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/***************************************************************************
begin : Wed Jan 29 2003
copyright : (C) 2003 - 2004 by Scott Wheeler
email : wheeler@kde.org
***************************************************************************/
/***************************************************************************
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <kdebug.h>
#include "sortedstringlist.h"
class SortedStringList::Node
{
public:
Node(const TQString &value) : key(value), parent(0), left(0), right(0) {}
~Node() {}
TQString key;
Node *parent;
Node *left;
Node *right;
};
SortedStringList::SortedStringList() : m_root(0)
{
}
SortedStringList::~SortedStringList()
{
}
bool SortedStringList::insert(const TQString &value)
{
return BSTInsert(value);
}
bool SortedStringList::contains(const TQString &value) const
{
return find(value);
}
SortedStringList::Node *SortedStringList::treeMinimum(Node *n) const
{
while(n->left)
n = n->left;
return n;
}
SortedStringList::Node *SortedStringList::treeSuccessor(Node *n) const
{
if(n->right)
return treeMinimum(n->right);
Node *p = n->parent;
while(p && n == p->right) {
n = p;
p = p->parent;
}
return p;
}
bool SortedStringList::remove(const TQString &value)
{
Node *n = find(value);
if(!n)
return false;
Node *y;
Node *x;
if(!n->left || !n->right)
y = n;
else
y = treeSuccessor(n);
if(y->left)
x = y->left;
else
x = y->right;
if(x)
x->parent = y->parent;
if(!y->parent)
m_root = x;
else {
if(y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
}
if(y != x)
n->key = y->key;
delete y;
return true;
}
TQStringList SortedStringList::values() const
{
TQStringList l;
traverse(m_root, l);
return l;
}
////////////////////////////////////////////////////////////////////////////////
// private methods
////////////////////////////////////////////////////////////////////////////////
SortedStringList::Node *SortedStringList::find(const TQString &value) const
{
Node *n = m_root;
while(n && value != n->key) {
if(value < n->key)
n = n->left;
else
n = n->right;
}
return n;
}
bool SortedStringList::BSTInsert(const TQString &value)
{
Node *previousNode = 0;
Node *node = m_root;
while(node) {
previousNode = node;
if(value == node->key)
return true;
else if(value < node->key)
node = node->left;
else
node = node->right;
}
if(previousNode && value == previousNode->key)
return true;
Node *n = new Node(value);
n->parent = previousNode;
if(!m_root)
m_root = n;
else {
if(value < previousNode->key)
previousNode->left = n;
else
previousNode->right = n;
}
return false;
}
void SortedStringList::traverse(const Node *n, TQStringList &list) const
{
if(!n)
return;
traverse(n->left, list);
list.append(n->key);
traverse(n->right, list);
}
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