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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file split_fn_imps.hpp

 * Contains an implementation class for bin_search_tree_.

 */

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

split(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid(););

  _GLIBCXX_DEBUG_ONLY(other.assert_valid(););

  split_join_branch_bag bag;

  leaf_pointer p_split_lf = split_prep(r_key, other, bag);

  if (p_split_lf == NULL)

    {

      _GLIBCXX_DEBUG_ASSERT(bag.empty());

      _GLIBCXX_DEBUG_ONLY(assert_valid();)

      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

      return;

    }

  _GLIBCXX_DEBUG_ASSERT(!bag.empty());

  other.clear();

  m_p_head->m_p_parent = rec_split(m_p_head->m_p_parent,

                                   pref_begin(p_split_lf),

                                   pref_end(p_split_lf),

                                   other,

                                   bag);

  m_p_head->m_p_parent->m_p_parent = m_p_head;

  other.m_p_head->m_p_max = m_p_head->m_p_max;

  m_p_head->m_p_max = rightmost_descendant(m_p_head->m_p_parent);

  other.m_p_head->m_p_min =

    other.leftmost_descendant(other.m_p_head->m_p_parent);

  other.m_size = std::distance(other.PB_DS_CLASS_C_DEC::begin(),

                               other.PB_DS_CLASS_C_DEC::end());

  m_size -= other.m_size;

  _GLIBCXX_DEBUG_ONLY(assert_valid(););

  _GLIBCXX_DEBUG_ONLY(other.assert_valid(););

}

PB_DS_CLASS_T_DEC

typename PB_DS_CLASS_C_DEC::leaf_pointer

PB_DS_CLASS_C_DEC::

split_prep(const_key_reference r_key, PB_DS_CLASS_C_DEC& other, split_join_branch_bag& r_bag)

{

  _GLIBCXX_DEBUG_ASSERT(r_bag.empty());

  if (m_size == 0)

    {

      other.clear();

      _GLIBCXX_DEBUG_ONLY(assert_valid(););

      _GLIBCXX_DEBUG_ONLY(other.assert_valid(););

      return (NULL);

    }

  if (synth_e_access_traits::cmp_keys(r_key,

                                      PB_DS_V2F(static_cast<const_leaf_pointer>(m_p_head->m_p_min)->value())))

    {

      other.clear();

      value_swap(other);

      _GLIBCXX_DEBUG_ONLY(assert_valid(););

      _GLIBCXX_DEBUG_ONLY(other.assert_valid(););

      return (NULL);

    }

  if (!synth_e_access_traits::cmp_keys(r_key,

                                       PB_DS_V2F(static_cast<const_leaf_pointer>(m_p_head->m_p_max)->value())))

    {

      _GLIBCXX_DEBUG_ONLY(assert_valid(););

      _GLIBCXX_DEBUG_ONLY(other.assert_valid(););

      return (NULL);

    }

  iterator it = lower_bound(r_key);

  if (!synth_e_access_traits::equal_keys(PB_DS_V2F(*it), r_key))

    --it;

  node_pointer p_nd = it.m_p_nd;

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == pat_trie_leaf_node_type);

  leaf_pointer p_ret_l = static_cast<leaf_pointer>(p_nd);

  while (p_nd->m_type != pat_trie_head_node_type)

    {

      r_bag.add_branch();

      p_nd = p_nd->m_p_parent;

    }

  _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(synth_e_access_traits& )(*this), other);)

  return (p_ret_l);

}

PB_DS_CLASS_T_DEC

typename PB_DS_CLASS_C_DEC::node_pointer

PB_DS_CLASS_C_DEC::

rec_split(node_pointer p_nd, const_e_iterator b_it, const_e_iterator e_it, PB_DS_CLASS_C_DEC& other, split_join_branch_bag& r_bag)

{

  if (p_nd->m_type == pat_trie_leaf_node_type)

    {

      _GLIBCXX_DEBUG_ASSERT(other.m_p_head->m_p_parent == NULL);

      return (p_nd);

    }

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == pat_trie_internal_node_type);

  internal_node_pointer p_internal_nd = static_cast<internal_node_pointer>(p_nd);

  node_pointer p_child_ret = rec_split(p_internal_nd->get_child_node(b_it, e_it, this), b_it, e_it, other, r_bag);

