cpp-json/include/json/binder/json_direct_vector_binder.hpp

//
//  json_direct_vector_binder.hpp
//  json
//
//  Created by Sam Jaffe on 4/23/16.
//

#pragma once

#include "json_binder.hpp"
#include "json_direct_binder.hpp"

#include <list>
#include <set>
#include <vector>

namespace json { namespace binder {
  template <typename T, typename V, typename C>
  class non_associative_binder : public binder_impl<T> {
  public:
    non_associative_binder(C T::*p) : ptr(p), impl(value_binder<V>()) {}
    non_associative_binder(C T::*p, binder<V> const & i) : ptr(p), impl(i) {}
    virtual binder_impl<T> * clone() const override {
      return new non_associative_binder(*this);
    }

    virtual void parse(T & val, char const *& data,
                       parser::options opts) const override {
      const char ch = json::helper::get_next_element(data);
      if (ch != '[') { throw not_an_array_exception(val); }
      ++data;

      V to_make;
      C & vec = val.*ptr;
      while (*data && *data != ']') {
        impl.parse(to_make, data, opts);
        vec.emplace_back(to_make);
        json::helper::advance_to_boundary(']', data);
      }
      if (*data)
        ++data;
      else
        throw unterminated_json_array();
    }

    virtual void write(T const & val, std::ostream & data) const override {
      data << '[';
      std::vector<V> const & vec = val.*ptr;
      auto it = vec.begin(), end = vec.end();
      if (it != end) {
        impl.write(*it, data);
        for (++it; it != end; ++it) {
          data << ",";
          impl.write(*it, data);
        }
      }
      data << ']';
    }

  private:
    std::vector<V> T::*ptr;
    binder<V> impl;
  };

#define NON_ASSOCIATIVE_DIRECT_BINDER(C)                                       \
  template <typename T, typename V, typename... O>                             \
  class direct_binder<T, C<V, O...>>                                           \
      : public non_associative_binder<T, V, C<V, O...>> {                      \
  public:                                                                      \
    using non_associative_binder<T, V, C<V, O...>>::non_associative_binder;    \
  }

  NON_ASSOCIATIVE_DIRECT_BINDER(std::vector);
  NON_ASSOCIATIVE_DIRECT_BINDER(std::list);
  NON_ASSOCIATIVE_DIRECT_BINDER(std::set);
  //  NON_ASSOCIATIVE_DIRECT_BINDER( std::unordered_set );
}}