private IDescriptor FindDescriptorForPath(IList <int> path)
{
// All complete declarations have an even, non-empty path length
// (There can be an empty path for a descriptor declaration, but that can't have any comments,
// so we currently ignore it.)
if (path.Count == 0 || (path.Count & 1) != 0)
{
return(null);
}
IReadOnlyList <DescriptorBase> topLevelList = GetNestedDescriptorListForField(path[0]);
DescriptorBase current = GetDescriptorFromList(topLevelList, path[1]);
for (int i = 2; current != null && i < path.Count; i += 2)
{
var list = current.GetNestedDescriptorListForField(path[i]);
current = GetDescriptorFromList(list, path[i + 1]);
}
return(current);
}
private Dictionary <IDescriptor, DescriptorDeclaration> CreateDeclarationMap()
{
var dictionary = new Dictionary <IDescriptor, DescriptorDeclaration>();
foreach (var location in Proto.SourceCodeInfo?.Location ?? Enumerable.Empty <Location>())
{
var descriptor = FindDescriptorForPath(location.Path);
if (descriptor != null)
{
dictionary[descriptor] = DescriptorDeclaration.FromProto(descriptor, location);
}
}
return(dictionary);
IDescriptor FindDescriptorForPath(IList <int> path)
{
// All complete declarations have an even, non-empty path length
// (There can be an empty path for a descriptor declaration, but that can't have any comments,
// so we currently ignore it.)
if (path.Count == 0 || (path.Count & 1) != 0)
{
return(null);
}
IReadOnlyList <DescriptorBase> topLevelList = GetNestedDescriptorListForField(path[0]);
DescriptorBase current = GetDescriptorFromList(topLevelList, path[1]);
for (int i = 2; current != null && i < path.Count; i += 2)
{
var list = current.GetNestedDescriptorListForField(path[i]);
current = GetDescriptorFromList(list, path[i + 1]);
}
return(current);
}
DescriptorBase GetDescriptorFromList(IReadOnlyList <DescriptorBase> list, int index)
{
// This is fine: it may be a newer version of protobuf than we understand, with a new descriptor
// field.
if (list == null)
{
return(null);
}
// We *could* return null to silently continue, but this is basically data corruption.
if (index < 0 || index >= list.Count)
{
// We don't have much extra information to give at this point unfortunately. If this becomes a problem,
// we can pass in the complete path and report that and the file name.
throw new InvalidProtocolBufferException($"Invalid descriptor location path: index out of range");
}
return(list[index]);
}
IReadOnlyList <DescriptorBase> GetNestedDescriptorListForField(int fieldNumber)
{
switch (fieldNumber)
{
case FileDescriptorProto.ServiceFieldNumber:
return((IReadOnlyList <DescriptorBase>)Services);
case FileDescriptorProto.MessageTypeFieldNumber:
return((IReadOnlyList <DescriptorBase>)MessageTypes);
case FileDescriptorProto.EnumTypeFieldNumber:
return((IReadOnlyList <DescriptorBase>)EnumTypes);
default:
return(null);
}
}
}