|
|
// hg_path.rs
|
|
|
//
|
|
|
// Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
|
|
|
//
|
|
|
// This software may be used and distributed according to the terms of the
|
|
|
// GNU General Public License version 2 or any later version.
|
|
|
|
|
|
use std::borrow::Borrow;
|
|
|
use std::ffi::{OsStr, OsString};
|
|
|
use std::fmt;
|
|
|
use std::ops::Deref;
|
|
|
use std::path::{Path, PathBuf};
|
|
|
|
|
|
#[derive(Debug, Eq, PartialEq)]
|
|
|
pub enum HgPathError {
|
|
|
/// Bytes from the invalid `HgPath`
|
|
|
LeadingSlash(Vec<u8>),
|
|
|
/// Bytes and index of the second slash
|
|
|
ConsecutiveSlashes(Vec<u8>, usize),
|
|
|
/// Bytes and index of the null byte
|
|
|
ContainsNullByte(Vec<u8>, usize),
|
|
|
/// Bytes
|
|
|
DecodeError(Vec<u8>),
|
|
|
}
|
|
|
|
|
|
impl ToString for HgPathError {
|
|
|
fn to_string(&self) -> String {
|
|
|
match self {
|
|
|
HgPathError::LeadingSlash(bytes) => {
|
|
|
format!("Invalid HgPath '{:?}': has a leading slash.", bytes)
|
|
|
}
|
|
|
HgPathError::ConsecutiveSlashes(bytes, pos) => format!(
|
|
|
"Invalid HgPath '{:?}': consecutive slahes at pos {}.",
|
|
|
bytes, pos
|
|
|
),
|
|
|
HgPathError::ContainsNullByte(bytes, pos) => format!(
|
|
|
"Invalid HgPath '{:?}': contains null byte at pos {}.",
|
|
|
bytes, pos
|
|
|
),
|
|
|
HgPathError::DecodeError(bytes) => {
|
|
|
format!("Invalid HgPath '{:?}': could not be decoded.", bytes)
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl From<HgPathError> for std::io::Error {
|
|
|
fn from(e: HgPathError) -> Self {
|
|
|
std::io::Error::new(std::io::ErrorKind::InvalidData, e.to_string())
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/// This is a repository-relative path (or canonical path):
|
|
|
/// - no null characters
|
|
|
/// - `/` separates directories
|
|
|
/// - no consecutive slashes
|
|
|
/// - no leading slash,
|
|
|
/// - no `.` nor `..` of special meaning
|
|
|
/// - stored in repository and shared across platforms
|
|
|
///
|
|
|
/// Note: there is no guarantee of any `HgPath` being well-formed at any point
|
|
|
/// in its lifetime for performance reasons and to ease ergonomics. It is
|
|
|
/// however checked using the `check_state` method before any file-system
|
|
|
/// operation.
|
|
|
///
|
|
|
/// This allows us to be encoding-transparent as much as possible, until really
|
|
|
/// needed; `HgPath` can be transformed into a platform-specific path (`OsStr`
|
|
|
/// or `Path`) whenever more complex operations are needed:
|
|
|
/// On Unix, it's just byte-to-byte conversion. On Windows, it has to be
|
|
|
/// decoded from MBCS to WTF-8. If WindowsUTF8Plan is implemented, the source
|
|
|
/// character encoding will be determined on a per-repository basis.
|
|
|
//
|
|
|
// FIXME: (adapted from a comment in the stdlib)
|
|
|
// `HgPath::new()` current implementation relies on `Slice` being
|
|
|
// layout-compatible with `[u8]`.
|
|
|
// When attribute privacy is implemented, `Slice` should be annotated as
|
|
|
// `#[repr(transparent)]`.
|
|
|
// Anyway, `Slice` representation and layout are considered implementation
|
|
|
// detail, are not documented and must not be relied upon.
