src/library/lua.cpp

   1 #include "lua-base.hpp"
   2 #include "lua-class.hpp"
   3 #include "lua-function.hpp"
   4 #include "lua-params.hpp"
   5 #include "lua-pin.hpp"
   6 #include "stateobject.hpp"
   7 #include "threads.hpp"
   8 #include <iostream>
   9 #include <cassert>
  10
  11 namespace lua
  12 {
  13 namespace
  14 {
  15         threads::rlock* global_lock;
  16         threads::rlock& get_lua_lock()
  17         {
  18                 if(!global_lock) global_lock = new threads::rlock;
  19                 return *global_lock;
  20         }
  21
  22         struct state_internal
  23         {
  24                 std::map<std::string, state::callback_list*> callbacks;
  25                 std::set<std::pair<function_group*, int>> function_groups;
  26                 std::set<std::pair<class_group*, int>> class_groups;
  27         };
  28
  29         struct fgroup_internal
  30         {
  31                 fgroup_internal()
  32                 {
  33                         next_handle = 0;
  34                 }
  35                 std::map<std::string, function*> functions;
  36                 int next_handle;
  37                 std::map<int, std::function<void(std::string, function*)>> callbacks;
  38                 std::map<int, std::function<void(function_group*)>> dcallbacks;
  39         };
  40
  41         struct cgroup_internal
  42         {
  43                 cgroup_internal()
  44                 {
  45                         next_handle = 0;
  46                 }
  47                 int next_handle;
  48                 std::map<std::string, class_base*> classes;
  49                 std::map<int, std::function<void(std::string, class_base*)>> callbacks;
  50                 std::map<int, std::function<void(class_group*)>> dcallbacks;
  51         };
  52
  53         typedef stateobject::type<state, state_internal> state_internal_t;
  54         typedef stateobject::type<function_group, fgroup_internal> fgroup_internal_t;
  55         typedef stateobject::type<class_group, cgroup_internal> cgroup_internal_t;
  56 }
  57
  58 std::unordered_map<std::type_index, void*>& class_types()
  59 {
  60         static std::unordered_map<std::type_index, void*> x;
  61         return x;
  62 }
  63 namespace
  64 {
  65         char classtable_key;
  66         char classtable_meta_key;
  67
  68         struct class_info
  69         {
  70                 class_base* obj;
  71                 static int index(state& L);
  72                 static int newindex(state& L);
  73                 static int pairs(state& L);
  74                 static int pairs_next(state& L);
  75                 static int smethods(state& L);
  76                 static int cmethods(state& L);
  77                 static int trampoline(state& L);
  78                 static void check(state& L);
  79         };
  80
  81         void class_info::check(state& L)
  82         {
  83                 L.pushlightuserdata(&classtable_meta_key);
  84                 L.rawget(LUA_REGISTRYINDEX);
  85                 L.getmetatable(1);
  86                 if(!L.rawequal(-1, -2))
  87                         throw std::runtime_error("Bad class table");
  88                 L.pop(2);
  89         }
  90
  91         int class_info::index(state& L)
  92         {
  93                 check(L);
  94
  95                 class_base* ptr = ((class_info*)L.touserdata(1))->obj;
  96                 const char* method = L.tostring(2);
  97                 if(!method)
  98                         throw std::runtime_error("Indexing invalid element of class table");
  99                 if(!strcmp(method, "_static_methods")) {
 100                         L.pushlightuserdata(ptr);
 101                         L.push_trampoline(class_info::smethods, 1);
 102                         return 1;
 103                 } else if(!strcmp(method, "_class_methods")) {
 104                         L.pushlightuserdata(ptr);
 105                         L.push_trampoline(class_info::cmethods, 1);
 106                         return 1;
 107                 } else {
 108                         auto m = ptr->static_methods();
 109                         for(auto i : m) {
 110                                 if(!strcmp(i.name, method)) {
 111                                         //Hit.
