script_info.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 "../settings_type.h"
 
#include "squirrel_helper.hpp"
 
#include "script_info.hpp"
#include "script_scanner.hpp"
#include "../3rdparty/fmt/format.h"
 
#include "../safeguards.h"
 
bool ScriptInfo::CheckMethod(const char *name) const
{
  if (!this->engine->MethodExists(this->SQ_instance, name)) {
    this->engine->ThrowError(fmt::format("your info.nut/library.nut doesn't have the method '{}'", name));
    return false;
  }
  return true;
}
 
/* static */ SQInteger ScriptInfo::Constructor(HSQUIRRELVM vm, ScriptInfo *info)
{
  /* Set some basic info from the parent */
  Squirrel::GetInstance(vm, &info->SQ_instance, 2);
  /* Make sure the instance stays alive over time */
  sq_addref(vm, &info->SQ_instance);
 
  info->scanner = (ScriptScanner *)Squirrel::GetGlobalPointer(vm);
  info->engine = info->scanner->GetEngine();
 
  /* Ensure the mandatory functions exist */
  static const char * const required_functions[] = {
    "GetAuthor",
    "GetName",
    "GetShortName",
    "GetDescription",
    "GetVersion",
    "GetDate",
    "CreateInstance",
  };
  for (const auto &required_function : required_functions) {
    if (!info->CheckMethod(required_function)) return SQ_ERROR;
  }
 
  /* Get location information of the scanner */
  info->main_script = info->scanner->GetMainScript();
  info->tar_file = info->scanner->GetTarFile();
 
  /* Cache the data the info file gives us. */
  if (!info->engine->CallStringMethod(info->SQ_instance, "GetAuthor", &info->author, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallStringMethod(info->SQ_instance, "GetName", &info->name, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallStringMethod(info->SQ_instance, "GetShortName", &info->short_name, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallStringMethod(info->SQ_instance, "GetDescription", &info->description, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallStringMethod(info->SQ_instance, "GetDate", &info->date, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallIntegerMethod(info->SQ_instance, "GetVersion", &info->version, MAX_GET_OPS)) return SQ_ERROR;
  if (!info->engine->CallStringMethod(info->SQ_instance, "CreateInstance", &info->instance_name, MAX_CREATEINSTANCE_OPS)) return SQ_ERROR;
 
  /* The GetURL function is optional. */
  if (info->engine->MethodExists(info->SQ_instance, "GetURL")) {
    if (!info->engine->CallStringMethod(info->SQ_instance, "GetURL", &info->url, MAX_GET_OPS)) return SQ_ERROR;
  }
 
  /* Check if we have settings */
  if (info->engine->MethodExists(info->SQ_instance, "GetSettings")) {
    if (!info->GetSettings()) return SQ_ERROR;
  }
 
  return 0;
}
 
bool ScriptInfo::GetSettings()
{
  return this->engine->CallMethod(this->SQ_instance, "GetSettings", nullptr, MAX_GET_SETTING_OPS);
}
 
SQInteger ScriptInfo::AddSetting(HSQUIRRELVM vm)
{
  ScriptConfigItem config;
  uint items = 0;
 
  int medium_value = INT32_MIN;
 
  /* Read the table, and find all properties we care about */
  sq_pushnull(vm);
  while (SQ_SUCCEEDED(sq_next(vm, -2))) {
    const SQChar *key_string;
    if (SQ_FAILED(sq_getstring(vm, -2, &key_string))) return SQ_ERROR;
    std::string key = StrMakeValid(key_string);
 
    if (key == "name") {
      const SQChar *sqvalue;
      if (SQ_FAILED(sq_getstring(vm, -1, &sqvalue))) return SQ_ERROR;
 
