/// <summary>
/// Check whether the current identifier is a function. If so, expand the token text to the function signature
/// </summary>
/// <returns>True if the current identifier is a function call</returns>
internal bool ExpandIdentifierAsFunction()
{
// FUNCTION := (<ID> {<DOT>}) ... <ID> <OpenParen>
// if we fail to match then we leave the token as it
ExpressionTokenKind id = this.token.Kind;
if (id != ExpressionTokenKind.Identifier)
{
return false;
}
int savedTextPos = this.textPos;
char? savedChar = this.ch;
ExpressionToken savedToken = this.token;
bool savedIgnoreWs = this.ignoreWhitespace;
this.ignoreWhitespace = false;
// Expansion left anchor
int tokenStartPos = this.token.Position;
while (this.ExpandWhenMatch(ExpressionTokenKind.Dot) && this.ExpandWhenMatch(ExpressionTokenKind.Identifier))
{
}
bool matched = this.CurrentToken.Kind == ExpressionTokenKind.Identifier && this.PeekNextToken().Kind == ExpressionTokenKind.OpenParen;
if (matched)
{
this.token.Text = this.text.Substring(tokenStartPos, this.textPos - tokenStartPos);
this.token.Position = tokenStartPos;
}
else
{
this.textPos = savedTextPos;
this.ch = savedChar;
this.token = savedToken;
}
this.ignoreWhitespace = savedIgnoreWs;
return matched;
}
/// <summary>Returns the next token without advancing the lexer.</summary>
/// <returns>The next token.</returns>
internal ExpressionToken PeekNextToken()
{
int savedTextPos = this.textPos;
char? savedChar = this.ch;
ExpressionToken savedToken = this.token;
this.NextToken();
ExpressionToken result = this.token;
this.textPos = savedTextPos;
this.ch = savedChar;
this.token = savedToken;
return result;
}
/// <summary>
/// Tries to create a <see cref="ConstantNode"/> for the given token if it represents a literal.
/// </summary>
/// <param name="token">The token.</param>
/// <param name="node">The node, if one was created.</param>
/// <returns>Whether or not the token represented a literal.</returns>
internal static bool TryCreateLiteral(ExpressionToken token, out ConstantNode node)
{
switch (token.Kind)
{
case ExpressionTokenKind.NullLiteral:
node = new ConstantNode(null);
break;
case ExpressionTokenKind.BooleanLiteral:
node = ParseTypedLiteral(typeof(bool), XmlConstants.EdmBooleanTypeName, token);
break;
case ExpressionTokenKind.DecimalLiteral:
node = ParseTypedLiteral(typeof(decimal), XmlConstants.EdmDecimalTypeName, token);
break;
case ExpressionTokenKind.StringLiteral:
node = ParseTypedLiteral(typeof(string), XmlConstants.EdmStringTypeName, token);
break;
case ExpressionTokenKind.Int64Literal:
node = ParseTypedLiteral(typeof(Int64), XmlConstants.EdmInt64TypeName, token);
break;
case ExpressionTokenKind.IntegerLiteral:
node = ParseTypedLiteral(typeof(Int32), XmlConstants.EdmInt32TypeName, token);
break;
case ExpressionTokenKind.DoubleLiteral:
node = ParseTypedLiteral(typeof(double), XmlConstants.EdmDoubleTypeName, token);
break;
case ExpressionTokenKind.SingleLiteral:
node = ParseTypedLiteral(typeof(Single), XmlConstants.EdmSingleTypeName, token);
break;
case ExpressionTokenKind.GuidLiteral:
node = ParseTypedLiteral(typeof(Guid), XmlConstants.EdmGuidTypeName, token);
break;
case ExpressionTokenKind.BinaryLiteral:
node = ParseTypedLiteral(typeof(byte[]), XmlConstants.EdmBinaryTypeName, token);
break;
case ExpressionTokenKind.DurationLiteral:
node = ParseTypedLiteral(typeof(TimeSpan), XmlConstants.EdmDurationTypeName, token);
break;
case ExpressionTokenKind.DateTimeOffsetLiteral:
node = ParseTypedLiteral(typeof(DateTimeOffset), XmlConstants.EdmDateTimeOffsetTypeName, token);
break;
case ExpressionTokenKind.GeographylLiteral:
node = ParseTypedLiteral(typeof(Geography), XmlConstants.EdmGeographyTypeName, token);
break;
case ExpressionTokenKind.GeometryLiteral:
node = ParseTypedLiteral(typeof(Geometry), XmlConstants.EdmGeometryTypeName, token);
break;
default:
node = null;
return(false);
}
Debug.Assert(token.IsLiteral, "Token must be a value.");
return(true);
}
/// <summary>
/// Parses the given token into a constant node of the given target type.