 112                                         std::string fname = ptr->get_name() + "::" + i.name;
 113                                         L.pushlightuserdata((void*)i.fn);
 114                                         L.pushstring(fname.c_str());
 115                                         L.push_trampoline(class_info::trampoline, 2);
 116                                         return 1;
 117                                 }
 118                         }
 119                         std::string err = std::string("Class '") + ptr->get_name() +
 120                                 "' does not have static method '" + method + "'";
 121                         throw std::runtime_error(err);
 122                 }
 123                 return 0; //NOTREACHED
 124         }
 125         int class_info::newindex(state& L)
 126         {
 127                 throw std::runtime_error("Writing into class table not allowed");
 128         }
 129
 130         int class_info::pairs(state& L)
 131         {
 132                 check(L);
 133
 134                 L.push_trampoline(class_info::pairs_next, 0);   //Next.
 135                 L.pushvalue(1);                                 //State.
 136                 L.pushnil();                                    //Index.
 137                 return 3;
 138         }
 139
 140         int class_info::pairs_next(state& L)
 141         {
 142                 check(L);
 143
 144                 class_base* obj = ((class_info*)L.touserdata(1))->obj;
 145                 auto m = obj->static_methods();
 146                 std::string key = (L.type(2) == LUA_TSTRING) ? L.tostring(2) : "";
 147                 std::string lowbound = "\xFF";  //Sorts greater than anything that is valid UTF-8.
 148                 void* best_fn = NULL;
 149                 for(auto i : m)
 150                         if(lowbound > i.name && i.name > key) {
 151                                 lowbound = i.name;
 152                                 best_fn = (void*)i.fn;
 153                         }
 154                 if(best_fn) {
 155                         L.pushlstring(lowbound);
 156                         std::string name = obj->get_name() + "::" + lowbound;
 157                         L.pushlightuserdata(best_fn);
 158                         L.pushlstring(name);
 159                         L.push_trampoline(class_info::trampoline, 2);
 160                         return 2;
 161                 } else {
 162                         L.pushnil();
 163                         return 1;
 164                 }
 165         }
 166
 167         int class_info::smethods(state& L)
 168         {
 169                 class_base* obj = (class_base*)L.touserdata(L.trampoline_upval(1));
 170                 auto m = obj->static_methods();
 171                 int rets = 0;
 172                 for(auto i : m) {
 173                         L.pushstring(i.name);
 174                         rets++;
 175                 }
 176                 return rets;
 177         }
 178
 179         int class_info::cmethods(state& L)
 180         {
 181                 class_base* obj = (class_base*)L.touserdata(L.trampoline_upval(1));
 182                 auto m = obj->class_methods();
 183                 int rets = 0;
 184                 for(auto i : m) {
 185                         L.pushstring(i.c_str());
 186                         rets++;
 187                 }
 188                 return rets;
 189         }
 190
 191         typedef int (*fn_t)(state& L, parameters& P);
 192         typedef int (*fnraw_t)(state& L);
 193
 194         //2 upvalues:
 195         //1) Pointer to function control block.
 196         //2) Pointer to method name.
 197         int class_info::trampoline(state& L)
 198         {
 199                 void* _fn = L.touserdata(L.trampoline_upval(1));
 200                 fn_t fn = (fn_t)_fn;
 201                 std::string name = L.tostring(L.trampoline_upval(2));
 202                 parameters P(L, name);
 203                 return fn(L, P);
 204         }
 205
 206         //1 upvalue:
 207         //1) Pointer to function control block.
 208         int lua_trampoline_function(state& L)
 209         {
 210                 void* ptr = L.touserdata(L.trampoline_upval(1));
 211                 function* f = reinterpret_cast<function*>(ptr);
 212                 return f->invoke(L);
 213         }
 214
 215         //2 upvalues.
 216         //1) Pointer to master state.
 217         //2) Poiinter to function to call.
 218         int lua_main_trampoline(lua_State* L)
 219         {
 220                 state* lstate = reinterpret_cast<state*>(lua_touserdata(L, lua_upvalueindex(1)));
 221                 void* _fn = lua_touserdata(L, lua_upvalueindex(2));
 222                 fnraw_t fn = (fnraw_t)_fn;
 223                 //The function is always run in non-set_interruptable mode.
 224                 try {
 225                         state _L(*lstate, L);
 226                         lstate->set_interruptable_flag(false);
 227                         int r = fn(_L);
 228                         lstate->set_interruptable_flag(true);
 229                         return r;
 230                 } catch(std::exception& e) {
 231                         lua_pushfstring(L, "%s", e.what());
 232                         lstate->set_interruptable_flag(true);
 233                         lua_error(L);
 234                 }
 235                 return 0;
 236         }
 237
 238         //Pushes given table to top of stack, creating if needed.
