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File indexing completed on 2025-01-30 09:58:09
0001 // ---------------------------------------------------------------------------- 0002 // Copyright (C) 2002-2006 Marcin Kalicinski 0003 // Copyright (C) 2009 Sebastian Redl 0004 // 0005 // Distributed under the Boost Software License, Version 1.0. 0006 // (See accompanying file LICENSE_1_0.txt or copy at 0007 // http://www.boost.org/LICENSE_1_0.txt) 0008 // 0009 // For more information, see www.boost.org 0010 // ---------------------------------------------------------------------------- 0011 0012 #ifndef BOOST_PROPERTY_TREE_PTREE_HPP_INCLUDED 0013 #define BOOST_PROPERTY_TREE_PTREE_HPP_INCLUDED 0014 0015 #include <boost/property_tree/ptree_fwd.hpp> 0016 #include <boost/property_tree/string_path.hpp> 0017 #include <boost/property_tree/stream_translator.hpp> 0018 #include <boost/property_tree/exceptions.hpp> 0019 #include <boost/property_tree/detail/ptree_utils.hpp> 0020 0021 #include <boost/multi_index_container.hpp> 0022 #include <boost/multi_index/indexed_by.hpp> 0023 #include <boost/multi_index/sequenced_index.hpp> 0024 #include <boost/multi_index/ordered_index.hpp> 0025 #include <boost/multi_index/member.hpp> 0026 #include <boost/core/enable_if.hpp> 0027 #include <boost/throw_exception.hpp> 0028 #include <boost/optional/optional.hpp> 0029 #include <utility> // for std::pair 0030 0031 namespace boost { namespace property_tree 0032 { 0033 0034 /** 0035 * Property tree main structure. A property tree is a hierarchical data 0036 * structure which has one element of type @p Data in each node, as well 0037 * as an ordered sequence of sub-nodes, which are additionally identified 0038 * by a non-unique key of type @p Key. 0039 * 0040 * Key equivalency is defined by @p KeyCompare, a predicate defining a 0041 * strict weak ordering. 0042 * 0043 * Property tree defines a Container-like interface to the (key-node) pairs 0044 * of its direct sub-nodes. The iterators are bidirectional. The sequence 0045 * of nodes is held in insertion order, not key order. 0046 */ 0047 template<class Key, class Data, class KeyCompare> 0048 class basic_ptree 0049 { 0050 #if defined(BOOST_PROPERTY_TREE_DOXYGEN_INVOKED) 0051 public: 0052 #endif 0053 // Internal types 0054 /** 0055 * Simpler way to refer to this basic_ptree\<C,K,P,A\> type. 0056 * Note that this is private, and made public only for doxygen. 0057 */ 0058 typedef basic_ptree<Key, Data, KeyCompare> self_type; 0059 0060 public: 0061 // Basic types 0062 typedef Key key_type; 0063 typedef Data data_type; 0064 typedef KeyCompare key_compare; 0065 0066 // Container view types 0067 typedef std::pair<const Key, self_type> value_type; 0068 typedef std::size_t size_type; 0069 0070 // The problem with the iterators is that I can't make them complete 0071 // until the container is complete. Sucks. Especially for the reverses. 0072 class iterator; 0073 class const_iterator; 0074 class reverse_iterator; 0075 class const_reverse_iterator; 0076 0077 // Associative view types 0078 class assoc_iterator; 0079 class const_assoc_iterator; 0080 0081 // Property tree view types 0082 typedef typename path_of<Key>::type path_type; 0083 0084 0085 // The big five 0086 0087 /** Creates a node with no children and default-constructed data. */ 0088 basic_ptree(); 0089 /** Creates a node with no children and a copy of the given data. */ 0090 explicit basic_ptree(const data_type &data); 0091 basic_ptree(const self_type &rhs); 0092 ~basic_ptree(); 0093 /** Basic guarantee only. */ 0094 self_type &operator =(const self_type &rhs); 0095 0096 /** Swap with other tree. Only constant-time and nothrow if the 0097 * data type's swap is. 0098 */ 0099 void swap(self_type &rhs); 0100 0101 // Container view functions 0102 0103 /** The number of direct children of this node. */ 0104 size_type size() const; 0105 size_type max_size() const; 0106 /** Whether there are any direct children. */ 0107 bool empty() const; 0108 0109 iterator begin(); 0110 const_iterator begin() const; 0111 iterator end(); 0112 const_iterator end() const; 0113 reverse_iterator rbegin(); 0114 const_reverse_iterator rbegin() const; 0115 reverse_iterator rend(); 0116 const_reverse_iterator rend() const; 0117 0118 value_type &front(); 0119 const value_type &front() const; 0120 value_type &back(); 0121 const value_type &back() const; 0122 0123 /** Insert a copy of the given tree with its key just before the given 0124 * position in this node. This operation invalidates no iterators. 