First version that works:

- Covered RMG with exceptions
- Fixes for object randomization & placement

lib/CRandomGenerator.h

@@ -98,6 +98,24 @@ public:
 namespace RandomGeneratorUtil
 {
 	/// Gets an iterator to an element of a nonempty container randomly. Undefined behaviour if container is empty.
+	//template<typename T>
+	//auto nextItem(const std::set<T> & container, CRandomGenerator & rand) -> decltype(std::begin(container))
+	//{
+	//	assert(!container.empty());
+	//	auto ret = container.begin();
+	//	std::advance(ret, rand.nextInt(container.size() - 1));
+	//	return ret;
+	//}
+
+	//template<typename T>
+	//auto nextItem(std::set<T> & container, CRandomGenerator & rand) -> decltype(std::begin(container))
+	//{
+	//	assert(!container.empty());
+	//	auto ret = container.begin();
+	//	std::advance(ret, rand.nextInt(container.size() - 1));
+	//	return ret;
+	//}
+
 	template<typename Container>
 	auto nextItem(const Container & container, CRandomGenerator & rand) -> decltype(std::begin(container))
 	{

lib/CTownHandler.cpp

@@ -815,3 +815,13 @@ std::vector<bool> CTownHandler::getDefaultAllowed() const
 	}
 	return allowedFactions;
 }
+std::set<TFaction> CTownHandler::getAllowedFactions() const
+{
+	std::set<TFaction> allowedFactions;
+	auto allowed = getDefaultAllowed();
+	for (size_t i=0; i<allowed.size(); i++)
+		if (allowed[i])
+			allowedFactions.insert(i);
+
+	return allowedFactions;
+}

lib/CTownHandler.h

@@ -270,6 +270,7 @@ public:
 	void afterLoadFinalization() override;
 
 	std::vector<bool> getDefaultAllowed() const override;
+	std::set<TFaction> getAllowedFactions() const;
 
 	template <typename Handler> void serialize(Handler &h, const int version)
 	{

lib/mapping/CMap.cpp

@@ -20,10 +20,7 @@ PlayerInfo::PlayerInfo(): canHumanPlay(false), canComputerPlay(false),
 	aiTactic(EAiTactic::RANDOM), isFactionRandom(false), mainCustomHeroPortrait(-1), mainCustomHeroId(-1), hasMainTown(false),
 	generateHeroAtMainTown(false), team(255), hasRandomHero(false), /* following are unused */ generateHero(false), p7(0), powerPlaceholders(-1)
 {
-	auto allowed = VLC->townh->getDefaultAllowed();
-	for (size_t i=0; i<allowed.size(); i++)
-		if (allowed[i])
-			allowedFactions.insert(i);
+	allowedFactions = VLC->townh->getAllowedFactions();
 }
 
 si8 PlayerInfo::defaultCastle() const

lib/rmg/CMapGenerator.cpp

@@ -26,16 +26,22 @@ CMapGenerator::~CMapGenerator()
 
 std::unique_ptr<CMap> CMapGenerator::generate()
 {
-	mapGenOptions->finalize(rand);
+		mapGenOptions->finalize(rand);
 
-	map = make_unique<CMap>();
-	editManager = map->getEditManager();
-	editManager->getUndoManager().setUndoRedoLimit(0);
-	addHeaderInfo();
-
-	genZones();
-	fillZones();
+		map = make_unique<CMap>();
+		editManager = map->getEditManager();
+	try
+	{
+		editManager->getUndoManager().setUndoRedoLimit(0);
+		addHeaderInfo();
 
+		genZones();
+		fillZones();
+	}
+	catch (rmgException &e)
+	{
+		logGlobal->infoStream() << "Random map generation received exception: " << e.what();
+	}
 	return std::move(map);
 }
 

lib/rmg/CMapGenerator.h

@@ -29,6 +29,24 @@ typedef std::vector<JsonNode> JsonVector;
 
 class CMapGenerator;
 
