cpp-json/json.hpp

//
//  json.hpp
//  json
//
//  Created by Sam Jaffe on 1/30/16.
//  Copyright © 2016 Sam Jaffe. All rights reserved.
//

#ifndef json_hpp
#define json_hpp

#include "../variant/variant.hpp"
#include "json_common.hpp"

#include <utility>

#define JSON_TYPE_LIST \
  X(object) \
  X(array) \
  X(string) \
  X(double) \
  X(int) \
  X(uint) \
  X(bool)

namespace json {
  namespace {
    const constexpr json::int_jt INT_JT_MAX_LAST_DIGIT = (0x7FFFFFFF % 10);
    const constexpr json::int_jt INT_JT_MAX = json::uint_jt(-1) - 1;
    const constexpr json::int_jt INT_JT_MIN = json::int_jt(~(json::uint_jt(-1) / 2));
    const constexpr json::uint_jt INT_JT_OVER = json::uint_jt(INT_JT_MAX) + 1;
    const constexpr json::uint_jt UINT_JT_MAX = json::uint_jt(0) - 1;
    //  const constexpr json::uint_jt UINT_JT_MIN = 0;
  }
  
  class value;
  namespace parser {
    void parse(value&, char const*);
  }
  
  class value {
  public:
    using object_jt = std::map<std::string, value>;
    using array_jt = std::vector<value>;
    using string_jt = json::string_jt;
    using double_jt = json::double_jt;
    using int_jt = json::int_jt;
    using uint_jt = json::uint_jt;
    using bool_jt = json::bool_jt;
  private:
    static const value null_value;
    
    using data_t = variant<object_jt, array_jt, string_jt, double_jt, int_jt, uint_jt, bool_jt>;
    data_t data;
  public:
#define X(type) bool is_##type() const { return data.is<type##_jt>(); }
    JSON_TYPE_LIST
#undef X
    bool is_null() const { return !data.valid(); }
    
    value() = default;
    value(value const&) = default;
    value(value &&) = default;
    value& operator=(value const&) = default;
    value& operator=(value &&) = default;
#define X(type) value(type##_jt val) { data.set<type##_jt>(std::move(val)); }
    JSON_TYPE_LIST
#undef X
#define X(type) value(type##_jt && val) { data.set<type##_jt>(std::forward<type##_jt>(val)); }
    JSON_TYPE_LIST
#undef X
#define X(type) value& operator=(type##_jt val) { data.set<type##_jt>(std::move(val)); return *this; }
    JSON_TYPE_LIST
#undef X
    
    void parse(char const* data);
    void parse(std::string const& str);
    void parse(std::istream & in);
    
    void clear() { data = data_t(); }
    
    value& operator[](const size_t idx);
    value const& operator[](const size_t idx) const;
    value& operator[](std::string const& key);
    value const& operator[](std::string const& key) const;
    
    string_jt const& as_string() const;
    double_jt as_double() const;
    int_jt as_int() const;
    uint_jt as_uint() const;
    bool_jt as_bool() const;
    
    operator string_jt const&() const { return as_string(); }
    operator double_jt() const { return as_double(); }
    operator int_jt() const { return as_int(); }
    operator uint_jt() const { return as_uint(); }
    operator bool_jt() const { return as_bool(); }
    
  };
#undef JSON_TYPE_LIST
}

#endif /* json_hpp */