newgrf_text.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 "newgrf.h"
#include "strings_internal.h"
#include "newgrf_storage.h"
#include "newgrf_text.h"
#include "newgrf_cargo.h"
#include "string_func.h"
#include "timer/timer_game_calendar.h"
#include "debug.h"
#include "core/alloc_type.hpp"
#include "language.h"
#include <sstream>
 
#include "table/strings.h"
#include "table/control_codes.h"
 
#include "safeguards.h"
 
enum GRFBaseLanguages {
  GRFLB_AMERICAN    = 0x01,
  GRFLB_ENGLISH     = 0x02,
  GRFLB_GERMAN      = 0x04,
  GRFLB_FRENCH      = 0x08,
  GRFLB_SPANISH     = 0x10,
  GRFLB_GENERIC     = 0x80,
};
 
enum GRFExtendedLanguages {
  GRFLX_AMERICAN    = 0x00,
  GRFLX_ENGLISH     = 0x01,
  GRFLX_GERMAN      = 0x02,
  GRFLX_FRENCH      = 0x03,
  GRFLX_SPANISH     = 0x04,
  GRFLX_UNSPECIFIED = 0x7F,
};
 
 
struct GRFTextEntry {
  GRFTextList textholder;
  StringID def_string;
  uint32_t grfid;
  uint16_t stringid;
};
 
 
static std::vector<GRFTextEntry> _grf_text;
static uint8_t _currentLangID = GRFLX_ENGLISH;  
 
int LanguageMap::GetMapping(int newgrf_id, bool gender) const
{
  const std::vector<Mapping> &map = gender ? this->gender_map : this->case_map;
  for (const Mapping &m : map) {
    if (m.newgrf_id == newgrf_id) return m.openttd_id;
  }
  return -1;
}
 
int LanguageMap::GetReverseMapping(int openttd_id, bool gender) const
{
  const std::vector<Mapping> &map = gender ? this->gender_map : this->case_map;
  for (const Mapping &m : map) {
    if (m.openttd_id == openttd_id) return m.newgrf_id;
  }
  return -1;
}
 
struct UnmappedChoiceList {
  UnmappedChoiceList(StringControlCode type, int offset) :
    type(type), offset(offset)
  {
  }
 
  StringControlCode type; 
  int offset;             
 
  std::map<uint8_t, std::stringstream> strings;
 
  void Flush(const LanguageMap *lm, std::ostringstream &dest)
  {
    if (this->strings.find(0) == this->strings.end()) {
      /* In case of a (broken) NewGRF without a default,
       * assume an empty string. */
      GrfMsg(1, "choice list misses default value");
      this->strings[0] = std::stringstream();
    }
 
    std::ostreambuf_iterator<char> d(dest);
 
    if (lm == nullptr) {
      /* In case there is no mapping, just ignore everything but the default.
       * A probable cause for this happening is when the language file has
       * been removed by the user and as such no mapping could be made. */
      dest << this->strings[0].rdbuf();
      return;
    }
 
    Utf8Encode(d, this->type);
 
    if (this->type == SCC_SWITCH_CASE) {
      /*
       * Format for case switch:
       * <NUM CASES> <CASE1> <LEN1> <STRING1> <CASE2> <LEN2> <STRING2> <CASE3> <LEN3> <STRING3> <STRINGDEFAULT>
       * Each LEN is printed using 2 bytes in big endian order.
       */
 
      /* "<NUM CASES>" */
      int count = 0;
      for (uint8_t i = 0; i < _current_language->num_cases; i++) {
        /* Count the ones we have a mapped string for. */
        if (this->strings.find(lm->GetReverseMapping(i, false)) != this->strings.end()) count++;
      }
      *d++ = count;
 
      for (uint8_t i = 0; i < _current_language->num_cases; i++) {
        /* Resolve the string we're looking for. */
        int idx = lm->GetReverseMapping(i, false);
        if (this->strings.find(idx) == this->strings.end()) continue;
        auto str = this->strings[idx].str();
 
        /* "<CASEn>" */
        *d++ = i + 1;
 
        /* "<LENn>": Limit the length of the string to 0xFFFE to leave space for the '\0'. */
        size_t len = std::min<size_t>(0xFFFE, str.size());
        *d++ = GB(len + 1, 8, 8);
        *d++ = GB(len + 1, 0, 8);
 
        /* "<STRINGn>" */
        dest.write(str.c_str(), len);
        *d++ = '\0';
      }
 
      /* "<STRINGDEFAULT>" */
      dest << this->strings[0].rdbuf() << '\0';
    } else {
      if (this->type == SCC_PLURAL_LIST) {
        *d++ = lm->plural_form;
      }
 
