/// <summary>
        /// Parse the compute option in the expand option text.
        /// </summary>
        /// <returns>The compute option for expand</returns>
        private ComputeToken ParseInnerCompute()
        {
            this.lexer.NextToken();
            string computeText = this.ReadQueryOption();

            UriQueryExpressionParser computeParser = new UriQueryExpressionParser(this.MaxOrderByDepth, enableCaseInsensitiveBuiltinIdentifier);

            return(computeParser.ParseCompute(computeText));
        }
Ejemplo n.º 2
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        /// <summary>
        /// Parse the apply option in the expand option text.
        /// </summary>
        /// <returns>The apply option for expand</returns>
        private IEnumerable <QueryToken> ParseInnerApply()
        {
            this.lexer.NextToken();
            string applyText = this.ReadQueryOption();

            UriQueryExpressionParser applyParser = new UriQueryExpressionParser(this.MaxOrderByDepth, enableCaseInsensitiveBuiltinIdentifier);

            return(applyParser.ParseApply(applyText));
        }
Ejemplo n.º 3
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        /// <summary>
        /// Parse the orderby option in the select/expand option text.
        /// </summary>
        /// <returns>The orderby option for select/expand</returns>
        private IEnumerable <OrderByToken> ParseInnerOrderBy()
        {
            // advance to the equal sign
            this.lexer.NextToken();
            string orderByText = this.ReadQueryOption();

            UriQueryExpressionParser orderbyParser = new UriQueryExpressionParser(this.MaxOrderByDepth, enableCaseInsensitiveBuiltinIdentifier);

            return(orderbyParser.ParseOrderBy(orderByText));
        }
Ejemplo n.º 4
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        /// <summary>
        /// Parse the filter option in the select/expand option text.
        /// </summary>
        /// <returns>The filter option for select/expand</returns>
        private QueryToken ParseInnerFilter()
        {
            // advance to the equal sign
            this.lexer.NextToken();
            string filterText = this.ReadQueryOption();

            UriQueryExpressionParser filterParser = new UriQueryExpressionParser(this.MaxFilterDepth, enableCaseInsensitiveBuiltinIdentifier);

            return(filterParser.ParseFilter(filterText));
        }
Ejemplo n.º 5
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        /// <summary>
        /// Parse the filter option in the $count segment.
        /// </summary>
        /// <returns>The filter option for the $count segment.</returns>
        private QueryToken ParseInnerFilter()
        {
            // advance to the equal sign
            this.lexer.NextToken();
            string filterText = UriParserHelper.ReadQueryOption(this.lexer);

            UriQueryExpressionParser filterParser = new UriQueryExpressionParser(ODataUriParserSettings.DefaultFilterLimit, this.UriQueryExpressionParser.EnableCaseInsensitiveBuiltinIdentifier);

            return(filterParser.ParseFilter(filterText));
        }
        /// <summary>
        /// Tries to parse a collection of function parameters. Allows path and filter to share the core algorithm while representing parameters differently.
        /// </summary>
        /// <param name="parser">The UriQueryExpressionParser to read from.</param>
        /// <param name="endTokenKind">The token kind that marks the end of the parameters.</param>
        /// <param name="splitParameters">The parameters if they were successfully split.</param>
        /// <returns>Whether the parameters could be split.</returns>
        private static bool TrySplitOperationParameters(this UriQueryExpressionParser parser, ExpressionTokenKind endTokenKind, out ICollection <FunctionParameterToken> splitParameters)
        {
            Debug.Assert(parser != null, "parser != null");
            var lexer      = parser.Lexer;
            var parameters = new List <FunctionParameterToken>();

            splitParameters = parameters;

