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 <functional>
   9 #include <iostream>
  10 #include <cassert>
  11
  12 namespace lua
  13 {
  14 namespace
  15 {
  16         threads::rlock* global_lock;
  17         threads::rlock& get_lua_lock()
  18         {
  19                 if(!global_lock) global_lock = new threads::rlock;
  20                 return *global_lock;
  21         }
  22
  23         struct state_internal
  24         {
  25                 std::map<std::string, state::callback_list*> callbacks;
  26                 std::set<std::pair<function_group*, int>> function_groups;
  27                 std::set<std::pair<class_group*, int>> class_groups;
  28         };
  29
  30         struct fgroup_internal
  31         {
  32                 fgroup_internal()
  33                 {
  34                         next_handle = 0;
  35                 }
  36                 std::map<std::string, function*> functions;
  37                 int next_handle;
  38                 std::map<int, std::function<void(std::string, function*)>> callbacks;
  39                 std::map<int, std::function<void(function_group*)>> dcallbacks;
  40         };
  41
  42         struct cgroup_internal
  43         {
  44                 cgroup_internal()
  45                 {
  46                         next_handle = 0;
  47                 }
  48                 int next_handle;
  49                 std::map<std::string, class_base*> classes;
  50                 std::map<int, std::function<void(std::string, class_base*)>> callbacks;
  51                 std::map<int, std::function<void(class_group*)>> dcallbacks;
  52         };
  53
  54         typedef stateobject::type<state, state_internal> state_internal_t;
  55         typedef stateobject::type<function_group, fgroup_internal> fgroup_internal_t;
  56         typedef stateobject::type<class_group, cgroup_internal> cgroup_internal_t;
  57 }
  58
  59 std::unordered_map<std::type_index, void*>& class_types()
  60 {
  61         static std::unordered_map<std::type_index, void*> x;
  62         return x;
  63 }
  64 namespace
  65 {
  66         char classtable_key;
  67         char classtable_meta_key;
  68
  69         struct class_info
  70         {
  71                 class_base* obj;
  72                 static int index(state& L);
  73                 static int newindex(state& L);
  74                 static int pairs(state& L);
  75                 static int pairs_next(state& L);
  76                 static int smethods(state& L);
  77                 static int cmethods(state& L);
  78                 static int trampoline(state& L);
  79                 static void check(state& L);
  80         };
  81
  82         void class_info::check(state& L)
  83         {
  84                 L.pushlightuserdata(&classtable_meta_key);
  85                 L.rawget(LUA_REGISTRYINDEX);
  86                 L.getmetatable(1);
  87                 if(!L.rawequal(-1, -2))
  88                         throw std::runtime_error("Bad class table");
  89                 L.pop(2);
  90         }
  91
  92         int class_info::index(state& L)
  93         {
  94                 check(L);
  95
  96                 class_base* ptr = ((class_info*)L.touserdata(1))->obj;
  97                 const char* method = L.tostring(2);
  98                 if(!method)
  99                         throw std::runtime_error("Indexing invalid element of class table");
 100                 if(!strcmp(method, "_static_methods")) {
 101                         L.pushlightuserdata(ptr);
 102                         L.push_trampoline(class_info::smethods, 1);
 103                         return 1;
 104                 } else if(!strcmp(method, "_class_methods")) {
 105                         L.pushlightuserdata(ptr);
 106                         L.push_trampoline(class_info::cmethods, 1);
 107                         return 1;
 108                 } else {
 109                         auto m = ptr->static_methods();
 110                         for(auto i : m) {
 111                                 if(!strcmp(i.name, method)) {
 112                                         //Hit.
 113                                         std::string fname = ptr->get_name() + "::" + i.name;
 114                                         L.pushlightuserdata((void*)i.fn);
 115                                         L.pushstring(fname.c_str());
 116                                         L.push_trampoline(class_info::trampoline, 2);
 117                                         return 1;
 118                                 }
 119                         }
 120                         std::string err = std::string("Class '") + ptr->get_name() +
 121                                 "' does not have static method '" + method + "'";
 122                         throw std::runtime_error(err);
 123                 }
 124                 return 0; //NOTREACHED
 125         }
 126         int class_info::newindex(state& L)
 127         {
 128                 throw std::runtime_error("Writing into class table not allowed");
 129         }
 130
 131         int class_info::pairs(state& L)
 132         {
 133                 check(L);
 134
 135                 L.push_trampoline(class_info::pairs_next, 0);   //Next.
 136                 L.pushvalue(1);                                 //State.
 137                 L.pushnil();                                    //Index.
 138                 return 3;
 139         }
 140
 141         int class_info::pairs_next(state& L)
 142         {
 143                 check(L);
 144
 145                 class_base* obj = ((class_info*)L.touserdata(1))->obj;
 146                 auto m = obj->static_methods();
 147                 std::string key = (L.type(2) == LUA_TSTRING) ? L.tostring(2) : "";
 148                 std::string lowbound = "\xFF";  //Sorts greater than anything that is valid UTF-8.
 149                 void* best_fn = NULL;
 150                 for(auto i : m)
 151                         if(lowbound > i.name && i.name > key) {
 152                                 lowbound = i.name;
 153                                 best_fn = (void*)i.fn;
 154                         }
 155                 if(best_fn) {
 156                         L.pushlstring(lowbound);
 157                         std::string name = obj->get_name() + "::" + lowbound;
 158                         L.pushlightuserdata(best_fn);
 159                         L.pushlstring(name);
 160                         L.push_trampoline(class_info::trampoline, 2);
 161                         return 2;
 162                 } else {
 163                         L.pushnil();
 164                         return 1;
 165                 }
 166         }
 167
 168         int class_info::smethods(state& L)
 169         {
 170                 class_base* obj = (class_base*)L.touserdata(L.trampoline_upval(1));
 171                 auto m = obj->static_methods();
 172                 int rets = 0;
 173                 for(auto i : m) {
 174                         L.pushstring(i.name);
 175                         rets++;
 176                 }
 177                 return rets;
 178         }
 179
 180         int class_info::cmethods(state& L)
 181         {
 182                 class_base* obj = (class_base*)L.touserdata(L.trampoline_upval(1));
 183                 auto m = obj->class_methods();
 184                 int rets = 0;
 185                 for(auto i : m) {
 186                         L.pushstring(i.c_str());
 187                         rets++;
 188                 }
 189                 return rets;
 190         }
 191
 192         typedef int (*fn_t)(state& L, parameters& P);
 193         typedef int (*fnraw_t)(state& L);
 194
 195         //2 upvalues:
 196         //1) Pointer to function control block.
 197         //2) Pointer to method name.
 198         int class_info::trampoline(state& L)
 199         {
 200                 void* _fn = L.touserdata(L.trampoline_upval(1));
 201                 fn_t fn = (fn_t)_fn;
 202                 std::string name = L.tostring(L.trampoline_upval(2));
 203                 parameters P(L, name);
 204                 return fn(L, P);
 205         }
 206
 207         //1 upvalue:
 208         //1) Pointer to function control block.
 209         int lua_trampoline_function(state& L)
 210         {
 211                 void* ptr = L.touserdata(L.trampoline_upval(1));
 212                 function* f = reinterpret_cast<function*>(ptr);
 213                 return f->invoke(L);
 214         }
 215
 216         //2 upvalues.
 217         //1) Pointer to master state.
 218         //2) Poiinter to function to call.
 219         int lua_main_trampoline(lua_State* L)
 220         {
 221                 state* lstate = reinterpret_cast<state*>(lua_touserdata(L, lua_upvalueindex(1)));
 222                 void* _fn = lua_touserdata(L, lua_upvalueindex(2));
 223                 fnraw_t fn = (fnraw_t)_fn;
 224                 //The function is always run in non-set_interruptable mode.
 225                 try {
 226                         state _L(*lstate, L);
 227                         lstate->set_interruptable_flag(false);
 228                         int r = fn(_L);
 229                         lstate->set_interruptable_flag(true);
 230                         return r;
 231                 } catch(std::exception& e) {
 232                         lua_pushfstring(L, "%s", e.what());
 233                         lstate->set_interruptable_flag(true);
 234                         lua_error(L);
 235                 }
 236                 return 0;
 237         }
 238
 239         //Pushes given table to top of stack, creating if needed.
 240         void recursive_lookup_table(state& L, const std::string& tab)
 241         {
 242                 if(tab == "") {
 243                         L.pushglobals();
 244                         assert(L.type(-1) == LUA_TTABLE);
 245                         return;
 246                 }
 247                 std::string u = tab;
 248                 size_t split = u.find_last_of(".");
 249                 std::string u1;
 250                 std::string u2 = u;
 251                 if(split < u.length()) {
 252                         u1 = u.substr(0, split);
 253                         u2 = u.substr(split + 1);
 254                 }
 255                 recursive_lookup_table(L, u1);
 256                 L.getfield(-1, u2.c_str());
 257                 if(L.type(-1) != LUA_TTABLE) {
 258                         //Not a table, create a table.
