Function ugrep

examples/ugrep.cpp:545–777

Search file, display pattern matches, return true when pattern matched anywhere

// Search file, display pattern matches, return true when pattern matched anywhere
bool ugrep(reflex::Pattern& pattern, FILE *file, reflex::Input::file_encoding_type encoding, const char *infile)
{
  bool found = false;

  std::string label, mark, unmark;

  if (flag_filename && infile)
    label.assign(infile).append(":");

  if (grep_color)
  {
    mark.assign("\033[").append(grep_color).append("m");
    unmark.assign("\033[0m");
  }

  // create an input object to read the file (or stdin) using the given file format encoding
  reflex::Input input(file, encoding);

  if (flag_quiet)
  {
    // -q quiet mode: report if a single pattern match was found in the input

    found = reflex::Matcher(pattern, input).find();

    if (flag_invert_match)
      found = !found;
  }
  else if (flag_count)
  {
    // -c count mode: count the number of lines/patterns matched

    if (flag_invert_match)
    {
      size_t lines = 0;
      std::string line;

      // -c count mode w/ -v: count the number of non-matching lines
      while (input)
      {
        int ch;

        // read the next line
        line.clear();
        while ((ch = input.get()) != EOF && ch != '\n')
          line.push_back(ch);
        if (ch == EOF && line.empty())
          break;

        // count this line if not matched
        if (!reflex::Matcher(pattern, line).find())
        {
          found = true;
          ++lines;
        }
      }

      std::cout << label << lines << std::endl;
    }