 239         void recursive_lookup_table(state& L, const std::string& tab)
 240         {
 241                 if(tab == "") {
 242                         L.pushglobals();
 243                         assert(L.type(-1) == LUA_TTABLE);
 244                         return;
 245                 }
 246                 std::string u = tab;
 247                 size_t split = u.find_last_of(".");
 248                 std::string u1;
 249                 std::string u2 = u;
 250                 if(split < u.length()) {
 251                         u1 = u.substr(0, split);
 252                         u2 = u.substr(split + 1);
 253                 }
 254                 recursive_lookup_table(L, u1);
 255                 L.getfield(-1, u2.c_str());
 256                 if(L.type(-1) != LUA_TTABLE) {
 257                         //Not a table, create a table.
 258                         L.pop(1);
 259                         L.newtable();
 260                         L.setfield(-2, u2.c_str());
 261                         L.getfield(-1, u2.c_str());
 262                 }
 263                 //Get rid of previous table.
 264                 L.insert(-2);
 265                 L.pop(1);
 266         }
 267
 268         void register_function(state& L, const std::string& name, function* fun)
 269         {
 270                 std::string u = name;
 271                 size_t split = u.find_last_of(".");
 272                 std::string u1;
 273                 std::string u2 = u;
 274                 if(split < u.length()) {
 275                         u1 = u.substr(0, split);
 276                         u2 = u.substr(split + 1);
 277                 }
 278                 recursive_lookup_table(L, u1);
 279                 if(!fun)
 280                         L.pushnil();
 281                 else {
 282                         void* ptr = reinterpret_cast<void*>(fun);
 283                         L.pushlightuserdata(ptr);
 284                         L.push_trampoline(lua_trampoline_function, 1);
 285                 }
 286                 L.setfield(-2, u2.c_str());
 287                 L.pop(1);
 288         }
 289
 290         void register_class(state& L, const std::string& name, class_base* fun)
 291         {
 292                 fun->register_state(L);
 293         }
 294
 295         int run_interruptable_trampoline(lua_State* L)
 296         {
 297                 //Be very careful with faults here! We are running in interruptable context.
 298                 static std::string err;
 299                 auto& fn = *(std::function<void()>*)lua_touserdata(L, -1);
 300                 int out = lua_tonumber(L, -2);
 301                 lua_pop(L, 2);  //fn is passed as a pointer, so popping it is OK.
 302                 try {
 303                         fn();
 304                 } catch(std::exception& e) {
 305                         err = e.what();
 306                         //This can fault, so err is static.
 307                         lua_pushlstring(L, err.c_str(), err.length());
 308                         lua_error(L);
 309                 }
 310                 return out;
 311         }
 312 }
 313
 314 state::state() throw(std::bad_alloc)
 315 {
 316         master = NULL;
 317         lua_handle = NULL;
 318         oom_handler = builtin_oom;
 319         soft_oom_handler = builtin_soft_oom;
 320         interruptable = false;          //Assume initially not interruptable.
 321         memory_limit = (size_t)-1;      //Unlimited.
 322         memory_use = 0;
 323 }
 324
 325 state::state(state& _master, lua_State* L)
 326 {
 327         master = &_master;
 328         lua_handle = L;
 329 }
 330
 331 state::~state() throw()
 332 {
 333         if(master)
 334                 return;
 335         threads::arlock h(get_lua_lock());
 336         auto state = state_internal_t::get_soft(this);
 337         if(!state) return;
 338         for(auto i : state->function_groups)
 339                 i.first->drop_callback(i.second);
 340         for(auto i : state->class_groups)
 341                 i.first->drop_callback(i.second);
 342         if(lua_handle)
 343                 lua_close(lua_handle);
 344         state_internal_t::clear(this);
 345 }
 346
 347 void state::builtin_oom()
 348 {
 349         std::cerr << "PANIC: FATAL: Out of memory" << std::endl;
 350         exit(1);
 351 }
 352
 353 void state::builtin_soft_oom(int status)
 354 {
 355         if(status == 0)
 356                 std::cerr << "Lua: Memory limit exceeded, attempting to free memory..." << std::endl;
 357         if(status < 0)
 358                 std::cerr << "Lua: Memory allocation still failed." << std::endl;
 359         if(status > 0)
 360                 std::cerr << "Lua: Allocation successful after freeing some memory." << std::endl;
 361 }
 362
 363 void* state::builtin_alloc(void* user, void* old, size_t olds, size_t news)
 364 {
 365         void* m;
 366         auto& st = *reinterpret_cast<state*>(user);
 367         if(news) {
 368                 if(news > olds && !st.charge_memory(news - olds, false)) {
 369                         goto retry_allocation;
 370                 }
 371                 m = realloc(old, news);
 372                 if(!m && !st.get_interruptable_flag())
 373                         st.oom_handler();
 374                 if(!m) {
 375                         st.charge_memory(news - olds, true);    //Undo commit.