            ExpressionToken currentToken = lexer.CurrentToken;

            if (currentToken.Kind == endTokenKind)
            {
                return(true);
            }

            if (currentToken.Kind != ExpressionTokenKind.Identifier || lexer.PeekNextToken().Kind != ExpressionTokenKind.Equal)
            {
                return(false);
            }

            while (currentToken.Kind != endTokenKind)
            {
                lexer.ValidateToken(ExpressionTokenKind.Identifier);
                string identifier = lexer.CurrentToken.GetIdentifier();
                lexer.NextToken();

                lexer.ValidateToken(ExpressionTokenKind.Equal);
                lexer.NextToken();

                // the below UriQueryExpressionParser.ParseExpression() is able to parse common expression per ABNF:
                //      functionExprParameter  = parameterName EQ ( parameterAlias / parameterValue )
                //      parameterValue = arrayOrObject
                //                       / commonExpr
                QueryToken parameterValue = parser.ParseExpression();
                parameters.Add(new FunctionParameterToken(identifier, parameterValue));

                // the above parser.ParseExpression() already moves to the next token, now get CurrentToken checking a comma followed by something
                currentToken = lexer.CurrentToken;
                if (currentToken.Kind == ExpressionTokenKind.Comma)
                {
                    lexer.NextToken();
                    currentToken = lexer.CurrentToken;
                    if (currentToken.Kind == endTokenKind)
                    {
                        // Trailing comma.
                        throw new ODataException(ODataErrorStrings.ExpressionLexer_SyntaxError(lexer.Position, lexer.ExpressionText));
                    }
                }
            }

            return(true);
        }
        /// <summary>
        /// Tries to parse a collection of function parameters for path.
        /// </summary>
        /// <param name="parenthesisExpression">The contents of the parentheses portion of the current path segment.</param>
        /// <param name="configuration">The ODataUriParserConfiguration to create a UriQueryExpressionParser.</param>
        /// <param name="splitParameters">The parameters if they were successfully split.</param>
        /// <returns>Whether the parameters could be split.</returns>
        internal static bool TrySplitOperationParameters(string parenthesisExpression, ODataUriParserConfiguration configuration, out ICollection <FunctionParameterToken> splitParameters)
        {
            ExpressionLexer          lexer  = new ExpressionLexer(parenthesisExpression, true /*moveToFirstToken*/, false /*useSemicolonDelimeter*/, true /*parsingFunctionParameters*/);
            UriQueryExpressionParser parser = new UriQueryExpressionParser(configuration.Settings.FilterLimit, lexer);
            var ret = parser.TrySplitOperationParameters(ExpressionTokenKind.End, out splitParameters);

            // check duplicate names
            if (splitParameters.Select(t => t.ParameterName).Distinct().Count() != splitParameters.Count)
            {
                throw new ODataException(ODataErrorStrings.FunctionCallParser_DuplicateParameterOrEntityKeyName);
            }

            return(ret);
        }
Ejemplo n.º 8
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        /// <summary>
        /// Parses the <paramref name="compute"/> clause, binding
        /// the text into a metadata-bound list of compuations using the provided model.
        /// </summary>
        /// <param name="compute">String representation of the compute expression from the URI.</param>
        /// <param name="configuration">The configuration used for binding.</param>
        /// <param name="odataPathInfo">The path info from Uri path.</param>
        /// <returns>A <see cref="ComputeClause"/> representing the metadata bound compute expression.</returns>
        private ComputeClause ParseComputeImplementation(string compute, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
        {
            ExceptionUtils.CheckArgumentNotNull(configuration, "configuration");
            ExceptionUtils.CheckArgumentNotNull(compute, "compute");

            // Get the syntactic representation of the apply expression
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(configuration.Settings.FilterLimit, configuration.EnableCaseInsensitiveUriFunctionIdentifier);
            ComputeToken             computeToken     = expressionParser.ParseCompute(compute);

