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|
//! Thin wrappers around `std::path`, distinguishing between absolute and
//! relative paths.
use std::{
convert::{TryFrom, TryInto},
ops,
path::{Component, Path, PathBuf},
};
#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub struct AbsPathBuf(PathBuf);
impl From<AbsPathBuf> for PathBuf {
fn from(AbsPathBuf(path_buf): AbsPathBuf) -> PathBuf {
path_buf
}
}
impl ops::Deref for AbsPathBuf {
type Target = AbsPath;
fn deref(&self) -> &AbsPath {
self.as_path()
}
}
impl AsRef<Path> for AbsPathBuf {
fn as_ref(&self) -> &Path {
self.0.as_path()
}
}
impl TryFrom<PathBuf> for AbsPathBuf {
type Error = PathBuf;
fn try_from(path_buf: PathBuf) -> Result<AbsPathBuf, PathBuf> {
if !path_buf.is_absolute() {
return Err(path_buf);
}
Ok(AbsPathBuf(path_buf))
}
}
impl TryFrom<&str> for AbsPathBuf {
type Error = PathBuf;
fn try_from(path: &str) -> Result<AbsPathBuf, PathBuf> {
AbsPathBuf::try_from(PathBuf::from(path))
}
}
impl AbsPathBuf {
pub fn as_path(&self) -> &AbsPath {
AbsPath::new_unchecked(self.0.as_path())
}
pub fn pop(&mut self) -> bool {
self.0.pop()
}
}
#[derive(Debug, Ord, PartialOrd, Eq, PartialEq, Hash)]
#[repr(transparent)]
pub struct AbsPath(Path);
impl ops::Deref for AbsPath {
type Target = Path;
fn deref(&self) -> &Path {
&self.0
}
}
impl AsRef<Path> for AbsPath {
fn as_ref(&self) -> &Path {
&self.0
}
}
impl<'a> TryFrom<&'a Path> for &'a AbsPath {
type Error = &'a Path;
fn try_from(path: &'a Path) -> Result<&'a AbsPath, &'a Path> {
if !path.is_absolute() {
return Err(path);
}
Ok(AbsPath::new_unchecked(path))
}
}
impl AbsPath {
fn new_unchecked(path: &Path) -> &AbsPath {
unsafe { &*(path as *const Path as *const AbsPath) }
}
pub fn join(&self, path: impl AsRef<Path>) -> AbsPathBuf {
self.as_ref().join(path).try_into().unwrap()
}
pub fn normalize(&self) -> AbsPathBuf {
AbsPathBuf(normalize_path(&self.0))
}
}
// https://github.com/rust-lang/cargo/blob/79c769c3d7b4c2cf6a93781575b7f592ef974255/src/cargo/util/paths.rs#L60-L85
fn normalize_path(path: &Path) -> PathBuf {
let mut components = path.components().peekable();
let mut ret = if let Some(c @ Component::Prefix(..)) = components.peek().cloned() {
components.next();
PathBuf::from(c.as_os_str())
} else {
PathBuf::new()
};
for component in components {
match component {
Component::Prefix(..) => unreachable!(),
Component::RootDir => {
ret.push(component.as_os_str());
}
Component::CurDir => {}
Component::ParentDir => {
ret.pop();
}
Component::Normal(c) => {
ret.push(c);
}
}
}
ret
}
|
