public override Lexem ReadNextLexem(ParseIterator iterator)
{
System.Diagnostics.Debug.Assert(iterator.CurrentSymbol == SpecialChars.Directive);
iterator.MoveNext();
if (!iterator.MoveToContent())
{
throw CreateExceptionOnCurrentLine("Ожидается директива", iterator);
}
var wps = new WordParserState();
var lex = wps.ReadNextLexem(iterator);
if (lex.Type == LexemType.Identifier && lex.Token == Token.NotAToken)
{
lex.Type = LexemType.Directive;
}
else
{
throw CreateExceptionOnCurrentLine("Ожидается директива", iterator);
}
return(lex);
}
public override Lexem ReadNextLexem(ParseIterator iterator)
{
System.Diagnostics.Debug.Assert(iterator.CurrentSymbol == SpecialChars.Directive);
iterator.MoveNext();
if (!iterator.MoveToContent())
throw CreateExceptionOnCurrentLine("Ожидается директива", iterator);
var wps = new WordParserState();
var lex = wps.ReadNextLexem(iterator);
if (lex.Type == LexemType.Identifier && lex.Token == Token.NotAToken)
{
lex.Type = LexemType.Directive;
}
else
throw CreateExceptionOnCurrentLine("Ожидается директива", iterator);
return lex;
}
public Lexem NextLexem()
{
_state = _emptyState;
while (true)
{
if (_iterator.MoveToContent())
{
char cs = _iterator.CurrentSymbol;
if (Char.IsLetter(cs) || cs == '_')
{
_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 = _operatorState;
}
else if (cs == SpecialChars.EndOperator)
{
_iterator.MoveNext();
return(new Lexem()
{
Type = LexemType.EndOperator, Token = Token.Semicolon
});
}
else if (cs == '?')
{
_iterator.MoveNext();
return(new Lexem()
{
Type = LexemType.Identifier, Token = Token.Question
});
}
else if (cs == SpecialChars.Directive)
{
_state = _directiveState;
}
else
{
var cp = _iterator.GetPositionInfo(_iterator.CurrentLine);
throw new ParserException(cp, string.Format("Неизвестный символ {0}", cs));
}
var lex = _state.ReadNextLexem(_iterator);
if (lex.Type == LexemType.NotALexem)
{
_state = _emptyState;
continue;
}
return(lex);
}
else
{
return(Lexem.EndOfText());
}
}
}