src/loader/Interpreter.cpp

   1 #include "Interpreter.h"
   2
   3 #include "ParsedSource.h"
   4 #include "TypeDescription.h"
   5 #include "../battle/Hero.h"
   6 #include "../battle/Monster.h"
   7 #include "../battle/PartyLayout.h"
   8 #include "../battle/Resources.h"
   9 #include "../common/Ikari.h"
  10 #include "../common/Item.h"
  11 #include "../common/Script.h"
  12 #include "../common/Spell.h"
  13 #include "../common/Stats.h"
  14 #include "../common/TargetingMode.h"
  15 #include "../graphics/ComplexAnimation.h"
  16 #include "../graphics/Font.h"
  17 #include "../graphics/Frame.h"
  18 #include "../graphics/Gauge.h"
  19 #include "../graphics/Menu.h"
  20 #include "../graphics/SimpleAnimation.h"
  21 #include "../graphics/Sprite.h"
  22
  23 #include <algorithm>
  24 #include <cstring>
  25 #include <SDL_image.h>
  26
  27 using battle::Hero;
  28 using battle::Monster;
  29 using battle::PartyLayout;
  30 using common::Ikari;
  31 using common::Item;
  32 using common::Script;
  33 using common::Spell;
  34 using common::Stats;
  35 using common::TargetingMode;
  36 using graphics::Animation;
  37 using graphics::Color;
  38 using graphics::Font;
  39 using graphics::Frame;
  40 using graphics::Gauge;
  41 using graphics::ComplexAnimation;
  42 using graphics::SimpleAnimation;
  43 using graphics::Sprite;
  44 using math::Vector;
  45 using std::make_pair;
  46 using std::set;
  47 using std::string;
  48 using std::vector;
  49
  50 namespace loader {
  51
  52 Interpreter::~Interpreter() {
  53         for (std::map<string, SDL_Surface *>::const_iterator i(imageCache.begin()), end(imageCache.end()); i != end; ++i) {
  54                 SDL_FreeSurface(i->second);
  55         }
  56 }
  57
  58
  59 const Interpreter::ParsedDefinition &Interpreter::GetDefinition(const string &identifier) {
  60         std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(identifier));
  61         if (i != parsedDefinitions.end()) {
  62                 return i->second;
  63         } else if (source.IsDefined(identifier)) {
  64                 ReadDefinition(source.GetDefinition(identifier));
  65                 return parsedDefinitions.at(identifier);
  66         } else {
  67                 throw Error("access to undefined object " + identifier);
  68         }
  69 }
  70
  71 const Interpreter::ParsedDefinition &Interpreter::GetDefinition(const string &identifier) const {
  72         std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(identifier));
  73         if (i != parsedDefinitions.end()) {
  74                 return i->second;
  75         } else {
  76                 throw Error("access to undefined object " + identifier);
  77         }
  78 }
  79
  80
  81 void *Interpreter::GetObject(
  82                 int typeId,
  83                 const std::string &name) {
  84         std::map<string, ParsedDefinition>::const_iterator
  85                         i(parsedDefinitions.find(name));
  86         if (i != parsedDefinitions.end()) {
  87                 const TypeDescription &requested =
  88                                 TypeDescription::Get(typeId);
  89                 const TypeDescription &actual =
  90                                 TypeDescription::Get(i->second.type);
  91                 if (requested.TypeId() == actual.TypeId()) {
  92                         return values[actual.TypeId()][i->second.id];
  93                 } else if (actual.IsSubtypeOf(requested)) {
  94                         char *sub = reinterpret_cast<char *>(
  95                                         values[actual.TypeId()][i->second.id]);
  96                         std::ptrdiff_t offset =
  97                                         actual.SupertypeOffset(requested);
  98                         return sub - offset;
  99                 } else {
 100                         throw Error("cannot cast " + actual.TypeName()
 101                                         + " to " + requested.TypeName());
 102                 }
 103         } else {
 104                 throw Error("access to undefined object " + name);
 105         }
 106 }
 107
 108 const void *Interpreter::GetObject(
 109                 int typeId,
 110                 const std::string &name) const {
 111         std::map<string, ParsedDefinition>::const_iterator
 112                         i(parsedDefinitions.find(name));
 113         if (i != parsedDefinitions.end()) {
 114                 const TypeDescription &requested =
 115                                 TypeDescription::Get(typeId);
 116                 const TypeDescription &actual =
 117                                 TypeDescription::Get(i->second.type);
 118                 if (requested.TypeId() == actual.TypeId()) {
 119                         return values.at(actual.TypeId()).at(i->second.id);
 120                 } else if (actual.IsSubtypeOf(requested)) {
 121                         char *sub = reinterpret_cast<char *>(
 122                                         values.at(actual.TypeId()).at(i->second.id));
 123                         std::ptrdiff_t offset =
 124                                         actual.SupertypeOffset(requested);
 125                         return sub - offset;
 126                 } else {
 127                         throw Error("cannot cast " + actual.TypeName()
 128                                         + " to " + requested.TypeName());
 129                 }
 130         } else {
 131                 throw Error("access to undefined object " + name);
 132         }
 133 }
 134
 135
 136 void Interpreter::ReadSource() {
 137         for (set<string>::const_iterator i(source.Exports().begin()), end(source.Exports().end()); i != end; ++i) {
 138                 ReadDefinition(source.GetDefinition(*i));
 139         }
 140 }
 141
 142 void Interpreter::ReadDefinition(const Definition &dfn) {
 143         if (parsedDefinitions.find(dfn.Identifier()) != parsedDefinitions.end()) {
 144                 return;
 145         }
 146         if (dfn.HasLiteralValue()) {
 147                 ReadLiteral(dfn);
 148         } else {
 149                 ReadObject(dfn);
 150         }
 151 }
 152
 153 void Interpreter::ReadLiteral(const Definition &dfn) {
 154         const string &typeName(dfn.GetLiteral()->IsArray() ? "Array" : dfn.GetLiteral()->GetTypeName());
 155         int typeId(TypeDescription::GetTypeId(typeName));
 156         int id(values[typeId].size());
 157         const TypeDescription &td(TypeDescription::Get(typeId));
 158         int size(
 159                         (dfn.GetLiteral()->GetType() == Literal::PATH
 160                                         || dfn.GetLiteral()->GetType() == Literal::STRING)
 161                         ? dfn.GetLiteral()->GetString().size() : td.Size());
