dsntk-common 0.3.0

//! # Conversion utilities for namespaces

use url::Url;

/// Converts an URI into its RDNN-like equivalent.
///
/// Unless the input namespace URI is invalid or does not contain a domain name,
/// this function returns its RDNN-like equivalent. Domain name segments are reversed,
/// path segments order is preserved, all segments are joined with
/// the forward slash `/` character.
///
/// Returns `None` for namespace URIs that can not be converted to its RDNN-like equivalent.
///
/// # Examples
///
/// ```
/// use dsntk_common::to_rdnn;
///
/// let rdnn = to_rdnn("https://dsntk.io/system-1/component-1");
/// assert_eq!(Some("io/dsntk/system-1/component-1".to_string()), rdnn);
///
/// let rdnn = to_rdnn("https://dsntk.io");
/// assert_eq!(Some("io/dsntk".to_string()), rdnn);
///
/// let rdnn = to_rdnn("dsntk.io");
/// assert_eq!(None, rdnn);
///
/// ```
pub fn to_rdnn(input: &str) -> Option<String> {
  let Ok(url) = Url::parse(input) else {
    return None;
  };
  let segments = url.path_segments()?;
  let mut path_segments = segments.map(|s| s.trim()).filter(|s| !s.is_empty()).collect::<Vec<&str>>();
  let domain = url.domain()?;
  let mut domain_segments = domain.split('.').collect::<Vec<&str>>();
  domain_segments.reverse();
  domain_segments.append(&mut path_segments);
  Some(domain_segments.join("/"))
}