src/function.cpp

   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 #include <luabind/lua_include.hpp>
  24
  25 #include <luabind/config.hpp>
  26 #include <luabind/luabind.hpp>
  27
  28 namespace luabind { namespace detail { namespace free_functions {
  29
  30     void function_rep::add_overload(overload_rep const& o)
  31     {
  32         std::vector<overload_rep>::iterator i = std::find(
  33             m_overloads.begin(), m_overloads.end(), o);
  34
  35         // if the overload already exists, overwrite the existing function
  36         if (i != m_overloads.end())
  37         {
  38             *i = o;
  39         }
  40         else
  41         {
  42             m_overloads.push_back(o);
  43         }
  44     }
  45
  46     int function_dispatcher(lua_State* L)
  47     {
  48         function_rep* rep = static_cast<function_rep*>(
  49             lua_touserdata(L, lua_upvalueindex(1))
  50         );
  51
  52         bool ambiguous = false;
  53         int min_match = std::numeric_limits<int>::max();
  54         int match_index = -1;
  55         bool ret;
  56
  57 #ifdef LUABIND_NO_ERROR_CHECKING
  58         if (rep->overloads().size() == 1)
  59         {
  60             match_index = 0;
  61         }
  62         else
  63         {
  64 #endif
  65             int num_params = lua_gettop(L);
  66             ret = find_best_match(
  67                 L
  68               , &rep->overloads().front()
  69               , (int)rep->overloads().size()
  70               , sizeof(overload_rep)
  71               , ambiguous
  72               , min_match
  73               , match_index
  74               , num_params
  75             );
  76 #ifdef LUABIND_NO_ERROR_CHECKING
  77         }
  78 #else
  79         if (!ret)
  80         {
  81             // this bock is needed to make sure the std::string is destructed
  82             {
  83                 std::string msg = "no match for function call '";
  84                 msg += rep->name();
  85                 msg += "' with the parameters (";
  86                 msg += stack_content_by_name(L, 1);
  87                 msg += ")\ncandidates are:\n";
  88
  89                 msg += get_overload_signatures(
  90                     L
  91                   , rep->overloads().begin()
  92                   , rep->overloads().end()
  93                   , rep->name()
  94                 );
  95
  96                 lua_pushstring(L, msg.c_str());
  97             }
  98
  99             lua_error(L);
 100         }
 101
 102         if (ambiguous)
 103         {
 104             // this bock is needed to make sure the std::string is destructed
 105             {
 106                 std::string msg = "call of overloaded function '";
 107                 msg += rep->name();
 108                 msg += "(";
 109                 msg += stack_content_by_name(L, 1);
 110                 msg += ") is ambiguous\nnone of the overloads "
 111                        "have a best conversion:";
 112
 113                 std::vector<overload_rep_base const*> candidates;
 114                 find_exact_match(
 115                     L
 116                   , &rep->overloads().front()
 117                   , (int)rep->overloads().size()
 118                   , sizeof(overload_rep)
 119                   , min_match
 120                   , num_params
 121                   , candidates
 122                 );
 123
 124                 msg += get_overload_signatures_candidates(
 125                     L
 126                   , candidates.begin()
 127                   , candidates.end()
 128                   , rep->name()
 129                 );
 130
 131                 lua_pushstring(L, msg.c_str());
 132             }
 133             lua_error(L);
 134         }
 135 #endif
 136         overload_rep const& ov_rep = rep->overloads()[match_index];
 137
 138 #ifndef LUABIND_NO_EXCEPTIONS
 139         try
 140         {
 141 #endif
 142             return ov_rep.call(L, ov_rep.fun);
 143 #ifndef LUABIND_NO_EXCEPTIONS
 144         }
 145         catch(const luabind::error&)
 146         {
 147         }
 148         catch(const std::exception& e)
 149         {
 150             lua_pushstring(L, e.what());
 151         }
 152         catch (const char* s)
 153         {
 154             lua_pushstring(L, s);
 155         }
 156         catch(...)
