1441 lines
43 KiB
Rust
1441 lines
43 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//
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// ignore-lexer-test FIXME #15679
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//! An owned, growable string that enforces that its contents are valid UTF-8.
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#![stable(feature = "rust1", since = "1.0.0")]
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use core::prelude::*;
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use core::borrow::{Cow, IntoCow};
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use core::default::Default;
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use core::error::Error;
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use core::fmt;
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use core::hash;
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use core::iter::FromIterator;
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use core::mem;
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use core::ops::{self, Deref, Add, Index};
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use core::ptr;
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use core::raw::Slice as RawSlice;
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use unicode::str as unicode_str;
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use unicode::str::Utf16Item;
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use str::{self, CharRange, FromStr, Utf8Error};
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use vec::{DerefVec, Vec, as_vec};
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/// A growable string stored as a UTF-8 encoded buffer.
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#[derive(Clone, PartialOrd, Eq, Ord)]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct String {
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vec: Vec<u8>,
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}
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/// A possible error value from the `String::from_utf8` function.
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#[stable(feature = "rust1", since = "1.0.0")]
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#[derive(Debug)]
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pub struct FromUtf8Error {
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bytes: Vec<u8>,
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error: Utf8Error,
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}
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/// A possible error value from the `String::from_utf16` function.
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#[stable(feature = "rust1", since = "1.0.0")]
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#[derive(Debug)]
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pub struct FromUtf16Error(());
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impl String {
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/// Creates a new string buffer initialized with the empty string.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::new();
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn new() -> String {
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String {
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vec: Vec::new(),
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}
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}
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/// Creates a new string buffer with the given capacity.
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/// The string will be able to hold exactly `capacity` bytes without
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/// reallocating. If `capacity` is 0, the string will not allocate.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::with_capacity(10);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn with_capacity(capacity: usize) -> String {
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String {
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vec: Vec::with_capacity(capacity),
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}
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}
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/// Creates a new string buffer from the given string.
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///
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/// # Examples
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///
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/// ```
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/// let s = String::from_str("hello");
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/// assert_eq!(s.as_slice(), "hello");
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/// ```
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#[inline]
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#[unstable(feature = "collections",
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reason = "needs investigation to see if to_string() can match perf")]
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pub fn from_str(string: &str) -> String {
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String { vec: ::slice::SliceExt::to_vec(string.as_bytes()) }
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}
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/// Returns the vector as a string buffer, if possible, taking care not to
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/// copy it.
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///
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/// # Failure
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///
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/// If the given vector is not valid UTF-8, then the original vector and the
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/// corresponding error is returned.
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///
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/// # Examples
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///
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/// ```rust
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/// use std::str::Utf8Error;
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///
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/// let hello_vec = vec![104, 101, 108, 108, 111];
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/// let s = String::from_utf8(hello_vec).unwrap();
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/// assert_eq!(s, "hello");
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///
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/// let invalid_vec = vec![240, 144, 128];
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/// let s = String::from_utf8(invalid_vec).err().unwrap();
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/// assert_eq!(s.utf8_error(), Utf8Error::TooShort);
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/// assert_eq!(s.into_bytes(), vec![240, 144, 128]);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn from_utf8(vec: Vec<u8>) -> Result<String, FromUtf8Error> {
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match str::from_utf8(&vec) {
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Ok(..) => Ok(String { vec: vec }),
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Err(e) => Err(FromUtf8Error { bytes: vec, error: e })
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}
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}
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/// Converts a vector of bytes to a new UTF-8 string.
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/// Any invalid UTF-8 sequences are replaced with U+FFFD REPLACEMENT CHARACTER.
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///
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/// # Examples
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///
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/// ```rust
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/// let input = b"Hello \xF0\x90\x80World";
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/// let output = String::from_utf8_lossy(input);
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/// assert_eq!(output.as_slice(), "Hello \u{FFFD}World");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn from_utf8_lossy<'a>(v: &'a [u8]) -> CowString<'a> {
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let mut i = 0;
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match str::from_utf8(v) {
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Ok(s) => return Cow::Borrowed(s),
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Err(e) => {
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if let Utf8Error::InvalidByte(firstbad) = e {
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i = firstbad;
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}
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}
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}
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static TAG_CONT_U8: u8 = 128u8;
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static REPLACEMENT: &'static [u8] = b"\xEF\xBF\xBD"; // U+FFFD in UTF-8
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let total = v.len();
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fn unsafe_get(xs: &[u8], i: usize) -> u8 {
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unsafe { *xs.get_unchecked(i) }
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}
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fn safe_get(xs: &[u8], i: usize, total: usize) -> u8 {
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if i >= total {
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0
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} else {
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unsafe_get(xs, i)
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}
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}
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let mut res = String::with_capacity(total);
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if i > 0 {
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unsafe {
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res.as_mut_vec().push_all(&v[..i])
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};
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}
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// subseqidx is the index of the first byte of the subsequence we're looking at.
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// It's used to copy a bunch of contiguous good codepoints at once instead of copying
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// them one by one.
