/// <summary>
/// Analyses and transforms the supplied expression node
/// </summary>
/// <param name="node">Expression/node to be analysed</param>
/// <returns>The transformed expression</returns>
public override Expression Visit(Expression node)
{
var classifiedExpr = new ClassifiedExpression(node);
_currentNodePath.Insert(0, classifiedExpr);
try
{
// if we're under the main select, check with the analyser if the expression should be
// passed on; if so, no need to visit children, just replace with a parameter
if (this._currentNodePath.AncestorHasClassification <MainSelectCallClassification>())
{
if (ShouldProviderHandleExpression(_currentNodePath))
{
var sourceExpr = RegisterSourceExpression(0);
return(sourceExpr.ParameterReplacement);
}
}
// not a source experssion, keep processing..
var result = base.Visit(node);
return(result);
}
finally
{
_currentNodePath.RemoveAt(0);
}
}
public void Two_node_path_parents_are_correct()
{
var path = new ExpressionNodePath();
var rootExp = new ClassifiedExpression(null);
var childExp = new ClassifiedExpression(null);
path.Insert(0, rootExp);
Assert.AreEqual(null, path.Parent);
path.Insert(0, childExp);
Assert.AreEqual(rootExp, path.Parent);
}
