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cuberite-2a/source/LuaState.cpp

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// LuaState.cpp
// Implements the cLuaState class representing the wrapper over lua_State *, provides associated helper functions
#include "Globals.h"
#include "LuaState.h"
extern "C"
{
#include "lualib.h"
}
#include "tolua++.h"
#include "Bindings.h"
#include "ManualBindings.h"
// fwd: SQLite/lsqlite3.c
extern "C"
{
LUALIB_API int luaopen_lsqlite3(lua_State * L);
}
// fwd: LuaExpat/lxplib.c:
extern "C"
{
int luaopen_lxp(lua_State * L);
}
const cLuaState::cRet cLuaState::Return = {};
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cLuaState:
cLuaState::cLuaState(const AString & a_SubsystemName) :
m_LuaState(NULL),
m_IsOwned(false),
m_SubsystemName(a_SubsystemName),
m_NumCurrentFunctionArgs(-1)
{
}
cLuaState::cLuaState(lua_State * a_AttachState) :
m_LuaState(a_AttachState),
m_IsOwned(false),
m_SubsystemName("<attached>"),
m_NumCurrentFunctionArgs(-1)
{
}
cLuaState::~cLuaState()
{
if (IsValid())
{
if (m_IsOwned)
{
Close();
}
else
{
Detach();
}
}
}
void cLuaState::Create(void)
{
if (m_LuaState != NULL)
{
LOGWARNING("%s: Trying to create an already-existing LuaState, ignoring.", __FUNCTION__);
return;
}
m_LuaState = lua_open();
luaL_openlibs(m_LuaState);
tolua_AllToLua_open(m_LuaState);
ManualBindings::Bind(m_LuaState);
luaopen_lsqlite3(m_LuaState);
luaopen_lxp(m_LuaState);
m_IsOwned = true;
}
void cLuaState::Close(void)
{
if (m_LuaState == NULL)
{
LOGWARNING("%s: Trying to close an invalid LuaState, ignoring.", __FUNCTION__);
return;
}
if (!m_IsOwned)
{
LOGWARNING(
"%s: Detected mis-use, calling Close() on an attached state (0x%p). Detaching instead.",
__FUNCTION__, m_LuaState
);
Detach();
return;
}
lua_close(m_LuaState);
m_LuaState = NULL;
m_IsOwned = false;
}
void cLuaState::Attach(lua_State * a_State)
{
if (m_LuaState != NULL)
{
LOGINFO("%s: Already contains a LuaState (0x%p), will be closed / detached.", __FUNCTION__, m_LuaState);
if (m_IsOwned)
{
Close();
}
else
{
Detach();
}
}
m_LuaState = a_State;
m_IsOwned = false;
}
void cLuaState::Detach(void)
{
if (m_LuaState == NULL)
{
return;
}
if (m_IsOwned)
{
LOGWARNING(
"%s: Detected a mis-use, calling Detach() when the state is owned. Closing the owned state (0x%p).",
__FUNCTION__, m_LuaState
);
Close();
return;
}
m_LuaState = NULL;
}
bool cLuaState::LoadFile(const AString & a_FileName)
{
ASSERT(IsValid());
// Load the file:
int s = luaL_loadfile(m_LuaState, a_FileName.c_str());
if (ReportErrors(s))
{
LOGWARNING("Can't load %s because of an error in file %s", m_SubsystemName.c_str(), a_FileName.c_str());
return false;
}
// Execute the globals:
s = lua_pcall(m_LuaState, 0, LUA_MULTRET, 0);
if (ReportErrors(s))
{
LOGWARNING("Error in %s in file %s", m_SubsystemName.c_str(), a_FileName.c_str());
return false;
}
return true;
}
bool cLuaState::HasFunction(const char * a_FunctionName)
{
if (!IsValid())
{
// This happens if cPlugin::Initialize() fails with an error
return false;
}
lua_getglobal(m_LuaState, a_FunctionName);
bool res = (!lua_isnil(m_LuaState, -1) && lua_isfunction(m_LuaState, -1));
lua_pop(m_LuaState, 1);
return res;
}
bool cLuaState::PushFunction(const char * a_FunctionName)
{
ASSERT(m_NumCurrentFunctionArgs == -1); // If not, there's already something pushed onto the stack
if (!IsValid())
{
// This happens if cPlugin::Initialize() fails with an error
return false;
}
lua_getglobal(m_LuaState, a_FunctionName);
if (!lua_isfunction(m_LuaState, -1))
{
LOGWARNING("Error in %s: Could not find function %s()", m_SubsystemName.c_str(), a_FunctionName);
lua_pop(m_LuaState, 1);
return false;
}
m_CurrentFunctionName.assign(a_FunctionName);
m_NumCurrentFunctionArgs = 0;
return true;
}