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let mut subseqidx = i;
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while i < total {
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let i_ = i;
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let byte = unsafe_get(v, i);
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i += 1;
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macro_rules! error { () => ({
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unsafe {
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if subseqidx != i_ {
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res.as_mut_vec().push_all(&v[subseqidx..i_]);
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}
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subseqidx = i;
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res.as_mut_vec().push_all(REPLACEMENT);
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}
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})}
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if byte < 128u8 {
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// subseqidx handles this
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} else {
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let w = unicode_str::utf8_char_width(byte);
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match w {
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2 => {
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if safe_get(v, i, total) & 192u8 != TAG_CONT_U8 {
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error!();
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continue;
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}
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i += 1;
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}
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3 => {
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match (byte, safe_get(v, i, total)) {
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(0xE0 , 0xA0 ... 0xBF) => (),
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(0xE1 ... 0xEC, 0x80 ... 0xBF) => (),
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(0xED , 0x80 ... 0x9F) => (),
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(0xEE ... 0xEF, 0x80 ... 0xBF) => (),
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_ => {
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error!();
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continue;
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}
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}
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i += 1;
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if safe_get(v, i, total) & 192u8 != TAG_CONT_U8 {
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error!();
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continue;
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}
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i += 1;
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}
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4 => {
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match (byte, safe_get(v, i, total)) {
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(0xF0 , 0x90 ... 0xBF) => (),
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(0xF1 ... 0xF3, 0x80 ... 0xBF) => (),
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(0xF4 , 0x80 ... 0x8F) => (),
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_ => {
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error!();
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continue;
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}
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}
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i += 1;
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if safe_get(v, i, total) & 192u8 != TAG_CONT_U8 {
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error!();
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continue;
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}
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i += 1;
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if safe_get(v, i, total) & 192u8 != TAG_CONT_U8 {
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error!();
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continue;
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}
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i += 1;
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}
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_ => {
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error!();
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continue;
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}
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}
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}
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}
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if subseqidx < total {
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unsafe {
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res.as_mut_vec().push_all(&v[subseqidx..total])
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};
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}
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Cow::Owned(res)
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}
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/// Decode a UTF-16 encoded vector `v` into a `String`, returning `None`
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/// if `v` contains any invalid data.
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///
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/// # Examples
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///
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/// ```rust
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/// // 𝄞music
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/// let mut v = &mut [0xD834, 0xDD1E, 0x006d, 0x0075,
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/// 0x0073, 0x0069, 0x0063];
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/// assert_eq!(String::from_utf16(v).unwrap(),
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/// "𝄞music".to_string());
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///
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/// // 𝄞mu<invalid>ic
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/// v[4] = 0xD800;
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/// assert!(String::from_utf16(v).is_err());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn from_utf16(v: &[u16]) -> Result<String, FromUtf16Error> {
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let mut s = String::with_capacity(v.len());
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for c in unicode_str::utf16_items(v) {
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match c {
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Utf16Item::ScalarValue(c) => s.push(c),
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Utf16Item::LoneSurrogate(_) => return Err(FromUtf16Error(())),
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}
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}
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Ok(s)
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}
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/// Decode a UTF-16 encoded vector `v` into a string, replacing
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/// invalid data with the replacement character (U+FFFD).
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///
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/// # Examples
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///
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/// ```rust
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/// // 𝄞mus<invalid>ic<invalid>
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/// let v = &[0xD834, 0xDD1E, 0x006d, 0x0075,
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/// 0x0073, 0xDD1E, 0x0069, 0x0063,
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/// 0xD834];
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///
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/// assert_eq!(String::from_utf16_lossy(v),
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/// "𝄞mus\u{FFFD}ic\u{FFFD}".to_string());
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn from_utf16_lossy(v: &[u16]) -> String {
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unicode_str::utf16_items(v).map(|c| c.to_char_lossy()).collect()
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}
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/// Creates a new `String` from a length, capacity, and pointer.
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///
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/// This is unsafe because:
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/// * We call `Vec::from_raw_parts` to get a `Vec<u8>`;
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/// * We assume that the `Vec` contains valid UTF-8.
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub unsafe fn from_raw_parts(buf: *mut u8, length: usize, capacity: usize) -> String {
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String {
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vec: Vec::from_raw_parts(buf, length, capacity),
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}
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}
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/// Converts a vector of bytes to a new `String` without checking if
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/// it contains valid UTF-8. This is unsafe because it assumes that
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/// the UTF-8-ness of the vector has already been validated.
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> String {
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String { vec: bytes }
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}
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/// Return the underlying byte buffer, encoded as UTF-8.
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///
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/// # Examples
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///
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/// ```
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/// let s = String::from_str("hello");
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/// let bytes = s.into_bytes();
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/// assert_eq!(bytes, vec![104, 101, 108, 108, 111]);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn into_bytes(self) -> Vec<u8> {
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self.vec
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}
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/// Pushes the given string onto this string buffer.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::from_str("foo");
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/// s.push_str("bar");
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/// assert_eq!(s.as_slice(), "foobar");
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn push_str(&mut self, string: &str) {
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self.vec.push_all(string.as_bytes())
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}
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/// Returns the number of bytes that this string buffer can hold without
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/// reallocating.
