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use std::path::{Component, Path, PathBuf};
pub trait Lexiclean {
fn lexiclean(self) -> PathBuf;
}
impl Lexiclean for &Path {
fn lexiclean(self) -> PathBuf {
if self.components().count() <= 1 {
return self.to_owned();
}
let mut components = Vec::new();
for component in self
.components()
.filter(|component| component != &Component::CurDir)
{
if component == Component::ParentDir {
match components.last() {
Some(Component::Normal(_)) => {
components.pop();
}
Some(Component::ParentDir) | None => components.push(component),
_ => {}
}
} else {
components.push(component);
}
}
components.into_iter().collect()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[rustfmt::skip]
fn simple() {
fn case(path: &str, want: &str) {
assert_eq!(Path::new(path).lexiclean(), Path::new(want));
}
case("", "");
case(".", ".");
case("..", "..");
case("../../../", "../../..");
case("./", ".");
case("./..", "..");
case("./../.", "..");
case("./././.", ".");
case("/." , "/");
case("/..", "/");
case("/../../../../../../../", "/");
case("/././", "/");
case("//foo/bar//baz", "/foo/bar/baz");
case("/foo", "/foo");
case("/foo/../bar", "/bar");
case("/foo/./bar/.", "/foo/bar");
case("/foo/bar/..", "/foo");
case("bar//baz", "bar/baz");
case("foo", "foo");
case("foo/./bar", "foo/bar");
}
}