luabind/detail/call_function.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_FUNCTION_HPP_INCLUDED
  27 #define LUABIND_CALL_FUNCTION_HPP_INCLUDED
  28
  29 #include <luabind/config.hpp>
  30
  31 #include <boost/mpl/if.hpp>
  32 #include <boost/tuple/tuple.hpp>
  33 #include <boost/mpl/or.hpp>
  34 #include <boost/preprocessor/repeat.hpp>
  35 #include <boost/preprocessor/iteration/iterate.hpp>
  36 #include <boost/preprocessor/repetition/enum.hpp>
  37 #include <boost/preprocessor/repetition/enum_params.hpp>
  38 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  39 #include <boost/preprocessor/punctuation/comma_if.hpp>
  40
  41 #include <luabind/error.hpp>
  42 #include <luabind/detail/convert_to_lua.hpp>
  43 #include <luabind/detail/pcall.hpp>
  44
  45 namespace luabind
  46 {
  47         namespace detail
  48         {
  49
  50                 // if the proxy_function_caller returns non-void
  51                         template<class Ret, class Tuple>
  52                         class proxy_function_caller
  53                         {
  54 //                      friend class luabind::object;
  55                         public:
  56
  57                                 typedef int(*function_t)(lua_State*, int, int);
  58
  59                                 proxy_function_caller(
  60                                         lua_State* L
  61                                         , int params
  62                                         , function_t fun
  63                                         , const Tuple args)
  64                                         : m_state(L)
  65                                         , m_params(params)
  66                                         , m_fun(fun)
  67                                         , m_args(args)
  68                                         , m_called(false)
  69                                 {
  70                                 }
  71
  72                                 proxy_function_caller(const proxy_function_caller& rhs)
  73                                         : m_state(rhs.m_state)
  74                                         , m_params(rhs.m_params)
  75                                         , m_fun(rhs.m_fun)
  76                                         , m_args(rhs.m_args)
  77                                         , m_called(rhs.m_called)
  78                                 {
  79                                         rhs.m_called = true;
  80                                 }
  81
  82                                 ~proxy_function_caller()
  83                                 {
  84                                         if (m_called) return;
  85
  86                                         m_called = true;
  87                                         lua_State* L = m_state;
  88
  89                                         int top = lua_gettop(L);
  90
  91                                         push_args_from_tuple<1>::apply(L, m_args);
  92                                         if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
  93                                         {
  94                                                 assert(lua_gettop(L) == top - m_params + 1);
  95 #ifndef LUABIND_NO_EXCEPTIONS
  96                                                 throw luabind::error(L);
  97 #else
  98                                                 error_callback_fun e = get_error_callback();
  99                                                 if (e) e(L);
 100
 101                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 102                                                                         " If you want to handle the error you can use luabind::set_error_callback()");
 103                                                 std::terminate();
 104
 105 #endif
 106                                         }
 107
 108                                         // pops the return values from the function call
 109                                         stack_pop pop(L, lua_gettop(L) - top + m_params);
 110                                 }
 111
 112                                 operator Ret()
 113                                 {
 114                                         typename mpl::apply_wrap2<default_policy,Ret,lua_to_cpp>::type converter;
 115
 116                                         m_called = true;
 117                                         lua_State* L = m_state;
 118
 119                                         int top = lua_gettop(L);
 120
 121                                         push_args_from_tuple<1>::apply(L, m_args);
 122                                         if (m_fun(L, boost::tuples::length<Tuple>::value, 1))
 123                                         {
 124                                                 assert(lua_gettop(L) == top - m_params + 1);
 125 #ifndef LUABIND_NO_EXCEPTIONS
 126                                                 throw luabind::error(L);
 127 #else
 128                                                 error_callback_fun e = get_error_callback();
 129                                                 if (e) e(L);
 130
 131                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 132                                                                 " If you want to handle the error you can use luabind::set_error_callback()");
 133                                                 std::terminate();
 134 #endif
 135                                         }
 136
 137                                         // pops the return values from the function call
 138                                         stack_pop pop(L, lua_gettop(L) - top + m_params);
 139
 140 #ifndef LUABIND_NO_ERROR_CHECKING
 141
 142                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 143                                         {
 144 #ifndef LUABIND_NO_EXCEPTIONS
 145                                                 throw cast_failed(L, typeid(Ret));
 146 #else
 147                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 148                                                 if (e) e(L, typeid(Ret));
 149
 150                                                 assert(0 && "the lua function's return value could not be converted."
