X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;f=src%2Floader%2FInterpreter.cpp;h=a1fdc8250639ec81ee3e9613e06dcf37ddb401d5;hb=04e4e8797a63c0a89aae9882982cd864213d05ab;hp=5da1ff35a194f194606c573be575d797643e5486;hpb=754442d4502b743a46831055484c3fa9fa621ec2;p=l2e.git

diff --git a/src/loader/Interpreter.cpp b/src/loader/Interpreter.cpp
index 5da1ff3..a1fdc82 100644
--- a/src/loader/Interpreter.cpp
+++ b/src/loader/Interpreter.cpp
@@ -1,19 +1,14 @@
-/*
- * Interpreter.cpp
- *
- *  Created on: Aug 26, 2012
- *      Author: holy
- */
-
 #include "Interpreter.h"
 
 #include "ParsedSource.h"
+#include "TypeDescription.h"
 #include "../battle/Hero.h"
 #include "../battle/Monster.h"
 #include "../battle/PartyLayout.h"
 #include "../battle/Resources.h"
 #include "../common/Ikari.h"
 #include "../common/Item.h"
+#include "../common/Script.h"
 #include "../common/Spell.h"
 #include "../common/Stats.h"
 #include "../common/TargetingMode.h"
@@ -34,6 +29,7 @@ using battle::Monster;
 using battle::PartyLayout;
 using common::Ikari;
 using common::Item;
+using common::Script;
 using common::Spell;
 using common::Stats;
 using common::TargetingMode;
@@ -45,7 +41,7 @@ using graphics::Gauge;
 using graphics::ComplexAnimation;
 using graphics::SimpleAnimation;
 using graphics::Sprite;
-using geometry::Vector;
+using math::Vector;
 using std::make_pair;
 using std::set;
 using std::string;
@@ -60,24 +56,76 @@ Interpreter::~Interpreter() {
 }
 
 
+const Interpreter::ParsedDefinition &Interpreter::GetDefinition(const string &identifier) {
+	std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(identifier));
+	if (i != parsedDefinitions.end()) {
+		return i->second;
+	} else if (source.IsDefined(identifier)) {
+		ReadDefinition(source.GetDefinition(identifier));
+		return parsedDefinitions.at(identifier);
+	} else {
+		throw Error("access to undefined object " + identifier);
+	}
+}
+
 const Interpreter::ParsedDefinition &Interpreter::GetDefinition(const string &identifier) const {
-	return parsedDefinitions.at(identifier);
+	std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(identifier));
+	if (i != parsedDefinitions.end()) {
+		return i->second;
+	} else {
+		throw Error("access to undefined object " + identifier);
+	}
 }
 
 
-void *Interpreter::GetObject(int typeId, const std::string &name) {
-	std::map<string, ParsedDefinition>::const_iterator i(parsedDefinitions.find(name));
+void *Interpreter::GetObject(
+		int typeId,
+		const std::string &name) {
+	std::map<string, ParsedDefinition>::const_iterator
+			i(parsedDefinitions.find(name));
 	if (i != parsedDefinitions.end()) {
-		const TypeDescription &requested(TypeDescription::Get(typeId));
-		const TypeDescription &actual(TypeDescription::Get(i->second.type));
+		const TypeDescription &requested =
+				TypeDescription::Get(typeId);
+		const TypeDescription &actual =
+				TypeDescription::Get(i->second.type);
 		if (requested.TypeId() == actual.TypeId()) {
 			return values[actual.TypeId()][i->second.id];
 		} else if (actual.IsSubtypeOf(requested)) {
-			char *sub(reinterpret_cast<char *>(values[actual.TypeId()][i->second.id]));
-			std::ptrdiff_t offset(actual.SupertypeOffset(requested));
+			char *sub = reinterpret_cast<char *>(
+					values[actual.TypeId()][i->second.id]);
+			std::ptrdiff_t offset =
+					actual.SupertypeOffset(requested);
+			return sub - offset;
+		} else {
+			throw Error("cannot cast " + actual.TypeName()
+					+ " to " + requested.TypeName());
+		}
+	} else {
+		throw Error("access to undefined object " + name);
+	}
+}
+
+const void *Interpreter::GetObject(
+		int typeId,
+		const std::string &name) const {
+	std::map<string, ParsedDefinition>::const_iterator
+			i(parsedDefinitions.find(name));
+	if (i != parsedDefinitions.end()) {
+		const TypeDescription &requested =
+				TypeDescription::Get(typeId);
+		const TypeDescription &actual =
+				TypeDescription::Get(i->second.type);
+		if (requested.TypeId() == actual.TypeId()) {
