suggest features to the library maintainers.

You can eithr convert the inifile to preferred case using other tools, or add options descriptions for case complements.

Upvotes: 1

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