            // Bind it to metadata
            BindingState   state         = CreateBindingState(configuration, odataPathInfo);
            MetadataBinder binder        = new MetadataBinder(state);
            ComputeBinder  computeBinder = new ComputeBinder(binder.Bind);
            ComputeClause  boundNode     = computeBinder.BindCompute(computeToken);

            return(boundNode);
        }
Ejemplo n.º 9
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        /// <summary>
        /// Parses an <paramref name="orderBy "/> clause, binding
        /// the text into semantic nodes using the provided model.
        /// </summary>
        /// <param name="orderBy">String representation of the orderby expression.</param>
        /// <param name="configuration">The configuration used for binding.</param>
        /// <param name="odataPathInfo">The path info from Uri path.</param>
        /// <returns>An <see cref="OrderByClause"/> representing the metadata bound orderby expression.</returns>
        private OrderByClause ParseOrderByImplementation(string orderBy, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
        {
            ExceptionUtils.CheckArgumentNotNull(configuration, "configuration");
            ExceptionUtils.CheckArgumentNotNull(configuration.Model, "model");
            ExceptionUtils.CheckArgumentNotNull(orderBy, "orderBy");

            // Get the syntactic representation of the orderby expression
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(configuration.Settings.OrderByLimit, configuration.EnableCaseInsensitiveUriFunctionIdentifier);
            var orderByQueryTokens = expressionParser.ParseOrderBy(orderBy);

            // Bind it to metadata
            BindingState state = CreateBindingState(configuration, odataPathInfo);

            MetadataBinder binder        = new MetadataBinder(state);
            OrderByBinder  orderByBinder = new OrderByBinder(binder.Bind);
            OrderByClause  orderByClause = orderByBinder.BindOrderBy(state, orderByQueryTokens);

            return(orderByClause);
        }
Ejemplo n.º 10
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        /// <summary>
        /// Parses a <paramref name="filter"/> clause, binding
        /// the text into semantic nodes using the provided model.
        /// </summary>
        /// <param name="filter">String representation of the filter expression.</param>
        /// <param name="configuration">The configuration used for binding.</param>
        /// <param name="odataPathInfo">The path info from Uri path.</param>
        /// <returns>A <see cref="FilterClause"/> representing the metadata bound filter expression.</returns>
        private FilterClause ParseFilterImplementation(string filter, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
        {
            ExceptionUtils.CheckArgumentNotNull(configuration, "configuration");
            ExceptionUtils.CheckArgumentNotNull(odataPathInfo, "odataPathInfo");
            ExceptionUtils.CheckArgumentNotNull(filter, "filter");

            // Get the syntactic representation of the filter expression
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(configuration.Settings.FilterLimit, configuration.EnableCaseInsensitiveUriFunctionIdentifier);
            QueryToken filterToken = expressionParser.ParseFilter(filter);

            // Bind it to metadata
            BindingState state = CreateBindingState(configuration, odataPathInfo);

            MetadataBinder binder       = new MetadataBinder(state);
            FilterBinder   filterBinder = new FilterBinder(binder.Bind, state);
            FilterClause   boundNode    = filterBinder.BindFilter(filterToken);

            return(boundNode);
        }
Ejemplo n.º 11
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        /// <summary>
        /// Parses the <paramref name="compute"/> clause, binding
        /// the text into a metadata-bound list of compuations using the provided model.
        /// </summary>
        /// <param name="compute">String representation of the compute expression from the URI.</param>
        /// <param name="configuration">The configuration used for binding.</param>
        /// <param name="odataPathInfo">The path info from Uri path.</param>
        /// <returns>A <see cref="ComputeClause"/> representing the metadata bound compute expression.</returns>
        private static ComputeClause ParseComputeImplementation(string compute, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
        {
            ExceptionUtils.CheckArgumentNotNull(configuration, "configuration");
            ExceptionUtils.CheckArgumentNotNull(compute, "compute");

            // Get the syntactic representation of the apply expression
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(configuration.Settings.FilterLimit, configuration.EnableCaseInsensitiveUriFunctionIdentifier);
            ComputeToken             computeToken     = expressionParser.ParseCompute(compute);