0125 * @return An iterator to the newly created child. 0126 */ 0127 iterator insert(iterator where, const value_type &value); 0128 0129 /** Range insert. Equivalent to: 0130 * @code 0131 * for(; first != last; ++first) insert(where, *first); 0132 * @endcode 0133 */ 0134 template<class It> void insert(iterator where, It first, It last); 0135 0136 /** Erase the child pointed at by the iterator. This operation 0137 * invalidates the given iterator, as well as its equivalent 0138 * assoc_iterator. 0139 * @return A valid iterator pointing to the element after the erased. 0140 */ 0141 iterator erase(iterator where); 0142 0143 /** Range erase. Equivalent to: 0144 * @code 0145 * while(first != last;) first = erase(first); 0146 * @endcode 0147 */ 0148 iterator erase(iterator first, iterator last); 0149 0150 /** Equivalent to insert(begin(), value). */ 0151 iterator push_front(const value_type &value); 0152 0153 /** Equivalent to insert(end(), value). */ 0154 iterator push_back(const value_type &value); 0155 0156 /** Equivalent to erase(begin()). */ 0157 void pop_front(); 0158 0159 /** Equivalent to erase(boost::prior(end())). */ 0160 void pop_back(); 0161 0162 /** Reverses the order of direct children in the property tree. */ 0163 void reverse(); 0164 0165 /** Sorts the direct children of this node according to the predicate. 0166 * The predicate is passed the whole pair of key and child. 0167 */ 0168 template<class Compare> void sort(Compare comp); 0169 0170 /** Sorts the direct children of this node according to key order. */ 0171 void sort(); 0172 0173 // Equality 0174 0175 /** Two property trees are the same if they have the same data, the keys 0176 * and order of their children are the same, and the children compare 0177 * equal, recursively. 0178 */ 0179 bool operator ==(const self_type &rhs) const; 0180 bool operator !=(const self_type &rhs) const; 0181 0182 // Associative view 0183 0184 /** Returns an iterator to the first child, in key order. */ 0185 assoc_iterator ordered_begin(); 0186 /** Returns an iterator to the first child, in key order. */ 0187 const_assoc_iterator ordered_begin() const; 0188 0189 /** Returns the not-found iterator. Equivalent to end() in a real 0190 * associative container. 0191 */ 0192 assoc_iterator not_found(); 0193 /** Returns the not-found iterator. Equivalent to end() in a real 0194 * associative container. 0195 */ 0196 const_assoc_iterator not_found() const; 0197 0198 /** Find a child with the given key, or not_found() if there is none. 0199 * There is no guarantee about which child is returned if multiple have 0200 * the same key. 0201 */ 0202 assoc_iterator find(const key_type &key); 0203 0204 /** Find a child with the given key, or not_found() if there is none. 0205 * There is no guarantee about which child is returned if multiple have 0206 * the same key. 0207 */ 0208 const_assoc_iterator find(const key_type &key) const; 0209 0210 /** Find the range of children that have the given key. */ 0211 std::pair<assoc_iterator, assoc_iterator> 0212 equal_range(const key_type &key); 0213 0214 /** Find the range of children that have the given key. */ 0215 std::pair<const_assoc_iterator, const_assoc_iterator> 0216 equal_range(const key_type &key) const; 0217 0218 /** Count the number of direct children with the given key. */ 0219 size_type count(const key_type &key) const; 0220 0221 /** Erase all direct children with the given key and return the count. 