pv/views/trace/viewitemiterator.hpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2014 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
  21 #define PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
  22
  23 #include <algorithm>
  24 #include <cassert>
  25 #include <iterator>
  26 #include <memory>
  27 #include <stack>
  28 #include <type_traits>
  29 #include <vector>
  30
  31 #include <pv/session.hpp>
  32
  33 using std::dynamic_pointer_cast;
  34 using std::forward_iterator_tag;
  35 using std::shared_ptr;
  36 using std::stack;
  37
  38 namespace pv {
  39 namespace views {
  40 namespace trace {
  41
  42 template<class Owner, class Item> class ViewItemIterator
  43 {
  44 public:
  45         typedef typename Owner::item_list::const_iterator child_iterator;
  46         typedef shared_ptr<Item> value_type;
  47         typedef ptrdiff_t difference_type;
  48         typedef value_type pointer;
  49         typedef const value_type& reference;
  50         typedef forward_iterator_tag iterator_category;
  51
  52 public:
  53         ViewItemIterator(Owner *owner) :
  54                 owner_stack_({owner}) {}
  55
  56         ViewItemIterator(Owner *owner, child_iterator iter) :
  57                 owner_stack_({owner}) {
  58                 assert(owner);
  59                 if (iter != owner->child_items().end())
  60                         iter_stack_.push(iter);
  61         }
  62
  63         ViewItemIterator(const ViewItemIterator<Owner, Item> &o) :
  64                 owner_stack_(o.owner_stack_),
  65                 iter_stack_(o.iter_stack_) {}
  66
  67         reference operator*() const {
  68                 return *iter_stack_.top();
  69         }
  70
  71         reference operator->() const {
  72                 return *this;
  73         }
  74
  75         ViewItemIterator<Owner, Item>& operator++() {
  76                 assert(!owner_stack_.empty());
  77                 assert(!iter_stack_.empty());
  78
  79                 shared_ptr<Owner> owner(dynamic_pointer_cast<Owner>(
  80                         *iter_stack_.top()));
  81                 if (owner && !owner->child_items().empty()) {
  82                         owner_stack_.push(owner.get());
  83                         iter_stack_.push(owner->child_items().begin());
  84                 } else {
  85                         while (!iter_stack_.empty() && (++iter_stack_.top()) ==
  86                                 owner_stack_.top()->child_items().end()) {
  87                                 owner_stack_.pop();
  88                                 iter_stack_.pop();
  89                         }
  90                 }
  91
  92                 return *this;
  93         }
  94
  95         ViewItemIterator<Owner, Item> operator++(int) {
  96                 ViewItemIterator<Owner, Item> pre = *this;
  97                 ++*this;
  98                 return pre;
  99         }
 100
 101         bool operator==(const ViewItemIterator &o) const {
 102                 return (iter_stack_.empty() && o.iter_stack_.empty()) || (
 103                         iter_stack_.size() == o.iter_stack_.size() &&
 104                         owner_stack_.top() == o.owner_stack_.top() &&
 105                         iter_stack_.top() == o.iter_stack_.top());
 106         }
 107
 108         bool operator!=(const ViewItemIterator &o) const {
 109                 return !((const ViewItemIterator&)*this == o);
 110         }
 111
 112         void swap(ViewItemIterator<Owner, Item>& other) {
 113                 swap(owner_stack_, other.owner_stack_);
 114                 swap(iter_stack_, other.iter_stack_);
 115         }
 116
 117 private:
 118         stack<Owner*> owner_stack_;
 119         stack<child_iterator> iter_stack_;
 120 };
 121
 122 template<class Owner, class Item>
 123 void swap(ViewItemIterator<Owner, Item>& a, ViewItemIterator<Owner, Item>& b)
 124 {
 125         a.swap(b);
 126 }
 127
 128 } // namespace trace
 129 } // namespace views
 130 } // namespace pv
 131
 132 #endif // PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP