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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010, 2011 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 pat_trie_/erase_fn_imps.hpp

 * Contains an implementation class for pat_trie.

 */

PB_DS_CLASS_T_DEC

inline bool

PB_DS_CLASS_C_DEC::

erase(key_const_reference r_key)

{

  node_pointer p_nd = find_imp(r_key);

  if (p_nd == 0 || p_nd->m_type == i_node)

    {

      PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)

      return false;

    }

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == leaf_node);

  if (!synth_access_traits::equal_keys(PB_DS_V2F(reinterpret_cast<leaf_pointer>(p_nd)->value()), r_key))

    {

      PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)

      return false;

    }

  PB_DS_CHECK_KEY_EXISTS(r_key)

  erase_leaf(static_cast<leaf_pointer>(p_nd));

  PB_DS_ASSERT_VALID((*this))

  return true;

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

erase_fixup(inode_pointer p_nd)

{

  _GLIBCXX_DEBUG_ASSERT(std::distance(p_nd->begin(), p_nd->end()) >= 1);

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

    {

      node_pointer p_parent = p_nd->m_p_parent;

      if (p_parent == m_p_head)

        m_p_head->m_p_parent = *p_nd->begin();

      else

        {

          _GLIBCXX_DEBUG_ASSERT(p_parent->m_type == i_node);

          node_pointer p_new_child = *p_nd->begin();

          typedef inode_pointer inode_ptr;

          inode_ptr p_internal = static_cast<inode_ptr>(p_parent);

          p_internal->replace_child(p_new_child, pref_begin(p_new_child),

                                    pref_end(p_new_child), this);

        }

      (*p_nd->begin())->m_p_parent = p_nd->m_p_parent;

      p_nd->~inode();

      s_inode_allocator.deallocate(p_nd, 1);

      if (p_parent == m_p_head)

        return;

      _GLIBCXX_DEBUG_ASSERT(p_parent->m_type == i_node);

      p_nd = static_cast<inode_pointer>(p_parent);

    }

  while (true)

    {

      _GLIBCXX_DEBUG_ASSERT(std::distance(p_nd->begin(), p_nd->end()) > 1);

      p_nd->update_prefixes(this);

      apply_update(p_nd, (node_update*)this);

      PB_DS_ASSERT_NODE_VALID(p_nd)

      if (p_nd->m_p_parent->m_type == head_node)

        return;

      _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_parent->m_type == i_node);

      p_nd = static_cast<inode_pointer>(p_nd->m_p_parent);

    }

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

actual_erase_leaf(leaf_pointer p_l)

{

  _GLIBCXX_DEBUG_ASSERT(m_size > 0);

  --m_size;

  _GLIBCXX_DEBUG_ONLY(debug_base::erase_existing(PB_DS_V2F(p_l->value())));

  p_l->~leaf();

  s_leaf_allocator.deallocate(p_l, 1);

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

clear()

{

  if (!empty())

    {

      clear_imp(m_p_head->m_p_parent);

      m_size = 0;

      initialize();

      _GLIBCXX_DEBUG_ONLY(debug_base::clear();)

      PB_DS_ASSERT_VALID((*this))

    }

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

clear_imp(node_pointer p_nd)

{

  if (p_nd->m_type == i_node)

    {

      _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == i_node);

      for (typename inode::iterator it =

             static_cast<inode_pointer>(p_nd)->begin();

           it != static_cast<inode_pointer>(p_nd)->end();

           ++it)

        {

          node_pointer p_child =* it;

          clear_imp(p_child);

        }

      s_inode_allocator.deallocate(static_cast<inode_pointer>(p_nd), 1);

      return;

    }

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == leaf_node);

  static_cast<leaf_pointer>(p_nd)->~leaf();

  s_leaf_allocator.deallocate(static_cast<leaf_pointer>(p_nd), 1);

}

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::const_iterator

PB_DS_CLASS_C_DEC::

erase(const_iterator it)

{

  PB_DS_ASSERT_VALID((*this))

  if (it == end())

    return it;

  const_iterator ret_it = it;

  ++ret_it;

  _GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);

  erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));

  PB_DS_ASSERT_VALID((*this))

  return ret_it;

}

#ifdef PB_DS_DATA_TRUE_INDICATOR

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::iterator

PB_DS_CLASS_C_DEC::

erase(iterator it)

{

  PB_DS_ASSERT_VALID((*this))

  if (it == end())

    return it;

  iterator ret_it = it;

  ++ret_it;

  _GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);

  erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));

  PB_DS_ASSERT_VALID((*this))

  return ret_it;

}

#endif // #ifdef PB_DS_DATA_TRUE_INDICATOR

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::const_reverse_iterator

PB_DS_CLASS_C_DEC::

erase(const_reverse_iterator it)

{

  PB_DS_ASSERT_VALID((*this))

  if (it.m_p_nd == m_p_head)

    return it;

  const_reverse_iterator ret_it = it;

  ++ret_it;

  _GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);

  erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));

  PB_DS_ASSERT_VALID((*this))

  return ret_it;

}

#ifdef PB_DS_DATA_TRUE_INDICATOR

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::reverse_iterator

PB_DS_CLASS_C_DEC::

erase(reverse_iterator it)

{

  PB_DS_ASSERT_VALID((*this))

  if (it.m_p_nd == m_p_head)

    return it;

  reverse_iterator ret_it = it;

  ++ret_it;

  _GLIBCXX_DEBUG_ASSERT(it.m_p_nd->m_type == leaf_node);

  erase_leaf(static_cast<leaf_pointer>(it.m_p_nd));

  PB_DS_ASSERT_VALID((*this))

  return ret_it;

}

#endif // #ifdef PB_DS_DATA_TRUE_INDICATOR

PB_DS_CLASS_T_DEC

template<typename Pred>

inline typename PB_DS_CLASS_C_DEC::size_type

PB_DS_CLASS_C_DEC::

erase_if(Pred pred)

{

  size_type num_ersd = 0;

  PB_DS_ASSERT_VALID((*this))

  iterator it = begin();

  while (it != end())

    {

      PB_DS_ASSERT_VALID((*this))

      if (pred(*it))

        {

          ++num_ersd;

          it = erase(it);

        }

      else

        ++it;

    }

  PB_DS_ASSERT_VALID((*this))

  return num_ersd;

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

erase_leaf(leaf_pointer p_l)

{

  update_min_max_for_erased_leaf(p_l);

  if (p_l->m_p_parent->m_type == head_node)

    {

      _GLIBCXX_DEBUG_ASSERT(size() == 1);

      clear();

      return;

    }

  _GLIBCXX_DEBUG_ASSERT(size() > 1);

  _GLIBCXX_DEBUG_ASSERT(p_l->m_p_parent->m_type == i_node);

  inode_pointer p_parent = static_cast<inode_pointer>(p_l->m_p_parent);

  p_parent->remove_child(p_l);

  erase_fixup(p_parent);

  actual_erase_leaf(p_l);

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

update_min_max_for_erased_leaf(leaf_pointer p_l)

{

  if (m_size == 1)

    {

      m_p_head->m_p_min = m_p_head;

      m_p_head->m_p_max = m_p_head;

      return;

    }

  if (p_l == static_cast<leaf_const_pointer>(m_p_head->m_p_min))

    {

      iterator it(p_l);

      ++it;

      m_p_head->m_p_min = it.m_p_nd;

      return;

    }

  if (p_l == static_cast<leaf_const_pointer>(m_p_head->m_p_max))

    {

      iterator it(p_l);

      --it;

      m_p_head->m_p_max = it.m_p_nd;

    }

}