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///
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/// # Examples
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///
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/// ```
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/// let s = String::with_capacity(10);
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/// assert!(s.capacity() >= 10);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn capacity(&self) -> usize {
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self.vec.capacity()
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}
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/// Reserves capacity for at least `additional` more bytes to be inserted
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/// in the given `String`. The collection may reserve more space to avoid
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/// frequent reallocations.
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///
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/// # Panics
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///
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/// Panics if the new capacity overflows `usize`.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::new();
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/// s.reserve(10);
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/// assert!(s.capacity() >= 10);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn reserve(&mut self, additional: usize) {
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self.vec.reserve(additional)
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}
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/// Reserves the minimum capacity for exactly `additional` more bytes to be
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/// inserted in the given `String`. Does nothing if the capacity is already
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/// sufficient.
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///
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/// Note that the allocator may give the collection more space than it
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/// requests. Therefore capacity can not be relied upon to be precisely
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/// minimal. Prefer `reserve` if future insertions are expected.
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///
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/// # Panics
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///
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/// Panics if the new capacity overflows `usize`.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::new();
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/// s.reserve(10);
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/// assert!(s.capacity() >= 10);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn reserve_exact(&mut self, additional: usize) {
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self.vec.reserve_exact(additional)
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}
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/// Shrinks the capacity of this string buffer to match its length.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::from_str("foo");
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/// s.reserve(100);
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/// assert!(s.capacity() >= 100);
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/// s.shrink_to_fit();
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/// assert_eq!(s.capacity(), 3);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn shrink_to_fit(&mut self) {
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self.vec.shrink_to_fit()
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}
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/// Adds the given character to the end of the string.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::from_str("abc");
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/// s.push('1');
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/// s.push('2');
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/// s.push('3');
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/// assert_eq!(s.as_slice(), "abc123");
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn push(&mut self, ch: char) {
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if (ch as u32) < 0x80 {
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self.vec.push(ch as u8);
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return;
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}
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let cur_len = self.len();
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// This may use up to 4 bytes.
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self.vec.reserve(4);
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unsafe {
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// Attempt to not use an intermediate buffer by just pushing bytes
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// directly onto this string.
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let slice = RawSlice {
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data: self.vec.as_ptr().offset(cur_len as isize),
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len: 4,
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};
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let used = ch.encode_utf8(mem::transmute(slice)).unwrap_or(0);
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self.vec.set_len(cur_len + used);
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}
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}
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/// Works with the underlying buffer as a byte slice.
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///
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/// # Examples
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///
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/// ```
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/// let s = String::from_str("hello");
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/// let b: &[_] = &[104, 101, 108, 108, 111];
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/// assert_eq!(s.as_bytes(), b);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn as_bytes(&self) -> &[u8] {
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&self.vec
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}
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/// Shortens a string to the specified length.
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///
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/// # Panics
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///
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/// Panics if `new_len` > current length,
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/// or if `new_len` is not a character boundary.
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///
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/// # Examples
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///
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/// ```
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/// let mut s = String::from_str("hello");
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/// s.truncate(2);
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/// assert_eq!(s.as_slice(), "he");
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn truncate(&mut self, new_len: usize) {
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assert!(self.is_char_boundary(new_len));
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self.vec.truncate(new_len)
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}
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|
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/// Removes the last character from the string buffer and returns it.
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/// Returns `None` if this string buffer is empty.
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///
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/// # Examples
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///
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/// ```
|
|
/// let mut s = String::from_str("foo");
|
|
/// assert_eq!(s.pop(), Some('o'));
|
|
/// assert_eq!(s.pop(), Some('o'));
|
|
/// assert_eq!(s.pop(), Some('f'));
|
|
/// assert_eq!(s.pop(), None);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn pop(&mut self) -> Option<char> {
|
|
let len = self.len();
|
|
if len == 0 {
|
|
return None
|
|
}
|
|
|
|
let CharRange {ch, next} = self.char_range_at_reverse(len);
|
|
unsafe {
|
|
self.vec.set_len(next);
|
|
}
|
|
Some(ch)
|
|
}
|
|
|
|
/// Removes the character from the string buffer at byte position `idx` and
|
|
/// returns it.
|
|
///
|
|
/// # Warning
|
|
///
|
|
/// This is an O(n) operation as it requires copying every element in the
|
|
/// buffer.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// If `idx` does not lie on a character boundary, or if it is out of
|
|
/// bounds, then this function will panic.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// let mut s = String::from_str("foo");
|
|
/// assert_eq!(s.remove(0), 'f');
|
|
/// assert_eq!(s.remove(1), 'o');
|
|
/// assert_eq!(s.remove(0), 'o');
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn remove(&mut self, idx: usize) -> char {
|
|
let len = self.len();
|
|
assert!(idx <= len);
|
|
|
|
let CharRange { ch, next } = self.char_range_at(idx);
|
|
unsafe {
|
|
ptr::copy_memory(self.vec.as_mut_ptr().offset(idx as isize),
|
|
self.vec.as_ptr().offset(next as isize),
|
|
len - next);
|
|
self.vec.set_len(len - (next - idx));
|
|
}
|
|
ch
|
|
}
|
|
|
|
/// Insert a character into the string buffer at byte position `idx`.
|
|
///
|
|
/// # Warning
|
|
///
|
|
/// This is an O(n) operation as it requires copying every element in the
|
|
/// buffer.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// If `idx` does not lie on a character boundary or is out of bounds, then
|
|
/// this function will panic.