|
|
|
#[derive(Eq, Ord, PartialEq, PartialOrd, Hash)]
|
|
|
pub struct HgPath {
|
|
|
inner: [u8],
|
|
|
}
|
|
|
|
|
|
impl HgPath {
|
|
|
pub fn new<S: AsRef<[u8]> + ?Sized>(s: &S) -> &Self {
|
|
|
unsafe { &*(s.as_ref() as *const [u8] as *const Self) }
|
|
|
}
|
|
|
pub fn is_empty(&self) -> bool {
|
|
|
self.inner.is_empty()
|
|
|
}
|
|
|
pub fn len(&self) -> usize {
|
|
|
self.inner.len()
|
|
|
}
|
|
|
fn to_hg_path_buf(&self) -> HgPathBuf {
|
|
|
HgPathBuf {
|
|
|
inner: self.inner.to_owned(),
|
|
|
}
|
|
|
}
|
|
|
pub fn bytes(&self) -> std::slice::Iter<u8> {
|
|
|
self.inner.iter()
|
|
|
}
|
|
|
pub fn to_ascii_uppercase(&self) -> HgPathBuf {
|
|
|
HgPathBuf::from(self.inner.to_ascii_uppercase())
|
|
|
}
|
|
|
pub fn to_ascii_lowercase(&self) -> HgPathBuf {
|
|
|
HgPathBuf::from(self.inner.to_ascii_lowercase())
|
|
|
}
|
|
|
pub fn as_bytes(&self) -> &[u8] {
|
|
|
&self.inner
|
|
|
}
|
|
|
pub fn contains(&self, other: u8) -> bool {
|
|
|
self.inner.contains(&other)
|
|
|
}
|
|
|
pub fn starts_with(&self, needle: impl AsRef<HgPath>) -> bool {
|
|
|
self.inner.starts_with(needle.as_ref().as_bytes())
|
|
|
}
|
|
|
pub fn join<T: ?Sized + AsRef<HgPath>>(&self, other: &T) -> HgPathBuf {
|
|
|
let mut inner = self.inner.to_owned();
|
|
|
if inner.len() != 0 && inner.last() != Some(&b'/') {
|
|
|
inner.push(b'/');
|
|
|
}
|
|
|
inner.extend(other.as_ref().bytes());
|
|
|
HgPathBuf::from_bytes(&inner)
|
|
|
}
|
|
|
/// Given a base directory, returns the slice of `self` relative to the
|
|
|
/// base directory. If `base` is not a directory (does not end with a
|
|
|
/// `b'/'`), returns `None`.
|
|
|
pub fn relative_to(&self, base: impl AsRef<HgPath>) -> Option<&HgPath> {
|
|
|
let base = base.as_ref();
|
|
|
if base.is_empty() {
|
|
|
return Some(self);
|
|
|
}
|
|
|
let is_dir = base.as_bytes().ends_with(b"/");
|
|
|
if is_dir && self.starts_with(base) {
|
|
|
Some(HgPath::new(&self.inner[base.len()..]))
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
/// Checks for errors in the path, short-circuiting at the first one.
|
|
|
/// This generates fine-grained errors useful for debugging.
|
|
|
/// To simply check if the path is valid during tests, use `is_valid`.
