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 #include <boost/preprocessor/repetition/enum.hpp>
  41
  42 #include <boost/mpl/apply_wrap.hpp>
  43
  44 namespace luabind
  45 {
  46         namespace detail
  47         {
  48
  49                 namespace mpl = boost::mpl;
  50
  51                 // if the proxy_member_caller returns non-void
  52                         template<class Ret, class Tuple>
  53                         class proxy_member_caller
  54                         {
  55 //                      friend class luabind::object;
  56                         public:
  57
  58                                 proxy_member_caller(lua_State* L_, const Tuple args)
  59                                         : L(L_)
  60                                         , m_args(args)
  61                                         , m_called(false)
  62                                 {
  63                                 }
  64
  65                                 proxy_member_caller(const proxy_member_caller& rhs)
  66                                         : L(rhs.L)
  67                                         , m_args(rhs.m_args)
  68                                         , m_called(rhs.m_called)
  69                                 {
  70                                         rhs.m_called = true;
  71                                 }
  72
  73                                 ~proxy_member_caller()
  74                                 {
  75                                         if (m_called) return;
  76
  77                                         m_called = true;
  78
  79                                         // don't count the function and self-reference
  80                                         // since those will be popped by pcall
  81                                         int top = lua_gettop(L) - 2;
  82
  83                                         // pcall will pop the function and self reference
  84                                         // and all the parameters
  85
  86                                         push_args_from_tuple<1>::apply(L, m_args);
  87                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
  88                                         {
  89                                                 assert(lua_gettop(L) == top + 1);
  90 #ifndef LUABIND_NO_EXCEPTIONS
  91                                                 throw luabind::error(L);
  92 #else
  93                                                 error_callback_fun e = get_error_callback();
  94                                                 if (e) e(L);
  95
  96                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
  97                                                                 "If you want to handle this error use luabind::set_error_callback()");
  98                                                 std::terminate();
  99 #endif
 100                                         }
 101                                         // pops the return values from the function
 102                                         stack_pop pop(L, lua_gettop(L) - top);
 103                                 }
 104
 105                                 operator Ret()
 106                                 {
 107                                         typename mpl::apply_wrap2<default_policy,Ret,lua_to_cpp>::type converter;
 108
 109                                         m_called = true;
 110
 111                                         // don't count the function and self-reference
 112                                         // since those will be popped by pcall
 113                                         int top = lua_gettop(L) - 2;
 114
 115                                         // pcall will pop the function and self reference
 116                                         // and all the parameters
 117                                         push_args_from_tuple<1>::apply(L, m_args);
 118                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 119                                         {
 120                                                 assert(lua_gettop(L) == top + 1);
 121 #ifndef LUABIND_NO_EXCEPTIONS
 122                                                 throw luabind::error(L);
 123 #else
 124                                                 error_callback_fun e = get_error_callback();
 125                                                 if (e) e(L);
 126
 127                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 128                                                         "If you want to handle this error use luabind::set_error_callback()");
 129                                                 std::terminate();
 130 #endif
 131                                         }
 132
 133                                         // pops the return values from the function
 134                                         stack_pop pop(L, lua_gettop(L) - top);
 135
 136 #ifndef LUABIND_NO_ERROR_CHECKING
 137
 138                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 139                                         {
 140                                                 assert(lua_gettop(L) == top + 1);
 141 #ifndef LUABIND_NO_EXCEPTIONS
 142                                                 throw cast_failed(L, typeid(Ret));
 143 #else
 144                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 145                                                 if (e) e(L, typeid(Ret));
 146
 147                                                 assert(0 && "the lua function's return value could not be converted."
 148                                                         "If you want to handle this error use luabind::set_error_callback()");
 149                                                 std::terminate();
 150 #endif
 151                                         }
 152 #endif
 153                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 154                                 }
 155
 156                                 template<class Policies>
 157                                 Ret operator[](const Policies& p)
 158                                 {
 159                                         typedef typename find_conversion_policy<0, Policies>::type converter_policy;
 160                                         typename mpl::apply_wrap2<converter_policy,Ret,lua_to_cpp>::type converter;
 161
 162                                         m_called = true;
 163
 164                                         // don't count the function and self-reference
 165                                         // since those will be popped by pcall
 166                                         int top = lua_gettop(L) - 2;
 167
 168                                         // pcall will pop the function and self reference
 169                                         // and all the parameters
 170
 171                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 172                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 1))
 173                                         {
 174                                                 assert(lua_gettop(L) == top + 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 this error use luabind::set_error_callback()");
 183                                                 std::terminate();
 184 #endif
 185                                         }
 186
 187                                         // pops the return values from the function
 188                                         stack_pop pop(L, lua_gettop(L) - top);
 189
 190 #ifndef LUABIND_NO_ERROR_CHECKING
 191
 192                                         if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
 193                                         {
 194                                                 assert(lua_gettop(L) == top + 1);
 195 #ifndef LUABIND_NO_EXCEPTIONS
 196                                                 throw cast_failed(L, typeid(Ret));
 197 #else
 198                                                 cast_failed_callback_fun e = get_cast_failed_callback();
 199                                                 if (e) e(L, typeid(Ret));
 200
 201                                                 assert(0 && "the lua function's return value could not be converted."
