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 #include <luabind/luabind.hpp>
  26
  27 using namespace luabind::detail;
  28
  29 int luabind::detail::create_class::stage2(lua_State* L)
  30 {
  31         class_rep* crep = static_cast<class_rep*>(lua_touserdata(L, lua_upvalueindex(1)));
  32         assert((crep != 0) && "internal error, please report");
  33         assert((is_class_rep(L, lua_upvalueindex(1))) && "internal error, please report");
  34
  35 #ifndef LUABIND_NO_ERROR_CHECKING
  36
  37         if (!is_class_rep(L, 1))
  38         {
  39                 lua_pushstring(L, "expected class to derive from or a newline");
  40                 lua_error(L);
  41         }
  42
  43 #endif
  44
  45         class_rep* base = static_cast<class_rep*>(lua_touserdata(L, 1));
  46         class_rep::base_info binfo;
  47
  48         binfo.pointer_offset = 0;
  49         binfo.base = base;
  50         crep->add_base_class(binfo);
  51
  52         // set holder size and alignment so that we can class_rep::allocate
  53         // can return the correctly sized buffers
  54         crep->derived_from(base);
  55
  56         // this has changed, c++ classes now stores their
  57         // methods in the table as well
  58 //      if (base->get_class_type() == class_rep::lua_class)
  59         {
  60                 // copy base class members
  61
  62                 detail::getref(L, crep->table_ref());
  63                 detail::getref(L, base->table_ref());
  64                 lua_pushnil(L);
  65
  66                 while (lua_next(L, -2))
  67                 {
  68                         lua_pushstring(L, "__init");
  69                         if (lua_equal(L, -1, -3))
  70                         {
  71                                 lua_pop(L, 2);
  72                                 continue;
  73                         }
  74          else lua_pop(L, 1); // string
  75
  76                         lua_pushstring(L, "__finalize");
  77                         if (lua_equal(L, -1, -3))
  78                         {
  79                                 lua_pop(L, 2);
  80                                 continue;
  81          }
  82          else lua_pop(L, 1); // string
  83
  84                         lua_pushvalue(L, -2); // copy key
  85                         lua_insert(L, -2);
  86                         lua_settable(L, -5);
  87                 }
  88         }
  89
  90         crep->set_type(base->type());
  91
  92         return 0;
  93 }
  94
  95 int luabind::detail::create_class::stage1(lua_State* L)
  96 {
  97
  98 #ifndef LUABIND_NO_ERROR_CHECKING
  99
 100         if (lua_gettop(L) != 1 || lua_type(L, 1) != LUA_TSTRING || lua_isnumber(L, 1))
 101         {
 102                 lua_pushstring(L, "invalid construct, expected class name");
 103                 lua_error(L);
 104         }
 105
 106         if (std::strlen(lua_tostring(L, 1)) != lua_strlen(L, 1))
 107         {
 108                 lua_pushstring(L, "luabind does not support class names with extra nulls");
 109                 lua_error(L);
 110         }
 111
 112 #endif
 113
 114         const char* name = lua_tostring(L, 1);
 115
 116         void* c = lua_newuserdata(L, sizeof(class_rep));
 117         new(c) class_rep(L, name);
 118
 119         // make the class globally available
 120         lua_pushstring(L, name);
 121         lua_pushvalue(L, -2);
 122         lua_settable(L, LUA_GLOBALSINDEX);
 123
 124         // also add it to the closure as return value
 125         lua_pushcclosure(L, &stage2, 1);
 126
 127         return 1;
 128 }
 129