JPrinter.hh

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#ifndef __JSON__JPRINTER__
#define __JSON__JPRINTER__

#include <ostream>
#include <iomanip>

#include "JSon/JSon.hh"


/**
 * \author mdejong
 */

namespace JSON {}
namespace JPP { using namespace JSON; }

namespace JSON {

  /**
   * Auxiliary data structure to print (part of) JSon data.
   *
   * The key can be used to specify which part of the JSon data to print.\n
   * For example:
   * <pre>
   *   "Error.Code+Message"
   * </pre>
   * will print both the error code and message of some specific JSon data.
   */
  struct JPrinter {

    char SEPARATOR[2] = { '.', '+' };
    int  WIDTH        = 2;

    /**
     * Defaut constructor.
     */
    JPrinter()
    {}


    /**
     * Auxiliary method to print (part of) JSon data.
     *
     * \param  out        output stream
     * \param  js         JSon data
     * \param  key        key
     */
    inline std::ostream& operator()(std::ostream& out, const JSON::json& js, const std::string& key) const
    {
      using namespace std;

      size_t pos = key.find(SEPARATOR[0]);

      if (pos != string::npos) {

        if (js[key.substr(0, pos)].is_array()) {

          for (const auto& element : js[key.substr(0, pos)]) {
            (*this)(out, element, key.substr(pos + 1));
          }

        } else {

          (*this)(out, js[key.substr(0, pos)], key.substr(pos + 1));
        }

      } else if (key != "") {

        pos = key.find(SEPARATOR[1]);

        out << setw(WIDTH) << js[key.substr(0, pos)] << endl;

        if (pos != string::npos) {
          (*this)(out, js, key.substr(pos + 1));
        }

      } else {

        out << setw(WIDTH) << js << endl;
      }

      return out;
    }
  };
}

#endif