|
|
|
pub fn check_state(&self) -> Result<(), HgPathError> {
|
|
|
if self.len() == 0 {
|
|
|
return Ok(());
|
|
|
}
|
|
|
let bytes = self.as_bytes();
|
|
|
let mut previous_byte = None;
|
|
|
|
|
|
if bytes[0] == b'/' {
|
|
|
return Err(HgPathError::LeadingSlash(bytes.to_vec()));
|
|
|
}
|
|
|
for (index, byte) in bytes.iter().enumerate() {
|
|
|
match byte {
|
|
|
0 => {
|
|
|
return Err(HgPathError::ContainsNullByte(
|
|
|
bytes.to_vec(),
|
|
|
index,
|
|
|
))
|
|
|
}
|
|
|
b'/' => {
|
|
|
if previous_byte.is_some() && previous_byte == Some(b'/') {
|
|
|
return Err(HgPathError::ConsecutiveSlashes(
|
|
|
bytes.to_vec(),
|
|
|
index,
|
|
|
));
|
|
|
}
|
|
|
}
|
|
|
_ => (),
|
|
|
};
|
|
|
previous_byte = Some(*byte);
|
|
|
}
|
|
|
Ok(())
|
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
|
/// Only usable during tests to force developers to handle invalid states
|
|
|
fn is_valid(&self) -> bool {
|
|
|
self.check_state().is_ok()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl fmt::Debug for HgPath {
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
write!(f, "HgPath({:?})", String::from_utf8_lossy(&self.inner))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl fmt::Display for HgPath {
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
write!(f, "{}", String::from_utf8_lossy(&self.inner))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
#[derive(Eq, Ord, Clone, PartialEq, PartialOrd, Hash)]
|
|
|
pub struct HgPathBuf {
|
|
|
inner: Vec<u8>,
|
|
|
}
|
|
|
|
|
|
impl HgPathBuf {
|
|
|
pub fn new() -> Self {
|
|
|
Self { inner: Vec::new() }
|
|
|
}
|
|
|
pub fn push(&mut self, byte: u8) {
|
|
|
self.inner.push(byte);
|
|
|
}
|
|
|
pub fn from_bytes(s: &[u8]) -> HgPathBuf {
|
|
|
HgPath::new(s).to_owned()
|
|
|
}
|
|
|
pub fn into_vec(self) -> Vec<u8> {
|
|
|
self.inner
|
|
|
}
|
|
|
pub fn as_ref(&self) -> &[u8] {
|
|
|
self.inner.as_ref()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl fmt::Debug for HgPathBuf {
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
write!(f, "HgPathBuf({:?})", String::from_utf8_lossy(&self.inner))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl fmt::Display for HgPathBuf {
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
write!(f, "{}", String::from_utf8_lossy(&self.inner))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl Deref for HgPathBuf {
|
|
|
type Target = HgPath;
|
|
|
|
|
|
#[inline]
|
|
|
fn deref(&self) -> &HgPath {
|
|
|
&HgPath::new(&self.inner)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl From<Vec<u8>> for HgPathBuf {
|
|
|
fn from(vec: Vec<u8>) -> Self {
|
|
|
Self { inner: vec }
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: ?Sized + AsRef<HgPath>> From<&T> for HgPathBuf {
|
|
|
fn from(s: &T) -> HgPathBuf {
|
|
|
s.as_ref().to_owned()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl Into<Vec<u8>> for HgPathBuf {
|
|
|
fn into(self) -> Vec<u8> {
|
|
|
self.inner
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl Borrow<HgPath> for HgPathBuf {
|
|
|
fn borrow(&self) -> &HgPath {
|
|
|
&HgPath::new(self.as_bytes())
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl ToOwned for HgPath {
|
|
|
type Owned = HgPathBuf;
|
|
|
|
|
|
fn to_owned(&self) -> HgPathBuf {
|
|
|
self.to_hg_path_buf()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl AsRef<HgPath> for HgPath {
|
|
|
fn as_ref(&self) -> &HgPath {
|
|
|
self
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl AsRef<HgPath> for HgPathBuf {
|
|
|
fn as_ref(&self) -> &HgPath {
|
|
|
self
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl Extend<u8> for HgPathBuf {
|
|
|
fn extend<T: IntoIterator<Item = u8>>(&mut self, iter: T) {
|
|
|
self.inner.extend(iter);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/// TODO: Once https://www.mercurial-scm.org/wiki/WindowsUTF8Plan is
|
|
|
/// implemented, these conversion utils will have to work differently depending
|
|
|
/// on the repository encoding: either `UTF-8` or `MBCS`.
