static IEnumerable <string> _ParsePath(FilepathScanner aScan)
{
while (aScan.Skip(ITEM_PATTERN, out var match))
{
yield return(match.Groups[1].Value);
aScan.Skip(SEPARATING_PATTERN);
}
}
/// <summary>
/// Traditional DOS path
/// Parse(@"C:\dir\file.txt");
/// Parse(@"relative\dir\and\file.txt");
/// Parse(@"\"); // root
/// Parse(@"C:\"); // drive and root
/// Parse(@"C:"); // specifies a drive, but relative
/// Parse(@"D:drive-and-relative\dir\file");
///
/// DOS Device path
/// Parse(@"\\?\volume/dir/more-dir/.git");
///
/// UNC path
/// Parse(@"\\server\share-name\dir\file");
///
/// UNIX
/// Parse("/usr/local/bin");
/// Parse("/"); // root
/// </summary>
/// <param name="aInput"></param>
/// <returns></returns>
public static Filepath Parse(string?aInput)
{
if (string.IsNullOrEmpty(aInput))
{
return(Empty);
}
var scan = new FilepathScanner(aInput ?? "");
var self = new Filepath();
self.Prefix = _ParsePrefix(scan);
self.Absolute = scan.Skip(SEPARATING_PATTERN);
self.Items = _ParsePath(scan).ToArray();
return(self);
}
static IPathPrefix _ParsePrefix(FilepathScanner aScan)
{
if (PathPrefix.Dos.TryParse(aScan, out var traDos))
{
return(traDos !);
}
else if (PathPrefix.DosDevice.TryParse(aScan, out var pxDosDev))
{
return(pxDosDev !);
}
else if (PathPrefix.Unc.TryParse(aScan, out var justUnc))
{
return(justUnc !);
}
else
{
return(PathPrefix.Empty.STATIC);
}
}