 259                         L.pop(1);
 260                         L.newtable();
 261                         L.setfield(-2, u2.c_str());
 262                         L.getfield(-1, u2.c_str());
 263                 }
 264                 //Get rid of previous table.
 265                 L.insert(-2);
 266                 L.pop(1);
 267         }
 268
 269         void register_function(state& L, const std::string& name, function* fun)
 270         {
 271                 std::string u = name;
 272                 size_t split = u.find_last_of(".");
 273                 std::string u1;
 274                 std::string u2 = u;
 275                 if(split < u.length()) {
 276                         u1 = u.substr(0, split);
 277                         u2 = u.substr(split + 1);
 278                 }
 279                 recursive_lookup_table(L, u1);
 280                 if(!fun)
 281                         L.pushnil();
 282                 else {
 283                         void* ptr = reinterpret_cast<void*>(fun);
 284                         L.pushlightuserdata(ptr);
 285                         L.push_trampoline(lua_trampoline_function, 1);
 286                 }
 287                 L.setfield(-2, u2.c_str());
 288                 L.pop(1);
 289         }
 290
 291         void register_class(state& L, const std::string& name, class_base* fun)
 292         {
 293                 fun->register_state(L);
 294         }
 295
 296         int run_interruptable_trampoline(lua_State* L)
 297         {
 298                 //Be very careful with faults here! We are running in interruptable context.
 299                 static std::string err;
 300                 auto& fn = *(std::function<void()>*)lua_touserdata(L, -1);
 301                 int out = lua_tonumber(L, -2);
 302                 lua_pop(L, 2);  //fn is passed as a pointer, so popping it is OK.
 303                 try {
 304                         fn();
 305                 } catch(std::exception& e) {
 306                         err = e.what();
 307                         //This can fault, so err is static.
 308                         lua_pushlstring(L, err.c_str(), err.length());
 309                         lua_error(L);
 310                 }
 311                 return out;
 312         }
 313 }
 314
 315 state::state() throw(std::bad_alloc)
 316 {
 317         master = NULL;
 318         lua_handle = NULL;
 319         oom_handler = builtin_oom;
 320         soft_oom_handler = builtin_soft_oom;
 321         interruptable = false;          //Assume initially not interruptable.
 322         memory_limit = (size_t)-1;      //Unlimited.
 323         memory_use = 0;
 324 }
 325
 326 state::state(state& _master, lua_State* L)
 327 {
 328         master = &_master;
 329         lua_handle = L;
 330 }
 331
 332 state::~state() throw()
 333 {
 334         if(master)
 335                 return;
 336         threads::arlock h(get_lua_lock());
 337         auto state = state_internal_t::get_soft(this);
 338         if(!state) return;
 339         for(auto i : state->function_groups)
 340                 i.first->drop_callback(i.second);
 341         for(auto i : state->class_groups)
 342                 i.first->drop_callback(i.second);
 343         if(lua_handle)
 344                 lua_close(lua_handle);
 345         state_internal_t::clear(this);
 346 }
 347
 348 void state::builtin_oom()
 349 {
 350         std::cerr << "PANIC: FATAL: Out of memory" << std::endl;
 351         exit(1);
 352 }
 353
 354 void state::builtin_soft_oom(int status)
 355 {
 356         if(status == 0)
 357                 std::cerr << "Lua: Memory limit exceeded, attempting to free memory..." << std::endl;
 358         if(status < 0)
 359                 std::cerr << "Lua: Memory allocation still failed." << std::endl;
 360         if(status > 0)
 361                 std::cerr << "Lua: Allocation successful after freeing some memory." << std::endl;
 362 }
 363
 364 void* state::builtin_alloc(void* user, void* old, size_t olds, size_t news)
 365 {
 366         void* m;
 367         auto& st = *reinterpret_cast<state*>(user);
 368         if(news) {
 369                 if(news > olds && !st.charge_memory(news - olds, false)) {
 370                         goto retry_allocation;
 371                 }
 372                 m = realloc(old, news);
 373                 if(!m && !st.get_interruptable_flag())
 374                         st.oom_handler();
 375                 if(!m) {
 376                         st.charge_memory(news - olds, true);    //Undo commit.
 377                         goto retry_allocation;
 378                 }
 379                 if(news < olds)
 380                         st.charge_memory(olds - news, true);    //Release memory.
