src/open.cpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 #include <luabind/lua_include.hpp>
  24
  25 #include <luabind/luabind.hpp>
  26 #include <luabind/function.hpp>
  27
  28 namespace luabind {
  29
  30     void open(lua_State* L)
  31     {
  32         // get the global class registry, or create one if it doesn't exist
  33         // (it's global within a lua state)
  34         detail::class_registry* r = 0;
  35
  36         // If you hit this assert it's because you have called luabind::open()
  37         // twice on the same lua_State.
  38         assert((detail::class_registry::get_registry(L) == 0)
  39             && "you cannot call luabind::open() twice");
  40
  41         lua_pushstring(L, "__luabind_classes");
  42         r = static_cast<detail::class_registry*>(
  43             lua_newuserdata(L, sizeof(detail::class_registry)));
  44
  45         // set gc metatable
  46         lua_newtable(L);
  47         lua_pushstring(L, "__gc");
  48         lua_pushcclosure(
  49             L
  50           , detail::garbage_collector_s<
  51                 detail::class_registry
  52             >::apply
  53           , 0);
  54
  55         lua_settable(L, -3);
  56         lua_setmetatable(L, -2);
  57
  58         new(r) detail::class_registry(L);
  59         lua_settable(L, LUA_REGISTRYINDEX);
  60
  61         // add functions (class, cast etc...)
  62         lua_pushstring(L, "class");
  63         lua_pushcclosure(L, detail::create_class::stage1, 0);
  64         lua_settable(L, LUA_GLOBALSINDEX);
  65     }
  66
  67 } // namespace luabind
  68