/// <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;
string reason;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(expressionLexer.CurrentToken.Text, targetTypeReference, out targetValue, out reason))
{
string message;
if (reason == null)
{
message = ODataErrorStrings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeReference.FullName(),
expressionLexer.CurrentToken.Text,
expressionLexer.CurrentToken.Position,
expressionLexer.ExpressionText);
}
else
{
message = ODataErrorStrings.UriQueryExpressionParser_UnrecognizedLiteralWithReason(
targetTypeReference.FullName(),
expressionLexer.CurrentToken.Text,
expressionLexer.CurrentToken.Position,
expressionLexer.ExpressionText,
reason);
}
throw new ODataException(message);
}
expressionLexer.NextToken();
return(targetValue);
}
/// <summary>
/// Parses a literal.
/// Precondition: lexer is at a literal token type: Boolean, DateTime, Decimal, Null, String, Int64, Integer, Double, Single, Guid, Binary.
/// </summary>
/// <param name="expressionLexer">The expression lexer.</param>
/// <returns>The literal query token or null if something else was found.</returns>
private static object TryParseLiteral(this ExpressionLexer expressionLexer)
{
Debug.Assert(expressionLexer.CurrentToken.Kind.IsLiteralType(), "TryParseLiteral called when not at a literal type token");
switch (expressionLexer.CurrentToken.Kind)
{
case ExpressionTokenKind.BooleanLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetBoolean(false)));
case ExpressionTokenKind.DecimalLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetDecimal(false)));
case ExpressionTokenKind.NullLiteral:
return(ParseNullLiteral(expressionLexer));
case ExpressionTokenKind.StringLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetString(true)));
case ExpressionTokenKind.Int64Literal:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetInt64(false)));
case ExpressionTokenKind.IntegerLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetInt32(false)));
case ExpressionTokenKind.DoubleLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetDouble(false)));
case ExpressionTokenKind.SingleLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetSingle(false)));
case ExpressionTokenKind.GuidLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetGuid(false)));
case ExpressionTokenKind.BinaryLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetBinary(true)));
case ExpressionTokenKind.DateLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetDate(false)));
case ExpressionTokenKind.DateTimeOffsetLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetDateTimeOffset(false)));
case ExpressionTokenKind.DurationLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetTemporal(EdmPrimitiveTypeKind.Duration, false)));
case ExpressionTokenKind.GeographyLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geography, false)));
case ExpressionTokenKind.GeometryLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetSpatial(EdmPrimitiveTypeKind.Geometry, false)));
case ExpressionTokenKind.QuotedLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetString(true)));
case ExpressionTokenKind.TimeOfDayLiteral:
return(ParseTypedLiteral(expressionLexer, EdmCoreModel.Instance.GetTimeOfDay(false)));
}
return(null);
}
/// <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();
ODataNullValue nullValue = new ODataNullValue();
return(nullValue);
}
/// <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)
{
expressionLexer.NextToken();
if (expressionLexer.CurrentToken.Kind.IsLiteralType())
{
return(TryParseLiteral(expressionLexer));
}
throw new ODataException(ODataErrorStrings.ExpressionLexer_ExpectedLiteralToken(expressionLexer.CurrentToken.Text));
}
/// <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 or an EnumNode.</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.OData.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));
}
QueryNode enumConstNode;
if ((token.Kind == ExpressionTokenKind.Identifier) && // then try parsing the entire text as enum value
EnumBinder.TryBindIdentifier(lexer.ExpressionText, null, model, out enumConstNode))
{
return(((ConstantNode)enumConstNode).Value);
}
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);
}
return(result);
}
