nuttx-apps/graphics/nxwidgets/src/cstringiterator.cxx

/****************************************************************************
 * apps/graphics/nxwidgets/src/cgraphicsport.cxx
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************
 *
 * Portions of this package derive from Woopsi (http://woopsi.org/) and
 * portions are original efforts.  It is difficult to determine at this
 * point what parts are original efforts and which parts derive from Woopsi.
 * However, in any event, the work of  Antony Dzeryn will be acknowledged
 * in most NxWidget files.  Thanks Antony!
 *
 *   Copyright (c) 2007-2011, Antony Dzeryn
 *   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the names "Woopsi", "Simian Zombie" nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Antony Dzeryn ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Antony Dzeryn BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdbool.h>

#include "graphics/nxwidgets/cnxstring.hxx"
#include "graphics/nxwidgets/cstringiterator.hxx"

/****************************************************************************
 * Pre-Processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Method Implementations
 ****************************************************************************/

using namespace NXWidgets;

/**
 * Constructor.  Moves the iterator to the first character in the string.
 *
 * @param string Pointer to the string that will be iterated over.
 */

CStringIterator::CStringIterator(FAR const CNxString* string)
{
  m_pString      = string;
  m_pCurrentChar = m_pString->getCharArray();
  m_currentIndex = 0;
}

/**
 * Moves the iterator to the first character in the string.
 *
 * @param Returns false if the string is empty
 */

bool CStringIterator::moveToFirst()
{
  int length = m_pString->getLength();
  if (length > 0)
    {
      m_pCurrentChar = m_pString->getCharArray();
      m_currentIndex = 0;
      return true;
    }

  return false;
}

/**
 * Moves the iterator to the last character in the string.
 *
 * @param Returns false if the string is empty
 */

bool CStringIterator::moveToLast(void)
{
  int length = m_pString->getLength();
  if (length > 0)
    {
      m_pCurrentChar = m_pString->getCharArray() + length - 1;
      m_currentIndex = length - 1;
      return true;
    }

  return false;
}

/**
 * Move the iterator to the next character in the string.
 *
 * @return True if the iterator moved; false if not (indicates end of string).
 */

bool CStringIterator::moveToNext(void)
{
  if ((unsigned int)m_currentIndex < m_pString->getLength() - 1)
    {
      m_pCurrentChar++;
      m_currentIndex++;
      return true;
    }

  return false;
}

/**
 * Move the iterator to the previous character in the string.
 *
 * @return True if the iterator moved; false if not (indicates start of string).
 */

bool CStringIterator::moveToPrevious(void)
{
  if (m_currentIndex > 0)
    {
      m_pCurrentChar--;
      m_currentIndex--;
      return true;
    }
  return false;
}

/**
 * Move the iterator to the specified index.
 *
 * @param index The index to move to.
 * @return True if the iterator moved; false if not (indicates end of string).
 */

bool CStringIterator::moveTo(int index)
{
  // Abort if index exceeds the size of the string

  if ((unsigned int)index < m_pString->getLength())
    {
      // Move to the requested position

      m_pCurrentChar = m_pString->getCharArray() + index;
      m_currentIndex = index;
      return true;
    }
  return false;
}