+			return values.at(actual.TypeId()).at(i->second.id);
+		} else if (actual.IsSubtypeOf(requested)) {
+			char *sub = reinterpret_cast<char *>(
+					values.at(actual.TypeId()).at(i->second.id));
+			std::ptrdiff_t offset =
+					actual.SupertypeOffset(requested);
 			return sub - offset;
 		} else {
-			throw Error("cannot cast " + actual.TypeName() + " to " + requested.TypeName());
+			throw Error("cannot cast " + actual.TypeName()
+					+ " to " + requested.TypeName());
 		}
 	} else {
 		throw Error("access to undefined object " + name);
@@ -112,22 +160,21 @@ void Interpreter::ReadLiteral(const Definition &dfn) {
 					|| dfn.GetLiteral()->GetType() == Literal::STRING)
 			? dfn.GetLiteral()->GetString().size() : td.Size());
 	char *object(alloc.Alloc(size));
+	values[typeId].push_back(object);
+	parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 	if (dfn.GetLiteral()->GetType() == Literal::OBJECT) {
 		ReadObject(typeId, id, object, *dfn.GetLiteral()->GetProperties());
 	} else {
 		ReadLiteral(typeId, id, object, *dfn.GetLiteral());
 	}
-	values[typeId].push_back(object);
-	parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
 }
 
 void Interpreter::ReadLiteral(int typeId, int id, char *object, const Literal &literal) {
 	switch (literal.GetType()) {
 		case Literal::ARRAY_VALUES:
-			throw Error("named value arrays are not supported, sorry");
-			break;
 		case Literal::ARRAY_PROPS:
-			throw Error("named property list arrays are not supported, sorry");
+		case Literal::ARRAY_IDENTS:
+			throw Error("named arrays are not supported, sorry");
 			break;
 		case Literal::BOOLEAN:
 			new (object) bool(literal.GetBoolean());
@@ -142,6 +189,10 @@ void Interpreter::ReadLiteral(int typeId, int id, char *object, const Literal &l
 			std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 			object[literal.GetString().size()] = '\0';
 			break;
+		case Literal::SCRIPT:
+			new (object) Script;
+			ReadScript(literal.GetScript(), reinterpret_cast<Script *>(object));
+			break;
 		case Literal::STRING:
 			std::memcpy(object, literal.GetString().c_str(), literal.GetString().size());
 			object[literal.GetString().size()] = '\0';
@@ -151,7 +202,6 @@ void Interpreter::ReadLiteral(int typeId, int id, char *object, const Literal &l
 			break;
 		case Literal::OBJECT:
 			throw Error("illogical branch: read literal object as non-object literal");
-			break;
 	}
 }
 
@@ -171,10 +221,9 @@ void *Interpreter::GetObject(int typeId, const Value &v) {
 			int typeId(0), id(0);
 			switch (v.GetLiteral().GetType()) {
 				case Literal::ARRAY_VALUES:
-					throw Error("cannot copy value arrays, sorry");
-					break;
 				case Literal::ARRAY_PROPS:
-					throw Error("cannot copy property list arrays, sorry");
+				case Literal::ARRAY_IDENTS:
+					throw Error("cannot copy arrays, sorry");
 					break;
 				case Literal::BOOLEAN:
 					{
@@ -213,6 +262,14 @@ void *Interpreter::GetObject(int typeId, const Value &v) {
 						values[typeId].push_back(str);
 					}
 					break;
+				case Literal::SCRIPT:
+					{
+						typeId = TypeDescription::GetTypeId("Script");
+						char *script(ReadScript(v.GetLiteral().GetScript()));
+						id = values[typeId].size();
+						values[typeId].push_back(script);
+					}
+					break;
 				case Literal::STRING:
 					{
 						typeId = TypeDescription::GetTypeId("String");
@@ -259,8 +316,8 @@ void Interpreter::ReadObject(const Definition &dfn) {
 	char *object(alloc.Alloc(td.Size()));
 	td.Construct(object);
 	values[typeId].push_back(object);
-	ReadObject(typeId, id, object, *dfn.GetProperties());
 	parsedDefinitions.insert(make_pair(dfn.Identifier(), ParsedDefinition(&dfn, typeId, id)));
+	ReadObject(typeId, id, object, *dfn.GetProperties());
 }
 
 
@@ -273,27 +330,71 @@ void Interpreter::ReadObject(int typeId, int id, char *object, const PropertyLis
 			char *dest(object + fd.Offset());
 			if (fd.IsAggregate()) {
 				int arraySize(i->second->GetLiteral().ArraySize());