            // Bind it to metadata
            BindingState state = new BindingState(configuration);

            state.ImplicitRangeVariable = NodeFactory.CreateImplicitRangeVariable(odataPathInfo.TargetEdmType.ToTypeReference(), odataPathInfo.TargetNavigationSource);
            state.RangeVariables.Push(state.ImplicitRangeVariable);
            MetadataBinder binder        = new MetadataBinder(state);
            ComputeBinder  computeBinder = new ComputeBinder(binder.Bind);
            ComputeClause  boundNode     = computeBinder.BindCompute(computeToken);

            return(boundNode);
        }
Ejemplo n.º 12
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        /// <summary>
        /// Parses an <paramref name="apply"/> clause, binding
        /// the text into a metadata-bound or dynamic properties to be applied using the provided model.
        /// </summary>
        /// <param name="apply">String representation of the apply expression.</param>
        /// <param name="configuration">The configuration used for binding.</param>
        /// <param name="odataPathInfo">The path info from Uri path.</param>
        /// <returns>A <see cref="ApplyClause"/> representing the metadata bound apply expression.</returns>
        private static ApplyClause ParseApplyImplementation(string apply, ODataUriParserConfiguration configuration, ODataPathInfo odataPathInfo)
        {
            ExceptionUtils.CheckArgumentNotNull(configuration, "configuration");
            ExceptionUtils.CheckArgumentNotNull(apply, "apply");

            // Get the syntactic representation of the apply expression
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(configuration.Settings.FilterLimit, configuration.EnableCaseInsensitiveUriFunctionIdentifier);
            var applyTokens = expressionParser.ParseApply(apply);

            // Bind it to metadata
            BindingState state = new BindingState(configuration, odataPathInfo.Segments.ToList());

            state.ImplicitRangeVariable = NodeFactory.CreateImplicitRangeVariable(odataPathInfo.TargetEdmType.ToTypeReference(), odataPathInfo.TargetNavigationSource);
            state.RangeVariables.Push(state.ImplicitRangeVariable);
            MetadataBinder binder      = new MetadataBinder(state);
            ApplyBinder    applyBinder = new ApplyBinder(binder.Bind, state, configuration, odataPathInfo);
            ApplyClause    boundNode   = applyBinder.BindApply(applyTokens);

            return(boundNode);
        }
Ejemplo n.º 13
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        /// <summary>
        /// Parse expression into syntaxs token tree, and bind it into semantics node tree.
        /// </summary>
        /// <param name="bindingState">The BindingState.</param>
        /// <param name="aliasValueExpression">The alias value's expression text.</param>
        /// <param name="parameterType">The edm type of the parameter.</param>
        /// <returns>The semantics node of the expression text.</returns>
        private SingleValueNode ParseAndBindParameterAliasValueExpression(BindingState bindingState, string aliasValueExpression, IEdmTypeReference parameterType)
        {
            // Get the syntactic representation of the filter expression
            // TODO: change Settings.FilterLimit to ParameterAliasValueLimit
            UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(bindingState.Configuration.Settings.FilterLimit);
            QueryToken aliasValueToken = expressionParser.ParseExpressionText(aliasValueExpression);

            // Special logic to handle parameter alias token.
            aliasValueToken = ParseComplexOrCollectionAlias(aliasValueToken, parameterType, bindingState.Model);

            // Get the semantic node, and check for SingleValueNode
            QueryNode       aliasValueNode = this.bindMethod(aliasValueToken);
            SingleValueNode result         = aliasValueNode as SingleValueNode;

            if (result == null)
            {
                // TODO: add string resource
                throw new ODataException(Strings.MetadataBinder_ParameterAliasValueExpressionNotSingleValue);
            }

            return(result);
        }
Ejemplo n.º 14
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        /// <summary>Attempts to parse key values from the specified text.</summary>
        /// <param name='text'>Text to parse (not null).</param>
        /// <param name='instance'>After invocation, the parsed key instance.</param>
        /// <param name="enableUriTemplateParsing">Whether Uri template parsing is enabled.</param>
        /// <returns>
        /// true if the key instance was parsed; false if there was a
        /// syntactic error.
        /// </returns>
        /// <remarks>
        /// The returned instance contains only string values. To get typed values, a call to
        /// TryConvertValues is necessary.
        /// </remarks>
        private static bool TryParseFromUri(string text, out SegmentArgumentParser instance, bool enableUriTemplateParsing)
        {
            Debug.Assert(text != null, "text != null");