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn insert(&mut self, idx: usize, ch: char) {
|
|
let len = self.len();
|
|
assert!(idx <= len);
|
|
assert!(self.is_char_boundary(idx));
|
|
self.vec.reserve(4);
|
|
let mut bits = [0; 4];
|
|
let amt = ch.encode_utf8(&mut bits).unwrap();
|
|
|
|
unsafe {
|
|
ptr::copy_memory(self.vec.as_mut_ptr().offset((idx + amt) as isize),
|
|
self.vec.as_ptr().offset(idx as isize),
|
|
len - idx);
|
|
ptr::copy_memory(self.vec.as_mut_ptr().offset(idx as isize),
|
|
bits.as_ptr(),
|
|
amt);
|
|
self.vec.set_len(len + amt);
|
|
}
|
|
}
|
|
|
|
/// Views the string buffer as a mutable sequence of bytes.
|
|
///
|
|
/// This is unsafe because it does not check
|
|
/// to ensure that the resulting string will be valid UTF-8.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// let mut s = String::from_str("hello");
|
|
/// unsafe {
|
|
/// let vec = s.as_mut_vec();
|
|
/// assert!(vec == &mut vec![104, 101, 108, 108, 111]);
|
|
/// vec.reverse();
|
|
/// }
|
|
/// assert_eq!(s.as_slice(), "olleh");
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub unsafe fn as_mut_vec(&mut self) -> &mut Vec<u8> {
|
|
&mut self.vec
|
|
}
|
|
|
|
/// Return the number of bytes in this string.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// let a = "foo".to_string();
|
|
/// assert_eq!(a.len(), 3);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn len(&self) -> usize { self.vec.len() }
|
|
|
|
/// Returns true if the string contains no bytes
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// let mut v = String::new();
|
|
/// assert!(v.is_empty());
|
|
/// v.push('a');
|
|
/// assert!(!v.is_empty());
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn is_empty(&self) -> bool { self.len() == 0 }
|
|
|
|
/// Truncates the string, returning it to 0 length.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// let mut s = "foo".to_string();
|
|
/// s.clear();
|
|
/// assert!(s.is_empty());
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn clear(&mut self) {
|
|
self.vec.clear()
|
|
}
|
|
}
|
|
|
|
impl FromUtf8Error {
|
|
/// Consume this error, returning the bytes that were attempted to make a
|
|
/// `String` with.
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn into_bytes(self) -> Vec<u8> { self.bytes }
|
|
|
|
/// Access the underlying UTF8-error that was the cause of this error.
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn utf8_error(&self) -> Utf8Error { self.error }
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl fmt::Display for FromUtf8Error {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt::Display::fmt(&self.error, f)
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl Error for FromUtf8Error {
|
|
fn description(&self) -> &str { "invalid utf-8" }
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl fmt::Display for FromUtf16Error {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt::Display::fmt("invalid utf-16: lone surrogate found", f)
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl Error for FromUtf16Error {
|
|
fn description(&self) -> &str { "invalid utf-16" }
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl FromIterator<char> for String {
|
|
fn from_iter<I:Iterator<Item=char>>(iterator: I) -> String {
|
|
let mut buf = String::new();
|
|
buf.extend(iterator);
|
|
buf
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<'a> FromIterator<&'a str> for String {
|
|
fn from_iter<I:Iterator<Item=&'a str>>(iterator: I) -> String {
|
|
let mut buf = String::new();
|
|
buf.extend(iterator);
|
|
buf
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "collections",
|
|
reason = "waiting on Extend stabilization")]
|
|
impl Extend<char> for String {
|
|
fn extend<I:Iterator<Item=char>>(&mut self, iterator: I) {
|
|
let (lower_bound, _) = iterator.size_hint();
|
|
self.reserve(lower_bound);
|
|
for ch in iterator {
|
|
self.push(ch)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "collections",
|
|
reason = "waiting on Extend stabilization")]
|
|
impl<'a> Extend<&'a str> for String {
|
|
fn extend<I: Iterator<Item=&'a str>>(&mut self, iterator: I) {
|
|
// A guess that at least one byte per iterator element will be needed.
