Exemplo n.º 1
0
void Scanner::ScanNextToken() {
  if (m_endedStream) {
    return;
  }

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

  // get rid of whitespace, etc. (in between tokens it should be irrelevent)
  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);
}
Exemplo n.º 2
0
	// ScanNextToken
	// . The main scanning function; here we branch out and
	//   scan whatever the next token should be.
	void Scanner::ScanNextToken()
	{
		if(m_endedStream)
			return;

		if(!m_startedStream)
			return StartStream();

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

		// check the latest simple key
		VerifySimpleKey();

		// maybe need to end some blocks
		PopIndentTo(INPUT.column);

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

		// end of stream
		if(INPUT.peek() == EOF)
			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((m_flowLevel == 0 ? Exp::Key : Exp::KeyInFlow).Matches(INPUT))
			return ScanKey();

		if((m_flowLevel == 0 ? Exp::Value : Exp::ValueInFlow).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(m_flowLevel == 0 && (INPUT.peek() == Keys::LiteralScalar || INPUT.peek() == Keys::FoldedScalar))
			return ScanBlockScalar();

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

		// plain scalars
		if((m_flowLevel == 0 ? Exp::PlainScalar : Exp::PlainScalarInFlow).Matches(INPUT))
			return ScanPlainScalar();

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