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/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(L);
  86 #else
  87                                                 error_callback_fun e = detail::error_callback::get().err;
  88                                                 if (e) e(L);
  89
  90                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
  91                                                                 "If you want to handle this error use luabind::set_error_callback()");
  92                                                 std::terminate();
  93 #endif
  94                                         }
  95                                 }
  96
  97                                 operator Ret()
  98                                 {
  99                                         typename default_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
 100
 101                                         m_called = true;
 102                                         lua_State* L = m_obj->lua_state();
 103                                         detail::stack_pop p(L, 2); // pop the return value and the self reference
 104
 105                                         // get the function
 106                                         m_obj->pushvalue();
 107                                         lua_pushstring(L, m_member_name);
 108                                         lua_gettable(L, -2);
 109
 110                                         // push the self-object
 111                                         m_obj->pushvalue();
 112
 113                                         push_args_from_tuple<1>::apply(L, m_args);
 114                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 1, 0))
 115                                         {
 116 #ifndef LUABIND_NO_EXCEPTIONS
 117                                                 throw luabind::error(L);
 118 #else
 119                                                 error_callback_fun e = detail::error_callback::get().err;
 120                                                 if (e) e(L);
 121
 122                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 123                                                         "If you want to handle this error use luabind::set_error_callback()");
 124                                                 std::terminate();
 125 #endif
 126                                         }
 127
 128 #ifndef LUABIND_NO_ERROR_CHECKING
 129
 130                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 131                                         {
 132 #ifndef LUABIND_NO_EXCEPTIONS
 133                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 134 #else
 135                                                 cast_failed_callback_fun e = detail::error_callback::get().cast;
 136                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 137
 138                                                 assert(0 && "the lua function's return value could not be converted."
 139                                                         "If you want to handle this error use luabind::set_error_callback()");
 140                                                 std::terminate();
 141 #endif
 142                                         }
 143 #endif
 144                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 145                                 }
 146
 147                                 template<class Policies>
 148                                 Ret operator[](const Policies& p)
 149                                 {
 150                                         typedef typename find_conversion_policy<0, Policies>::type converter_policy;
 151                                         typename converter_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
 152
 153                                         m_called = true;
 154                                         lua_State* L = m_obj->lua_state();
 155                                         detail::stack_pop popper(L, 2); // pop the return value and the self reference
 156
 157                                         // get the function
 158                                         m_obj->pushvalue();
 159                                         lua_pushstring(L, m_member_name);
 160                                         lua_gettable(L, -2);
 161
 162                                         // push the self-object
 163                                         m_obj->pushvalue();
 164
 165                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 166                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 1, 0))
 167                                         {
 168 #ifndef LUABIND_NO_EXCEPTIONS
 169                                                 throw error(L);
 170 #else
 171                                                 error_callback_fun e = detail::error_callback::get().err;
 172                                                 if (e) e(L);
 173
 174                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 175                                                         "If you want to handle this error use luabind::set_error_callback()");
 176                                                 std::terminate();
 177 #endif
 178                                         }
 179
 180 #ifndef LUABIND_NO_ERROR_CHECKING
 181
 182                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 183                                         {
 184 #ifndef LUABIND_NO_EXCEPTIONS
 185                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 186 #else
 187                                                 cast_failed_callback_fun e = detail::error_callback::get().cast;
 188                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 189
 190                                                 assert(0 && "the lua function's return value could not be converted."
