зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
1.9 KiB
Rust
82 строки
1.9 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#![allow(unsafe_code)]
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//! A replacement for `Box<str>` that has a defined layout for FFI.
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use crate::owned_slice::OwnedSlice;
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use std::fmt;
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use std::ops::{Deref, DerefMut};
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/// A struct that basically replaces a Box<str>, but with a defined layout,
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/// suitable for FFI.
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#[repr(C)]
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#[derive(Clone, Default, Eq, MallocSizeOf, PartialEq, ToShmem)]
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pub struct OwnedStr(OwnedSlice<u8>);
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impl fmt::Debug for OwnedStr {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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self.deref().fmt(formatter)
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}
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}
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impl Deref for OwnedStr {
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type Target = str;
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#[inline(always)]
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fn deref(&self) -> &Self::Target {
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unsafe { std::str::from_utf8_unchecked(&*self.0) }
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}
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}
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impl DerefMut for OwnedStr {
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#[inline(always)]
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fn deref_mut(&mut self) -> &mut Self::Target {
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unsafe { std::str::from_utf8_unchecked_mut(&mut *self.0) }
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}
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}
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impl OwnedStr {
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/// Convert the OwnedStr into a boxed str.
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#[inline]
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pub fn into_box(self) -> Box<str> {
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self.into_string().into_boxed_str()
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}
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/// Convert the OwnedStr into a `String`.
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#[inline]
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pub fn into_string(self) -> String {
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unsafe { String::from_utf8_unchecked(self.0.into_vec()) }
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}
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}
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impl From<OwnedStr> for String {
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#[inline]
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fn from(b: OwnedStr) -> Self {
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b.into_string()
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}
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}
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impl From<OwnedStr> for Box<str> {
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#[inline]
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fn from(b: OwnedStr) -> Self {
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b.into_box()
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}
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}
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impl From<Box<str>> for OwnedStr {
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#[inline]
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fn from(b: Box<str>) -> Self {
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Self::from(b.into_string())
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}
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}
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impl From<String> for OwnedStr {
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#[inline]
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fn from(s: String) -> Self {
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OwnedStr(s.into_bytes().into())
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}
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}
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