            Dictionary <string, string> namedValues = null;
            List <string> positionalValues          = null;

            // parse keys just like function parameters
            ExpressionLexer          lexer      = new ExpressionLexer(string.Concat("(", text, ")"), true, false);
            UriQueryExpressionParser exprParser = new UriQueryExpressionParser(ODataUriParserSettings.DefaultFilterLimit /* default limit for parsing key value */, lexer);
            var tmp = (new FunctionCallParser(lexer, exprParser)).ParseArgumentListOrEntityKeyList();

            if (lexer.CurrentToken.Kind != ExpressionTokenKind.End)
            {
                instance = null;
                return(false);
            }

            if (tmp.Length == 0)
            {
                instance = Empty;
                return(true);
            }

            foreach (FunctionParameterToken t in tmp)
            {
                string       valueText    = null;
                LiteralToken literalToken = t.ValueToken as LiteralToken;
                if (literalToken != null)
                {
                    valueText = literalToken.OriginalText;

                    // disallow "{...}" if enableUriTemplateParsing is false (which could have been seen as valid function parameter, e.g. array notation)
                    if (!enableUriTemplateParsing && UriTemplateParser.IsValidTemplateLiteral(valueText))
                    {
                        instance = null;
                        return(false);
                    }
                }
                else
                {
                    DottedIdentifierToken dottedIdentifierToken = t.ValueToken as DottedIdentifierToken; // for enum
                    if (dottedIdentifierToken != null)
                    {
                        valueText = dottedIdentifierToken.Identifier;
                    }
                }

                if (valueText != null)
                {
                    if (t.ParameterName == null)
                    {
                        if (namedValues != null)
                        {
                            instance = null; // We cannot mix named and non-named values.
                            return(false);
                        }

                        CreateIfNull(ref positionalValues);
                        positionalValues.Add(valueText);
                    }
                    else
                    {
                        if (positionalValues != null)
                        {
                            instance = null; // We cannot mix named and non-named values.
                            return(false);
                        }

                        CreateIfNull(ref namedValues);
                        namedValues.Add(t.ParameterName, valueText);
                    }
                }
                else
                {
                    instance = null;
                    return(false);
                }
            }

            instance = new SegmentArgumentParser(namedValues, positionalValues, false, enableUriTemplateParsing);
            return(true);
        }
Ejemplo n.º 15
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        /// <summary>
        /// Building off of a PathSegmentToken, continue parsing any expand options (nested $filter, $expand, etc)
        /// to build up an ExpandTermToken which fully represents the tree that makes up this expand term.
        /// </summary>
        /// <param name="pathToken">The PathSegmentToken representing the parsed expand path whose options we are now parsing.</param>
        /// <param name="optionsText">A string of the text between the parenthesis after an expand option.</param>
        /// <returns>The list of expand term tokens based on the path token, and all available expand options.</returns>
        internal List <ExpandTermToken> BuildExpandTermToken(PathSegmentToken pathToken, string optionsText)
        {
            // Setup a new lexer for parsing the optionsText
            this.lexer = new ExpressionLexer(optionsText ?? "", true /*moveToFirstToken*/, true /*useSemicolonDelimiter*/);

            // $expand option with star only support $ref option, $expand option property could be "*" or "*/$ref", special logic will be adopted.
            if (pathToken.Identifier == UriQueryConstants.Star || (pathToken.Identifier == UriQueryConstants.RefSegment && pathToken.NextToken.Identifier == UriQueryConstants.Star))
            {
                return(BuildStarExpandTermToken(pathToken));
            }

