src/loader/Interpreter.cpp

   1 /*
   2  * Interpreter.cpp
   3  *
   4  *  Created on: Aug 26, 2012
   5  *      Author: holy
   6  */
   7
   8 #include "Interpreter.h"
   9
  10 #include "ParsedSource.h"
  11 #include "../battle/Hero.h"
  12 #include "../battle/Monster.h"
  13 #include "../battle/PartyLayout.h"
  14 #include "../battle/Resources.h"
  15 #include "../common/Ikari.h"
  16 #include "../common/Item.h"
  17 #include "../common/Script.h"
  18 #include "../common/Spell.h"
  19 #include "../common/Stats.h"
  20 #include "../common/TargetingMode.h"
  21 #include "../graphics/ComplexAnimation.h"
  22 #include "../graphics/Font.h"
  23 #include "../graphics/Frame.h"
  24 #include "../graphics/Gauge.h"
  25 #include "../graphics/Menu.h"
  26 #include "../graphics/SimpleAnimation.h"
  27 #include "../graphics/Sprite.h"
  28
  29 #include <algorithm>
  30 #include <cstring>
  31 #include <SDL_image.h>
  32
  33 using battle::Hero;
  34 using battle::Monster;
  35 using battle::PartyLayout;
  36 using common::Ikari;
  37 using common::Item;
  38 using common::Script;
  39 using common::Spell;
  40 using common::Stats;
  41 using common::TargetingMode;
  42 using graphics::Animation;
  43 using graphics::Color;
  44 using graphics::Font;
  45 using graphics::Frame;
  46 using graphics::Gauge;
  47 using graphics::ComplexAnimation;
  48 using graphics::SimpleAnimation;
  49 using graphics::Sprite;
  50 using geometry::Vector;
  51 using std::make_pair;
  52 using std::set;
  53 using std::string;
  54 using std::vector;
  55
  56 namespace loader {
  57
  58 Interpreter::~Interpreter() {
  59         for (std::map<string, SDL_Surface *>::const_iterator i(imageCache.begin()), end(imageCache.end()); i != end; ++i) {
  60                 SDL_FreeSurface(i->second);
  61         }
  62 }
  63
  64
  65 const Interpreter::ParsedDefinition &Interpreter::GetDefinition(const string &identifier) {
  66         std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(identifier));
  67         if (i != parsedDefinitions.end()) {
  68                 return i->second;
  69         } else if (source.IsDefined(identifier)) {
  70                 ReadDefinition(source.GetDefinition(identifier));
  71                 return parsedDefinitions.at(identifier);
  72         } else {
  73                 throw Error("access to undefined object " + identifier);
  74         }
  75 }
  76
  77
  78 void *Interpreter::GetObject(int typeId, const std::string &name) {
  79         std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(name));
  80         if (i != parsedDefinitions.end()) {
  81                 const TypeDescription &requested(TypeDescription::Get(typeId));
  82                 const TypeDescription &actual(TypeDescription::Get(i->second.type));
  83                 if (requested.TypeId() == actual.TypeId()) {
  84                         return values[actual.TypeId()][i->second.id];
  85                 } else if (actual.IsSubtypeOf(requested)) {
  86                         char *sub(reinterpret_cast<char *>(values[actual.TypeId()][i->second.id]));
  87                         std::ptrdiff_t offset(actual.SupertypeOffset(requested));
  88                         return sub - offset;
  89                 } else {
  90                         throw Error("cannot cast " + actual.TypeName() + " to " + requested.TypeName());
  91                 }
  92         } else {
  93                 throw Error("access to undefined object " + name);
  94         }
  95 }
  96
  97
  98 void Interpreter::ReadSource() {
  99         for (set<string>::const_iterator i(source.Exports().begin()), end(source.Exports().end()); i != end; ++i) {
 100                 ReadDefinition(source.GetDefinition(*i));
 101         }
 102 }
 103
 104 void Interpreter::ReadDefinition(const Definition &dfn) {
 105         if (parsedDefinitions.find(dfn.Identifier()) != parsedDefinitions.end()) {
 106                 return;
 107         }
 108         if (dfn.HasLiteralValue()) {
 109                 ReadLiteral(dfn);
 110         } else {
 111                 ReadObject(dfn);
 112         }
 113 }
 114
 115 void Interpreter::ReadLiteral(const Definition &dfn) {
 116         const string &typeName(dfn.GetLiteral()->IsArray() ? "Array" : dfn.GetLiteral()->GetTypeName());
 117         int typeId(TypeDescription::GetTypeId(typeName));
 118         int id(values[typeId].size());
 119         const TypeDescription &td(TypeDescription::Get(typeId));
 120         int size(
 121                         (dfn.GetLiteral()->GetType() == Literal::PATH
 122                                         || dfn.GetLiteral()->GetType() == Literal::STRING)
 123                         ? dfn.GetLiteral()->GetString().size() : td.Size());
 124         char *object(alloc.Alloc(size));
 125         values[typeId].push_back(object);
 126         parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 127         if (dfn.GetLiteral()->GetType() == Literal::OBJECT) {
 128                 ReadObject(typeId, id, object, *dfn.GetLiteral()->GetProperties());