 376                         goto retry_allocation;
 377                 }
 378                 if(news < olds)
 379                         st.charge_memory(olds - news, true);    //Release memory.
 380                 if(m && st.memory_change) st.memory_change((ssize_t)news - (ssize_t)olds);
 381                 return m;
 382         } else {
 383                 st.charge_memory(olds, true);   //Release memory.
 384                 if(st.memory_change) st.memory_change(-(ssize_t)olds);
 385                 free(old);
 386         }
 387         return NULL;
 388 retry_allocation:
 389         st.soft_oom_handler(0);
 390         st.interruptable = false;                       //Give everything we got for the GC.
 391         lua_gc(st.lua_handle, LUA_GCCOLLECT,0);         //Do full cycle to try to free some memory.
 392         st.interruptable = true;
 393         if(!st.charge_memory(news - olds, false)) {     //Try to see if memory can be allocated.
 394                 st.soft_oom_handler(-1);
 395                 return NULL;
 396         }
 397         m = realloc(old, news);
 398         if(!m && news > olds)
 399                 st.charge_memory(news - olds, true);    //Undo commit.
 400         st.soft_oom_handler(m ? 1 : -1);
 401         if(m && st.memory_change) st.memory_change((ssize_t)news - (ssize_t)olds);
 402         return m;
 403 }
 404
 405 void state::push_trampoline(int(*fn)(state& L), unsigned n_upvals)
 406 {
 407         lua_pushlightuserdata(lua_handle, (void*)&get_master());
 408         lua_pushlightuserdata(lua_handle, (void*)fn);
 409         if(n_upvals > 0) {
 410                 lua_insert(lua_handle, -(int)n_upvals - 2);
 411                 lua_insert(lua_handle, -(int)n_upvals - 2);
 412         }
 413         lua_pushcclosure(lua_handle, lua_main_trampoline, trampoline_upvals + n_upvals);
 414 }
 415
 416 void state::run_interruptable(std::function<void()> fn, unsigned in, unsigned out)
 417 {
 418         pushnumber(out);
 419         pushlightuserdata(&fn);
 420         pushcfunction(run_interruptable_trampoline);
 421         insert(-(int)in - 3);
 422         int r = pcall(in + 2, out, 0);
 423         if(r == LUA_OK) {
 424                 //Nothing.
 425         } else if(r == LUA_ERRRUN) {
 426                 throw std::runtime_error(tostring(-1));
 427         } else if(r == LUA_ERRMEM) {
 428                 throw std::runtime_error("Lua out of memory");
 429         } else if(r == LUA_ERRERR) {
 430                 throw std::runtime_error("Lua double fault");
 431 #ifdef LUA_ERRGCMM
 432         } else if(r == LUA_ERRGCMM) {
 433                 throw std::runtime_error("Lua fault in garbage collector");
 434 #endif
 435         }
 436 }
 437
 438 bool state::charge_memory(size_t amount, bool release)
 439 {
 440         if(master) return master->charge_memory(amount, release);
 441         if(release) {
 442                 if(memory_use > amount)
 443                         memory_use -= amount;
 444                 else
 445                         memory_use = 0;
 446                 return true;
 447         }
 448         if(!interruptable) {
 449                 //Give everything we got.
 450                 memory_use += amount;
 451                 return true;
 452         } else {
 453                 //Check limit and refuse allocations too large.
 454                 if(memory_use + amount > memory_limit || memory_use + amount < amount)
 455                         return false;
 456                 memory_use += amount;
 457                 return true;
 458         }
 459 }
 460
 461 function::function(function_group& _group, const std::string& func) throw(std::bad_alloc)
 462         : group(_group)
 463 {
 464         group.do_register(fname = func, *this);
 465 }
 466
 467 function::~function() throw()
 468 {
 469         group.do_unregister(fname, *this);
 470 }
 471
 472 class_base::class_base(class_group& _group, const std::string& _name)
 473         : group(_group), name(_name)
 474 {
 475         registered = false;
 476 }
 477
 478 class_base::~class_base() throw()
 479 {
 480         if(registered)
 481                 group.do_unregister(name, *this);
 482 }
 483
 484 void state::reset() throw(std::bad_alloc, std::runtime_error)
 485 {
 486         if(master)
 487                 return master->reset();
 488         threads::arlock h(get_lua_lock());
 489         auto state = &state_internal_t::get(this);
 490         if(lua_handle) {
 491                 lua_State* tmp = lua_newstate(state::builtin_alloc, this);
 492                 if(!tmp)
 493                         throw std::runtime_error("Can't re-initialize Lua interpretter");
 494                 lua_close(lua_handle);
 495                 for(auto& i : state->callbacks)
 496                         i.second->clear();
 497                 lua_handle = tmp;
 498         } else {
 499                 //Initialize new.