            QueryToken filterOption = null;
            IEnumerable <OrderByToken> orderByOptions = null;
            long?       topOption    = null;
            long?       skipOption   = null;
            bool?       countOption  = null;
            long?       levelsOption = null;
            QueryToken  searchOption = null;
            SelectToken selectOption = null;
            ExpandToken expandOption = null;

            if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.OpenParen)
            {
                // advance past the '('
                this.lexer.NextToken();

                // Check for (), which is not allowed.
                if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.CloseParen)
                {
                    throw new ODataException(ODataErrorStrings.UriParser_MissingExpandOption(pathToken.Identifier));
                }

                // Look for all the supported query options
                while (this.lexer.CurrentToken.Kind != ExpressionTokenKind.CloseParen)
                {
                    string text = this.enableCaseInsensitiveBuiltinIdentifier
                        ? this.lexer.CurrentToken.Text.ToLowerInvariant()
                        : this.lexer.CurrentToken.Text;

                    // Prepend '$' prefix if needed.
                    if (this.enableNoDollarQueryOptions && !text.StartsWith(UriQueryConstants.DollarSign, StringComparison.Ordinal))
                    {
                        text = string.Format(CultureInfo.InvariantCulture, "{0}{1}", UriQueryConstants.DollarSign, text);
                    }

                    switch (text)
                    {
                    case ExpressionConstants.QueryOptionFilter:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string filterText = this.ReadQueryOption();

                        UriQueryExpressionParser filterParser = new UriQueryExpressionParser(this.MaxFilterDepth, enableCaseInsensitiveBuiltinIdentifier);
                        filterOption = filterParser.ParseFilter(filterText);
                        break;
                    }

                    case ExpressionConstants.QueryOptionOrderby:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string orderByText = this.ReadQueryOption();

                        UriQueryExpressionParser orderbyParser = new UriQueryExpressionParser(this.MaxOrderByDepth, enableCaseInsensitiveBuiltinIdentifier);
                        orderByOptions = orderbyParser.ParseOrderBy(orderByText);
                        break;
                    }

                    case ExpressionConstants.QueryOptionTop:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string topText = this.ReadQueryOption();

                        // TryParse requires a non-nullable non-negative long.
                        long top;
                        if (!long.TryParse(topText, out top) || top < 0)
                        {
                            throw new ODataException(ODataErrorStrings.UriSelectParser_InvalidTopOption(topText));
                        }

                        topOption = top;
                        break;
                    }

                    case ExpressionConstants.QueryOptionSkip:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string skipText = this.ReadQueryOption();

                        // TryParse requires a non-nullable non-negative long.
                        long skip;
                        if (!long.TryParse(skipText, out skip) || skip < 0)
                        {
                            throw new ODataException(ODataErrorStrings.UriSelectParser_InvalidSkipOption(skipText));
                        }

                        skipOption = skip;
                        break;
                    }

                    case ExpressionConstants.QueryOptionCount:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string countText = this.ReadQueryOption();
                        switch (countText)
                        {
                        case ExpressionConstants.KeywordTrue:
                        {
                            countOption = true;
                            break;
                        }

                        case ExpressionConstants.KeywordFalse:
                        {
                            countOption = false;
                            break;
                        }

                        default:
                        {
                            throw new ODataException(ODataErrorStrings.UriSelectParser_InvalidCountOption(countText));
                        }
                        }

                        break;
                    }

                    case ExpressionConstants.QueryOptionLevels:
                    {
                        levelsOption = ResolveLevelOption();
                        break;
                    }

                    case ExpressionConstants.QueryOptionSearch:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string searchText = this.ReadQueryOption();

                        SearchParser searchParser = new SearchParser(this.MaxSearchDepth);
                        searchOption = searchParser.ParseSearch(searchText);

                        break;
                    }

                    case ExpressionConstants.QueryOptionSelect:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string selectText = this.ReadQueryOption();