 162         char *object(alloc.Alloc(size));
 163         values[typeId].push_back(object);
 164         parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 165         if (dfn.GetLiteral()->GetType() == Literal::OBJECT) {
 166                 ReadObject(typeId, id, object, *dfn.GetLiteral()->GetProperties());
 167         } else {
 168                 ReadLiteral(typeId, id, object, *dfn.GetLiteral());
 169         }
 170 }
 171
 172 void Interpreter::ReadLiteral(int typeId, int id, char *object, const Literal &literal) {
 173         switch (literal.GetType()) {
 174                 case Literal::ARRAY_VALUES:
 175                 case Literal::ARRAY_PROPS:
 176                 case Literal::ARRAY_IDENTS:
 177                         throw Error("named arrays are not supported, sorry");
 178                         break;
 179                 case Literal::BOOLEAN:
 180                         new (object) bool(literal.GetBoolean());
 181                         break;
 182                 case Literal::COLOR:
 183                         new (object) Color(literal.GetRed(), literal.GetGreen(), literal.GetBlue(), literal.GetAlpha());
 184                         break;
 185                 case Literal::NUMBER:
 186                         new (object) int(literal.GetNumber());
 187                         break;
 188                 case Literal::PATH:
 189                         std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 190                         object[literal.GetString().size()] = '\0';
 191                         break;
 192                 case Literal::SCRIPT:
 193                         new (object) Script;
 194                         ReadScript(literal.GetScript(), reinterpret_cast<Script *>(object));
 195                         break;
 196                 case Literal::STRING:
 197                         std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 198                         object[literal.GetString().size()] = '\0';
 199                         break;
 200                 case Literal::VECTOR:
 201                         new (object) Vector<int>(literal.GetX(), literal.GetY());
 202                         break;
 203                 case Literal::OBJECT:
 204                         throw Error("illogical branch: read literal object as non-object literal");
 205         }
 206 }
 207
 208
 209 void *Interpreter::GetObject(int typeId, const Value &v) {
 210         if (v.IsLiteral()) {
 211                 if (v.GetLiteral().IsObject()) {
 212                         int typeId(TypeDescription::GetTypeId(v.GetLiteral().GetTypeName()));
 213                         const TypeDescription &td(TypeDescription::Get(typeId));
 214                         char *object(alloc.Alloc(td.Size()));
 215                         td.Construct(object);
 216                         int id(values[typeId].size());
 217                         values[typeId].push_back(object);
 218                         ReadObject(typeId, id, object, *v.GetLiteral().GetProperties());
 219                         return object;
 220                 } else {
 221                         int typeId(0), id(0);
 222                         switch (v.GetLiteral().GetType()) {
 223                                 case Literal::ARRAY_VALUES:
 224                                 case Literal::ARRAY_PROPS:
 225                                 case Literal::ARRAY_IDENTS:
 226                                         throw Error("cannot copy arrays, sorry");
 227                                         break;
 228                                 case Literal::BOOLEAN:
 229                                         {
 230                                                 typeId = TypeDescription::GetTypeId("Boolean");
 231                                                 id = values[typeId].size();
 232                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 233                                                 char *object(alloc.Alloc(td.Size()));
 234                                                 values[typeId].push_back(new (object) bool(v.GetLiteral().GetBoolean()));
 235                                         }
 236                                         break;
 237                                 case Literal::COLOR:
 238                                         {
 239                                                 typeId = TypeDescription::GetTypeId("Color");
 240                                                 id = values[typeId].size();
 241                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 242                                                 char *object(alloc.Alloc(td.Size()));
 243                                                 values[typeId].push_back(new (object) Color(v.GetLiteral().GetRed(), v.GetLiteral().GetGreen(), v.GetLiteral().GetBlue(), v.GetLiteral().GetAlpha()));
 244                                         }
 245                                         break;
 246                                 case Literal::NUMBER:
 247                                         {
 248                                                 typeId = TypeDescription::GetTypeId("Number");
 249                                                 id = values[typeId].size();
 250                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 251                                                 char *object(alloc.Alloc(td.Size()));
 252                                                 values[typeId].push_back(new (object) int(v.GetLiteral().GetNumber()));
 253                                         }
 254                                         break;
 255                                 case Literal::PATH:
 256                                         {
 257                                                 typeId = TypeDescription::GetTypeId("Path");
 258                                                 id = values[typeId].size();
 259                                                 char *str(alloc.Alloc(v.GetLiteral().GetString().size() + 1));
 260                                                 std::memcpy(str, v.GetLiteral().GetString().c_str(), v.GetLiteral().GetString().size());
 261                                                 str[v.GetLiteral().GetString().size()] = '\0';
 262                                                 values[typeId].push_back(str);
 263                                         }
 264                                         break;
 265                                 case Literal::SCRIPT:
 266                                         {
 267                                                 typeId = TypeDescription::GetTypeId("Script");
 268                                                 char *script(ReadScript(v.GetLiteral().GetScript()));