      /*
       * Format for choice list:
       * <OFFSET> <NUM CHOICES> <LENs> <STRINGs>
       */
 
      /* "<OFFSET>" */
      *d++ = this->offset - 0x80;
 
      /* "<NUM CHOICES>" */
      int count = (this->type == SCC_GENDER_LIST ? _current_language->num_genders : LANGUAGE_MAX_PLURAL_FORMS);
      *d++ = count;
 
      /* "<LENs>" */
      for (int i = 0; i < count; i++) {
        int idx = (this->type == SCC_GENDER_LIST ? lm->GetReverseMapping(i, true) : i + 1);
        const auto &str = this->strings[this->strings.find(idx) != this->strings.end() ? idx : 0].str();
        size_t len = str.size() + 1;
        if (len > 0xFF) GrfMsg(1, "choice list string is too long");
        *d++ = GB(len, 0, 8);
      }
 
      /* "<STRINGs>" */
      for (int i = 0; i < count; i++) {
        int idx = (this->type == SCC_GENDER_LIST ? lm->GetReverseMapping(i, true) : i + 1);
        const auto &str = this->strings[this->strings.find(idx) != this->strings.end() ? idx : 0].str();
        /* Limit the length of the string we copy to 0xFE. The length is written above
         * as a byte and we need room for the final '\0'. */
        size_t len = std::min<size_t>(0xFE, str.size());
        dest.write(str.c_str(), len);
        *d++ = '\0';
      }
    }
  }
};
 
std::string TranslateTTDPatchCodes(uint32_t grfid, uint8_t language_id, bool allow_newlines, std::string_view str, StringControlCode byte80)
{
  /* Empty input string? Nothing to do here. */
  if (str.empty()) return {};
 
  std::string_view::const_iterator src = str.cbegin();
 
  /* Is this an unicode string? */
  bool unicode = false;
  char32_t marker;
  size_t len = Utf8Decode(&marker, &*src);
 
  if (marker == NFO_UTF8_IDENTIFIER) {
    unicode = true;
    src += len;
  }
 
  /* Helper variable for a possible (string) mapping. */
  UnmappedChoiceList *mapping = nullptr;
 
  std::ostringstream dest;
  std::ostreambuf_iterator<char> d(dest);
  while (src != str.cend()) {
    char32_t c;
 
    if (unicode && Utf8EncodedCharLen(*src) != 0) {
      c = Utf8Consume(src);
      /* 'Magic' range of control codes. */
      if (GB(c, 8, 8) == 0xE0) {
        c = GB(c, 0, 8);
      } else if (c >= 0x20) {
        if (!IsValidChar(c, CS_ALPHANUMERAL)) c = '?';
        Utf8Encode(d, c);
        continue;
      }
    } else {
      c = static_cast<uint8_t>(*src++);
    }
 
    if (c == '\0') break;
 