 129         } else {
 130                 ReadLiteral(typeId, id, object, *dfn.GetLiteral());
 131         }
 132 }
 133
 134 void Interpreter::ReadLiteral(int typeId, int id, char *object, const Literal &literal) {
 135         switch (literal.GetType()) {
 136                 case Literal::ARRAY_VALUES:
 137                         throw Error("named value arrays are not supported, sorry");
 138                         break;
 139                 case Literal::ARRAY_PROPS:
 140                         throw Error("named property list arrays are not supported, sorry");
 141                         break;
 142                 case Literal::BOOLEAN:
 143                         new (object) bool(literal.GetBoolean());
 144                         break;
 145                 case Literal::COLOR:
 146                         new (object) Color(literal.GetRed(), literal.GetGreen(), literal.GetBlue(), literal.GetAlpha());
 147                         break;
 148                 case Literal::NUMBER:
 149                         new (object) int(literal.GetNumber());
 150                         break;
 151                 case Literal::PATH:
 152                         std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 153                         object[literal.GetString().size()] = '\0';
 154                         break;
 155                 case Literal::SCRIPT:
 156                         new (object) Script;
 157                         ReadScript(literal.GetScript(), reinterpret_cast<Script *>(object));
 158                         break;
 159                 case Literal::STRING:
 160                         std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 161                         object[literal.GetString().size()] = '\0';
 162                         break;
 163                 case Literal::VECTOR:
 164                         new (object) Vector<int>(literal.GetX(), literal.GetY());
 165                         break;
 166                 case Literal::OBJECT:
 167                         throw Error("illogical branch: read literal object as non-object literal");
 168         }
 169 }
 170
 171
 172 void *Interpreter::GetObject(int typeId, const Value &v) {
 173         if (v.IsLiteral()) {
 174                 if (v.GetLiteral().IsObject()) {
 175                         int typeId(TypeDescription::GetTypeId(v.GetLiteral().GetTypeName()));
 176                         const TypeDescription &td(TypeDescription::Get(typeId));
 177                         char *object(alloc.Alloc(td.Size()));
 178                         td.Construct(object);
 179                         int id(values[typeId].size());
 180                         values[typeId].push_back(object);
 181                         ReadObject(typeId, id, object, *v.GetLiteral().GetProperties());
 182                         return object;
 183                 } else {
 184                         int typeId(0), id(0);
 185                         switch (v.GetLiteral().GetType()) {
 186                                 case Literal::ARRAY_VALUES:
 187                                         throw Error("cannot copy value arrays, sorry");
 188                                         break;
 189                                 case Literal::ARRAY_PROPS:
 190                                         throw Error("cannot copy property list arrays, sorry");
 191                                         break;
 192                                 case Literal::BOOLEAN:
 193                                         {
 194                                                 typeId = TypeDescription::GetTypeId("Boolean");
 195                                                 id = values[typeId].size();
 196                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 197                                                 char *object(alloc.Alloc(td.Size()));
 198                                                 values[typeId].push_back(new (object) bool(v.GetLiteral().GetBoolean()));
 199                                         }
 200                                         break;
 201                                 case Literal::COLOR:
 202                                         {
 203                                                 typeId = TypeDescription::GetTypeId("Color");
 204                                                 id = values[typeId].size();
 205                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 206                                                 char *object(alloc.Alloc(td.Size()));
 207                                                 values[typeId].push_back(new (object) Color(v.GetLiteral().GetRed(), v.GetLiteral().GetGreen(), v.GetLiteral().GetBlue(), v.GetLiteral().GetAlpha()));
 208                                         }
 209                                         break;
 210                                 case Literal::NUMBER:
 211                                         {