 269                                                 id = values[typeId].size();
 270                                                 values[typeId].push_back(script);
 271                                         }
 272                                         break;
 273                                 case Literal::STRING:
 274                                         {
 275                                                 typeId = TypeDescription::GetTypeId("String");
 276                                                 id = values[typeId].size();
 277                                                 char *str(alloc.Alloc(v.GetLiteral().GetString().size() + 1));
 278                                                 std::memcpy(str, v.GetLiteral().GetString().c_str(), v.GetLiteral().GetString().size());
 279                                                 str[v.GetLiteral().GetString().size()] = '\0';
 280                                                 values[typeId].push_back(str);
 281                                         }
 282                                         break;
 283                                 case Literal::VECTOR:
 284                                         {
 285                                                 typeId = TypeDescription::GetTypeId("Vector");
 286                                                 id = values[typeId].size();
 287                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 288                                                 char *object(alloc.Alloc(td.Size()));
 289                                                 values[typeId].push_back(new (object) Vector<int>(v.GetLiteral().GetX(), v.GetLiteral().GetY()));
 290                                         }
 291                                         break;
 292                                 case Literal::OBJECT:
 293                                         {
 294                                                 typeId = TypeDescription::GetTypeId(v.GetLiteral().GetTypeName());
 295                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 296                                                 id = values[typeId].size();
 297                                                 char *object(alloc.Alloc(td.Size()));
 298                                                 td.Construct(object);
 299                                                 ReadObject(typeId, id, object, *v.GetLiteral().GetProperties());
 300                                         }
 301                                         break;
 302                         }
 303                         return values[typeId][id];
 304                 }
 305         } else {
 306                 ReadDefinition(source.GetDefinition(v.GetIdentifier()));
 307                 return GetObject(typeId, v.GetIdentifier());
 308         }
 309 }
 310
 311
 312 void Interpreter::ReadObject(const Definition &dfn) {
 313         int typeId(TypeDescription::GetTypeId(dfn.TypeName()));
 314         const TypeDescription &td(TypeDescription::Get(typeId));
 315         int id(values[typeId].size());
 316         char *object(alloc.Alloc(td.Size()));
 317         td.Construct(object);
 318         values[typeId].push_back(object);
 319         parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 320         ReadObject(typeId, id, object, *dfn.GetProperties());
 321 }
 322
 323
 324 void Interpreter::ReadObject(int typeId, int id, char *object, const PropertyList &props) {
 325         const TypeDescription &td(TypeDescription::Get(typeId));
 326         for (PropertyList::ConstIterator i(props.Begin()), end(props.End()); i != end; ++i) {
 327                 const FieldDescription &fd(td.GetField(i->first));
 328                 const TypeDescription &fieldType(TypeDescription::Get(fd.TypeId()));
 329                 if (CanLink(*i->second)) {
 330                         char *dest(object + fd.Offset());
 331                         if (fd.IsAggregate()) {
 332                                 int arraySize(i->second->GetLiteral().ArraySize());
 333                                 size_t memberSize = fd.IsReferenced() ? sizeof(char *) : fieldType.Size();
 334                                 Array array;
 335                                 array.typeId = fd.TypeId();
 336                                 array.size = arraySize * memberSize;
 337                                 array.data = alloc.Alloc(array.size);
 338                                 array.ref = fd.IsReferenced();
 339                                 arrays.push_back(array);
 340                                 std::memset(array.data, 0, array.size);
 341                                 char *iter = reinterpret_cast<char *>(array.data);
 342                                 if (i->second->GetLiteral().GetType() == Literal::ARRAY_PROPS) {
 343                                         const vector<PropertyList *> &list(i->second->GetLiteral().GetPropertyLists());
 344                                         for (vector<PropertyList *>::const_iterator
 345                                                         j(list.begin()), end(list.end());
 346                                                         j != end; ++j, iter += memberSize) {
 347                                                 char *member;
 348                                                 if (fd.IsReferenced()) {
 349                                                         member = alloc.Alloc(fieldType.Size());
 350                                                         *reinterpret_cast<char **>(iter) = member;
 351                                                 } else {
 352                                                         member = iter;
 353                                                 }
 354                                                 fieldType.Construct(member);
 355                                                 ReadObject(fieldType.TypeId(), -1, member, **j);
 356                                         }
 357                                 } else if (i->second->GetLiteral().GetType() == Literal::ARRAY_VALUES) {
 358                                         const vector<Value *> &list(i->second->GetLiteral().GetValues());
 359                                         for (vector<Value *>::const_iterator j(list.begin()), end(list.end());
 360                                                         j != end; ++j, iter += memberSize) {
 361                                                 char *member;
 362                                                 if (fd.IsReferenced()) {
 363                                                         member = alloc.Alloc(fieldType.Size());
 364                                                         *reinterpret_cast<char **>(iter) = member;
