Beispiel #1
0
        private QueryExpression ParseExpression()
        {
            QueryExpression     rootExpression   = null;
            CompositeExpression parentExpression = null;

            while (_currentIndex < _expression.Length)
            {
                EatWhitespace();

                if (_expression[_currentIndex] != '@')
                {
                    throw new JsonException("Unexpected character while parsing path query: " + _expression[_currentIndex]);
                }

                _currentIndex++;

                List <PathFilter> expressionPath = new List <PathFilter>();

                if (ParsePath(expressionPath, _currentIndex, true))
                {
                    throw new JsonException("Path ended with open query.");
                }

                EatWhitespace();
                EnsureLength("Path ended with open query.");

                QueryOperator op;
                object        value = null;
                if (_expression[_currentIndex] == ')' ||
                    _expression[_currentIndex] == '|' ||
                    _expression[_currentIndex] == '&')
                {
                    op = QueryOperator.Exists;
                }
                else
                {
                    op = ParseOperator();

                    EatWhitespace();
                    EnsureLength("Path ended with open query.");

                    value = ParseValue();

                    EatWhitespace();
                    EnsureLength("Path ended with open query.");
                }

                BooleanQueryExpression booleanExpression = new BooleanQueryExpression
                {
                    Path     = expressionPath,
                    Operator = op,
                    Value    = (op != QueryOperator.Exists) ? new JValue(value) : null
                };

                if (_expression[_currentIndex] == ')')
                {
                    if (parentExpression != null)
                    {
                        parentExpression.Expressions.Add(booleanExpression);
                        return(rootExpression);
                    }

                    return(booleanExpression);
                }
                if (_expression[_currentIndex] == '&' && Match("&&"))
                {
                    if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
                    {
                        CompositeExpression andExpression = new CompositeExpression {
                            Operator = QueryOperator.And
                        };

                        if (parentExpression != null)
                        {
                            parentExpression.Expressions.Add(andExpression);
                        }

                        parentExpression = andExpression;

                        if (rootExpression == null)
                        {
                            rootExpression = parentExpression;
                        }
                    }

                    parentExpression.Expressions.Add(booleanExpression);
                }
                if (_expression[_currentIndex] == '|' && Match("||"))
                {
                    if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
                    {
                        CompositeExpression orExpression = new CompositeExpression {
                            Operator = QueryOperator.Or
                        };

                        if (parentExpression != null)
                        {
                            parentExpression.Expressions.Add(orExpression);
                        }

                        parentExpression = orExpression;

                        if (rootExpression == null)
                        {
                            rootExpression = parentExpression;
                        }
                    }

                    parentExpression.Expressions.Add(booleanExpression);
                }
            }

            throw new JsonException("Path ended with open query.");
        }
Beispiel #2
0
        private QueryExpression ParseExpression()
        {
            QueryExpression rootExpression = null;
            CompositeExpression parentExpression = null;

            while (_currentIndex < _expression.Length)
            {
                EatWhitespace();

                if (_expression[_currentIndex] != '@')
                    throw new JsonException("Unexpected character while parsing path query: " + _expression[_currentIndex]);

                _currentIndex++;

                List<PathFilter> expressionPath = new List<PathFilter>();

                if (ParsePath(expressionPath, _currentIndex, true))
                    throw new JsonException("Path ended with open query.");

                EatWhitespace();
                EnsureLength("Path ended with open query.");

                QueryOperator op;
                object value = null;
                if (_expression[_currentIndex] == ')'
                    || _expression[_currentIndex] == '|'
                    || _expression[_currentIndex] == '&')
                {
                    op = QueryOperator.Exists;
                }
                else
                {
                    op = ParseOperator();

                    EatWhitespace();
                    EnsureLength("Path ended with open query.");

                    value = ParseValue();

                    EatWhitespace();
                    EnsureLength("Path ended with open query.");
                }

                BooleanQueryExpression booleanExpression = new BooleanQueryExpression
                {
                    Path = expressionPath,
                    Operator = op,
                    Value = (op != QueryOperator.Exists) ? new JValue(value) : null
                };

                if (_expression[_currentIndex] == ')')
                {
                    if (parentExpression != null)
                    {
                        parentExpression.Expressions.Add(booleanExpression);
                        return rootExpression;
                    }
                    
                    return booleanExpression;
                }
                if (_expression[_currentIndex] == '&' && Match("&&"))
                {
                    if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
                    {
                        CompositeExpression andExpression = new CompositeExpression { Operator = QueryOperator.And };

                        if (parentExpression != null)
                            parentExpression.Expressions.Add(andExpression);

                        parentExpression = andExpression;

                        if (rootExpression == null)
                            rootExpression = parentExpression;
                    }

                    parentExpression.Expressions.Add(booleanExpression);
                }
                if (_expression[_currentIndex] == '|' && Match("||"))
                {
                    if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
                    {
                        CompositeExpression orExpression = new CompositeExpression { Operator = QueryOperator.Or };

                        if (parentExpression != null)
                            parentExpression.Expressions.Add(orExpression);

                        parentExpression = orExpression;

                        if (rootExpression == null)
                            rootExpression = parentExpression;
                    }

                    parentExpression.Expressions.Add(booleanExpression);
                }
            }

            throw new JsonException("Path ended with open query.");
        }