 212                                                 typeId = TypeDescription::GetTypeId("Number");
 213                                                 id = values[typeId].size();
 214                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 215                                                 char *object(alloc.Alloc(td.Size()));
 216                                                 values[typeId].push_back(new (object) int(v.GetLiteral().GetNumber()));
 217                                         }
 218                                         break;
 219                                 case Literal::PATH:
 220                                         {
 221                                                 typeId = TypeDescription::GetTypeId("Path");
 222                                                 id = values[typeId].size();
 223                                                 char *str(alloc.Alloc(v.GetLiteral().GetString().size() + 1));
 224                                                 std::memcpy(str, v.GetLiteral().GetString().c_str(), v.GetLiteral().GetString().size());
 225                                                 str[v.GetLiteral().GetString().size()] = '\0';
 226                                                 values[typeId].push_back(str);
 227                                         }
 228                                         break;
 229                                 case Literal::SCRIPT:
 230                                         {
 231                                                 typeId = TypeDescription::GetTypeId("Script");
 232                                                 char *script(ReadScript(v.GetLiteral().GetScript()));
 233                                                 id = values[typeId].size();
 234                                                 values[typeId].push_back(script);
 235                                         }
 236                                         break;
 237                                 case Literal::STRING:
 238                                         {
 239                                                 typeId = TypeDescription::GetTypeId("String");
 240                                                 id = values[typeId].size();
 241                                                 char *str(alloc.Alloc(v.GetLiteral().GetString().size() + 1));
 242                                                 std::memcpy(str, v.GetLiteral().GetString().c_str(), v.GetLiteral().GetString().size());
 243                                                 str[v.GetLiteral().GetString().size()] = '\0';
 244                                                 values[typeId].push_back(str);
 245                                         }
 246                                         break;
 247                                 case Literal::VECTOR:
 248                                         {
 249                                                 typeId = TypeDescription::GetTypeId("Vector");
 250                                                 id = values[typeId].size();
 251                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 252                                                 char *object(alloc.Alloc(td.Size()));
 253                                                 values[typeId].push_back(new (object) Vector<int>(v.GetLiteral().GetX(), v.GetLiteral().GetY()));
 254                                         }
 255                                         break;
 256                                 case Literal::OBJECT:
 257                                         {
 258                                                 typeId = TypeDescription::GetTypeId(v.GetLiteral().GetTypeName());
 259                                                 const TypeDescription &td(TypeDescription::Get(typeId));
 260                                                 id = values[typeId].size();
 261                                                 char *object(alloc.Alloc(td.Size()));
 262                                                 td.Construct(object);
 263                                                 ReadObject(typeId, id, object, *v.GetLiteral().GetProperties());
 264                                         }
 265                                         break;
 266                         }
 267                         return values[typeId][id];
 268                 }
 269         } else {
 270                 ReadDefinition(source.GetDefinition(v.GetIdentifier()));
 271                 return GetObject(typeId, v.GetIdentifier());
 272         }
 273 }
 274
 275
 276 void Interpreter::ReadObject(const Definition &dfn) {
 277         int typeId(TypeDescription::GetTypeId(dfn.TypeName()));
 278         const TypeDescription &td(TypeDescription::Get(typeId));
 279         int id(values[typeId].size());
 280         char *object(alloc.Alloc(td.Size()));
 281         td.Construct(object);
 282         values[typeId].push_back(object);
 283         parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 284         ReadObject(typeId, id, object, *dfn.GetProperties());
