public static object ConvertFromUriLiteral(string value, ODataVersion version, IEdmModel model, IEdmTypeReference typeReference)
{
Exception exception;
ExpressionToken token;
ExceptionUtils.CheckArgumentNotNull<string>(value, "value");
if ((typeReference != null) && (model == null))
{
throw new ODataException(Microsoft.Data.OData.Strings.ODataUriUtils_ConvertFromUriLiteralTypeRefWithoutModel);
}
if (model == null)
{
model = EdmCoreModel.Instance;
}
ExpressionLexer lexer = new ExpressionLexer(value, false);
if (!lexer.TryPeekNextToken(out token, out exception))
{
return ODataUriConversionUtils.ConvertFromComplexOrCollectionValue(value, version, model, typeReference);
}
object primitiveValue = lexer.ReadLiteralToken();
if (typeReference != null)
{
primitiveValue = ODataUriConversionUtils.VerifyAndCoerceUriPrimitiveLiteral(primitiveValue, model, typeReference, version);
}
if (primitiveValue is ISpatial)
{
ODataVersionChecker.CheckSpatialValue(version);
}
return primitiveValue;
}
/// <summary>
/// Parse an Identifier into the right QueryToken
/// </summary>
/// <param name="parameters">parameters passed in to the UriQueryExpressionParser</param>
/// <param name="functionCallParser">Object to use to handle parsing function calls.</param>
public IdentifierTokenizer(HashSet <string> parameters, IFunctionCallParser functionCallParser)
{
ExceptionUtils.CheckArgumentNotNull(parameters, "parameters");
ExceptionUtils.CheckArgumentNotNull(functionCallParser, "functionCallParser");
this.lexer = functionCallParser.Lexer;
this.parameters = parameters;
this.functionCallParser = functionCallParser;
}
internal string GetIdentifier()
{
if (this.Kind != ExpressionTokenKind.Identifier)
{
throw ExpressionLexer.ParseError(Strings.ExpressionToken_IdentifierExpected(this.Position));
}
return(this.Text);
}
/// <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="lexer">The lexer 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 TrySplitFunctionParameters(this ExpressionLexer lexer, ExpressionTokenKind endTokenKind, out ICollection <FunctionParameterToken> splitParameters)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(lexer != null, "lexer != null");
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();
QueryToken parameterValue;
if (!TryCreateParameterValueToken(lexer.CurrentToken, out parameterValue))
{
throw new ODataException(ODataErrorStrings.ExpressionLexer_SyntaxError(lexer.Position, lexer.ExpressionText));
}
parameters.Add(new FunctionParameterToken(identifier, parameterValue));
// Read the next parameterToken. We should be at the end, or find
// we have a comma followed by something.
lexer.NextToken();
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>
/// Parses a literal.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <returns>The literal query token or null if something else was found.</returns>
internal static LiteralToken TryParseLiteral(ExpressionLexer lexer)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(lexer != null, "lexer != null");
switch (lexer.CurrentToken.Kind)
{
case ExpressionTokenKind.BooleanLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetBoolean(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmBooleanTypeName));
case ExpressionTokenKind.DateTimeLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.DateTime, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDateTimeTypeName));
case ExpressionTokenKind.DateTimeOffsetLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.DateTimeOffset, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDateTimeOffsetTypeName));
case ExpressionTokenKind.TimeLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.Time, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmTimeTypeName));
case ExpressionTokenKind.DecimalLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetDecimal(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDecimalTypeName));
case ExpressionTokenKind.NullLiteral:
return(ParseNullLiteral(lexer));
case ExpressionTokenKind.StringLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetString(true), Microsoft.Data.OData.Metadata.EdmConstants.EdmStringTypeName));
case ExpressionTokenKind.Int64Literal:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetInt64(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmInt64TypeName));
case ExpressionTokenKind.IntegerLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetInt32(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmInt32TypeName));
case ExpressionTokenKind.DoubleLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetDouble(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDoubleTypeName));
case ExpressionTokenKind.SingleLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSingle(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmSingleTypeName));
case ExpressionTokenKind.GuidLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetGuid(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGuidTypeName));
case ExpressionTokenKind.BinaryLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetBinary(true), Microsoft.Data.OData.Metadata.EdmConstants.EdmBinaryTypeName));
case ExpressionTokenKind.GeographyLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geography, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGeographyTypeName));
case ExpressionTokenKind.GeometryLiteral:
return(ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geometry, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGeometryTypeName));
default:
return(null);
}
}
/// <summary>
/// Parses null literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static LiteralToken ParseNullLiteral(ExpressionLexer lexer)
{
Debug.Assert(lexer != null, "lexer != null");
Debug.Assert(lexer.CurrentToken.Kind == ExpressionTokenKind.NullLiteral, "this.lexer.CurrentToken.InternalKind == ExpressionTokenKind.NullLiteral");
LiteralToken result = new LiteralToken(null, lexer.CurrentToken.Text);
lexer.NextToken();
return(result);
}
/// <summary>
/// Parses a literal.
