Add JSON print for desciptors

psd_debug.hpp

// Aseprite PSD Library
// Copyright (C) 2021 Igara Studio S.A.
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#ifndef PSD_DEBUG_H_INCLUDED
#define PSD_DEBUG_H_INCLUDED
#pragma once

#include "json.hpp"
#include "psd.h"

using json = nlohmann::json;

namespace psd {

inline json pretty_print(const OSType* ptr)
{
  //using key_type = std::result_of_t<decltype(std::declval<OSType>().type())>::type;
  using key_type = OSTypeKey;

  switch (ptr->type()) {
    case key_type::Descriptor: {
      json::object_t root_object;
      const auto desc = static_cast<const OSTypeDescriptor*>(ptr);
      root_object["class_name"] = desc->classId.name;
      root_object["desc_name"] = desc->descriptorName;
      json::object_t object;
      for (const auto& item: desc->descriptors) {
        object[item.first] = pretty_print(item.second.get());
      }
      root_object["desc"] = object;
      return root_object;
    }
    case key_type::List: {
      json::array_t json_list;
      const auto list = static_cast<const OSTypeList*>(ptr);
      for (const auto& value: list->values) {
        json_list.push_back(pretty_print(value.get()));
      }
      return json_list;
    }
    case key_type::Double:
      return static_cast<const OSTypeDouble*>(ptr)->value;
    case key_type::Long:
      return static_cast<const OSTypeInt*>(ptr)->value;
    case key_type::LargeInteger:
      return static_cast<const OSTypeLargeInt*>(ptr)->value;
    case key_type::String:
      return static_cast<const OSTypeString*>(ptr)->value;
    case key_type::Boolean:
      return static_cast<const OSTypeBoolean*>(ptr)->value;
    case key_type::UnitFloat: {
      json::object_t obj;
      const auto unitPtr = static_cast<const OSTypeUnitFloat*>(ptr);
      obj["value"] = unitPtr->value;
      obj["unit"] = unitPtr->unit;
      return obj;
    }
    default:
      return std::string();
  }
}
}

#undef TRACE
#define TRACE std::printf

#define PSD_JSON_PRINT(value) (TRACE("%s\n", \
  json(psd::pretty_print(value.get())).dump(1).c_str()))
#endif