  _GLIBCXX_DEBUG_ONLY(p_child_ret->assert_valid(this);)

  p_internal_nd->replace_child(p_child_ret, b_it, e_it, this);

  apply_update(p_internal_nd, (node_update* )this);

  typename internal_node::iterator child_it  =

    p_internal_nd->get_child_it(b_it, e_it, this);

  const size_type lhs_num_children =

    std::distance(p_internal_nd->begin(), child_it) + 1;

  _GLIBCXX_DEBUG_ASSERT(lhs_num_children > 0);

  size_type rhs_num_children =

    std::distance(p_internal_nd->begin(), p_internal_nd->end()) -

    lhs_num_children;

  if (rhs_num_children == 0)

    {

      apply_update(p_internal_nd, (node_update* )this);

      return (p_internal_nd);

    }

  ++child_it;

  other.split_insert_branch(p_internal_nd->get_e_ind(),

                            b_it, child_it, rhs_num_children, r_bag);

  child_it = p_internal_nd->get_child_it(b_it, e_it, this);

  ++child_it;

  while (rhs_num_children != 0)

    {

      child_it = p_internal_nd->remove_child(child_it);

      --rhs_num_children;

    }

  apply_update(p_internal_nd, (node_update* )this);

  _GLIBCXX_DEBUG_ASSERT(std::distance(p_internal_nd->begin(),

                                      p_internal_nd->end()) >= 1);

  if (std::distance(p_internal_nd->begin(), p_internal_nd->end()) > 1)

    {

      p_internal_nd->update_prefixes(this);

      _GLIBCXX_DEBUG_ONLY(p_internal_nd->assert_valid(this);)

      apply_update(p_internal_nd, (node_update* )this);

      return (p_internal_nd);

    }

  node_pointer p_ret =* p_internal_nd->begin();

  p_internal_nd->~internal_node();

  s_internal_node_allocator.deallocate(p_internal_nd, 1);

  apply_update(p_ret, (node_update* )this);

  return (p_ret);

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

split_insert_branch(size_type e_ind, const_e_iterator b_it, typename internal_node::iterator child_b_it, size_type num_children, split_join_branch_bag& r_bag)

{

#ifdef _GLIBCXX_DEBUG

  if (m_p_head->m_p_parent != NULL)

    m_p_head->m_p_parent->assert_valid(this);

#endif 

  const size_type total_num_children =((m_p_head->m_p_parent == NULL)? 0 : 1) + num_children;

  if (total_num_children == 0)

    {

      _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_parent == NULL);

      return;

    }

  if (total_num_children == 1)

    {

      if (m_p_head->m_p_parent != NULL)

        {

          _GLIBCXX_DEBUG_ONLY(m_p_head->m_p_parent->assert_valid(this);)

          return;

        }

      _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_parent == NULL);

      m_p_head->m_p_parent =* child_b_it;

      m_p_head->m_p_parent->m_p_parent = m_p_head;

      apply_update(m_p_head->m_p_parent, (node_update* )this);

      _GLIBCXX_DEBUG_ONLY(m_p_head->m_p_parent->assert_valid(this);)

      return;

    }

  _GLIBCXX_DEBUG_ASSERT(total_num_children > 1);

  internal_node_pointer p_new_root = r_bag.get_branch();

  new (p_new_root) internal_node(e_ind, b_it);

  size_type num_inserted = 0;

  while (num_inserted++ < num_children)

    {

      _GLIBCXX_DEBUG_ONLY((*child_b_it)->assert_valid(this);)

        p_new_root->add_child(*child_b_it, pref_begin(*child_b_it),

                              pref_end(*child_b_it), this);

      ++child_b_it;

    }

  if (m_p_head->m_p_parent != NULL)

    p_new_root->add_child(m_p_head->m_p_parent,

                          pref_begin(m_p_head->m_p_parent),

                          pref_end(m_p_head->m_p_parent), this);

  m_p_head->m_p_parent = p_new_root;

  p_new_root->m_p_parent = m_p_head;

  apply_update(m_p_head->m_p_parent, (node_update* )this);

  _GLIBCXX_DEBUG_ONLY(m_p_head->m_p_parent->assert_valid(this);)

}