 500                 lua_handle = lua_newstate(state::builtin_alloc, this);
 501                 if(!lua_handle)
 502                         throw std::runtime_error("Can't initialize Lua interpretter");
 503         }
 504         for(auto i : state->function_groups)
 505                 i.first->request_callback([this](std::string name, function* func) -> void {
 506                         register_function(*this, name, func);
 507                 });
 508         for(auto i : state->class_groups)
 509                 i.first->request_callback([this](std::string name, class_base* clazz) -> void {
 510                         register_class(*this, name, clazz);
 511                 });
 512 }
 513
 514 void state::deinit() throw()
 515 {
 516         if(master)
 517                 return master->deinit();
 518         if(lua_handle)
 519                 lua_close(lua_handle);
 520         lua_handle = NULL;
 521 }
 522
 523 void state::add_function_group(function_group& group)
 524 {
 525         threads::arlock h(get_lua_lock());
 526         auto& state = state_internal_t::get(this);
 527         state.function_groups.insert(std::make_pair(&group, group.add_callback([this](const std::string& name,
 528                 function* func) -> void {
 529                 this->function_callback(name, func);
 530         }, [this](function_group* x) {
 531                 threads::arlock h(get_lua_lock());
 532                 auto state = state_internal_t::get_soft(this);
 533                 if(!state) return;
 534                 for(auto i = state->function_groups.begin(); i != state->function_groups.end();)
 535                         if(i->first == x)
 536                                 i = state->function_groups.erase(i);
 537                         else
 538                                 i++;
 539         })));
 540 }
 541
 542 void state::add_class_group(class_group& group)
 543 {
 544         threads::arlock h(get_lua_lock());
 545         auto& state = state_internal_t::get(this);
 546         state.class_groups.insert(std::make_pair(&group, group.add_callback([this](const std::string& name,
 547                 class_base* clazz) -> void {
 548                 this->class_callback(name, clazz);
 549         }, [this](class_group* x) {
 550                 threads::arlock h(get_lua_lock());
 551                 auto state = state_internal_t::get_soft(this);
 552                 if(!state) return;
 553                 for(auto i = state->class_groups.begin(); i != state->class_groups.end();)
 554                         if(i->first == x)
 555                                 i = state->class_groups.erase(i);
 556                         else
 557                                 i++;
 558         })));
 559 }
 560
 561 void state::function_callback(const std::string& name, function* func)
 562 {
 563         if(master)
 564                 return master->function_callback(name, func);
 565         if(lua_handle)
 566                 register_function(*this, name, func);
 567 }
 568
 569 void state::class_callback(const std::string& name, class_base* clazz)
 570 {
 571         if(master)
 572                 return master->class_callback(name, clazz);
 573         if(lua_handle)
 574                 register_class(*this, name, clazz);
 575 }
 576
 577 bool state::do_once(void* key)
 578 {
 579         if(master)
 580                 return master->do_once(key);
 581         pushlightuserdata(key);
 582         rawget(LUA_REGISTRYINDEX);
 583         if(type(-1) == LUA_TNIL) {
 584                 pop(1);
 585                 pushlightuserdata(key);
 586                 pushlightuserdata(key);
 587                 rawset(LUA_REGISTRYINDEX);
 588                 return true;
 589         } else {
 590                 pop(1);
 591                 return false;
 592         }
 593 }
 594
 595 std::list<state::callback_list*> state::get_callbacks()
 596 {
 597         if(master)
 598                 return master->get_callbacks();
 599         threads::arlock h(get_lua_lock());
 600         auto state = state_internal_t::get_soft(this);
 601         std::list<callback_list*> r;
 602         if(state)
 603                 for(auto i : state->callbacks)
 604                         r.push_back(i.second);
 605         return r;
 606 }
 607
 608 void state::do_register(const std::string& name, callback_list& callback)
 609 {
 610         threads::arlock h(get_lua_lock());
 611         auto& state = state_internal_t::get(this);
 612         if(state.callbacks.count(name)) return;
 613         state.callbacks[name] = &callback;
 614 }
 615
 616 void state::do_unregister(const std::string& name, callback_list& callback)
 617 {
 618         threads::arlock h(get_lua_lock());