 151                                                                         " If you want to handle the error you can use luabind::set_error_callback()");
 152                                                 std::terminate();
 153
 154 #endif
 155                                         }
 156 #endif
 157                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 158                                 }
 159
 160                                 template<class Policies>
 161                                 Ret operator[](const Policies& p)
 162                                 {
 163                                         typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
 164                                         typename mpl::apply_wrap2<converter_policy,Ret,lua_to_cpp>::type converter;
 165
 166                                         m_called = true;
 167                                         lua_State* L = m_state;
 168
 169                                         int top = lua_gettop(L);
 170
 171                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 172                                         if (m_fun(L, boost::tuples::length<Tuple>::value, 1))
 173                                         {
 174                                                 assert(lua_gettop(L) == top - m_params + 1);
 175 #ifndef LUABIND_NO_EXCEPTIONS
 176                                                 throw error(L);
 177 #else
 178                                                 error_callback_fun e = get_error_callback();
 179                                                 if (e) e(L);
 180
 181                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 182                                                                 " If you want to handle the error you can use luabind::set_error_callback()");
 183                                                 std::terminate();
 184 #endif
 185                                         }
 186
 187                                         // pops the return values from the function call
 188                                         stack_pop pop(L, lua_gettop(L) - top + m_params);
 189
 190 #ifndef LUABIND_NO_ERROR_CHECKING
 191
 192                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 193                                         {
 194 #ifndef LUABIND_NO_EXCEPTIONS
 195                                                 throw cast_failed(L, typeid(Ret));
 196 #else
 197                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 198                                                 if (e) e(L, typeid(Ret));
 199
 200                                                 assert(0 && "the lua function's return value could not be converted."
 201                                                                         " If you want to handle the error you can use luabind::set_error_callback()");
 202                                                 std::terminate();
 203
 204 #endif
 205                                         }
 206 #endif
 207                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 208                                 }
 209
 210                         private:
 211
 212                                 lua_State* m_state;
 213                                 int m_params;
 214                                 function_t m_fun;
 215                                 Tuple m_args;
 216                                 mutable bool m_called;
 217
 218                         };
 219
 220                 // if the proxy_member_caller returns void
 221                         template<class Tuple>
 222                         class proxy_function_void_caller
 223                         {
 224                         friend class luabind::object;
 225                         public:
 226
 227                                 typedef int(*function_t)(lua_State*, int, int);
 228
 229                                 proxy_function_void_caller(
 230                                         lua_State* L
 231                                         , int params
 232                                         , function_t fun
 233                                         , const Tuple args)
 234                                         : m_state(L)
 235                                         , m_params(params)
 236                                         , m_fun(fun)
 237                                         , m_args(args)
 238                                         , m_called(false)
 239                                 {
 240                                 }
 241
 242                                 proxy_function_void_caller(const proxy_function_void_caller& rhs)
 243                                         : m_state(rhs.m_state)
 244                                         , m_params(rhs.m_params)
 245                                         , m_fun(rhs.m_fun)
 246                                         , m_args(rhs.m_args)
 247                                         , m_called(rhs.m_called)
 248                                 {
 249                                         rhs.m_called = true;
 250                                 }
 251
 252                                 ~proxy_function_void_caller()
 253                                 {
 254                                         if (m_called) return;
 255
 256                                         m_called = true;
 257                                         lua_State* L = m_state;
 258
 259                                         int top = lua_gettop(L);
 260
 261                                         push_args_from_tuple<1>::apply(L, m_args);
 262                                         if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
 263                                         {
 264                                                 assert(lua_gettop(L) == top - m_params + 1);
 265 #ifndef LUABIND_NO_EXCEPTIONS
 266                                                 throw luabind::error(L);
 267 #else
 268                                                 error_callback_fun e = get_error_callback();
 269                                                 if (e) e(L);
 270
 271                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 272                                                                 " If you want to handle the error you can use luabind::set_error_callback()");
 273                                                 std::terminate();
 274 #endif
 275                                         }
 276                                         // pops the return values from the function call
 277                                         stack_pop pop(L, lua_gettop(L) - top + m_params);
 278                                 }
 279
 280                                 template<class Policies>
 281                                 void operator[](const Policies& p)
 282                                 {
 283                                         m_called = true;
 284                                         lua_State* L = m_state;
 285
 286                                         int top = lua_gettop(L);
 287
