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@ -32,7 +32,7 @@ LuaScript::LuaScript()
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{
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L = luaL_newstate();
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if(!L)
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logFatal("could not create lua context");
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logFatal("FATAL ERROR: could not create lua context");
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// load lua standard libraries
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luaL_openlibs(L);
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@ -64,7 +64,7 @@ void LuaScript::loadAllModules()
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bool LuaScript::loadFile(const std::string& fileName)
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{
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if(!g_resources.fileExists(fileName)) {
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logError("script file '%s' doesn't exist", fileName.c_str());
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flogError("ERROR: script file '%s' doesn't exist", fileName.c_str());
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return false;
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}
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std::string fileContents = g_resources.loadTextFile(fileName);
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@ -114,11 +114,18 @@ int LuaScript::loadBufferAsFunction(const std::string& text, const std::string&
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void LuaScript::reportError(const std::string& errorDesc, const char *funcName)
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{
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std::stringstream ss;
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ss << "LUA script error";
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ss << "LUA Script ERROR: ";
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if(funcName)
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ss << " in " << funcName << "()";
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ss << ": " << errorDesc << std::endl;
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logError(ss.str().c_str());
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ss << " in " << funcName << "(): ";
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ss << errorDesc << std::endl;
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logError(ss.str());
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}
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void LuaScript::reportErrorWithTraceback(const std::string& errorDesc, const char* funcName)
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{
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pushString(errorDesc);
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luaErrorHandler(L);
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reportError(popString(), funcName);
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}
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int LuaScript::getStackSize()
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@ -126,6 +133,11 @@ int LuaScript::getStackSize()
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return lua_gettop(L);
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}
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void LuaScript::moveTop(int index)
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{
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lua_insert(L, index);
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}
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void LuaScript::pop(int n)
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{
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lua_pop(L, n);
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@ -141,15 +153,15 @@ bool LuaScript::popBoolean()
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int32_t LuaScript::popInteger()
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{
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double d = lua_tonumber(L, -1);
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pop(1);
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pop();
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return (int)d;
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}
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std::string LuaScript::popString()
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{
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size_t len;
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const char *cstr = lua_tolstring(L, -1, &len);
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std::string str(cstr, len);
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std::string str;
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if(lua_isstring(L, -1))
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str = lua_tostring(L, -1);
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pop();
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return str;
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}
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@ -181,8 +193,10 @@ void LuaScript::pushUserdata(void* ptr)
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void LuaScript::pushClassInstance(const ScriptablePtr& object)
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{
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if(object && object->getScriptableName()) {
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if(object) {
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// create weak_ptr to the scriptable object stored as userdata
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new(lua_newuserdata(L, sizeof(ScriptableWeakPtr))) ScriptableWeakPtr(object);
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// set object metatable
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lua_getfield(L, LUA_REGISTRYINDEX, (std::string(object->getScriptableName()) + "_mt").c_str());
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lua_setmetatable(L, -2);
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} else {
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@ -192,18 +206,14 @@ void LuaScript::pushClassInstance(const ScriptablePtr& object)
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ScriptablePtr LuaScript::popClassInstance()
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{
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if(!lua_isuserdata(L, -1)) {
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reportError(format("couldn't pop a class instance, top objet is not a valid type (%s)", luaL_typename(L, -1)));
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lua_pop(L, 1);
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return ScriptablePtr();
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}
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ScriptableWeakPtr *objectRef = (ScriptableWeakPtr *)lua_touserdata(L, -1);
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ScriptablePtr object;
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if(lua_isuserdata(L, -1)) { // instances are store as userdata
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object = ((ScriptableWeakPtr *)lua_touserdata(L, -1))->lock();
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if(!object)
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reportErrorWithTraceback("attempt to retrive class instance from a object that is already expired");
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} else if(!lua_isnil(L, -1)) // we accept nil values
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reportErrorWithTraceback("couldn't retrive class instance, the value is not a scriptable type");
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lua_pop(L, 1);
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ScriptablePtr object = objectRef->lock();
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if(!object)
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reportError(format("attempt to retrive class instance from a object that is already expired"));
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return object;
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}
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@ -240,11 +250,11 @@ void LuaScript::callFunction(int numArgs)
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reportError("stack size changed!");
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}
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void LuaScript::setSelf(const ScriptablePtr& scriptable, int envIndex)
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void LuaScript::setLocal(const ScriptablePtr& scriptable, const char *varName, int envIndex)
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{
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lua_getfenv(L, envIndex);
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pushClassInstance(scriptable);
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lua_setfield(L, -2, "self");
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lua_setfield(L, -2, varName);
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lua_pop(L, 1);
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}
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@ -382,24 +392,36 @@ int LuaScript::luaCompareClassInstances(lua_State* L)
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int LuaScript::luaFunctionCallback(lua_State* L)
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{
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// look for function id
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int id = lua_tonumber(L, lua_upvalueindex(1));
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// call the function
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return (g_lua.*(g_lua.m_functions[id]))();
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}
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int LuaScript::luaErrorHandler(lua_State *L)
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{
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// push debug
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lua_getfield(L, LUA_GLOBALSINDEX, "debug");
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if(!lua_istable(L, -1)) {
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lua_pop(L, 1);
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return 1;
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}
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// push debug.traceback
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lua_getfield(L, -1, "traceback");
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if(!lua_isfunction(L, -1)) {
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lua_pop(L, 2);
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return 1;
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}
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lua_pushvalue(L, 1);
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// remove debug
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lua_remove(L, -2);
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// push additional error message
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lua_pushvalue(L, -2);
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// push level
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lua_pushinteger(L, 2);
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// call debug.traceback
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lua_call(L, 2, 1);
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// remove additional error message
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lua_remove(L, -2);
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// return, the complete error message is on the stack
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return 1;
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}
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Eduardo Bart
13 years ago