cycle.h

/*
  This file is part of the Cutelee template system.
 
  Copyright (c) 2009,2010 Stephen Kelly <steveire@gmail.com>
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either version
  2.1 of the Licence, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
*/
 
#ifndef CYCLENODE_H
#define CYCLENODE_H
 
#include "node.h"
 
using namespace Cutelee;
 
class CycleNodeFactory : public AbstractNodeFactory
{
  Q_OBJECT
public:
  CycleNodeFactory();
 
  Node *getNode(const QString &tagContent, Parser *p) const override;
};

template <typename T> class RingIterator
{
public:
  RingIterator<T>() {}
 
  RingIterator<T>(const QList<T> &list)
      : m_begin(list.constBegin()), m_it(list.constBegin()),
        m_end(list.constEnd())
  {
    Q_ASSERT(!list.isEmpty());
  }

  T next()
  {
    Q_ASSERT(m_it != m_end);
 
    const T t = *m_it++;
    if (m_it == m_end)
      m_it = m_begin;
    return t;
  }
 
private:
  typename QList<T>::const_iterator m_begin;
  typename QList<T>::const_iterator m_it;
  typename QList<T>::const_iterator m_end;
};
 
typedef RingIterator<FilterExpression> FilterExpressionRotator;
 
Q_DECLARE_METATYPE(FilterExpressionRotator)
 
class CycleNode : public Node
{
  Q_OBJECT
public:
  CycleNode(const QList<FilterExpression> &list, const QString &name,
            QObject *parent = {});
 
  void render(OutputStream *stream, Context *c) const override;
 
private:
  const QList<FilterExpression> m_list;
  FilterExpressionRotator m_variableIterator;
  const QString m_name;
};
 
#endif