                        SelectExpandParser innerSelectParser = new SelectExpandParser(selectText, this.maxRecursionDepth, enableCaseInsensitiveBuiltinIdentifier);
                        selectOption = innerSelectParser.ParseSelect();
                        break;
                    }

                    case ExpressionConstants.QueryOptionExpand:
                    {
                        // advance to the equal sign
                        this.lexer.NextToken();
                        string expandText = this.ReadQueryOption();

                        // As 2016/1/8, the navigation property is only supported in entity type, and will support in ComplexType in future.
                        IEdmStructuredType targetEntityType = null;
                        if (this.resolver != null && this.parentEntityType != null)
                        {
                            var parentProperty = this.resolver.ResolveProperty(parentEntityType, pathToken.Identifier) as IEdmNavigationProperty;

                            // it is a navigation property, need to find the type.
                            // Like $expand=Friends($expand=Trips($expand=*)), when expandText becomes "Trips($expand=*)",
                            // find navigation property Trips of Friends, then get Entity type of Trips.
                            if (parentProperty != null)
                            {
                                targetEntityType = parentProperty.ToEntityType();
                            }
                        }

                        SelectExpandParser innerExpandParser = new SelectExpandParser(
                            resolver,
                            expandText,
                            targetEntityType,
                            this.maxRecursionDepth - 1,
                            this.enableCaseInsensitiveBuiltinIdentifier,
                            this.enableNoDollarQueryOptions);
                        expandOption = innerExpandParser.ParseExpand();
                        break;
                    }

                    default:
                    {
                        throw new ODataException(ODataErrorStrings.UriSelectParser_TermIsNotValid(this.lexer.ExpressionText));
                    }
                    }
                }

                // Move past the ')'
                this.lexer.NextToken();
            }

            // Either there was no '(' at all or we just read past the ')' so we should be at the end
            if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.End)
            {
                throw new ODataException(ODataErrorStrings.UriSelectParser_TermIsNotValid(this.lexer.ExpressionText));
            }

            // TODO, there should be some check here in case pathToken identifier is $ref, select, expand and levels options are not allowed.
            List <ExpandTermToken> expandTermTokenList = new List <ExpandTermToken>();
            ExpandTermToken        currentToken        = new ExpandTermToken(pathToken, filterOption, orderByOptions, topOption,
                                                                             skipOption, countOption, levelsOption, searchOption, selectOption, expandOption);

            expandTermTokenList.Add(currentToken);

            return(expandTermTokenList);
        }
 /// <summary>
 /// Tries to parse a collection of function parameters. Allows path and filter to share the core algorithm while representing parameters differently.
 /// </summary>
 /// <param name="parser">The UriQueryExpressionParser to read from.</param>
 /// <param name="splitParameters">The parameters if they were successfully split.</param>
 /// <returns>Whether the parameters could be split.</returns>
 internal static bool TrySplitFunctionParameters(this UriQueryExpressionParser parser, out ICollection <FunctionParameterToken> splitParameters)
 {
     return(parser.TrySplitOperationParameters(ExpressionTokenKind.CloseParen, out splitParameters));
 }
Ejemplo n.º 17
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 /// <summary>
 /// Create a new FunctionCallParser.
 /// </summary>
 /// <param name="lexer">Lexer positioned at a function identifier.</param>
 /// <param name="parser">The UriQueryExpressionParser.</param>
 public FunctionCallParser(ExpressionLexer lexer, UriQueryExpressionParser parser)
     : this(lexer, parser, false /* restoreStateIfFail */)
 {
 }
Ejemplo n.º 18
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        /// <summary>
        /// Parses the <paramref name="queryUri"/> and returns a new instance of <see cref="SyntacticTree"/>
        /// describing the query specified by the uri.
        /// </summary>
        /// <param name="queryUri">The absolute URI which holds the query to parse. This must be a path relative to the <paramref name="serviceBaseUri"/>.</param>
        /// <param name="serviceBaseUri">The base URI of the service.</param>
        /// <param name="maxDepth">The maximum depth of any single query part. Security setting to guard against DoS attacks causing stack overflows and such.</param>
        /// <returns>A new instance of <see cref="SyntacticTree"/> which represents the query specified in the <paramref name="queryUri"/>.</returns>
        public static SyntacticTree ParseUri(Uri queryUri, Uri serviceBaseUri, int maxDepth)
        {
            ExceptionUtils.CheckArgumentNotNull(queryUri, "queryUri");
            if (!queryUri.IsAbsoluteUri)
            {
                throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(queryUri), "queryUri");
            }