-				char *aggregate(alloc.Alloc(fieldType.Size() * arraySize));
-				char *iter(aggregate);
+				size_t memberSize = fd.IsReferenced() ? sizeof(char *) : fieldType.Size();
+				Array array;
+				array.typeId = fd.TypeId();
+				array.size = arraySize * memberSize;
+				array.data = alloc.Alloc(array.size);
+				array.ref = fd.IsReferenced();
+				arrays.push_back(array);
+				std::memset(array.data, 0, array.size);
+				char *iter = reinterpret_cast<char *>(array.data);
 				if (i->second->GetLiteral().GetType() == Literal::ARRAY_PROPS) {
 					const vector<PropertyList *> &list(i->second->GetLiteral().GetPropertyLists());
-					for (vector<PropertyList *>::const_iterator j(list.begin()), end(list.end()); j != end; ++j, iter += fieldType.Size()) {
-						fieldType.Construct(iter);
-						ReadObject(fieldType.TypeId(), -1, iter, **j);
+					for (vector<PropertyList *>::const_iterator
+							j(list.begin()), end(list.end());
+							j != end; ++j, iter += memberSize) {
+						char *member;
+						if (fd.IsReferenced()) {
+							member = alloc.Alloc(fieldType.Size());
+							*reinterpret_cast<char **>(iter) = member;
+						} else {
+							member = iter;
+						}
+						fieldType.Construct(member);
+						ReadObject(fieldType.TypeId(), -1, member, **j);
 					}
-				} else {
+				} else if (i->second->GetLiteral().GetType() == Literal::ARRAY_VALUES) {
 					const vector<Value *> &list(i->second->GetLiteral().GetValues());
-					for (vector<Value *>::const_iterator j(list.begin()), end(list.end()); j != end; ++j, iter += fieldType.Size()) {
-						fieldType.Construct(iter);
-						ReadLiteral(fieldType.TypeId(), -1, iter, (*j)->GetLiteral());
+					for (vector<Value *>::const_iterator j(list.begin()), end(list.end());
+							j != end; ++j, iter += memberSize) {
+						char *member;
+						if (fd.IsReferenced()) {
+							member = alloc.Alloc(fieldType.Size());
+							*reinterpret_cast<char **>(iter) = member;
+						} else {
+							member = iter;
+						}
+						fieldType.Construct(member);
+						ReadLiteral(fieldType.TypeId(), -1, member, (*j)->GetLiteral());
+					}
+				} else {
+					if (!fd.IsReferenced()) {
+						// TODO: implement inline identifier arrays
+						throw std::runtime_error("inline identifier arrays not implemented (yet)");
+					}
+					const vector<string> &list(i->second->GetLiteral().GetIdentifiers());
+					for (vector<string>::const_iterator j(list.begin()), end(list.end());
+							j != end; ++j, iter += memberSize) {
+						if (source.IsDefined(*j)) {
+							*reinterpret_cast<void **>(iter)
+									= GetObject(fd.TypeId(), *j);
+						} else {
+							Postpone(reinterpret_cast<char *>(array.data),
+									iter, *j, fd.TypeId(), false);
+						}
 					}
 				}
-				if (fd.IsReferenced()) {
-					std::memcpy(dest, &aggregate, sizeof(char *));
-					dest += sizeof(char *);
-					std::memcpy(dest, &arraySize, sizeof(int));
+				size_t pLen = sizeof(char *);
+				std::memcpy(dest, &array.data, pLen);
+				dest += sizeof(char *);
+				std::memcpy(dest, &arraySize, sizeof(int));
+			} else if (i->second->IsLiteral() && !fd.IsReferenced()) {
+				// inline literals
+				if (i->second->GetLiteral().IsObject()) {
+					ReadObject(fd.TypeId(), -1, dest, *i->second->GetLiteral().GetProperties());
 				} else {
-					throw Error("aggregate type fields must be referenced");
+					ReadLiteral(fd.TypeId(), -1, dest, i->second->GetLiteral());
 				}
 			} else {
 				char *src(reinterpret_cast<char *>(GetObject(fd.TypeId(), *i->second)));
@@ -307,13 +408,495 @@ void Interpreter::ReadObject(int typeId, int id, char *object, const PropertyLis
 				}
 			}
 		} else {
-			Postpone(typeId, id, fd.Offset(), i->second->GetIdentifier(), fd.TypeId(), !fd.IsReferenced());
+			Postpone(object, object + fd.Offset(), i->second->GetIdentifier(), fd.TypeId(), !fd.IsReferenced(), fd.IsAggregate());
 		}
 	}
 	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 += sizeof(Script::Code);
