(svn r16113) -Feature [NoAI]: Add UseAsRandomAI as function in info.nut. When an AI returns false, it'll never be chosen as random AI.

src/ai/ai_info.cpp

@@ -66,6 +66,12 @@ AILibrary::~AILibrary()
 	} else {
 		info->min_loadable_version = info->GetVersion();
 	}
+	/* When there is an UseAsRandomAI function, call it. */
+	if (info->engine->MethodExists(*info->SQ_instance, "UseAsRandomAI")) {
+		if (!info->engine->CallBoolMethod(*info->SQ_instance, "UseAsRandomAI", &info->use_as_random)) return SQ_ERROR;
+	} else {
+		info->use_as_random = true;
+	}
 
 	/* Remove the link to the real instance, else it might get deleted by RegisterAI() */
 	sq_setinstanceup(vm, 2, NULL);

src/ai/ai_info.hpp

@@ -94,9 +94,15 @@ public:
 	 */
 	int GetSettingDefaultValue(const char *name) const;
 
+	/**
+	 * Use this AI as a random AI.
+	 */
+	bool UseAsRandomAI() const { return this->use_as_random; }
+
 private:
 	AIConfigItemList config_list;
 	int min_loadable_version;
+	bool use_as_random;
 };
 
 class AILibrary : public AIFileInfo {

src/ai/ai_scanner.cpp

@@ -243,20 +243,31 @@ void AIScanner::RegisterAI(AIInfo *info)
 
 AIInfo *AIScanner::SelectRandomAI()
 {
-	if (this->info_single_list.size() == 0) {
+	uint num_random_ais = 0;
+	for (AIInfoList::iterator it = this->info_single_list.begin(); it != this->info_single_list.end(); it++) {
+		if (it->second->UseAsRandomAI()) num_random_ais++;
+	}
+
+	if (num_random_ais == 0) {
 		DEBUG(ai, 0, "No suitable AI found, loading 'dummy' AI.");
 		return this->info_dummy;
 	}
 
 	/* Find a random AI */
 	uint pos;
-	if (_networking) pos = InteractiveRandomRange((uint16)this->info_single_list.size());
-	else             pos =            RandomRange((uint16)this->info_single_list.size());
+	if (_networking) {
+		pos = InteractiveRandomRange(num_random_ais);
+	} else {
+		pos = RandomRange(num_random_ais);
+	}
 
 	/* Find the Nth item from the array */
 	AIInfoList::iterator it = this->info_single_list.begin();
-	for (; pos > 0; pos--) it++;
-	AIInfoList::iterator first_it = it;
+	while (!it->second->UseAsRandomAI()) it++;
+	for (; pos > 0; pos--) {
+		it++;
+		while (!it->second->UseAsRandomAI()) it++;
+	}
 	return (*it).second;
 }
 

src/script/squirrel.cpp

@@ -234,6 +234,15 @@ bool Squirrel::CallIntegerMethod(HSQOBJECT instance, const char *method_name, in
 	return true;
 }
 
+bool Squirrel::CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend)
+{
+	HSQOBJECT ret;
+	if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
+	if (ret._type != OT_BOOL) return false;
+	*res = ObjectToBool(&ret);
+	return true;
+}
+
 /* static */ bool Squirrel::CreateClassInstanceVM(HSQUIRRELVM vm, const char *class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook)
 {
 	int oldtop = sq_gettop(vm);

src/script/squirrel.hpp

@@ -116,6 +116,7 @@ public:
 	bool CallMethod(HSQOBJECT instance, const char *method_name, int suspend = -1) { return this->CallMethod(instance, method_name, NULL, suspend); }
 	bool CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, const char **res, int suspend = -1);
 	bool CallIntegerMethod(HSQOBJECT instance, const char *method_name, int *res, int suspend = -1);
+	bool CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend = -1);
 
 	/**
 	 * Check if a method exists in an instance.
@@ -161,6 +162,11 @@ public:
 	 */
 	static int ObjectToInteger(HSQOBJECT *ptr) { return sq_objtointeger(ptr); }
 
+	/**
+	 * Convert a Squirrel-object to a bool.
+	 */
+	static bool ObjectToBool(HSQOBJECT *ptr) { return sq_objtobool(ptr) == 1; }
+
 	/**
 	 * Sets a pointer in the VM that is reachable from where ever you are in SQ.
 	 *  Useful to keep track of the main instance.