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519 lines
20 KiB
C++
519 lines
20 KiB
C++
// ----------------------------------------------------------------------------
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// Copyright (C) 2002-2006 Marcin Kalicinski
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// Copyright (C) 2009 Sebastian Redl
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see www.boost.org
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// ----------------------------------------------------------------------------
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#ifndef BOOST_PROPERTY_TREE_PTREE_HPP_INCLUDED
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#define BOOST_PROPERTY_TREE_PTREE_HPP_INCLUDED
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#include <boost/property_tree/ptree_fwd.hpp>
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#include <boost/property_tree/string_path.hpp>
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#include <boost/property_tree/stream_translator.hpp>
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#include <boost/property_tree/exceptions.hpp>
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#include <boost/property_tree/detail/ptree_utils.hpp>
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#include <boost/multi_index_container.hpp>
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#include <boost/multi_index/indexed_by.hpp>
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#include <boost/multi_index/sequenced_index.hpp>
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#include <boost/multi_index/ordered_index.hpp>
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#include <boost/multi_index/member.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/optional.hpp>
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#include <utility> // for std::pair
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namespace boost { namespace property_tree
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{
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/**
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* Property tree main structure. A property tree is a hierarchical data
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* structure which has one element of type @p Data in each node, as well
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* as an ordered sequence of sub-nodes, which are additionally identified
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* by a non-unique key of type @p Key.
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*
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* Key equivalency is defined by @p KeyCompare, a predicate defining a
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* strict weak ordering.
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*
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* Property tree defines a Container-like interface to the (key-node) pairs
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* of its direct sub-nodes. The iterators are bidirectional. The sequence
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* of nodes is held in insertion order, not key order.
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*/
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template<class Key, class Data, class KeyCompare>
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class basic_ptree
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{
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#if defined(BOOST_PROPERTY_TREE_DOXYGEN_INVOKED)
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public:
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#endif
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// Internal types
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/**
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* Simpler way to refer to this basic_ptree\<C,K,P,A\> type.
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* Note that this is private, and made public only for doxygen.
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*/
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typedef basic_ptree<Key, Data, KeyCompare> self_type;
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public:
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// Basic types
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typedef Key key_type;
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typedef Data data_type;
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typedef KeyCompare key_compare;
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// Container view types
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typedef std::pair<const Key, self_type> value_type;
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typedef std::size_t size_type;
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// The problem with the iterators is that I can't make them complete
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// until the container is complete. Sucks. Especially for the reverses.
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class iterator;
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class const_iterator;
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class reverse_iterator;
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class const_reverse_iterator;
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// Associative view types
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class assoc_iterator;
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class const_assoc_iterator;
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// Property tree view types
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typedef typename path_of<Key>::type path_type;
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// The big five
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/** Creates a node with no children and default-constructed data. */
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basic_ptree();
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/** Creates a node with no children and a copy of the given data. */
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explicit basic_ptree(const data_type &data);
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basic_ptree(const self_type &rhs);
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~basic_ptree();
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/** Basic guarantee only. */
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self_type &operator =(const self_type &rhs);
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/** Swap with other tree. Only constant-time and nothrow if the
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* data type's swap is.
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*/
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void swap(self_type &rhs);
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// Container view functions
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/** The number of direct children of this node. */
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size_type size() const;
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size_type max_size() const;
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/** Whether there are any direct children. */
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bool empty() const;
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iterator begin();
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const_iterator begin() const;
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iterator end();
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const_iterator end() const;
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reverse_iterator rbegin();
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const_reverse_iterator rbegin() const;
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reverse_iterator rend();
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const_reverse_iterator rend() const;
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value_type &front();
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const value_type &front() const;
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value_type &back();
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const value_type &back() const;
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/** Insert a copy of the given tree with its key just before the given
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* position in this node. This operation invalidates no iterators.
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* @return An iterator to the newly created child.
