C++ FileOffset::getFID方法代码示例

static void applyRewrite(EditsReceiver &receiver,
                         StringRef text, FileOffset offs, unsigned len,
                         const SourceManager &SM, const LangOptions &LangOpts) {
  assert(!offs.getFID().isInvalid());
  SourceLocation Loc = SM.getLocForStartOfFile(offs.getFID());
  Loc = Loc.getLocWithOffset(offs.getOffset());
  assert(Loc.isFileID());

  if (text.empty())
    adjustRemoval(SM, LangOpts, Loc, offs, len, text);

  CharSourceRange range = CharSourceRange::getCharRange(Loc,
                                                     Loc.getLocWithOffset(len));

  if (text.empty()) {
    assert(len);
    receiver.remove(range);
    return;
  }

  if (len)
    receiver.replace(range, text);
  else
    receiver.insert(Loc, text);
}

StringRef EditedSource::getSourceText(FileOffset BeginOffs, FileOffset EndOffs,
                                      bool &Invalid) {
  assert(BeginOffs.getFID() == EndOffs.getFID());
  assert(BeginOffs <= EndOffs);
  SourceLocation BLoc = SourceMgr.getLocForStartOfFile(BeginOffs.getFID());
  BLoc = BLoc.getLocWithOffset(BeginOffs.getOffset());
  assert(BLoc.isFileID());
  SourceLocation
    ELoc = BLoc.getLocWithOffset(EndOffs.getOffset() - BeginOffs.getOffset());
  return Lexer::getSourceText(CharSourceRange::getCharRange(BLoc, ELoc),
                              SourceMgr, LangOpts, &Invalid);
}

bool Commit::canInsertInOffset(SourceLocation OrigLoc, FileOffset Offs) {
  for (const auto &act : CachedEdits)
    if (act.Kind == Act_Remove) {
      if (act.Offset.getFID() == Offs.getFID() &&
          Offs > act.Offset && Offs < act.Offset.getWithOffset(act.Length))
        return false; // position has been removed.
    }

  if (!Editor)
    return true;
  return Editor->canInsertInOffset(OrigLoc, Offs);
}

/// \brief Check the range that we are going to remove and:
/// -Remove any trailing whitespace if possible.
/// -Insert a space if removing the range is going to mess up the source tokens.
static void adjustRemoval(const SourceManager &SM, const LangOptions &LangOpts,
                          SourceLocation Loc, FileOffset offs,
                          unsigned &len, StringRef &text) {
  assert(len && text.empty());
  SourceLocation BeginTokLoc = Lexer::GetBeginningOfToken(Loc, SM, LangOpts);
  if (BeginTokLoc != Loc)
    return; // the range is not at the beginning of a token, keep the range.

  bool Invalid = false;
  StringRef buffer = SM.getBufferData(offs.getFID(), &Invalid);
  if (Invalid)
    return;

  unsigned begin = offs.getOffset();
  unsigned end = begin + len;

  // Do not try to extend the removal if we're at the end of the buffer already.
  if (end == buffer.size())
    return;

  assert(begin < buffer.size() && end < buffer.size() && "Invalid range!");

  // FIXME: Remove newline.

  if (begin == 0) {
    if (buffer[end] == ' ')
      ++len;
    return;
  }

  if (buffer[end] == ' ') {
    assert((end + 1 != buffer.size() || buffer.data()[end + 1] == 0) &&
           "buffer not zero-terminated!");
    if (canRemoveWhitespace(/*left=*/buffer[begin-1],
                            /*beforeWSpace=*/buffer[end-1],
                            /*right=*/buffer.data()[end + 1], // zero-terminated
                            LangOpts))
      ++len;
    return;
  }

  if (!canBeJoined(buffer[begin-1], buffer[end], LangOpts))
    text = " ";
}

/// \brief Check the range that we are going to remove and:
/// -Remove any trailing whitespace if possible.
/// -Insert a space if removing the range is going to mess up the source tokens.
static void adjustRemoval(const SourceManager &SM, const LangOptions &LangOpts,
                          SourceLocation Loc, FileOffset offs,
                          unsigned &len, StringRef &text) {
  assert(len && text.empty());
  SourceLocation BeginTokLoc = Lexer::GetBeginningOfToken(Loc, SM, LangOpts);
  if (BeginTokLoc != Loc)
    return; // the range is not at the beginning of a token, keep the range.

  bool Invalid = false;
  StringRef buffer = SM.getBufferData(offs.getFID(), &Invalid);
  if (Invalid)
    return;

  unsigned begin = offs.getOffset();
  unsigned end = begin + len;

  // FIXME: Remove newline.

  if (begin == 0) {
    if (buffer[end] == ' ')
      ++len;
    return;
  }

  if (buffer[end] == ' ') {
    if (canRemoveWhitespace(/*left=*/buffer[begin-1],
                            /*beforeWSpace=*/buffer[end-1],
                            /*right=*/buffer[end+1],
                            LangOpts))
      ++len;
    return;
  }

  if (!canBeJoined(buffer[begin-1], buffer[end], LangOpts))
    text = " ";
}