 157         {
 158             std::string msg = rep->name();
 159             msg += "() threw an exception";
 160             lua_pushstring(L, msg.c_str());
 161         }
 162         // we can only reach this line if an exception was thrown
 163         lua_error(L);
 164         return 0; // will never be reached
 165 #endif
 166     }
 167
 168
 169 }}} // namespace luabind::detail::free_functions
 170
 171 #if 0
 172
 173 void luabind::detail::free_functions::function_rep::add_overload(
 174     luabind::detail::free_functions::overload_rep const& o)
 175 {
 176     std::vector<luabind::detail::free_functions::overload_rep>::iterator i
 177         = std::find(m_overloads.begin(), m_overloads.end(), o);
 178
 179     // if the overload already exists, overwrite the existing function
 180     if (i != m_overloads.end())
 181     {
 182         *i = o;
 183     }
 184     else
 185     {
 186         m_overloads.push_back(o);
 187     }
 188 }
 189
 190 int luabind::detail::free_functions::function_dispatcher(lua_State* L)
 191 {
 192     function_rep* rep = static_cast<function_rep*>(lua_touserdata(L, lua_upvalueindex(1)));
 193
 194     bool ambiguous = false;
 195     int min_match = std::numeric_limits<int>::max();
 196     int match_index = -1;
 197     bool ret;
 198
 199 #ifdef LUABIND_NO_ERROR_CHECKING
 200
 201     if (rep->overloads().size() == 1)
 202     {
 203         match_index = 0;
 204     }
 205     else
 206     {
 207
 208 #endif
 209         int num_params = lua_gettop(L);
 210         ret = find_best_match(
 211             L, &rep->overloads().front(), (int)rep->overloads().size()
 212           , sizeof(free_functions::overload_rep), ambiguous, min_match
 213           , match_index, num_params);
 214
 215 #ifdef LUABIND_NO_ERROR_CHECKING
 216     }
 217
 218 #else
 219
 220     if (!ret)
 221     {
 222         // this bock is needed to make sure the std::string is destructed
 223         {
 224             std::string msg = "no match for function call '";
 225             msg += rep->name();
 226             msg += "' with the parameters (";
 227             msg += stack_content_by_name(L, 1);
 228             msg += ")\ncandidates are:\n";
 229
 230             msg += get_overload_signatures(L, rep->overloads().begin(), rep->overloads().end(), rep->name());
 231
 232             lua_pushstring(L, msg.c_str());
 233         }
 234
 235         lua_error(L);
 236     }
 237
 238     if (ambiguous)
 239     {
 240         // this bock is needed to make sure the std::string is destructed
 241         {
 242             std::string msg = "call of overloaded function '";
 243             msg += rep->name();
 244             msg += "(";
 245             msg += stack_content_by_name(L, 1);
 246             msg += ") is ambiguous\nnone of the overloads have a best conversion:";
 247
 248             std::vector<const overload_rep_base*> candidates;
 249             find_exact_match(
 250                 L, &rep->overloads().front(), (int)rep->overloads().size()
 251               , sizeof(free_functions::overload_rep), min_match
 252               , num_params, candidates);
 253
 254             msg += get_overload_signatures_candidates(L, candidates.begin(), candidates.end(), rep->name());
 255
 256             lua_pushstring(L, msg.c_str());
 257         }
 258         lua_error(L);
 259     }
 260 #endif
 261     const overload_rep& ov_rep = rep->overloads()[match_index];
 262
 263 #ifndef LUABIND_NO_EXCEPTIONS
 264     try
 265     {
 266 #endif
 267         return ov_rep.call(L, ov_rep.fun);
 268 #ifndef LUABIND_NO_EXCEPTIONS
 269     }
 270     catch(const luabind::error& e)
 271     {
 272     }
 273     catch(const std::exception& e)
 274     {
 275         lua_pushstring(L, e.what());
 276     }
 277     catch (const char* s)
 278     {
 279         lua_pushstring(L, s);
 280     }
 281     catch(...)
 282     {
 283         std::string msg = rep->name();
 284         msg += "() threw an exception";
 285         lua_pushstring(L, msg.c_str());
 286     }
 287     // we can only reach this line if an exception was thrown
 288     lua_error(L);
 289     return 0; // will never be reached
 290 #endif
 291 }
 292
 293 #endif
 294