luabind/detail/call_member.hpp

   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
  24 #if !BOOST_PP_IS_ITERATING
  25
  26 #ifndef LUABIND_CALL_MEMBER_HPP_INCLUDED
  27 #define LUABIND_CALL_MEMBER_HPP_INCLUDED
  28
  29 #include <luabind/config.hpp>
  30 #include <luabind/detail/convert_to_lua.hpp>
  31 #include <luabind/detail/error.hpp>
  32
  33 namespace luabind
  34 {
  35         namespace detail
  36         {
  37
  38
  39
  40
  41                 // if the proxy_member_caller returns non-void
  42                         template<class Ret, class Tuple>
  43                         class proxy_member_caller
  44                         {
  45 //                      friend class luabind::object;
  46                         public:
  47
  48                                 proxy_member_caller(luabind::object* o, const char* name, const Tuple args)
  49                                         : m_obj(o)
  50                                         , m_member_name(name)
  51                                         , m_args(args)
  52                                         , m_called(false)
  53                                 {
  54                                 }
  55
  56                                 proxy_member_caller(const proxy_member_caller& rhs)
  57                                         : m_obj(rhs.m_obj)
  58                                         , m_member_name(rhs.m_member_name)
  59                                         , m_args(rhs.m_args)
  60                                         , m_called(rhs.m_called)
  61                                 {
  62                                         rhs.m_called = true;
  63                                 }
  64
  65                                 ~proxy_member_caller()
  66                                 {
  67                                         if (m_called) return;
  68
  69                                         m_called = true;
  70                                         lua_State* L = m_obj->lua_state();
  71                                         detail::stack_pop(L, 1); // pop the self reference
  72
  73                                         // get the function
  74                                         m_obj->pushvalue();
  75                                         lua_pushstring(L, m_member_name);
  76                                         lua_gettable(L, -2);
  77
  78                                         // push the self-object
  79                                         m_obj->pushvalue();
  80
  81                                         push_args_from_tuple<1>::apply(L, m_args);
  82                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 0, 0))
  83                                         {
  84 #ifndef LUABIND_NO_EXCEPTIONS
  85                                                 throw luabind::error();
  86 #else
  87                                                 assert(0);
  88 #endif
  89                                         }
  90                                 }
  91
  92                                 operator Ret()
  93                                 {
  94                                         typename default_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
  95
  96                                         m_called = true;
  97                                         lua_State* L = m_obj->lua_state();
  98                                         detail::stack_pop p(L, 2); // pop the return value and the self reference
  99
 100                                         // get the function
 101                                         m_obj->pushvalue();
 102                                         lua_pushstring(L, m_member_name);
 103                                         lua_gettable(L, -2);
 104
 105                                         // push the self-object
 106                                         m_obj->pushvalue();
 107
 108                                         push_args_from_tuple<1>::apply(L, m_args);
 109                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 1, 0))
 110                                         {
 111 #ifndef LUABIND_NO_EXCEPTIONS
 112                                                 throw luabind::error();
 113 #else
 114                                                 assert(0);
 115 #endif
 116                                         }
 117
 118 #ifndef LUABIND_NO_ERROR_CHECKING
 119 #ifndef LUABIND_NO_EXCEPTIONS
 120
 121                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 122                                         {
 123                                                 throw cant_convert_return_value();
 124                                         }
 125 #else
 126                                         assert(converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) >= 0);
 127 #endif
 128 #endif
 129                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 130                                 }
 131
 132                                 template<class Policies>
 133                                 Ret operator[](const Policies& p)
 134                                 {
 135                                         typedef typename find_conversion_policy<0, Policies>::type converter_policy;
 136                                         typename converter_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
 137
 138                                         m_called = true;
 139                                         lua_State* L = m_obj->lua_state();
 140                                         detail::stack_pop popper(L, 2); // pop the return value and the self reference
 141
 142                                         // get the function
 143                                         m_obj->pushvalue();
 144                                         lua_pushstring(L, m_member_name);
 145                                         lua_gettable(L, -2);
 146
 147                                         // push the self-object
 148                                         m_obj->pushvalue();
 149
 150                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 151                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 1, 0))
 152                                         {
 153 #ifndef LUABIND_NO_EXCEPTIONS
 154                                                 throw error();
 155 #else
 156                                                 assert(0);
 157 #endif
 158                                         }
 159