 285 }
 286
 287
 288 void Interpreter::ReadObject(int typeId, int id, char *object, const PropertyList &props) {
 289         const TypeDescription &td(TypeDescription::Get(typeId));
 290         for (PropertyList::ConstIterator i(props.Begin()), end(props.End()); i != end; ++i) {
 291                 const FieldDescription &fd(td.GetField(i->first));
 292                 const TypeDescription &fieldType(TypeDescription::Get(fd.TypeId()));
 293                 if (CanLink(*i->second)) {
 294                         char *dest(object + fd.Offset());
 295                         if (fd.IsAggregate()) {
 296                                 int arraySize(i->second->GetLiteral().ArraySize());
 297                                 char *aggregate(alloc.Alloc(fieldType.Size() * arraySize));
 298                                 char *iter(aggregate);
 299                                 if (i->second->GetLiteral().GetType() == Literal::ARRAY_PROPS) {
 300                                         const vector<PropertyList *> &list(i->second->GetLiteral().GetPropertyLists());
 301                                         for (vector<PropertyList *>::const_iterator j(list.begin()), end(list.end()); j != end; ++j, iter += fieldType.Size()) {
 302                                                 fieldType.Construct(iter);
 303                                                 ReadObject(fieldType.TypeId(), -1, iter, **j);
 304                                         }
 305                                 } else {
 306                                         const vector<Value *> &list(i->second->GetLiteral().GetValues());
 307                                         for (vector<Value *>::const_iterator j(list.begin()), end(list.end()); j != end; ++j, iter += fieldType.Size()) {
 308                                                 fieldType.Construct(iter);
 309                                                 ReadLiteral(fieldType.TypeId(), -1, iter, (*j)->GetLiteral());
 310                                         }
 311                                 }
 312                                 if (fd.IsReferenced()) {
 313                                         std::memcpy(dest, &aggregate, sizeof(char *));
 314                                         dest += sizeof(char *);
 315                                         std::memcpy(dest, &arraySize, sizeof(int));
 316                                 } else {
 317                                         throw Error("aggregate type fields must be referenced");
 318                                 }
 319                         } else if (i->second->IsLiteral() && !fd.IsReferenced()) {
 320                                 // inline literals
 321                                 if (i->second->GetLiteral().IsObject()) {
 322                                         ReadObject(fd.TypeId(), -1, dest, *i->second->GetLiteral().GetProperties());
 323                                 } else {
 324                                         ReadLiteral(fd.TypeId(), -1, dest, i->second->GetLiteral());
 325                                 }
 326                         } else {
 327                                 char *src(reinterpret_cast<char *>(GetObject(fd.TypeId(), *i->second)));
 328                                 if (fd.TypeId() == TypeDescription::GetTypeId("Image")) {
 329                                         src = reinterpret_cast<char *>(GetImage(src));
 330                                 }
 331                                 if (fd.IsReferenced()) {
 332                                         std::memcpy(dest, &src, sizeof(char *));
 333                                 } else {
 334                                         std::memcpy(dest, src, fieldType.Size());
 335                                 }
 336                         }
 337                 } else {
 338                         Postpone(typeId, id, fd.Offset(), i->second->GetIdentifier(), fd.TypeId(), !fd.IsReferenced());
 339                 }
 340         }
 341         td.Load(object);
 342 }
 343
 344
 345 void Interpreter::ReadScript(const std::vector<ScriptToken *> &s, Script *script) {
 346         int size(0);
 347         for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
 348                 if ((*i)->GetType() != ScriptToken::COMMAND) {
 349                         throw Error("unexpected script token");
 350                 }
 351                 ++size;
 352                 const string &cmd((*i)->CommandName());
 353                 if (cmd == "move") {
 354                         ++i;
 355                         if (i == end) {
 356                                 throw Error("unexpected script end after move");
 357                         }
 358                         const string &reg((*i)->RegisterName());
 359                         switch (reg[0]) {
 360                                 case 'a':
 361                                         size += sizeof(void *);
 362                                         break;
