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         // set holder size and alignment so that we can class_rep::allocate
  55         // can return the correctly sized buffers
  56         crep->derived_from(base);
  57
  58         // this has changed, c++ classes now stores their
  59         // methods in the table as well
  60 //      if (base->get_class_type() == class_rep::lua_class)
  61         {
  62                 // copy base class members
  63
  64                 detail::getref(L, crep->table_ref());
  65                 detail::getref(L, base->table_ref());
  66                 lua_pushnil(L);
  67
  68                 while (lua_next(L, -2))
  69                 {
  70                         lua_pushstring(L, "__init");
  71                         if (lua_equal(L, -1, -3))
  72                         {
  73                                 lua_pop(L, 2);
  74                                 continue;
  75                         }
  76          else lua_pop(L, 1); // string
  77
  78                         lua_pushstring(L, "__finalize");
  79                         if (lua_equal(L, -1, -3))
  80                         {
  81                                 lua_pop(L, 2);
  82                                 continue;
  83          }
  84          else lua_pop(L, 1); // string
  85
  86                         lua_pushvalue(L, -2); // copy key
  87                         lua_insert(L, -2);
  88                         lua_settable(L, -5);
  89                 }
  90         }
  91
  92         crep->set_type(base->type());
  93
  94         return 0;
  95 }
  96
  97 int luabind::detail::create_class::stage1(lua_State* L)
  98 {
  99
 100 #ifndef LUABIND_NO_ERROR_CHECKING
 101
 102         if (lua_gettop(L) != 1 || lua_type(L, 1) != LUA_TSTRING || lua_isnumber(L, 1))
 103         {
 104                 lua_pushstring(L, "invalid construct, expected class name");
 105                 lua_error(L);
 106         }
 107
 108 #endif
 109
 110         const char* name = lua_tostring(L, 1);
 111
 112         void* c = lua_newuserdata(L, sizeof(class_rep));
 113         new(c) class_rep(L, name);
 114
 115         // make the class globally available
 116         lua_pushstring(L, name);
 117         lua_pushvalue(L, -2);
 118         lua_settable(L, LUA_GLOBALSINDEX);
 119
 120         // also add it to the closure as return value
 121         lua_pushcclosure(L, &stage2, 1);
 122
 123         return 1;
 124 }
 125