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/pcall.hpp>
  32 #include <luabind/error.hpp>
  33
  34 namespace luabind
  35 {
  36         namespace detail
  37         {
  38
  39
  40
  41
  42                 // if the proxy_member_caller returns non-void
  43                         template<class Ret, class Tuple>
  44                         class proxy_member_caller
  45                         {
  46 //                      friend class luabind::object;
  47                         public:
  48
  49                                 proxy_member_caller(luabind::object const* o, const char* name, const Tuple args)
  50                                         : m_obj(o)
  51                                         , m_member_name(name)
  52                                         , m_args(args)
  53                                         , m_called(false)
  54                                 {
  55                                 }
  56
  57                                 proxy_member_caller(const proxy_member_caller& rhs)
  58                                         : m_obj(rhs.m_obj)
  59                                         , m_member_name(rhs.m_member_name)
  60                                         , m_args(rhs.m_args)
  61                                         , m_called(rhs.m_called)
  62                                 {
  63                                         rhs.m_called = true;
  64                                 }
  65
  66                                 ~proxy_member_caller()
  67                                 {
  68                                         if (m_called) return;
  69
  70                                         m_called = true;
  71                                         lua_State* L = m_obj->lua_state();
  72                                         detail::stack_pop(L, 1); // pop the self reference
  73
  74                                         // get the function
  75                                         m_obj->pushvalue();
  76                                         lua_pushstring(L, m_member_name);
  77                                         lua_gettable(L, -2);
  78
  79                                         // push the self-object
  80                                         m_obj->pushvalue();
  81
  82                                         push_args_from_tuple<1>::apply(L, m_args);
  83                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
  84                                         {
  85 #ifndef LUABIND_NO_EXCEPTIONS
  86                                                 throw luabind::error(L);
  87 #else
  88                                                 error_callback_fun e = get_error_callback();
  89                                                 if (e) e(L);
  90
  91                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
  92                                                                 "If you want to handle this error use luabind::set_error_callback()");
  93                                                 std::terminate();
  94 #endif
  95                                         }
  96                                 }
  97
  98                                 operator Ret()
  99                                 {
 100                                         typename default_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
 101
 102                                         m_called = true;
 103                                         lua_State* L = m_obj->lua_state();
 104                                         detail::stack_pop p(L, 2); // pop the return value and the self reference
 105
 106                                         // get the function
 107                                         m_obj->pushvalue();
 108                                         lua_pushstring(L, m_member_name);
 109                                         lua_gettable(L, -2);
 110
 111                                         // push the self-object
 112                                         m_obj->pushvalue();
 113
 114                                         push_args_from_tuple<1>::apply(L, m_args);
 115                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 116                                         {
 117 #ifndef LUABIND_NO_EXCEPTIONS
 118                                                 throw luabind::error(L);
 119 #else
 120                                                 error_callback_fun e = get_error_callback();
 121                                                 if (e) e(L);
 122
 123                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 124                                                         "If you want to handle this error use luabind::set_error_callback()");
 125                                                 std::terminate();
 126 #endif
 127                                         }
 128
 129 #ifndef LUABIND_NO_ERROR_CHECKING
 130
 131                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 132                                         {
 133 #ifndef LUABIND_NO_EXCEPTIONS
 134                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 135 #else
 136                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 137                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 138
 139                                                 assert(0 && "the lua function's return value could not be converted."
 140                                                         "If you want to handle this error use luabind::set_error_callback()");
 141                                                 std::terminate();
 142 #endif
 143                                         }
 144 #endif
 145                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 146                                 }
 147
 148                                 template<class Policies>
 149                                 Ret operator[](const Policies& p)
 150                                 {
 151                                         typedef typename find_conversion_policy<0, Policies>::type converter_policy;
 152                                         typename converter_policy::template generate_converter<Ret, lua_to_cpp>::type converter;
 153
 154                                         m_called = true;
 155                                         lua_State* L = m_obj->lua_state();
 156                                         detail::stack_pop popper(L, 2); // pop the return value and the self reference
 157
 158                                         // get the function
 159                                         m_obj->pushvalue();
 160                                         lua_pushstring(L, m_member_name);
 161                                         lua_gettable(L, -2);
 162
 163                                         // push the self-object
 164                                         m_obj->pushvalue();
 165
 166                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 167                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 168                                         {
 169 #ifndef LUABIND_NO_EXCEPTIONS
 170                                                 throw error(L);
 171 #else
 172                                                 error_callback_fun e = get_error_callback();
 173                                                 if (e) e(L);
 174
 175                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 176                                                         "If you want to handle this error use luabind::set_error_callback()");
 177                                                 std::terminate();
 178 #endif
 179                                         }
 180
 181 #ifndef LUABIND_NO_ERROR_CHECKING
 182
 183                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 184                                         {
 185 #ifndef LUABIND_NO_EXCEPTIONS
 186                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 187 #else
 188                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 189                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 190
 191                                                 assert(0 && "the lua function's return value could not be converted."
