luabind/container_policy.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 #ifndef LUABIND_CONTAINER_POLICY_HPP_INCLUDED
  25 #define LUABIND_CONTAINER_POLICY_HPP_INCLUDED
  26
  27 #include <luabind/config.hpp>
  28 #include <luabind/detail/policy.hpp>
  29
  30 namespace luabind { namespace detail {
  31
  32         template<class Policies>
  33         struct container_converter_lua_to_cpp
  34         {
  35                 template<class T>
  36                 T apply(lua_State* L, by_const_reference<T>, int index)
  37                 {
  38                         typedef typename T::value_type value_type;
  39
  40                         typedef typename find_conversion_policy<1, Policies>::type converter_policy;
  41                         typename converter_policy::template generate_converter<value_type, lua_to_cpp>::type converter;
  42
  43                         T container;
  44
  45                         lua_pushnil(L);
  46                         while (lua_next(L, index))
  47                         {
  48                                 container.push_back(converter.apply(L, LUABIND_DECORATE_TYPE(value_type), -1));
  49                                 lua_pop(L, 1); // pop value
  50                         }
  51
  52                         return container;
  53                 }
  54
  55                 template<class T>
  56                 T apply(lua_State* L, by_value<T>, int index)
  57                 {
  58                         return apply(L, by_const_reference<T>(), index);
  59                 }
  60
  61                 template<class T>
  62                 static int match(lua_State* L, by_const_reference<T>, int index)
  63                 {
  64                         if (lua_istable(L, index)) return 0; else return -1;
  65                 }
  66
  67                 template<class T>
  68                 void converter_postcall(lua_State*, T, int) {}
  69         };
  70
  71         template<class Policies>
  72         struct container_converter_cpp_to_lua
  73         {
  74                 template<class T>
  75                 void apply(lua_State* L, const T& container)
  76                 {
  77                         typedef typename T::value_type value_type;
  78
  79                         typedef typename find_conversion_policy<1, Policies>::type converter_policy;
  80                         typename converter_policy::template generate_converter<value_type, cpp_to_lua>::type converter;
  81
  82                         lua_newtable(L);
  83
  84                         int index = 1;
  85
  86                         for (typename T::const_iterator i = container.begin(); i != container.end(); ++i)
  87                         {
  88                                 converter.apply(L, *i);
  89                                 lua_rawseti(L, -2, index);
  90                                 ++index;
  91                         }
  92                 }
  93         };
  94
  95         template<int N, class Policies>
  96 //      struct container_policy : converter_policy_tag
  97         struct container_policy : conversion_policy<N>
  98         {
  99 //              BOOST_STATIC_CONSTANT(int, index = N);
 100
 101                 static void precall(lua_State*, const index_map&) {}
 102                 static void postcall(lua_State*, const index_map&) {}
 103
 104                 struct only_accepts_nonconst_pointers {};
 105
 106                 template<class T, class Direction>
 107                 struct generate_converter
 108                 {
 109                         typedef typename boost::mpl::if_<boost::is_same<lua_to_cpp, Direction>
 110                                 , container_converter_lua_to_cpp<Policies>
 111                                 , container_converter_cpp_to_lua<Policies>
 112                         >::type type;
 113                 };
 114         };
 115
 116 }}
 117
 118 namespace luabind
 119 {
 120         template<int N>
 121         detail::policy_cons<detail::container_policy<N, detail::null_type>, detail::null_type>
 122         container(boost::arg<N>) { return detail::policy_cons<detail::container_policy<N, detail::null_type>, detail::null_type>(); }
 123
 124         template<int N, class Policies>
 125         detail::policy_cons<detail::container_policy<N, Policies>, detail::null_type>
 126         container(boost::arg<N>, const Policies&) { return detail::policy_cons<detail::container_policy<N, Policies>, detail::null_type>(); }
 127 }
 128
 129 #endif // LUABIND_CONTAINER_POLICY_HPP_INCLUDED