/// Precondition: lexer is at a literal token type: Boolean, DateTime, Decimal, Null, String, Int64, Integer, Double, Single, Guid, Binary.
/// </summary>
/// <returns>The literal query token or null if something else was found.</returns>
private object TryParseLiteral()
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(ExpressionLexer.IsLiteralType(this.CurrentToken.Kind), "TryParseLiteral called when not at a literal type token");
switch (this.CurrentToken.Kind)
{
case ExpressionTokenKind.BooleanLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetBoolean(false)));
case ExpressionTokenKind.DateTimeLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.DateTime, false)));
case ExpressionTokenKind.DecimalLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetDecimal(false)));
case ExpressionTokenKind.NullLiteral:
return(this.ParseNullLiteral());
case ExpressionTokenKind.StringLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetString(true)));
case ExpressionTokenKind.Int64Literal:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetInt64(false)));
case ExpressionTokenKind.IntegerLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetInt32(false)));
case ExpressionTokenKind.DoubleLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetDouble(false)));
case ExpressionTokenKind.SingleLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetSingle(false)));
case ExpressionTokenKind.GuidLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetGuid(false)));
case ExpressionTokenKind.BinaryLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetBinary(true)));
case ExpressionTokenKind.DateTimeOffsetLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetDateTimeOffset(false)));
case ExpressionTokenKind.TimeLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.Time, false)));
case ExpressionTokenKind.GeographyLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geography, false)));
case ExpressionTokenKind.GeometryLiteral:
return(this.ParseTypedLiteral(EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geometry, false)));
}
return(null);
}
/// <summary>Gets the current identifier text.</summary>
/// <returns>The current identifier text.</returns>
internal string GetIdentifier()
{
DebugUtils.CheckNoExternalCallers();
if (this.Kind != ExpressionTokenKind.Identifier)
{
throw ExpressionLexer.ParseError(Strings.ExpressionToken_IdentifierExpected(this.Position));
}
Debug.Assert(this.Text != null, "Text is null");
return(this.Text);
}
/// <summary>
/// Parses the key value literal.
/// </summary>
/// <param name="lexer">The lexer positioned on the key value.</param>
/// <returns>The literal query token.</returns>
private static LiteralQueryToken ParseKeyValueLiteral(ExpressionLexer lexer)
{
Debug.Assert(lexer != null, "lexer != null");
LiteralQueryToken result = UriQueryExpressionParser.TryParseLiteral(lexer);
if (result == null)
{
throw new ODataException(Strings.UriQueryPathParser_InvalidKeyValueLiteral(lexer.CurrentToken.Text));
}
return(result);
}
/// <summary>
/// Parses the $filter expression.
