protected override Expression VisitParameter(ParameterExpression node)
{
var chain = new CallChain(this.context.GetChainPrefixFrom(node).ToList(), node, true);
if (chain.Links.Any())
{
this.context.SelectionChains.Add(chain);
}
return(base.VisitParameter(node));
}
public IEnumerable<CallChain> Expand(CallChain chainPrefix, Type type, Stack<string> visitedTypes)
{
if (typeof(IEnumerable).IsAssignableFrom(type) && type.IsGenericType)
{
var memberType = type.GetGenericArguments().Single();
return Expand(chainPrefix, memberType, visitedTypes);
}
var result = new List<CallChain>();
var graphQLTypeAttribute = type.GetCustomAttribute<GraphQLTypeAttribute>();
if (graphQLTypeAttribute == null) return result;
visitedTypes.Push(graphQLTypeAttribute.Name);
foreach (var field in type.GetProperties())
{
var fieldAttribute = field.GetCustomAttribute<GraphQLFieldAttribute>();
if (fieldAttribute == null) continue;
var copyOfLinks = chainPrefix.Links.ToList();
copyOfLinks.Add(new ChainLink(fieldAttribute.Name, false));
var chain = new CallChain(copyOfLinks, null, true);
var graphQLTypeAttributeOnField = typeof(IEnumerable).IsAssignableFrom(field.PropertyType) && field.PropertyType.IsGenericType
? field.PropertyType.GetGenericArguments().Single().GetCustomAttribute<GraphQLTypeAttribute>()
: field.PropertyType.GetCustomAttribute<GraphQLTypeAttribute>();
if (!visitedTypes.Contains(graphQLTypeAttributeOnField?.Name))
{
if (!field.PropertyType.IsEnum && graphQLTypeAttributeOnField != null)
{
result.AddRange(Expand(chain, field.PropertyType, visitedTypes));
}
else
{
result.Add(chain);
}
}
}
visitedTypes.Pop();
return result;
}