include/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 #include <luabind/detail/stack_utils.hpp>
  34 #include <luabind/object.hpp> // TODO: REMOVE DEPENDENCY
  35
  36 #include <boost/tuple/tuple.hpp>
  37
  38 #include <boost/preprocessor/control/if.hpp>
  39 #include <boost/preprocessor/facilities/expand.hpp>
  40
  41 #include <boost/mpl/apply_wrap.hpp>
  42
  43 namespace luabind
  44 {
  45         namespace detail
  46         {
  47
  48                 namespace mpl = boost::mpl;
  49
  50                 // if the proxy_member_caller returns non-void
  51                         template<class Ret, class Tuple>
  52                         class proxy_member_caller
  53                         {
  54 //                      friend class luabind::object;
  55                         public:
  56
  57                                 proxy_member_caller(lua_State* L_, const Tuple args)
  58                                         : L(L_)
  59                                         , m_args(args)
  60                                         , m_called(false)
  61                                 {
  62                                 }
  63
  64                                 proxy_member_caller(const proxy_member_caller& rhs)
  65                                         : L(rhs.L)
  66                                         , m_args(rhs.m_args)
  67                                         , m_called(rhs.m_called)
  68                                 {
  69                                         rhs.m_called = true;
  70                                 }
  71
  72                                 ~proxy_member_caller()
  73                                 {
  74                                         if (m_called) return;
  75
  76                                         m_called = true;
  77
  78                                         // don't count the function and self-reference
  79                                         // since those will be popped by pcall
  80                                         int top = lua_gettop(L) - 2;
  81
  82                                         // pcall will pop the function and self reference
  83                                         // and all the parameters
  84
  85                                         push_args_from_tuple<1>::apply(L, m_args);
  86                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
  87                                         {
  88                                                 assert(lua_gettop(L) == top + 1);
  89 #ifndef LUABIND_NO_EXCEPTIONS
  90                                                 throw luabind::error(L);
  91 #else
  92                                                 error_callback_fun e = get_error_callback();
  93                                                 if (e) e(L);
  94
  95                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
  96                                                                 "If you want to handle this error use luabind::set_error_callback()");
  97                                                 std::terminate();
  98 #endif
  99                                         }
 100                                         // pops the return values from the function
 101                                         stack_pop pop(L, lua_gettop(L) - top);
 102                                 }
 103
 104                                 operator Ret()
 105                                 {
 106                                         typename mpl::apply_wrap2<default_policy,Ret,lua_to_cpp>::type converter;
 107
 108                                         m_called = true;
 109
 110                                         // don't count the function and self-reference
 111                                         // since those will be popped by pcall
 112                                         int top = lua_gettop(L) - 2;
 113
 114                                         // pcall will pop the function and self reference
 115                                         // and all the parameters
 116                                         push_args_from_tuple<1>::apply(L, m_args);
 117                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 118                                         {
 119                                                 assert(lua_gettop(L) == top + 1);
 120 #ifndef LUABIND_NO_EXCEPTIONS
 121                                                 throw luabind::error(L);
 122 #else
 123                                                 error_callback_fun e = get_error_callback();
 124                                                 if (e) e(L);
 125
 126                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 127                                                         "If you want to handle this error use luabind::set_error_callback()");
 128                                                 std::terminate();
 129 #endif
 130                                         }
 131
 132                                         // pops the return values from the function
 133                                         stack_pop pop(L, lua_gettop(L) - top);
 134
 135 #ifndef LUABIND_NO_ERROR_CHECKING
 136
 137                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 138                                         {
 139                                                 assert(lua_gettop(L) == top + 1);
 140 #ifndef LUABIND_NO_EXCEPTIONS
 141                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 142 #else
 143                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 144                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 145
 146                                                 assert(0 && "the lua function's return value could not be converted."
 147                                                         "If you want to handle this error use luabind::set_error_callback()");
 148                                                 std::terminate();
 149 #endif
 150                                         }
 151 #endif
 152                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 153                                 }
 154
 155                                 template<class Policies>
 156                                 Ret operator[](const Policies& p)
 157                                 {
 158                                         typedef typename find_conversion_policy<0, Policies>::type converter_policy;
 159                                         typename mpl::apply_wrap2<converter_policy,Ret,lua_to_cpp>::type converter;
 160
 161                                         m_called = true;
 162
 163                                         // don't count the function and self-reference
 164                                         // since those will be popped by pcall
 165                                         int top = lua_gettop(L) - 2;
 166
 167                                         // pcall will pop the function and self reference
 168                                         // and all the parameters
 169
 170                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 171                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 172                                         {
 173                                                 assert(lua_gettop(L) == top + 1);
 174 #ifndef LUABIND_NO_EXCEPTIONS
 175                                                 throw error(L);
 176 #else
 177                                                 error_callback_fun e = get_error_callback();
 178                                                 if (e) e(L);
 179
 180                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 181                                                         "If you want to handle this error use luabind::set_error_callback()");
 182                                                 std::terminate();
 183 #endif
 184                                         }
 185
 186                                         // pops the return values from the function
 187                                         stack_pop pop(L, lua_gettop(L) - top);
 188
 189 #ifndef LUABIND_NO_ERROR_CHECKING
 190
 191                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 192                                         {
 193                                                 assert(lua_gettop(L) == top + 1);
 194 #ifndef LUABIND_NO_EXCEPTIONS
 195                                                 throw cast_failed(L, LUABIND_TYPEID(Ret));
 196 #else
 197                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 198                                                 if (e) e(L, LUABIND_TYPEID(Ret));
 199
 200                                                 assert(0 && "the lua function's return value could not be converted."