/// </summary>
/// <param name="filter">The $filter expression string to parse.</param>
/// <returns>The lexical token representing the filter.</returns>
internal QueryToken ParseFilter(string filter)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(filter != null, "filter != null");
this.recursionDepth = 0;
this.lexer = new ExpressionLexer(filter, true /*moveToFirstToken*/);
QueryToken result = this.ParseExpression();
this.lexer.ValidateToken(ExpressionTokenKind.End);
return(result);
}
/// <summary>Reads the next token, checks that it is a literal token type, converts to to a Common Language Runtime value as appropriate, and returns the value.</summary>
/// <param name="expressionLexer">The expression lexer.</param>
/// <returns>The value represented by the next token.</returns>
internal static object ReadLiteralToken(this ExpressionLexer expressionLexer)
{
DebugUtils.CheckNoExternalCallers();
expressionLexer.NextToken();
if (expressionLexer.CurrentToken.Kind.IsLiteralType())
{
return(TryParseLiteral(expressionLexer));
}
throw new ODataException(ODataErrorStrings.ExpressionLexer_ExpectedLiteralToken(expressionLexer.CurrentToken.Text));
}
/// <summary>Reads the next token, checks that it is a literal token type, converts to to a Common Language Runtime value as appropriate, and returns the value.</summary>
/// <returns>The value represented by the next token.</returns>
internal object ReadLiteralToken()
{
DebugUtils.CheckNoExternalCallers();
this.NextToken();
if (ExpressionLexer.IsLiteralType(this.CurrentToken.Kind))
{
return(this.TryParseLiteral());
}
throw new ODataException(o.Strings.ExpressionLexer_ExpectedLiteralToken(this.CurrentToken.Text));
}
/// <summary>
/// Parses the $filter expression.
/// </summary>
/// <param name="filter">The $filter expression string to parse.</param>
/// <returns>The lexical token representing the filter.</returns>
internal QueryToken ParseFilter(string filter)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(filter != null, "filter != null");
this.recursionDepth = 0;
this.lexer = CreateLexerForFilterOrOrderByExpression(filter);
QueryToken result = this.ParseExpression();
this.lexer.ValidateToken(ExpressionTokenKind.End);
return(result);
}
/// <summary>
/// Tries to parse a collection of function parameters for path.
/// </summary>
/// <param name="functionName">The function name to use in error messages.</param>
/// <param name="parenthesisExpression">The contents of the parentheses portion of the current path segment.</param>
/// <param name="splitParameters">The parameters if they were successfully split.</param>
/// <returns>Whether the parameters could be split.</returns>
internal static bool TrySplitFunctionParameters(string functionName, string parenthesisExpression, out ICollection <FunctionParameterToken> splitParameters)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(!string.IsNullOrEmpty(parenthesisExpression), "!string.IsNullOrEmpty(parenthesisExpression)");
var lexer = new ExpressionLexer(parenthesisExpression, true /*moveToFirstToken*/, false /*useSemicolonDelimiter*/, true /*parsingFunctionParameters*/);
if (lexer.CurrentToken.IsFunctionParameterToken)
{
splitParameters = null;
return(false);
}
return(TrySplitFunctionParameters(lexer, ExpressionTokenKind.End, out splitParameters));
}
/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="expressionLexer">The expression lexer.</param>
/// <param name="targetTypeReference">Expected type to be parsed.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static object ParseTypedLiteral(this ExpressionLexer expressionLexer, IEdmPrimitiveTypeReference targetTypeReference)
{
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(expressionLexer.CurrentToken.Text, targetTypeReference, out targetValue))
{
string message = ODataErrorStrings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeReference.FullName(),
expressionLexer.CurrentToken.Text,
expressionLexer.CurrentToken.Position,
expressionLexer.ExpressionText);
throw new ODataException(message);
}
expressionLexer.NextToken();
return(targetValue);
}
/// <summary>
/// Parses null literals.
