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 }}} // namespace luabind::detail::free_functions
 169