 619         auto state = state_internal_t::get_soft(this);
 620         if(state && state->callbacks.count(name) && state->callbacks[name] == &callback)
 621                 state->callbacks.erase(name);
 622 }
 623
 624 state::callback_list::callback_list(state& _L, const std::string& _name, const std::string& fncbname)
 625         : L(_L), name(_name), fn_cbname(fncbname)
 626 {
 627         L.do_register(name, *this);
 628 }
 629
 630 state::callback_list::~callback_list()
 631 {
 632         L.do_unregister(name, *this);
 633         if(!L.handle())
 634                 return;
 635         for(auto& i : callbacks) {
 636                 L.pushlightuserdata(&i);
 637                 L.pushnil();
 638                 L.rawset(LUA_REGISTRYINDEX);
 639         }
 640 }
 641
 642 void state::callback_list::_register(state& _L)
 643 {
 644         callbacks.push_back(0);
 645         _L.pushlightuserdata(&*callbacks.rbegin());
 646         _L.pushvalue(-2);
 647         _L.rawset(LUA_REGISTRYINDEX);
 648 }
 649
 650 void state::callback_list::_unregister(state& _L)
 651 {
 652         for(auto i = callbacks.begin(); i != callbacks.end();) {
 653                 _L.pushlightuserdata(&*i);
 654                 _L.rawget(LUA_REGISTRYINDEX);
 655                 if(_L.rawequal(-1, -2)) {
 656                         char* key = &*i;
 657                         _L.pushlightuserdata(key);
 658                         _L.pushnil();
 659                         _L.rawset(LUA_REGISTRYINDEX);
 660                         i = callbacks.erase(i);
 661                 } else
 662                         i++;
 663                 _L.pop(1);
 664         }
 665 }
 666
 667 function_group::function_group()
 668 {
 669 }
 670
 671 function_group::~function_group()
 672 {
 673         threads::arlock h(get_lua_lock());
 674         auto state = fgroup_internal_t::get_soft(this);
 675         if(!state) return;
 676         for(auto i : state->dcallbacks)
 677                 i.second(this);
 678         fgroup_internal_t::clear(this);
 679 }
 680
 681 void function_group::request_callback(std::function<void(std::string, function*)> cb)
 682 {
 683         threads::arlock h(get_lua_lock());
 684         auto state = fgroup_internal_t::get_soft(this);
 685         if(!state) return;
 686         for(auto i : state->functions)
 687                 cb(i.first, i.second);
 688 }
 689
 690 int function_group::add_callback(std::function<void(std::string, function*)> cb,
 691         std::function<void(function_group*)> dcb)
 692 {
 693         threads::arlock h(get_lua_lock());
 694         auto& state = fgroup_internal_t::get(this);
 695         int handle = state.next_handle++;
 696         state.callbacks[handle] = cb;
 697         state.dcallbacks[handle] = dcb;
 698         for(auto i : state.functions)
 699                 cb(i.first, i.second);
 700         return handle;
 701 }
 702
 703 void function_group::drop_callback(int handle)
 704 {
 705         threads::arlock h(get_lua_lock());
 706         auto state = fgroup_internal_t::get_soft(this);
 707         if(!state) return;
 708         state->callbacks.erase(handle);
 709 }
 710
 711 void function_group::do_register(const std::string& name, function& fun)
 712 {
 713         threads::arlock h(get_lua_lock());
 714         auto& state = fgroup_internal_t::get(this);
 715         if(state.functions.count(name)) return;
 716         state.functions[name] = &fun;
 717         for(auto i : state.callbacks)
 718                 i.second(name, &fun);
 719 }
 720
 721 void function_group::do_unregister(const std::string& name, function& fun)
 722 {
 723         threads::arlock h(get_lua_lock());
 724         auto state = fgroup_internal_t::get_soft(this);
 725         if(!state || !state->functions.count(name) || state->functions[name] != &fun) return;
 726         state->functions.erase(name);
 727         for(auto i : state->callbacks)
 728                 i.second(name, NULL);
 729 }
 730
 731 class_group::class_group()
 732 {
 733 }
 734
 735 class_group::~class_group()
 736 {
 737         threads::arlock h(get_lua_lock());
 738         auto state = cgroup_internal_t::get_soft(this);
 739         if(!state) return;
 740         for(auto i : state->dcallbacks)
 741                 i.second(this);
 742         cgroup_internal_t::clear(this);
 743 }
 744
 745 void class_group::request_callback(std::function<void(std::string, class_base*)> cb)
 746 {
 747         threads::arlock h(get_lua_lock());
 748         auto state = cgroup_internal_t::get_soft(this);
 749         if(!state) return;
 750         for(auto i : state->classes)
 751                 cb(i.first, i.second);
 752 }
 753
 754 int class_group::add_callback(std::function<void(std::string, class_base*)> cb,