    switch (c) {
      case 0x01:
        if (*src == '\0') goto string_end;
        Utf8Encode(d, ' ');
        src++;
        break;
      case 0x0A: break;
      case 0x0D:
        if (allow_newlines) {
          *d++ = 0x0A;
        } else {
          GrfMsg(1, "Detected newline in string that does not allow one");
        }
        break;
      case 0x0E: Utf8Encode(d, SCC_TINYFONT); break;
      case 0x0F: Utf8Encode(d, SCC_BIGFONT); break;
      case 0x1F:
        if (src[0] == '\0' || src[1] == '\0') goto string_end;
        Utf8Encode(d, ' ');
        src += 2;
        break;
      case 0x7B:
      case 0x7C:
      case 0x7D:
      case 0x7E:
      case 0x7F: Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD_SIGNED + c - 0x7B); break;
      case 0x80: Utf8Encode(d, byte80); break;
      case 0x81:
      {
        if (src[0] == '\0' || src[1] == '\0') goto string_end;
        StringID string;
        string = static_cast<uint8_t>(*src++);
        string |= static_cast<uint8_t>(*src++) << 8;
        Utf8Encode(d, SCC_NEWGRF_STRINL);
        Utf8Encode(d, MapGRFStringID(grfid, string));
        break;
      }
      case 0x82:
      case 0x83:
      case 0x84: Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_DATE_LONG + c - 0x82); break;
      case 0x85: Utf8Encode(d, SCC_NEWGRF_DISCARD_WORD);       break;
      case 0x86: Utf8Encode(d, SCC_NEWGRF_ROTATE_TOP_4_WORDS); break;
      case 0x87: Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_VOLUME_LONG);  break;
      case 0x88: Utf8Encode(d, SCC_BLUE);    break;
      case 0x89: Utf8Encode(d, SCC_SILVER);  break;
      case 0x8A: Utf8Encode(d, SCC_GOLD);    break;
      case 0x8B: Utf8Encode(d, SCC_RED);     break;
      case 0x8C: Utf8Encode(d, SCC_PURPLE);  break;
      case 0x8D: Utf8Encode(d, SCC_LTBROWN); break;
      case 0x8E: Utf8Encode(d, SCC_ORANGE);  break;
      case 0x8F: Utf8Encode(d, SCC_GREEN);   break;
      case 0x90: Utf8Encode(d, SCC_YELLOW);  break;
      case 0x91: Utf8Encode(d, SCC_DKGREEN); break;
      case 0x92: Utf8Encode(d, SCC_CREAM);   break;
      case 0x93: Utf8Encode(d, SCC_BROWN);   break;
      case 0x94: Utf8Encode(d, SCC_WHITE);   break;
      case 0x95: Utf8Encode(d, SCC_LTBLUE);  break;
      case 0x96: Utf8Encode(d, SCC_GRAY);    break;
      case 0x97: Utf8Encode(d, SCC_DKBLUE);  break;
      case 0x98: Utf8Encode(d, SCC_BLACK);   break;
      case 0x9A:
      {
        int code = *src++;
        switch (code) {
          case 0x00: goto string_end;
          case 0x01: Utf8Encode(d, SCC_NEWGRF_PRINT_QWORD_CURRENCY); break;
            /* 0x02: ignore next colour byte is not supported. It works on the final
             * string and as such hooks into the string drawing routine. At that
             * point many things already happened, such as splitting up of strings
             * when drawn over multiple lines or right-to-left translations, which
             * make the behaviour peculiar, e.g. only happening at specific width
             * of windows. Or we need to add another pass over the string to just
             * support this. As such it is not implemented in OpenTTD. */
          case 0x03:
          {
            if (src[0] == '\0' || src[1] == '\0') goto string_end;
            uint16_t tmp = static_cast<uint8_t>(*src++);
            tmp |= static_cast<uint8_t>(*src++) << 8;
            Utf8Encode(d, SCC_NEWGRF_PUSH_WORD);
            Utf8Encode(d, tmp);
            break;
          }
          case 0x06: Utf8Encode(d, SCC_NEWGRF_PRINT_BYTE_HEX);          break;
          case 0x07: Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_HEX);          break;
          case 0x08: Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD_HEX);         break;
          /* 0x09, 0x0A are TTDPatch internal use only string codes. */
          case 0x0B: Utf8Encode(d, SCC_NEWGRF_PRINT_QWORD_HEX);         break;
          case 0x0C: Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_STATION_NAME); break;
          case 0x0D: Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_WEIGHT_LONG);  break;
          case 0x0E:
          case 0x0F:
          {
            if (str[0] == '\0') goto string_end;
            const LanguageMap *lm = LanguageMap::GetLanguageMap(grfid, language_id);
            int index = *src++;
            int mapped = lm != nullptr ? lm->GetMapping(index, code == 0x0E) : -1;
            if (mapped >= 0) {
              Utf8Encode(d, code == 0x0E ? SCC_GENDER_INDEX : SCC_SET_CASE);
              Utf8Encode(d, code == 0x0E ? mapped : mapped + 1);
            }
            break;
          }
 
          case 0x10:
          case 0x11:
            if (str[0] == '\0') goto string_end;
            if (mapping == nullptr) {
              if (code == 0x10) src++; // Skip the index
              GrfMsg(1, "choice list {} marker found when not expected", code == 0x10 ? "next" : "default");
              break;
            } else {
              int index = (code == 0x10 ? *src++ : 0);
              if (mapping->strings.find(index) != mapping->strings.end()) {
                GrfMsg(1, "duplicate choice list string, ignoring");
              } else {
                d = std::ostreambuf_iterator<char>(mapping->strings[index]);
              }
            }
            break;
 
          case 0x12:
            if (mapping == nullptr) {
              GrfMsg(1, "choice list end marker found when not expected");
            } else {
              /* Now we can start flushing everything and clean everything up. */
              mapping->Flush(LanguageMap::GetLanguageMap(grfid, language_id), dest);
              delete mapping;
              mapping = nullptr;
 
              d = std::ostreambuf_iterator<char>(dest);
            }
            break;
 
