/// <summary>
/// Tries to convert the given text into this parser's expected type. Conversion only, formatting should already have been removed.
/// </summary>
/// <param name="text">The text to convert.</param>
/// <param name="targetValue">The target value.</param>
/// <returns>
/// Whether or not conversion was successful.
/// </returns>
internal override bool TryConvert(string text, out object targetValue)
{
DebugUtils.CheckNoExternalCallers();
// must be of even length.
if ((text.Length % 2) != 0)
{
targetValue = null;
return(false);
}
byte[] result = new byte[text.Length / 2];
int resultIndex = 0;
int textIndex = 0;
while (resultIndex < result.Length)
{
char ch0 = text[textIndex];
char ch1 = text[textIndex + 1];
if (!UriPrimitiveTypeParser.IsCharHexDigit(ch0) || !UriPrimitiveTypeParser.IsCharHexDigit(ch1))
{
targetValue = null;
return(false);
}
result[resultIndex] = (byte)((byte)(HexCharToNibble(ch0) << 4) + HexCharToNibble(ch1));
textIndex += 2;
resultIndex++;
}
targetValue = result;
return(true);
}
/// <summary>
/// Tries to remove formatting specific to this parser's expected type.
/// </summary>
/// <param name="text">The text to remove formatting from.</param>
/// <returns>Whether or not the expected formatting was found and succesfully removed.</returns>
internal virtual bool TryRemoveFormatting(ref string text)
{
DebugUtils.CheckNoExternalCallers();
if (this.prefix != null)
{
if (!UriPrimitiveTypeParser.TryRemovePrefix(this.prefix, ref text))
{
return(false);
}
}
bool shouldBeQuoted = this.prefix != null || ValueOfTypeCanContainQuotes(this.expectedType);
if (shouldBeQuoted && !UriPrimitiveTypeParser.TryRemoveQuotes(ref text))
{
return(false);
}
if (this.suffix != null)
{
// we need to try to remove the literal even if it isn't required.
if (!TryRemoveLiteralSuffix(this.suffix, ref text) && this.suffixRequired)
{
return(false);
}
}
return(true);
}
private object ParseTypedLiteral(IEdmPrimitiveTypeReference targetTypeReference)
{
object obj2;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(this.CurrentToken.Text, targetTypeReference, out obj2))
{
throw ParseError(Microsoft.Data.OData.Strings.UriQueryExpressionParser_UnrecognizedLiteral(targetTypeReference.FullName(), this.CurrentToken.Text, this.CurrentToken.Position, this.ExpressionText));
}
this.NextToken();
return(obj2);
}
/// <summary>
/// Tries to remove formatting specific to this parser's expected type.
/// </summary>
/// <param name="text">The text to remove formatting from.</param>
/// <returns>
/// Whether or not the expected formatting was found and succesfully removed.
/// </returns>
internal override bool TryRemoveFormatting(ref string text)
{
DebugUtils.CheckNoExternalCallers();
if (!UriPrimitiveTypeParser.TryRemovePrefix(ExpressionConstants.LiteralPrefixBinary, ref text) &&
!UriPrimitiveTypeParser.TryRemovePrefix(ExpressionConstants.LiteralPrefixShortBinary, ref text))
{
return(false);
}
if (!UriPrimitiveTypeParser.TryRemoveQuotes(ref text))
{
return(false);
}
return(true);
}
/// <summary>
/// Parses typed literals.
/// </summary>
/// <param name="targetTypeReference">Expected type to be parsed.</param>
/// <returns>The literal token produced by building the given literal.</returns>
private object ParseTypedLiteral(IEdmPrimitiveTypeReference targetTypeReference)
{
object targetValue;
if (!UriPrimitiveTypeParser.TryUriStringToPrimitive(this.CurrentToken.Text, targetTypeReference, out targetValue))
{
string message = o.Strings.UriQueryExpressionParser_UnrecognizedLiteral(
targetTypeReference.FullName(),
this.CurrentToken.Text,
this.CurrentToken.Position,
this.ExpressionText);
throw ParseError(message);
}
this.NextToken();
return(targetValue);
}
/// <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 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>
/// 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, EdmCoreModel.Instance.GetInt32(false), out valueAsObject))
{
nonNegativeInteger = -1;
return(false);
}
nonNegativeInteger = (int)valueAsObject;
if (nonNegativeInteger < 0)
{
return(false);
}
return(true);
}
/// <summary>Parses a token that starts with a digit.</summary>
/// <returns>The kind of token recognized.</returns>
private ExpressionTokenKind ParseFromDigit()
{
Debug.Assert(this.IsValidDigit, "this.IsValidDigit");
ExpressionTokenKind result;
char startChar = this.ch.Value;
this.NextChar();
if (startChar == '0' && this.ch == 'x' || this.ch == 'X')
{
result = ExpressionTokenKind.BinaryLiteral;
do
{
this.NextChar();
}while (this.ch.HasValue && UriPrimitiveTypeParser.IsCharHexDigit(this.ch.Value));
}
else
{
result = ExpressionTokenKind.IntegerLiteral;
while (this.IsValidDigit)
{
this.NextChar();
}
if (this.ch == '.')
