/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#pragma once

#include "cmConfigure.h" // IWYU pragma: keep

#include <cstddef>

#include <istream>

#include <string>

#include <utility>

#include <vector>

namespace Json {

class Value;

}

class cmJSONState

{

  using Location = struct

  {

    int line;

    int column;

  };

public:

  using JsonPair = std::pair<std::string const, Json::Value const*>;

  enum class StrictMode

  {

    Strict,

    Relaxed,

  };

  cmJSONState() = default;

  cmJSONState(std::string jsonFile, Json::Value* root,

              StrictMode strictMode = StrictMode::Strict);

  cmJSONState(std::istream& jsonIStream, Json::Value* root,

              StrictMode strictMode = StrictMode::Strict);

  void AddError(std::string const& errMsg);

  void AddErrorAtValue(std::string const& errMsg, Json::Value const* value);

  void AddErrorAtOffset(std::string const& errMsg, std::ptrdiff_t offset);

  std::string GetErrorMessage(bool showContext = true);

  std::string key();

  std::string key_after(std::string const& key);

  Json::Value const* value_after(std::string const& key);

  void push_stack(std::string const& key, Json::Value const* value);

  void pop_stack();

  class Error

  {

  public:

    Error(Location loc, std::string errMsg)

      : location(loc)

      , message(std::move(errMsg)) {};

    Error(std::string errMsg)

      : location({ -1, -1 })

      , message(std::move(errMsg)) {};

    std::string GetErrorMessage() const { return message; }

    Location GetLocation() const { return location; }

  private:

    Location location;

    std::string message;

  };

  std::vector<JsonPair> parseStack;

  std::vector<Error> errors;

  std::string doc;

  bool allowComments = false;

private:

  void ReadJSONStream(std::istream& jsonIStream, Json::Value* root,

                      StrictMode strictMode);

  std::string GetJsonContext(Location loc);

  Location LocateInDocument(ptrdiff_t offset);

  std::string Filename;

};