Exemplo n.º 1
0
        public override Lexem ReadNextLexem(ParseIterator iterator)
        {
            bool isEndOfText = false;
            Char cs          = '\0';

            while (true)
            {
                if (!isEndOfText)
                {
                    cs = iterator.CurrentSymbol;
                }
                if (SpecialChars.IsDelimiter(cs) || isEndOfText)
                {
                    var content = iterator.GetContents().content;

                    Lexem lex;

                    if (_booleanOperators.Contains(content))
                    {
                        lex = new Lexem()
                        {
                            Type    = LexemType.Operator,
                            Token   = LanguageDef.GetToken(content),
                            Content = content
                        };
                    }
                    else if (_booleanLiterals.Contains(content))
                    {
                        lex = new Lexem()
                        {
                            Type    = LexemType.BooleanLiteral,
                            Content = content
                        };
                    }
                    else if (_undefined.Contains(content))
                    {
                        lex = new Lexem()
                        {
                            Type    = LexemType.UndefinedLiteral,
                            Content = content
                        };
                    }
                    else if (String.Compare(content, "null", true) == 0)
                    {
                        lex = new Lexem()
                        {
                            Type    = LexemType.NullLiteral,
                            Content = content
                        };
                    }
                    else
                    {
                        lex = new Lexem()
                        {
                            Type    = LexemType.Identifier,
                            Content = content,
                            Token   = LanguageDef.GetToken(content)
                        };

                        if (LanguageDef.IsBuiltInFunction(lex.Token))
                        {
                            iterator.SkipSpaces();
                            if (iterator.CurrentSymbol != '(')
                            {
                                lex.Token = Token.NotAToken;
                            }
                        }
                    }

                    return(lex);
                }

                if (!iterator.MoveNext())
                {
                    if (isEndOfText)
                    {
                        break;
                    }
                    else
                    {
                        isEndOfText = true;
                    }
                }
            }

            return(Lexem.Empty());
        }
Exemplo n.º 2
0
        public override Lexem ReadNextLexem(ParseIterator iterator)
        {
            if (iterator.CurrentSymbol == '<')
            {
                if (iterator.MoveNext())
                {
                    var next = iterator.CurrentSymbol;
                    if (next != '>' && next != '=')
                    {
                        iterator.MoveBack();
                    }
                    else
                    {
                        iterator.MoveNext();
                        return(ExtractOperatorContent(iterator));
                    }
                }
            }
            else if (iterator.CurrentSymbol == '>')
            {
                if (iterator.MoveNext())
                {
                    var next = iterator.CurrentSymbol;
                    if (next != '=')
                    {
                        iterator.MoveBack();
                    }
                    else
                    {
                        iterator.MoveNext();
                        return(ExtractOperatorContent(iterator));
                    }
                }
            }
            else if (iterator.CurrentSymbol == '/')
            {
                if (iterator.MoveNext())
                {
                    if (iterator.CurrentSymbol == '/')
                    {
                        // это комментарий
                        while (iterator.MoveNext())
                        {
                            if (iterator.CurrentSymbol == '\n')
                            {
                                iterator.GetContents();
                                return(Lexem.Empty());
                            }
                        }
                        iterator.GetContents();
                        return(Lexem.EndOfText());
                    }
                    else
                    {
                        iterator.MoveBack();
                    }
                }
            }

            var lex = ExtractOperatorContent(iterator);

            iterator.MoveNext();

            return(lex);
        }
Exemplo n.º 3
0
 public override Lexem ReadNextLexem(ParseIterator iterator)
 {
     return(Lexem.Empty());
 }