/Src/Dependencies/Boost/boost/spirit/home/classic/tree/impl/parse_tree_utils.ipp

  1/*=============================================================================
  2    Copyright (c) 2001-2007 Hartmut Kaiser
  3    Copyright (c) 2001-2003 Daniel Nuffer
  4    http://spirit.sourceforge.net/
  5
  6    Use, modification and distribution is subject to the Boost Software
  7    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  8    http://www.boost.org/LICENSE_1_0.txt)
  9=============================================================================*/
 10
 11#if !defined(PARSE_TREE_UTILS_IPP)
 12#define PARSE_TREE_UTILS_IPP
 13
 14///////////////////////////////////////////////////////////////////////////////
 15namespace boost {
 16namespace spirit {
 17
 18BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
 19
 20///////////////////////////////////////////////////////////////////////////////
 21//
 22//  Returnes the first leaf node of the given parsetree.
 23//
 24///////////////////////////////////////////////////////////////////////////////
 25template <typename T>
 26inline tree_node<T> const &
 27get_first_leaf (tree_node<T> const &node)
 28{
 29    if (node.children.size() > 0)
 30        return get_first_leaf(*node.children.begin());
 31    return node;
 32}
 33
 34///////////////////////////////////////////////////////////////////////////////
 35//
 36//  Find a specified node through recursive search.
 37//
 38///////////////////////////////////////////////////////////////////////////////
 39template <typename T>
 40inline bool
 41find_node (tree_node<T> const &node, parser_id node_to_search,
 42    tree_node<T> const **found_node)
 43{
 44    if (node.value.id() == node_to_search) {
 45        *found_node = &node;
 46        return true;
 47    }
 48    if (node.children.size() > 0) {
 49        typedef typename tree_node<T>::const_tree_iterator const_tree_iterator;
 50
 51        const_tree_iterator end = node.children.end();
 52        for (const_tree_iterator it = node.children.begin(); it != end; ++it)
 53        {
 54            if (find_node (*it, node_to_search, found_node))
 55                return true;
 56        }
 57    }
 58    return false;   // not found here
 59}
 60
 61///////////////////////////////////////////////////////////////////////////////
 62//
 63//  The functions 'get_node_range' return a pair of iterators pointing at the
 64//  range, which containes the elements of a specified node.
 65//
 66///////////////////////////////////////////////////////////////////////////////
 67namespace impl {
 68
 69template <typename T>
 70inline bool
 71get_node_range (typename tree_node<T>::const_tree_iterator const &start,
 72    parser_id node_to_search,
 73    std::pair<typename tree_node<T>::const_tree_iterator,
 74        typename tree_node<T>::const_tree_iterator> &nodes)
 75{
 76// look at this node first
 77tree_node<T> const &node = *start;
 78
 79    if (node.value.id() == node_to_search) {
 80        if (node.children.size() > 0) {
 81        // full subrange
 82            nodes.first = node.children.begin();
 83            nodes.second = node.children.end();
 84        }
 85        else {
 86        // only this node
 87            nodes.first = start;
 88            nodes.second = start;
 89            std::advance(nodes.second, 1);
 90        }
 91        return true;
 92    }
 93
 94// look at subnodes now
 95    if (node.children.size() > 0) {
 96        typedef typename tree_node<T>::const_tree_iterator const_tree_iterator;
 97
 98        const_tree_iterator end = node.children.end();
 99        for (const_tree_iterator it = node.children.begin(); it != end; ++it)
100        {
101            if (impl::get_node_range<T>(it, node_to_search, nodes))
102                return true;
103        }
104    }
105    return false;
106}
107
108} // end of namespace impl
109
110template <typename T>
111inline bool
112get_node_range (tree_node<T> const &node, parser_id node_to_search,
113    std::pair<typename tree_node<T>::const_tree_iterator,
114        typename tree_node<T>::const_tree_iterator> &nodes)
115{
116    if (node.children.size() > 0) {
117        typedef typename tree_node<T>::const_tree_iterator const_tree_iterator;
118
119        const_tree_iterator end = node.children.end();
120        for (const_tree_iterator it = node.children.begin(); it != end; ++it)
121        {
122            if (impl::get_node_range<T>(it, node_to_search, nodes))
123                return true;
124        }
125    }
126    return false;
127}
128
129///////////////////////////////////////////////////////////////////////////////
130BOOST_SPIRIT_CLASSIC_NAMESPACE_END
131
132}   // namespace spirit
133}   // namespace boost
134
135#endif // !defined(PARSE_TREE_UTILS_IPP)