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// file      : xsd/cxx/tree/ostream.hxx
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file

#ifndef XSD_CXX_TREE_OSTREAM_HXX
#define XSD_CXX_TREE_OSTREAM_HXX

#include <map>
#include <string>
#include <memory>  // std::auto_ptr/unique_ptr
#include <cstddef> // std::size_t

#include <xsd/cxx/config.hxx> // XSD_AUTO_PTR

namespace xsd
{
  namespace cxx
  {
    namespace tree
    {
      class ostream_common
      {
      public:
        template <typename T>
        struct as_size
        {
          explicit as_size (T x) : x_ (x) {}
          T x_;
        };


        // 8-bit
        //
        template <typename T>
        struct as_int8
        {
          explicit as_int8 (T x) : x_ (x) {}
          T x_;
        };

        template <typename T>
        struct as_uint8
        {
          explicit as_uint8 (T x) : x_ (x) {}
          T x_;
        };


        // 16-bit
        //
        template <typename T>
        struct as_int16
        {
          explicit as_int16 (T x) : x_ (x) {}
          T x_;
        };

        template <typename T>
        struct as_uint16
        {
          explicit as_uint16 (T x) : x_ (x) {}
          T x_;
        };


        // 32-bit
        //
        template <typename T>
        struct as_int32
        {
          explicit as_int32 (T x) : x_ (x) {}
          T x_;
        };

        template <typename T>
        struct as_uint32
        {
          explicit as_uint32 (T x) : x_ (x) {}
          T x_;
        };


        // 64-bit
        //
        template <typename T>
        struct as_int64
        {
          explicit as_int64 (T x) : x_ (x) {}
          T x_;
        };

        template <typename T>
        struct as_uint64
        {
          explicit as_uint64 (T x) : x_ (x) {}
          T x_;
        };


        // Boolean
        //
        template <typename T>
        struct as_bool
        {
          explicit as_bool (T x) : x_ (x) {}
          T x_;
        };


        // Floating-point
        //
        template <typename T>
        struct as_float32
        {
          explicit as_float32 (T x) : x_ (x) {}
          T x_;
        };

        template <typename T>
        struct as_float64
        {
          explicit as_float64 (T x) : x_ (x) {}
          T x_;
        };
      };

      template<typename S>
      class ostream: public ostream_common
      {
      public:
        explicit
        ostream (S& s)
            : s_ (s), seq_ (1)
        {
        }

        S&
        impl ()
        {
          return s_;
        }

        // If the string is not in the pool, add it and return 0. Otherwise
        // return the string's pool id. In the former case the application
        // should serialize the original string.
        //
        // The returned ids are sequential and start with 1. 0 is reserved
        // as a special marker to be used by the application for the first
        // encounter of the string.
        //
        template <typename C>
        std::size_t
        pool_string (const std::basic_string<C>& s)
        {
          typedef pool_impl<C> pool_type;

          if (pool_.get () == 0)
            pool_.reset (new pool_type);

          pool_type& p (*static_cast<pool_type*> (pool_.get ()));

          std::pair<typename pool_type::iterator, bool> r (
            p.insert (std::pair<std::basic_string<C>, std::size_t> (s, seq_)));

          if (!r.second)
            return r.first->second;

          seq_++;
          return 0;
        }

      private:
        ostream (const ostream&);
        ostream&
        operator= (const ostream&);

      private:
        struct pool
        {
          virtual
          ~pool () {}
        };

        template <typename C>
        struct pool_impl: pool, std::map<std::basic_string<C>, std::size_t>
        {
        };

        S& s_;
        std::size_t seq_;
        XSD_AUTO_PTR<pool> pool_;
      };


      // 8-bit
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, signed char x)
      {
        return s << ostream_common::as_int8<signed char> (x);
      }

      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, unsigned char x)
      {
        return s << ostream_common::as_uint8<unsigned char> (x);
      }


      // 16-bit
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, short x)
      {
        return s << ostream_common::as_int16<short> (x);
      }

      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, unsigned short x)
      {
        return s << ostream_common::as_uint16<unsigned short> (x);
      }


      // 32-bit
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, int x)
      {
        return s << ostream_common::as_int32<int> (x);
      }

      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, unsigned int x)
      {
        return s << ostream_common::as_uint32<unsigned int> (x);
      }


      // 64-bit
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, long long x)
      {
        return s << ostream_common::as_int64<long long> (x);
      }

      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, unsigned long long x)
      {
        return s << ostream_common::as_uint64<unsigned long long> (x);
      }

      // Boolean
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, bool x)
      {
        return s << ostream_common::as_bool<bool> (x);
      }


      // Floating-point
      //
      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, float x)
      {
        return s << ostream_common::as_float32<float> (x);
      }

      template <typename S>
      inline ostream<S>&
      operator<< (ostream<S>& s, double x)
      {
        return s << ostream_common::as_float64<double> (x);
      }
    }
  }
}

#endif  // XSD_CXX_TREE_OSTREAM_HXX