/// </summary>
/// <param name="expressionLexer">The expression lexer.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static object ParseNullLiteral(this ExpressionLexer expressionLexer)
{
Debug.Assert(expressionLexer.CurrentToken.Kind == ExpressionTokenKind.NullLiteral, "this.lexer.CurrentToken.InternalKind == ExpressionTokenKind.NullLiteral");
expressionLexer.NextToken();
ODataUriNullValue nullValue = new ODataUriNullValue();
if (expressionLexer.ExpressionText == ExpressionConstants.KeywordNull)
{
return(nullValue);
}
int nullLiteralLength = ExpressionConstants.LiteralSingleQuote.Length * 2 + ExpressionConstants.KeywordNull.Length;
int startOfTypeIndex = ExpressionConstants.LiteralSingleQuote.Length + ExpressionConstants.KeywordNull.Length;
nullValue.TypeName = expressionLexer.ExpressionText.Substring(startOfTypeIndex, expressionLexer.ExpressionText.Length - nullLiteralLength);
return(nullValue);
}
/// <summary>
/// Parses a literal.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <returns>The literal query token or null if something else was found.</returns>
internal static LiteralQueryToken TryParseLiteral(ExpressionLexer lexer)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(lexer != null, "lexer != null");
switch (lexer.CurrentToken.Kind)
{
case ExpressionTokenKind.BooleanLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetBoolean(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmBooleanTypeName);
case ExpressionTokenKind.DateTimeLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.DateTime, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDateTimeTypeName);
case ExpressionTokenKind.DateTimeOffsetLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.DateTimeOffset, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDateTimeOffsetTypeName);
case ExpressionTokenKind.TimeLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.Time, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmTimeTypeName);
case ExpressionTokenKind.DecimalLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetDecimal(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDecimalTypeName);
case ExpressionTokenKind.NullLiteral:
return ParseNullLiteral(lexer);
case ExpressionTokenKind.StringLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetString(true), Microsoft.Data.OData.Metadata.EdmConstants.EdmStringTypeName);
case ExpressionTokenKind.Int64Literal:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetInt64(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmInt64TypeName);
case ExpressionTokenKind.IntegerLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetInt32(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmInt32TypeName);
case ExpressionTokenKind.DoubleLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetDouble(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmDoubleTypeName);
case ExpressionTokenKind.SingleLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSingle(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmSingleTypeName);
case ExpressionTokenKind.GuidLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetGuid(false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGuidTypeName);
case ExpressionTokenKind.BinaryLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetBinary(true), Microsoft.Data.OData.Metadata.EdmConstants.EdmBinaryTypeName);
case ExpressionTokenKind.GeographyLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geography, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGeographyTypeName);
case ExpressionTokenKind.GeometryLiteral:
return ParseTypedLiteral(lexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geometry, false), Microsoft.Data.OData.Metadata.EdmConstants.EdmGeometryTypeName);
default:
return null;
}
}
/// <summary>
/// Converts the given <paramref name="value"/> to a corresponding CLR type. Expects the
/// <paramref name="value"/> to have already been properly unescaped from an actual Uri.
/// </summary>
/// <param name="value">Value from a Uri to be converted.</param>
/// <param name="version">Version to be compliant with.</param>
/// <param name="model">Optional model to perform verification against.</param>
/// <param name="typeReference">Optional IEdmTypeReference to perform verification against.