{
result = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
this.ValidateDigit();
do
{
this.NextChar();
}while (this.IsValidDigit);
}
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 (this.IsValidDigit);
}
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);
}
/// <summary>
/// Parses the <paramref name="queryUri"/> and returns a new instance of <see cref="SyntacticTree"/>
/// 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="SyntacticTree"/> which represents the query specified in the <paramref name="queryUri"/>.</returns>
public static SyntacticTree ParseUri(Uri queryUri, Uri serviceBaseUri, int maxDepth)
{
ExceptionUtils.CheckArgumentNotNull(queryUri, "queryUri");
if (!queryUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(queryUri), "queryUri");
}
ExceptionUtils.CheckArgumentNotNull(serviceBaseUri, "serviceBaseUri");
if (!serviceBaseUri.IsAbsoluteUri)
{
throw new ArgumentException(Strings.SyntacticTree_UriMustBeAbsolute(serviceBaseUri), "serviceBaseUri");
}
if (maxDepth <= 0)
{
throw new ArgumentException(Strings.SyntacticTree_MaxDepthInvalid, "maxDepth");
}
UriPathParser pathParser = new UriPathParser(maxDepth);
var path = pathParser.ParsePathIntoSegments(queryUri, serviceBaseUri);
List <CustomQueryOptionToken> queryOptions = UriUtils.ParseQueryOptions(queryUri);
QueryToken filter = null;
string filterQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FilterQueryOption);
if (filterQuery != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
filter = expressionParser.ParseFilter(filterQuery);
}
IEnumerable <OrderByToken> orderByTokens = null;
string orderByQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.OrderByQueryOption);
if (orderByQuery != null)
{
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(maxDepth);
orderByTokens = expressionParser.ParseOrderBy(orderByQuery);
}
SelectToken select = null;
string selectQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SelectQueryOption);
if (selectQuery != null)
{
ISelectExpandTermParser selectParser = SelectExpandTermParserFactory.Create(selectQuery);
select = selectParser.ParseSelect();
}
ExpandToken expand = null;
string expandQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.ExpandQueryOption);
if (expandQuery != null)
{
ISelectExpandTermParser expandParser = SelectExpandTermParserFactory.Create(expandQuery);
expand = expandParser.ParseExpand();
}
int? skip = null;
string skipQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.SkipQueryOption);
if (skipQuery != null)
{
int skipValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(skipQuery, out skipValue))
{
throw new ODataException(Strings.SyntacticTree_InvalidSkipQueryOptionValue(skipQuery));
}
skip = skipValue;
}
int? top = null;
string topQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.TopQueryOption);
if (topQuery != null)
{
int topValue;
if (!UriPrimitiveTypeParser.TryUriStringToNonNegativeInteger(topQuery, out topValue))
{
throw new ODataException(Strings.SyntacticTree_InvalidTopQueryOptionValue(topQuery));
}
top = topValue;
}
string inlineCountQuery = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.InlineCountQueryOption);
InlineCountKind?inlineCount = QueryTokenUtils.ParseInlineCountKind(inlineCountQuery);
string format = queryOptions.GetQueryOptionValueAndRemove(UriQueryConstants.FormatQueryOption);
return(new SyntacticTree(
path,
filter,
orderByTokens,
select,
expand,
skip,
top,
inlineCount,
format,
queryOptions.Count == 0 ? null : new ReadOnlyCollection <CustomQueryOptionToken>(queryOptions)));
}
/// <summary>
/// Tries to remove formatting specific to this parser's expected type.
/// </summary>
/// <param name="text">The text to remove formatting from.</param>
/// <returns>
/// Whether or not the expected formatting was found and succesfully removed.
/// </returns>
internal override bool TryRemoveFormatting(ref string text)
{
DebugUtils.CheckNoExternalCallers();
return(UriPrimitiveTypeParser.TryRemoveQuotes(ref text));
}
/// <summary>Returns the 4 bits that correspond to the specified character.</summary>
/// <param name="c">Character in the 0-F range to be converted.</param>
/// <returns>The 4 bits that correspond to the specified character.</returns>
/// <exception cref="FormatException">Thrown when 'c' is not in the '0'-'9','a'-'f' range.</exception>
private static byte HexCharToNibble(char c)
{
Debug.Assert(UriPrimitiveTypeParser.IsCharHexDigit(c), String.Format(CultureInfo.InvariantCulture, "{0} is not a hex digit.", c));
switch (c)
{
case '0':
return(0);
case '1':
return(1);
case '2':
return(2);
case '3':
return(3);
case '4':
return(4);
case '5':
return(5);
case '6':
return(6);
case '7':
return(7);
case '8':
return(8);
case '9':
return(9);
case 'a':
case 'A':
return(10);
case 'b':
case 'B':
return(11);
case 'c':
case 'C':
return(12);
case 'd':
case 'D':
return(13);
case 'e':
case 'E':
return(14);
case 'f':
case 'F':
return(15);
default:
throw new InvalidOperationException();
}
}
private ExpressionTokenKind ParseFromDigit()
{
ExpressionTokenKind integerLiteral;
char ch = this.ch;
this.NextChar();
if (((ch == '0') && (this.ch == 'x')) || (this.ch == 'X'))
{
integerLiteral = ExpressionTokenKind.BinaryLiteral;
do
{
this.NextChar();
}while (UriPrimitiveTypeParser.IsCharHexDigit(this.ch));
return(integerLiteral);
}
integerLiteral = ExpressionTokenKind.IntegerLiteral;
while (char.IsDigit(this.ch))
{
this.NextChar();
}
if (this.ch == '.')
{
integerLiteral = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
this.ValidateDigit();
do
{
this.NextChar();
}while (char.IsDigit(this.ch));
}
if ((this.ch == 'E') || (this.ch == 'e'))
{
integerLiteral = 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'))
{
integerLiteral = ExpressionTokenKind.DecimalLiteral;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'd') || (this.ch == 'D'))
{
integerLiteral = ExpressionTokenKind.DoubleLiteral;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'L') || (this.ch == 'l'))
{
integerLiteral = ExpressionTokenKind.Int64Literal;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'f') || (this.ch == 'F'))
{
integerLiteral = ExpressionTokenKind.SingleLiteral;
this.NextChar();
}
return(integerLiteral);
}