bool cLuaState::PushFunction(int a_FnRef)
{
ASSERT(IsValid());
ASSERT(m_NumCurrentFunctionArgs == -1); // If not, there's already something pushed onto the stack
lua_rawgeti(m_LuaState, LUA_REGISTRYINDEX, a_FnRef); // same as lua_getref()
if (!lua_isfunction(m_LuaState, -1))
{
lua_pop(m_LuaState, 1);
return false;
}
m_CurrentFunctionName = "<callback>";
m_NumCurrentFunctionArgs = 0;
return true;
}
bool cLuaState::PushFunctionFromRefTable(cRef & a_TableRef, const char * a_FnName)
{
ASSERT(IsValid());
ASSERT(m_NumCurrentFunctionArgs == -1); // If not, there's already something pushed onto the stack
lua_rawgeti(m_LuaState, LUA_REGISTRYINDEX, a_TableRef); // Get the table ref
if (!lua_istable(m_LuaState, -1))
{
// Not a table, bail out
lua_pop(m_LuaState, 1);
return false;
}
lua_getfield(m_LuaState, -1, a_FnName);
if (lua_isnil(m_LuaState, -1) || !lua_isfunction(m_LuaState, -1))
{
// Not a valid function, bail out
lua_pop(m_LuaState, 2);
return false;
}
lua_remove(m_LuaState, -2); // Remove the table ref from the stack
m_CurrentFunctionName = "<table_callback>";
m_NumCurrentFunctionArgs = 0;
return true;
}
void cLuaState::Push(const AString & a_String)
{
ASSERT(IsValid());
tolua_pushcppstring(m_LuaState, a_String);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const AStringVector & a_Vector)
{
ASSERT(IsValid());
lua_createtable(m_LuaState, a_Vector.size(), 0);
int newTable = lua_gettop(m_LuaState);
int index = 1;
for (AStringVector::const_iterator itr = a_Vector.begin(), end = a_Vector.end(); itr != end; ++itr, ++index)
{
tolua_pushstring(m_LuaState, itr->c_str());
lua_rawseti(m_LuaState, newTable, index);
}
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::PushUserType(void * a_Object, const char * a_Type)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Object, a_Type);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(int a_Value)
{
ASSERT(IsValid());
tolua_pushnumber(m_LuaState, a_Value);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(double a_Value)
{
ASSERT(IsValid());
tolua_pushnumber(m_LuaState, a_Value);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const char * a_Value)
{
ASSERT(IsValid());
tolua_pushstring(m_LuaState, a_Value);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(bool a_Value)
{
ASSERT(IsValid());
tolua_pushboolean(m_LuaState, a_Value ? 1 : 0);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cWorld * a_World)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_World, "cWorld");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cPlayer * a_Player)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Player, "cPlayer");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const cPlayer * a_Player)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, (void *)a_Player, "cPlayer");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cEntity * a_Entity)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Entity, "cEntity");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cMonster * a_Monster)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Monster, "cMonster");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cItem * a_Item)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Item, "cItem");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cItems * a_Items)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Items, "cItems");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cClientHandle * a_Client)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Client, "cClientHandle");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cPickup * a_Pickup)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Pickup, "cPickup");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cChunkDesc * a_ChunkDesc)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_ChunkDesc, "cChunkDesc");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const cCraftingGrid * a_Grid)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, (void *)a_Grid, "cCraftingGrid");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const cCraftingRecipe * a_Recipe)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, (void *)a_Recipe, "cCraftingRecipe");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(TakeDamageInfo * a_TDI)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_TDI, "TakeDamageInfo");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cWindow * a_Window)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Window, "cWindow");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cPluginLua * a_Plugin)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Plugin, "cPluginLua");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const HTTPRequest * a_Request)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, (void *)a_Request, "HTTPRequest");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cWebAdmin * a_WebAdmin)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_WebAdmin, "cWebAdmin");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(const HTTPTemplateRequest * a_Request)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, (void *)a_Request, "HTTPTemplateRequest");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cTNTEntity * a_TNTEntity)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_TNTEntity, "cTNTEntity");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cCreeper * a_Creeper)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Creeper, "cCreeper");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(Vector3i * a_Vector)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Vector, "Vector3i");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(void * a_Ptr)
{
ASSERT(IsValid());
lua_pushnil(m_LuaState);
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cHopperEntity * a_Hopper)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_Hopper, "cHopperEntity");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::Push(cBlockEntity * a_BlockEntity)
{
ASSERT(IsValid());
tolua_pushusertype(m_LuaState, a_BlockEntity, "cBlockEntity");
m_NumCurrentFunctionArgs += 1;
}
void cLuaState::GetReturn(int a_StackPos, bool & a_ReturnedVal)
{
a_ReturnedVal = (tolua_toboolean(m_LuaState, a_StackPos, a_ReturnedVal ? 1 : 0) > 0);
}
void cLuaState::GetReturn(int a_StackPos, AString & a_ReturnedVal)
{
if (lua_isstring(m_LuaState, a_StackPos))
{
a_ReturnedVal = tolua_tocppstring(m_LuaState, a_StackPos, a_ReturnedVal.c_str());
}
}
void cLuaState::GetReturn(int a_StackPos, int & a_ReturnedVal)
{
if (lua_isnumber(m_LuaState, a_StackPos))
{
a_ReturnedVal = (int)tolua_tonumber(m_LuaState, a_StackPos, a_ReturnedVal);
}
}
void cLuaState::GetReturn(int a_StackPos, double & a_ReturnedVal)
{
if (lua_isnumber(m_LuaState, a_StackPos))
{
a_ReturnedVal = tolua_tonumber(m_LuaState, a_StackPos, a_ReturnedVal);
}
}
bool cLuaState::CallFunction(int a_NumResults)
{
ASSERT (m_NumCurrentFunctionArgs >= 0); // A function must be pushed to stack first
ASSERT(lua_isfunction(m_LuaState, -m_NumCurrentFunctionArgs - 1));
int s = lua_pcall(m_LuaState, m_NumCurrentFunctionArgs, a_NumResults, 0);
if (ReportErrors(s))
{
LOGWARNING("Error in %s calling function %s()", m_SubsystemName.c_str(), m_CurrentFunctionName.c_str());
m_NumCurrentFunctionArgs = -1;
m_CurrentFunctionName.clear();
return false;
}
m_NumCurrentFunctionArgs = -1;
m_CurrentFunctionName.clear();
return true;
}
bool cLuaState::CheckParamUserType(int a_StartParam, const char * a_UserType, int a_EndParam)
{
ASSERT(IsValid());
if (a_EndParam < 0)
{
a_EndParam = a_StartParam;
}
tolua_Error tolua_err;