|
|
|
|
|
|
pub fn hg_path_to_os_string<P: AsRef<HgPath>>(
|
|
|
hg_path: P,
|
|
|
) -> Result<OsString, HgPathError> {
|
|
|
hg_path.as_ref().check_state()?;
|
|
|
let os_str;
|
|
|
#[cfg(unix)]
|
|
|
{
|
|
|
use std::os::unix::ffi::OsStrExt;
|
|
|
os_str = std::ffi::OsStr::from_bytes(&hg_path.as_ref().as_bytes());
|
|
|
}
|
|
|
// TODO Handle other platforms
|
|
|
// TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
|
|
|
Ok(os_str.to_os_string())
|
|
|
}
|
|
|
|
|
|
pub fn hg_path_to_path_buf<P: AsRef<HgPath>>(
|
|
|
hg_path: P,
|
|
|
) -> Result<PathBuf, HgPathError> {
|
|
|
Ok(Path::new(&hg_path_to_os_string(hg_path)?).to_path_buf())
|
|
|
}
|
|
|
|
|
|
pub fn os_string_to_hg_path_buf<S: AsRef<OsStr>>(
|
|
|
os_string: S,
|
|
|
) -> Result<HgPathBuf, HgPathError> {
|
|
|
let buf;
|
|
|
#[cfg(unix)]
|
|
|
{
|
|
|
use std::os::unix::ffi::OsStrExt;
|
|
|
buf = HgPathBuf::from_bytes(&os_string.as_ref().as_bytes());
|
|
|
}
|
|
|
// TODO Handle other platforms
|
|
|
// TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
|
|
|
|
|
|
buf.check_state()?;
|
|
|
Ok(buf)
|
|
|
}
|
|
|
|
|
|
pub fn path_to_hg_path_buf<P: AsRef<Path>>(
|
|
|
path: P,
|
|
|
) -> Result<HgPathBuf, HgPathError> {
|
|
|
let buf;
|
|
|
let os_str = path.as_ref().as_os_str();
|
|
|
#[cfg(unix)]
|
|
|
{
|
|
|
use std::os::unix::ffi::OsStrExt;
|
|
|
buf = HgPathBuf::from_bytes(&os_str.as_bytes());
|
|
|
}
|
|
|
// TODO Handle other platforms
|
|
|
// TODO: convert from WTF8 to Windows MBCS (ANSI encoding).
|
|
|
|
|
|
buf.check_state()?;
|
|
|
Ok(buf)
|
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
|
mod tests {
|
|
|
use super::*;
|
|
|
|
|
|
#[test]
|
|
|
fn test_path_states() {
|
|
|
assert_eq!(
|
|
|
Err(HgPathError::LeadingSlash(b"/".to_vec())),
|
|
|
HgPath::new(b"/").check_state()
|
|
|
);
|
|
|
assert_eq!(
|
|
|
Err(HgPathError::ConsecutiveSlashes(b"a/b//c".to_vec(), 4)),
|
|
|
HgPath::new(b"a/b//c").check_state()
|
|
|
);
|
|
|
assert_eq!(
|
|
|
Err(HgPathError::ContainsNullByte(b"a/b/\0c".to_vec(), 4)),
|
|
|
HgPath::new(b"a/b/\0c").check_state()
|
|
|
);
|
|
|
// TODO test HgPathError::DecodeError for the Windows implementation.