          case 0x13:
          case 0x14:
          case 0x15:
            if (src[0] == '\0') goto string_end;
            if (mapping != nullptr) {
              GrfMsg(1, "choice lists can't be stacked, it's going to get messy now...");
              if (code != 0x14) src++;
            } else {
              static const StringControlCode mp[] = { SCC_GENDER_LIST, SCC_SWITCH_CASE, SCC_PLURAL_LIST };
              mapping = new UnmappedChoiceList(mp[code - 0x13], code == 0x14 ? 0 : *src++);
            }
            break;
 
          case 0x16:
          case 0x17:
          case 0x18:
          case 0x19:
          case 0x1A:
          case 0x1B:
          case 0x1C:
          case 0x1D:
          case 0x1E:
            Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD_DATE_LONG + code - 0x16);
            break;
 
          case 0x1F: Utf8Encode(d, SCC_PUSH_COLOUR); break;
          case 0x20: Utf8Encode(d, SCC_POP_COLOUR);  break;
 
          case 0x21: Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD_FORCE); break;
 
          default:
            GrfMsg(1, "missing handler for extended format code");
            break;
        }
        break;
      }
 
      case 0x9E: Utf8Encode(d, 0x20AC);               break; // Euro
      case 0x9F: Utf8Encode(d, 0x0178);               break; // Y with diaeresis
      case 0xA0: Utf8Encode(d, SCC_UP_ARROW);         break;
      case 0xAA: Utf8Encode(d, SCC_DOWN_ARROW);       break;
      case 0xAC: Utf8Encode(d, SCC_CHECKMARK);        break;
      case 0xAD: Utf8Encode(d, SCC_CROSS);            break;
      case 0xAF: Utf8Encode(d, SCC_RIGHT_ARROW);      break;
      case 0xB4: Utf8Encode(d, SCC_TRAIN);            break;
      case 0xB5: Utf8Encode(d, SCC_LORRY);            break;
      case 0xB6: Utf8Encode(d, SCC_BUS);              break;
      case 0xB7: Utf8Encode(d, SCC_PLANE);            break;
      case 0xB8: Utf8Encode(d, SCC_SHIP);             break;
      case 0xB9: Utf8Encode(d, SCC_SUPERSCRIPT_M1);   break;
      case 0xBC: Utf8Encode(d, SCC_SMALL_UP_ARROW);   break;
      case 0xBD: Utf8Encode(d, SCC_SMALL_DOWN_ARROW); break;
      default:
        /* Validate any unhandled character */
        if (!IsValidChar(c, CS_ALPHANUMERAL)) c = '?';
        Utf8Encode(d, c);
        break;
    }
  }
 
string_end:
  if (mapping != nullptr) {
    GrfMsg(1, "choice list was incomplete, the whole list is ignored");
    delete mapping;
  }
 
  return dest.str();
}
 
static void AddGRFTextToList(GRFTextList &list, uint8_t langid, std::string_view text_to_add)
{
  /* Loop through all languages and see if we can replace a string */
  for (auto &text : list) {
    if (text.langid == langid) {
      text.text = text_to_add;
      return;
    }
  }
 
  /* If a string wasn't replaced, then we must append the new string */
  list.push_back(GRFText{ langid, std::string(text_to_add) });
}
 
void AddGRFTextToList(GRFTextList &list, uint8_t langid, uint32_t grfid, bool allow_newlines, std::string_view text_to_add)
{
  AddGRFTextToList(list, langid, TranslateTTDPatchCodes(grfid, langid, allow_newlines, text_to_add));
}
 
void AddGRFTextToList(GRFTextWrapper &list, uint8_t langid, uint32_t grfid, bool allow_newlines, std::string_view text_to_add)
{
  if (list == nullptr) list = std::make_shared<GRFTextList>();
  AddGRFTextToList(*list, langid, grfid, allow_newlines, text_to_add);
}
 
void AddGRFTextToList(GRFTextWrapper &list, std::string_view text_to_add)
{
  if (list == nullptr) list = std::make_shared<GRFTextList>();
  AddGRFTextToList(*list, GRFLX_UNSPECIFIED, text_to_add);
}
 