 755         std::function<void(class_group*)> dcb)
 756 {
 757         threads::arlock h(get_lua_lock());
 758         auto& state = cgroup_internal_t::get(this);
 759         int handle = state.next_handle++;
 760         state.callbacks[handle] = cb;
 761         state.dcallbacks[handle] = dcb;
 762         for(auto i : state.classes)
 763                 cb(i.first, i.second);
 764         return handle;
 765 }
 766
 767 void class_group::drop_callback(int handle)
 768 {
 769         threads::arlock h(get_lua_lock());
 770         auto state = cgroup_internal_t::get_soft(this);
 771         if(!state) return;
 772         state->callbacks.erase(handle);
 773 }
 774
 775 void class_group::do_register(const std::string& name, class_base& fun)
 776 {
 777         threads::arlock h(get_lua_lock());
 778         auto& state = cgroup_internal_t::get(this);
 779         if(state.classes.count(name)) return;
 780         state.classes[name] = &fun;
 781         for(auto i : state.callbacks)
 782                 i.second(name, &fun);
 783 }
 784
 785 void class_group::do_unregister(const std::string& name, class_base& fun)
 786 {
 787         threads::arlock h(get_lua_lock());
 788         auto state = cgroup_internal_t::get_soft(this);
 789         if(!state || !state->classes.count(name) || state->classes[name] != &fun) return;
 790         state->classes.erase(name);
 791         for(auto i : state->callbacks)
 792                 i.second(name, NULL);
 793 }
 794
 795 std::list<class_ops>& userdata_recogn_fns()
 796 {
 797         static std::list<class_ops> x;
 798         return x;
 799 }
 800
 801 std::string try_recognize_userdata(state& state, int index)
 802 {
 803         for(auto i : userdata_recogn_fns())
 804                 if(i.is(state, index))
 805                         return i.name();
 806         //Hack: Lua builtin file objects and classobjs.
 807         if(state.getmetatable(index)) {
 808                 state.pushstring("FILE*");
 809                 state.rawget(LUA_REGISTRYINDEX);
 810                 if(state.rawequal(-1, -2)) {
 811                         state.pop(2);
 812                         return "FILE*";
 813                 }
 814                 state.pop(1);
 815                 state.pushlightuserdata(&classtable_meta_key);
 816                 state.rawget(LUA_REGISTRYINDEX);
 817                 if(state.rawequal(-1, -2)) {
 818                         state.pop(2);
 819                         return "classobj";
 820                 }
 821                 state.pop(1);
 822         }
 823         return "unknown";
 824 }
 825
 826 std::string try_print_userdata(state& L, int index)
 827 {
 828         for(auto i : userdata_recogn_fns())
 829                 if(i.is(L, index))
 830                         return i.print(L, index);
 831         //Hack: classobjs.
 832         if(L.getmetatable(index)) {
 833                 L.pushlightuserdata(&classtable_meta_key);
 834                 L.rawget(LUA_REGISTRYINDEX);
 835                 if(L.rawequal(-1, -2)) {
 836                         L.pop(2);
 837                         std::string cname = ((class_info*)L.touserdata(index))->obj->get_name();
 838                         return cname;
 839                 }
 840                 L.pop(1);
 841         }
 842         return "no data available";
 843 }
 844
 845 int state::vararg_tag::pushargs(state& L)
 846 {
 847         int e = 0;
 848         for(auto i : args) {
 849                 if(i == "")
 850                         L.pushnil();
 851                 else if(i == "true")
 852                         L.pushboolean(true);
 853                 else if(i == "false")
 854                         L.pushboolean(false);
 855                 else if(regex_match("[+-]?(|0|[1-9][0-9]*)(.[0-9]+)?([eE][+-]?(0|[1-9][0-9]*))?", i))
 856                         L.pushnumber(strtod(i.c_str(), NULL));
 857                 else if(i[0] == ':')
 858                         L.pushlstring(i.substr(1));
 859                 else
 860                         L.pushlstring(i);
 861                 e++;
 862         }
 863         return e;
 864 }
 865
 866 class_base* class_base::lookup(state& L, const std::string& _name)
 867 {
 868         if(lookup_and_push(L, _name)) {
 869                 class_base* obj = ((class_info*)L.touserdata(-1))->obj;
 870                 L.pop(1);
 871                 return obj;
 872         }
 873         return NULL;
 874 }
 875
 876 bool class_base::lookup_and_push(state& L, const std::string& _name)
 877 {
 878         L.pushlightuserdata(&classtable_key);
 879         L.rawget(LUA_REGISTRYINDEX);
 880         if(L.type(-1) == LUA_TNIL) {
 881                 //No classes.