0222 */ 0223 size_type erase(const key_type &key); 0224 0225 /** Get the iterator that points to the same element as the argument. 0226 * @note A valid assoc_iterator range (a, b) does not imply that 0227 * (to_iterator(a), to_iterator(b)) is a valid range. 0228 */ 0229 iterator to_iterator(assoc_iterator it); 0230 0231 /** Get the iterator that points to the same element as the argument. 0232 * @note A valid const_assoc_iterator range (a, b) does not imply that 0233 * (to_iterator(a), to_iterator(b)) is a valid range. 0234 */ 0235 const_iterator to_iterator(const_assoc_iterator it) const; 0236 0237 // Property tree view 0238 0239 /** Reference to the actual data in this node. */ 0240 data_type &data(); 0241 0242 /** Reference to the actual data in this node. */ 0243 const data_type &data() const; 0244 0245 /** Clear this tree completely, of both data and children. */ 0246 void clear(); 0247 0248 /** Get the child at the given path, or throw @c ptree_bad_path. 0249 * @note Depending on the path, the result at each level may not be 0250 * completely deterministic, i.e. if the same key appears multiple 0251 * times, which child is chosen is not specified. This can lead 0252 * to the path not being resolved even though there is a 0253 * descendant with this path. Example: 0254 * @code 0255 * a -> b -> c 0256 * -> b 0257 * @endcode 0258 * The path "a.b.c" will succeed if the resolution of "b" chooses 0259 * the first such node, but fail if it chooses the second. 0260 */ 0261 self_type &get_child(const path_type &path); 0262 0263 /** Get the child at the given path, or throw @c ptree_bad_path. */ 0264 const self_type &get_child(const path_type &path) const; 0265 0266 /** Get the child at the given path, or return @p default_value. */ 0267 self_type &get_child(const path_type &path, self_type &default_value); 0268 0269 /** Get the child at the given path, or return @p default_value. */ 0270 const self_type &get_child(const path_type &path, 0271 const self_type &default_value) const; 0272 0273 /** Get the child at the given path, or return boost::null. */ 0274 optional<self_type &> get_child_optional(const path_type &path); 0275 0276 /** Get the child at the given path, or return boost::null. */ 0277 optional<const self_type &> 0278 get_child_optional(const path_type &path) const; 0279 0280 /** Set the node at the given path to the given value. Create any 0281 * missing parents. If the node at the path already exists, replace it. 0282 * @return A reference to the inserted subtree. 0283 * @note Because of the way paths work, it is not generally guaranteed 0284 * that a node newly created can be accessed using the same path. 0285 * @note If the path could refer to multiple nodes, it is unspecified 0286 * which one gets replaced. 0287 */ 0288 self_type &put_child(const path_type &path, const self_type &value); 0289 0290 /** Add the node at the given path. Create any missing parents. If there 0291 * already is a node at the path, add another one with the same key. 0292 * @param path Path to the child. The last fragment must not have an 0293 * index. 0294 * @return A reference to the inserted subtree. 0295 * @note Because of the way paths work, it is not generally guaranteed 0296 * that a node newly created can be accessed using the same path. 0297 */ 0298 self_type &add_child(const path_type &path, const self_type &value); 0299 0300 /** Take the value of this node and attempt to translate it to a 0301 * @c Type object using the supplied translator. 0302 * @throw ptree_bad_data if the conversion fails. 0303 */ 0304 template<class Type, class Translator> 0305 typename boost::enable_if<detail::is_translator<Translator>, Type>::type 0306 get_value(Translator tr) const; 0307 0308 /** Take the value of this node and attempt to translate it to a 0309 * @c Type object using the default translator. 0310 * @throw ptree_bad_data if the conversion fails. 