 363                                 case 'i':
 364                                         size += sizeof(int);
 365                                         break;
 366                                 case 'v':
 367                                         size += sizeof(Vector<int>);
 368                                         break;
 369                                 default:
 370                                         throw Error("unknown register " + reg);
 371                         }
 372                         ++i;
 373                         if (i == end) {
 374                                 throw Error("unexpected script end after move");
 375                         }
 376                 } else if (cmd == "add") {
 377                         ++i;
 378                         if (i == end) {
 379                                 throw Error("unexpected script end after add");
 380                         }
 381                         const string &reg((*i)->RegisterName());
 382                         switch (reg[0]) {
 383                                 case 'i':
 384                                         size += sizeof(int);
 385                                         break;
 386                                 case 'v':
 387                                         size += sizeof(Vector<int>);
 388                                         break;
 389                                 default:
 390                                         throw Error("expected register after add " + reg);
 391                         }
 392                         ++i;
 393                         if (i == end) {
 394                                 throw Error("unexpected script end after add");
 395                         }
 396                 } else if (cmd == "mod") {
 397                         ++i;
 398                         if (i == end) {
 399                                 throw Error("unexpected script end after mod");
 400                         }
 401                         size += sizeof(int);
 402                         ++i;
 403                         if (i == end) {
 404                                 throw Error("unexpected script end after mod");
 405                         }
 406                 } else if (cmd == "rand") {
 407                         ++i;
 408                         if (i == end) {
 409                                 throw Error("unexpected script end after rand");
 410                         }
 411                         size += sizeof(int);
 412                         ++i;
 413                         if (i == end) {
 414                                 throw Error("unexpected script end after rand");
 415                         }
 416                 } else if (cmd == "sysc") {
 417
 418                 } else {
 419                         throw Error("unknown command " + cmd);
 420                 }
 421         }
 422
 423         unsigned char *text(reinterpret_cast<unsigned char *>(alloc.Alloc(size)));
 424         int cursor(0);
 425         for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
 426                 if ((*i)->GetType() != ScriptToken::COMMAND) {
 427                         throw Error("unexpected script token");
 428                 }
 429                 const string &cmd((*i)->CommandName());
 430                 if (cmd == "move") {
 431                         ++i;
 432                         const string &reg((*i)->RegisterName());
 433                         ++i;
 434                         if (reg == "a0") {
 435                                 text[cursor] = Script::CODE_MOVE_A0;
 436                                 ++cursor;
 437                                 ReadScriptAddress(**i, text + cursor);
 438                                 cursor += sizeof(void *);
 439                         } else if (reg == "a1") {
 440                                 text[cursor] = Script::CODE_MOVE_A1;
 441                                 ++cursor;
 442                                 ReadScriptAddress(**i, text + cursor);
 443                                 cursor += sizeof(void *);
 444                         } else if (reg == "i0") {
 445                                 text[cursor] = Script::CODE_MOVE_I0;
 446                                 ++cursor;
 447                                 ReadScriptInteger(**i, text + cursor);
 448                                 cursor += sizeof(int);
 449                         } else if (reg == "i1") {
 450                                 text[cursor] = Script::CODE_MOVE_I1;
 451                                 ++cursor;
 452                                 ReadScriptInteger(**i, text + cursor);
 453                                 cursor += sizeof(int);
 454                         } else if (reg == "v0") {
 455                                 text[cursor] = Script::CODE_MOVE_V0;
 456                                 ++cursor;
 457                                 ReadScriptVector(**i, text + cursor);