StringID AddGRFString(uint32_t grfid, uint16_t stringid, uint8_t langid_to_add, bool new_scheme, bool allow_newlines, std::string_view text_to_add, StringID def_string)
{
  /* When working with the old language scheme (grf_version is less than 7) and
   * English or American is among the set bits, simply add it as English in
   * the new scheme, i.e. as langid = 1.
   * If English is set, it is pretty safe to assume the translations are not
   * actually translated.
   */
  if (!new_scheme) {
    if (langid_to_add & (GRFLB_AMERICAN | GRFLB_ENGLISH)) {
      langid_to_add = GRFLX_ENGLISH;
    } else {
      StringID ret = STR_EMPTY;
      if (langid_to_add & GRFLB_GERMAN)  ret = AddGRFString(grfid, stringid, GRFLX_GERMAN,  true, allow_newlines, text_to_add, def_string);
      if (langid_to_add & GRFLB_FRENCH)  ret = AddGRFString(grfid, stringid, GRFLX_FRENCH,  true, allow_newlines, text_to_add, def_string);
      if (langid_to_add & GRFLB_SPANISH) ret = AddGRFString(grfid, stringid, GRFLX_SPANISH, true, allow_newlines, text_to_add, def_string);
      return ret;
    }
  }
 
  auto it = std::ranges::find_if(_grf_text, [&grfid, &stringid](const GRFTextEntry &grf_text) { return grf_text.grfid == grfid && grf_text.stringid == stringid; });
  if (it == std::end(_grf_text)) {
    /* Too many strings allocated, return empty. */
    if (_grf_text.size() == TAB_SIZE_NEWGRF) return STR_EMPTY;
 
    /* We didn't find our stringid and grfid in the list, allocate a new id. */
    it = _grf_text.emplace(std::end(_grf_text));
    it->grfid      = grfid;
    it->stringid   = stringid;
    it->def_string = def_string;
  }
  uint id = static_cast<uint>(it - std::begin(_grf_text));
 
  std::string newtext = TranslateTTDPatchCodes(grfid, langid_to_add, allow_newlines, text_to_add);
  AddGRFTextToList(it->textholder, langid_to_add, newtext);
 
  GrfMsg(3, "Added 0x{:X} grfid {:08X} string 0x{:X} lang 0x{:X} string '{}' ({:X})", id, grfid, stringid, langid_to_add, newtext, MakeStringID(TEXT_TAB_NEWGRF_START, id));
 
  return MakeStringID(TEXT_TAB_NEWGRF_START, id);
}
 
StringID GetGRFStringID(uint32_t grfid, StringID stringid)
{
  auto it = std::ranges::find_if(_grf_text, [&grfid, &stringid](const GRFTextEntry &grf_text) { return grf_text.grfid == grfid && grf_text.stringid == stringid; });
  if (it != std::end(_grf_text)) {
    uint id = static_cast<uint>(it - std::begin(_grf_text));
    return MakeStringID(TEXT_TAB_NEWGRF_START, id);
  }
 
  return STR_UNDEFINED;
}
 
 
const char *GetGRFStringFromGRFText(const GRFTextList &text_list)
{
  const char *default_text = nullptr;
 
  /* Search the list of lang-strings of this stringid for current lang */
  for (const auto &text : text_list) {
    if (text.langid == _currentLangID) return text.text.c_str();
 
    /* If the current string is English or American, set it as the
     * fallback language if the specific language isn't available. */
    if (text.langid == GRFLX_UNSPECIFIED || (default_text == nullptr && (text.langid == GRFLX_ENGLISH || text.langid == GRFLX_AMERICAN))) {
      default_text = text.text.c_str();
    }
  }
 
  return default_text;
}
 
const char *GetGRFStringFromGRFText(const GRFTextWrapper &text)
{
  return text ? GetGRFStringFromGRFText(*text) : nullptr;
}
 
const char *GetGRFStringPtr(uint32_t stringid)
{
  assert(stringid < _grf_text.size());
  assert(_grf_text[stringid].grfid != 0);
 
  const char *str = GetGRFStringFromGRFText(_grf_text[stringid].textholder);
  if (str != nullptr) return str;
 
  /* Use the default string ID if the fallback string isn't available */
  return GetStringPtr(_grf_text[stringid].def_string);
}
 
void SetCurrentGrfLangID(uint8_t language_id)
{
  _currentLangID = language_id;
}
 
bool CheckGrfLangID(uint8_t lang_id, uint8_t grf_version)
{
  if (grf_version < 7) {
    switch (_currentLangID) {
      case GRFLX_GERMAN:  return (lang_id & GRFLB_GERMAN)  != 0;
      case GRFLX_FRENCH:  return (lang_id & GRFLB_FRENCH)  != 0;
      case GRFLX_SPANISH: return (lang_id & GRFLB_SPANISH) != 0;
      default:            return (lang_id & (GRFLB_ENGLISH | GRFLB_AMERICAN)) != 0;
    }
  }
 
  return (lang_id == _currentLangID || lang_id == GRFLX_UNSPECIFIED);
}
 
void CleanUpStrings()
{
  _grf_text.clear();
}
 
struct TextRefStack {
  std::array<uint8_t, 0x30> stack;
  uint8_t position;
  const GRFFile *grffile;
  bool used;
 
