public VfsPathParserContext(PathParser parser, string[] pathElements, VfsEntity root)
{
this.Parser = parser;
foreach (string element in pathElements)
{
this.RemainingPathElements.Enqueue(element);
}
this.SpecifiedPath = this.Parser.BuildAbsolutePathStringFromElements(pathElements);
Exception = new VfsException(SpecifiedPath, "Unknown path parser error.");
AddToEntityStack(root);
}
public void AddToEntityStack(VfsEntity entity)
{
entity.AddHandleRef();
EntityStack.Add(entity);
NormalizedPathStack.Add(entity.Name);
}
public virtual async Task ParseAsync(VfsPathParserContext ctx, CancellationToken cancel = default)
{
if (ctx.RemainingPathElements.TryPeek(out string?nextName) == false)
{
// This is the final entity
ctx.Exception = null;
return;
}
nextName._MarkNotNull();
try
{
ResultOrExeption <ValueHolder <VfsEntity> > result = await this.OpenEntityAsync(nextName, cancel);
if (result.IsError && result.Exception is VfsNotFoundException)
{
ctx.Exception = new VfsNotFoundException(ctx.SpecifiedPath,
$"The object \"{nextName}\" is not found on the directory \"{this.FileSystem.PathParser.BuildAbsolutePathStringFromElements(ctx.NormalizedPathStack)}\".");
return;
}
using (var nextEntityHolder = result.Value)
{
ctx.RemainingPathElements.Dequeue();
VfsEntity nextEntity = nextEntityHolder.Value;
if (nextEntity is VfsDirectory nextDirectory)
{
ctx.AddToEntityStack(nextDirectory);
await nextDirectory.ParseAsync(ctx, cancel);
}
else if (nextEntity is VfsFile nextFile)
{
if (ctx.RemainingPathElements.Count >= 1)
{
throw new VfsNotFoundException(ctx.SpecifiedPath,
$"Invalid directory name. The file \"{nextName}\" is found on the directory \"{this.FileSystem.PathParser.BuildAbsolutePathStringFromElements(ctx.NormalizedPathStack)}\".");
}
ctx.AddToEntityStack(nextFile);
ctx.Exception = null;
return;
}
else
{
throw new VfsException(ctx.SpecifiedPath,
$"The object \"{nextName}\" is unknown type \"{nextEntity.GetType().ToString()}\".");
}
}
}
catch (VfsNotFoundException)
{
ctx.Exception = new VfsNotFoundException(ctx.SpecifiedPath,
$"The object \"{nextName}\" is not found on the directory \"{this.FileSystem.PathParser.BuildAbsolutePathStringFromElements(ctx.NormalizedPathStack)}\".");
return;
}
}