cpp-json/json_binder.hpp

//
//  json_binder.h
//  json
//
//  Created by Sam Jaffe on 1/31/16.
//  Copyright © 2016 Sam Jaffe. All rights reserved.
//

#ifndef json_binder_h
#define json_binder_h
#pragma once

#include "json_common.hpp"

#include <map>
#include <string>
#include <sstream>
#include <vector>

namespace json {
  namespace binder {
    template <typename T>
    class binder_impl {
    public:
      virtual binder_impl<T>* clone() const = 0;
      virtual ~binder_impl() {}
      virtual void parse(T&, char const*&, parser::options) const = 0;
      virtual void write(T const&, std::ostream &) const = 0;
    };
    
    template <typename T>
    class binder {
    public:
      binder() : impl(nullptr) {}
      binder(binder const& other) : impl(other.impl->clone()) {}
      binder(binder_impl<T> const* p) : impl(p) {}
      binder(binder_impl<T> const& r) : impl(r.clone()) {}
      
      ~binder() { delete impl; }
      
      void parse(T& object, char const*& data, parser::options opts) const {
        if (!impl) return; // error?
        impl->parse(object, data, opts);
      }
      
      void write(T const& object, std::ostream & data) const {
        if (!impl) return; // error?
        impl->write(object, data);
      }
    private:
      binder_impl<T> const* impl;
    };
    
    template <typename T, typename S = T>
    class visitor {
    public:
      visitor(S& o, binder_impl<T>& b) : obj(o), b(b) {}
      
      void parse(char const* data, parser::options opts) {
        b.parse(obj, data, opts);
        if ( json::helper::get_next_element(data) && opts & parser::disable_concatenated_json_bodies ) {
          throw malformed_json_exception{"Config set to require json input be terminated"};
        }
      }
      
      void write(std::ostream & data) const {
        b.write(obj, data);
      }
      
    private:
      S& obj;
      binder_impl<T>& b;
    };
    
    template <typename T, typename S>
    visitor<T, S> bind(S& object, binder_impl<T>& b) {
      return visitor<T, S>{object, b};
    }
  }
  
  namespace parser {    
    template <typename T>
    void parse(binder::visitor<T>& visitor, char const* data, options opts = allow_all) {
      visitor.parse(data, opts);
    }
        
    template <typename T, typename S>
    void write(binder::visitor<T, S> const & visitor, std::ostream & out) {
      visitor.write(out);
    }
    
    template <typename T, typename S>
    void write(binder::visitor<T, S> const & visitor, std::string & data) {
      std::stringstream ss;
      visitor.write(ss);
      data = ss.str();
    }
  }
}

#include "json/json_binder_parser.hpp"
#include "json/json_direct_binder.hpp"
#include "json/json_tuple_binder.hpp"
#include "json/json_object_binder.hpp"
#include "json/json_direct_get_binder.hpp"
#include "json/json_direct_map_binder.hpp"
#include "json/json_direct_scalar_binder.hpp"
#include "json/json_direct_vector_binder.hpp"

#endif /* json_binder_h */