Exemplo n.º 1
0
 private static void MoveToBreaker(ConditionContext context)
 {
     while (context.PeekCurrent.HasValue && !breakers.Contains(context.PeekCurrent))
     {
         context.MoveCurrent();
     }
     context.MoveCurrent();
 }
Exemplo n.º 2
0
        public static Condition Parse(string condition)
        {
            var context = new ConditionContext(condition);

            if (string.IsNullOrWhiteSpace(condition))
            {
                return(context.Condition);
            }

            Tokenise(context);

            if (!context.Finished)
            {
                throw new InvalidConditionException(condition);
            }

            return(Stack(context.Values, condition));
        }
Exemplo n.º 3
0
        private static void ProcessWord(ConditionContext context)
        {
            MoveToBreaker(context);

            switch (context.CurrentWord)
            {
            case "or":
                context.Push(new Or());
                context.MoveToCurrent();
                return;

            case "and":
                context.Push(new And());
                context.MoveToCurrent();
                return;

            case "is":
                context.MoveToCurrent();
                if (context.PeekWord(" less than "))
                {
                    context.MoveNext(11);
                    if (context.PeekWord("or equal "))
                    {
                        context.MoveNext(9);
                        context.Push(new LessThanEqual());
                    }
                    else
                    {
                        context.Push(new LessThan());
                    }

                    return;
                }
                else if (context.PeekWord(" greater than "))
                {
                    context.MoveNext(14);
                    if (context.PeekWord("or equal "))
                    {
                        context.MoveNext(9);
                        context.Push(new GreaterThanEqual());
                    }
                    else
                    {
                        context.Push(new GreaterThan());
                    }
                }
                else if (context.PeekWord(" not "))
                {
                    context.MoveNext(5);
                    context.Push(new NotEqual());
                }
                else
                {
                    context.Push(new Equal());
                }
                return;

            default:
                if (context.CurrentWord.Trim().Length > 0)
                {
                    context.Push(CorrectLiteral(context.CurrentWord.Trim()));
                    context.MoveToCurrent();
                }
                break;
            }
        }
Exemplo n.º 4
0
        public static void Tokenise(ConditionContext context)
        {
            while (!context.Finished)
            {
                while (context.NextChar.HasValue && context.NextChar == ' ')
                {
                    context.MoveNext();
                }

                if (!context.NextChar.HasValue)
                {
                    context.MoveNext();
                    break;
                }

                switch (context.NextChar)
                {
                case '(':
                    context.Push(new OpenGroup());
                    context.MoveNext();
                    continue;

                case ')':
                    context.Push(new CloseGroup());
                    context.MoveNext();
                    continue;

                case '=':
                    if (context.Peek.HasValue && context.Peek.Value == '=')
                    {
                        context.Push(new Equal());
                        context.MoveNext(2);
                        continue;
                    }

                    break;

                case '!':
                    if (context.Peek.HasValue && context.Peek.Value == '=')
                    {
                        context.Push(new NotEqual());
                        context.MoveNext(2);
                        continue;
                    }
                    context.Push(new Not());
                    context.MoveNext();
                    continue;

                case '<':
                    if (context.Peek.HasValue && context.Peek.Value == '=')
                    {
                        context.Push(new LessThanEqual());
                        context.MoveNext(2);
                        continue;
                    }
                    context.Push(new LessThan());
                    context.MoveNext();
                    continue;

                case '>':
                    if (context.Peek.HasValue && context.Peek.Value == '=')
                    {
                        context.Push(new GreaterThanEqual());
                        context.MoveNext(2);
                        continue;
                    }
                    context.Push(new GreaterThan());
                    context.MoveNext();
                    continue;

                case '&':
                    if (context.Peek == '&')
                    {
                        context.Push(new And());
                        context.MoveNext(2);
                        continue;
                    }

                    break;

                case '|':
                    if (context.Peek == '|')
                    {
                        context.Push(new Or());
                        context.MoveNext(2);
                        continue;
                    }

                    break;

                default:
                    ProcessWord(context);
                    break;
                }
            }

            if (context.CurrentWord.Length > 0)
            {
                context.Push(CorrectLiteral(context.CurrentWord));
            }
        }