 381                 if(m && st.memory_change) st.memory_change((ssize_t)news - (ssize_t)olds);
 382                 return m;
 383         } else {
 384                 st.charge_memory(olds, true);   //Release memory.
 385                 if(st.memory_change) st.memory_change(-(ssize_t)olds);
 386                 free(old);
 387         }
 388         return NULL;
 389 retry_allocation:
 390         st.soft_oom_handler(0);
 391         st.interruptable = false;                       //Give everything we got for the GC.
 392         lua_gc(st.lua_handle, LUA_GCCOLLECT,0);         //Do full cycle to try to free some memory.
 393         st.interruptable = true;
 394         if(!st.charge_memory(news - olds, false)) {     //Try to see if memory can be allocated.
 395                 st.soft_oom_handler(-1);
 396                 return NULL;
 397         }
 398         m = realloc(old, news);
 399         if(!m && news > olds)
 400                 st.charge_memory(news - olds, true);    //Undo commit.
 401         st.soft_oom_handler(m ? 1 : -1);
 402         if(m && st.memory_change) st.memory_change((ssize_t)news - (ssize_t)olds);
 403         return m;
 404 }
 405
 406 void state::push_trampoline(int(*fn)(state& L), unsigned n_upvals)
 407 {
 408         lua_pushlightuserdata(lua_handle, (void*)&get_master());
 409         lua_pushlightuserdata(lua_handle, (void*)fn);
 410         if(n_upvals > 0) {
 411                 lua_insert(lua_handle, -(int)n_upvals - 2);
 412                 lua_insert(lua_handle, -(int)n_upvals - 2);
 413         }
 414         lua_pushcclosure(lua_handle, lua_main_trampoline, trampoline_upvals + n_upvals);
 415 }
 416
 417 //Lua 5.1 doesn't define LUA_OK.
 418 #ifndef LUA_OK
 419 #define LUA_OK 0
 420 #endif
 421
 422 void state::run_interruptable(std::function<void()> fn, unsigned in, unsigned out)
 423 {
 424         pushnumber(out);
 425         pushlightuserdata(&fn);
 426         pushcfunction(run_interruptable_trampoline);
 427         insert(-(int)in - 3);
 428         int r = pcall(in + 2, out, 0);
 429         if(r == LUA_OK) {
 430                 //Nothing.
 431         } else if(r == LUA_ERRRUN) {
 432                 throw std::runtime_error(tostring(-1));
 433         } else if(r == LUA_ERRMEM) {
 434                 throw std::runtime_error("Lua out of memory");
 435         } else if(r == LUA_ERRERR) {
 436                 throw std::runtime_error("Lua double fault");
 437 #ifdef LUA_ERRGCMM
 438         } else if(r == LUA_ERRGCMM) {
 439                 throw std::runtime_error("Lua fault in garbage collector");
 440 #endif
 441         }
 442 }
 443
 444 bool state::charge_memory(size_t amount, bool release)
 445 {
 446         if(master) return master->charge_memory(amount, release);
 447         if(release) {
 448                 if(memory_use > amount)
 449                         memory_use -= amount;
 450                 else
 451                         memory_use = 0;
 452                 return true;
 453         }
 454         if(!interruptable) {
 455                 //Give everything we got.
 456                 memory_use += amount;
 457                 return true;
 458         } else {
 459                 //Check limit and refuse allocations too large.
 460                 if(memory_use + amount > memory_limit || memory_use + amount < amount)
 461                         return false;
 462                 memory_use += amount;
 463                 return true;
 464         }
 465 }
 466
 467 function::function(function_group& _group, const std::string& func) throw(std::bad_alloc)
 468         : group(_group)
 469 {
 470         group.do_register(fname = func, *this);
 471 }
 472
 473 function::~function() throw()
 474 {
 475         group.do_unregister(fname, *this);
 476 }
 477
 478 class_base::class_base(class_group& _group, const std::string& _name)
 479         : group(_group), name(_name)
 480 {
 481         registered = false;
 482 }
 483
 484 class_base::~class_base() throw()
 485 {
 486         if(registered)
 487                 group.do_unregister(name, *this);
 488 }
 489
 490 void state::reset() throw(std::bad_alloc, std::runtime_error)
 491 {
 492         if(master)
 493                 return master->reset();
 494         threads::arlock h(get_lua_lock());
 495         auto state = &state_internal_t::get(this);
 496         if(lua_handle) {
 497                 lua_State* tmp = lua_newstate(state::builtin_alloc, this);
 498                 if(!tmp)
 499                         throw std::runtime_error("Can't re-initialize Lua interpretter");
 500                 lua_close(lua_handle);
 501                 for(auto& i : state->callbacks)
 502                         i.second->clear();
 503                 lua_handle = tmp;
 504         } else {
 505                 //Initialize new.