 365                                                 } else {
 366                                                         member = iter;
 367                                                 }
 368                                                 fieldType.Construct(member);
 369                                                 ReadLiteral(fieldType.TypeId(), -1, member, (*j)->GetLiteral());
 370                                         }
 371                                 } else {
 372                                         if (!fd.IsReferenced()) {
 373                                                 // TODO: implement inline identifier arrays
 374                                                 throw std::runtime_error("inline identifier arrays not implemented (yet)");
 375                                         }
 376                                         const vector<string> &list(i->second->GetLiteral().GetIdentifiers());
 377                                         for (vector<string>::const_iterator j(list.begin()), end(list.end());
 378                                                         j != end; ++j, iter += memberSize) {
 379                                                 if (source.IsDefined(*j)) {
 380                                                         *reinterpret_cast<void **>(iter)
 381                                                                         = GetObject(fd.TypeId(), *j);
 382                                                 } else {
 383                                                         Postpone(reinterpret_cast<char *>(array.data),
 384                                                                         iter, *j, fd.TypeId(), false);
 385                                                 }
 386                                         }
 387                                 }
 388                                 size_t pLen = sizeof(char *);
 389                                 std::memcpy(dest, &array.data, pLen);
 390                                 dest += sizeof(char *);
 391                                 std::memcpy(dest, &arraySize, sizeof(int));
 392                         } else if (i->second->IsLiteral() && !fd.IsReferenced()) {
 393                                 // inline literals
 394                                 if (i->second->GetLiteral().IsObject()) {
 395                                         ReadObject(fd.TypeId(), -1, dest, *i->second->GetLiteral().GetProperties());
 396                                 } else {
 397                                         ReadLiteral(fd.TypeId(), -1, dest, i->second->GetLiteral());
 398                                 }
 399                         } else {
 400                                 char *src(reinterpret_cast<char *>(GetObject(fd.TypeId(), *i->second)));
 401                                 if (fd.TypeId() == TypeDescription::GetTypeId("Image")) {
 402                                         src = reinterpret_cast<char *>(GetImage(src));
 403                                 }
 404                                 if (fd.IsReferenced()) {
 405                                         std::memcpy(dest, &src, sizeof(char *));
 406                                 } else {
 407                                         std::memcpy(dest, src, fieldType.Size());
 408                                 }
 409                         }
 410                 } else {
 411                         Postpone(object, object + fd.Offset(), i->second->GetIdentifier(), fd.TypeId(), !fd.IsReferenced(), fd.IsAggregate());
 412                 }
 413         }
 414         td.Load(object);
 415 }
 416
 417
 418 void Interpreter::ReadScript(const std::vector<ScriptToken *> &s, Script *script) {
 419         std::map<string, int> labels;
 420         int size(0);
 421         for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
 422                 if ((*i)->GetType() == ScriptToken::LABEL) {
 423                         if (labels.count((*i)->Label())) {
 424                                 throw Error("duplicate label " + (*i)->Label());
 425                         } else {
 426                                 labels[(*i)->Label()] = size;
 427                         }
 428                 } else if ((*i)->GetType() != ScriptToken::COMMAND) {
 429                         throw Error("unexpected script token");
 430                 }
 431                 size += sizeof(Script::Code);
 432                 const string &cmd((*i)->CommandName());
 433                 if (cmd == "move") {
 434                         ++i;
 435                         if (i == end) {
 436                                 throw Error("unexpected script end after move");
 437                         }
 438                         const string &reg((*i)->RegisterName());
 439                         if (reg.size() != 2) {
 440                                 throw Error("invalid register name " + reg);
 441                         }
 442                         ++i;
 443                         if (i == end) {
 444                                 throw Error("unexpected script end after move");
 445                         }
 446                         if ((*i)->GetType() != ScriptToken::REGISTER) {
 447                                 switch (reg[0]) {
 448                                         case 'a':
 449                                                 size += sizeof(void *);
 450                                                 break;
 451                                         case 'i':
 452                                                 size += sizeof(int);
 453                                                 break;
 454                                         case 'v':
 455                                                 size += sizeof(Vector<int>);
 456                                                 break;
 457                                         default:
 458                                                 throw Error("unknown register " + reg);
 459                                 }
 460                         }
 461                 } else if (cmd == "add") {
 462                         ++i;
 463                         if (i == end) {
 464                                 throw Error("unexpected script end after add");
 465                         }
 466                         const string &reg((*i)->RegisterName());
 467                         if (reg.size() != 2) {
 468                                 throw Error("invalid register name " + reg);
 469                         }
 470                         ++i;
 471                         if (i == end) {
 472                                 throw Error("unexpected script end after add");
 473                         }
