rapid_json_iterator.h

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*/
 
#ifndef ROUTER_SRC_REST_MRS_SRC_HELPER_JSON_RAPID_JSON_INTERATOR_H_
#define ROUTER_SRC_REST_MRS_SRC_HELPER_JSON_RAPID_JSON_INTERATOR_H_
 
#include <utility>
 
#ifdef RAPIDJSON_NO_SIZETYPEDEFINE
#include "my_rapidjson_size_t.h"
#endif
 
#include <rapidjson/document.h>
 
namespace helper {
 
namespace json {
 
template <typename Object = rapidjson::Document::ConstObject,
          typename Holder = Object *>
class IterableObject {
 public:
  using Value = rapidjson::Document::ValueType;
  using MemberIterator = typename Object::ConstMemberIterator;
  using Pair = std::pair<const char *, const Value *>;
 
  class It {
   public:
    It(MemberIterator it) : it_{it} {}
 
    It &operator++() {
      ++it_;
      return *this;
    }
    auto operator*() { return Pair(it_->name.GetString(), &it_->value); }
    bool operator!=(const It &other) { return it_ != other.it_; }
 
   private:
    MemberIterator it_;
  };
 
 public:
  IterableObject(Holder object) : obj_{object} {}
 
  It begin() { return It{obj_->MemberBegin()}; }
  It end() { return It{obj_->MemberEnd()}; }
 
  Holder obj_;
};
 
template <typename Array = rapidjson::Document::ConstArray,
          typename Holder = Array *,
          typename Iterator = typename Array::ValueIterator>
class IterableArray {
 public:
  using Value = rapidjson::Document::ValueType;
 
 public:
  IterableArray(Holder a) : arr_{a} {}
 
  Iterator begin() { return arr_->Begin(); }
  Iterator end() { return arr_->End(); }
 
  Holder arr_;
};
 
template <typename Obj>
auto member_iterator(Obj &o) {
  return IterableObject<Obj>(&o);
}
 
inline auto array_iterator(const rapidjson::Value::ConstArray &o) {
  return IterableArray<const rapidjson::Value::ConstArray,
                       const rapidjson::Value::ConstArray *,
                       rapidjson::Value::ConstArray::ConstValueIterator>(&o);
}
 
inline auto array_iterator(rapidjson::Value::Array &o) {
  return IterableArray<rapidjson::Value::Array, rapidjson::Value::Array *,
                       rapidjson::Value::Array::ValueIterator>(&o);
}
 
}  // namespace json
 
}  // namespace helper
 
#endif  // ROUTER_SRC_REST_MRS_SRC_HELPER_JSON_RAPID_JSON_INTERATOR_H_