copyscan.cc

/*
 SPDX-FileCopyrightText: © 2015,2022, Siemens AG
 Author: Florian Krügel
 
 SPDX-License-Identifier: GPL-2.0-only
*/
 
#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);
  regSpdxCopyright = rx::regex(rcp.getRegexValue("copyright","REG_SPDX_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, regSpdxCopyright)){
          // Found end
          break;
        }
        if (rx::regex_search(beginOfLine, endOfLine, regSimpleCopyright)
          || !rx::regex_match(beginOfLine, endOfLine, regNonBlank))
        {
          // Found end
          break;
        }
        j = endOfLine;
      }
      if (j - foundPos >= 301)
        // Truncate
        out.push_back(match(foundPos - begin, (foundPos - begin) + 300, 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;
    }
  }
}