tree.h

著名的标准C＋＋的html解析器

   : iterator_base(0)
   {
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::post_order_iterator::post_order_iterator(tree_node *tn)
   : iterator_base(tn)
   {
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::post_order_iterator::post_order_iterator(const iterator_base &other)
   : iterator_base(other.node)
   {
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::post_order_iterator::post_order_iterator(const sibling_iterator& other)
   : iterator_base(other.node)
   {
   if(this->node==0) {
      if(other.range_last()!=0)
         this->node=other.range_last();
      else 
         this->node=other.parent_;
      this->skip_children();
      ++(*this);
      }
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator& tree<T, tree_node_allocator>::post_order_iterator::operator++()
   {
   assert(this->node!=0);
   if(this->node->next_sibling==0) 
      this->node=this->node->parent;
   else {
      this->node=this->node->next_sibling;
      if(this->skip_current_children_) {
         this->skip_current_children_=false;
         }
      else {
         while(this->node->first_child)
            this->node=this->node->first_child;
         }
      }
   return *this;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator& tree<T, tree_node_allocator>::post_order_iterator::operator--()
   {
   assert(this->node!=0);
   if(this->skip_current_children_ || this->node->last_child==0) {
      this->skip_current_children_=false;
      while(this->node->prev_sibling==0)
         this->node=this->node->parent;
      this->node=this->node->prev_sibling;
      }
   else {
      this->node=this->node->last_child;
      }
   return *this;
}

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator tree<T, tree_node_allocator>::post_order_iterator::operator++(int)
   {
   post_order_iterator copy = *this;
   ++(*this);
   return copy;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator tree<T, tree_node_allocator>::post_order_iterator::operator--(int)
   {
   post_order_iterator copy = *this;
   --(*this);
   return copy;
   }


template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator& tree<T, tree_node_allocator>::post_order_iterator::operator+=(unsigned int num)
   {
   while(num>0) {
      ++(*this);
      --num;
      }
   return (*this);
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::post_order_iterator& tree<T, tree_node_allocator>::post_order_iterator::operator-=(unsigned int num)
   {
   while(num>0) {
      --(*this);
      --num;
      }
   return (*this);
   }

template <class T, class tree_node_allocator>
void tree<T, tree_node_allocator>::post_order_iterator::descend_all()
   {
   assert(this->node!=0);
   while(this->node->first_child)
      this->node=this->node->first_child;
   }


// Fixed depth iterator

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::fixed_depth_iterator::fixed_depth_iterator()
   : iterator_base()
   {
   set_first_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::fixed_depth_iterator::fixed_depth_iterator(tree_node *tn)
   : iterator_base(tn)
   {
   set_first_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::fixed_depth_iterator::fixed_depth_iterator(const iterator_base& other)
   : iterator_base(other.node)
   {
   set_first_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::fixed_depth_iterator::fixed_depth_iterator(const sibling_iterator& other)
   : iterator_base(other.node), first_parent_(other.parent_)
   {
   find_leftmost_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::fixed_depth_iterator::fixed_depth_iterator(const fixed_depth_iterator& other)
   : iterator_base(other.node), first_parent_(other.first_parent_)
   {
   }

template <class T, class tree_node_allocator>
void tree<T, tree_node_allocator>::fixed_depth_iterator::set_first_parent_()
   {
   return; // FIXME: we do not use first_parent_ yet, and it actually needs some serious reworking if
           // it is ever to work at the 'head' level.
   first_parent_=0;
   if(this->node==0) return;
   if(this->node->parent!=0)
      first_parent_=this->node->parent;
   if(first_parent_)
      find_leftmost_parent_();
   }

template <class T, class tree_node_allocator>
void tree<T, tree_node_allocator>::fixed_depth_iterator::find_leftmost_parent_()
   {
   return; // FIXME: see 'set_first_parent()'
   tree_node *tmppar=first_parent_;
   while(tmppar->prev_sibling) {
      tmppar=tmppar->prev_sibling;
      if(tmppar->first_child)
         first_parent_=tmppar;
      }
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator& tree<T, tree_node_allocator>::fixed_depth_iterator::operator++()
   {
   assert(this->node!=0);

   if(this->node->next_sibling) {
      this->node=this->node->next_sibling;
      }
   else { 
      int relative_depth=0;
      upper:
      do {
         this->node=this->node->parent;
         if(this->node==0) return *this;
         --relative_depth;
         } while(this->node->next_sibling==0);
      lower:
      this->node=this->node->next_sibling;
      while(this->node->first_child==0) {
         if(this->node->next_sibling==0)
            goto upper;
         this->node=this->node->next_sibling;
         if(this->node==0) return *this;
         }
      while(relative_depth<0 && this->node->first_child!=0) {
         this->node=this->node->first_child;
         ++relative_depth;
         }
      if(relative_depth<0) {
         if(this->node->next_sibling==0) goto upper;
         else                          goto lower;
         }
      }
   return *this;

