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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 |