 191                                                         "If you want to handle this error use luabind::set_error_callback()");
 192                                                 std::terminate();
 193 #endif
 194                                         }
 195 #endif
 196                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 197                                 }
 198
 199                         private:
 200
 201                                 luabind::object* m_obj;
 202                                 const char* m_member_name;
 203                                 Tuple m_args;
 204                                 mutable bool m_called;
 205
 206                         };
 207
 208                 // if the proxy_member_caller returns void
 209                         template<class Tuple>
 210                         class proxy_member_void_caller
 211                         {
 212                         friend class luabind::object;
 213                         public:
 214
 215                                 proxy_member_void_caller(luabind::object* o, const char* name, const Tuple args)
 216                                         : m_obj(o)
 217                                         , m_member_name(name)
 218                                         , m_args(args)
 219                                         , m_called(false)
 220                                 {
 221                                 }
 222
 223                                 proxy_member_void_caller(const proxy_member_void_caller& rhs)
 224                                         : m_obj(rhs.m_obj)
 225                                         , m_member_name(rhs.m_member_name)
 226                                         , m_args(rhs.m_args)
 227                                         , m_called(rhs.m_called)
 228                                 {
 229                                         rhs.m_called = true;
 230                                 }
 231
 232                                 ~proxy_member_void_caller()
 233                                 {
 234                                         if (m_called) return;
 235
 236                                         m_called = true;
 237                                         lua_State* L = m_obj->lua_state();
 238                                         detail::stack_pop(L, 1); // pop the self reference
 239
 240                                         // get the function
 241                                         m_obj->pushvalue();
 242                                         lua_pushstring(L, m_member_name);
 243                                         lua_gettable(L, -2);
 244
 245                                         // push the self-object
 246                                         m_obj->pushvalue();
 247
 248                                         push_args_from_tuple<1>::apply(L, m_args);
 249                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 0, 0))
 250                                         {
 251 #ifndef LUABIND_NO_EXCEPTIONS
 252                                                 throw luabind::error(L);
 253 #else
 254                                                 error_callback_fun e = detail::error_callback::get().err;
 255                                                 if (e) e(L);
 256
 257                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 258                                                         "If you want to handle this error use luabind::set_error_callback()");
 259                                                 std::terminate();
 260 #endif
 261                                         }
 262                                 }
 263
 264                                 template<class Policies>
 265                                 void operator[](const Policies& p)
 266                                 {
 267                                         m_called = true;
 268                                         lua_State* L = m_obj->lua_state();
 269                                         detail::stack_pop(L, 1); // pop the self reference
 270
 271                                         // get the function
 272                                         m_obj->pushvalue();
 273                                         lua_pushstring(L, m_member_name);
 274                                         lua_gettable(L, -2);
 275
 276                                         // push the self-object
 277                                         m_obj->pushvalue();
 278
 279
 280                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 281                                         if (lua_pcall(L, boost::tuples::length<Tuple>::value + 1, 0, 0))
 282                                         {
 283 #ifndef LUABIND_NO_EXCEPTIONS
 284                                                 throw error(L);
 285 #else
 286                                                 error_callback_fun e = detail::error_callback::get().err;
 287                                                 if (e) e(L);
 288
 289                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 290                                                         "If you want to handle this error use luabind::set_error_callback()");
 291                                                 std::terminate();
 292 #endif
 293                                         }
 294                                 }
 295
 296                         private:
 297
 298                                 luabind::object* m_obj;
 299                                 const char* m_member_name;
 300                                 Tuple m_args;
 301                                 mutable bool m_called;
 302
 303                         };
 304
 305
 306         } // detail
 307
 308         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
 309         #include BOOST_PP_ITERATE()
 310
 311 }
 312
 313 #endif // LUABIND_CALL_MEMBER_HPP_INCLUDED
 314
 315 #else
 316
 317 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 318 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 319
 320         template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 321         typename boost::mpl::if_<boost::is_void<R>
 322                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 323                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 324         call_member(luabind::object& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
 325         {
 326                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 327 #if BOOST_PP_ITERATION() == 0
 328                 tuple_t args;
 329 #else
 330                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 331 #endif
 332
 333                 typedef typename boost::mpl::if_<boost::is_void<R>
 334                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 335                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 336
 337                 return proxy_type(const_cast<luabind::object*>(&obj), name, args);
 338         }
 339
 340 #undef LUABIND_OPERATOR_PARAMS
 341 #undef LUABIND_TUPLE_PARAMS
 342
 343 #endif