rangeIterator.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file rangeIterator.cxx
 * @author drose
 * @date 2003-09-07
 */

#include "rangeIterator.h"

/**
 * Constructs an iterator to walk through the codes on the descriptor.  It is
 * important not to modify the RangeDescription object during the lifetime of
 * the iterator.
 */
RangeIterator::
RangeIterator(const RangeDescription &desc) :
  _desc(desc)
{
  _it = _desc._range_list.begin();
  if (_it == _desc._range_list.end()) {
    _code = -1;
  } else {
    _code = (*_it)._from_code;
    _codes_generated.insert(_code);
  }
}

/**
 * Advances the iterator to the next code.  Returns true if there is a next
 * code, or false if there are no mode codes.
 */
bool RangeIterator::
next() {
  do {
    if (_it == _desc._range_list.end()) {
      return false;
    }

    if (_code < (*_it)._to_code) {
      _code++;

    } else {
      _it++;
      if (_it == _desc._range_list.end()) {
        _code = -1;
        return false;
      }

      _code = (*_it)._from_code;
    }

    // If this code has already been generated, repeat and skip to the next
    // one.
  } while (!_codes_generated.insert(_code).second);

  return true;
}