|
|
let (lower_bound, _) = iterator.size_hint();
|
|
self.reserve(lower_bound);
|
|
for s in iterator {
|
|
self.push_str(s)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl PartialEq for String {
|
|
#[inline]
|
|
fn eq(&self, other: &String) -> bool { PartialEq::eq(&**self, &**other) }
|
|
#[inline]
|
|
fn ne(&self, other: &String) -> bool { PartialEq::ne(&**self, &**other) }
|
|
}
|
|
|
|
macro_rules! impl_eq {
|
|
($lhs:ty, $rhs: ty) => {
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<'a> PartialEq<$rhs> for $lhs {
|
|
#[inline]
|
|
fn eq(&self, other: &$rhs) -> bool { PartialEq::eq(&**self, &**other) }
|
|
#[inline]
|
|
fn ne(&self, other: &$rhs) -> bool { PartialEq::ne(&**self, &**other) }
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<'a> PartialEq<$lhs> for $rhs {
|
|
#[inline]
|
|
fn eq(&self, other: &$lhs) -> bool { PartialEq::eq(&**self, &**other) }
|
|
#[inline]
|
|
fn ne(&self, other: &$lhs) -> bool { PartialEq::ne(&**self, &**other) }
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
impl_eq! { String, &'a str }
|
|
impl_eq! { CowString<'a>, String }
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<'a, 'b> PartialEq<&'b str> for CowString<'a> {
|
|
#[inline]
|
|
fn eq(&self, other: &&'b str) -> bool { PartialEq::eq(&**self, &**other) }
|
|
#[inline]
|
|
fn ne(&self, other: &&'b str) -> bool { PartialEq::ne(&**self, &**other) }
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<'a, 'b> PartialEq<CowString<'a>> for &'b str {
|
|
#[inline]
|
|
fn eq(&self, other: &CowString<'a>) -> bool { PartialEq::eq(&**self, &**other) }
|
|
#[inline]
|
|
fn ne(&self, other: &CowString<'a>) -> bool { PartialEq::ne(&**self, &**other) }
|
|
}
|
|
|
|
#[unstable(feature = "collections", reason = "waiting on Str stabilization")]
|
|
impl Str for String {
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
fn as_slice(&self) -> &str {
|
|
unsafe { mem::transmute(&*self.vec) }
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl Default for String {
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
fn default() -> String {
|
|
String::new()
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl fmt::Display for String {
|
|
#[inline]
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt::Display::fmt(&**self, f)
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl fmt::Debug for String {
|
|
#[inline]
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
fmt::Debug::fmt(&**self, f)
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "collections", reason = "waiting on Hash stabilization")]
|
|
impl<H: hash::Writer + hash::Hasher> hash::Hash<H> for String {
|
|
#[inline]
|
|
fn hash(&self, hasher: &mut H) {
|
|
(**self).hash(hasher)
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "collections",
|
|
reason = "recent addition, needs more experience")]
|
|
impl<'a> Add<&'a str> for String {
|
|
type Output = String;
|
|
|
|
#[inline]
|
|
fn add(mut self, other: &str) -> String {
|
|
self.push_str(other);
|
|
self
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl ops::Index<ops::Range<usize>> for String {
|
|
type Output = str;
|
|
#[inline]
|
|
fn index(&self, index: &ops::Range<usize>) -> &str {
|
|
&self[][*index]
|
|
}
|
|
}
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl ops::Index<ops::RangeTo<usize>> for String {
|
|
type Output = str;
|
|
#[inline]
|
|
fn index(&self, index: &ops::RangeTo<usize>) -> &str {
|
|
&self[][*index]
|
|
}
|
|
}
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl ops::Index<ops::RangeFrom<usize>> for String {
|
|
type Output = str;
|
|
#[inline]
|
|
fn index(&self, index: &ops::RangeFrom<usize>) -> &str {
|
|
&self[][*index]
|
|
}
|
|
}
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl ops::Index<ops::RangeFull> for String {
|
|
type Output = str;
|
|
#[inline]
|
|
fn index(&self, _index: &ops::RangeFull) -> &str {
|
|
unsafe { mem::transmute(&*self.vec) }
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl ops::Deref for String {
|
|
type Target = str;
|
|
|
|
#[inline]
|
|
fn deref(&self) -> &str {
|
|
unsafe { mem::transmute(&self.vec[]) }
|
|
}
|
|
}
|
|
|
|
/// Wrapper type providing a `&String` reference via `Deref`.