  TextRefStack() : position(0), grffile(nullptr), used(false) {}
 
  uint8_t  PopUnsignedByte()  { assert(this->position < this->stack.size()); return this->stack[this->position++]; }
  int8_t   PopSignedByte()    { return (int8_t)this->PopUnsignedByte(); }
 
  uint16_t PopUnsignedWord()
  {
    uint16_t val = this->PopUnsignedByte();
    return val | (this->PopUnsignedByte() << 8);
  }
  int16_t  PopSignedWord()    { return (int32_t)this->PopUnsignedWord(); }
 
  uint32_t PopUnsignedDWord()
  {
    uint32_t val = this->PopUnsignedWord();
    return val | (this->PopUnsignedWord() << 16);
  }
  int32_t  PopSignedDWord()   { return (int32_t)this->PopUnsignedDWord(); }
 
  uint64_t PopUnsignedQWord()
  {
    uint64_t val = this->PopUnsignedDWord();
    return val | (((uint64_t)this->PopUnsignedDWord()) << 32);
  }
  int64_t  PopSignedQWord()   { return (int64_t)this->PopUnsignedQWord(); }
 
  void RotateTop4Words()
  {
    uint8_t tmp[2];
    for (int i = 0; i  < 2; i++) tmp[i] = this->stack[this->position + i + 6];
    for (int i = 5; i >= 0; i--) this->stack[this->position + i + 2] = this->stack[this->position + i];
    for (int i = 0; i  < 2; i++) this->stack[this->position + i] = tmp[i];
  }
 
  void PushWord(uint16_t word)
  {
    if (this->position >= 2) {
      this->position -= 2;
    } else {
      // Rotate right 2 positions
      std::rotate(this->stack.rbegin(), this->stack.rbegin() + 2, this->stack.rend());
    }
    this->stack[this->position]     = GB(word, 0, 8);
    this->stack[this->position + 1] = GB(word, 8, 8);
  }
 
  void ResetStack(const GRFFile *grffile)
  {
    assert(grffile != nullptr);
    this->position = 0;
    this->grffile = grffile;
    this->used = true;
  }
};
 
static TextRefStack _newgrf_textrefstack;
 
bool UsingNewGRFTextStack()
{
  return _newgrf_textrefstack.used;
}
 
struct TextRefStack *CreateTextRefStackBackup()
{
  return new TextRefStack(_newgrf_textrefstack);
}
 
void RestoreTextRefStackBackup(struct TextRefStack *backup)
{
  _newgrf_textrefstack = *backup;
  delete backup;
}
 
void StartTextRefStackUsage(const GRFFile *grffile, uint8_t numEntries, const uint32_t *values)
{
  extern TemporaryStorageArray<int32_t, 0x110> _temp_store;
 
  _newgrf_textrefstack.ResetStack(grffile);
 
  auto stack_it = _newgrf_textrefstack.stack.begin();
  for (uint i = 0; i < numEntries; i++) {
    uint32_t value = values != nullptr ? values[i] : _temp_store.GetValue(0x100 + i);
    for (uint j = 0; j < 32; j += 8) {
      *stack_it = GB(value, j, 8);
      stack_it++;
    }
  }
}
 
void StopTextRefStackUsage()
{
  _newgrf_textrefstack.used = false;
}
 
char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str, StringParameters &parameters, bool modify_parameters)
{
  switch (scc) {
    default: break;
 
