private LexerState SelectState()
{
char cs = _iterator.CurrentSymbol;
if (Char.IsLetter(cs) || cs == SpecialChars.Underscore)
{
_state = _wordState;
}
else if (Char.IsDigit(cs))
{
_state = _numberState;
}
else if (cs == SpecialChars.DateQuote)
{
_state = _dateState;
}
else if (cs == SpecialChars.StringQuote)
{
_state = _stringState;
}
else if (SpecialChars.IsOperatorChar(cs))
{
_state = CommentOrOperatorState(cs);
}
else if (cs == SpecialChars.EndOperator)
{
SetFixedState(LexemType.EndOperator, Token.Semicolon);
}
else if (cs == SpecialChars.QuestionMark)
{
SetFixedState(LexemType.Operator, Token.Question);
}
else if (cs == SpecialChars.Preprocessor)
{
_state = _directiveState;
}
else if (cs == SpecialChars.Annotation)
{
_iterator.GetContents();
_iterator.MoveNext();
_state = _annotationState;
}
else
{
var cp = _iterator.GetPositionInfo();
var exc = new SyntaxErrorException(cp, string.Format("Неизвестный символ {0}", cs));
if (!HandleError(exc))
{
throw exc;
}
}
return(_state);
}
public override Lexem ReadNextLexem(SourceCodeIterator iterator)
{
System.Diagnostics.Debug.Assert(iterator.CurrentSymbol == SpecialChars.Preprocessor);
if (!iterator.OnNewLine)
{
throw CreateExceptionOnCurrentLine("Недопустимое начало директивы препроцессора", iterator);
}
iterator.MoveNext();
var position = iterator.GetPositionInfo();
if (!iterator.MoveToContent())
{
throw CreateExceptionOnCurrentLine(MESSAGE_DIRECTIVE_EXPECTED, iterator);
}
if (position.LineNumber != iterator.CurrentLine)
{
throw new SyntaxErrorException(position, MESSAGE_DIRECTIVE_EXPECTED);
}
if (!Char.IsLetter(iterator.CurrentSymbol))
{
throw CreateExceptionOnCurrentLine(MESSAGE_DIRECTIVE_EXPECTED, iterator);
}
var lex = _wordExtractor.ReadNextLexem(iterator);
lex.Type = LexemType.PreprocessorDirective;
return(lex);
}