 202                                                         "If you want to handle this error use luabind::set_error_callback()");
 203                                                 std::terminate();
 204 #endif
 205                                         }
 206 #endif
 207                                         return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
 208                                 }
 209
 210                         private:
 211
 212                                 lua_State* L;
 213                                 Tuple m_args;
 214                                 mutable bool m_called;
 215
 216                         };
 217
 218                 // if the proxy_member_caller returns void
 219                         template<class Tuple>
 220                         class proxy_member_void_caller
 221                         {
 222                         friend class luabind::object;
 223                         public:
 224
 225                                 proxy_member_void_caller(lua_State* L_, const Tuple args)
 226                                         : L(L_)
 227                                         , m_args(args)
 228                                         , m_called(false)
 229                                 {
 230                                 }
 231
 232                                 proxy_member_void_caller(const proxy_member_void_caller& rhs)
 233                                         : L(rhs.L)
 234                                         , m_args(rhs.m_args)
 235                                         , m_called(rhs.m_called)
 236                                 {
 237                                         rhs.m_called = true;
 238                                 }
 239
 240                                 ~proxy_member_void_caller()
 241                                 {
 242                                         if (m_called) return;
 243
 244                                         m_called = true;
 245
 246                                         // don't count the function and self-reference
 247                                         // since those will be popped by pcall
 248                                         int top = lua_gettop(L) - 2;
 249
 250                                         // pcall will pop the function and self reference
 251                                         // and all the parameters
 252
 253                                         push_args_from_tuple<1>::apply(L, m_args);
 254                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 255                                         {
 256                                                 assert(lua_gettop(L) == top + 1);
 257 #ifndef LUABIND_NO_EXCEPTIONS
 258                                                 throw luabind::error(L);
 259 #else
 260                                                 error_callback_fun e = get_error_callback();
 261                                                 if (e) e(L);
 262
 263                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 264                                                         "If you want to handle this error use luabind::set_error_callback()");
 265                                                 std::terminate();
 266 #endif
 267                                         }
 268                                         // pops the return values from the function
 269                                         stack_pop pop(L, lua_gettop(L) - top);
 270                                 }
 271
 272                                 template<class Policies>
 273                                 void operator[](const Policies& p)
 274                                 {
 275                                         m_called = true;
 276
 277                                         // don't count the function and self-reference
 278                                         // since those will be popped by pcall
 279                                         int top = lua_gettop(L) - 2;
 280
 281                                         // pcall will pop the function and self reference
 282                                         // and all the parameters
 283
 284                                         detail::push_args_from_tuple<1>::apply(L, m_args, p);
 285                                         if (pcall(L, boost::tuples::length<Tuple>::value + 1, 0))
 286                                         {
 287                                                 assert(lua_gettop(L) == top + 1);
 288 #ifndef LUABIND_NO_EXCEPTIONS
 289                                                 throw error(L);
 290 #else
 291                                                 error_callback_fun e = get_error_callback();
 292                                                 if (e) e(L);
 293
 294                                                 assert(0 && "the lua function threw an error and exceptions are disabled."
 295                                                         "If you want to handle this error use luabind::set_error_callback()");
 296                                                 std::terminate();
 297 #endif
 298                                         }
 299                                         // pops the return values from the function
 300                                         stack_pop pop(L, lua_gettop(L) - top);
 301                                 }
 302
 303                         private:
 304                                 lua_State* L;
 305                                 Tuple m_args;
 306                                 mutable bool m_called;
 307
 308                         };
 309
 310         } // detail
 311
 312         #define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_member.hpp>, 1))
 313         #include BOOST_PP_ITERATE()
 314
 315 }
 316
 317 #endif // LUABIND_CALL_MEMBER_HPP_INCLUDED
 318
 319 #elif BOOST_PP_ITERATION_FLAGS() == 1
 320
 321 #define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
 322 #define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n
 323
 324         template<class R BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
 325         typename boost::mpl::if_<boost::is_void<R>
 326                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 327                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
 328         call_member(object const& obj, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _))
 329         {
 330                 typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
 331 #if BOOST_PP_ITERATION() == 0
 332                 tuple_t args;
 333 #else
 334                 tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
 335 #endif
 336
 337                 typedef typename boost::mpl::if_<boost::is_void<R>
 338                         , luabind::detail::proxy_member_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
 339                         , luabind::detail::proxy_member_caller<R, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;
 340
 341                 // this will be cleaned up by the proxy object
 342                 // once the call has been made
 343
 344                 // get the function
 345                 obj.push(obj.interpreter());
 346                 lua_pushstring(obj.interpreter(), name);
 347                 lua_gettable(obj.interpreter(), -2);
 348                 // duplicate the self-object
 349                 lua_pushvalue(obj.interpreter(), -2);
 350                 // remove the bottom self-object
 351                 lua_remove(obj.interpreter(), -3);
 352
 353                 // now the function and self objects
 354                 // are on the stack. These will both
 355                 // be popped by pcall
 356                 return proxy_type(obj.interpreter(), args);
 357         }
 358
 359 #undef LUABIND_OPERATOR_PARAMS
 360 #undef LUABIND_TUPLE_PARAMS
 361
 362 #endif
 363