BadVirtualPathReader.cs

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using BadScript2.Utility;
 
namespace BadScript2.IO.Virtual;
 
public static class BadVirtualPathReader
{
    public static string JoinPath(IEnumerable<string> parts)
    {
        return '/' + string.Join("/", parts);
    }
 
    public static bool IsDirectory(string path)
    {
        return path.EndsWith('/') || path.EndsWith('\\');
    }
 
    public static string[] SplitPath(string path)
    {
        string[] parts = path.Split('/', '\\');
 
        if (IsAbsolutePath(path))
        {
            parts = parts.Skip(1)
                         .ToArray();
        }
 
        return parts;
    }
 
    public static bool IsAbsolutePath(string path)
    {
        return path.StartsWith('/') || path.StartsWith('\\');
    }
 
    public static bool IsRootPath(string path)
    {
        return path is "/" or "\\";
    }
 
    public static string ResolvePath(string path, string currentDir)
    {
        string[] parts = SplitPath(path);
 
        if (parts.Length == 0)
        {
            return currentDir;
        }
 
        List<string> result;
 
        if (IsAbsolutePath(path) || currentDir == "/" || currentDir == "\\")
        {
            result = new List<string>();
        }
        else
        {
            result = new List<string>(currentDir.Split('/', '\\')
                                                .Skip(1)
                                     );
        }
 
        foreach (string t in parts)
        {
            switch (t)
            {
                case ".":
                    continue;
                case ".." when result.Count == 0:
                    throw new Exception("Can't go back from root");
                case "..":
                    result.RemoveAt(result.Count - 1);
 
                    break;
                default:
                    result.Add(t);
 
                    break;
            }
        }
 
        if (result.Count != 0 && string.IsNullOrEmpty(result[result.Count - 1]))
        {
            result.RemoveAt(result.Count - 1);
        }
 
        return "/" + string.Join("/", result);
    }
}