protected override Expression VisitMember(MemberExpression node)
{
if (!(node.Member is PropertyInfo))
{
return(base.VisitMember(node));
}
var attr = ((PropertyInfo)node.Member).GetCustomAttribute <Attributes.ExpressionExpandablePropertyAttribute>(inherit: false);
if (attr == null)
{
return(base.VisitMember(node));
}
// Visit subtrees first
node = Expression.MakeMemberAccess(
expression: Visit(node.Expression),
member: node.Member);
Expression customExpanded;
try {
// Expand node itself
customExpanded = attr.CustomExpander.Expand(node, evaluator);
} catch (Exception e) {
return(ExceptionClosure.MakeExceptionClosureCall(
CustomExpanderException.Create(
expander: attr.CustomExpander,
expression: node,
exception: e),
node.Type));
}
//Visit result
return(Visit(customExpanded));
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var attr = node.Method.GetCustomAttribute <Attributes.ExpressionExpandableMethodAttribute>(inherit: false);
if (attr == null)
{
return(base.VisitMethodCall(node));
}
// Visit subtrees first
node = Expression.Call(
instance: Visit(node.Object),
method: node.Method,
arguments: node.Arguments.Select(Visit));
Expression customExpanded;
try {
// Expand node itself
customExpanded = attr.CustomExpander.Expand(node, evaluator);
} catch (Exception e) {
return(ExceptionClosure.MakeExceptionClosureCall(
CustomExpanderException.Create(
expander: attr.CustomExpander,
expression: node,
exception: e),
node.Type));
}
// Visit result
return(Visit(customExpanded));
}