/// <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>
/// Try to parse a string value into a non-negative integer.
/// </summary>
/// <param name="text">The string value to parse.</param>
/// <param name="nonNegativeInteger">The non-negative integer value parsed from the <paramref name="text"/>.</param>
/// <returns>True if <paramref name="text"/> could successfully be parsed into a non-negative integer; otherwise returns false.</returns>
internal static bool TryUriStringToNonNegativeInteger(string text, out int nonNegativeInteger)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(text != null, "text != null");
object valueAsObject;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(text, typeof(int), out valueAsObject))
{
nonNegativeInteger = -1;
return(false);
}
nonNegativeInteger = (int)valueAsObject;
if (nonNegativeInteger < 0)
{
return(false);
}
return(true);
}
/// <summary>
/// Parses the <paramref name="queryUri"/> and returns a new instance of <see cref="QueryDescriptorQueryToken"/>
/// 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="QueryDescriptorQueryToken"/> which represents the query specified in the <paramref name="queryUri"/>.</returns>
public static QueryDescriptorQueryToken ParseUri(Uri queryUri, Uri serviceBaseUri, int maxDepth)
{
ExceptionUtils.CheckArgumentNotNull(queryUri, "queryUri");
if (!queryUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.QueryDescriptorQueryToken_UriMustBeAbsolute(queryUri), "queryUri");
}
ExceptionUtils.CheckArgumentNotNull(serviceBaseUri, "serviceBaseUri");
if (!serviceBaseUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.QueryDescriptorQueryToken_UriMustBeAbsolute(serviceBaseUri), "serviceBaseUri");
}
if (maxDepth <= 0)
{
throw new ArgumentException(Strings.QueryDescriptorQueryToken_MaxDepthInvalid, "maxDepth");
}
QueryDescriptorQueryToken queryDescriptor = new QueryDescriptorQueryToken();
UriQueryPathParser pathParser = new UriQueryPathParser(maxDepth);
queryDescriptor.Path = pathParser.ParseUri(queryUri, serviceBaseUri);
List <QueryOptionQueryToken> queryOptions = HttpUtils.ParseQueryOptions(queryUri);
string filter = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FilterQueryOption);
if (filter != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
queryDescriptor.Filter = expressionParser.ParseFilter(filter);
}
string orderBy = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.OrderByQueryOption);
if (orderBy != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
queryDescriptor.OrderByTokens = expressionParser.ParseOrderBy(orderBy);
}
string skip = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SkipQueryOption);
if (skip != null)
{
int skipValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(skip, out skipValue))
{
throw new ODataException(Strings.QueryDescriptorQueryToken_InvalidSkipQueryOptionValue(skip));
}
queryDescriptor.Skip = skipValue;
}
string top = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.TopQueryOption);
if (top != null)
{
int topValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(top, out topValue))
{
throw new ODataException(Strings.QueryDescriptorQueryToken_InvalidTopQueryOptionValue(top));
}
queryDescriptor.Top = topValue;
}
// the remaining query options are stored on the query descriptor
queryDescriptor.QueryOptions = queryOptions.Count == 0 ? null : new ReadOnlyCollection <QueryOptionQueryToken>(queryOptions);
return(queryDescriptor);
}
/// <summary>Parses a token that starts with a digit.</summary>
/// <returns>The kind of token recognized.</returns>
private ExpressionTokenKind ParseFromDigit()
{
Debug.Assert(Char.IsDigit(this.ch), "Char.IsDigit(this.ch)");
ExpressionTokenKind result;
char startChar = this.ch;
this.NextChar();
if (startChar == '0' && this.ch == 'x' || this.ch == 'X')
{
result = ExpressionTokenKind.BinaryLiteral;
do
{
this.NextChar();
}while (UriPrimitiveTypeParser.IsCharHexDigit(this.ch));
}
else
{
result = ExpressionTokenKind.IntegerLiteral;
while (Char.IsDigit(this.ch))
{
this.NextChar();
}
if (this.ch == '.')
{
result = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
this.ValidateDigit();
do
{
this.NextChar();
}while (Char.IsDigit(this.ch));
}
if (this.ch == 'E' || this.ch == 'e')
{
result = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
if (this.ch == '+' || this.ch == '-')
{
this.NextChar();
}
this.ValidateDigit();
do
{
this.NextChar();
}while (Char.IsDigit(this.ch));
}
if (this.ch == 'M' || this.ch == 'm')
{
result = ExpressionTokenKind.DecimalLiteral;
this.NextChar();
}
else
if (this.ch == 'd' || this.ch == 'D')
{
result = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
}
else if (this.ch == 'L' || this.ch == 'l')
{
result = ExpressionTokenKind.Int64Literal;
this.NextChar();
}
else if (this.ch == 'f' || this.ch == 'F')
{
result = ExpressionTokenKind.SingleLiteral;
this.NextChar();
}
}
return(result);
}