/// </summary>
/// <param name="targetType">The tarket type.</param>
/// <param name="targetTypeName">The target type name.</param>
/// <param name="token">The token to parse.</param>
/// <returns>The parsed constant node.</returns>
private static ConstantNode ParseTypedLiteral(Type targetType, string targetTypeName, ExpressionToken token)
{
object literalValue;
if (!LiteralParser.ForExpressions.TryParseLiteral(targetType, token.Text, out literalValue))
{
string message = Strings.RequestQueryParser_UnrecognizedLiteral(targetTypeName, token.Text);
throw DataServiceException.CreateSyntaxError(message);
}
return(new ConstantNode(literalValue, token.Text));
}
/// <summary>
/// Tries to create a <see cref="ConstantNode"/> for the given token if it represents a literal.
/// </summary>
/// <param name="token">The token.</param>
/// <param name="node">The node, if one was created.</param>
/// <returns>Whether or not the token represented a literal.</returns>
internal static bool TryCreateLiteral(ExpressionToken token, out ConstantNode node)
{
switch (token.Kind)
{
case ExpressionTokenKind.NullLiteral:
node = new ConstantNode(null);
break;
case ExpressionTokenKind.BooleanLiteral:
node = ParseTypedLiteral(typeof(bool), XmlConstants.EdmBooleanTypeName, token);
break;
case ExpressionTokenKind.DecimalLiteral:
node = ParseTypedLiteral(typeof(decimal), XmlConstants.EdmDecimalTypeName, token);
break;
case ExpressionTokenKind.StringLiteral:
node = ParseTypedLiteral(typeof(string), XmlConstants.EdmStringTypeName, token);
break;
case ExpressionTokenKind.Int64Literal:
node = ParseTypedLiteral(typeof(Int64), XmlConstants.EdmInt64TypeName, token);
break;
case ExpressionTokenKind.IntegerLiteral:
node = ParseTypedLiteral(typeof(Int32), XmlConstants.EdmInt32TypeName, token);
break;
case ExpressionTokenKind.DoubleLiteral:
node = ParseTypedLiteral(typeof(double), XmlConstants.EdmDoubleTypeName, token);
break;
case ExpressionTokenKind.SingleLiteral:
node = ParseTypedLiteral(typeof(Single), XmlConstants.EdmSingleTypeName, token);
break;
case ExpressionTokenKind.GuidLiteral:
node = ParseTypedLiteral(typeof(Guid), XmlConstants.EdmGuidTypeName, token);
break;
case ExpressionTokenKind.BinaryLiteral:
node = ParseTypedLiteral(typeof(byte[]), XmlConstants.EdmBinaryTypeName, token);
break;
case ExpressionTokenKind.DurationLiteral:
node = ParseTypedLiteral(typeof(TimeSpan), XmlConstants.EdmDurationTypeName, token);
break;
case ExpressionTokenKind.DateTimeOffsetLiteral:
node = ParseTypedLiteral(typeof(DateTimeOffset), XmlConstants.EdmDateTimeOffsetTypeName, token);
break;
case ExpressionTokenKind.GeographylLiteral:
node = ParseTypedLiteral(typeof(Geography), XmlConstants.EdmGeographyTypeName, token);
break;
case ExpressionTokenKind.GeometryLiteral:
node = ParseTypedLiteral(typeof(Geometry), XmlConstants.EdmGeometryTypeName, token);
break;
default:
node = null;
return false;
}
Debug.Assert(token.IsLiteral, "Token must be a value.");
return true;
}
/// <summary>
/// Parses the given token into a constant node of the given target type.
/// </summary>
/// <param name="targetType">The tarket type.</param>
/// <param name="targetTypeName">The target type name.</param>
/// <param name="token">The token to parse.</param>
/// <returns>The parsed constant node.</returns>
private static ConstantNode ParseTypedLiteral(Type targetType, string targetTypeName, ExpressionToken token)
{
object literalValue;
if (!LiteralParser.ForExpressions.TryParseLiteral(targetType, token.Text, out literalValue))
{
string message = Strings.RequestQueryParser_UnrecognizedLiteral(targetTypeName, token.Text);
throw DataServiceException.CreateSyntaxError(message);
}
return new ConstantNode(literalValue, token.Text);
}
