public static IIncludeFileSystem GetIncludeFileSystem(this ITextBuffer textBuffer, VisualStudioSourceTextFactory sourceTextFactory)
{
return textBuffer.Properties.GetOrCreateSingletonProperty(IncludeFileSystemKey,
() => new VisualStudioFileSystem(textBuffer.GetTextContainer(), sourceTextFactory));
}
public VisualStudioFileSystem(VisualStudioSourceTextContainer textContainer, VisualStudioSourceTextFactory sourceTextFactory)
{
_sourceTextFactory = sourceTextFactory;
if (textContainer.Filename != null)
_parentDirectory = Path.GetDirectoryName(textContainer.Filename);
}