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);
}
public virtual Lexem NextLexem()
{
_state = _emptyState;
while (true)
{
if (_iterator.MoveToContent())
{
SelectState();
Lexem lex;
try
{
lex = _state.ReadNextLexem(_iterator);
if (lex.Type == LexemType.NotALexem) // обработанные синтакс-ошибки
{
_state = _emptyState;
continue;
}
}
catch (SyntaxErrorException exc)
{
if (HandleError(exc))
{
lex = Lexem.Empty();
}
else
{
throw;
}
}
return(lex);
}
else
{
return(Lexem.EndOfText());
}
}
}
public override Lexem ReadNextLexem(SourceCodeIterator iterator)
{
System.Diagnostics.Debug.Assert(iterator.CurrentSymbol == SpecialChars.Preprocessor);
iterator.MoveNext();
if (!iterator.MoveToContent())
{
throw CreateExceptionOnCurrentLine("Ожидается директива", iterator);
}
if (!Char.IsLetter(iterator.CurrentSymbol))
{
CreateExceptionOnCurrentLine("Ожидается директива препроцессора", iterator);
}
var lex = _wordExtractor.ReadNextLexem(iterator);
lex.Type = LexemType.PreprocessorDirective;
return(lex);
}
