private IEnumerable <DirectoryInfo> JobsMatchingSegment(List <DirectoryInfo> nextSegmentRoots, DirectoryInfo directoryInfo, Segment segment)
{
switch (segment)
{
case DirectorySegment directorySegment:
// consume DirectorySegment
var pathJobs = (from directory in _options.GetDirectories(directoryInfo)
where directorySegment.MatchesSegment(directory.Name, _options.CaseSensitive)
select directory).ToArray();
nextSegmentRoots.AddRange(pathJobs);
return(_emptyPathJobArray);
case DirectoryWildcard _:
{
// match zero path segments, consuming DirectoryWildcard
nextSegmentRoots.Add(directoryInfo);
// match consume 1 path segment but not the Wildcard
return(_options.GetDirectories(directoryInfo));
}
default:
return(_emptyPathJobArray);
}
}
internal static IEnumerable <FileSystemInfo> Traverse(DirectoryInfo root, Segment[] segments, int segmentIndex,
TraverseOptions options)
{
if (segmentIndex == segments.Length)
{
return(options.EmitDirectories
? Enumerable.Repeat <FileSystemInfo>(root, 1)
: emptyFileSystemInfoArray);
}
var segment = segments[segmentIndex];
switch (segment)
{
case DirectorySegment directorySegment:
{
var filesToEmit =
(options.EmitFiles && segmentIndex == segments.Length - 1)
? options.GetFiles(root).Where(file => directorySegment.MatchesSegment(file.Name, options.CaseSensitive)).Cast <FileSystemInfo>()
: emptyFileSystemInfoArray;
var dirSegmentItems = from directory in options.GetDirectories(root)
where directorySegment.MatchesSegment(directory.Name, options.CaseSensitive)
from item in Traverse(directory, segments, segmentIndex + 1, options)
select item;
return(filesToEmit.Concat(dirSegmentItems));
}
case DirectoryWildcard _:
{
var filesToEmit =
(options.EmitFiles && segmentIndex == segments.Length - 1)
? options.GetFiles(root).Cast <FileSystemInfo>()
: emptyFileSystemInfoArray;
// match zero path segments, consuming DirectoryWildcard
var zeroMatch = Traverse(root, segments, segmentIndex + 1, options);
// match consume 1 path segment but not the Wildcard
var files = from directory in options.GetDirectories(root)
from item in Traverse(directory, segments, segmentIndex, options)
select item;
return(filesToEmit.Concat(zeroMatch).Concat(files));
}
default:
return(emptyFileSystemInfoArray);
}
}