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/class_info.hpp>
  27 #include <luabind/function.hpp>
  28
  29 namespace luabind {
  30
  31     void open(lua_State* L)
  32     {
  33         // get the global class registry, or create one if it doesn't exist
  34         // (it's global within a lua state)
  35         detail::class_registry* r = 0;
  36
  37         // If you hit this assert it's because you have called luabind::open()
  38         // twice on the same lua_State.
  39         assert((detail::class_registry::get_registry(L) == 0)
  40             && "you cannot call luabind::open() twice");
  41
  42         lua_pushstring(L, "__luabind_classes");
  43         r = static_cast<detail::class_registry*>(
  44             lua_newuserdata(L, sizeof(detail::class_registry)));
  45
  46         // set gc metatable
  47         lua_newtable(L);
  48         lua_pushstring(L, "__gc");
  49         lua_pushcclosure(
  50             L
  51           , detail::garbage_collector_s<
  52                 detail::class_registry
  53             >::apply
  54           , 0);
  55
  56         lua_settable(L, -3);
  57         lua_setmetatable(L, -2);
  58
  59         new(r) detail::class_registry(L);
  60         lua_settable(L, LUA_REGISTRYINDEX);
  61
  62         // add functions (class, cast etc...)
  63         lua_pushstring(L, "class");
  64         lua_pushcclosure(L, detail::create_class::stage1, 0);
  65         lua_settable(L, LUA_GLOBALSINDEX);
  66
  67         bind_class_info(L);
  68     }
  69
  70 } // namespace luabind
  71