    /* These control codes take one string parameter, check there are at least that many available. */
    case SCC_NEWGRF_PRINT_DWORD_SIGNED:
    case SCC_NEWGRF_PRINT_WORD_SIGNED:
    case SCC_NEWGRF_PRINT_BYTE_SIGNED:
    case SCC_NEWGRF_PRINT_WORD_UNSIGNED:
    case SCC_NEWGRF_PRINT_BYTE_HEX:
    case SCC_NEWGRF_PRINT_WORD_HEX:
    case SCC_NEWGRF_PRINT_DWORD_HEX:
    case SCC_NEWGRF_PRINT_QWORD_HEX:
    case SCC_NEWGRF_PRINT_DWORD_CURRENCY:
    case SCC_NEWGRF_PRINT_QWORD_CURRENCY:
    case SCC_NEWGRF_PRINT_WORD_STRING_ID:
    case SCC_NEWGRF_PRINT_WORD_DATE_LONG:
    case SCC_NEWGRF_PRINT_DWORD_DATE_LONG:
    case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:
    case SCC_NEWGRF_PRINT_DWORD_DATE_SHORT:
    case SCC_NEWGRF_PRINT_WORD_SPEED:
    case SCC_NEWGRF_PRINT_WORD_VOLUME_LONG:
    case SCC_NEWGRF_PRINT_WORD_VOLUME_SHORT:
    case SCC_NEWGRF_PRINT_WORD_WEIGHT_LONG:
    case SCC_NEWGRF_PRINT_WORD_WEIGHT_SHORT:
    case SCC_NEWGRF_PRINT_WORD_POWER:
    case SCC_NEWGRF_PRINT_DWORD_FORCE:
    case SCC_NEWGRF_PRINT_WORD_STATION_NAME:
    case SCC_NEWGRF_PRINT_WORD_CARGO_NAME:
      if (parameters.GetDataLeft() < 1) {
        Debug(misc, 0, "Too many NewGRF string parameters.");
        return 0;
      }
      break;
 
    /* These string code take two string parameters, check there are at least that many available. */
    case SCC_NEWGRF_PRINT_WORD_CARGO_LONG:
    case SCC_NEWGRF_PRINT_WORD_CARGO_SHORT:
    case SCC_NEWGRF_PRINT_WORD_CARGO_TINY:
      if (parameters.GetDataLeft() < 2) {
        Debug(misc, 0, "Too many NewGRF string parameters.");
        return 0;
      }
      break;
  }
 
  if (_newgrf_textrefstack.used && modify_parameters) {
    /* There is data on the NewGRF text stack, and we want to move them to OpenTTD's string stack.
     * After this call, a new call is made with `modify_parameters` set to false when the string is finally formatted. */
    switch (scc) {
      default: NOT_REACHED();
      case SCC_NEWGRF_PRINT_BYTE_SIGNED:      parameters.SetParam(0, _newgrf_textrefstack.PopSignedByte());    break;
      case SCC_NEWGRF_PRINT_QWORD_CURRENCY:   parameters.SetParam(0, _newgrf_textrefstack.PopSignedQWord());   break;
 
      case SCC_NEWGRF_PRINT_DWORD_CURRENCY:
      case SCC_NEWGRF_PRINT_DWORD_SIGNED:     parameters.SetParam(0, _newgrf_textrefstack.PopSignedDWord());   break;
 
      case SCC_NEWGRF_PRINT_BYTE_HEX:         parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedByte());  break;
      case SCC_NEWGRF_PRINT_QWORD_HEX:        parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedQWord()); break;
 
      case SCC_NEWGRF_PRINT_WORD_SPEED:
      case SCC_NEWGRF_PRINT_WORD_VOLUME_LONG:
      case SCC_NEWGRF_PRINT_WORD_VOLUME_SHORT:
      case SCC_NEWGRF_PRINT_WORD_SIGNED:      parameters.SetParam(0, _newgrf_textrefstack.PopSignedWord());    break;
 
      case SCC_NEWGRF_PRINT_WORD_HEX:
      case SCC_NEWGRF_PRINT_WORD_WEIGHT_LONG:
      case SCC_NEWGRF_PRINT_WORD_WEIGHT_SHORT:
      case SCC_NEWGRF_PRINT_WORD_POWER:
      case SCC_NEWGRF_PRINT_WORD_STATION_NAME:
      case SCC_NEWGRF_PRINT_WORD_UNSIGNED:    parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedWord());  break;
 
      case SCC_NEWGRF_PRINT_DWORD_FORCE:
      case SCC_NEWGRF_PRINT_DWORD_DATE_LONG:
      case SCC_NEWGRF_PRINT_DWORD_DATE_SHORT:
      case SCC_NEWGRF_PRINT_DWORD_HEX:        parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedDWord()); break;
 
      /* Dates from NewGRFs have 1920-01-01 as their zero point, convert it to OpenTTD's epoch. */
      case SCC_NEWGRF_PRINT_WORD_DATE_LONG:
      case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:  parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedWord() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); break;
 
      case SCC_NEWGRF_DISCARD_WORD:           _newgrf_textrefstack.PopUnsignedWord(); break;
 
      case SCC_NEWGRF_ROTATE_TOP_4_WORDS:     _newgrf_textrefstack.RotateTop4Words(); break;
      case SCC_NEWGRF_PUSH_WORD:              _newgrf_textrefstack.PushWord(Utf8Consume(str)); break;
 
