pnp 0.9.4

Resolution primitives for Yarn PnP
Documentation 
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use fancy_regex::Regex;
use serde::{de::Error, Deserialize, Deserializer};
use std::borrow::Cow;

use path_slash::PathBufExt;
use std::path::{PathBuf, Path};

#[derive(Debug, Default, Clone)]
pub struct Trie<T> {
    inner: radix_trie::Trie<String, (PathBuf, T)>,
}

impl<T> Trie<T> {
    fn key<P: AsRef<Path>>(&self, key: &P) -> String {
        let mut p = normalize_path(key.as_ref().to_string_lossy());

        if !p.ends_with('/') {
            p.push('/');
        }

        p
    }

    pub fn get_ancestor_value<P: AsRef<Path>>(&self, key: &P) -> Option<&T> {
        self.inner.get_ancestor_value(&self.key(&key)).map(|t| &t.1)
    }

    pub fn insert<P: AsRef<Path>>(&mut self, key: P, value: T) -> () {
        let k = self.key(&key);
        let p = PathBuf::from(k.clone());

        self.inner.insert(k, (p, value)).map(|t| t.1);
    }
}

pub fn normalize_path<P: AsRef<str>>(original: P) -> String {
    let original_str = original.as_ref();

    let p = PathBuf::from(original_str);
    let mut str = clean_path::clean(p)
        .to_slash_lossy()
        .to_string();

    if original_str.ends_with('/') && !str.ends_with('/') {
        str.push('/');
    }

    str
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_normalize_path() {
        assert_eq!(normalize_path(""), ".");
        assert_eq!(normalize_path("/"), "/");
        assert_eq!(normalize_path("foo"), "foo");
        assert_eq!(normalize_path("foo/bar"), "foo/bar");
        assert_eq!(normalize_path("foo//bar"), "foo/bar");
        assert_eq!(normalize_path("foo/./bar"), "foo/bar");
        assert_eq!(normalize_path("foo/../bar"), "bar");
        assert_eq!(normalize_path("foo/bar/.."), "foo");
        assert_eq!(normalize_path("foo/../../bar"), "../bar");
        assert_eq!(normalize_path("../foo/../../bar"), "../../bar");
        assert_eq!(normalize_path("./foo"), "foo");
        assert_eq!(normalize_path("../foo"), "../foo");
        assert_eq!(normalize_path("/foo/bar"), "/foo/bar");
        assert_eq!(normalize_path("/foo/bar/"), "/foo/bar/");
    }
}

fn strip_slash_escape(str: &str) -> String {
    let mut res = String::default();
    res.reserve_exact(str.len());

    let mut iter = str.chars().peekable();
    let mut escaped = false;

    while let Some(c) = iter.next() {
        if !escaped && c == '\\' {
            if iter.peek() == Some(&'/') {
                continue;
            }

            escaped = true;
        } else {
            escaped = false;
        }

        res.push(c);
    }

    res
}

#[derive(Clone, Debug)]
pub struct RegexDef(pub Regex);

impl<'de> Deserialize<'de> for RegexDef {
    fn deserialize<D>(d: D) -> Result<RegexDef, D::Error>
    where D: Deserializer<'de>,
    {
        let s = <Cow<str>>::deserialize(d)?;

        match strip_slash_escape(s.as_ref()).parse() {
            Ok(regex) => Ok(RegexDef(regex)),
            Err(err) => Err(D::Error::custom(err)),
        }
    }
}