public void EmptySelectTermShouldThrow()
{
SelectExpandParser parser = new SelectExpandParser("one,,two", ODataUriParserSettings.DefaultSelectExpandLimit);
Action parse = () => parser.ParseSelect();
parse.ShouldThrow <ODataException>().WithMessage(ODataErrorStrings.ExpressionToken_IdentifierExpected("4"));
}
/// <summary>
/// Uses the ExpressionLexer to visit the next ExpressionToken, and delegates parsing of segments, type segments, identifiers,
/// and the star token to other methods.
/// </summary>
/// <param name="previousSegment">Previously parsed PathSegmentToken, or null if this is the first token.</param>
/// <returns>A parsed PathSegmentToken representing the next segment in this path.</returns>
private PathSegmentToken ParseSegment(PathSegmentToken previousSegment)
{
if (this.lexer.CurrentToken.Text.StartsWith("$", StringComparison.CurrentCulture))
{
throw new ODataException(ODataErrorStrings.UriSelectParser_SystemTokenInSelectExpand(this.lexer.CurrentToken.Text, this.lexer.ExpressionText));
}
string propertyName;
if (this.lexer.PeekNextToken().Kind == ExpressionTokenKind.Dot)
{
propertyName = this.lexer.ReadDottedIdentifier(this.isSelect);
}
else if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.Star)
{
if (this.lexer.PeekNextToken().Kind == ExpressionTokenKind.Slash)
{
throw new ODataException(ODataErrorStrings.ExpressionToken_IdentifierExpected(this.lexer.Position));
}
propertyName = this.lexer.CurrentToken.Text;
this.lexer.NextToken();
}
else
{
propertyName = this.lexer.CurrentToken.GetIdentifier();
this.lexer.NextToken();
}
return(new NonSystemToken(propertyName, null, previousSegment));
}
/// <summary>
/// Uses the ExpressionLexer to visit the next ExpressionToken, and delegates parsing of segments, type segments, identifiers,
/// and the star token to other methods.
/// </summary>
/// <param name="previousSegment">Previously parsed PathSegmentToken, or null if this is the first token.</param>
/// <param name="allowRef">Whether the $ref operation is valid in this token.</param>
/// <returns>A parsed PathSegmentToken representing the next segment in this path.</returns>
private PathSegmentToken ParseSegment(PathSegmentToken previousSegment, bool allowRef)
{
// TODO $count is defined in specification for expand, it is not supported now. Also note $count is not supported with star as expand option.
if (this.lexer.CurrentToken.Text.StartsWith("$", StringComparison.Ordinal) && (!allowRef || this.lexer.CurrentToken.Text != UriQueryConstants.RefSegment))
{
throw new ODataException(ODataErrorStrings.UriSelectParser_SystemTokenInSelectExpand(this.lexer.CurrentToken.Text, this.lexer.ExpressionText));
}
// Some check here to throw exception, both prop1/*/prop2 and */$ref/prop will throw exception, both are for $expand cases
if (!isSelect)
{
if (previousSegment != null && previousSegment.Identifier == UriQueryConstants.Star && this.lexer.CurrentToken.GetIdentifier() != UriQueryConstants.RefSegment)
{
// Star can only be followed with $ref
throw new ODataException(ODataErrorStrings.ExpressionToken_OnlyRefAllowWithStarInExpand);
}
else if (previousSegment != null && previousSegment.Identifier == UriQueryConstants.RefSegment)
{
// $ref should not have more property followed.
throw new ODataException(ODataErrorStrings.ExpressionToken_NoPropAllowedAfterRef);
}
}
string propertyName;
if (this.lexer.PeekNextToken().Kind == ExpressionTokenKind.Dot)
{
propertyName = this.lexer.ReadDottedIdentifier(this.isSelect);
}
else if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.Star)
{
// "*/$ref" is supported in expand
if (this.lexer.PeekNextToken().Kind == ExpressionTokenKind.Slash && isSelect)
{
throw new ODataException(ODataErrorStrings.ExpressionToken_IdentifierExpected(this.lexer.Position));
}
else if (previousSegment != null && !isSelect)
{
// expand option like "customer?$expand=VIPCUstomer/*" is not allowed as specification does not allowed any property before *.
throw new ODataException(ODataErrorStrings.ExpressionToken_NoSegmentAllowedBeforeStarInExpand);
}
propertyName = this.lexer.CurrentToken.Text;
this.lexer.NextToken();
}
else
{
propertyName = this.lexer.CurrentToken.GetIdentifier();
this.lexer.NextToken();
}
return(new NonSystemToken(propertyName, null, previousSegment));
}