+ td.Load(object);
+}
+
+
+void Interpreter::ReadScript(const std::vector<ScriptToken *> &s, Script *script) {
+ std::map<string, int> labels;
+ int size(0);
+ for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
+ if ((*i)->GetType() == ScriptToken::LABEL) {
+ if (labels.count((*i)->Label())) {
+ throw Error("duplicate label " + (*i)->Label());
+ } else {
+ labels[(*i)->Label()] = size;
+ }
+ } else if ((*i)->GetType() != ScriptToken::COMMAND) {
+ throw Error("unexpected script token");
+ }
+ ++size;
+ const string &cmd((*i)->CommandName());
+ if (cmd == "move") {
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after move");
+ }
+ const string ®((*i)->RegisterName());
+ switch (reg[0]) {
+ case 'a':
+ size += sizeof(void *);
+ break;
+ case 'i':
+ size += sizeof(int);
+ break;
+ case 'v':
+ size += sizeof(Vector<int>);
+ break;
+ default:
+ throw Error("unknown register " + reg);
+ }
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after move");
+ }
+ } else if (cmd == "add") {
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after add");
+ }
+ const string ®((*i)->RegisterName());
+ switch (reg[0]) {
+ case 'i':
+ size += sizeof(int);
+ break;
+ case 'v':
+ size += sizeof(Vector<int>);
+ break;
+ default:
+ throw Error("expected register after add " + reg);
+ }
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after add");
+ }
+ } else if (cmd == "mod") {
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after mod");
+ }
+ size += sizeof(int);
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after mod");
+ }
+ } else if (cmd == "rand") {
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after rand");
+ }
+ size += sizeof(int);
+ ++i;
+ if (i == end) {
+ throw Error("unexpected script end after rand");
+ }
+ } else if (cmd == "sysc") {
+
+ } else {
+ throw Error("unknown command " + cmd);
+ }
+ }
+
+ unsigned char *text(reinterpret_cast<unsigned char *>(alloc.Alloc(size)));
+ int cursor(0);
+ for (vector<ScriptToken *>::const_iterator i(s.begin()), end(s.end()); i != end; ++i) {
+ if ((*i)->GetType() == ScriptToken::LABEL) {
+ continue;
+ }
+ if ((*i)->GetType() != ScriptToken::COMMAND) {
+ throw Error("unexpected script token");
+ }
+ const string &cmd((*i)->CommandName());
+ if (cmd == "move") {
+ ++i;
+ const string ®((*i)->RegisterName());
+ ++i;
+ if (reg == "a0") {
+ text[cursor] = Script::CODE_MOVE_A0;
+ ++cursor;
+ ReadScriptAddress(**i, text + cursor);
+ cursor += sizeof(void *);
+ } else if (reg == "a1") {
+ text[cursor] = Script::CODE_MOVE_A1;
+ ++cursor;
+ ReadScriptAddress(**i, text + cursor);
+ cursor += sizeof(void *);
+ } else if (reg == "i0") {
+ text[cursor] = Script::CODE_MOVE_I0;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else if (reg == "i1") {
+ text[cursor] = Script::CODE_MOVE_I1;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else if (reg == "v0") {
+ text[cursor] = Script::CODE_MOVE_V0;
+ ++cursor;
+ ReadScriptVector(**i, text + cursor);
+ cursor += sizeof(Vector<int>);
+ } else if (reg == "v1") {
+ text[cursor] = Script::CODE_MOVE_V1;
+ ++cursor;
+ ReadScriptVector(**i, text + cursor);
+ cursor += sizeof(Vector<int>);
+ } else {
+ throw Error("unknown register " + reg);
+ }
+ } else if (cmd == "add") {
+ ++i;
+ const string ®((*i)->RegisterName());
+ ++i;
+ if (reg == "i0") {
+ text[cursor] = Script::CODE_ADD_I0;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else if (reg == "i1") {
+ text[cursor] = Script::CODE_ADD_I1;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else if (reg == "v0") {
+ text[cursor] = Script::CODE_ADD_V0;
+ ++cursor;
+ ReadScriptVector(**i, text + cursor);
+ cursor += sizeof(Vector<int>);
+ } else if (reg == "v1") {
+ text[cursor] = Script::CODE_ADD_V1;
+ ++cursor;
+ ReadScriptVector(**i, text + cursor);
+ cursor += sizeof(Vector<int>);
+ } else {
+ throw Error("unexpected register " + reg);
+ }
+ } else if (cmd == "mod") {
+ ++i;
+ const string ®((*i)->RegisterName());
+ ++i;
+ if (reg == "i0") {
+ text[cursor] = Script::CODE_MOD_I0;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else if (reg == "i1") {
+ text[cursor] = Script::CODE_MOD_I1;
+ ++cursor;
+ ReadScriptInteger(**i, text + cursor);
+ cursor += sizeof(int);
+ } else {
+ throw Error("unexpected register " + reg);
+ }
+ } else if (cmd == "rand") {
+ ++i;
+ const string ®((*i)->RegisterName());
+ if (reg == "i0") {
+ text[cursor] = Script::CODE_RAND_I0;
+ ++cursor;
+ } else if (reg == "i1") {
+ text[cursor] = Script::CODE_RAND_I1;
+ ++cursor;
+ } else {