0311 */ 0312 template<class Type> 0313 Type get_value() const; 0314 0315 /** Take the value of this node and attempt to translate it to a 0316 * @c Type object using the supplied translator. Return @p default_value 0317 * if this fails. 0318 */ 0319 template<class Type, class Translator> 0320 Type get_value(const Type &default_value, Translator tr) const; 0321 0322 /** Make get_value do the right thing for string literals. */ 0323 template <class Ch, class Translator> 0324 typename boost::enable_if< 0325 detail::is_character<Ch>, 0326 std::basic_string<Ch> 0327 >::type 0328 get_value(const Ch *default_value, Translator tr) const; 0329 0330 /** Take the value of this node and attempt to translate it to a 0331 * @c Type object using the default translator. Return @p default_value 0332 * if this fails. 0333 */ 0334 template<class Type> 0335 typename boost::disable_if<detail::is_translator<Type>, Type>::type 0336 get_value(const Type &default_value) const; 0337 0338 /** Make get_value do the right thing for string literals. */ 0339 template <class Ch> 0340 typename boost::enable_if< 0341 detail::is_character<Ch>, 0342 std::basic_string<Ch> 0343 >::type 0344 get_value(const Ch *default_value) const; 0345 0346 /** Take the value of this node and attempt to translate it to a 0347 * @c Type object using the supplied translator. Return boost::null if 0348 * this fails. 0349 */ 0350 template<class Type, class Translator> 0351 optional<Type> get_value_optional(Translator tr) const; 0352 0353 /** Take the value of this node and attempt to translate it to a 0354 * @c Type object using the default translator. Return boost::null if 0355 * this fails. 0356 */ 0357 template<class Type> 0358 optional<Type> get_value_optional() const; 0359 0360 /** Replace the value at this node with the given value, translated 0361 * to the tree's data type using the supplied translator. 0362 * @throw ptree_bad_data if the conversion fails. 0363 */ 0364 template<class Type, class Translator> 0365 void put_value(const Type &value, Translator tr); 0366 0367 /** Replace the value at this node with the given value, translated 0368 * to the tree's data type using the default translator. 0369 * @throw ptree_bad_data if the conversion fails. 0370 */ 0371 template<class Type> 0372 void put_value(const Type &value); 0373 0374 /** Shorthand for get_child(path).get_value(tr). */ 0375 template<class Type, class Translator> 0376 typename boost::enable_if<detail::is_translator<Translator>, Type>::type 0377 get(const path_type &path, Translator tr) const; 0378 0379 /** Shorthand for get_child(path).get_value\<Type\>(). */ 0380 template<class Type> 0381 Type get(const path_type &path) const; 0382 0383 /** Shorthand for get_child(path, empty_ptree()) 0384 * .get_value(default_value, tr). 0385 * That is, return the translated value if possible, and the default 0386 * value if the node doesn't exist or conversion fails. 0387 */ 0388 template<class Type, class Translator> 0389 Type get(const path_type &path, 0390 const Type &default_value, 0391 Translator tr) const; 0392 0393 /** Make get do the right thing for string literals. */ 0394 template <class Ch, class Translator> 0395 typename boost::enable_if< 0396 detail::is_character<Ch>, 0397 std::basic_string<Ch> 0398 >::type 0399 get(const path_type &path, const Ch *default_value, Translator tr)const; 0400 0401 /** Shorthand for get_child(path, empty_ptree()) 0402 * .get_value(default_value). 0403 * That is, return the translated value if possible, and the default 0404 * value if the node doesn't exist or conversion fails. 