            ExceptionUtils.CheckArgumentNotNull(serviceBaseUri, "serviceBaseUri");
            if (!serviceBaseUri.IsAbsoluteUri)
            {
                throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(serviceBaseUri), "serviceBaseUri");
            }

            if (maxDepth <= 0)
            {
                throw new ArgumentException(Strings.SyntacticTree_MaxDepthInvalid, "maxDepth");
            }


            UriPathParser pathParser = new UriPathParser(new ODataUriParserSettings()
            {
                PathLimit = maxDepth
            });
            var path = pathParser.ParsePathIntoSegments(queryUri, serviceBaseUri);

            // COMPAT 32: Differencies in query options parsing in WCF DS
            //
            // We allow non-system $ query options in the lexical space.
            // We allow multiple instances of a custom or non-system $ query option in the lexical space.
            // TODO: we need to decide whether we want to allow multiple system $ query options with the same name (OIPI suggests that this is valid); we currently don't.
            List <CustomQueryOptionToken> queryOptions     = QueryOptionUtils.ParseQueryOptions(queryUri);
            IDictionary <string, string>  parameterAliases = queryOptions.GetParameterAliases();

            QueryToken filter      = null;
            string     filterQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FilterQueryOption);

            if (filterQuery != null)
            {
                UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
                filter = expressionParser.ParseFilter(filterQuery);
            }

            IEnumerable <OrderByToken> orderByTokens = null;
            string orderByQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.OrderByQueryOption);

            if (orderByQuery != null)
            {
                UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
                orderByTokens = expressionParser.ParseOrderBy(orderByQuery);
            }

            SelectToken select      = null;
            string      selectQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SelectQueryOption);

            if (selectQuery != null)
            {
                SelectExpandParser selectParser = new SelectExpandParser(selectQuery, ODataUriParserSettings.DefaultSelectExpandLimit);
                select = selectParser.ParseSelect();
            }

            ExpandToken expand      = null;
            string      expandQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.ExpandQueryOption);

            if (expandQuery != null)
            {
                SelectExpandParser expandParser = new SelectExpandParser(expandQuery, ODataUriParserSettings.DefaultSelectExpandLimit);
                expand = expandParser.ParseExpand();
            }

            int?   skip      = null;
            string skipQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SkipQueryOption);

            if (skipQuery != null)
            {
                int skipValue;
                if (!TryUriStringToNonNegativeInteger(skipQuery, out skipValue))
                {
                    throw new ODataException(Strings.SyntacticTree_InvalidSkipQueryOptionValue(skipQuery));
                }

                skip = skipValue;
            }

            int?   top      = null;
            string topQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.TopQueryOption);

            if (topQuery != null)
            {
                int topValue;
                if (!TryUriStringToNonNegativeInteger(topQuery, out topValue))
                {
                    throw new ODataException(Strings.SyntacticTree_InvalidTopQueryOptionValue(topQuery));
                }

                top = topValue;
            }

            string countQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.CountQueryOption);
            bool?  count      = ParseQueryCount(countQuery);

            string format = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FormatQueryOption);

            return(new SyntacticTree(
                       parameterAliases,
                       path,
                       filter,
                       orderByTokens,
                       select,
                       expand,
                       skip,
                       top,
                       count,
                       format,
                       queryOptions.Count == 0 ? null : new ReadOnlyCollection <CustomQueryOptionToken>(queryOptions)));
        }