|
|
#[unstable(feature = "collections")]
|
|
pub struct DerefString<'a> {
|
|
x: DerefVec<'a, u8>
|
|
}
|
|
|
|
impl<'a> Deref for DerefString<'a> {
|
|
type Target = String;
|
|
|
|
#[inline]
|
|
fn deref<'b>(&'b self) -> &'b String {
|
|
unsafe { mem::transmute(&*self.x) }
|
|
}
|
|
}
|
|
|
|
/// Convert a string slice to a wrapper type providing a `&String` reference.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::string::as_string;
|
|
///
|
|
/// fn string_consumer(s: String) {
|
|
/// assert_eq!(s, "foo".to_string());
|
|
/// }
|
|
///
|
|
/// let string = as_string("foo").clone();
|
|
/// string_consumer(string);
|
|
/// ```
|
|
#[unstable(feature = "collections")]
|
|
pub fn as_string<'a>(x: &'a str) -> DerefString<'a> {
|
|
DerefString { x: as_vec(x.as_bytes()) }
|
|
}
|
|
|
|
#[unstable(feature = "collections", reason = "associated error type may change")]
|
|
impl FromStr for String {
|
|
type Err = ();
|
|
#[inline]
|
|
fn from_str(s: &str) -> Result<String, ()> {
|
|
Ok(String::from_str(s))
|
|
}
|
|
}
|
|
|
|
/// A generic trait for converting a value to a string
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub trait ToString {
|
|
/// Converts the value of `self` to an owned string
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
fn to_string(&self) -> String;
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<T: fmt::Display + ?Sized> ToString for T {
|
|
#[inline]
|
|
fn to_string(&self) -> String {
|
|
use core::fmt::Write;
|
|
let mut buf = String::new();
|
|
let _ = buf.write_fmt(format_args!("{}", self));
|
|
buf.shrink_to_fit();
|
|
buf
|
|
}
|
|
}
|
|
|
|
impl IntoCow<'static, String, str> for String {
|
|
#[inline]
|
|
fn into_cow(self) -> CowString<'static> {
|
|
Cow::Owned(self)
|
|
}
|
|
}
|
|
|
|
impl<'a> IntoCow<'a, String, str> for &'a str {
|
|
#[inline]
|
|
fn into_cow(self) -> CowString<'a> {
|
|
Cow::Borrowed(self)
|
|
}
|
|
}
|
|
|
|
/// A clone-on-write string
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub type CowString<'a> = Cow<'a, String, str>;
|
|
|
|
impl<'a> Str for CowString<'a> {
|
|
#[inline]
|
|
fn as_slice<'b>(&'b self) -> &'b str {
|
|
&**self
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl fmt::Write for String {
|
|
#[inline]
|
|
fn write_str(&mut self, s: &str) -> fmt::Result {
|
|
self.push_str(s);
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use prelude::*;
|
|
use test::Bencher;
|
|
|
|
use str::Utf8Error;
|
|
use core::iter::repeat;
|
|
use super::{as_string, CowString};
|
|
|
|
#[test]
|
|
fn test_as_string() {
|
|
let x = "foo";
|
|
assert_eq!(x, &**as_string(x));
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_str() {
|
|
let owned: Option<::std::string::String> = "string".parse().ok();
|
|
assert_eq!(owned.as_ref().map(|s| &**s), Some("string"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_unsized_to_string() {
|
|
let s: &str = "abc";
|
|
let _: String = (*s).to_string();
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_utf8() {
|
|
let xs = b"hello".to_vec();
|
|
assert_eq!(String::from_utf8(xs).unwrap(),
|
|
String::from_str("hello"));
|
|
|
|
let xs = "ศไทย中华Việt Nam".as_bytes().to_vec();
|
|
assert_eq!(String::from_utf8(xs).unwrap(),
|
|
String::from_str("ศไทย中华Việt Nam"));
|
|
|
|
let xs = b"hello\xFF".to_vec();
|
|
let err = String::from_utf8(xs).err().unwrap();
|
|
assert_eq!(err.utf8_error(), Utf8Error::TooShort);
|
|
assert_eq!(err.into_bytes(), b"hello\xff".to_vec());
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_utf8_lossy() {
|
|
let xs = b"hello";
|
|
let ys: CowString = "hello".into_cow();
|
|
assert_eq!(String::from_utf8_lossy(xs), ys);
|
|
|
|
let xs = "ศไทย中华Việt Nam".as_bytes();
|
|
let ys: CowString = "ศไทย中华Việt Nam".into_cow();
|
|
assert_eq!(String::from_utf8_lossy(xs), ys);
|
|
|
|
let xs = b"Hello\xC2 There\xFF Goodbye";
|
|
assert_eq!(String::from_utf8_lossy(xs),
|
|
String::from_str("Hello\u{FFFD} There\u{FFFD} Goodbye").into_cow());