+		const string &cmd((*i)->CommandName());
+		if (cmd == "move") {
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after move");
+			}
+			const string &reg((*i)->RegisterName());
+			if (reg.size() != 2) {
+				throw Error("invalid register name " + reg);
+			}
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after move");
+			}
+			if ((*i)->GetType() != ScriptToken::REGISTER) {
+				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);
+				}
+			}
+		} else if (cmd == "add") {
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after add");
+			}
+			const string &reg((*i)->RegisterName());
+			if (reg.size() != 2) {
+				throw Error("invalid register name " + reg);
+			}
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after add");
+			}
+			if ((*i)->GetType() != ScriptToken::REGISTER) {
+				switch (reg[0]) {
+					case 'i':
+						size += sizeof(int);
+						break;
+					case 'v':
+						size += sizeof(Vector<int>);
+						break;
+					default:
+						throw Error("expected register after add " + reg);
+				}
+			}
+		} else if (cmd == "mod") {
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after mod");
+			}
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after mod");
+			}
+			if ((*i)->GetType() != ScriptToken::REGISTER) {
+				size += sizeof(int);
+			}
+		} else if (cmd == "rand") {
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after rand");
+			}
+		} else if (cmd == "cmp") {
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+			if ((*i)->GetType() != ScriptToken::REGISTER) {
+				size += sizeof(int);
+			}
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+			if ((*i)->GetType() != ScriptToken::REGISTER) {
+				size += sizeof(int);
+			}
+		} else if (cmd == "jmp") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jeq") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jne") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jl") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jle") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jg") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "jge") {
+			size += sizeof(int);
+			++i;
+			if (i == end) {
+				throw Error("unexpected script end after cmp");
+			}
+		} else if (cmd == "sysc") {
+
+		} else {
+			throw Error("unknown command " + cmd);
+		}
+	}
+
+	char *text(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") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_MOVE, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 2;
+			++i;
+			const string &reg((*i)->RegisterName());
+			switch (reg[0]) {
+				case 'a':
+					code.type = Script::TYPE_ADDRESS;
+					break;
+				case 'i':
+					code.type = Script::TYPE_INTEGER;
+					break;
+				case 'v':
+					code.type = Script::TYPE_VECTOR;
+					break;
+				default:
+					throw Error("invalid register " + reg);
+			}
+			int regnum(reg[1] - '0');
+			if (regnum < 0 || regnum > 6) {
+				throw Error("invalid register " + reg);
+			}
+			code.reg1 = regnum;
+			++i;
+
+			if ((*i)->GetType() == ScriptToken::REGISTER) {
+				string reg2((*i)->RegisterName());
+				if (reg[0] != reg2[0]) {
+					throw Error("mixed-type commands not allowed");
+				}
+				int reg2num(reg[1] - '0');
+				if (reg2num < 0 || reg2num > 6) {
+					throw Error("invalid register " + reg2);
+				}
+				code.reg2 = reg2num;
+			} else {
+				code.reg2 = 7;
+				switch (code.type) {
+					case Script::TYPE_ADDRESS:
+						ReadScriptAddress(**i, text + cursor);
+						cursor += sizeof(void *);
+						break;
+					case Script::TYPE_INTEGER:
+						ReadScriptInteger(**i, text + cursor);
+						cursor += sizeof(int);
+						break;
+					case Script::TYPE_VECTOR:
+						ReadScriptVector(**i, text + cursor);
+						cursor += sizeof(Vector<int>);
+						break;
+				}
+			}
+		} else if (cmd == "add") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_ADD, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 2;
+			++i;
