internal static gsColumnParserBase CreateParser(SelectElement selectElement)
{
if (selectElement is SelectStarExpression)
{
return(new gsColumnParserSelectStar(selectElement));
}
else if (selectElement is SelectScalarExpression)
{
return(new gsColumnParserSelectScalar(selectElement));
}
else
{
throw new NotImplementedException($"Select of type {selectElement.GetType().Name} not supported");
}
}
private WSelectElement ParseSelectElement(SelectElement sel)
{
if (sel == null)
{
return null;
}
switch (sel.GetType().Name)
{
case "SelectScalarExpression":
{
var sse = sel as SelectScalarExpression;
var pScalarExpr = new WSelectScalarExpression
{
SelectExpr = ParseScalarExpression(sse.Expression),
FirstTokenIndex = sse.FirstTokenIndex,
LastTokenIndex = sse.LastTokenIndex
};
if (sse.ColumnName != null)
{
pScalarExpr.ColumnName = sse.ColumnName.Value;
}
return pScalarExpr;
}
case "SelectStarExpression":
{
var sse = sel as SelectStarExpression;
return new WSelectStarExpression()
{
FirstTokenIndex = sse.FirstTokenIndex,
LastTokenIndex = sse.LastTokenIndex,
Qulifier = ParseMultiPartIdentifier(sse.Qualifier)
};
}
case "SelectSetVariable":
{
var ssv = sel as SelectSetVariable;
return new WSelectSetVariable
{
VariableName = ssv.Variable.Name,
Expression = ParseScalarExpression(ssv.Expression),
AssignmentType = ssv.AssignmentKind,
FirstTokenIndex = ssv.FirstTokenIndex,
LastTokenIndex = ssv.LastTokenIndex
};
}
default:
{
return null;
}
}
}