+ throw Error("unexpected register " + reg);
+ }
+ } else if (cmd == "sysc") {
+ text[cursor] = Script::CODE_SYSCALL;
+ ++cursor;
+ } else {
+ throw Error("unknown command " + cmd);
+ }
+ }
+
+ script->text = text;
+ script->textlen = size;
+}
+
+char *Interpreter::ReadScript(const vector<ScriptToken *> &s) {
+ char *mem(alloc.Alloc(sizeof(Script)));
+ new (mem) Script;
+ Script *script(reinterpret_cast<Script *>(mem));
+ ReadScript(s, script);
+ return mem;
+}
+
+void Interpreter::ReadScriptAddress(const ScriptToken &t, unsigned char *dest) {
+ if (t.GetType() != ScriptToken::IDENTIFIER) {
+ throw Error("expected identifier for address");
+ }
+ if (source.IsDefined(t.Identifier())) {
+ const ParsedDefinition &def(GetDefinition(t.Identifier()));
+ void *addr(GetObject(def.type, t.Identifier()));
+ *reinterpret_cast<void **>(dest) = addr;
+ } else {
+ throw Error("postponing values in scripts not implemented");
+ }
+}
+
+void Interpreter::ReadScriptInteger(const ScriptToken &t, unsigned char *dest) {
+ if (t.GetType() == ScriptToken::IDENTIFIER) {
+ if (source.IsDefined(t.Identifier())) {
+ void *num(GetObject(TypeDescription::GetTypeId("Number"), t.Identifier()));
+ *reinterpret_cast<int *>(dest) = *reinterpret_cast<int *>(num);
+ } else {
+ throw Error("postponing values in scripts not implemented");
+ }
+ } else if (t.GetType() == ScriptToken::LITERAL) {
+ *reinterpret_cast<int *>(dest) = t.GetLiteral()->GetNumber();
+ } else {
+ throw Error("expected identifier or integer literal");
+ }
+}
+
+void Interpreter::ReadScriptVector(const ScriptToken &t, unsigned char *dest) {
+ if (t.GetType() == ScriptToken::IDENTIFIER) {
+ if (source.IsDefined(t.Identifier())) {
+ void *vec(GetObject(TypeDescription::GetTypeId("Vector"), t.Identifier()));
+ *reinterpret_cast<Vector<int> *>(dest) = *reinterpret_cast<Vector<int> *>(vec);
+ } else {
+ throw Error("postponing values in scripts not implemented");
+ }
+ } else if (t.GetType() == ScriptToken::LITERAL) {
+ *reinterpret_cast<Vector<int> *>(dest) = Vector<int>(t.GetLiteral()->GetX(), t.GetLiteral()->GetY());
+ } else {
+ throw Error("expected identifier or vector literal");
+ }
+}
+
+
+SDL_Surface *Interpreter::GetImage(const string &path) {
+ std::map<string, SDL_Surface *>::const_iterator result(imageCache.find(path));
+ if (result != imageCache.end()) {
+ return result->second;
+ } else {
+ SDL_Surface *image(IMG_Load(path.c_str()));
+ imageCache.insert(make_pair(path, image));
+ return image;
+ }
+}
+
+
+bool Interpreter::CanLink(const Value &v) const {
+ return v.IsLiteral() || source.IsDefined(v.GetIdentifier());
+}
+
+void Interpreter::Postpone(int type, int id, std::ptrdiff_t offset, const std::string &identifier, int linkedType, bool inlined) {
+ char *str(alloc.Alloc(identifier.size() + 1));
+ std::memcpy(str, identifier.c_str(), identifier.size());
+ str[identifier.size()] = '\0';
+ postponedDefinitions.push_back(PostponedDefinition(type, id, offset, str, linkedType, inlined));
+}
+
+
+void Interpreter::CreateTypeDescriptions() {
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Boolean"));
+ td.SetDescription("Logical value which can be either true or false.");
+ td.SetSize(sizeof(bool));
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Color"));
+ td.SetDescription(
+ "A color in RGB format with an optional alpha channel.\n"
+ "Components range from 0 to 255.\n"
+ "Alpha defaults to 255 if omitted.");
+ td.SetSize(sizeof(Color));
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Image"));
+ td.SetDescription("Path to a PNG file with image data.");
+ td.SetSize(sizeof(SDL_Surface));
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Number"));
+ td.SetDescription("A signed integer.");
+ td.SetSize(sizeof(int));
+ }
+ {
+ int stringId(TypeDescription::GetTypeId("String"));
+ TypeDescription &td(TypeDescription::CreateOrGet("Path"));
+ td.SetDescription("A path in the filesystem which is interpreted relative to the source file's location.");
+ td.SetSize(1);
+ td.AddSupertype(stringId, 0);
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Script"));
+ td.SetDescription("Collection of commands that define a behaviour.");
+ td.SetSize(sizeof(Script));
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("String"));
+ td.SetDescription("Some characters.");
+ td.SetSize(1);
+ }
+ {
+ TypeDescription &td(TypeDescription::CreateOrGet("Vector"));
+ td.SetDescription("A pair of numbers usually describing a 2D translation or offset.");
+ td.SetSize(sizeof(Vector<int>));
+ }