 474                         if ((*i)->GetType() != ScriptToken::REGISTER) {
 475                                 switch (reg[0]) {
 476                                         case 'i':
 477                                                 size += sizeof(int);
 478                                                 break;
 479                                         case 'v':
 480                                                 size += sizeof(Vector<int>);
 481                                                 break;
 482                                         default:
 483                                                 throw Error("expected register after add " + reg);
 484                                 }
 485                         }
 486                 } else if (cmd == "mod") {
 487                         ++i;
 488                         if (i == end) {
 489                                 throw Error("unexpected script end after mod");
 490                         }
 491                         ++i;
 492                         if (i == end) {
 493                                 throw Error("unexpected script end after mod");
 494                         }
 495                         if ((*i)->GetType() != ScriptToken::REGISTER) {
 496                                 size += sizeof(int);
 497                         }
 498                 } else if (cmd == "rand") {
 499                         ++i;
 500                         if (i == end) {
 501                                 throw Error("unexpected script end after rand");
 502                         }
 503                 } else if (cmd == "cmp") {
 504                         ++i;
 505                         if (i == end) {
 506                                 throw Error("unexpected script end after cmp");
 507                         }
 508                         if ((*i)->GetType() != ScriptToken::REGISTER) {
 509                                 size += sizeof(int);
 510                         }
 511                         ++i;
 512                         if (i == end) {
 513                                 throw Error("unexpected script end after cmp");
 514                         }
 515                         if ((*i)->GetType() != ScriptToken::REGISTER) {
 516                                 size += sizeof(int);
 517                         }
 518                 } else if (cmd == "jmp") {
 519                         size += sizeof(int);
 520                         ++i;
 521                         if (i == end) {
 522                                 throw Error("unexpected script end after cmp");
 523                         }
 524                 } else if (cmd == "jeq") {
 525                         size += sizeof(int);
 526                         ++i;
 527                         if (i == end) {
 528                                 throw Error("unexpected script end after cmp");
 529                         }
 530                 } else if (cmd == "jne") {
 531                         size += sizeof(int);
 532                         ++i;
 533                         if (i == end) {
 534                                 throw Error("unexpected script end after cmp");
 535                         }
 536                 } else if (cmd == "jl") {
 537                         size += sizeof(int);
 538                         ++i;
 539                         if (i == end) {
 540                                 throw Error("unexpected script end after cmp");
 541                         }
 542                 } else if (cmd == "jle") {
 543                         size += sizeof(int);
 544                         ++i;
 545                         if (i == end) {
 546                                 throw Error("unexpected script end after cmp");
 547                         }
 548                 } else if (cmd == "jg") {
 549                         size += sizeof(int);
 550                         ++i;
 551                         if (i == end) {
 552                                 throw Error("unexpected script end after cmp");
 553                         }
 554                 } else if (cmd == "jge") {
 555                         size += sizeof(int);
 556                         ++i;
 557                         if (i == end) {
 558                                 throw Error("unexpected script end after cmp");
 559                         }
 560                 } else if (cmd == "sysc") {
 561
 562                 } else {
 563                         throw Error("unknown command " + cmd);
 564                 }
 565         }
 566
 567         char *text(alloc.Alloc(size));
 568         int cursor(0);
 569         for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
 570                 if ((*i)->GetType() == ScriptToken::LABEL) {
 571                         continue;
 572                 }
 573                 if ((*i)->GetType() != ScriptToken::COMMAND) {
 574                         throw Error("unexpected script token");
 575                 }
 576                 const string &cmd((*i)->CommandName());
 577                 if (cmd == "move") {
 578                         Script::Code &code(CreateScriptCode(Script::COMMAND_MOVE, text + cursor));
 579                         cursor += sizeof(Script::Code);
 580                         code.numParams = 2;
 581                         ++i;
 582                         const string &reg((*i)->RegisterName());
 583                         switch (reg[0]) {
 584                                 case 'a':
 585                                         code.type = Script::TYPE_ADDRESS;
 586                                         break;
 587                                 case 'i':
 588                                         code.type = Script::TYPE_INTEGER;
 589                                         break;
 590                                 case 'v':
 591                                         code.type = Script::TYPE_VECTOR;
 592                                         break;
 593                                 default:
 594                                         throw Error("invalid register " + reg);
 595                         }
 596                         int regnum(reg[1] - '0');
 597                         if (regnum < 0 || regnum > 6) {
 598                                 throw Error("invalid register " + reg);
 599                         }
 600                         code.reg1 = regnum;
 601                         ++i;
 602
 603                         if ((*i)->GetType() == ScriptToken::REGISTER) {
 604                                 string reg2((*i)->RegisterName());
 605                                 if (reg[0] != reg2[0]) {
 606                                         throw Error("mixed-type commands not allowed");