 506                 lua_handle = lua_newstate(state::builtin_alloc, this);
 507                 if(!lua_handle)
 508                         throw std::runtime_error("Can't initialize Lua interpretter");
 509         }
 510         for(auto i : state->function_groups)
 511                 i.first->request_callback([this](std::string name, function* func) -> void {
 512                         register_function(*this, name, func);
 513                 });
 514         for(auto i : state->class_groups)
 515                 i.first->request_callback([this](std::string name, class_base* clazz) -> void {
 516                         register_class(*this, name, clazz);
 517                 });
 518 }
 519
 520 void state::deinit() throw()
 521 {
 522         if(master)
 523                 return master->deinit();
 524         if(lua_handle)
 525                 lua_close(lua_handle);
 526         lua_handle = NULL;
 527 }
 528
 529 void state::add_function_group(function_group& group)
 530 {
 531         threads::arlock h(get_lua_lock());
 532         auto& state = state_internal_t::get(this);
 533         state.function_groups.insert(std::make_pair(&group, group.add_callback([this](const std::string& name,
 534                 function* func) -> void {
 535                 this->function_callback(name, func);
 536         }, [this](function_group* x) {
 537                 threads::arlock h(get_lua_lock());
 538                 auto state = state_internal_t::get_soft(this);
 539                 if(!state) return;
 540                 for(auto i = state->function_groups.begin(); i != state->function_groups.end();)
 541                         if(i->first == x)
 542                                 i = state->function_groups.erase(i);
 543                         else
 544                                 i++;
 545         })));
 546 }
 547
 548 void state::add_class_group(class_group& group)
 549 {
 550         threads::arlock h(get_lua_lock());
 551         auto& state = state_internal_t::get(this);
 552         state.class_groups.insert(std::make_pair(&group, group.add_callback([this](const std::string& name,
 553                 class_base* clazz) -> void {
 554                 this->class_callback(name, clazz);
 555         }, [this](class_group* x) {
 556                 threads::arlock h(get_lua_lock());
 557                 auto state = state_internal_t::get_soft(this);
 558                 if(!state) return;
 559                 for(auto i = state->class_groups.begin(); i != state->class_groups.end();)
 560                         if(i->first == x)
 561                                 i = state->class_groups.erase(i);
 562                         else
 563                                 i++;
 564         })));
 565 }
 566
 567 void state::function_callback(const std::string& name, function* func)
 568 {
 569         if(master)
 570                 return master->function_callback(name, func);
 571         if(lua_handle)
 572                 register_function(*this, name, func);
 573 }
 574
 575 void state::class_callback(const std::string& name, class_base* clazz)
 576 {
 577         if(master)
 578                 return master->class_callback(name, clazz);
 579         if(lua_handle)
 580                 register_class(*this, name, clazz);
 581 }
 582
 583 bool state::do_once(void* key)
 584 {
 585         if(master)
 586                 return master->do_once(key);
 587         pushlightuserdata(key);
 588         rawget(LUA_REGISTRYINDEX);
 589         if(type(-1) == LUA_TNIL) {
 590                 pop(1);
 591                 pushlightuserdata(key);
 592                 pushlightuserdata(key);
 593                 rawset(LUA_REGISTRYINDEX);
 594                 return true;
 595         } else {
 596                 pop(1);
 597                 return false;
 598         }
 599 }
 600
 601 std::list<state::callback_list*> state::get_callbacks()
 602 {
 603         if(master)
 604                 return master->get_callbacks();
 605         threads::arlock h(get_lua_lock());
 606         auto state = state_internal_t::get_soft(this);
 607         std::list<callback_list*> r;
 608         if(state)
 609                 for(auto i : state->callbacks)
 610                         r.push_back(i.second);
 611         return r;
 612 }
 613
 614 void state::do_register(const std::string& name, callback_list& callback)
 615 {
 616         threads::arlock h(get_lua_lock());
 617         auto& state = state_internal_t::get(this);
 618         if(state.callbacks.count(name)) return;
 619         state.callbacks[name] = &callback;
 620 }
 621
 622 void state::do_unregister(const std::string& name, callback_list& callback)
 623 {
 624         threads::arlock h(get_lua_lock());