      case SCC_NEWGRF_PRINT_WORD_CARGO_LONG:
      case SCC_NEWGRF_PRINT_WORD_CARGO_SHORT:
      case SCC_NEWGRF_PRINT_WORD_CARGO_TINY:
        parameters.SetParam(0, GetCargoTranslation(_newgrf_textrefstack.PopUnsignedWord(), _newgrf_textrefstack.grffile));
        parameters.SetParam(1, _newgrf_textrefstack.PopUnsignedWord());
        break;
 
      case SCC_NEWGRF_PRINT_WORD_STRING_ID:
        parameters.SetParam(0, MapGRFStringID(_newgrf_textrefstack.grffile->grfid, _newgrf_textrefstack.PopUnsignedWord()));
        break;
 
      case SCC_NEWGRF_PRINT_WORD_CARGO_NAME: {
        CargoID cargo = GetCargoTranslation(_newgrf_textrefstack.PopUnsignedWord(), _newgrf_textrefstack.grffile);
        parameters.SetParam(0, cargo < NUM_CARGO ? 1ULL << cargo : 0);
        break;
      }
    }
  } else {
    /* Consume additional parameter characters that follow the NewGRF string code. */
    switch (scc) {
      default: break;
 
      case SCC_NEWGRF_PUSH_WORD:
        Utf8Consume(str);
        break;
    }
  }
 
  /* Emit OpenTTD's internal string code for the different NewGRF variants. */
  switch (scc) {
    default: NOT_REACHED();
    case SCC_NEWGRF_PRINT_DWORD_SIGNED:
    case SCC_NEWGRF_PRINT_WORD_SIGNED:
    case SCC_NEWGRF_PRINT_BYTE_SIGNED:
    case SCC_NEWGRF_PRINT_WORD_UNSIGNED:
      return SCC_COMMA;
 
    case SCC_NEWGRF_PRINT_BYTE_HEX:
    case SCC_NEWGRF_PRINT_WORD_HEX:
    case SCC_NEWGRF_PRINT_DWORD_HEX:
    case SCC_NEWGRF_PRINT_QWORD_HEX:
      return SCC_HEX;
 
    case SCC_NEWGRF_PRINT_DWORD_CURRENCY:
    case SCC_NEWGRF_PRINT_QWORD_CURRENCY:
      return SCC_CURRENCY_LONG;
 
    case SCC_NEWGRF_PRINT_WORD_STRING_ID:
      return SCC_NEWGRF_PRINT_WORD_STRING_ID;
 
    case SCC_NEWGRF_PRINT_WORD_DATE_LONG:
    case SCC_NEWGRF_PRINT_DWORD_DATE_LONG:
      return SCC_DATE_LONG;
 
    case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:
    case SCC_NEWGRF_PRINT_DWORD_DATE_SHORT:
      return SCC_DATE_SHORT;
 
    case SCC_NEWGRF_PRINT_WORD_SPEED:
      return SCC_VELOCITY;
 
    case SCC_NEWGRF_PRINT_WORD_VOLUME_LONG:
      return SCC_VOLUME_LONG;
 
    case SCC_NEWGRF_PRINT_WORD_VOLUME_SHORT:
      return SCC_VOLUME_SHORT;
 
    case SCC_NEWGRF_PRINT_WORD_WEIGHT_LONG:
      return SCC_WEIGHT_LONG;
 
    case SCC_NEWGRF_PRINT_WORD_WEIGHT_SHORT:
      return SCC_WEIGHT_SHORT;
 
    case SCC_NEWGRF_PRINT_WORD_POWER:
      return SCC_POWER;
 
    case SCC_NEWGRF_PRINT_DWORD_FORCE:
      return SCC_FORCE;
 
    case SCC_NEWGRF_PRINT_WORD_CARGO_LONG:
      return SCC_CARGO_LONG;
 
    case SCC_NEWGRF_PRINT_WORD_CARGO_SHORT:
      return SCC_CARGO_SHORT;
 
    case SCC_NEWGRF_PRINT_WORD_CARGO_TINY:
      return SCC_CARGO_TINY;
 
    case SCC_NEWGRF_PRINT_WORD_CARGO_NAME:
      return SCC_CARGO_LIST;
 
    case SCC_NEWGRF_PRINT_WORD_STATION_NAME:
      return SCC_STATION_NAME;
 
    /* These NewGRF string codes modify the NewGRF stack or otherwise do not map to OpenTTD string codes. */
    case SCC_NEWGRF_DISCARD_WORD:
    case SCC_NEWGRF_ROTATE_TOP_4_WORDS:
    case SCC_NEWGRF_PUSH_WORD:
      return 0;
  }
}