+			const string &reg((*i)->RegisterName());
+			switch (reg[0]) {
+				case 'i':
+					code.type = Script::TYPE_INTEGER;
+					break;
+				case 'v':
+					code.type = Script::TYPE_VECTOR;
+					break;
+				default:
+					throw Error("invalid register " + reg);
+			}
+			int regnum(reg[1] - '0');
+			if (regnum < 0 || regnum > 6) {
+				throw Error("invalid register " + reg);
+			}
+			code.reg1 = regnum;
+			++i;
+
+			if ((*i)->GetType() == ScriptToken::REGISTER) {
+				string reg2((*i)->RegisterName());
+				if (reg[0] != reg2[0]) {
+					throw Error("mixed-type commands not allowed");
+				}
+				int reg2num(reg[1] - '0');
+				if (reg2num < 0 || reg2num > 6) {
+					throw Error("invalid register name " + reg2);
+				}
+				code.reg2 = reg2num;
+			} else {
+				code.reg2 = 7;
+				switch (code.type) {
+					case Script::TYPE_INTEGER:
+						ReadScriptInteger(**i, text + cursor);
+						cursor += sizeof(int);
+						break;
+					case Script::TYPE_VECTOR:
+						ReadScriptVector(**i, text + cursor);
+						cursor += sizeof(Vector<int>);
+						break;
+				}
+			}
+		} else if (cmd == "mod") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_MOD, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 2;
+			++i;
+			const string &reg((*i)->RegisterName());
+			if (reg[0] != 'i') {
+				throw Error("invalid register " + reg);
+			}
+			code.type = Script::TYPE_INTEGER;
+			int regnum(reg[1] - '0');
+			if (regnum < 0 || regnum > 6) {
+				throw Error("invalid register " + reg);
+			}
+			code.reg1 = regnum;
+			++i;
+
+			if ((*i)->GetType() == ScriptToken::REGISTER) {
+				string reg2((*i)->RegisterName());
+				if (reg[0] != reg2[0]) {
+					throw Error("mixed-type commands not allowed");
+				}
+				int reg2num(reg[1] - '0');
+				if (reg2num < 0 || reg2num > 6) {
+					throw Error("invalid register name " + reg2);
+				}
+				code.reg2 = reg2num;
+			} else {
+				code.reg2 = 7;
+				ReadScriptInteger(**i, text + cursor);
+				cursor += sizeof(int);
+			}
+		} else if (cmd == "rand") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_RAND, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			const string &reg((*i)->RegisterName());
+			if (reg[0] != 'i') {
+				throw Error("invalid register " + reg);
+			}
+			code.type = Script::TYPE_INTEGER;
+			int regnum(reg[1] - '0');
+			if (regnum < 0 || regnum > 6) {
+				throw Error("invalid register " + reg);
+			}
+			code.reg1 = regnum;
+		} else if (cmd == "cmp") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_CMP, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 2;
+			++i;
+			const string &reg((*i)->RegisterName());
+			if (reg[0] != 'i') {
+				throw Error("invalid register " + reg);
+			}
+			code.type = Script::TYPE_INTEGER;
+			int regnum(reg[1] - '0');
+			if (regnum < 0 || regnum > 6) {
+				throw Error("invalid register " + reg);
+			}
+			code.reg1 = regnum;
+			++i;
+
+			if ((*i)->GetType() == ScriptToken::REGISTER) {
+				string reg2((*i)->RegisterName());
+				if (reg[0] != reg2[0]) {
+					throw Error("mixed-type commands not allowed");
+				}
+				int reg2num(reg[1] - '0');
+				if (reg2num < 0 || reg2num > 6) {
+					throw Error("invalid register name " + reg2);
+				}
+				code.reg2 = reg2num;
+			} else {
+				code.reg2 = 7;
+				ReadScriptInteger(**i, text + cursor);
+				cursor += sizeof(int);
+			}
+		} else if (cmd == "jmp") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JMP, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jeq") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JEQ, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jne") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JNE, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jl") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JL, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jle") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JLE, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jg") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JG, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "jge") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_JGE, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 1;
