// parses $apply compute expression (.e.g. compute(UnitPrice mul SalesPrice as computePrice)
internal ComputeToken ParseCompute()
{
Debug.Assert(TokenIdentifierIs(ExpressionConstants.KeywordCompute), "token identifier is compute");
lexer.NextToken();
// '('
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.OpenParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_OpenParenExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
lexer.NextToken();
List <ComputeExpressionToken> transformationTokens = new List <ComputeExpressionToken>();
while (true)
{
ComputeExpressionToken computed = this.ParseComputeExpression();
transformationTokens.Add(computed);
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
// ")"
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.CloseParen)
{
throw ParseError(ODataErrorStrings.UriQueryExpressionParser_CloseParenOrCommaExpected(this.lexer.CurrentToken.Position, this.lexer.ExpressionText));
}
this.lexer.NextToken();
return(new ComputeToken(transformationTokens));
}
// parses $compute query option.
internal ComputeToken ParseCompute(string compute)
{
Debug.Assert(compute != null, "compute != null");
List <ComputeExpressionToken> transformationTokens = new List <ComputeExpressionToken>();
if (string.IsNullOrEmpty(compute))
{
return(new ComputeToken(transformationTokens));
}
this.recursionDepth = 0;
this.lexer = CreateLexerForFilterOrOrderByOrApplyExpression(compute);
while (true)
{
ComputeExpressionToken computed = this.ParseComputeExpression();
transformationTokens.Add(computed);
if (this.lexer.CurrentToken.Kind != ExpressionTokenKind.Comma)
{
break;
}
this.lexer.NextToken();
}
this.lexer.ValidateToken(ExpressionTokenKind.End);
return(new ComputeToken(transformationTokens));
}
private ComputeExpression BindComputeExpressionToken(ComputeExpressionToken token)
{
SingleValueNode node = this.bindMethod(token.Expression) as SingleValueNode;
ComputeExpression expression = new ComputeExpression(node, token.Alias, node.TypeReference);
return(expression);
}