envpath 0.0.1

A library for parsing and deserialising paths with special rules. The format is similar to `["$proj(com.xy.z): data ? cfg", "$const: os", "$val: rand-16"]`
Documentation 
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use std::ops::ControlFlow;

use crate::{EnvPath, OsCow};

impl EnvPath<'_> {
  /// This function is used to resolve ident in `$val: ident`.
  /// Unlike `$const:`, most of the values here are obtained at runtime.
  pub(crate) fn match_values(ident: &str) -> OsCow {
    match ident {
      "empty" => crate::os_cow::from_str(""),
      #[cfg(feature = "rand")]
      x if x.starts_with("rand-") => {
        let u = x
          .split_once('-')
          .map(|x| x.1)
          .and_then(|x| x.parse::<usize>().ok());
        crate::os_cow::into_os_cow(crate::random::get_random_value(u))
      }
      x if Self::starts_with_remix_expr(x) => Self::parse_remix_expr(x),
      _ => None,
    }
  }

  pub(crate) fn handle_values(ident: &str) -> OsCow {
    use ControlFlow::{Break, Continue};

    match Self::get_question_mark_separator(ident) {
      ' ' => Self::match_values(ident),
      sep => match Self::parse_dir_rules(ident, Self::match_values, sep) {
        Break(x) | Continue(x) => x,
      },
    }
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  #[test]
  #[cfg(feature = "consts")]
  fn test_value() {
    let v = EnvPath::from(["$val: empty ??  rand-2"]);
    dbg!(v.de().display());

    let p = EnvPath::new(["$const: empty ?? val * rand-33"]);
    dbg!(p.display());
  }
}