for (int i = a_StartParam; i <= a_EndParam; i++)
{
if (tolua_isusertype(m_LuaState, i, a_UserType, 0, &tolua_err))
{
continue;
}
// Not the correct parameter
lua_Debug entry;
VERIFY(lua_getstack(m_LuaState, 0, &entry));
VERIFY(lua_getinfo (m_LuaState, "n", &entry));
AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
return false;
} // for i - Param
// All params checked ok
return true;
}
bool cLuaState::CheckParamTable(int a_StartParam, int a_EndParam)
{
ASSERT(IsValid());
if (a_EndParam < 0)
{
a_EndParam = a_StartParam;
}
tolua_Error tolua_err;
for (int i = a_StartParam; i <= a_EndParam; i++)
{
if (tolua_istable(m_LuaState, i, 0, &tolua_err))
{
continue;
}
// Not the correct parameter
lua_Debug entry;
VERIFY(lua_getstack(m_LuaState, 0, &entry));
VERIFY(lua_getinfo (m_LuaState, "n", &entry));
AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
return false;
} // for i - Param
// All params checked ok
return true;
}
bool cLuaState::CheckParamNumber(int a_StartParam, int a_EndParam)
{
ASSERT(IsValid());
if (a_EndParam < 0)
{
a_EndParam = a_StartParam;
}
tolua_Error tolua_err;
for (int i = a_StartParam; i <= a_EndParam; i++)
{
if (tolua_isnumber(m_LuaState, i, 0, &tolua_err))
{
continue;
}
// Not the correct parameter
lua_Debug entry;
VERIFY(lua_getstack(m_LuaState, 0, &entry));
VERIFY(lua_getinfo (m_LuaState, "n", &entry));
AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != NULL) ? entry.name : "?");
tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
return false;
} // for i - Param
// All params checked ok
return true;
}
bool cLuaState::CheckParamEnd(int a_Param)
{
tolua_Error tolua_err;
if (tolua_isnoobj(m_LuaState, a_Param, &tolua_err))
{
return true;
}
// Not the correct parameter
lua_Debug entry;
VERIFY(lua_getstack(m_LuaState, 0, &entry));
VERIFY(lua_getinfo (m_LuaState, "n", &entry));
AString ErrMsg = Printf("#ferror in function '%s': Too many arguments.", (entry.name != NULL) ? entry.name : "?");
tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
return false;
}
bool cLuaState::ReportErrors(int a_Status)
{
return ReportErrors(m_LuaState, a_Status);
}
bool cLuaState::ReportErrors(lua_State * a_LuaState, int a_Status)
{
if (a_Status == 0)
{
// No error to report
return false;
}
LOGWARNING("LUA: %d - %s", a_Status, lua_tostring(a_LuaState, -1));
lua_pop(a_LuaState, 1);
return true;
}
void cLuaState::LogStackTrace(void)
{
LOGWARNING("Stack trace:");
lua_Debug entry;
int depth = 0;
while (lua_getstack(m_LuaState, depth, &entry))
{
int status = lua_getinfo(m_LuaState, "Sln", &entry);
assert(status);
LOGWARNING(" %s(%d): %s", entry.short_src, entry.currentline, entry.name ? entry.name : "?");
depth++;
}
LOGWARNING("Stack trace end");
}
AString cLuaState::GetTypeText(int a_StackPos)
{
int Type = lua_type(m_LuaState, a_StackPos);
switch (Type)
{
case LUA_TNONE: return "TNONE";
case LUA_TNIL: return "TNIL";
case LUA_TBOOLEAN: return "TBOOLEAN";
case LUA_TLIGHTUSERDATA: return "TLIGHTUSERDATA";
case LUA_TNUMBER: return "TNUMBER";
case LUA_TSTRING: return "TSTRING";
case LUA_TTABLE: return "TTABLE";
case LUA_TFUNCTION: return "TFUNCTION";
case LUA_TUSERDATA: return "TUSERDATA";
case LUA_TTHREAD: return "TTHREAD";
}
return Printf("Unknown (%d)", Type);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cLuaState::cRef:
cLuaState::cRef::cRef(cLuaState & a_LuaState, int a_StackPos) :
m_LuaState(a_LuaState)
{
ASSERT(m_LuaState.IsValid());
lua_pushvalue(m_LuaState, a_StackPos); // Push a copy of the value at a_StackPos onto the stack
m_Ref = luaL_ref(m_LuaState, LUA_REGISTRYINDEX);
}
cLuaState::cRef::~cRef()
{
ASSERT(m_LuaState.IsValid());
if (IsValid())
{
luaL_unref(m_LuaState, LUA_REGISTRYINDEX, m_Ref);
}
}
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