C++ SourceColumnMap::columnToByte方法代码示例

/// \brief When the source code line we want to print is too long for
/// the terminal, select the "interesting" region.
static void selectInterestingSourceRegion(std::string &SourceLine,
                                          std::string &CaretLine,
                                          std::string &FixItInsertionLine,
                                          unsigned Columns,
                                          const SourceColumnMap &map) {
  unsigned MaxColumns = std::max<unsigned>(map.columns(),
                                           std::max(CaretLine.size(),
                                                    FixItInsertionLine.size()));
  // if the number of columns is less than the desired number we're done
  if (MaxColumns <= Columns)
    return;

  // no special characters allowed in CaretLine or FixItInsertionLine
  assert(CaretLine.end() ==
         std::find_if(CaretLine.begin(), CaretLine.end(),
         char_out_of_range(' ','~')));
  assert(FixItInsertionLine.end() ==
         std::find_if(FixItInsertionLine.begin(), FixItInsertionLine.end(),
         char_out_of_range(' ','~')));

  // Find the slice that we need to display the full caret line
  // correctly.
  unsigned CaretStart = 0, CaretEnd = CaretLine.size();
  for (; CaretStart != CaretEnd; ++CaretStart)
    if (!isspace(static_cast<unsigned char>(CaretLine[CaretStart])))
      break;

  for (; CaretEnd != CaretStart; --CaretEnd)
    if (!isspace(static_cast<unsigned char>(CaretLine[CaretEnd - 1])))
      break;

  // caret has already been inserted into CaretLine so the above whitespace
  // check is guaranteed to include the caret

  // If we have a fix-it line, make sure the slice includes all of the
  // fix-it information.
  if (!FixItInsertionLine.empty()) {
    unsigned FixItStart = 0, FixItEnd = FixItInsertionLine.size();
    for (; FixItStart != FixItEnd; ++FixItStart)
      if (!isspace(static_cast<unsigned char>(FixItInsertionLine[FixItStart])))
        break;

    for (; FixItEnd != FixItStart; --FixItEnd)
      if (!isspace(static_cast<unsigned char>(FixItInsertionLine[FixItEnd - 1])))
        break;

    CaretStart = std::min(FixItStart, CaretStart);
    CaretEnd = std::max(FixItEnd, CaretEnd);
  }

  // CaretEnd may have been set at the middle of a character
  // If it's not at a character's first column then advance it past the current
  //   character.
  while (static_cast<int>(CaretEnd) < map.columns() &&
         -1 == map.columnToByte(CaretEnd))
    ++CaretEnd;

  assert((static_cast<int>(CaretStart) > map.columns() ||
          -1!=map.columnToByte(CaretStart)) &&
         "CaretStart must not point to a column in the middle of a source"
         " line character");
  assert((static_cast<int>(CaretEnd) > map.columns() ||
          -1!=map.columnToByte(CaretEnd)) &&
         "CaretEnd must not point to a column in the middle of a source line"
         " character");

  // CaretLine[CaretStart, CaretEnd) contains all of the interesting
  // parts of the caret line. While this slice is smaller than the
  // number of columns we have, try to grow the slice to encompass
  // more context.

  unsigned SourceStart = map.columnToByte(std::min<unsigned>(CaretStart,
                                                             map.columns()));
  unsigned SourceEnd = map.columnToByte(std::min<unsigned>(CaretEnd,
                                                           map.columns()));

  unsigned CaretColumnsOutsideSource = CaretEnd-CaretStart
    - (map.byteToColumn(SourceEnd)-map.byteToColumn(SourceStart));

  char const *front_ellipse = "  ...";
  char const *front_space   = "     ";
  char const *back_ellipse = "...";
  unsigned ellipses_space = strlen(front_ellipse) + strlen(back_ellipse);

  unsigned TargetColumns = Columns;
  // Give us extra room for the ellipses
  //  and any of the caret line that extends past the source
  if (TargetColumns > ellipses_space+CaretColumnsOutsideSource)
    TargetColumns -= ellipses_space+CaretColumnsOutsideSource;

  while (SourceStart>0 || SourceEnd<SourceLine.size()) {
    bool ExpandedRegion = false;

    if (SourceStart>0) {
      unsigned NewStart = map.startOfPreviousColumn(SourceStart);

      // Skip over any whitespace we see here; we're looking for
      // another bit of interesting text.
//.........这里部分代码省略.........