/// Callers must provide a <paramref name="model"/> containing this type if it is specified.</param>
/// <returns>A CLR object that the <paramref name="value"/> represents.</returns>
public static object ConvertFromUriLiteral(string value, ODataVersion version, IEdmModel model, IEdmTypeReference typeReference)
{
ExceptionUtils.CheckArgumentNotNull(value, "value");
if (typeReference != null && model == null)
{
throw new ODataException(ODataErrorStrings.ODataUriUtils_ConvertFromUriLiteralTypeRefWithoutModel);
}
if (model == null)
{
model = Microsoft.Data.Edm.Library.EdmCoreModel.Instance;
}
// Let ExpressionLexer try to get a primitive
ExpressionLexer lexer = new ExpressionLexer(value, false /*moveToFirstToken*/, false /*useSemicolonDelimeter*/);
Exception error;
ExpressionToken token;
lexer.TryPeekNextToken(out token, out error);
if (token.Kind == ExpressionTokenKind.BracketedExpression)
{
// Should be a complex or collection value
return(ODataUriConversionUtils.ConvertFromComplexOrCollectionValue(value, version, model, typeReference));
}
object result = lexer.ReadLiteralToken();
// If we have a typeReference then perform verification and convert if necessary
if (typeReference != null)
{
result = ODataUriConversionUtils.VerifyAndCoerceUriPrimitiveLiteral(result, model, typeReference, version);
}
if (result is ISpatial)
{
ODataVersionChecker.CheckSpatialValue(version);
}
return(result);
}
/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <param name="targetTypeReference">Expected type to be parsed.</param>
/// <param name="targetTypeName">The EDM type name of the expected type to be parsed.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static LiteralToken ParseTypedLiteral(ExpressionLexer lexer, IEdmPrimitiveTypeReference targetTypeReference, string targetTypeName)
{
Debug.Assert(lexer != null, "lexer != null");
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(lexer.CurrentToken.Text, targetTypeReference, out targetValue))
{
string message = ODataErrorStrings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeName,
lexer.CurrentToken.Text,
lexer.CurrentToken.Position,
lexer.ExpressionText);
throw ParseError(message);
}
LiteralToken result = new LiteralToken(targetValue, lexer.CurrentToken.Text);
lexer.NextToken();
return(result);
}
/// <summary>
/// Converts the given <paramref name="value"/> to a corresponding CLR type. Expects the
/// <paramref name="value"/> to have already been properly unescaped from an actual Uri.
/// </summary>
/// <param name="value">Value from a Uri to be converted.</param>
/// <param name="version">Version to be compliant with.</param>
/// <param name="model">Optional model to perform verification against.</param>
/// <param name="typeReference">Optional IEdmTypeReference to perform verification against.
/// Callers must provide a <paramref name="model"/> containing this type if it is specified.</param>
/// <returns>A CLR object that the <paramref name="value"/> represents.</returns>
public static object ConvertFromUriLiteral(string value, ODataVersion version, IEdmModel model, IEdmTypeReference typeReference)
{
ExceptionUtils.CheckArgumentNotNull(value, "value");
if (typeReference != null && model == null)
{
throw new ODataException(o.Strings.ODataUriUtils_ConvertFromUriLiteralTypeRefWithoutModel);
}
if (model == null)
{
model = Microsoft.Data.Edm.Library.EdmCoreModel.Instance;
}
// Let ExpressionLexer try to get a primitive
ExpressionLexer lexer = new ExpressionLexer(value, false /*moveToFirstToken*/);
Exception error;
ExpressionToken token;
if (lexer.TryPeekNextToken(out token, out error))
{
object result = lexer.ReadLiteralToken();
// If we have a typeReference then perform verification and convert if necessary
if (typeReference != null)
{
result = ODataUriConversionUtils.VerifyAndCoerceUriPrimitiveLiteral(result, model, typeReference, version);
}
if (result is ISpatial)
{
ODataVersionChecker.CheckSpatialValue(version);
}
return result;
}
// Should be a complex or collection value
return ODataUriConversionUtils.ConvertFromComplexOrCollectionValue(value, version, model, typeReference);
}
/// <summary>
/// Parses the $expand expression.
/// </summary>
/// <param name="expand">The $expand expression string to parse.</param>
/// <returns>The lexical token representing the expand.</returns>
internal ExpandQueryToken ParseExpand(string expand)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(expand != null, "expand != null");
this.lexer = new ExpressionLexer(expand, true /*moveToFirstToken*/);
List <QueryToken> properties = new List <QueryToken>();
while (true)
{
properties.Add(this.ParseExpression());
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
return(new ExpandQueryToken(properties));
}
/// <summary>
/// Parses the $orderby expression.