 625         auto state = state_internal_t::get_soft(this);
 626         if(state && state->callbacks.count(name) && state->callbacks[name] == &callback)
 627                 state->callbacks.erase(name);
 628 }
 629
 630 state::callback_list::callback_list(state& _L, const std::string& _name, const std::string& fncbname)
 631         : L(_L), name(_name), fn_cbname(fncbname)
 632 {
 633         L.do_register(name, *this);
 634 }
 635
 636 state::callback_list::~callback_list()
 637 {
 638         L.do_unregister(name, *this);
 639         if(!L.handle())
 640                 return;
 641         for(auto& i : callbacks) {
 642                 L.pushlightuserdata(&i);
 643                 L.pushnil();
 644                 L.rawset(LUA_REGISTRYINDEX);
 645         }
 646 }
 647
 648 void state::callback_list::_register(state& _L)
 649 {
 650         callbacks.push_back(0);
 651         _L.pushlightuserdata(&*callbacks.rbegin());
 652         _L.pushvalue(-2);
 653         _L.rawset(LUA_REGISTRYINDEX);
 654 }
 655
 656 void state::callback_list::_unregister(state& _L)
 657 {
 658         for(auto i = callbacks.begin(); i != callbacks.end();) {
 659                 _L.pushlightuserdata(&*i);
 660                 _L.rawget(LUA_REGISTRYINDEX);
 661                 if(_L.rawequal(-1, -2)) {
 662                         char* key = &*i;
 663                         _L.pushlightuserdata(key);
 664                         _L.pushnil();
 665                         _L.rawset(LUA_REGISTRYINDEX);
 666                         i = callbacks.erase(i);
 667                 } else
 668                         i++;
 669                 _L.pop(1);
 670         }
 671 }
 672
 673 function_group::function_group()
 674 {
 675 }
 676
 677 function_group::~function_group()
 678 {
 679         threads::arlock h(get_lua_lock());
 680         auto state = fgroup_internal_t::get_soft(this);
 681         if(!state) return;
 682         for(auto i : state->dcallbacks)
 683                 i.second(this);
 684         fgroup_internal_t::clear(this);
 685 }
 686
 687 void function_group::request_callback(std::function<void(std::string, function*)> cb)
 688 {
 689         threads::arlock h(get_lua_lock());
 690         auto state = fgroup_internal_t::get_soft(this);
 691         if(!state) return;
 692         for(auto i : state->functions)
 693                 cb(i.first, i.second);
 694 }
 695
 696 int function_group::add_callback(std::function<void(std::string, function*)> cb,
 697         std::function<void(function_group*)> dcb)
 698 {
 699         threads::arlock h(get_lua_lock());
 700         auto& state = fgroup_internal_t::get(this);
 701         int handle = state.next_handle++;
 702         state.callbacks[handle] = cb;
 703         state.dcallbacks[handle] = dcb;
 704         for(auto i : state.functions)
 705                 cb(i.first, i.second);
 706         return handle;
 707 }
 708
 709 void function_group::drop_callback(int handle)
 710 {
 711         threads::arlock h(get_lua_lock());
 712         auto state = fgroup_internal_t::get_soft(this);
 713         if(!state) return;
 714         state->callbacks.erase(handle);
 715 }
 716
 717 void function_group::do_register(const std::string& name, function& fun)
 718 {
 719         threads::arlock h(get_lua_lock());
 720         auto& state = fgroup_internal_t::get(this);
 721         if(state.functions.count(name)) return;
 722         state.functions[name] = &fun;
 723         for(auto i : state.callbacks)
 724                 i.second(name, &fun);
 725 }
 726
 727 void function_group::do_unregister(const std::string& name, function& fun)
 728 {
 729         threads::arlock h(get_lua_lock());
 730         auto state = fgroup_internal_t::get_soft(this);
 731         if(!state || !state->functions.count(name) || state->functions[name] != &fun) return;
 732         state->functions.erase(name);
 733         for(auto i : state->callbacks)
 734                 i.second(name, NULL);
 735 }
 736
 737 class_group::class_group()
 738 {
 739 }
 740
 741 class_group::~class_group()
 742 {
 743         threads::arlock h(get_lua_lock());
 744         auto state = cgroup_internal_t::get_soft(this);
 745         if(!state) return;
 746         for(auto i : state->dcallbacks)
 747                 i.second(this);
 748         cgroup_internal_t::clear(this);
 749 }
 750
 751 void class_group::request_callback(std::function<void(std::string, class_base*)> cb)
 752 {
 753         threads::arlock h(get_lua_lock());
 754         auto state = cgroup_internal_t::get_soft(this);
 755         if(!state) return;
 756         for(auto i : state->classes)
 757                 cb(i.first, i.second);
 758 }
 759
 760 int class_group::add_callback(std::function<void(std::string, class_base*)> cb,