 607                                 }
 608                                 int reg2num(reg[1] - '0');
 609                                 if (reg2num < 0 || reg2num > 6) {
 610                                         throw Error("invalid register " + reg2);
 611                                 }
 612                                 code.reg2 = reg2num;
 613                         } else {
 614                                 code.reg2 = 7;
 615                                 switch (code.type) {
 616                                         case Script::TYPE_ADDRESS:
 617                                                 ReadScriptAddress(**i, text + cursor);
 618                                                 cursor += sizeof(void *);
 619                                                 break;
 620                                         case Script::TYPE_INTEGER:
 621                                                 ReadScriptInteger(**i, text + cursor);
 622                                                 cursor += sizeof(int);
 623                                                 break;
 624                                         case Script::TYPE_VECTOR:
 625                                                 ReadScriptVector(**i, text + cursor);
 626                                                 cursor += sizeof(Vector<int>);
 627                                                 break;
 628                                 }
 629                         }
 630                 } else if (cmd == "add") {
 631                         Script::Code &code(CreateScriptCode(Script::COMMAND_ADD, text + cursor));
 632                         cursor += sizeof(Script::Code);
 633                         code.numParams = 2;
 634                         ++i;
 635                         const string &reg((*i)->RegisterName());
 636                         switch (reg[0]) {
 637                                 case 'i':
 638                                         code.type = Script::TYPE_INTEGER;
 639                                         break;
 640                                 case 'v':
 641                                         code.type = Script::TYPE_VECTOR;
 642                                         break;
 643                                 default:
 644                                         throw Error("invalid register " + reg);
 645                         }
 646                         int regnum(reg[1] - '0');
 647                         if (regnum < 0 || regnum > 6) {
 648                                 throw Error("invalid register " + reg);
 649                         }
 650                         code.reg1 = regnum;
 651                         ++i;
 652
 653                         if ((*i)->GetType() == ScriptToken::REGISTER) {
 654                                 string reg2((*i)->RegisterName());
 655                                 if (reg[0] != reg2[0]) {
 656                                         throw Error("mixed-type commands not allowed");
 657                                 }
 658                                 int reg2num(reg[1] - '0');
 659                                 if (reg2num < 0 || reg2num > 6) {
 660                                         throw Error("invalid register name " + reg2);
 661                                 }
 662                                 code.reg2 = reg2num;
 663                         } else {
 664                                 code.reg2 = 7;
 665                                 switch (code.type) {
 666                                         case Script::TYPE_INTEGER:
 667                                                 ReadScriptInteger(**i, text + cursor);
 668                                                 cursor += sizeof(int);
 669                                                 break;
 670                                         case Script::TYPE_VECTOR:
 671                                                 ReadScriptVector(**i, text + cursor);
 672                                                 cursor += sizeof(Vector<int>);
 673                                                 break;
 674                                 }
 675                         }
 676                 } else if (cmd == "mod") {
 677                         Script::Code &code(CreateScriptCode(Script::COMMAND_MOD, text + cursor));
 678                         cursor += sizeof(Script::Code);
 679                         code.numParams = 2;
 680                         ++i;
 681                         const string &reg((*i)->RegisterName());
 682                         if (reg[0] != 'i') {
 683                                 throw Error("invalid register " + reg);
 684                         }
 685                         code.type = Script::TYPE_INTEGER;
 686                         int regnum(reg[1] - '0');
 687                         if (regnum < 0 || regnum > 6) {
 688                                 throw Error("invalid register " + reg);
 689                         }
 690                         code.reg1 = regnum;
 691                         ++i;
 692
 693                         if ((*i)->GetType() == ScriptToken::REGISTER) {
 694                                 string reg2((*i)->RegisterName());
 695                                 if (reg[0] != reg2[0]) {
 696                                         throw Error("mixed-type commands not allowed");
 697                                 }
 698                                 int reg2num(reg[1] - '0');
 699                                 if (reg2num < 0 || reg2num > 6) {
 700                                         throw Error("invalid register name " + reg2);
 701                                 }
 702                                 code.reg2 = reg2num;
 703                         } else {
 704                                 code.reg2 = 7;
 705                                 ReadScriptInteger(**i, text + cursor);
 706                                 cursor += sizeof(int);
 707                         }
 708                 } else if (cmd == "rand") {
 709                         Script::Code &code(CreateScriptCode(Script::COMMAND_RAND, text + cursor));
 710                         cursor += sizeof(Script::Code);
 711                         code.numParams = 1;
 712                         ++i;
 713                         const string &reg((*i)->RegisterName());
 714                         if (reg[0] != 'i') {
 715                                 throw Error("invalid register " + reg);
 716                         }
 717                         code.type = Script::TYPE_INTEGER;
 718                         int regnum(reg[1] - '0');
 719                         if (regnum < 0 || regnum > 6) {
 720                                 throw Error("invalid register " + reg);