 192                                                         "If you want to handle this error use luabind::set_error_callback()");
 193                                                 std::terminate();
 194 #endif
 195                                         }
 196 #endif
 197                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 198                                 }
 199
 200                         private:
 201
 202                                 luabind::object const* m_obj;
 203                                 const char* m_member_name;
 204                                 Tuple m_args;
 205                                 mutable bool m_called;
 206
 207                         };
 208
 209                 // if the proxy_member_caller returns void
 210                         template<class Tuple>
 211                         class proxy_member_void_caller
 212                         {
 213                         friend class luabind::object;
 214                         public:
 215
 216                                 proxy_member_void_caller(luabind::object const* o, const char* name, const Tuple args)
 217                                         : m_obj(o)
 218                                         , m_member_name(name)
 219                                         , m_args(args)
 220                                         , m_called(false)
 221                                 {
 222                                 }
 223
 224                                 proxy_member_void_caller(const proxy_member_void_caller& rhs)
 225                                         : m_obj(rhs.m_obj)
 226                                         , m_member_name(rhs.m_member_name)
 227                                         , m_args(rhs.m_args)
 228                                         , m_called(rhs.m_called)
 229                                 {
 230                                         rhs.m_called = true;
 231                                 }
 232
 233                                 ~proxy_member_void_caller()
 234                                 {
 235                                         if (m_called) return;
 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                                         push_args_from_tuple<1>::apply(L, m_args);
 250                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 251                                         {
 252 #ifndef LUABIND_NO_EXCEPTIONS
 253                                                 throw luabind::error(L);
 254 #else
 255                                                 error_callback_fun e = get_error_callback();
 256                                                 if (e) e(L);
 257
 258                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 259                                                         "If you want to handle this error use luabind::set_error_callback()");
 260                                                 std::terminate();
 261 #endif
 262                                         }
 263                                 }
 264
 265                                 template<class Policies>
 266                                 void operator[](const Policies& p)
 267                                 {
 268                                         m_called = true;
 269                                         lua_State* L = m_obj->lua_state();
 270                                         detail::stack_pop(L, 1); // pop the self reference
 271
 272                                         // get the function
 273                                         m_obj->pushvalue();
 274                                         lua_pushstring(L, m_member_name);
 275                                         lua_gettable(L, -2);
 276
 277                                         // push the self-object
 278                                         m_obj->pushvalue();
 279
 280
 281                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 282                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 283                                         {
 284 #ifndef LUABIND_NO_EXCEPTIONS
 285                                                 throw error(L);
 286 #else
 287                                                 error_callback_fun e = get_error_callback();
 288                                                 if (e) e(L);
 289
 290                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 291                                                         "If you want to handle this error use luabind::set_error_callback()");
 292                                                 std::terminate();
 293 #endif
 294                                         }
 295                                 }
 296
 297                         private:
 298
 299                                 luabind::object const* m_obj;
 300                                 const char* m_member_name;
 301                                 Tuple m_args;
 302                                 mutable bool m_called;
 303
 304                         };
 305
 306
 307         } // detail
 308
 309         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
 310         #include BOOST_PP_ITERATE()
 311
 312 }
 313
 314 #endif // LUABIND_CALL_MEMBER_HPP_INCLUDED
 315
 316 #else
 317
 318 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 319 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 320
 321         template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 322         typename boost::mpl::if_<boost::is_void<R>
 323                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 324                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 325         call_member(luabind::object const& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
 326         {
 327                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 328 #if BOOST_PP_ITERATION() == 0
 329                 tuple_t args;
 330 #else
 331                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 332 #endif
 333
 334                 typedef typename boost::mpl::if_<boost::is_void<R>
 335                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 336                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 337
 338                 return proxy_type(&obj, name, args);
 339         }
 340
 341 #undef LUABIND_OPERATOR_PARAMS
 342 #undef LUABIND_TUPLE_PARAMS
 343
 344 #endif