Path Dedot

This is a library for extending Path and PathBuf in order to parse the path which contains dots.

Please read the following examples to know the parsing rules.

Examples

If a path starts with a single dot, the dot means current working directory.

extern crate path_dedot;

use std::path::Path;
use std::env;

use path_dedot::*;

let p = Path::new("./path/to/123/456");

assert_eq!(Path::join(env::current_dir().unwrap().as_path(), Path::new("path/to/123/456")).to_str().unwrap(), p.parse_dot().unwrap().to_str().unwrap());

If a path starts with a pair of dots, the dots means the parent of current working directory. If current working directory is root, the parent is still root.

extern crate path_dedot;

use std::path::Path;
use std::env;

use path_dedot::*;

let p = Path::new("../path/to/123/456");

let cwd = env::current_dir().unwrap();

let cwd_parent = cwd.parent();

match cwd_parent {
   Some(cwd_parent) => {
      assert_eq!(Path::join(&cwd_parent, Path::new("path/to/123/456")).to_str().unwrap(), p.parse_dot().unwrap().to_str().unwrap());
   }
   None => {
      assert_eq!(Path::join(Path::new("/"), Path::new("path/to/123/456")).to_str().unwrap(), p.parse_dot().unwrap().to_str().unwrap());
   }
}

Besides starting with, the Single Dot and Double Dots can also be placed to other positions. Single Dot means noting and will be ignored. Double Dots means the parent.

extern crate path_dedot;

use std::path::Path;

use path_dedot::*;

let p = Path::new("/path/to/../123/456/./777");

assert_eq!("/path/123/456/777", p.parse_dot().unwrap().to_str().unwrap());

extern crate path_dedot;

use std::path::Path;

use path_dedot::*;

let p = Path::new("/path/to/../123/456/./777/..");

assert_eq!("/path/123/456", p.parse_dot().unwrap().to_str().unwrap());

You should notice that parse_dot method does not aim to get an absolute path. A path which does not start with a MAIN_SEPARATOR, Single Dot and Double Dots, will not have each of them after the parse_dot method is used.

extern crate path_dedot;

use std::path::Path;

use path_dedot::*;

let p = Path::new("path/to/../123/456/./777/..");

assert_eq!("path/123/456", p.parse_dot().unwrap().to_str().unwrap());

Double Dots which is not placed at the start cannot get the parent beyond the original path. Why not? With this constraint, you can insert an absolute path to the start as a virtual root in order to protect your file system from being exposed.

extern crate path_dedot;

use std::path::Path;

use path_dedot::*;

let p = Path::new("path/to/../../../../123/456/./777/..");

assert_eq!("123/456", p.parse_dot().unwrap().to_str().unwrap());

extern crate path_dedot;

use std::path::Path;

use path_dedot::*;

let p = Path::new("/path/to/../../../../123/456/./777/..");

assert_eq!("/123/456", p.parse_dot().unwrap().to_str().unwrap());

Crates.io

https://crates.io/crates/path-dedot

Documentation

https://docs.rs/path-dedot

License

MIT