src/create_class.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 #define LUABIND_BUILDING
  26
  27 #include <luabind/luabind.hpp>
  28
  29 using namespace luabind::detail;
  30
  31 int luabind::detail::create_class::stage2(lua_State* L)
  32 {
  33         class_rep* crep = static_cast<class_rep*>(lua_touserdata(L, lua_upvalueindex(1)));
  34         assert((crep != 0) && "internal error, please report");
  35         assert((is_class_rep(L, lua_upvalueindex(1))) && "internal error, please report");
  36
  37 #ifndef LUABIND_NO_ERROR_CHECKING
  38
  39         if (!is_class_rep(L, 1))
  40         {
  41                 lua_pushstring(L, "expected class to derive from or a newline");
  42                 lua_error(L);
  43         }
  44
  45 #endif
  46
  47         class_rep* base = static_cast<class_rep*>(lua_touserdata(L, 1));
  48         class_rep::base_info binfo;
  49
  50         binfo.pointer_offset = 0;
  51         binfo.base = base;
  52         crep->add_base_class(binfo);
  53
  54         // this has changed, c++ classes now stores their
  55         // methods in the table as well
  56 //      if (base->get_class_type() == class_rep::lua_class)
  57         {
  58                 // copy base class members
  59
  60                 detail::getref(L, crep->table_ref());
  61                 detail::getref(L, base->table_ref());
  62                 lua_pushnil(L);
  63
  64                 while (lua_next(L, -2))
  65                 {
  66                         lua_pushstring(L, "__init");
  67                         if (lua_equal(L, -1, -3))
  68                         {
  69                                 lua_pop(L, 2);
  70                                 continue;
  71                         }
  72          else lua_pop(L, 1); // string
  73
  74                         lua_pushstring(L, "__finalize");
  75                         if (lua_equal(L, -1, -3))
  76                         {
  77                                 lua_pop(L, 2);
  78                                 continue;
  79          }
  80          else lua_pop(L, 1); // string
  81
  82                         lua_pushvalue(L, -2); // copy key
  83                         lua_insert(L, -2);
  84                         lua_settable(L, -5);
  85                 }
  86         }
  87
  88         crep->set_type(base->type());
  89
  90         return 0;
  91 }
  92
  93 int luabind::detail::create_class::stage1(lua_State* L)
  94 {
  95
  96 #ifndef LUABIND_NO_ERROR_CHECKING
  97
  98         if (lua_gettop(L) != 1 || lua_type(L, 1) != LUA_TSTRING || lua_isnumber(L, 1))
  99         {
 100                 lua_pushstring(L, "invalid construct, expected class name");
 101                 lua_error(L);
 102         }
 103
 104 #endif
 105
 106         const char* name = lua_tostring(L, 1);
 107
 108         void* c = lua_newuserdata(L, sizeof(class_rep));
 109         new(c) class_rep(L, name);
 110
 111         // make the class globally available
 112         lua_pushstring(L, name);
 113         lua_pushvalue(L, -2);
 114         lua_settable(L, LUA_GLOBALSINDEX);
 115
 116         // also add it to the closure as return value
 117         lua_pushcclosure(L, &stage2, 1);
 118
 119         return 1;
 120 }
 121