 761         std::function<void(class_group*)> dcb)
 762 {
 763         threads::arlock h(get_lua_lock());
 764         auto& state = cgroup_internal_t::get(this);
 765         int handle = state.next_handle++;
 766         state.callbacks[handle] = cb;
 767         state.dcallbacks[handle] = dcb;
 768         for(auto i : state.classes)
 769                 cb(i.first, i.second);
 770         return handle;
 771 }
 772
 773 void class_group::drop_callback(int handle)
 774 {
 775         threads::arlock h(get_lua_lock());
 776         auto state = cgroup_internal_t::get_soft(this);
 777         if(!state) return;
 778         state->callbacks.erase(handle);
 779 }
 780
 781 void class_group::do_register(const std::string& name, class_base& fun)
 782 {
 783         threads::arlock h(get_lua_lock());
 784         auto& state = cgroup_internal_t::get(this);
 785         if(state.classes.count(name)) return;
 786         state.classes[name] = &fun;
 787         for(auto i : state.callbacks)
 788                 i.second(name, &fun);
 789 }
 790
 791 void class_group::do_unregister(const std::string& name, class_base& fun)
 792 {
 793         threads::arlock h(get_lua_lock());
 794         auto state = cgroup_internal_t::get_soft(this);
 795         if(!state || !state->classes.count(name) || state->classes[name] != &fun) return;
 796         state->classes.erase(name);
 797         for(auto i : state->callbacks)
 798                 i.second(name, NULL);
 799 }
 800
 801 std::list<class_ops>& userdata_recogn_fns()
 802 {
 803         static std::list<class_ops> x;
 804         return x;
 805 }
 806
 807 std::string try_recognize_userdata(state& state, int index)
 808 {
 809         for(auto i : userdata_recogn_fns())
 810                 if(i.is(state, index))
 811                         return i.name();
 812         //Hack: Lua builtin file objects and classobjs.
 813         if(state.getmetatable(index)) {
 814                 state.pushstring("FILE*");
 815                 state.rawget(LUA_REGISTRYINDEX);
 816                 if(state.rawequal(-1, -2)) {
 817                         state.pop(2);
 818                         return "FILE*";
 819                 }
 820                 state.pop(1);
 821                 state.pushlightuserdata(&classtable_meta_key);
 822                 state.rawget(LUA_REGISTRYINDEX);
 823                 if(state.rawequal(-1, -2)) {
 824                         state.pop(2);
 825                         return "classobj";
 826                 }
 827                 state.pop(1);
 828         }
 829         return "unknown";
 830 }
 831
 832 std::string try_print_userdata(state& L, int index)
 833 {
 834         for(auto i : userdata_recogn_fns())
 835                 if(i.is(L, index))
 836                         return i.print(L, index);
 837         //Hack: classobjs.
 838         if(L.getmetatable(index)) {
 839                 L.pushlightuserdata(&classtable_meta_key);
 840                 L.rawget(LUA_REGISTRYINDEX);
 841                 if(L.rawequal(-1, -2)) {
 842                         L.pop(2);
 843                         std::string cname = ((class_info*)L.touserdata(index))->obj->get_name();
 844                         return cname;
 845                 }
 846                 L.pop(1);
 847         }
 848         return "no data available";
 849 }
 850
 851 int state::vararg_tag::pushargs(state& L)
 852 {
 853         int e = 0;
 854         for(auto i : args) {
 855                 if(i == "")
 856                         L.pushnil();
 857                 else if(i == "true")
 858                         L.pushboolean(true);
 859                 else if(i == "false")
 860                         L.pushboolean(false);
 861                 else if(regex_match("[+-]?(|0|[1-9][0-9]*)(.[0-9]+)?([eE][+-]?(0|[1-9][0-9]*))?", i))
 862                         L.pushnumber(strtod(i.c_str(), NULL));
 863                 else if(i[0] == ':')
 864                         L.pushlstring(i.substr(1));
 865                 else
 866                         L.pushlstring(i);
 867                 e++;
 868         }
 869         return e;
 870 }
 871
 872 class_base* class_base::lookup(state& L, const std::string& _name)
 873 {
 874         if(lookup_and_push(L, _name)) {
 875                 class_base* obj = ((class_info*)L.touserdata(-1))->obj;
 876                 L.pop(1);
 877                 return obj;
 878         }
 879         return NULL;
 880 }
 881
 882 bool class_base::lookup_and_push(state& L, const std::string& _name)
 883 {
 884         L.pushlightuserdata(&classtable_key);
 885         L.rawget(LUA_REGISTRYINDEX);
 886         if(L.type(-1) == LUA_TNIL) {
 887                 //No classes.
