public GroupByToken(IEnumerable <EndPathToken> properties, ApplyTransformationToken child)
{
ExceptionUtils.CheckArgumentNotNull(properties, "properties");
this.properties = properties;
this.child = child;
}
// parses $apply groupby tranformation (.e.g. groupby(ProductID, CategoryId, aggregate(UnitPrice with sum as TotalUnitPrice))
internal GroupByToken ParseGroupBy()
{
Debug.Assert(TokenIdentifierIs(ExpressionConstants.KeywordGroupBy), "token identifier is groupby");
lexer.NextToken();
// '('
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.OpenParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_OpenParenExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
this.lexer.NextToken();
// '('
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.OpenParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_OpenParenExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
this.lexer.NextToken();
// properties
var properties = new List <EndPathToken>();
while (true)
{
var expression = this.ParsePrimary() as EndPathToken;
if (expression == null)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_ExpressionExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
properties.Add(expression);
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
// ")"
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.CloseParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_CloseParenOrOperatorExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
this.lexer.NextToken();
// optional child transformation
ApplyTransformationToken transformationToken = null;
// "," (comma)
if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.Comma)
{
this.lexer.NextToken();
if (TokenIdentifierIs(ExpressionConstants.KeywordAggregate))
{
transformationToken = this.ParseAggregate();
}
else
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_KeywordOrIdentifierExpected(ExpressionConstants.KeywordAggregate, this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
}
// ")"
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.CloseParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_CloseParenOrCommaExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
this.lexer.NextToken();
return(new GroupByToken(properties, transformationToken));
}