 721                         }
 722                         code.reg1 = regnum;
 723                 } else if (cmd == "cmp") {
 724                         Script::Code &code(CreateScriptCode(Script::COMMAND_CMP, text + cursor));
 725                         cursor += sizeof(Script::Code);
 726                         code.numParams = 2;
 727                         ++i;
 728                         const string &reg((*i)->RegisterName());
 729                         if (reg[0] != 'i') {
 730                                 throw Error("invalid register " + reg);
 731                         }
 732                         code.type = Script::TYPE_INTEGER;
 733                         int regnum(reg[1] - '0');
 734                         if (regnum < 0 || regnum > 6) {
 735                                 throw Error("invalid register " + reg);
 736                         }
 737                         code.reg1 = regnum;
 738                         ++i;
 739
 740                         if ((*i)->GetType() == ScriptToken::REGISTER) {
 741                                 string reg2((*i)->RegisterName());
 742                                 if (reg[0] != reg2[0]) {
 743                                         throw Error("mixed-type commands not allowed");
 744                                 }
 745                                 int reg2num(reg[1] - '0');
 746                                 if (reg2num < 0 || reg2num > 6) {
 747                                         throw Error("invalid register name " + reg2);
 748                                 }
 749                                 code.reg2 = reg2num;
 750                         } else {
 751                                 code.reg2 = 7;
 752                                 ReadScriptInteger(**i, text + cursor);
 753                                 cursor += sizeof(int);
 754                         }
 755                 } else if (cmd == "jmp") {
 756                         Script::Code &code(CreateScriptCode(Script::COMMAND_JMP, text + cursor));
 757                         cursor += sizeof(Script::Code);
 758                         code.numParams = 1;
 759                         ++i;
 760                         if (!labels.count((*i)->Identifier())) {
 761                                 throw Error("use of undefined label " + (*i)->Identifier());
 762                         }
 763                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 764                         cursor += sizeof(int);
 765                 } else if (cmd == "jeq") {
 766                         Script::Code &code(CreateScriptCode(Script::COMMAND_JEQ, text + cursor));
 767                         cursor += sizeof(Script::Code);
 768                         code.numParams = 1;
 769                         ++i;
 770                         if (!labels.count((*i)->Identifier())) {
 771                                 throw Error("use of undefined label " + (*i)->Identifier());
 772                         }
 773                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 774                         cursor += sizeof(int);
 775                 } else if (cmd == "jne") {
 776                         Script::Code &code(CreateScriptCode(Script::COMMAND_JNE, text + cursor));
 777                         cursor += sizeof(Script::Code);
 778                         code.numParams = 1;
 779                         ++i;
 780                         if (!labels.count((*i)->Identifier())) {
 781                                 throw Error("use of undefined label " + (*i)->Identifier());
 782                         }
 783                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 784                         cursor += sizeof(int);
 785                 } else if (cmd == "jl") {
 786                         Script::Code &code(CreateScriptCode(Script::COMMAND_JL, text + cursor));
 787                         cursor += sizeof(Script::Code);
 788                         code.numParams = 1;
 789                         ++i;
 790                         if (!labels.count((*i)->Identifier())) {
 791                                 throw Error("use of undefined label " + (*i)->Identifier());
 792                         }
 793                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 794                         cursor += sizeof(int);
 795                 } else if (cmd == "jle") {
 796                         Script::Code &code(CreateScriptCode(Script::COMMAND_JLE, text + cursor));
 797                         cursor += sizeof(Script::Code);
 798                         code.numParams = 1;
 799                         ++i;
 800                         if (!labels.count((*i)->Identifier())) {
 801                                 throw Error("use of undefined label " + (*i)->Identifier());
 802                         }
 803                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 804                         cursor += sizeof(int);
 805                 } else if (cmd == "jg") {
 806                         Script::Code &code(CreateScriptCode(Script::COMMAND_JG, text + cursor));
 807                         cursor += sizeof(Script::Code);
 808                         code.numParams = 1;
 809                         ++i;
 810                         if (!labels.count((*i)->Identifier())) {
 811                                 throw Error("use of undefined label " + (*i)->Identifier());
 812                         }
 813                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 814                         cursor += sizeof(int);
 815                 } else if (cmd == "jge") {
 816                         Script::Code &code(CreateScriptCode(Script::COMMAND_JGE, text + cursor));
 817                         cursor += sizeof(Script::Code);
 818                         code.numParams = 1;
 819                         ++i;
 820                         if (!labels.count((*i)->Identifier())) {
 821                                 throw Error("use of undefined label " + (*i)->Identifier());
 822                         }
 823                         *reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
 824                         cursor += sizeof(int);
 825                 } else if (cmd == "sysc") {
 826                         Script::Code &code(CreateScriptCode(Script::COMMAND_SYSC, text + cursor));
 827                         cursor += sizeof(Script::Code);
 828                         code.numParams = 0;
 829                 } else {
 830                         throw Error("unknown command " + cmd);
 831                 }
 832         }
 833
 834         script->text = text;
 835         script->textlen = size;
 836 }
 837
 838 char *Interpreter::ReadScript(const vector<ScriptToken *> &s) {
