reader.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2020 Vincent Lachenal
 
  This file is part of ANCH Framework.
 
  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
 
  ANCH Framework is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <istream>
#include <string>
#include <any>
 
#include "json/readerContext.hpp"
#include "json/mappingError.hpp"
#include "events/observable.hpp"
 
namespace anch::json {

  enum class EventType {

    VNULL = 0,

    TRUE,

    FALSE,

    FIELD,

    NUMBER,

    STRING,

    BEGIN_OBJECT,

    END_OBJECT,

    BEGIN_ARRAY,

    END_ARRAY
 
  };

  class JSONItem {
 
    // Attributes +
  private:
    anch::json::EventType _type;

    std::any _value;
    // Attributes -
 
    // Constructors +
  public:
    JSONItem() = delete;

    JSONItem(anch::json::EventType type, anch::json::ReaderContext& context);
    // Constructors -
 
    // Destructor +
  public:
    virtual ~JSONItem() noexcept;
    // Destructor -
 
    // Accessors +
  public:
    anch::json::EventType getType() const;

    const std::any& getValue() const;
    // Accessors -
 
  };

  class Reader:
    public anch::events::Observable<anch::json::JSONItem>,
    public anch::events::Observable<std::streamsize>,
    public anch::events::Observable<anch::json::MappingError>,
    private anch::json::ReaderContext {
 
    // Constructors +
  public:
    Reader() = delete;

    Reader(const Reader& reader) = delete;

    Reader(Reader&& reader) = delete;

    Reader(std::istream& is, const anch::json::MappingOptions& mappingOptions);
    // Constructors -
 
    // Destructor +
  public:
    virtual ~Reader();
    // Destructor -
 
    // Methods +
  public:
    void parse() noexcept;

    anch::events::Observable<JSONItem>& itemObs();

    anch::events::Observable<std::streamsize>& sizeObs();

    anch::events::Observable<anch::json::MappingError>& errorObs();
 
  protected:
    virtual std::streamsize refillBuffer();
 
  private:
    void parseField();

    void parseObject();

    void parseValue();

    void parseArray();
    // Methods -
 
  };
 
}
 
#include "json/impl/reader.hpp"