implemented Lua manager and unit data manager

luaManager.cpp

@@ -0,0 +1,79 @@
+#include "luaManager.h"
+
+#include <iostream>
+
+using namespace std;
+
+namespace battleship{
+		static LuaManager *luaManager = nullptr;
+
+		LuaManager* LuaManager::getSingleton(){
+				if(!luaManager) luaManager = new LuaManager();
+
+				return luaManager;
+		}
+
+		LuaManager::LuaManager(){
+				state = luaL_newstate();
+				luaL_openlibs(state);
+		}
+
+		void LuaManager::readFile(string file){
+				if(luaL_dofile(state, file.c_str()) && lua_pcall(state, 0, 0, 0))
+						cout << "Error reading Lua file" << file << "\n";
+		}
+
+		int LuaManager::getInt(string varName){
+				lua_getglobal(state, varName.c_str());
+				int isNum;
+				int var = (int)lua_tointegerx(state, -1, &isNum);
+				lua_pop(state, 1);
+				return var;
+		}
+
+		void LuaManager::prepareTableForRetrieval(string table, vector<Index> &indices){
+				lua_getglobal(state, table.c_str());
+
+				if(!lua_istable(state, -1))
+						cout << table << " is not a table\n";
+
+				for(int i = 0; i < indices.size(); i++){
+						if(indices[i].string)
+								lua_pushstring(state, indices[i].index.c_str());
+						else
+								lua_pushnumber(state, atoi(indices[i].index.c_str()));
+
+						lua_gettable(state, -2);
+				}
+		}
+
+		int LuaManager::getIntFromTable(string table, vector<Index> indices){
+				prepareTableForRetrieval(table, indices);
+
+				int isNum;
+				int result = lua_tointegerx(state, -1, &isNum);
+
+				lua_pop(state, 1 + indices.size());
+
+				return result;
+		}
+
+		float LuaManager::getFloatFromTable(string table, vector<Index> indices){
+				prepareTableForRetrieval(table, indices);
+
+				int isNum;
+				float result = lua_tonumberx(state, -1, &isNum);
+
+				lua_pop(state, 1 + indices.size());
+
+				return result;
+		}
+
+		string LuaManager::getStringFromTable(string table, vector<Index> indices){
+				prepareTableForRetrieval(table, indices);
+				string result = lua_tostring(state, -1);
+				lua_pop(state, 1 + indices.size());
+
+				return result;
+		}
+}