|
|
|
|
let xs = b"Hello\xC0\x80 There\xE6\x83 Goodbye";
|
|
assert_eq!(String::from_utf8_lossy(xs),
|
|
String::from_str("Hello\u{FFFD}\u{FFFD} There\u{FFFD} Goodbye").into_cow());
|
|
|
|
let xs = b"\xF5foo\xF5\x80bar";
|
|
assert_eq!(String::from_utf8_lossy(xs),
|
|
String::from_str("\u{FFFD}foo\u{FFFD}\u{FFFD}bar").into_cow());
|
|
|
|
let xs = b"\xF1foo\xF1\x80bar\xF1\x80\x80baz";
|
|
assert_eq!(String::from_utf8_lossy(xs),
|
|
String::from_str("\u{FFFD}foo\u{FFFD}bar\u{FFFD}baz").into_cow());
|
|
|
|
let xs = b"\xF4foo\xF4\x80bar\xF4\xBFbaz";
|
|
assert_eq!(String::from_utf8_lossy(xs),
|
|
String::from_str("\u{FFFD}foo\u{FFFD}bar\u{FFFD}\u{FFFD}baz").into_cow());
|
|
|
|
let xs = b"\xF0\x80\x80\x80foo\xF0\x90\x80\x80bar";
|
|
assert_eq!(String::from_utf8_lossy(xs), String::from_str("\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}\
|
|
foo\u{10000}bar").into_cow());
|
|
|
|
// surrogates
|
|
let xs = b"\xED\xA0\x80foo\xED\xBF\xBFbar";
|
|
assert_eq!(String::from_utf8_lossy(xs), String::from_str("\u{FFFD}\u{FFFD}\u{FFFD}foo\
|
|
\u{FFFD}\u{FFFD}\u{FFFD}bar").into_cow());
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_utf16() {
|
|
let pairs =
|
|
[(String::from_str("𐍅𐌿𐌻𐍆𐌹𐌻𐌰\n"),
|
|
vec![0xd800_u16, 0xdf45_u16, 0xd800_u16, 0xdf3f_u16,
|
|
0xd800_u16, 0xdf3b_u16, 0xd800_u16, 0xdf46_u16,
|
|
0xd800_u16, 0xdf39_u16, 0xd800_u16, 0xdf3b_u16,
|
|
0xd800_u16, 0xdf30_u16, 0x000a_u16]),
|
|
|
|
(String::from_str("𐐒𐑉𐐮𐑀𐐲𐑋 𐐏𐐲𐑍\n"),
|
|
vec![0xd801_u16, 0xdc12_u16, 0xd801_u16,
|
|
0xdc49_u16, 0xd801_u16, 0xdc2e_u16, 0xd801_u16,
|
|
0xdc40_u16, 0xd801_u16, 0xdc32_u16, 0xd801_u16,
|
|
0xdc4b_u16, 0x0020_u16, 0xd801_u16, 0xdc0f_u16,
|
|
0xd801_u16, 0xdc32_u16, 0xd801_u16, 0xdc4d_u16,
|
|
0x000a_u16]),
|
|
|
|
(String::from_str("𐌀𐌖𐌋𐌄𐌑𐌉·𐌌𐌄𐌕𐌄𐌋𐌉𐌑\n"),
|
|
vec![0xd800_u16, 0xdf00_u16, 0xd800_u16, 0xdf16_u16,
|
|
0xd800_u16, 0xdf0b_u16, 0xd800_u16, 0xdf04_u16,
|
|
0xd800_u16, 0xdf11_u16, 0xd800_u16, 0xdf09_u16,
|
|
0x00b7_u16, 0xd800_u16, 0xdf0c_u16, 0xd800_u16,
|
|
0xdf04_u16, 0xd800_u16, 0xdf15_u16, 0xd800_u16,
|
|
0xdf04_u16, 0xd800_u16, 0xdf0b_u16, 0xd800_u16,
|
|
0xdf09_u16, 0xd800_u16, 0xdf11_u16, 0x000a_u16 ]),
|
|
|
|
(String::from_str("𐒋𐒘𐒈𐒑𐒛𐒒 𐒕𐒓 𐒈𐒚𐒍 𐒏𐒜𐒒𐒖𐒆 𐒕𐒆\n"),
|
|
vec![0xd801_u16, 0xdc8b_u16, 0xd801_u16, 0xdc98_u16,
|
|
0xd801_u16, 0xdc88_u16, 0xd801_u16, 0xdc91_u16,
|
|
0xd801_u16, 0xdc9b_u16, 0xd801_u16, 0xdc92_u16,
|
|
0x0020_u16, 0xd801_u16, 0xdc95_u16, 0xd801_u16,
|
|
0xdc93_u16, 0x0020_u16, 0xd801_u16, 0xdc88_u16,
|
|
0xd801_u16, 0xdc9a_u16, 0xd801_u16, 0xdc8d_u16,
|
|
0x0020_u16, 0xd801_u16, 0xdc8f_u16, 0xd801_u16,
|
|
0xdc9c_u16, 0xd801_u16, 0xdc92_u16, 0xd801_u16,
|
|
0xdc96_u16, 0xd801_u16, 0xdc86_u16, 0x0020_u16,
|
|
0xd801_u16, 0xdc95_u16, 0xd801_u16, 0xdc86_u16,
|
|
0x000a_u16 ]),
|
|
// Issue #12318, even-numbered non-BMP planes
|
|
(String::from_str("\u{20000}"),
|
|
vec![0xD840, 0xDC00])];
|
|
|
|
for p in &pairs {
|
|
let (s, u) = (*p).clone();
|
|
let s_as_utf16 = s.utf16_units().collect::<Vec<u16>>();
|
|
let u_as_string = String::from_utf16(&u).unwrap();
|
|
|
|
assert!(::unicode::str::is_utf16(&u));
|
|
assert_eq!(s_as_utf16, u);
|
|
|
|
assert_eq!(u_as_string, s);
|
|
assert_eq!(String::from_utf16_lossy(&u), s);
|
|
|
|
assert_eq!(String::from_utf16(&s_as_utf16).unwrap(), s);
|
|
assert_eq!(u_as_string.utf16_units().collect::<Vec<u16>>(), u);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_utf16_invalid() {
|
|
// completely positive cases tested above.
|
|
// lead + eof
|
|
assert!(String::from_utf16(&[0xD800]).is_err());
|
|
// lead + lead
|
|
assert!(String::from_utf16(&[0xD800, 0xD800]).is_err());
|
|
|
|
// isolated trail
|
|
assert!(String::from_utf16(&[0x0061, 0xDC00]).is_err());
|
|
|
|
// general
|
|
assert!(String::from_utf16(&[0xD800, 0xd801, 0xdc8b, 0xD800]).is_err());
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_utf16_lossy() {
|
|
// completely positive cases tested above.
