public override Lexem ReadNextLexem(SourceCodeIterator iterator)
{
bool hasDecimalPoint = false;
while (true)
{
if (Char.IsDigit(iterator.CurrentSymbol))
{
if (!iterator.MoveNext())
{
var lex = new Lexem()
{
Type = LexemType.NumberLiteral,
Content = iterator.GetContents()
};
return(lex);
}
}
else if (SpecialChars.IsDelimiter(iterator.CurrentSymbol))
{
if (iterator.CurrentSymbol == '.')
{
if (!hasDecimalPoint)
{
hasDecimalPoint = true;
iterator.MoveNext();
continue;
}
else
{
throw CreateExceptionOnCurrentLine("Некорректно указана десятичная точка в числе", iterator);
}
}
var lex = new Lexem()
{
Type = LexemType.NumberLiteral,
Content = iterator.GetContents()
};
return(lex);
}
else
{
throw CreateExceptionOnCurrentLine("Некорректный символ", iterator);
}
}
}
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)
{
var numbers = new StringBuilder();
while (iterator.MoveNext())
{
var cs = iterator.CurrentSymbol;
if (cs == SpecialChars.DateQuote)
{
iterator.GetContents(1, 1);
iterator.MoveNext();
try
{
var lex = new Lexem()
{
Type = LexemType.DateLiteral,
Content = FullDateTimeString(numbers)
};
return(lex);
}
catch (FormatException)
{
throw CreateExceptionOnCurrentLine("Некорректный литерал даты", iterator);
}
}
if (Char.IsDigit(cs))
{
numbers.Append(cs);
}
if (numbers.Length > 14)
{
throw CreateExceptionOnCurrentLine("Некорректный литерал даты", iterator);
}
}
throw CreateExceptionOnCurrentLine("Незавершенный литерал даты", iterator);
}
