public override async Task <Document> LoadDocumentAsync(DocumentSettings settings, DocumentInfo?sourceInfo, string specifier, DocumentCategory category, DocumentContextCallback contextCallback)
{
MiscHelpers.VerifyNonNullArgument(settings, "settings");
MiscHelpers.VerifyNonBlankArgument(specifier, "specifier", "Invalid document specifier");
if ((settings.AccessFlags & DocumentAccessFlags.EnableAllLoading) == DocumentAccessFlags.None)
{
throw new UnauthorizedAccessException("This script engine is not configured for loading documents");
}
if (category == null)
{
category = sourceInfo.HasValue ? sourceInfo.Value.Category : DocumentCategory.Script;
}
List <Uri> candidateUris;
Uri uri;
if (Uri.TryCreate(specifier, UriKind.RelativeOrAbsolute, out uri) && uri.IsAbsoluteUri)
{
candidateUris = await GetCandidateUrisAsync(settings, sourceInfo, uri).ConfigureAwait(false);
}
else
{
candidateUris = await GetCandidateUrisAsync(settings, sourceInfo, specifier).ConfigureAwait(false);
}
if (candidateUris.Count < 1)
{
throw new FileNotFoundException(null, specifier);
}
if (candidateUris.Count == 1)
{
return(await LoadDocumentAsync(settings, candidateUris[0], category, contextCallback).ConfigureAwait(false));
}
var exceptions = new List <Exception>(candidateUris.Count);
foreach (var candidateUri in candidateUris)
{
var task = LoadDocumentAsync(settings, candidateUri, category, contextCallback);
try
{
return(await task.ConfigureAwait(false));
}
catch (Exception exception)
{
if ((task.Exception != null) && task.Exception.InnerExceptions.Count == 1)
{
Debug.Assert(ReferenceEquals(task.Exception.InnerExceptions[0], exception));
exceptions.Add(exception);
}
else
{
exceptions.Add(task.Exception);
}
}
}
if (exceptions.Count < 1)
{
MiscHelpers.AssertUnreachable();
throw new FileNotFoundException(null, specifier);
}
if (exceptions.Count == 1)
{
MiscHelpers.AssertUnreachable();
throw new FileLoadException(exceptions[0].Message, specifier, exceptions[0]);
}
throw new AggregateException(exceptions).Flatten();
}