/// </summary>
/// <param name="orderBy">The $orderby expression string to parse.</param>
/// <returns>The enumeraion of lexical tokens representing order by tokens.</returns>
internal IEnumerable <OrderByToken> ParseOrderBy(string orderBy)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(orderBy != null, "orderBy != null");
this.recursionDepth = 0;
this.lexer = CreateLexerForFilterOrOrderByExpression(orderBy);
List <OrderByToken> orderByTokens = new List <OrderByToken>();
while (true)
{
QueryToken expression = this.ParseExpression();
bool ascending = true;
if (this.TokenIdentifierIs(ExpressionConstants.KeywordAscending))
{
this.lexer.NextToken();
}
else if (this.TokenIdentifierIs(ExpressionConstants.KeywordDescending))
{
this.lexer.NextToken();
ascending = false;
}
OrderByToken orderByToken = new OrderByToken(expression, ascending ? OrderByDirection.Ascending : OrderByDirection.Descending);
orderByTokens.Add(orderByToken);
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
this.lexer.ValidateToken(ExpressionTokenKind.End);
return(new ReadOnlyCollection <OrderByToken>(orderByTokens));
}
/// <summary>
/// Parses the -, not unary operators.
/// </summary>
/// <returns>The lexical token representing the expression.</returns>
private QueryToken ParseUnary()
{
this.RecurseEnter();
if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.Minus || this.lexer.CurrentToken.IdentifierIs(ExpressionConstants.KeywordNot))
{
ExpressionToken operatorToken = this.lexer.CurrentToken;
this.lexer.NextToken();
if (operatorToken.Kind == ExpressionTokenKind.Minus && (ExpressionLexer.IsNumeric(this.lexer.CurrentToken.Kind)))
{
ExpressionToken numberLiteral = this.lexer.CurrentToken;
numberLiteral.Text = "-" + numberLiteral.Text;
numberLiteral.Position = operatorToken.Position;
this.lexer.CurrentToken = numberLiteral;
this.RecurseLeave();
return(this.ParsePrimary());
}
QueryToken operand = this.ParseUnary();
UnaryOperatorKind unaryOperatorKind;
if (operatorToken.Kind == ExpressionTokenKind.Minus)
{
unaryOperatorKind = UnaryOperatorKind.Negate;
}
else
{
Debug.Assert(operatorToken.IdentifierIs(ExpressionConstants.KeywordNot), "Was a new unary operator added?");
unaryOperatorKind = UnaryOperatorKind.Not;
}
this.RecurseLeave();
return(new UnaryOperatorQueryToken(unaryOperatorKind, operand));
}
this.RecurseLeave();
return(this.ParsePrimary());
}
/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <returns>
/// Enumeration of key values or null if there was a syntax error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values.
/// </remarks>
private static IEnumerable <NamedValue> ParseKeyValuesFromUri(string text)
{
Debug.Assert(text != null, "text != null");
//// This is a modified copy of KeyInstance.TryParseFromUri
ExpressionLexer lexer = new ExpressionLexer(text, true /*moveToFirstToken*/);
ExpressionToken currentToken = lexer.CurrentToken;
if (currentToken.Kind == ExpressionTokenKind.End)
{
return(EmptyKeyValues);
}
List <NamedValue> keyValuesList = new List <NamedValue>();
do
{
if (currentToken.Kind == ExpressionTokenKind.Identifier)
{
// Name-value pair.
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Kind != ExpressionTokenKind.Equal)
{
return(null);
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return(null);
}
keyValuesList.Add(new NamedValue(identifier, ParseKeyValueLiteral(lexer)));
}
else if (currentToken.IsKeyValueToken)
{
// Unnamed value.
keyValuesList.Add(new NamedValue(null, ParseKeyValueLiteral(lexer)));
}
else
{
return(null);
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
currentToken = lexer.NextToken();
if (currentToken.Kind == ExpressionTokenKind.Comma)
{
currentToken = lexer.NextToken();
if (currentToken.Kind == ExpressionTokenKind.End)
{
// Trailing comma.
return(null);
}
}
}while (currentToken.Kind != ExpressionTokenKind.End);
return(keyValuesList);
}
/// <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="lexer">The lexer 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 ExpressionLexer lexer, out ICollection <FunctionParameterToken> splitParameters)
{
DebugUtils.CheckNoExternalCallers();
return(lexer.TrySplitFunctionParameters(ExpressionTokenKind.CloseParen, out splitParameters));
}
/// <summary>
/// Parses the $filter expression.
