configure.hh

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#ifndef DATAQUEUE_CONFIGURE_HH
#define DATAQUEUE_CONFIGURE_HH

#include <vector>
#include <stdexcept>

#include <boost/foreach.hpp>
#include <boost/tokenizer.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/algorithm/string/trim.hpp>

/**
 * \author cpellegrino
 */

namespace detail
{
  static const boost::char_separator<char> args_sep(";");
  static const boost::char_separator<char> fields_sep("=");
  static const boost::char_separator<char> white_spaces("\t ");

  inline
  boost::property_tree::ptree parse(std::string str)
  {
    boost::algorithm::trim(str);
    boost::property_tree::ptree pt;
    boost::tokenizer<boost::char_separator<char> > tok(str, args_sep);

    BOOST_FOREACH(std::string s, tok)
    {
      boost::algorithm::trim(s);
      boost::tokenizer<boost::char_separator<char> > fields(s, fields_sep);
      typedef boost::tokenizer<boost::char_separator<char> >::iterator Iter;

      Iter it = fields.begin();

      std::string varname = *it;
      boost::algorithm::trim(varname);

      ++it;
      if (it != fields.end()) {
        std::string val = *it;
        boost::algorithm::trim(val);

        pt.put(varname, val);
        ++it;
      } else {
        throw std::runtime_error("Parsing error: malformed input buffer.");
      }

      if (it != fields.end()) {
        throw std::runtime_error("Parsing error: malformed input buffer.");
      }
    }
    return pt;
  }

  template<typename T>
  std::vector<T> vectorize(const std::string& str)
  {
    std::vector<T> vec;

    boost::tokenizer<boost::char_separator<char> > elements(str, white_spaces);

    BOOST_FOREACH(std::string elem, elements)
    {
      vec.push_back(boost::lexical_cast<T>(elem));
    }

    return vec;
  }

} // ns detail

#endif // DATAQUEUE_CONFIGURE_HH