0405 */ 0406 template<class Type> 0407 typename boost::disable_if<detail::is_translator<Type>, Type>::type 0408 get(const path_type &path, const Type &default_value) const; 0409 0410 /** Make get do the right thing for string literals. */ 0411 template <class Ch> 0412 typename boost::enable_if< 0413 detail::is_character<Ch>, 0414 std::basic_string<Ch> 0415 >::type 0416 get(const path_type &path, const Ch *default_value) const; 0417 0418 /** Shorthand for: 0419 * @code 0420 * if(optional\<self_type&\> node = get_child_optional(path)) 0421 * return node->get_value_optional(tr); 0422 * return boost::null; 0423 * @endcode 0424 * That is, return the value if it exists and can be converted, or nil. 0425 */ 0426 template<class Type, class Translator> 0427 optional<Type> get_optional(const path_type &path, Translator tr) const; 0428 0429 /** Shorthand for: 0430 * @code 0431 * if(optional\<const self_type&\> node = get_child_optional(path)) 0432 * return node->get_value_optional(); 0433 * return boost::null; 0434 * @endcode 0435 * That is, return the value if it exists and can be converted, or nil. 0436 */ 0437 template<class Type> 0438 optional<Type> get_optional(const path_type &path) const; 0439 0440 /** Set the value of the node at the given path to the supplied value, 0441 * translated to the tree's data type. If the node doesn't exist, it is 0442 * created, including all its missing parents. 0443 * @return The node that had its value changed. 0444 * @throw ptree_bad_data if the conversion fails. 0445 */ 0446 template<class Type, class Translator> 0447 self_type &put(const path_type &path, const Type &value, Translator tr); 0448 0449 /** Set the value of the node at the given path to the supplied value, 0450 * translated to the tree's data type. If the node doesn't exist, it is 0451 * created, including all its missing parents. 0452 * @return The node that had its value changed. 0453 * @throw ptree_bad_data if the conversion fails. 0454 */ 0455 template<class Type> 0456 self_type &put(const path_type &path, const Type &value); 0457 0458 /** If the node identified by the path does not exist, create it, 0459 * including all its missing parents. 0460 * If the node already exists, add a sibling with the same key. 0461 * Set the newly created node's value to the given paremeter, 0462 * translated with the supplied translator. 0463 * @param path Path to the child. The last fragment must not have an 0464 * index. 0465 * @param value The value to add. 0466 * @param tr The translator to use. 0467 * @return The node that was added. 0468 * @throw ptree_bad_data if the conversion fails. 0469 */ 0470 template<class Type, class Translator> 0471 self_type &add(const path_type &path, 0472 const Type &value, 0473 Translator tr); 0474 0475 /** If the node identified by the path does not exist, create it, 0476 * including all its missing parents. 0477 * If the node already exists, add a sibling with the same key. 0478 * Set the newly created node's value to the given paremeter, 0479 * translated with the supplied translator. 0480 * @param path Path to the child. The last fragment must not have an 0481 * index. 0482 * @param value The value to add. 0483 * @return The node that was added. 0484 * @throw ptree_bad_data if the conversion fails. 0485 */ 0486 template<class Type> 0487 self_type &add(const path_type &path, const Type &value); 0488 0489 private: 0490 // Hold the data of this node 0491 data_type m_data; 0492 // Hold the children - this is a void* because we can't complete the 0493 // container type within the class. 0494 void* m_children; 0495 0496 // Getter tree-walk. Not const-safe! Gets the node the path refers to, 0497 // or null. Destroys p's value. 0498 self_type* walk_path(path_type& p) const; 0499 0500 // Modifer tree-walk. Gets the parent of the node referred to by the 0501 // path, creating nodes as necessary. p is the path to the remaining 0502 // child. 0503 self_type& force_path(path_type& p); 0504 0505 // This struct contains typedefs for the concrete types. 0506 struct subs; 0507 friend struct subs; 0508 friend class iterator; 0509 friend class const_iterator; 0510 friend class reverse_iterator; 0511 friend class const_reverse_iterator; 0512 }; 0513 0514 }} 0515 0516 #include <boost/property_tree/detail/ptree_implementation.hpp> 0517 0518 #endif
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