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*/
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iterator insert(iterator where, const value_type &value);
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/** Range insert. Equivalent to:
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* @code
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* for(; first != last; ++first) insert(where, *first);
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* @endcode
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*/
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template<class It> void insert(iterator where, It first, It last);
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/** Erase the child pointed at by the iterator. This operation
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* invalidates the given iterator, as well as its equivalent
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* assoc_iterator.
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* @return A valid iterator pointing to the element after the erased.
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*/
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iterator erase(iterator where);
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/** Range erase. Equivalent to:
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* @code
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* while(first != last;) first = erase(first);
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* @endcode
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*/
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iterator erase(iterator first, iterator last);
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/** Equivalent to insert(begin(), value). */
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iterator push_front(const value_type &value);
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/** Equivalent to insert(end(), value). */
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iterator push_back(const value_type &value);
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/** Equivalent to erase(begin()). */
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void pop_front();
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/** Equivalent to erase(boost::prior(end())). */
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void pop_back();
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/** Reverses the order of direct children in the property tree. */
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void reverse();
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/** Sorts the direct children of this node according to the predicate.
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* The predicate is passed the whole pair of key and child.
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*/
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template<class Compare> void sort(Compare comp);
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/** Sorts the direct children of this node according to key order. */
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void sort();
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// Equality
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/** Two property trees are the same if they have the same data, the keys
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* and order of their children are the same, and the children compare
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* equal, recursively.
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*/
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bool operator ==(const self_type &rhs) const;
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bool operator !=(const self_type &rhs) const;
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// Associative view
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/** Returns an iterator to the first child, in key order. */
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assoc_iterator ordered_begin();
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/** Returns an iterator to the first child, in key order. */
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const_assoc_iterator ordered_begin() const;
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/** Returns the not-found iterator. Equivalent to end() in a real
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* associative container.
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*/
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assoc_iterator not_found();
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/** Returns the not-found iterator. Equivalent to end() in a real
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* associative container.
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*/
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const_assoc_iterator not_found() const;
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/** Find a child with the given key, or not_found() if there is none.
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* There is no guarantee about which child is returned if multiple have
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* the same key.
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*/
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assoc_iterator find(const key_type &key);
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/** Find a child with the given key, or not_found() if there is none.
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* There is no guarantee about which child is returned if multiple have
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* the same key.
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*/
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const_assoc_iterator find(const key_type &key) const;
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/** Find the range of children that have the given key. */
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std::pair<assoc_iterator, assoc_iterator>
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equal_range(const key_type &key);
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/** Find the range of children that have the given key. */
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std::pair<const_assoc_iterator, const_assoc_iterator>
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equal_range(const key_type &key) const;
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/** Count the number of direct children with the given key. */
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size_type count(const key_type &key) const;
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/** Erase all direct children with the given key and return the count.
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*/
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size_type erase(const key_type &key);
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/** Get the iterator that points to the same element as the argument.
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* @note A valid assoc_iterator range (a, b) does not imply that
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* (to_iterator(a), to_iterator(b)) is a valid range.
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*/
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iterator to_iterator(assoc_iterator it);
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/** Get the iterator that points to the same element as the argument.
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* @note A valid const_assoc_iterator range (a, b) does not imply that
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* (to_iterator(a), to_iterator(b)) is a valid range.
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*/
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const_iterator to_iterator(const_assoc_iterator it) const;
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// Property tree view
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/** Reference to the actual data in this node. */
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data_type &data();
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/** Reference to the actual data in this node. */
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const data_type &data() const;
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/** Clear this tree completely, of both data and children. */
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void clear();
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/** Get the child at the given path, or throw @c ptree_bad_path.
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* @note Depending on the path, the result at each level may not be
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* completely deterministic, i.e. if the same key appears multiple
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* times, which child is chosen is not specified. This can lead
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* to the path not being resolved even though there is a
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* descendant with this path. Example:
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* @code
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* a -> b -> c
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* -> b
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* @endcode
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* The path "a.b.c" will succeed if the resolution of "b" chooses
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* the first such node, but fail if it chooses the second.
