ai_scanner.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
#include "../debug.h"
#include "../network/network.h"
#include "../openttd.h"
#include "../core/random_func.hpp"
 
#include "../script/squirrel_class.hpp"
#include "../script/api/script_object.hpp"
#include "ai_info.hpp"
#include "ai_scanner.hpp"
 
#include "../safeguards.h"
 
 
AIScannerInfo::AIScannerInfo() :
  ScriptScanner(),
  info_dummy(nullptr)
{
}
 
void AIScannerInfo::Initialize()
{
  ScriptScanner::Initialize("AIScanner");
 
  ScriptAllocatorScope alloc_scope(this->engine);
 
  /* Create the dummy AI */
  this->main_script = "%_dummy";
  Script_CreateDummyInfo(this->engine->GetVM(), "AI", "ai");
}
 
void AIScannerInfo::SetDummyAI(class AIInfo *info)
{
  this->info_dummy = info;
}
 
AIScannerInfo::~AIScannerInfo()
{
  delete this->info_dummy;
}
 
std::string AIScannerInfo::GetScriptName(ScriptInfo *info)
{
  return info->GetName();
}
 
void AIScannerInfo::RegisterAPI(class Squirrel *engine)
{
  AIInfo::RegisterAPI(engine);
}
 
AIInfo *AIScannerInfo::SelectRandomAI() const
{
  if (_game_mode == GM_MENU) {
    Debug(script, 0, "The intro game should not use AI, loading 'dummy' AI.");
    return this->info_dummy;
  }
 
  uint num_random_ais = 0;
  for (const auto &item : info_single_list) {
    AIInfo *i = static_cast<AIInfo *>(item.second);
    if (i->UseAsRandomAI()) num_random_ais++;
  }
 
  if (num_random_ais == 0) {
    Debug(script, 0, "No suitable AI found, loading 'dummy' AI.");
    return this->info_dummy;
  }
 
  /* Find a random AI */
  uint pos = ScriptObject::GetRandomizer(OWNER_NONE).Next(num_random_ais);
 
  /* Find the Nth item from the array */
  ScriptInfoList::const_iterator it = this->info_single_list.begin();
 
#define GetAIInfo(it) static_cast<AIInfo *>((*it).second)
  while (!GetAIInfo(it)->UseAsRandomAI()) it++;
  for (; pos > 0; pos--) {
    it++;
    while (!GetAIInfo(it)->UseAsRandomAI()) it++;
  }
  return GetAIInfo(it);
#undef GetAIInfo
}
 
AIInfo *AIScannerInfo::FindInfo(const std::string &name, int version, bool force_exact_match)
{
  if (this->info_list.empty()) return nullptr;
  if (name.empty()) return nullptr;
 
  if (version == -1) {
    /* We want to load the latest version of this AI; so find it */
    auto it = this->info_single_list.find(name);
    if (it != this->info_single_list.end()) return static_cast<AIInfo *>(it->second);
    return nullptr;
  }
 
  if (force_exact_match) {
    /* Try to find a direct 'name.version' match */
    std::string name_with_version = fmt::format("{}.{}", name, version);
    auto it = this->info_list.find(name_with_version);
    if (it != this->info_list.end()) return static_cast<AIInfo *>(it->second);
    return nullptr;
  }
 
  AIInfo *info = nullptr;
  int highest_version = -1;
 
  /* See if there is a compatible AI which goes by that name, with the highest
   *  version which allows loading the requested version */
  for (const auto &item : this->info_list) {
    AIInfo *i = static_cast<AIInfo *>(item.second);
    if (StrEqualsIgnoreCase(name, i->GetName()) && i->CanLoadFromVersion(version) && (highest_version == -1 || i->GetVersion() > highest_version)) {
      highest_version = item.second->GetVersion();
      info = i;
    }
  }
 
  return info;
}
 
 
void AIScannerLibrary::Initialize()
{
  ScriptScanner::Initialize("AIScanner");
}
 
std::string AIScannerLibrary::GetScriptName(ScriptInfo *info)
{
  AILibrary *library = static_cast<AILibrary *>(info);
  return fmt::format("{}.{}", library->GetCategory(), library->GetInstanceName());
}
 
void AIScannerLibrary::RegisterAPI(class Squirrel *engine)
{
  AILibrary::RegisterAPI(engine);
}
 
AILibrary *AIScannerLibrary::FindLibrary(const std::string &library, int version)
{
  /* Internally we store libraries as 'library.version' */
  std::string library_name = fmt::format("{}.{}", library, version);
 
  /* Check if the library + version exists */
  ScriptInfoList::iterator it = this->info_list.find(library_name);
  if (it == this->info_list.end()) return nullptr;
 
  return static_cast<AILibrary *>((*it).second);
}