tree.cpp
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/*=============================================================================
Copyright (c) 2017 Daniel James
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#include "tree.hpp"
#include <cassert>
namespace quickbook
{
namespace detail
{
void tree_node_base::add_before(tree_base* t)
{
assert(
t->root_ && !t->root_->parent_ && !t->root_->prev_ &&
!t->root_->next_);
t->root_->parent_ = this->parent_;
t->root_->next_ = this;
if (this->prev_) {
t->root_->prev_ = this->prev_;
this->prev_->next_ = t->root_;
}
else {
this->parent_->children_ = t->root_;
}
this->prev_ = t->root_;
t->root_ = 0;
}
void tree_node_base::add_after(tree_base* t)
{
assert(
t->root_ && !t->root_->parent_ && !t->root_->prev_ &&
!t->root_->next_);
t->root_->parent_ = this->parent_;
t->root_->prev_ = this;
t->root_->next_ = this->next_;
if (this->next_) this->next_->prev_ = t->root_;
this->next_ = t->root_;
t->root_ = 0;
}
void tree_node_base::add_first_child(tree_base* t)
{
assert(
t->root_ && !t->root_->parent_ && !t->root_->prev_ &&
!t->root_->next_);
t->root_->parent_ = this;
t->root_->next_ = this->children_;
if (this->children_) {
this->children_->prev_ = t->root_;
}
this->children_ = t->root_;
t->root_ = 0;
}
void tree_node_base::add_last_child(tree_base* t)
{
assert(
t->root_ && !t->root_->parent_ && !t->root_->prev_ &&
!t->root_->next_);
t->root_->parent_ = this;
if (!this->children_) {
this->children_ = t->root_;
}
else {
auto it = this->children_;
while (it->next_) {
it = it->next_;
}
t->root_->prev_ = it;
it->next_ = t->root_;
}
t->root_ = 0;
}
tree_base::tree_base() : root_(0) {}
tree_base::tree_base(tree_node_base* r) : root_(r) {}
tree_base::~tree_base() {}
tree_base::tree_base(tree_base&& x) : root_(x.root_) { x.root_ = 0; }
tree_base& tree_base::operator=(tree_base&& x)
{
root_ = x.root_;
x.root_ = 0;
return *this;
}
tree_node_base* tree_base::extract(tree_node_base* x)
{
if (!x->prev_) {
if (x->parent_) {
x->parent_->children_ = x->next_;
}
else {
assert(x == root_);
root_ = x->next_;
}
}
else {
x->prev_->next_ = x->next_;
}
if (x->next_) {
x->next_->prev_ = x->prev_;
}
x->parent_ = 0;
x->next_ = 0;
x->prev_ = 0;
return x;
}
tree_builder_base::tree_builder_base()
: tree_base(), current_(0), parent_(0)
{
}
tree_builder_base::tree_builder_base(tree_builder_base&& x)
: tree_base(std::move(x)), current_(x.current_), parent_(x.parent_)
{
x.current_ = 0;
x.parent_ = 0;
}
tree_builder_base& tree_builder_base::operator=(tree_builder_base&& x)
{
root_ = x.root_;
current_ = x.current_;
parent_ = x.parent_;
x.root_ = 0;
x.current_ = 0;
x.parent_ = 0;
return *this;
}
// Nodes are deleted in the subclass, which knows their type.
tree_builder_base::~tree_builder_base() {}
tree_node_base* tree_builder_base::extract(tree_node_base* x)
{
if (!x->prev_) {
if (x->parent_) {
x->parent_->children_ = x->next_;
}
else {
assert(x == root_);
root_ = x->next_;
parent_ = 0;
current_ = root_;
}
}
else {
x->prev_->next_ = x->next_;
}
if (x->next_) {
x->next_->prev_ = x->prev_;
}
x->parent_ = 0;
x->next_ = 0;
x->prev_ = 0;
return x;
}
tree_node_base* tree_builder_base::release()
{
tree_node_base* n = root_;
root_ = 0;
current_ = 0;
parent_ = 0;
return n;
}
void tree_builder_base::add_element(tree_node_base* n)
{
n->parent_ = parent_;
n->prev_ = current_;
if (current_) {
current_->next_ = n;
}
else if (parent_) {
parent_->children_ = n;
}
else {
root_ = n;
}
current_ = n;
}
void tree_builder_base::start_children()
{
parent_ = current_;
current_ = 0;
}
void tree_builder_base::end_children()
{
current_ = parent_;
parent_ = current_->parent_;
}
}
}