+class rmgException : std::exception
+{
+	std::string msg;
+public:
+	explicit rmgException(const std::string& _Message) : msg(_Message)
+	{
+	}
+
+	virtual ~rmgException() throw ()
+	{
+	};
+
+	const char *what() const throw () override
+	{
+		return msg.c_str();
+	}
+};
+
 /// The map generator creates a map randomly.
 class DLL_LINKAGE CMapGenerator
 {

lib/rmg/CRmgTemplateZone.cpp

@@ -32,7 +32,8 @@ int CRmgTemplateZone::CTownInfo::getTownCount() const
 
 void CRmgTemplateZone::CTownInfo::setTownCount(int value)
 {
-	if(value < 0) throw std::runtime_error("Negative value for town count not allowed.");
+	if(value < 0)
+		throw rmgException("Negative value for town count not allowed.");
 	townCount = value;
 }
 
@@ -43,7 +44,8 @@ int CRmgTemplateZone::CTownInfo::getCastleCount() const
 
 void CRmgTemplateZone::CTownInfo::setCastleCount(int value)
 {
-	if(value < 0) throw std::runtime_error("Negative value for castle count not allowed.");
+	if(value < 0)
+		throw rmgException("Negative value for castle count not allowed.");
 	castleCount = value;
 }
 
@@ -54,7 +56,8 @@ int CRmgTemplateZone::CTownInfo::getTownDensity() const
 
 void CRmgTemplateZone::CTownInfo::setTownDensity(int value)
 {
-	if(value < 0) throw std::runtime_error("Negative value for town density not allowed.");
+	if(value < 0)
+		throw rmgException("Negative value for town density not allowed.");
 	townDensity = value;
 }
 
@@ -65,7 +68,8 @@ int CRmgTemplateZone::CTownInfo::getCastleDensity() const
 
 void CRmgTemplateZone::CTownInfo::setCastleDensity(int value)
 {
-	if(value < 0) throw std::runtime_error("Negative value for castle density not allowed.");
+	if(value < 0)
+		throw rmgException("Negative value for castle density not allowed.");
 	castleDensity = value;
 }
 
@@ -81,7 +85,8 @@ int CRmgTemplateZone::CTileInfo::getNearestObjectDistance() const
 
 void CRmgTemplateZone::CTileInfo::setNearestObjectDistance(int value)
 {
-	if(value < 0) throw std::runtime_error("Negative value for nearest object distance not allowed.");
+	if(value < 0)
+		throw rmgException(boost::to_string(boost::format("Negative value %d for nearest object distance not allowed.") %value));
 	nearestObjectDistance = value;
 }
 
@@ -129,7 +134,8 @@ TRmgTemplateZoneId CRmgTemplateZone::getId() const
 
 void CRmgTemplateZone::setId(TRmgTemplateZoneId value)
 {
-	if(value <= 0) throw std::runtime_error("Zone id should be greater than 0.");
+	if(value <= 0)
+		throw rmgException(boost::to_string(boost::format("Zone %d id should be greater than 0.") %id));
 	id = value;
 }
 
@@ -149,7 +155,8 @@ int CRmgTemplateZone::getSize() const
 
 void CRmgTemplateZone::setSize(int value)
 {
-	if(value <= 0) throw std::runtime_error("Zone size needs to be greater than 0.");
+	if(value <= 0)
+		throw rmgException(boost::to_string(boost::format("Zone %d size needs to be greater than 0.") % id));
 	size = value;
 }
 
@@ -160,7 +167,8 @@ boost::optional<int> CRmgTemplateZone::getOwner() const
 
 void CRmgTemplateZone::setOwner(boost::optional<int> value)
 {
-	if(!(*value >= 0 && *value <= PlayerColor::PLAYER_LIMIT_I)) throw std::runtime_error("Owner has to be in range 0 to max player count.");
+	if(!(*value >= 0 && *value <= PlayerColor::PLAYER_LIMIT_I))
+		throw rmgException(boost::to_string(boost::format ("Owner of zone %d has to be in range 0 to max player count.") %id));
 	owner = value;
 }
 
