KVMap.h

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/*---------------------------------------------------------------------\
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|                               core system                            |
|                                                    (C) SuSE Linux AG |
\----------------------------------------------------------------------/

  File:       KVMap.h

  Author:     Michael Andres <ma@suse.de>
  Maintainer: Michael Andres <ma@suse.de>

  Purpose: Convenience stuff for handling (key,value) pairs

/-*/
#ifndef KVMap_h
#define KVMap_h

#include <iosfwd>
#include <vector>
#include <map>

#include "zypp/base/String.h"

namespace zypp {
  namespace kvmap {

    //
    //  CLASS NAME : KVMapBase::KVMapPolicy
    struct KVMapPolicy {
      std::string _kvsplit;
      std::string _fsplit;
      std::string _kvjoin;
      std::string _fjoin;
      KVMapPolicy( const std::string & kvsplit_r, const std::string & fsplit_r )
        : _kvsplit( kvsplit_r )
        , _fsplit ( fsplit_r )
        , _kvjoin ( _kvsplit )
        , _fjoin  ( _fsplit )
      {}
      KVMapPolicy( const std::string & kvsplit_r, const std::string & fsplit_r,
             const std::string & kvjoin_r )
        : _kvsplit( kvsplit_r )
        , _fsplit ( fsplit_r )
        , _kvjoin ( kvjoin_r )
        , _fjoin  ( _fsplit )
      {}
      KVMapPolicy( const std::string & kvsplit_r, const std::string & fsplit_r,
             const std::string & kvjoin_r, const std::string & fjoin_r )
        : _kvsplit( kvsplit_r )
        , _fsplit ( fsplit_r )
        , _kvjoin ( kvjoin_r )
        , _fjoin  ( fjoin_r )
      {}
    };

    //
    //  CLASS NAME : KVMapBase
    struct KVMapBase : public std::map<std::string,std::string> {
    
      typedef std::map<std::string,std::string> map_type;
    
      KVMapBase()
      {}
      KVMapBase( const map_type & kvmap_r )
        : std::map<std::string,std::string>( kvmap_r )
      {}
    
      bool has( const std::string & key_r ) const {
        return( find( key_r ) != end() );
      }
    
      template<char kv, char f>
      struct CharSep : public KVMapPolicy { CharSep() : KVMapPolicy( std::string(1,kv), std::string(1,f) ) {} };
    
    
      static map_type split( const std::string & str_r,
                         const KVMapPolicy & opts_r ) {
        map_type ret;
        std::vector<std::string> fields;
        str::split( str_r, std::back_inserter(fields), opts_r._fsplit );
    
        for ( unsigned i = 0; i < fields.size(); ++i ) {
          std::string::size_type pos = fields[i].find( opts_r._kvsplit );
          if ( pos == std::string::npos ) {
        ret[fields[i]] = "";
          } else {
        ret[fields[i].substr( 0, pos )] = fields[i].substr( pos+1 );
          }
        }
    
        return ret;
      }
    
      static std::string join( const map_type & kvmap_r,
                           const KVMapPolicy & opts_r ) {
        std::string ret;
    
        for ( map_type::const_iterator it = kvmap_r.begin(); it != kvmap_r.end(); ++it ) {
          if ( ! ret.empty() ) {
        ret += opts_r._fjoin;
          }
          ret += it->first;
          if ( !it->second.empty() ) {
        ret += opts_r._kvjoin + it->second;
          }
        }
    
        return ret;
      }
    
    };



  } // namespace kvmap


  //
  //    CLASS NAME : KVMap<KVMapOpts>
  template<typename KVMapOpts>
  struct KVMap : public kvmap::KVMapBase {
  
    KVMap()
    {}
    KVMap( const char * str_r )
      : kvmap::KVMapBase( split( (str_r?str_r:""), KVMapOpts() ) )
    {}
    KVMap( const std::string & str_r )
      : kvmap::KVMapBase( split( str_r, KVMapOpts() ) )
    {}
    KVMap( const map_type & map_r )
      : kvmap::KVMapBase( map_r )
    {}
  
    ~KVMap() {}
  
    std::string asString() const {
      return join( *this, KVMapOpts() );
    }
  
  };


  template<typename KVMapOpts>
  std::ostream & operator<<( std::ostream & str, const KVMap<KVMapOpts> & obj )
  { return str << obj.asString(); }

} // namespace zypp

#endif // KVMap_h