 458                                 cursor += sizeof(Vector<int>);
 459                         } else if (reg == "v1") {
 460                                 text[cursor] = Script::CODE_MOVE_V1;
 461                                 ++cursor;
 462                                 ReadScriptVector(**i, text + cursor);
 463                                 cursor += sizeof(Vector<int>);
 464                         } else {
 465                                 throw Error("unknown register " + reg);
 466                         }
 467                 } else if (cmd == "add") {
 468                         ++i;
 469                         const string &reg((*i)->RegisterName());
 470                         ++i;
 471                         if (reg == "i0") {
 472                                 text[cursor] = Script::CODE_ADD_I0;
 473                                 ++cursor;
 474                                 ReadScriptInteger(**i, text + cursor);
 475                                 cursor += sizeof(int);
 476                         } else if (reg == "i1") {
 477                                 text[cursor] = Script::CODE_ADD_I1;
 478                                 ++cursor;
 479                                 ReadScriptInteger(**i, text + cursor);
 480                                 cursor += sizeof(int);
 481                         } else if (reg == "v0") {
 482                                 text[cursor] = Script::CODE_ADD_V0;
 483                                 ++cursor;
 484                                 ReadScriptVector(**i, text + cursor);
 485                                 cursor += sizeof(Vector<int>);
 486                         } else if (reg == "v1") {
 487                                 text[cursor] = Script::CODE_ADD_V1;
 488                                 ++cursor;
 489                                 ReadScriptVector(**i, text + cursor);
 490                                 cursor += sizeof(Vector<int>);
 491                         } else {
 492                                 throw Error("unexpected register " + reg);
 493                         }
 494                 } else if (cmd == "mod") {
 495                         ++i;
 496                         const string &reg((*i)->RegisterName());
 497                         ++i;
 498                         if (reg == "i0") {
 499                                 text[cursor] = Script::CODE_MOD_I0;
 500                                 ++cursor;
 501                                 ReadScriptInteger(**i, text + cursor);
 502                                 cursor += sizeof(int);
 503                         } else if (reg == "i1") {
 504                                 text[cursor] = Script::CODE_MOD_I1;
 505                                 ++cursor;
 506                                 ReadScriptInteger(**i, text + cursor);
 507                                 cursor += sizeof(int);
 508                         } else {
 509                                 throw Error("unexpected register " + reg);
 510                         }
 511                 } else if (cmd == "rand") {
 512                         ++i;
 513                         const string &reg((*i)->RegisterName());
 514                         if (reg == "i0") {
 515                                 text[cursor] = Script::CODE_RAND_I0;
 516                                 ++cursor;
 517                         } else if (reg == "i1") {
 518                                 text[cursor] = Script::CODE_RAND_I1;
 519                                 ++cursor;
 520                         } else {
 521                                 throw Error("unexpected register " + reg);
 522                         }
 523                 } else if (cmd == "sysc") {
 524                         text[cursor] = Script::CODE_SYSCALL;
 525                         ++cursor;
 526                 } else {
 527                         throw Error("unknown command " + cmd);
 528                 }
 529         }
 530
 531         script->text = text;
 532         script->textlen = size;
 533 }
 534
 535 char *Interpreter::ReadScript(const vector<ScriptToken *> &s) {
 536         char *mem(alloc.Alloc(sizeof(Script)));
 537         new (mem) Script;
 538         Script *script(reinterpret_cast<Script *>(mem));
 539         ReadScript(s, script);
 540         return mem;
 541 }
 542
 543 void Interpreter::ReadScriptAddress(const ScriptToken &t, unsigned char *dest) {
 544         if (t.GetType() != ScriptToken::IDENTIFIER) {
 545                 throw Error("expected identifier for address");
 546         }
 547         if (source.IsDefined(t.GetIdentifier())) {
 548                 const ParsedDefinition &def(GetDefinition(t.GetIdentifier()));
 549                 void *addr(GetObject(def.type, t.GetIdentifier()));
 550                 *reinterpret_cast<void **>(dest) = addr;
 551         } else {
 552                 throw Error("postponing values in scripts not implemented");
 553         }
 554 }
 555
 556 void Interpreter::ReadScriptInteger(const ScriptToken &t, unsigned char *dest) {