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*/
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self_type &get_child(const path_type &path);
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/** Get the child at the given path, or throw @c ptree_bad_path. */
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const self_type &get_child(const path_type &path) const;
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/** Get the child at the given path, or return @p default_value. */
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self_type &get_child(const path_type &path, self_type &default_value);
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/** Get the child at the given path, or return @p default_value. */
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const self_type &get_child(const path_type &path,
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const self_type &default_value) const;
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/** Get the child at the given path, or return boost::null. */
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optional<self_type &> get_child_optional(const path_type &path);
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/** Get the child at the given path, or return boost::null. */
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optional<const self_type &>
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get_child_optional(const path_type &path) const;
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/** Set the node at the given path to the given value. Create any
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* missing parents. If the node at the path already exists, replace it.
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* @return A reference to the inserted subtree.
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* @note Because of the way paths work, it is not generally guaranteed
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* that a node newly created can be accessed using the same path.
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* @note If the path could refer to multiple nodes, it is unspecified
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* which one gets replaced.
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*/
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self_type &put_child(const path_type &path, const self_type &value);
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/** Add the node at the given path. Create any missing parents. If there
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* already is a node at the path, add another one with the same key.
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* @param path Path to the child. The last fragment must not have an
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* index.
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* @return A reference to the inserted subtree.
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* @note Because of the way paths work, it is not generally guaranteed
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* that a node newly created can be accessed using the same path.
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*/
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self_type &add_child(const path_type &path, const self_type &value);
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the supplied translator.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type, class Translator>
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typename boost::enable_if<detail::is_translator<Translator>, Type>::type
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get_value(Translator tr) const;
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the default translator.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type>
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Type get_value() const;
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the supplied translator. Return @p default_value
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* if this fails.
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*/
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template<class Type, class Translator>
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Type get_value(const Type &default_value, Translator tr) const;
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/** Make get_value do the right thing for string literals. */
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template <class Ch, class Translator>
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typename boost::enable_if<
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detail::is_character<Ch>,
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std::basic_string<Ch>
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>::type
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get_value(const Ch *default_value, Translator tr) const;
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the default translator. Return @p default_value
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* if this fails.
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*/
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template<class Type>
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typename boost::disable_if<detail::is_translator<Type>, Type>::type
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get_value(const Type &default_value) const;
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/** Make get_value do the right thing for string literals. */
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template <class Ch>
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typename boost::enable_if<
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detail::is_character<Ch>,
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std::basic_string<Ch>
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>::type
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get_value(const Ch *default_value) const;
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the supplied translator. Return boost::null if
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* this fails.
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*/
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template<class Type, class Translator>
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optional<Type> get_value_optional(Translator tr) const;
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/** Take the value of this node and attempt to translate it to a
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* @c Type object using the default translator. Return boost::null if
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* this fails.
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*/
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template<class Type>
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optional<Type> get_value_optional() const;
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/** Replace the value at this node with the given value, translated
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* to the tree's data type using the supplied translator.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type, class Translator>
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void put_value(const Type &value, Translator tr);
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/** Replace the value at this node with the given value, translated
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* to the tree's data type using the default translator.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type>
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void put_value(const Type &value);
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/** Shorthand for get_child(path).get_value(tr). */
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template<class Type, class Translator>
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typename boost::enable_if<detail::is_translator<Translator>, Type>::type
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get(const path_type &path, Translator tr) const;
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/** Shorthand for get_child(path).get_value\<Type\>(). */
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template<class Type>
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Type get(const path_type &path) const;
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/** Shorthand for get_child(path, empty_ptree())
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* .get_value(default_value, tr).
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* That is, return the translated value if possible, and the default
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* value if the node doesn't exist or conversion fails.
