copyscan.cc

/*
 * Copyright (C) 2015, Siemens AG
 * Author: Florian Krügel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "copyscan.hpp"
#include <cctype>
#include <algorithm>
#include "regexConfProvider.hpp"

const string copyrightType("statement");  
hCopyrightScanner::hCopyrightScanner()
{
  RegexConfProvider rcp;
  rcp.maybeLoad("copyright");

  regCopyright = rx::regex(rcp.getRegexValue("copyright","REG_COPYRIGHT"),
                        rx::regex_constants::icase);

  regException = rx::regex(rcp.getRegexValue("copyright","REG_EXCEPTION"),
               rx::regex_constants::icase);
  regNonBlank = rx::regex(rcp.getRegexValue("copyright","REG_NON_BLANK"));

  regSimpleCopyright = rx::regex(rcp.getRegexValue("copyright","REG_SIMPLE_COPYRIGHT"),
                     rx::regex_constants::icase);
}

void hCopyrightScanner::ScanString(const string& s, list<match>& out) const
{

  string::const_iterator begin = s.begin();
  string::const_iterator pos = begin;
  string::const_iterator end = s.end();
  while (pos != end)
  {
    // Find potential copyright statement
    rx::smatch results;
    if (!rx::regex_search(pos, end, results, regCopyright))
      // No further copyright statement found
      break;
    string::const_iterator foundPos = results[0].first;

    if (!rx::regex_match(foundPos, end, regException))
    {
      string::const_iterator j = find(foundPos, end, '\n');
      while (j != end)
      {
        string::const_iterator beginOfLine = j;
        ++beginOfLine;
        string::const_iterator endOfLine = find(beginOfLine, end, '\n');
        if (rx::regex_search(beginOfLine, endOfLine, regSimpleCopyright)
          || !rx::regex_match(beginOfLine, endOfLine, regNonBlank))
        {
          // Found end
          break;
        }
        j = endOfLine;
      }
      if (j - foundPos >= 999)
        // Truncate
        out.push_back(match(foundPos - begin, (foundPos - begin) + 998, copyrightType));
      else
      {
        out.push_back(match(foundPos - begin, j - begin, copyrightType));
      }
      pos = j;
    }
    else
    {
      // An exception: this is not a copyright statement: continue at the end of this statement
      pos = results[0].second;
    }
  }
}