private static Expression?CustomResolverFn(Expression source, IMemberModel destinationMember, CompileArgument arg)
{
var config = arg.Settings;
var resolvers = config.Resolvers;
if (resolvers == null || resolvers.Count <= 0)
{
return(null);
}
var invokes = new List <Tuple <Expression, Expression> >();
Expression?getter = null;
foreach (var resolver in resolvers)
{
if (!destinationMember.Name.Equals(resolver.DestinationMemberName))
{
continue;
}
var invoke = resolver.Invoker == null
? ExpressionEx.PropertyOrField(source, resolver.SourceMemberName)
: resolver.IsChildPath
? resolver.Invoker.Body
: resolver.Invoker.Apply(arg.MapType, source);
if (resolver.Condition == null)
{
getter = invoke;
break;
}
var condition = resolver.IsChildPath
? resolver.Condition.Body
: resolver.Condition.Apply(arg.MapType, source);
invokes.Add(Tuple.Create(condition, invoke));
}
if (invokes.Count > 0)
{
invokes.Reverse();
if (getter == null)
{
var type = invokes[0].Item2.Type;
getter = type.CreateDefault();
}
foreach (var invoke in invokes)
{
getter = Expression.Condition(invoke.Item1, invoke.Item2, getter);
}
}
return(getter);
}
public InvokerModel?Next(ParameterExpression source, string destMemberName)
{
if (!this.DestinationMemberName.StartsWith(destMemberName + "."))
{
return(null);
}
return(new InvokerModel
{
DestinationMemberName = this.DestinationMemberName.Substring(destMemberName.Length + 1),
Condition = this.IsChildPath || this.Condition == null
? this.Condition
: Expression.Lambda(this.Condition.Apply(source), source),
Invoker = this.IsChildPath
? this.Invoker
: Expression.Lambda(this.Invoker?.Apply(source) ?? ExpressionEx.PropertyOrField(source, this.SourceMemberName), source),
SourceMemberName = this.SourceMemberName,
IsChildPath = true,
});
}