 888                 L.pop(1);
 889                 return false;
 890         }
 891         //On top of stack there is class table.
 892         L.pushlstring(_name);
 893         L.rawget(-2);
 894         if(L.type(-1) == LUA_TNIL) {
 895                 //Not found.
 896                 L.pop(2);
 897                 return false;
 898         }
 899         L.insert(-2);
 900         L.pop(1);
 901         return true;
 902 }
 903
 904 std::set<std::string> class_base::all_classes(state& L)
 905 {
 906         L.pushlightuserdata(&classtable_key);
 907         L.rawget(LUA_REGISTRYINDEX);
 908         if(L.type(-1) == LUA_TNIL) {
 909                 //No classes.
 910                 L.pop(1);
 911                 return std::set<std::string>();
 912         }
 913         std::set<std::string> r;
 914         L.pushnil();
 915         while(L.next(-2)) {
 916                 L.pop(1);       //Pop value.
 917                 if(L.type(-1) == LUA_TSTRING) r.insert(L.tostring(-1));
 918         }
 919         L.pop(1);
 920         return r;
 921 }
 922
 923 void class_base::register_static(state& L)
 924 {
 925 again:
 926         L.pushlightuserdata(&classtable_key);
 927         L.rawget(LUA_REGISTRYINDEX);
 928         if(L.type(-1) == LUA_TNIL) {
 929                 L.pop(1);
 930                 L.pushlightuserdata(&classtable_key);
 931                 L.newtable();
 932                 L.rawset(LUA_REGISTRYINDEX);
 933                 goto again;
 934         }
 935         //On top of stack there is class table.
 936         L.pushlstring(name);
 937         L.rawget(-2);
 938         if(L.type(-1) != LUA_TNIL) {
 939                 //Already registered.
 940                 L.pop(2);
 941                 return;
 942         }
 943         L.pop(1);
 944         L.pushlstring(name);
 945         //Now construct the object.
 946         class_info* ci = (class_info*)L.newuserdata(sizeof(class_info));
 947         ci->obj = this;
 948 again2:
 949         L.pushlightuserdata(&classtable_meta_key);
 950         L.rawget(LUA_REGISTRYINDEX);
 951         if(L.type(-1) == LUA_TNIL) {
 952                 L.pop(1);
 953                 L.pushlightuserdata(&classtable_meta_key);
 954                 L.newtable();
 955                 L.pushstring("__index");
 956                 L.push_trampoline(class_info::index, 0);
 957                 L.rawset(-3);
 958                 L.pushstring("__newindex");
 959                 L.push_trampoline(class_info::newindex, 0);
 960                 L.rawset(-3);
 961                 L.pushstring("__pairs");
 962                 L.push_trampoline(class_info::pairs, 0);
 963                 L.rawset(-3);
 964                 L.rawset(LUA_REGISTRYINDEX);
 965                 goto again2;
 966         }
 967         L.setmetatable(-2);
 968         L.rawset(-3);
 969         L.pop(1);
 970 }
 971
 972 void class_base::delayed_register()
 973 {
 974         group.do_register(name, *this);
 975 }
 976
 977 functions::functions(function_group& grp, const std::string& basetable, std::initializer_list<entry> fnlist)
 978 {
 979         std::string base = (basetable == "") ? "" : (basetable + ".");
 980         for(auto i : fnlist)
 981                 funcs.insert(new fn(grp, base + i.name, i.func));
 982 }
 983
 984 functions::~functions()
 985 {
 986         for(auto i : funcs)
 987                 delete i;
 988 }
 989
 990 functions::fn::fn(function_group& grp, const std::string& name, std::function<int(state& L, parameters& P)> _func)
 991         : function(grp, name)
 992 {
 993         func = _func;
 994 }
 995
 996 functions::fn::~fn() throw()
 997 {
 998 }
 999
1000 int functions::fn::invoke(state& L)
1001 {
1002         lua::parameters P(L, fname);
1003         return func(L, P);
1004 }
1005 }