 288                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 289                                         if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
 290                                         {
 291                                                 assert(lua_gettop(L) == top - m_params + 1);
 292 #ifndef LUABIND_NO_EXCEPTIONS
 293                                                 throw error(L);
 294 #else
 295                                                 error_callback_fun e = get_error_callback();
 296                                                 if (e) e(L);
 297
 298                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 299                                                         " If you want to handle the error you can use luabind::set_error_callback()");
 300                                                 std::terminate();
 301 #endif
 302                                         }
 303                                         // pops the return values from the function call
 304                                         stack_pop pop(L, lua_gettop(L) - top + m_params);
 305                                 }
 306
 307                         private:
 308
 309                                 lua_State* m_state;
 310                                 int m_params;
 311                                 function_t m_fun;
 312                                 Tuple m_args;
 313                                 mutable bool m_called;
 314
 315                         };
 316
 317         }
 318
 319         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_function.hpp>, 1))
 320         #include BOOST_PP_ITERATE()
 321
 322 }
 323
 324 #endif // LUABIND_CALL_FUNCTION_HPP_INCLUDED
 325
 326 #elif BOOST_PP_ITERATION_FLAGS() == 1
 327
 328 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 329 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 330
 331
 332         template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 333         typename boost::mpl::if_<boost::is_void<Ret>
 334                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 335                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 336         call_function(lua_State* L, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
 337         {
 338                 assert(name && "luabind::call_function() expects a function name");
 339                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 340 #if BOOST_PP_ITERATION() == 0
 341                 tuple_t args;
 342 #else
 343                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 344 #endif
 345                 typedef typename boost::mpl::if_<boost::is_void<Ret>
 346                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 347                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 348
 349                 lua_pushstring(L, name);
 350                 lua_gettable(L, LUA_GLOBALSINDEX);
 351
 352                 return proxy_type(L, 1, &detail::pcall, args);
 353         }
 354
 355         template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 356         typename boost::mpl::if_<boost::is_void<Ret>
 357                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 358                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 359         call_function(luabind::object const& obj BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
 360         {
 361                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 362 #if BOOST_PP_ITERATION() == 0
 363                 tuple_t args;
 364 #else
 365                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 366 #endif
 367                 typedef typename boost::mpl::if_<boost::is_void<Ret>
 368                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 369                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 370
 371                 obj.push(obj.interpreter());
 372                 return proxy_type(obj.interpreter(), 1, &detail::pcall, args);
 373         }
 374
 375         template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 376         typename boost::mpl::if_<boost::is_void<Ret>
 377                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 378                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 379         resume_function(lua_State* L, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
 380         {
 381                 assert(name && "luabind::resume_function() expects a function name");
 382                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 383 #if BOOST_PP_ITERATION() == 0
 384                 tuple_t args;
 385 #else
 386                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 387 #endif
 388                 typedef typename boost::mpl::if_<boost::is_void<Ret>
 389                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 390                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 391
 392                 lua_pushstring(L, name);
 393                 lua_gettable(L, LUA_GLOBALSINDEX);
 394
 395                 return proxy_type(L, 1, &detail::resume_impl, args);
 396         }
 397
 398         template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 399         typename boost::mpl::if_<boost::is_void<Ret>
 400                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 401                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 402         resume_function(luabind::object const& obj BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
 403         {
 404                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 405 #if BOOST_PP_ITERATION() == 0
 406                 tuple_t args;
 407 #else
 408                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 409 #endif
 410                 typedef typename boost::mpl::if_<boost::is_void<Ret>
 411                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 412                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 413
 414                 obj.push(obj.interpreter());
 415                 return proxy_type(obj.interpreter(), 1, &detail::resume_impl, args);
 416         }
 417
 418         template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 419         typename boost::mpl::if_<boost::is_void<Ret>
 420                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 421                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 422         resume(lua_State* L BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
 423         {
 424                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 425 #if BOOST_PP_ITERATION() == 0
 426                 tuple_t args;
 427 #else
 428                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 429 #endif
 430                 typedef typename boost::mpl::if_<boost::is_void<Ret>
 431                         , luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 432                         , luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 433
 434                 return proxy_type(L, 0, &detail::resume_impl, args);
 435         }
 436
 437
 438 #undef LUABIND_OPERATOR_PARAMS
 439 #undef LUABIND_TUPLE_PARAMS
 440
 441
 442 #endif
 443