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*/
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template<class Type, class Translator>
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Type get(const path_type &path,
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const Type &default_value,
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Translator tr) const;
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/** Make get do the right thing for string literals. */
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template <class Ch, class Translator>
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typename boost::enable_if<
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detail::is_character<Ch>,
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std::basic_string<Ch>
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>::type
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get(const path_type &path, const Ch *default_value, Translator tr)const;
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/** Shorthand for get_child(path, empty_ptree())
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* .get_value(default_value).
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* That is, return the translated value if possible, and the default
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* value if the node doesn't exist or conversion fails.
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*/
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template<class Type>
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typename boost::disable_if<detail::is_translator<Type>, Type>::type
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get(const path_type &path, const Type &default_value) const;
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/** Make get do the right thing for string literals. */
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template <class Ch>
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typename boost::enable_if<
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detail::is_character<Ch>,
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std::basic_string<Ch>
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>::type
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get(const path_type &path, const Ch *default_value) const;
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/** Shorthand for:
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* @code
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* if(optional\<self_type&\> node = get_child_optional(path))
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* return node->get_value_optional(tr);
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* return boost::null;
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* @endcode
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* That is, return the value if it exists and can be converted, or nil.
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*/
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template<class Type, class Translator>
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optional<Type> get_optional(const path_type &path, Translator tr) const;
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/** Shorthand for:
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* @code
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* if(optional\<const self_type&\> node = get_child_optional(path))
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* return node->get_value_optional();
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* return boost::null;
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* @endcode
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* That is, return the value if it exists and can be converted, or nil.
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*/
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template<class Type>
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optional<Type> get_optional(const path_type &path) const;
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/** Set the value of the node at the given path to the supplied value,
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* translated to the tree's data type. If the node doesn't exist, it is
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* created, including all its missing parents.
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* @return The node that had its value changed.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type, class Translator>
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self_type &put(const path_type &path, const Type &value, Translator tr);
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/** Set the value of the node at the given path to the supplied value,
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* translated to the tree's data type. If the node doesn't exist, it is
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* created, including all its missing parents.
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* @return The node that had its value changed.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type>
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self_type &put(const path_type &path, const Type &value);
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/** If the node identified by the path does not exist, create it,
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* including all its missing parents.
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* If the node already exists, add a sibling with the same key.
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* Set the newly created node's value to the given paremeter,
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* translated with the supplied translator.
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* @param path Path to the child. The last fragment must not have an
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* index.
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* @param value The value to add.
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* @param tr The translator to use.
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* @return The node that was added.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type, class Translator>
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self_type &add(const path_type &path,
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const Type &value,
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Translator tr);
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/** If the node identified by the path does not exist, create it,
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* including all its missing parents.
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* If the node already exists, add a sibling with the same key.
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* Set the newly created node's value to the given paremeter,
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* translated with the supplied translator.
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* @param path Path to the child. The last fragment must not have an
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* index.
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* @param value The value to add.
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* @return The node that was added.
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* @throw ptree_bad_data if the conversion fails.
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*/
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template<class Type>
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self_type &add(const path_type &path, const Type &value);
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private:
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// Hold the data of this node
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data_type m_data;
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// Hold the children - this is a void* because we can't complete the
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// container type within the class.
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void* m_children;
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// Getter tree-walk. Not const-safe! Gets the node the path refers to,
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// or null. Destroys p's value.
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self_type* walk_path(path_type& p) const;
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// Modifer tree-walk. Gets the parent of the node referred to by the
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// path, creating nodes as necessary. p is the path to the remaining
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// child.
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self_type& force_path(path_type& p);
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// This struct contains typedefs for the concrete types.
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struct subs;
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friend struct subs;
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friend class iterator;
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friend class const_iterator;
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friend class reverse_iterator;
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friend class const_reverse_iterator;
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};
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}}
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#include <boost/property_tree/detail/ptree_implementation.hpp>
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#endif
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