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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 splay_fn_imps.hpp

 * Contains an implementation class for splay_tree_.

 */

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

splay(node_pointer p_nd)

{

  while (p_nd->m_p_parent != base_type::m_p_head)

    {

#ifdef _GLIBCXX_DEBUG

      {

        node_pointer p_head = base_type::m_p_head;

        assert_special_imp(p_head);

      }

#endif

      _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)

        if (p_nd->m_p_parent->m_p_parent == base_type::m_p_head)

          {

            base_type::rotate_parent(p_nd);

            _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);

          }

        else

          {

            const node_pointer p_parent = p_nd->m_p_parent;

            const node_pointer p_grandparent = p_parent->m_p_parent;

#ifdef _GLIBCXX_DEBUG

            const size_type total =

              base_type::recursive_count(p_grandparent);

            _GLIBCXX_DEBUG_ASSERT(total >= 3);

#endif 

            if (p_parent->m_p_left == p_nd &&

                p_grandparent->m_p_right == p_parent)

              splay_zig_zag_left(p_nd, p_parent, p_grandparent);

            else if (p_parent->m_p_right == p_nd &&

                     p_grandparent->m_p_left == p_parent)

              splay_zig_zag_right(p_nd, p_parent, p_grandparent);

            else if (p_parent->m_p_left == p_nd &&

                     p_grandparent->m_p_left == p_parent)

              splay_zig_zig_left(p_nd, p_parent, p_grandparent);

            else

              splay_zig_zig_right(p_nd, p_parent, p_grandparent);

            _GLIBCXX_DEBUG_ASSERT(total ==this->recursive_count(p_nd));

          }

      _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)

  }

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zig_zag_left(node_pointer p_nd, node_pointer p_parent,

                   node_pointer p_grandparent)

{

  _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);

  _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)

  _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd &&

                        p_grandparent->m_p_right == p_parent);

  splay_zz_start(p_nd, p_parent, p_grandparent);

  node_pointer p_b = p_nd->m_p_right;

  node_pointer p_c = p_nd->m_p_left;

  p_nd->m_p_right = p_parent;

  p_parent->m_p_parent = p_nd;

  p_nd->m_p_left = p_grandparent;

  p_grandparent->m_p_parent = p_nd;

  p_parent->m_p_left = p_b;

  if (p_b != NULL)

    p_b->m_p_parent = p_parent;

  p_grandparent->m_p_right = p_c;

  if (p_c != NULL)

    p_c->m_p_parent = p_grandparent;

  splay_zz_end(p_nd, p_parent, p_grandparent);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zig_zag_right(node_pointer p_nd, node_pointer p_parent,

                    node_pointer p_grandparent)

{

  _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);

  _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)

  _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd &&

                        p_grandparent->m_p_left == p_parent);

  splay_zz_start(p_nd, p_parent, p_grandparent);

  node_pointer p_b = p_nd->m_p_left;

  node_pointer p_c = p_nd->m_p_right;

  p_nd->m_p_left = p_parent;

  p_parent->m_p_parent = p_nd;

  p_nd->m_p_right = p_grandparent;

  p_grandparent->m_p_parent = p_nd;

  p_parent->m_p_right = p_b;

  if (p_b != NULL)

    p_b->m_p_parent = p_parent;

  p_grandparent->m_p_left = p_c;

  if (p_c != NULL)

    p_c->m_p_parent = p_grandparent;

  splay_zz_end(p_nd, p_parent, p_grandparent);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zig_zig_left(node_pointer p_nd, node_pointer p_parent,

                   node_pointer p_grandparent)

{

  _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);

  _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)

  _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd &&

                     p_nd->m_p_parent->m_p_parent->m_p_left == p_nd->m_p_parent);

  splay_zz_start(p_nd, p_parent, p_grandparent);

  node_pointer p_b = p_nd->m_p_right;

  node_pointer p_c = p_parent->m_p_right;

  p_nd->m_p_right = p_parent;

  p_parent->m_p_parent = p_nd;

  p_parent->m_p_right = p_grandparent;

  p_grandparent->m_p_parent = p_parent;

  p_parent->m_p_left = p_b;

  if (p_b != NULL)

    p_b->m_p_parent = p_parent;

  p_grandparent->m_p_left = p_c;

  if (p_c != NULL)

    p_c->m_p_parent = p_grandparent;

  splay_zz_end(p_nd, p_parent, p_grandparent);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zig_zig_right(node_pointer p_nd, node_pointer p_parent,

                    node_pointer p_grandparent)

{

  _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);

  _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)

  _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd &&

                  p_nd->m_p_parent->m_p_parent->m_p_right == p_nd->m_p_parent);

  splay_zz_start(p_nd, p_parent, p_grandparent);

  node_pointer p_b = p_nd->m_p_left;

  node_pointer p_c = p_parent->m_p_left;

  p_nd->m_p_left = p_parent;

  p_parent->m_p_parent = p_nd;

  p_parent->m_p_left = p_grandparent;

  p_grandparent->m_p_parent = p_parent;

  p_parent->m_p_right = p_b;

  if (p_b != NULL)

    p_b->m_p_parent = p_parent;

  p_grandparent->m_p_right = p_c;

  if (p_c != NULL)

    p_c->m_p_parent = p_grandparent;

  base_type::update_to_top(p_grandparent, (node_update* )this);

  splay_zz_end(p_nd, p_parent, p_grandparent);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zz_start(node_pointer p_nd,

#ifdef _GLIBCXX_DEBUG

               node_pointer p_parent,

#else 

               node_pointer /*p_parent*/,

#endif

               node_pointer p_grandparent)

{

  _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);

  _GLIBCXX_DEBUG_ASSERT(p_parent != NULL);

  _GLIBCXX_DEBUG_ASSERT(p_grandparent != NULL);

  const bool grandparent_head = p_grandparent->m_p_parent == base_type::m_p_head;

  if (grandparent_head)

    {

      base_type::m_p_head->m_p_parent = base_type::m_p_head->m_p_parent;

      p_nd->m_p_parent = base_type::m_p_head;

      return;

    }

  node_pointer p_greatgrandparent = p_grandparent->m_p_parent;

  p_nd->m_p_parent = p_greatgrandparent;

  if (p_grandparent == p_greatgrandparent->m_p_left)

    p_greatgrandparent->m_p_left = p_nd;

  else

    p_greatgrandparent->m_p_right = p_nd;

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

splay_zz_end(node_pointer p_nd, node_pointer p_parent,

             node_pointer p_grandparent)

{

  if (p_nd->m_p_parent == base_type::m_p_head)

    base_type::m_p_head->m_p_parent = p_nd;

  apply_update(p_grandparent, (node_update* )this);

  apply_update(p_parent, (node_update* )this);

  apply_update(p_nd, (node_update* )this);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)

}