 201                                                         "If you want to handle this error use luabind::set_error_callback()");
 202                                                 std::terminate();
 203 #endif
 204                                         }
 205 #endif
 206                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 207                                 }
 208
 209                         private:
 210
 211                                 lua_State* L;
 212                                 Tuple m_args;
 213                                 mutable bool m_called;
 214
 215                         };
 216
 217                 // if the proxy_member_caller returns void
 218                         template<class Tuple>
 219                         class proxy_member_void_caller
 220                         {
 221                         friend class luabind::object;
 222                         public:
 223
 224                                 proxy_member_void_caller(lua_State* L_, const Tuple args)
 225                                         : L(L_)
 226                                         , m_args(args)
 227                                         , m_called(false)
 228                                 {
 229                                 }
 230
 231                                 proxy_member_void_caller(const proxy_member_void_caller& rhs)
 232                                         : L(rhs.L)
 233                                         , m_args(rhs.m_args)
 234                                         , m_called(rhs.m_called)
 235                                 {
 236                                         rhs.m_called = true;
 237                                 }
 238
 239                                 ~proxy_member_void_caller()
 240                                 {
 241                                         if (m_called) return;
 242
 243                                         m_called = true;
 244
 245                                         // don't count the function and self-reference
 246                                         // since those will be popped by pcall
 247                                         int top = lua_gettop(L) - 2;
 248
 249                                         // pcall will pop the function and self reference
 250                                         // and all the parameters
 251
 252                                         push_args_from_tuple<1>::apply(L, m_args);
 253                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 254                                         {
 255                                                 assert(lua_gettop(L) == top + 1);
 256 #ifndef LUABIND_NO_EXCEPTIONS
 257                                                 throw luabind::error(L);
 258 #else
 259                                                 error_callback_fun e = get_error_callback();
 260                                                 if (e) e(L);
 261
 262                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 263                                                         "If you want to handle this error use luabind::set_error_callback()");
 264                                                 std::terminate();
 265 #endif
 266                                         }
 267                                         // pops the return values from the function
 268                                         stack_pop pop(L, lua_gettop(L) - top);
 269                                 }
 270
 271                                 template<class Policies>
 272                                 void operator[](const Policies& p)
 273                                 {
 274                                         m_called = true;
 275
 276                                         // don't count the function and self-reference
 277                                         // since those will be popped by pcall
 278                                         int top = lua_gettop(L) - 2;
 279
 280                                         // pcall will pop the function and self reference
 281                                         // and all the parameters
 282
 283                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 284                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 285                                         {
 286                                                 assert(lua_gettop(L) == top + 1);
 287 #ifndef LUABIND_NO_EXCEPTIONS
 288                                                 throw error(L);
 289 #else
 290                                                 error_callback_fun e = get_error_callback();
 291                                                 if (e) e(L);
 292
 293                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 294                                                         "If you want to handle this error use luabind::set_error_callback()");
 295                                                 std::terminate();
 296 #endif
 297                                         }
 298                                         // pops the return values from the function
 299                                         stack_pop pop(L, lua_gettop(L) - top);
 300                                 }
 301
 302                         private:
 303                                 lua_State* L;
 304                                 Tuple m_args;
 305                                 mutable bool m_called;
 306
 307                         };
 308
 309         } // detail
 310
 311         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
 312         #include BOOST_PP_ITERATE()
 313
 314 }
 315
 316 #endif // LUABIND_CALL_MEMBER_HPP_INCLUDED
 317
 318 #elif BOOST_PP_ITERATION_FLAGS() == 1
 319
 320 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 321 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 322
 323         template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 324         typename boost::mpl::if_<boost::is_void<R>
 325                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 326                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 327         call_member(object const& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
 328         {
 329                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 330 #if BOOST_PP_ITERATION() == 0
 331                 tuple_t args;
 332 #else
 333                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 334 #endif
 335
 336                 typedef typename boost::mpl::if_<boost::is_void<R>
 337                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 338                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 339
 340                 // this will be cleaned up by the proxy object
 341                 // once the call has been made
 342
 343                 // get the function
 344                 obj.push(obj.interpreter());
 345                 lua_pushstring(obj.interpreter(), name);
 346                 lua_gettable(obj.interpreter(), -2);
 347                 // duplicate the self-object
 348                 lua_pushvalue(obj.interpreter(), -2);
 349                 // remove the bottom self-object
 350                 lua_remove(obj.interpreter(), -3);
 351
 352                 // now the function and self objects
 353                 // are on the stack. These will both
 354                 // be popped by pcall
 355                 return proxy_type(obj.interpreter(), args);
 356         }
 357
 358 #undef LUABIND_OPERATOR_PARAMS
 359 #undef LUABIND_TUPLE_PARAMS
 360
 361 #endif
 362