/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * 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 name of the Willow Garage, Inc. 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
 *
 * author: Dave Hershberger
 */

#include <cstdio>  // for EOF
#include <string>
#include <sstream>
#include <vector>

namespace costmap_2d
{

/** @brief Parse a vector of vector of floats from a string.
 * @param input
 * @param error_return
 * Syntax is [[1.0, 2.0], [3.3, 4.4, 5.5], ...] */
std::vector<std::vector<float> > parseVVF(const std::string& input, std::string& error_return)
{
  std::vector<std::vector<float> > result;

  std::stringstream input_ss(input);
  int depth = 0;
  std::vector<float> current_vector;
  while (!!input_ss && !input_ss.eof())
  {
    switch (input_ss.peek())
    {
    case EOF:
      break;
    case '[':
      depth++;
      if (depth > 2)
      {
        error_return = "Array depth greater than 2";
        return result;
      }
      input_ss.get();
      current_vector.clear();
      break;
    case ']':
      depth--;
      if (depth < 0)
      {
        error_return = "More close ] than open [";
        return result;
      }
      input_ss.get();
      if (depth == 1)
      {
        result.push_back(current_vector);
      }
      break;
    case ',':
    case ' ':
    case '\t':
      input_ss.get();
      break;
    default:  // All other characters should be part of the numbers.
      if (depth != 2)
      {
        std::stringstream err_ss;
        err_ss << "Numbers at depth other than 2. Char was '" << char(input_ss.peek()) << "'.";
        error_return = err_ss.str();
        return result;
      }
      float value;
      input_ss >> value;
      if (!!input_ss)
      {
        current_vector.push_back(value);
      }
      break;
    }
  }

  if (depth != 0)
  {
    error_return = "Unterminated vector string.";
  }
  else
  {
    error_return = "";
  }

  return result;
}

}  // end namespace costmap_2d