/// </summary>
/// <param name="filter">The $filter expression string to parse.</param>
/// <returns>The lexical token representing the filter.</returns>
internal QueryToken ParseFilter(string filter)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(filter != null, "filter != null");
this.recursionDepth = 0;
this.lexer = new ExpressionLexer(filter, true /*moveToFirstToken*/);
QueryToken result = this.ParseExpression();
this.lexer.ValidateToken(ExpressionTokenKind.End);
return result;
}
/// <summary>
/// Parses the $orderby expression.
/// </summary>
/// <param name="orderBy">The $orderby expression string to parse.</param>
/// <returns>The enumeraion of lexical tokens representing order by tokens.</returns>
internal IEnumerable<OrderByQueryToken> ParseOrderBy(string orderBy)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(orderBy != null, "orderBy != null");
this.recursionDepth = 0;
this.lexer = new ExpressionLexer(orderBy, true /*moveToFirstToken*/);
List<OrderByQueryToken> orderByTokens = new List<OrderByQueryToken>();
while (true)
{
QueryToken expression = this.ParseExpression();
bool ascending = true;
if (this.TokenIdentifierIs(ExpressionConstants.KeywordAscending))
{
this.lexer.NextToken();
}
else if (this.TokenIdentifierIs(ExpressionConstants.KeywordDescending))
{
this.lexer.NextToken();
ascending = false;
}
OrderByQueryToken orderByToken = new OrderByQueryToken(expression, ascending ? OrderByDirection.Ascending : OrderByDirection.Descending);
orderByTokens.Add(orderByToken);
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
this.lexer.ValidateToken(ExpressionTokenKind.End);
return new ReadOnlyCollection<OrderByQueryToken>(orderByTokens);
}
/// <summary>
/// Parses the key value literal.
/// </summary>
/// <param name="lexer">The lexer positioned on the key value.</param>
/// <returns>The literal query token.</returns>
private static LiteralQueryToken ParseKeyValueLiteral(ExpressionLexer lexer)
{
Debug.Assert(lexer != null, "lexer != null");
LiteralQueryToken result = UriQueryExpressionParser.TryParseLiteral(lexer);
if (result == null)
{
throw new ODataException(Strings.UriQueryPathParser_InvalidKeyValueLiteral(lexer.CurrentToken.Text));
}
return result;
}
/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <returns>
/// Enumeration of key values or null if there was a syntax error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values.
/// </remarks>
private static IEnumerable<NamedValue> ParseKeyValuesFromUri(string text)
{
Debug.Assert(text != null, "text != null");
//// This is a modified copy of KeyInstance.TryParseFromUri
ExpressionLexer lexer = new ExpressionLexer(text, true /*moveToFirstToken*/);
ExpressionToken currentToken = lexer.CurrentToken;
if (currentToken.Kind == ExpressionTokenKind.End)
{
return EmptyKeyValues;
}
List<NamedValue> keyValuesList = new List<NamedValue>();
do
{
if (currentToken.Kind == ExpressionTokenKind.Identifier)
{
// Name-value pair.
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Kind != ExpressionTokenKind.Equal)
{
return null;
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return null;
}
keyValuesList.Add(new NamedValue(identifier, ParseKeyValueLiteral(lexer)));
}
else if (currentToken.IsKeyValueToken)
{
// Unnamed value.
keyValuesList.Add(new NamedValue(null, ParseKeyValueLiteral(lexer)));
}
else
{
return null;
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
currentToken = lexer.NextToken();
if (currentToken.Kind == ExpressionTokenKind.Comma)
{
currentToken = lexer.NextToken();
if (currentToken.Kind == ExpressionTokenKind.End)
{
// Trailing comma.
return null;
}
}
}
while (currentToken.Kind != ExpressionTokenKind.End);
return keyValuesList;
}
/// <summary>
/// Parses the $expand expression.
/// </summary>
/// <param name="expand">The $expand expression string to parse.</param>
/// <returns>The lexical token representing the expand.</returns>
internal ExpandQueryToken ParseExpand(string expand)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(expand != null, "expand != null");
this.lexer = new ExpressionLexer(expand, true /*moveToFirstToken*/);
List<QueryToken> properties = new List<QueryToken>();
while (true)
{
properties.Add(this.ParseExpression());
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
return new ExpandQueryToken(properties);
}
/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <param name="targetTypeReference">Expected type to be parsed.</param>
/// <param name="targetTypeName">The EDM type name of the expected type to be parsed.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static LiteralQueryToken ParseTypedLiteral(ExpressionLexer lexer, IEdmPrimitiveTypeReference targetTypeReference, string targetTypeName)
{
Debug.Assert(lexer != null, "lexer != null");
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(lexer.CurrentToken.Text, targetTypeReference, out targetValue))
{
string message = Strings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeName,
lexer.CurrentToken.Text,
lexer.CurrentToken.Position,
lexer.ExpressionText);
throw ParseError(message);
}
LiteralQueryToken result = new LiteralQueryToken(targetValue, lexer.CurrentToken.Text);
lexer.NextToken();
return result;
}
/// <summary>
/// Parses null literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private static LiteralQueryToken ParseNullLiteral(ExpressionLexer lexer)
{
Debug.Assert(lexer != null, "lexer != null");
Debug.Assert(lexer.CurrentToken.Kind == ExpressionTokenKind.NullLiteral, "this.lexer.CurrentToken.Kind == ExpressionTokenKind.NullLiteral");
LiteralQueryToken result = new LiteralQueryToken(null, lexer.CurrentToken.Text);
lexer.NextToken();
return result;
}
/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name="allowNamedValues">Set to true if the parser should accept named values
/// so syntax like Name='value'. If this is false, the parsing will fail on such constructs.</param>
/// <param name="allowNull">Set to true if the parser should accept null values.
/// If set to false, the parser will fail on null values.</param>
/// <param name='instance'>After invocation, the parsed key instance.</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, bool allowNamedValues, bool allowNull, out SegmentArgumentParser instance)
{
Debug.Assert(text != null, "text != null");
Dictionary <string, string> namedValues = null;
List <string> positionalValues = null;
ExpressionLexer lexer = new ExpressionLexer(text, true, false);
ExpressionToken currentToken = lexer.CurrentToken;
if (currentToken.Kind == ExpressionTokenKind.End)
{
instance = Empty;
return(true);
}
instance = null;
do
{
if (currentToken.Kind == ExpressionTokenKind.Identifier && allowNamedValues)
{
// Name-value pair.
if (positionalValues != null)
{
// We cannot mix named and non-named values.
return(false);
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Kind != ExpressionTokenKind.Equal)
{
return(false);
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return(false);
}
string namedValue = lexer.CurrentToken.Text;
CreateIfNull(ref namedValues);
if (namedValues.ContainsKey(identifier))
{
// Duplicate name.
return(false);
}
namedValues.Add(identifier, namedValue);
}
else if (currentToken.IsKeyValueToken || (allowNull && currentToken.Kind == ExpressionTokenKind.NullLiteral))
{
// Positional value.
if (namedValues != null)
{
// We cannot mix named and non-named values.
return(false);
}
CreateIfNull(ref positionalValues);
positionalValues.Add(lexer.CurrentToken.Text);
}
else
{
return(false);
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Kind == ExpressionTokenKind.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Kind == ExpressionTokenKind.End)
{
// Trailing comma.
return(false);
}
}
}while (currentToken.Kind != ExpressionTokenKind.End);
instance = new SegmentArgumentParser(namedValues, positionalValues, false);
return(true);
}
/// <summary>
/// Create a SelectExpandTermParser
/// </summary>
/// <param name="clauseToParse">the clause to parse</param>
/// <param name="maxDepth">the maximum recursive depth</param>
protected SelectExpandTermParser(string clauseToParse, int maxDepth)
{
this.maxDepth = maxDepth;
this.recursionDepth = 0;
this.Lexer = clauseToParse != null ? new ExpressionLexer(clauseToParse, false, true) : null;
}
