src/luabind/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 namespace
  31 {
  32
  33   int make_property(lua_State* L)
  34   {
  35       int args = lua_gettop(L);
  36
  37       if (args == 0 || args > 2)
  38       {
  39           lua_pushstring(L, "make_property() called with wrong number of arguments.");
  40           lua_error(L);
  41       }
  42
  43       if (args == 1)
  44           lua_pushnil(L);
  45
  46       lua_pushcclosure(L, &detail::property_tag, 2);
  47       return 1;
  48   }
  49
  50 } // namespace unnamed
  51
  52     void open(lua_State* L)
  53     {
  54         // get the global class registry, or create one if it doesn't exist
  55         // (it's global within a lua state)
  56         detail::class_registry* r = 0;
  57
  58         // If you hit this assert it's because you have called luabind::open()
  59         // twice on the same lua_State.
  60         assert((detail::class_registry::get_registry(L) == 0)
  61             && "you cannot call luabind::open() twice");
  62
  63         lua_pushstring(L, "__luabind_classes");
  64         r = static_cast<detail::class_registry*>(
  65             lua_newuserdata(L, sizeof(detail::class_registry)));
  66
  67         // set gc metatable
  68         lua_newtable(L);
  69         lua_pushstring(L, "__gc");
  70         lua_pushcclosure(
  71             L
  72           , detail::garbage_collector_s<
  73                 detail::class_registry
  74             >::apply
  75           , 0);
  76
  77         lua_settable(L, -3);
  78         lua_setmetatable(L, -2);
  79
  80         new(r) detail::class_registry(L);
  81         lua_settable(L, LUA_REGISTRYINDEX);
  82
  83         // add functions (class, cast etc...)
  84         lua_pushstring(L, "class");
  85         lua_pushcclosure(L, detail::create_class::stage1, 0);
  86         lua_settable(L, LUA_GLOBALSINDEX);
  87
  88         lua_pushstring(L, "property");
  89         lua_pushcclosure(L, &make_property, 0);
  90         lua_settable(L, LUA_GLOBALSINDEX);
  91     }
  92
  93 } // namespace luabind
  94