|
|
|
assert_eq!(true, HgPath::new(b"").is_valid());
|
|
|
assert_eq!(true, HgPath::new(b"a/b/c").is_valid());
|
|
|
// Backslashes in paths are not significant, but allowed
|
|
|
assert_eq!(true, HgPath::new(br"a\b/c").is_valid());
|
|
|
// Dots in paths are not significant, but allowed
|
|
|
assert_eq!(true, HgPath::new(b"a/b/../c/").is_valid());
|
|
|
assert_eq!(true, HgPath::new(b"./a/b/../c/").is_valid());
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_iter() {
|
|
|
let path = HgPath::new(b"a");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(Some(&b'a'), iter.next());
|
|
|
assert_eq!(None, iter.next_back());
|
|
|
assert_eq!(None, iter.next());
|
|
|
|
|
|
let path = HgPath::new(b"a");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(Some(&b'a'), iter.next_back());
|
|
|
assert_eq!(None, iter.next_back());
|
|
|
assert_eq!(None, iter.next());
|
|
|
|
|
|
let path = HgPath::new(b"abc");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(Some(&b'a'), iter.next());
|
|
|
assert_eq!(Some(&b'c'), iter.next_back());
|
|
|
assert_eq!(Some(&b'b'), iter.next_back());
|
|
|
assert_eq!(None, iter.next_back());
|
|
|
assert_eq!(None, iter.next());
|
|
|
|
|
|
let path = HgPath::new(b"abc");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(Some(&b'a'), iter.next());
|
|
|
assert_eq!(Some(&b'b'), iter.next());
|
|
|
assert_eq!(Some(&b'c'), iter.next());
|
|
|
assert_eq!(None, iter.next_back());
|
|
|
assert_eq!(None, iter.next());
|
|
|
|
|
|
let path = HgPath::new(b"abc");
|
|
|
let iter = path.bytes();
|
|
|
let mut vec = Vec::new();
|
|
|
vec.extend(iter);
|
|
|
assert_eq!(vec![b'a', b'b', b'c'], vec);
|
|
|
|
|
|
let path = HgPath::new(b"abc");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(Some(2), iter.rposition(|c| *c == b'c'));
|
|
|
|
|
|
let path = HgPath::new(b"abc");
|
|
|
let mut iter = path.bytes();
|
|
|
assert_eq!(None, iter.rposition(|c| *c == b'd'));
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_join() {
|
|
|
let path = HgPathBuf::from_bytes(b"a").join(HgPath::new(b"b"));
|
|
|
assert_eq!(b"a/b", path.as_bytes());
|
|
|
|
|
|
let path = HgPathBuf::from_bytes(b"a/").join(HgPath::new(b"b/c"));
|
|
|
assert_eq!(b"a/b/c", path.as_bytes());
|
|
|
|
|
|
// No leading slash if empty before join
|
|
|
let path = HgPathBuf::new().join(HgPath::new(b"b/c"));
|
|
|
assert_eq!(b"b/c", path.as_bytes());
|
|
|
|
|
|
// The leading slash is an invalid representation of an `HgPath`, but
|
|
|
// it can happen. This creates another invalid representation of
|
|
|
// consecutive bytes.
|
|
|
// TODO What should be done in this case? Should we silently remove
|
|
|
// the extra slash? Should we change the signature to a problematic
|
|
|
// `Result<HgPathBuf, HgPathError>`, or should we just keep it so and
|
|
|
// let the error happen upon filesystem interaction?
|
|
|
let path = HgPathBuf::from_bytes(b"a/").join(HgPath::new(b"/b"));
|
|
|
assert_eq!(b"a//b", path.as_bytes());
|
|
|
let path = HgPathBuf::from_bytes(b"a").join(HgPath::new(b"/b"));
|
|
|
assert_eq!(b"a//b", path.as_bytes());
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_relative_to() {
|
|
|
let path = HgPath::new(b"");
|
|
|
let base = HgPath::new(b"");
|
|
|
assert_eq!(Some(path), path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"path");
|
|
|
let base = HgPath::new(b"");
|
|
|
assert_eq!(Some(path), path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"a");
|
|
|
let base = HgPath::new(b"b");
|
|
|
assert_eq!(None, path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"a/b");
|
|
|
let base = HgPath::new(b"a");
|
|
|
assert_eq!(None, path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"a/b");
|
|
|
let base = HgPath::new(b"a/");
|
|
|
assert_eq!(Some(HgPath::new(b"b")), path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"nested/path/to/b");
|
|
|
let base = HgPath::new(b"nested/path/");
|
|
|
assert_eq!(Some(HgPath::new(b"to/b")), path.relative_to(base));
|
|
|
|
|
|
let path = HgPath::new(b"ends/with/dir/");
|
|
|
let base = HgPath::new(b"ends/");
|
|
|
assert_eq!(Some(HgPath::new(b"with/dir/")), path.relative_to(base));
|
|
|
}
|
|
|
}
|
|
|
|
