2 /// Conversion functions to convert C++ types to Nasal types
4 // Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Library General Public
8 // License as published by the Free Software Foundation; either
9 // version 2 of the License, or (at your option) any later version.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Library General Public License for more details.
16 // You should have received a copy of the GNU Library General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 #ifndef SG_TO_NASAL_HXX_
21 #define SG_TO_NASAL_HXX_
23 #include "nasal_traits.hxx"
25 #include <simgear/nasal/nasal.h>
27 #include <boost/utility/enable_if.hpp>
28 #include <boost/call_traits.hpp>
29 #include <boost/type_traits.hpp>
42 * Convert std::string to Nasal string
44 naRef to_nasal(naContext c, const std::string& str);
47 * Convert C-string to Nasal string
49 // We need this to prevent the array overload of to_nasal being called
50 naRef to_nasal(naContext c, const char* str);
53 * Convert function pointer to Nasal function
55 naRef to_nasal(naContext c, naCFunction func);
58 * Convert a nasal::Hash to a Nasal hash
60 naRef to_nasal(naContext c, const Hash& hash);
63 * Simple pass-through of naRef types to allow generic usage of to_nasal
65 naRef to_nasal(naContext c, const naRef& ref);
67 naRef to_nasal(naContext c, const SGPath& path);
70 * Convert a numeric type to Nasal number
73 typename boost::enable_if< boost::is_arithmetic<T>, naRef >::type
74 to_nasal(naContext c, T num)
80 * Convert a 2d vector to Nasal vector with 2 elements
83 typename boost::enable_if<is_vec2<Vec2>, naRef>::type
84 to_nasal(naContext c, const Vec2& vec);
87 * Convert a std::map to a Nasal Hash
90 naRef to_nasal(naContext c, const std::map<std::string, Value>& map);
93 * Convert a fixed size array to a Nasal vector
95 template<class T, size_t N>
96 naRef to_nasal(naContext c, const T(&array)[N]);
99 * Convert std::vector to Nasal vector
101 template< template<class T, class Alloc> class Vector,
105 typename boost::enable_if< boost::is_same< Vector<T,Alloc>,
110 to_nasal(naContext c, const Vector<T, Alloc>& vec)
112 naRef ret = naNewVector(c);
113 naVec_setsize(c, ret, vec.size());
114 for(size_t i = 0; i < vec.size(); ++i)
115 naVec_set(ret, i, to_nasal(c, vec[i]));
120 * Wrapper to get pointer to specific version of to_nasal applicable to given
126 typedef typename boost::call_traits<Var>::param_type param_type;
127 typedef naRef(*type)(naContext, param_type);
131 return static_cast<type>(&to_nasal);
135 //----------------------------------------------------------------------------
137 typename boost::enable_if<is_vec2<Vec2>, naRef>::type
138 to_nasal(naContext c, const Vec2& vec)
140 // We take just double because in Nasal every number is represented as
142 double nasal_vec[2] = {vec[0], vec[1]};
143 return to_nasal(c, nasal_vec);
146 //----------------------------------------------------------------------------
147 template<class Value>
148 naRef to_nasal(naContext c, const std::map<std::string, Value>& map)
150 naRef hash = naNewHash(c);
152 typedef typename boost::call_traits<Value>::param_type param_type;
153 typedef typename std::map<std::string, Value>::const_iterator map_iterator;
155 for( map_iterator it = map.begin(); it != map.end(); ++it )
159 to_nasal(c, it->first),
160 to_nasal(c, static_cast<param_type>(it->second))
166 //----------------------------------------------------------------------------
167 template<class T, size_t N>
168 naRef to_nasal(naContext c, const T(&array)[N])
170 naRef ret = naNewVector(c);
171 naVec_setsize(c, ret, N);
172 for(size_t i = 0; i < N; ++i)
173 naVec_set(ret, i, to_nasal(c, array[i]));
179 #endif /* SG_TO_NASAL_HXX_ */