@@ -291,7 +299,7 @@ void CRmgTemplateZone::setShape(std::vector<int3> shape)
 		if (z == -1)
 			z = point.z;
 		if (point.z != z)
-			throw std::runtime_error("Zone shape points should lie on same z.");
+			throw rmgException("Zone shape points should lie on same z.");
 		minx = std::min(minx, point.x);
 		maxx = std::max(maxx, point.x);
 		miny = std::min(miny, point.y);
@@ -343,7 +351,7 @@ bool CRmgTemplateZone::fill(CMapGenerator* gen)
 			int townId = gen->mapGenOptions->getPlayersSettings().find(player)->second.getStartingTown();
 
 			if(townId == CMapGenOptions::CPlayerSettings::RANDOM_TOWN)
-				townId = gen->rand.nextInt (VLC->townh->factions.size()); // all possible towns
+				townId = *RandomGeneratorUtil::nextItem(VLC->townh->getAllowedFactions(), gen->rand); // all possible towns, skip neutral
 
 			town->subID = townId;
 			town->tempOwner = player;
@@ -391,7 +399,7 @@ bool CRmgTemplateZone::fill(CMapGenerator* gen)
 		logGlobal->infoStream() << "Looking for place";
 		if ( ! findPlaceForObject(gen, obj, 3, pos))		
 		{
-			logGlobal->errorStream() << "Failed to fill zone due to lack of space";
+			logGlobal->errorStream() << boost::format("Failed to fill zone %d due to lack of space") %id;
 			//TODO CLEANUP!
 			return false;
 		}
@@ -445,7 +453,7 @@ bool CRmgTemplateZone::fill(CMapGenerator* gen)
 	}
 	logGlobal->infoStream() << boost::format("Filling %d with ROCK") % sel.getSelectedItems().size();
 	//gen->editManager->drawTerrain(ETerrainType::ROCK, &gen->gen);
-	logGlobal->infoStream() << "Zone filled successfully";
+	logGlobal->infoStream() << boost::format ("Zone %d filled successfully") %id;
 	return true;
 }
 
@@ -477,12 +485,28 @@ bool CRmgTemplateZone::findPlaceForObject(CMapGenerator* gen, CGObjectInstance*
 	return result;
 }
 
+void CRmgTemplateZone::checkAndPlaceObject(CMapGenerator* gen, CGObjectInstance* object, const int3 &pos)
+{
+	object->pos = pos;
+
+	if (!gen->map->isInTheMap(object->visitablePos()))
+		throw rmgException(boost::to_string(boost::format("Visitable tile %s of object %d at %s is outside the map") % object->visitablePos() % object->id % object->pos()));
+	for (auto tile : object->getBlockedPos())
+	{
+		if (!gen->map->isInTheMap(tile))
+			throw rmgException(boost::to_string(boost::format("Tile %s of object %d at %s is outside the map") % tile() % object->id % object->pos()));
+	}
+
+	gen->editManager->insertObject(object, pos);
+	logGlobal->infoStream() << boost::format ("Successfully inserted object (%d,%d) at pos %s") %object->ID %object->id %pos();
+}
+
 void CRmgTemplateZone::placeObject(CMapGenerator* gen, CGObjectInstance* object, const int3 &pos)
 {
-	logGlobal->infoStream() << boost::format("Insert object at %d %d") % pos.x % pos.y;
-	object->pos = pos;
-	gen->editManager->insertObject(object, pos);
-	logGlobal->infoStream() << "Inserted object";
+	logGlobal->infoStream() << boost::format("Inserting object at %d %d") % pos.x % pos.y;
+
+	checkAndPlaceObject (gen, object, pos);
+
 	auto points = object->getBlockedPos();
 	if (object->isVisitable())
 		points.emplace(pos + object->getVisitableOffset());
@@ -538,7 +562,6 @@ bool CRmgTemplateZone::guardObject(CMapGenerator* gen, CGObjectInstance* object,
 	//type will be set during initialization
 	guard->putStack(SlotID(0), hlp);
 
-	guard->pos = guard_tile;
-	gen->editManager->insertObject(guard, guard->pos);
+	checkAndPlaceObject(gen, guard, guard_tile);
 	return true;
 }

lib/rmg/CRmgTemplateZone.h

@@ -120,6 +120,7 @@ private:
 	int3 getCenter();
 	bool pointIsIn(int x, int y);
 	bool findPlaceForObject(CMapGenerator* gen, CGObjectInstance* obj, si32 min_dist, int3 &pos);
+	void checkAndPlaceObject(CMapGenerator* gen, CGObjectInstance* object, const int3 &pos);
 	void placeObject(CMapGenerator* gen, CGObjectInstance* object, const int3 &pos);
 	bool guardObject(CMapGenerator* gen, CGObjectInstance* object, si32 str);
 };