 160 #ifndef LUABIND_NO_ERROR_CHECKING
 161 #ifndef LUABIND_NO_EXCEPTIONS
 162
 163                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 164                                         {
 165                                                 throw cant_convert_return_value();
 166                                         }
 167 #else
 168                                         assert(converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) >= 0);
 169 #endif
 170 #endif
 171                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 172                                 }
 173
 174                         private:
 175
 176                                 luabind::object* m_obj;
 177                                 const char* m_member_name;
 178                                 Tuple m_args;
 179                                 mutable bool m_called;
 180
 181                         };
 182
 183                 // if the proxy_member_caller returns void
 184                         template<class Tuple>
 185                         class proxy_member_void_caller
 186                         {
 187                         friend class luabind::object;
 188                         public:
 189
 190                                 proxy_member_void_caller(luabind::object* o, const char* name, const Tuple args)
 191                                         : m_obj(o)
 192                                         , m_member_name(name)
 193                                         , m_args(args)
 194                                         , m_called(false)
 195                                 {
 196                                 }
 197
 198                                 proxy_member_void_caller(const proxy_member_void_caller& rhs)
 199                                         : m_obj(rhs.m_obj)
 200                                         , m_member_name(rhs.m_member_name)
 201                                         , m_args(rhs.m_args)
 202                                         , m_called(rhs.m_called)
 203                                 {
 204                                         rhs.m_called = true;
 205                                 }
 206
 207                                 ~proxy_member_void_caller()
 208                                 {
 209                                         if (m_called) return;
 210
 211                                         m_called = true;
 212                                         lua_State* L = m_obj->lua_state();
 213                                         detail::stack_pop(L, 1); // pop the self reference
 214
 215                                         // get the function
 216                                         m_obj->pushvalue();
 217                                         lua_pushstring(L, m_member_name);
 218                                         lua_gettable(L, -2);
 219
 220                                         // push the self-object
 221                                         m_obj->pushvalue();
 222
 223                                         push_args_from_tuple<1>::apply(L, m_args);
 224                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 0, 0))
 225                                         {
 226 #ifndef LUABIND_NO_EXCEPTIONS
 227                                                 throw luabind::error();
 228 #else
 229                                                 assert(0);
 230 #endif
 231                                         }
 232                                 }
 233
 234                                 template<class Policies>
 235                                 void operator[](const Policies& p)
 236                                 {
 237                                         m_called = true;
 238                                         lua_State* L = m_obj->lua_state();
 239                                         detail::stack_pop(L, 1); // pop the self reference
 240
 241                                         // get the function
 242                                         m_obj->pushvalue();
 243                                         lua_pushstring(L, m_member_name);
 244                                         lua_gettable(L, -2);
 245
 246                                         // push the self-object
 247                                         m_obj->pushvalue();
 248
 249
 250                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 251                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 0, 0))
 252                                         {
 253 #ifndef LUABIND_NO_EXCEPTIONS
 254                                                 throw error();
 255 #else
 256                                                 assert(0);
 257 #endif
 258                                         }
 259                                 }
 260
 261                         private:
 262
 263                                 luabind::object* m_obj;
 264                                 const char* m_member_name;
 265                                 Tuple m_args;
 266                                 mutable bool m_called;
 267
 268                         };
 269
 270
 271         } // detail
 272
 273         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
 274         #include BOOST_PP_ITERATE()
 275
 276 }
 277
 278 #endif // LUABIND_CALL_MEMBER_HPP_INCLUDED
 279
 280 #else
 281
 282 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 283 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 284
 285         template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 286         typename boost::mpl::if_<boost::is_void<R>
 287                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 288                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 289         call_member(luabind::object& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
 290         {
 291                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 292 #if BOOST_PP_ITERATION() == 0
 293                 tuple_t args;
 294 #else
 295                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 296 #endif
 297
 298                 typedef typename boost::mpl::if_<boost::is_void<R>
 299                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 300                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 301
 302                 return proxy_type(const_cast<luabind::object*>(&obj), name, args);
 303         }
 304
 305 #undef LUABIND_OPERATOR_PARAMS
 306 #undef LUABIND_TUPLE_PARAMS
 307
 308 #endif