viewitemiterator.hpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2014 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifndef PULSEVIEW_PV_VIEW_VIEWITEMITERATOR_HPP
#define PULSEVIEW_PV_VIEW_VIEWITEMITERATOR_HPP

#include <algorithm>
#include <cassert>
#include <iterator>
#include <memory>
#include <stack>
#include <type_traits>
#include <vector>

#include <pv/session.hpp>

namespace pv {
namespace view {

template<class Owner, class Item> class ViewItemIterator
{
public:
    typedef typename Owner::item_list::const_iterator child_iterator;
    typedef std::shared_ptr<Item> value_type;
    typedef ptrdiff_t difference_type;
    typedef value_type pointer;
    typedef const value_type& reference;
    typedef std::forward_iterator_tag iterator_category;

public:
    ViewItemIterator(Owner *owner) :
        owner_stack_({owner}) {}

    ViewItemIterator(Owner *owner, child_iterator iter) :
        owner_stack_({owner}) {
        assert(owner);
        if (iter != owner->child_items().end())
            iter_stack_.push(iter);
    }

    ViewItemIterator(const ViewItemIterator<Owner, Item> &o) :
        owner_stack_(o.owner_stack_),
        iter_stack_(o.iter_stack_) {}

    reference operator*() const {
        return *iter_stack_.top();
    }

    reference operator->() const {
        return *this;
    }

    ViewItemIterator<Owner, Item>& operator++() {
        using std::dynamic_pointer_cast;
        using std::shared_ptr;

        assert(!owner_stack_.empty());
        assert(!iter_stack_.empty());

        shared_ptr<Owner> owner(dynamic_pointer_cast<Owner>(
            *iter_stack_.top()));
        if (owner && !owner->child_items().empty()) {
            owner_stack_.push(owner.get());
            iter_stack_.push(owner->child_items().begin());
        } else {
            while (!iter_stack_.empty() && (++iter_stack_.top()) ==
                owner_stack_.top()->child_items().end()) {
                owner_stack_.pop();
                iter_stack_.pop();
            }
        }

        return *this;
    }

    ViewItemIterator<Owner, Item> operator++(int) {
        ViewItemIterator<Owner, Item> pre = *this;
        ++*this;
        return pre;
    }

    bool operator==(const ViewItemIterator &o) const {
        return (iter_stack_.empty() && o.iter_stack_.empty()) || (
            iter_stack_.size() == o.iter_stack_.size() &&
            owner_stack_.top() == o.owner_stack_.top() &&
            iter_stack_.top() == o.iter_stack_.top());
    }

    bool operator!=(const ViewItemIterator &o) const {
        return !((const ViewItemIterator&)*this == o);
    }

    void swap(ViewItemIterator<Owner, Item>& other) {
        swap(owner_stack_, other.owner_stack_);
        swap(iter_stack_, other.iter_stack_);
    }

private:
    std::stack<Owner*> owner_stack_;
    std::stack<child_iterator> iter_stack_;
};

template<class Owner, class Item>
void swap(ViewItemIterator<Owner, Item>& a, ViewItemIterator<Owner, Item>& b)
{
    a.swap(b);
}

} // namespace view
} // namespace pv

#endif // PULSEVIEW_PV_VIEW_VIEWITEMITERATOR_HPP