/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <param name="targetType">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, Type targetType, string targetTypeName)
{
Debug.Assert(lexer != null, "lexer != null");
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(lexer.CurrentToken.Text, targetType, out targetValue))
{
string message = Strings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeName,
lexer.CurrentToken.Text,
lexer.CurrentToken.Position,
lexer.ExpressionText);
throw ParseError(message);
}
LiteralQueryToken result = new LiteralQueryToken()
{
Value = targetValue,
OriginalText = lexer.CurrentToken.Text
};
lexer.NextToken();
return(result);
}
/// <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, typeof(bool), EdmConstants.EdmBooleanTypeName);
case ExpressionTokenKind.DateTimeLiteral:
return ParseTypedLiteral(lexer, typeof(DateTime), EdmConstants.EdmDateTimeTypeName);
case ExpressionTokenKind.DecimalLiteral:
return ParseTypedLiteral(lexer, typeof(decimal), EdmConstants.EdmDecimalTypeName);
case ExpressionTokenKind.NullLiteral:
return ParseNullLiteral(lexer);
case ExpressionTokenKind.StringLiteral:
return ParseTypedLiteral(lexer, typeof(string), EdmConstants.EdmStringTypeName);
case ExpressionTokenKind.Int64Literal:
return ParseTypedLiteral(lexer, typeof(Int64), EdmConstants.EdmInt64TypeName);
case ExpressionTokenKind.IntegerLiteral:
return ParseTypedLiteral(lexer, typeof(Int32), EdmConstants.EdmInt32TypeName);
case ExpressionTokenKind.DoubleLiteral:
return ParseTypedLiteral(lexer, typeof(double), EdmConstants.EdmDoubleTypeName);
case ExpressionTokenKind.SingleLiteral:
return ParseTypedLiteral(lexer, typeof(Single), EdmConstants.EdmSingleTypeName);
case ExpressionTokenKind.GuidLiteral:
return ParseTypedLiteral(lexer, typeof(Guid), EdmConstants.EdmGuidTypeName);
case ExpressionTokenKind.BinaryLiteral:
return ParseTypedLiteral(lexer, typeof(byte[]), EdmConstants.EdmBinaryTypeName);
default:
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));
}
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 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()
{
Value = null,
OriginalText = lexer.CurrentToken.Text
};
lexer.NextToken();
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);
QueryToken result = this.ParseExpression();
this.lexer.ValidateToken(ExpressionTokenKind.End);
return(result);
}
/// <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, typeof(bool), EdmConstants.EdmBooleanTypeName));
case ExpressionTokenKind.DateTimeLiteral:
return(ParseTypedLiteral(lexer, typeof(DateTime), EdmConstants.EdmDateTimeTypeName));
case ExpressionTokenKind.DecimalLiteral:
return(ParseTypedLiteral(lexer, typeof(decimal), EdmConstants.EdmDecimalTypeName));
case ExpressionTokenKind.NullLiteral:
return(ParseNullLiteral(lexer));
case ExpressionTokenKind.StringLiteral:
return(ParseTypedLiteral(lexer, typeof(string), EdmConstants.EdmStringTypeName));
case ExpressionTokenKind.Int64Literal:
return(ParseTypedLiteral(lexer, typeof(Int64), EdmConstants.EdmInt64TypeName));
case ExpressionTokenKind.IntegerLiteral:
return(ParseTypedLiteral(lexer, typeof(Int32), EdmConstants.EdmInt32TypeName));
case ExpressionTokenKind.DoubleLiteral:
return(ParseTypedLiteral(lexer, typeof(double), EdmConstants.EdmDoubleTypeName));
case ExpressionTokenKind.SingleLiteral:
return(ParseTypedLiteral(lexer, typeof(Single), EdmConstants.EdmSingleTypeName));
case ExpressionTokenKind.GuidLiteral:
return(ParseTypedLiteral(lexer, typeof(Guid), EdmConstants.EdmGuidTypeName));
case ExpressionTokenKind.BinaryLiteral:
return(ParseTypedLiteral(lexer, typeof(byte[]), EdmConstants.EdmBinaryTypeName));
default:
return(null);
}
}
/// <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);
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()
{
Direction = ascending ? OrderByDirection.Ascending : OrderByDirection.Descending,
Expression = expression
};
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 -, 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()
{
OperatorKind = unaryOperatorKind,
Operand = operand
});
}
this.RecurseLeave();
return(this.ParsePrimary());
}
/// <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);
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() { Name = identifier, Value = ParseKeyValueLiteral(lexer) });
}
else if (currentToken.IsKeyValueToken)
{
// Unnamed value.
keyValuesList.Add(new NamedValue() { Value = 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>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);
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()
{
Name = identifier, Value = ParseKeyValueLiteral(lexer)
});
}
else if (currentToken.IsKeyValueToken)
{
// Unnamed value.
keyValuesList.Add(new NamedValue()
{
Value = 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 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()
{
Value = null,
OriginalText = lexer.CurrentToken.Text
};
lexer.NextToken();
return result;
}
/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="lexer">The lexer to use.</param>
/// <param name="targetType">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, Type targetType, string targetTypeName)
{
Debug.Assert(lexer != null, "lexer != null");
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(lexer.CurrentToken.Text, targetType, out targetValue))
{
string message = Strings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeName,
lexer.CurrentToken.Text,
lexer.CurrentToken.Position,
lexer.ExpressionText);
throw ParseError(message);
}
LiteralQueryToken result = new LiteralQueryToken()
{
Value = targetValue,
OriginalText = lexer.CurrentToken.Text
};
lexer.NextToken();
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);
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()
{
Direction = ascending ? OrderByDirection.Ascending : OrderByDirection.Descending,
Expression = expression
};
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 $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);
QueryToken result = this.ParseExpression();
this.lexer.ValidateToken(ExpressionTokenKind.End);
return result;
}