 839         char *mem(alloc.Alloc(sizeof(Script)));
 840         new (mem) Script;
 841         Script *script(reinterpret_cast<Script *>(mem));
 842         ReadScript(s, script);
 843         return mem;
 844 }
 845
 846 Script::Code &Interpreter::CreateScriptCode(Script::Command c, char *dest) {
 847         Script::Code &code(*reinterpret_cast<Script::Code *>(dest));
 848         code.command = c;
 849         code.numParams = 0;
 850         code.type = Script::TYPE_NONE;
 851         code.reg1 = 7;
 852         code.reg2 = 7;
 853         return code;
 854 }
 855
 856 void Interpreter::ReadScriptAddress(const ScriptToken &t, char *dest) {
 857         if (t.GetType() != ScriptToken::IDENTIFIER) {
 858                 throw Error("expected identifier for address");
 859         }
 860         if (source.IsDefined(t.Identifier())) {
 861                 const ParsedDefinition &def(GetDefinition(t.Identifier()));
 862                 void *addr(GetObject(def.type, t.Identifier()));
 863                 *reinterpret_cast<void **>(dest) = addr;
 864         } else {
 865                 throw Error("postponing values in scripts not implemented");
 866         }
 867 }
 868
 869 void Interpreter::ReadScriptInteger(const ScriptToken &t, char *dest) {
 870         if (t.GetType() == ScriptToken::IDENTIFIER) {
 871                 if (source.IsDefined(t.Identifier())) {
 872                         void *num(GetObject(TypeDescription::GetTypeId("Number"), t.Identifier()));
 873                         *reinterpret_cast<int *>(dest) = *reinterpret_cast<int *>(num);
 874                 } else {
 875                         throw Error("postponing values in scripts not implemented");
 876                 }
 877         } else if (t.GetType() == ScriptToken::LITERAL) {
 878                 *reinterpret_cast<int *>(dest) = t.GetLiteral()->GetNumber();
 879         } else {
 880                 throw Error("expected identifier or integer literal");
 881         }
 882 }
 883
 884 void Interpreter::ReadScriptVector(const ScriptToken &t, char *dest) {
 885         if (t.GetType() == ScriptToken::IDENTIFIER) {
 886                 if (source.IsDefined(t.Identifier())) {
 887                         void *vec(GetObject(TypeDescription::GetTypeId("Vector"), t.Identifier()));
 888                         *reinterpret_cast<Vector<int> *>(dest) = *reinterpret_cast<Vector<int> *>(vec);
 889                 } else {
 890                         throw Error("postponing values in scripts not implemented");
 891                 }
 892         } else if (t.GetType() == ScriptToken::LITERAL) {
 893                 *reinterpret_cast<Vector<int> *>(dest) = Vector<int>(t.GetLiteral()->GetX(), t.GetLiteral()->GetY());
 894         } else {
 895                 throw Error("expected identifier or vector literal");
 896         }
 897 }
 898
 899
 900 SDL_Surface *Interpreter::GetImage(const string &path) {
 901         std::map<string, SDL_Surface *>::const_iterator result(imageCache.find(path));
 902         if (result != imageCache.end()) {
 903                 return result->second;
 904         } else {
 905                 SDL_Surface *image(IMG_Load(path.c_str()));
 906                 imageCache.insert(make_pair(path, image));
 907                 return image;
 908         }
 909 }
 910
 911 const string &Interpreter::FindImage(SDL_Surface *img) const {
 912         for (std::map<string, SDL_Surface *>::const_iterator
 913                         i(imageCache.begin()), end(imageCache.end());
 914                         i != end; ++i) {
 915                 if (i->second == img) {
 916                         return i->first;
 917                 }
 918         }
 919         throw Error("unable to locate image");
 920 }
 921
 922
 923 bool Interpreter::CanLink(const Value &v) const {
 924         return v.IsLiteral() || source.IsDefined(v.GetIdentifier());
 925 }
 926
 927 void Interpreter::Postpone(
 928                 char *object,
 929                 char *dest,
 930                 const std::string &identifier,
 931                 int type,
 932                 bool inlined,
 933                 bool aggregate) {
 934         postponedDefinitions.push_back(
 935                         PostponedDefinition(object, dest, identifier, type, inlined, aggregate));
 936 }
 937
 938
 939 void Interpreter::CreateTypeDescriptions() {
 940         {
 941                 TypeDescription &td(TypeDescription::Create(BOOLEAN_ID, "Boolean"));
 942                 td.SetDescription("Logical value which can be either true or false.");
 943                 td.SetSize(sizeof(bool));
 944         }
 945         {
 946                 TypeDescription &td(TypeDescription::Create(COLOR_ID, "Color"));
 947                 td.SetDescription(
 948                                 "A color in RGB format with an optional alpha channel.\n"
 949                                 "Components range from 0 to 255.\n"
 950                                 "Alpha defaults to 255 if omitted.");
 951                 td.SetSize(sizeof(Color));
 952         }
 953         {
 954                 TypeDescription &td(TypeDescription::Create(IMAGE_ID, "Image"));
 955                 td.SetDescription("Path to a PNG file with image data.");
 956                 td.SetSize(sizeof(SDL_Surface));
 957         }
 958         {
 959                 TypeDescription &td(TypeDescription::Create(NUMBER_ID, "Number"));
 960                 td.SetDescription("A signed integer.");
 961                 td.SetSize(sizeof(int));
 962         }
 963         {
 964                 TypeDescription &td(TypeDescription::Create(PATH_ID, "Path"));
 965                 td.SetDescription("A path in the filesystem which is interpreted relative to the source file's location.");
 966                 td.SetSize(1);
 967                 td.AddSupertype(STRING_ID, 0);
 968         }
 969         {
 970                 Script s;
 971                 TypeDescription &td(TypeDescription::Create(SCRIPT_ID, "Script"));
 972                 td.SetDescription("Collection of commands that define a behaviour.");
 973                 td.SetSize(sizeof(Script));
 974                 td.AddField("text", FieldDescription(((char *)&s.text) - ((char *)&s), STRING_ID).SetAggregate());
 975         }
 976         {
 977                 TypeDescription &td(TypeDescription::Create(STRING_ID, "String"));
 978                 td.SetDescription("Some characters.");
 979                 td.SetSize(1);
 980         }
 981         {
 982                 TypeDescription &td(TypeDescription::Create(VECTOR_ID, "Vector"));
 983                 td.SetDescription("A pair of numbers usually describing a 2D translation or offset.");
 984                 td.SetSize(sizeof(Vector<int>));
 985         }
 986 }
 987
 988 }