297 lines
7.6 KiB
C++
297 lines
7.6 KiB
C++
///@file
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//
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// Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#ifndef SG_NASAL_HASH_HXX_
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#define SG_NASAL_HASH_HXX_
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#include "from_nasal.hxx"
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#include "to_nasal.hxx"
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#include <simgear/structure/map.hxx>
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#include <boost/iterator/iterator_facade.hpp>
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namespace nasal
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{
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/**
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* Wrapper class for Nasal hashes.
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*/
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class Hash
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{
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public:
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template<bool> class Entry;
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template<bool> class Iterator;
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typedef Entry<false> reference;
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typedef Entry<true> const_reference;
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typedef Iterator<false> iterator;
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typedef Iterator<true> const_iterator;
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/**
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* Create a new Nasal Hash
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*
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* @param c Nasal context for creating the hash
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*/
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explicit Hash(naContext c);
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/**
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* Initialize from an existing Nasal Hash
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*
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* @param hash Existing Nasal Hash
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* @param c Nasal context for creating new Nasal objects
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*/
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Hash(naRef hash, naContext c);
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iterator begin();
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iterator end();
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const_iterator begin() const;
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const_iterator end() const;
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/**
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* Set member
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*
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* @param name Member name
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* @param ref Reference to Nasal object (naRef)
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*/
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void set(const std::string& name, naRef ref);
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/**
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* Set member to anything convertible using to_nasal
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*
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* @param name Member name
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* @param val Value (has to be convertible with to_nasal)
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*/
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template<class T>
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void set(const std::string& name, const T& val)
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{
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set(name, to_nasal(_context, val));
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}
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/**
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* Get member
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*
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* @param key Member key
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*/
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naRef get(naRef key) const;
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/**
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* Get member
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*
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* @param name Member name
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*/
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naRef get(const std::string& name) const;
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/**
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* Get member converted to given type
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*
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* @tparam T Type to convert to (using from_nasal)
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* @param name Member name
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*/
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template<class T, class Key>
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T get(const Key& name) const
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{
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BOOST_STATIC_ASSERT(( boost::is_convertible<Key, naRef>::value
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|| boost::is_convertible<Key, std::string>::value
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));
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return from_nasal<T>(_context, get(name));
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}
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/**
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* Get member converted to callable object
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*
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* @tparam Sig Function signature
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* @param name Member name
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*/
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template<class Sig, class Key>
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typename std::enable_if< std::is_function<Sig>::value,
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std::function<Sig>
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>::type
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get(const Key& name) const
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{
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BOOST_STATIC_ASSERT(( boost::is_convertible<Key, naRef>::value
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|| boost::is_convertible<Key, std::string>::value
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));
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return from_nasal_helper(_context, get(name), static_cast<Sig*>(0));
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}
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/**
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* Returns the number of entries in the hash
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*/
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int size() const;
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/**
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* Get a list of all keys
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*/
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std::vector<std::string> keys() const;
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/**
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* Create a new child hash (module)
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*
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* @param name Name of the new hash inside this hash
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*/
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Hash createHash(const std::string& name);
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/**
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* Set a new Nasal context. Eg. in FlightGear the context changes every
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* frame, so if using the same Hash instance for multiple frames you have
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* to update the context before using the Hash object.
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*/
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void setContext(naContext context);
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/**
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* Get Nasal representation of Hash
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*/
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naRef get_naRef() const;
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/**
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* Get Nasal vector of keys
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*/
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naRef get_naRefKeys() const;
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/// Hash entry
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template<bool is_const>
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class Entry
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{
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public:
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typedef typename boost::mpl::if_c<
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is_const,
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Hash const*,
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Hash*
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>::type HashPtr;
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Entry(HashPtr hash, naRef key):
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_hash(hash),
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_key(key)
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{
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assert(hash);
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assert(naIsScalar(key));
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}
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std::string getKey() const
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{
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if( !_hash || naIsNil(_key) )
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return std::string();
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return from_nasal<std::string>(_hash->_context, _key);
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}
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template<class T>
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T getValue() const
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{
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if( !_hash || naIsNil(_key) )
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return T();
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return _hash->template get<T>(_key);
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}
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private:
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HashPtr _hash;
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naRef _key;
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};
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/// Hash iterator
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template<bool is_const>
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class Iterator:
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public boost::iterator_facade<
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Iterator<is_const>,
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Entry<is_const>,
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boost::bidirectional_traversal_tag,
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Entry<is_const>
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>
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{
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public:
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typedef typename Entry<is_const>::HashPtr HashPtr;
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typedef Entry<is_const> value_type;
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Iterator():
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_hash(NULL),
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_index(0)
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{}
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Iterator(HashPtr hash, int index):
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_hash(hash),
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_index(index)
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{}
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/**
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* Convert from iterator to const_iterator or copy within same type
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*/
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template<bool is_other_const>
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Iterator( Iterator<is_other_const> const& other,
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typename std::enable_if< is_const || !is_other_const,
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void*
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>::type = NULL ):
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_hash(other._hash),
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_index(other._index)
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{}
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private:
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friend class boost::iterator_core_access;
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template <bool> friend class Iterator;
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HashPtr _hash;
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int _index;
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template<bool is_other_const>
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bool equal(Iterator<is_other_const> const& other) const
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{
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return _hash == other._hash
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&& _index == other._index;
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}
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void increment() { ++_index; }
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void decrement() { --_index; }
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value_type dereference() const
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{
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return value_type(_hash, naVec_get(_hash->get_naRefKeys(), _index));
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}
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};
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protected:
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naRef _hash;
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naContext _context;
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mutable naRef _keys; //< Store vector of keys (for iterators)
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};
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} // namespace nasal
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template<class Value>
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simgear::Map<std::string, Value>
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from_nasal_helper( naContext c,
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naRef ref,
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const simgear::Map<std::string, Value>* )
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{
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nasal::Hash hash = from_nasal_helper(c, ref, static_cast<nasal::Hash*>(0));
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simgear::Map<std::string, Value> map;
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for(nasal::Hash::const_iterator it = hash.begin(); it != hash.end(); ++it)
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map[ it->getKey() ] = it->getValue<Value>();
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return map;
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}
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#endif /* SG_NASAL_HASH_HXX_ */
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