 557         if (t.GetType() == ScriptToken::IDENTIFIER) {
 558                 if (source.IsDefined(t.GetIdentifier())) {
 559                         void *num(GetObject(TypeDescription::GetTypeId("Number"), t.GetIdentifier()));
 560                         *reinterpret_cast<int *>(dest) = *reinterpret_cast<int *>(num);
 561                 } else {
 562                         throw Error("postponing values in scripts not implemented");
 563                 }
 564         } else if (t.GetType() == ScriptToken::LITERAL) {
 565                 *reinterpret_cast<int *>(dest) = t.GetLiteral()->GetNumber();
 566         } else {
 567                 throw Error("expected identifier or integer literal");
 568         }
 569 }
 570
 571 void Interpreter::ReadScriptVector(const ScriptToken &t, unsigned char *dest) {
 572         if (t.GetType() == ScriptToken::IDENTIFIER) {
 573                 if (source.IsDefined(t.GetIdentifier())) {
 574                         void *vec(GetObject(TypeDescription::GetTypeId("Vector"), t.GetIdentifier()));
 575                         *reinterpret_cast<Vector<int> *>(dest) = *reinterpret_cast<Vector<int> *>(vec);
 576                 } else {
 577                         throw Error("postponing values in scripts not implemented");
 578                 }
 579         } else if (t.GetType() == ScriptToken::LITERAL) {
 580                 *reinterpret_cast<Vector<int> *>(dest) = Vector<int>(t.GetLiteral()->GetX(), t.GetLiteral()->GetY());
 581         } else {
 582                 throw Error("expected identifier or vector literal");
 583         }
 584 }
 585
 586
 587 SDL_Surface *Interpreter::GetImage(const string &path) {
 588         std::map<string, SDL_Surface *>::const_iterator result(imageCache.find(path));
 589         if (result != imageCache.end()) {
 590                 return result->second;
 591         } else {
 592                 SDL_Surface *image(IMG_Load(path.c_str()));
 593                 imageCache.insert(make_pair(path, image));
 594                 return image;
 595         }
 596 }
 597
 598
 599 bool Interpreter::CanLink(const Value &v) const {
 600         return v.IsLiteral() || source.IsDefined(v.GetIdentifier());
 601 }
 602
 603 void Interpreter::Postpone(int type, int id, std::ptrdiff_t offset, const std::string &identifier, int linkedType, bool inlined) {
 604         char *str(alloc.Alloc(identifier.size() + 1));
 605         std::memcpy(str, identifier.c_str(), identifier.size());
 606         str[identifier.size()] = '\0';
 607         postponedDefinitions.push_back(PostponedDefinition(type, id, offset, str, linkedType, inlined));
 608 }
 609
 610
 611 void Interpreter::CreateTypeDescriptions() {
 612         {
 613                 TypeDescription &td(TypeDescription::CreateOrGet("Boolean"));
 614                 td.SetDescription("Logical value which can be either true or false.");
 615                 td.SetSize(sizeof(bool));
 616         }
 617         {
 618                 TypeDescription &td(TypeDescription::CreateOrGet("Color"));
 619                 td.SetDescription(
 620                                 "A color in RGB format with an optional alpha channel.\n"
 621                                 "Components range from 0 to 255.\n"
 622                                 "Alpha defaults to 255 if omitted.");
 623                 td.SetSize(sizeof(Color));
 624         }
 625         {
 626                 TypeDescription &td(TypeDescription::CreateOrGet("Image"));
 627                 td.SetDescription("Path to a PNG file with image data.");
 628                 td.SetSize(sizeof(SDL_Surface));
 629         }
 630         {
 631                 TypeDescription &td(TypeDescription::CreateOrGet("Number"));
 632                 td.SetDescription("A signed integer.");
 633                 td.SetSize(sizeof(int));
 634         }
 635         {
 636                 int stringId(TypeDescription::GetTypeId("String"));
 637                 TypeDescription &td(TypeDescription::CreateOrGet("Path"));
 638                 td.SetDescription("A path in the filesystem which is interpreted relative to the source file's location.");
 639                 td.SetSize(1);
 640                 td.AddSupertype(stringId, 0);
 641         }
 642         {
 643                 TypeDescription &td(TypeDescription::CreateOrGet("Script"));
 644                 td.SetDescription("Collection of commands that define a behaviour.");
 645                 td.SetSize(sizeof(Script));
 646         }
 647         {
 648                 TypeDescription &td(TypeDescription::CreateOrGet("String"));
 649                 td.SetDescription("Some characters.");
 650                 td.SetSize(1);
 651         }
 652         {
 653                 TypeDescription &td(TypeDescription::CreateOrGet("Vector"));
 654                 td.SetDescription("A pair of numbers usually describing a 2D translation or offset.");
 655                 td.SetSize(sizeof(Vector<int>));
 656         }
 657 }
 658
 659 }