 882                 L.pop(1);
 883                 return false;
 884         }
 885         //On top of stack there is class table.
 886         L.pushlstring(_name);
 887         L.rawget(-2);
 888         if(L.type(-1) == LUA_TNIL) {
 889                 //Not found.
 890                 L.pop(2);
 891                 return false;
 892         }
 893         L.insert(-2);
 894         L.pop(1);
 895         return true;
 896 }
 897
 898 std::set<std::string> class_base::all_classes(state& L)
 899 {
 900         L.pushlightuserdata(&classtable_key);
 901         L.rawget(LUA_REGISTRYINDEX);
 902         if(L.type(-1) == LUA_TNIL) {
 903                 //No classes.
 904                 L.pop(1);
 905                 return std::set<std::string>();
 906         }
 907         std::set<std::string> r;
 908         L.pushnil();
 909         while(L.next(-2)) {
 910                 L.pop(1);       //Pop value.
 911                 if(L.type(-1) == LUA_TSTRING) r.insert(L.tostring(-1));
 912         }
 913         L.pop(1);
 914         return r;
 915 }
 916
 917 void class_base::register_static(state& L)
 918 {
 919 again:
 920         L.pushlightuserdata(&classtable_key);
 921         L.rawget(LUA_REGISTRYINDEX);
 922         if(L.type(-1) == LUA_TNIL) {
 923                 L.pop(1);
 924                 L.pushlightuserdata(&classtable_key);
 925                 L.newtable();
 926                 L.rawset(LUA_REGISTRYINDEX);
 927                 goto again;
 928         }
 929         //On top of stack there is class table.
 930         L.pushlstring(name);
 931         L.rawget(-2);
 932         if(L.type(-1) != LUA_TNIL) {
 933                 //Already registered.
 934                 L.pop(2);
 935                 return;
 936         }
 937         L.pop(1);
 938         L.pushlstring(name);
 939         //Now construct the object.
 940         class_info* ci = (class_info*)L.newuserdata(sizeof(class_info));
 941         ci->obj = this;
 942 again2:
 943         L.pushlightuserdata(&classtable_meta_key);
 944         L.rawget(LUA_REGISTRYINDEX);
 945         if(L.type(-1) == LUA_TNIL) {
 946                 L.pop(1);
 947                 L.pushlightuserdata(&classtable_meta_key);
 948                 L.newtable();
 949                 L.pushstring("__index");
 950                 L.push_trampoline(class_info::index, 0);
 951                 L.rawset(-3);
 952                 L.pushstring("__newindex");
 953                 L.push_trampoline(class_info::newindex, 0);
 954                 L.rawset(-3);
 955                 L.pushstring("__pairs");
 956                 L.push_trampoline(class_info::pairs, 0);
 957                 L.rawset(-3);
 958                 L.rawset(LUA_REGISTRYINDEX);
 959                 goto again2;
 960         }
 961         L.setmetatable(-2);
 962         L.rawset(-3);
 963         L.pop(1);
 964 }
 965
 966 void class_base::delayed_register()
 967 {
 968         group.do_register(name, *this);
 969 }
 970
 971 functions::functions(function_group& grp, const std::string& basetable, std::initializer_list<entry> fnlist)
 972 {
 973         std::string base = (basetable == "") ? "" : (basetable + ".");
 974         for(auto i : fnlist)
 975                 funcs.insert(new fn(grp, base + i.name, i.func));
 976 }
 977
 978 functions::~functions()
 979 {
 980         for(auto i : funcs)
 981                 delete i;
 982 }
 983
 984 functions::fn::fn(function_group& grp, const std::string& name, std::function<int(state& L, parameters& P)> _func)
 985         : function(grp, name)
 986 {
 987         func = _func;
 988 }
 989
 990 functions::fn::~fn() throw()
 991 {
 992 }
 993
 994 int functions::fn::invoke(state& L)
 995 {
 996         lua::parameters P(L, fname);
 997         return func(L, P);
 998 }
 999 }