void Scanner::ScanNextToken()

in lib/yamlcpp/src/scanner.cpp [82:174]
59 lines of code
28 McCabe index (conditional complexity)

void Scanner::ScanNextToken() {
  if (m_endedStream) {
    return;
  }

  if (!m_startedStream) {
    return StartStream();
  }

  // get rid of whitespace, etc. (in between tokens it should be irrelevant)
  ScanToNextToken();

  // maybe need to end some blocks
  PopIndentToHere();

  // *****
  // And now branch based on the next few characters!
  // *****

  // end of stream
  if (!INPUT) {
    return EndStream();
  }

  if (INPUT.column() == 0 && INPUT.peek() == Keys::Directive) {
    return ScanDirective();
  }

  // document token
  if (INPUT.column() == 0 && Exp::DocStart().Matches(INPUT)) {
    return ScanDocStart();
  }

  if (INPUT.column() == 0 && Exp::DocEnd().Matches(INPUT)) {
    return ScanDocEnd();
  }

  // flow start/end/entry
  if (INPUT.peek() == Keys::FlowSeqStart ||
      INPUT.peek() == Keys::FlowMapStart) {
    return ScanFlowStart();
  }

  if (INPUT.peek() == Keys::FlowSeqEnd || INPUT.peek() == Keys::FlowMapEnd) {
    return ScanFlowEnd();
  }

  if (INPUT.peek() == Keys::FlowEntry) {
    return ScanFlowEntry();
  }

  // block/map stuff
  if (Exp::BlockEntry().Matches(INPUT)) {
    return ScanBlockEntry();
  }

  if ((InBlockContext() ? Exp::Key() : Exp::KeyInFlow()).Matches(INPUT)) {
    return ScanKey();
  }

  if (GetValueRegex().Matches(INPUT)) {
    return ScanValue();
  }

  // alias/anchor
  if (INPUT.peek() == Keys::Alias || INPUT.peek() == Keys::Anchor) {
    return ScanAnchorOrAlias();
  }

  // tag
  if (INPUT.peek() == Keys::Tag) {
    return ScanTag();
  }

  // special scalars
  if (InBlockContext() && (INPUT.peek() == Keys::LiteralScalar ||
                           INPUT.peek() == Keys::FoldedScalar)) {
    return ScanBlockScalar();
  }

  if (INPUT.peek() == '\'' || INPUT.peek() == '\"') {
    return ScanQuotedScalar();
  }

  // plain scalars
  if ((InBlockContext() ? Exp::PlainScalar() : Exp::PlainScalarInFlow())
          .Matches(INPUT)) {
    return ScanPlainScalar();
  }

  // don't know what it is!
  throw ParserException(INPUT.mark(), ErrorMsg::UNKNOWN_TOKEN);
}