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os_str.rs
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os_str.rs
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! A type that can represent all platform-native strings, but is cheaply
//! interconvertable with Rust strings.
//!
//! The need for this type arises from the fact that:
//!
//! * On Unix systems, strings are often arbitrary sequences of non-zero
//! bytes, in many cases interpreted as UTF-8.
//!
//! * On Windows, strings are often arbitrary sequences of non-zero 16-bit
//! values, interpreted as UTF-16 when it is valid to do so.
//!
//! * In Rust, strings are always valid UTF-8, but may contain zeros.
//!
//! The types in this module bridge this gap by simultaneously representing Rust
//! and platform-native string values, and in particular allowing a Rust string
//! to be converted into an "OS" string with no cost.
//!
//! **Note**: At the moment, these types are extremely bare-bones, usable only
//! for conversion to/from various other string types. Eventually these types
//! will offer a full-fledged string API.
#![unstable(feature = "os",
reason = "recently added as part of path/io reform")]
use core::prelude::*;
use core::borrow::{BorrowFrom, ToOwned};
use fmt::{self, Debug};
use mem;
use string::{String, CowString};
use ops;
use cmp;
use hash::{Hash, Hasher, Writer};
use old_path::{Path, GenericPath};
use sys::os_str::{Buf, Slice};
use sys_common::{AsInner, IntoInner, FromInner};
use super::AsOsStr;
/// Owned, mutable OS strings.
#[derive(Clone)]
pub struct OsString {
inner: Buf
}
/// Slices into OS strings.
pub struct OsStr {
inner: Slice
}
impl OsString {
/// Constructs an `OsString` at no cost by consuming a `String`.
pub fn from_string(s: String) -> OsString {
OsString { inner: Buf::from_string(s) }
}
/// Constructs an `OsString` by copying from a `&str` slice.
///
/// Equivalent to: `OsString::from_string(String::from_str(s))`.
pub fn from_str(s: &str) -> OsString {
OsString { inner: Buf::from_str(s) }
}
/// Constructs a new empty `OsString`.
pub fn new() -> OsString {
OsString { inner: Buf::from_string(String::new()) }
}
/// Convert the `OsString` into a `String` if it contains valid Unicode data.
///
/// On failure, ownership of the original `OsString` is returned.
pub fn into_string(self) -> Result<String, OsString> {
self.inner.into_string().map_err(|buf| OsString { inner: buf} )
}
/// Extend the string with the given `&OsStr` slice.
pub fn push_os_str(&mut self, s: &OsStr) {
self.inner.push_slice(&s.inner)
}
}
impl ops::Index<ops::RangeFull> for OsString {
type Output = OsStr;
#[inline]
fn index(&self, _index: &ops::RangeFull) -> &OsStr {
unsafe { mem::transmute(self.inner.as_slice()) }
}
}
impl ops::Deref for OsString {
type Target = OsStr;
#[inline]
fn deref(&self) -> &OsStr {
&self[]
}
}
impl Debug for OsString {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt::Debug::fmt(&**self, formatter)
}
}
impl PartialEq for OsString {
fn eq(&self, other: &OsString) -> bool {
&**self == &**other
}
}
impl PartialEq<str> for OsString {
fn eq(&self, other: &str) -> bool {
&**self == other
}
}
impl PartialEq<OsString> for str {
fn eq(&self, other: &OsString) -> bool {
&**other == self
}
}
impl Eq for OsString {}
impl PartialOrd for OsString {
#[inline]
fn partial_cmp(&self, other: &OsString) -> Option<cmp::Ordering> {
(&**self).partial_cmp(&**other)
}
#[inline]
fn lt(&self, other: &OsString) -> bool { &**self < &**other }
#[inline]
fn le(&self, other: &OsString) -> bool { &**self <= &**other }
#[inline]
fn gt(&self, other: &OsString) -> bool { &**self > &**other }
#[inline]
fn ge(&self, other: &OsString) -> bool { &**self >= &**other }
}
impl PartialOrd<str> for OsString {
#[inline]
fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> {
(&**self).partial_cmp(other)
}
}
impl Ord for OsString {
#[inline]
fn cmp(&self, other: &OsString) -> cmp::Ordering {
(&**self).cmp(&**other)
}
}
impl<'a, S: Hasher + Writer> Hash<S> for OsString {
#[inline]
fn hash(&self, state: &mut S) {
(&**self).hash(state)
}
}
impl OsStr {
/// Coerce directly from a `&str` slice to a `&OsStr` slice.
pub fn from_str(s: &str) -> &OsStr {
unsafe { mem::transmute(Slice::from_str(s)) }
}
/// Yield a `&str` slice if the `OsStr` is valid unicode.