// if(this->node->next_sibling!=0) {
//    this->node=this->node->next_sibling;
//    assert(this->node!=0);
//    if(this->node->parent==0 && this->node->next_sibling==0) // feet element
//       this->node=0;
//    }
// else {
//    tree_node *par=this->node->parent;
//    do {
//       par=par->next_sibling;
//       if(par==0) { // FIXME: need to keep track of this!
//          this->node=0;
//          return *this;
//          }
//       } while(par->first_child==0);
//    this->node=par->first_child;
//    }
   return *this;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator& tree<T, tree_node_allocator>::fixed_depth_iterator::operator--()
   {
   assert(this->node!=0);
   if(this->node->prev_sibling!=0) {
      this->node=this->node->prev_sibling;
      assert(this->node!=0);
      if(this->node->parent==0 && this->node->prev_sibling==0) // head element
         this->node=0;
      }
   else {
      tree_node *par=this->node->parent;
      do {
         par=par->prev_sibling;
         if(par==0) { // FIXME: need to keep track of this!
            this->node=0;
            return *this;
            }
         } while(par->last_child==0);
      this->node=par->last_child;
      }
   return *this;
}

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator tree<T, tree_node_allocator>::fixed_depth_iterator::operator++(int)
   {
   fixed_depth_iterator copy = *this;
   ++(*this);
   return copy;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator tree<T, tree_node_allocator>::fixed_depth_iterator::operator--(int)
{
  fixed_depth_iterator copy = *this;
  --(*this);
  return copy;
}

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator& tree<T, tree_node_allocator>::fixed_depth_iterator::operator-=(unsigned int num)
   {
   while(num>0) {
      --(*this);
      --(num);
      }
   return (*this);
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::fixed_depth_iterator& tree<T, tree_node_allocator>::fixed_depth_iterator::operator+=(unsigned int num)
   {
   while(num>0) {
      ++(*this);
      --(num);
      }
   return *this;
   }

// FIXME: add the other members of fixed_depth_iterator.


// Sibling iterator

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::sibling_iterator::sibling_iterator() 
   : iterator_base()
   {
   set_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::sibling_iterator::sibling_iterator(tree_node *tn)
   : iterator_base(tn)
   {
   set_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::sibling_iterator::sibling_iterator(const iterator_base& other)
   : iterator_base(other.node)
   {
   set_parent_();
   }

template <class T, class tree_node_allocator>
tree<T, tree_node_allocator>::sibling_iterator::sibling_iterator(const sibling_iterator& other)
   : iterator_base(other), parent_(other.parent_)
   {
   }

template <class T, class tree_node_allocator>
void tree<T, tree_node_allocator>::sibling_iterator::set_parent_()
   {
   parent_=0;
   if(this->node==0) return;
   if(this->node->parent!=0)
      parent_=this->node->parent;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator& tree<T, tree_node_allocator>::sibling_iterator::operator++()
   {
   if(this->node)
      this->node=this->node->next_sibling;
   return *this;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator& tree<T, tree_node_allocator>::sibling_iterator::operator--()
   {
   if(this->node) this->node=this->node->prev_sibling;
   else {
      assert(parent_);
      this->node=parent_->last_child;
      }
   return *this;
}

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator tree<T, tree_node_allocator>::sibling_iterator::operator++(int)
   {
   sibling_iterator copy = *this;
   ++(*this);
   return copy;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator tree<T, tree_node_allocator>::sibling_iterator::operator--(int)
   {
   sibling_iterator copy = *this;
   --(*this);
   return copy;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator& tree<T, tree_node_allocator>::sibling_iterator::operator+=(unsigned int num)
   {
   while(num>0) {
      ++(*this);
      --num;
      }
   return (*this);
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::sibling_iterator& tree<T, tree_node_allocator>::sibling_iterator::operator-=(unsigned int num)
   {
   while(num>0) {
      --(*this);
      --num;
      }
   return (*this);
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::tree_node *tree<T, tree_node_allocator>::sibling_iterator::range_first() const
   {
   tree_node *tmp=parent_->first_child;
   return tmp;
   }

template <class T, class tree_node_allocator>
typename tree<T, tree_node_allocator>::tree_node *tree<T, tree_node_allocator>::sibling_iterator::range_last() const
   {
   return parent_->last_child;
   }


#endif

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