      /* Don't allow '=' and ',' in configure setting names, as we need those
       *  2 chars to nicely store the settings as a string. */
      auto replace_with_underscore = [](auto c) { return c == '=' || c == ','; };
      config.name = StrMakeValid(sqvalue);
      std::replace_if(config.name.begin(), config.name.end(), replace_with_underscore, '_');
      items |= 0x001;
    } else if (key == "description") {
      const SQChar *sqdescription;
      if (SQ_FAILED(sq_getstring(vm, -1, &sqdescription))) return SQ_ERROR;
      config.description = StrMakeValid(sqdescription);
      items |= 0x002;
    } else if (key == "min_value") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      config.min_value = ClampTo<int32_t>(res);
      items |= 0x004;
    } else if (key == "max_value") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      config.max_value = ClampTo<int32_t>(res);
      items |= 0x008;
    } else if (key == "easy_value") {
      // No longer parsed.
      items |= 0x010;
    } else if (key == "medium_value") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      medium_value = ClampTo<int32_t>(res);
      items |= 0x020;
    } else if (key == "hard_value") {
      // No longer parsed.
      items |= 0x040;
    } else if (key == "custom_value") {
      // No longer parsed.
    } else if (key == "default_value") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      config.default_value = ClampTo<int32_t>(res);
      items |= 0x080;
    } else if (key == "random_deviation") {
      // No longer parsed.
    } else if (key == "step_size") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      config.step_size = ClampTo<int32_t>(res);
    } else if (key == "flags") {
      SQInteger res;
      if (SQ_FAILED(sq_getinteger(vm, -1, &res))) return SQ_ERROR;
      config.flags = (ScriptConfigFlags)res;
      items |= 0x100;
    } else {
      this->engine->ThrowError(fmt::format("unknown setting property '{}'", key));
      return SQ_ERROR;
    }
 
    sq_pop(vm, 2);
  }
  sq_pop(vm, 1);
 
  /* Check if default_value is set. Although required, this was changed with
   * 14.0, and as such, older AIs don't use it yet. So we convert the older
   * values into a default_value. */
  if ((items & 0x080) == 0) {
    /* Easy/medium/hard should all three be defined. */
    if ((items & 0x010) == 0 || (items & 0x020) == 0 || (items & 0x040) == 0) {
      this->engine->ThrowError("please define all properties of a setting (min/max not allowed for booleans)");
      return SQ_ERROR;
    }
 
    config.default_value = medium_value;
    items |= 0x080;
  } else {
    /* For compatibility, also act like the default sets the easy/medium/hard. */
    items |= 0x010 | 0x020 | 0x040;
  }
 
  /* Make sure all properties are defined */
  uint mask = (config.flags & SCRIPTCONFIG_BOOLEAN) ? 0x1F3 : 0x1FF;
  if (items != mask) {
    this->engine->ThrowError("please define all properties of a setting (min/max not allowed for booleans)");
    return SQ_ERROR;
  }
 
  this->config_list.emplace_back(config);
  return 0;
}
 
SQInteger ScriptInfo::AddLabels(HSQUIRRELVM vm)
{
  const SQChar *setting_name_str;
  if (SQ_FAILED(sq_getstring(vm, -2, &setting_name_str))) return SQ_ERROR;
  std::string setting_name = StrMakeValid(setting_name_str);
 
  ScriptConfigItem *config = nullptr;
  for (auto &item : this->config_list) {
    if (item.name == setting_name) config = &item;
  }
 
  if (config == nullptr) {
    this->engine->ThrowError(fmt::format("Trying to add labels for non-defined setting '{}'", setting_name));
    return SQ_ERROR;
  }
  if (!config->labels.empty()) return SQ_ERROR;
 
  /* Read the table and find all labels */
  sq_pushnull(vm);
  while (SQ_SUCCEEDED(sq_next(vm, -2))) {
    const SQChar *key_string;
    const SQChar *label;
    if (SQ_FAILED(sq_getstring(vm, -2, &key_string))) return SQ_ERROR;
    if (SQ_FAILED(sq_getstring(vm, -1, &label))) return SQ_ERROR;
    /* Because squirrel doesn't support identifiers starting with a digit,
     * we skip the first character. */
    key_string++;
    int sign = 1;
    if (*key_string == '_') {
      /* When the second character is '_', it indicates the value is negative. */
      sign = -1;
      key_string++;
    }
    int key = atoi(key_string) * sign;
    config->labels[key] = StrMakeValid(label);
 
    sq_pop(vm, 2);
  }
  sq_pop(vm, 1);
 
  /* Check labels for completeness */
  config->complete_labels = true;
  for (int value = config->min_value; value <= config->max_value; value++) {
    if (config->labels.find(value) == config->labels.end()) {
      config->complete_labels = false;
      break;
    }
  }
 
  return 0;
}
 
const ScriptConfigItemList *ScriptInfo::GetConfigList() const
{
  return &this->config_list;
}
 
const ScriptConfigItem *ScriptInfo::GetConfigItem(const std::string_view name) const
{
  for (const auto &item : this->config_list) {
    if (item.name == name) return &item;
  }
  return nullptr;
}
 
int ScriptInfo::GetSettingDefaultValue(const std::string &name) const
{
  for (const auto &item : this->config_list) {
    if (item.name != name) continue;
    return item.default_value;
  }
 
  /* There is no such setting */
  return -1;
}