+			++i;
+			if (!labels.count((*i)->Identifier())) {
+				throw Error("use of undefined label " + (*i)->Identifier());
+			}
+			*reinterpret_cast<int *>(text + cursor) = labels[(*i)->Identifier()];
+			cursor += sizeof(int);
+		} else if (cmd == "sysc") {
+			Script::Code &code(CreateScriptCode(Script::COMMAND_SYSC, text + cursor));
+			cursor += sizeof(Script::Code);
+			code.numParams = 0;
+		} 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;
+}
+
+Script::Code &Interpreter::CreateScriptCode(Script::Command c, char *dest) {
+	Script::Code &code(*reinterpret_cast<Script::Code *>(dest));
+	code.command = c;
+	code.numParams = 0;
+	code.type = Script::TYPE_NONE;
+	code.reg1 = 7;
+	code.reg2 = 7;
+	return code;
+}
+
+void Interpreter::ReadScriptAddress(const ScriptToken &t, 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, 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, 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()) {
@@ -325,27 +908,42 @@ SDL_Surface *Interpreter::GetImage(const string &path) {
 	}
 }
 
+const string &Interpreter::FindImage(SDL_Surface *img) const {
+	for (std::map<string, SDL_Surface *>::const_iterator
+			i(imageCache.begin()), end(imageCache.end());
+			i != end; ++i) {
+		if (i->second == img) {
+			return i->first;
+		}
+	}
+	throw Error("unable to locate 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::Postpone(
+		char *object,
+		char *dest,
+		const std::string &identifier,
+		int type,
+		bool inlined,
+		bool aggregate) {
+	postponedDefinitions.push_back(
+			PostponedDefinition(object, dest, identifier, type, inlined, aggregate));
 }
 
 
 void Interpreter::CreateTypeDescriptions() {
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("Boolean"));
+		TypeDescription &td(TypeDescription::Create(BOOLEAN_ID, "Boolean"));
 		td.SetDescription("Logical value which can be either true or false.");
 		td.SetSize(sizeof(bool));
 	}
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("Color"));
+		TypeDescription &td(TypeDescription::Create(COLOR_ID, "Color"));
 		td.SetDescription(
 				"A color in RGB format with an optional alpha channel.\n"
 				"Components range from 0 to 255.\n"
@@ -353,29 +951,35 @@ void Interpreter::CreateTypeDescriptions() {
 		td.SetSize(sizeof(Color));
 	}
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("Image"));
+		TypeDescription &td(TypeDescription::Create(IMAGE_ID, "Image"));
 		td.SetDescription("Path to a PNG file with image data.");
 		td.SetSize(sizeof(SDL_Surface));
 	}
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("Number"));
+		TypeDescription &td(TypeDescription::Create(NUMBER_ID, "Number"));
 		td.SetDescription("A signed integer.");
 		td.SetSize(sizeof(int));
 	}
 	{
-		int stringId(TypeDescription::GetTypeId("String"));
-		TypeDescription &td(TypeDescription::CreateOrGet("Path"));
+		TypeDescription &td(TypeDescription::Create(PATH_ID, "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);
+		td.AddSupertype(STRING_ID, 0);
+	}
+	{
+		Script s;
+		TypeDescription &td(TypeDescription::Create(SCRIPT_ID, "Script"));
+		td.SetDescription("Collection of commands that define a behaviour.");
+		td.SetSize(sizeof(Script));
+		td.AddField("text", FieldDescription(((char *)&s.text) - ((char *)&s), STRING_ID).SetAggregate());
 	}
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("String"));
+		TypeDescription &td(TypeDescription::Create(STRING_ID, "String"));
 		td.SetDescription("Some characters.");
 		td.SetSize(1);
 	}
 	{
-		TypeDescription &td(TypeDescription::CreateOrGet("Vector"));
+		TypeDescription &td(TypeDescription::Create(VECTOR_ID, "Vector"));
 		td.SetDescription("A pair of numbers usually describing a 2D translation or offset.");
 		td.SetSize(sizeof(Vector<int>));
 	}