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