///
/// This conversion may entail doing a check for UTF-8 validity.
pub fn to_str(&self) -> Option<&str> {
self.inner.to_str()
}
/// Convert an `OsStr` to a `CowString`.
///
/// Any non-Unicode sequences are replaced with U+FFFD REPLACEMENT CHARACTER.
pub fn to_string_lossy(&self) -> CowString {
self.inner.to_string_lossy()
}
/// Copy the slice into an owned `OsString`.
pub fn to_os_string(&self) -> OsString {
OsString { inner: self.inner.to_owned() }
}
/// Get the underlying byte representation.
///
/// Note: it is *crucial* that this API is private, to avoid
/// revealing the internal, platform-specific encodings.
fn bytes(&self) -> &[u8] {
unsafe { mem::transmute(&self.inner) }
}
}
impl PartialEq for OsStr {
fn eq(&self, other: &OsStr) -> bool {
self.bytes().eq(other.bytes())
}
}
impl PartialEq<str> for OsStr {
fn eq(&self, other: &str) -> bool {
*self == *OsStr::from_str(other)
}
}
impl PartialEq<OsStr> for str {
fn eq(&self, other: &OsStr) -> bool {
*other == *OsStr::from_str(self)
}
}
impl Eq for OsStr {}
impl PartialOrd for OsStr {
#[inline]
fn partial_cmp(&self, other: &OsStr) -> Option<cmp::Ordering> {
self.bytes().partial_cmp(other.bytes())
}
#[inline]
fn lt(&self, other: &OsStr) -> bool { self.bytes().lt(other.bytes()) }
#[inline]
fn le(&self, other: &OsStr) -> bool { self.bytes().le(other.bytes()) }
#[inline]
fn gt(&self, other: &OsStr) -> bool { self.bytes().gt(other.bytes()) }
#[inline]
fn ge(&self, other: &OsStr) -> bool { self.bytes().ge(other.bytes()) }
}
impl PartialOrd<str> for OsStr {
#[inline]
fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> {
self.partial_cmp(OsStr::from_str(other))
}
}
// FIXME (#19470): cannot provide PartialOrd<OsStr> for str until we
// have more flexible coherence rules.
impl Ord for OsStr {
#[inline]
fn cmp(&self, other: &OsStr) -> cmp::Ordering { self.bytes().cmp(other.bytes()) }
}
impl<'a, S: Hasher + Writer> Hash<S> for OsStr {
#[inline]
fn hash(&self, state: &mut S) {
self.bytes().hash(state)
}
}
impl Debug for OsStr {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
self.inner.fmt(formatter)
}
}
impl BorrowFrom<OsString> for OsStr {
fn borrow_from(owned: &OsString) -> &OsStr { &owned[] }
}
impl ToOwned<OsString> for OsStr {
fn to_owned(&self) -> OsString { self.to_os_string() }
}
impl<'a, T: AsOsStr + ?Sized> AsOsStr for &'a T {
fn as_os_str(&self) -> &OsStr {
(*self).as_os_str()
}
}
impl AsOsStr for OsStr {
fn as_os_str(&self) -> &OsStr {
self
}
}
impl AsOsStr for OsString {
fn as_os_str(&self) -> &OsStr {
&self[]
}
}
impl AsOsStr for str {
fn as_os_str(&self) -> &OsStr {
OsStr::from_str(self)
}
}
impl AsOsStr for String {
fn as_os_str(&self) -> &OsStr {
OsStr::from_str(&self[])
}
}
#[cfg(unix)]
impl AsOsStr for Path {
fn as_os_str(&self) -> &OsStr {
unsafe { mem::transmute(self.as_vec()) }
}
}
#[cfg(windows)]
impl AsOsStr for Path {
fn as_os_str(&self) -> &OsStr {
// currently .as_str() is actually infallible on windows
OsStr::from_str(self.as_str().unwrap())
}
}
impl FromInner<Buf> for OsString {
fn from_inner(buf: Buf) -> OsString {
OsString { inner: buf }
}
}
impl IntoInner<Buf> for OsString {
fn into_inner(self) -> Buf {
self.inner
}
}
impl AsInner<Slice> for OsStr {
fn as_inner(&self) -> &Slice {
&self.inner
}
}