minetest/src/script/cpp_api/s_base.cpp

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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "cpp_api/s_base.h"
#include "cpp_api/s_internal.h"
#include "lua_api/l_object.h"
#include "serverobject.h"
#include "debug.h"
#include "log.h"
#include "mods.h"
#include "util/string.h"
extern "C" {
#include "lualib.h"
#if USE_LUAJIT
#include "luajit.h"
#endif
}
#include <stdio.h>
#include <cstdarg>
class ModNameStorer
{
private:
lua_State *L;
public:
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ModNameStorer(lua_State *L_, const std::string &modname):
L(L_)
{
// Store current modname in registry
lua_pushstring(L, modname.c_str());
lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
}
~ModNameStorer()
{
// Clear current modname in registry
lua_pushnil(L);
lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
}
};
/*
ScriptApiBase
*/
ScriptApiBase::ScriptApiBase()
{
#ifdef SCRIPTAPI_LOCK_DEBUG
m_locked = false;
#endif
m_luastack = luaL_newstate();
assert(m_luastack);
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// Add and save an error handler
lua_pushcfunction(m_luastack, script_error_handler);
m_errorhandler = lua_gettop(m_luastack);
// Make the ScriptApiBase* accessible to ModApiBase
lua_pushlightuserdata(m_luastack, this);
lua_setfield(m_luastack, LUA_REGISTRYINDEX, "scriptapi");
// If we are using LuaJIT add a C++ wrapper function to catch
// exceptions thrown in Lua -> C++ calls
#if USE_LUAJIT
lua_pushlightuserdata(m_luastack, (void*) script_exception_wrapper);
luaJIT_setmode(m_luastack, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
lua_pop(m_luastack, 1);
#endif
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m_server = NULL;
m_environment = NULL;
m_guiengine = NULL;
}
ScriptApiBase::~ScriptApiBase()
{
lua_close(m_luastack);
}
bool ScriptApiBase::loadMod(const std::string &scriptpath,
const std::string &modname)
{
ModNameStorer modnamestorer(getStack(), modname);
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if (!string_allowed(modname, MODNAME_ALLOWED_CHARS)) {
errorstream<<"Error loading mod \""<<modname
<<"\": modname does not follow naming conventions: "
<<"Only chararacters [a-z0-9_] are allowed."<<std::endl;
return false;
}
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return loadScript(scriptpath);
}
bool ScriptApiBase::loadScript(const std::string &scriptpath)
{
verbosestream<<"Loading and running script from "<<scriptpath<<std::endl;
lua_State *L = getStack();
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int ret = luaL_loadfile(L, scriptpath.c_str()) || lua_pcall(L, 0, 0, m_errorhandler);
if (ret) {
errorstream << "========== ERROR FROM LUA ===========" << std::endl;
errorstream << "Failed to load and run script from " << std::endl;
errorstream << scriptpath << ":" << std::endl;
errorstream << std::endl;
errorstream << lua_tostring(L, -1) << std::endl;
errorstream << std::endl;
errorstream << "======= END OF ERROR FROM LUA ========" << std::endl;
lua_pop(L, 1); // Pop error message from stack
return false;
}
return true;
}
void ScriptApiBase::realityCheck()
{
int top = lua_gettop(m_luastack);
if(top >= 30){
dstream<<"Stack is over 30:"<<std::endl;
stackDump(dstream);
std::string traceback = script_get_backtrace(m_luastack);
throw LuaError("Stack is over 30 (reality check)\n" + traceback);
}
}
void ScriptApiBase::scriptError()
{
throw LuaError(lua_tostring(m_luastack, -1));
}
void ScriptApiBase::stackDump(std::ostream &o)
{
int i;
int top = lua_gettop(m_luastack);
for (i = 1; i <= top; i++) { /* repeat for each level */
int t = lua_type(m_luastack, i);
switch (t) {
case LUA_TSTRING: /* strings */
o<<"\""<<lua_tostring(m_luastack, i)<<"\"";
break;
case LUA_TBOOLEAN: /* booleans */
o<<(lua_toboolean(m_luastack, i) ? "true" : "false");
break;
case LUA_TNUMBER: /* numbers */ {
char buf[10];
snprintf(buf, 10, "%g", lua_tonumber(m_luastack, i));
o<<buf;
break; }
default: /* other values */
o<<lua_typename(m_luastack, t);
break;
}
o<<" ";
}
o<<std::endl;
}
void ScriptApiBase::addObjectReference(ServerActiveObject *cobj)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
// Create object on stack
ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
int object = lua_gettop(L);
// Get minetest.object_refs table
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "object_refs");
luaL_checktype(L, -1, LUA_TTABLE);
int objectstable = lua_gettop(L);
// object_refs[id] = object
lua_pushnumber(L, cobj->getId()); // Push id
lua_pushvalue(L, object); // Copy object to top of stack
lua_settable(L, objectstable);
}
void ScriptApiBase::removeObjectReference(ServerActiveObject *cobj)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
// Get minetest.object_refs table
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "object_refs");
luaL_checktype(L, -1, LUA_TTABLE);
int objectstable = lua_gettop(L);
// Get object_refs[id]
lua_pushnumber(L, cobj->getId()); // Push id
lua_gettable(L, objectstable);
// Set object reference to NULL
ObjectRef::set_null(L);
lua_pop(L, 1); // pop object
// Set object_refs[id] = nil
lua_pushnumber(L, cobj->getId()); // Push id
lua_pushnil(L);
lua_settable(L, objectstable);
}
// Creates a new anonymous reference if cobj=NULL or id=0
void ScriptApiBase::objectrefGetOrCreate(
ServerActiveObject *cobj)
{
lua_State *L = getStack();
if(cobj == NULL || cobj->getId() == 0){
ObjectRef::create(L, cobj);
} else {
objectrefGet(cobj->getId());
}
}
void ScriptApiBase::objectrefGet(u16 id)
{
lua_State *L = getStack();
// Get minetest.object_refs[i]
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "object_refs");
luaL_checktype(L, -1, LUA_TTABLE);
lua_pushnumber(L, id);
lua_gettable(L, -2);
lua_remove(L, -2); // object_refs
lua_remove(L, -2); // minetest
}