|
|
// lead + eof
|
|
assert_eq!(String::from_utf16_lossy(&[0xD800]), String::from_str("\u{FFFD}"));
|
|
// lead + lead
|
|
assert_eq!(String::from_utf16_lossy(&[0xD800, 0xD800]),
|
|
String::from_str("\u{FFFD}\u{FFFD}"));
|
|
|
|
// isolated trail
|
|
assert_eq!(String::from_utf16_lossy(&[0x0061, 0xDC00]), String::from_str("a\u{FFFD}"));
|
|
|
|
// general
|
|
assert_eq!(String::from_utf16_lossy(&[0xD800, 0xd801, 0xdc8b, 0xD800]),
|
|
String::from_str("\u{FFFD}𐒋\u{FFFD}"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_push_bytes() {
|
|
let mut s = String::from_str("ABC");
|
|
unsafe {
|
|
let mv = s.as_mut_vec();
|
|
mv.push_all(&[b'D']);
|
|
}
|
|
assert_eq!(s, "ABCD");
|
|
}
|
|
|
|
#[test]
|
|
fn test_push_str() {
|
|
let mut s = String::new();
|
|
s.push_str("");
|
|
assert_eq!(&s[0..], "");
|
|
s.push_str("abc");
|
|
assert_eq!(&s[0..], "abc");
|
|
s.push_str("ประเทศไทย中华Việt Nam");
|
|
assert_eq!(&s[0..], "abcประเทศไทย中华Việt Nam");
|
|
}
|
|
|
|
#[test]
|
|
fn test_push() {
|
|
let mut data = String::from_str("ประเทศไทย中");
|
|
data.push('华');
|
|
data.push('b'); // 1 byte
|
|
data.push('¢'); // 2 byte
|
|
data.push('€'); // 3 byte
|
|
data.push('𤭢'); // 4 byte
|
|
assert_eq!(data, "ประเทศไทย中华b¢€𤭢");
|
|
}
|
|
|
|
#[test]
|
|
fn test_pop() {
|
|
let mut data = String::from_str("ประเทศไทย中华b¢€𤭢");
|
|
assert_eq!(data.pop().unwrap(), '𤭢'); // 4 bytes
|
|
assert_eq!(data.pop().unwrap(), '€'); // 3 bytes
|
|
assert_eq!(data.pop().unwrap(), '¢'); // 2 bytes
|
|
assert_eq!(data.pop().unwrap(), 'b'); // 1 bytes
|
|
assert_eq!(data.pop().unwrap(), '华');
|
|
assert_eq!(data, "ประเทศไทย中");
|
|
}
|
|
|
|
#[test]
|
|
fn test_str_truncate() {
|
|
let mut s = String::from_str("12345");
|
|
s.truncate(5);
|
|
assert_eq!(s, "12345");
|
|
s.truncate(3);
|
|
assert_eq!(s, "123");
|
|
s.truncate(0);
|
|
assert_eq!(s, "");
|
|
|
|
let mut s = String::from_str("12345");
|
|
let p = s.as_ptr();
|
|
s.truncate(3);
|
|
s.push_str("6");
|
|
let p_ = s.as_ptr();
|
|
assert_eq!(p_, p);
|
|
}
|
|
|
|
#[test]
|
|
#[should_fail]
|
|
fn test_str_truncate_invalid_len() {
|
|
let mut s = String::from_str("12345");
|
|
s.truncate(6);
|
|
}
|
|
|
|
#[test]
|
|
#[should_fail]
|
|
fn test_str_truncate_split_codepoint() {
|
|
let mut s = String::from_str("\u{FC}"); // ü
|
|
s.truncate(1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_str_clear() {
|
|
let mut s = String::from_str("12345");
|
|
s.clear();
|
|
assert_eq!(s.len(), 0);
|
|
assert_eq!(s, "");
|
|
}
|
|
|
|
#[test]
|
|
fn test_str_add() {
|
|
let a = String::from_str("12345");
|
|
let b = a + "2";
|
|
let b = b + "2";
|
|
assert_eq!(b.len(), 7);
|
|
assert_eq!(b, "1234522");
|
|
}
|
|
|
|
#[test]
|
|
fn remove() {
|
|
let mut s = "ศไทย中华Việt Nam; foobar".to_string();;
|
|
assert_eq!(s.remove(0), 'ศ');
|
|
assert_eq!(s.len(), 33);
|
|
assert_eq!(s, "ไทย中华Việt Nam; foobar");
|
|
assert_eq!(s.remove(17), 'ệ');
|
|
assert_eq!(s, "ไทย中华Vit Nam; foobar");
|
|
}
|
|
|
|
#[test] #[should_fail]
|
|
fn remove_bad() {
|
|
"ศ".to_string().remove(1);
|
|
}
|
|
|
|
#[test]
|
|
fn insert() {
|
|
let mut s = "foobar".to_string();
|
|
s.insert(0, 'ệ');
|
|
assert_eq!(s, "ệfoobar");
|
|
s.insert(6, 'ย');
|
|
assert_eq!(s, "ệfooยbar");
|
|
}
|
|
|
|
#[test] #[should_fail] fn insert_bad1() { "".to_string().insert(1, 't'); }
|
|
#[test] #[should_fail] fn insert_bad2() { "ệ".to_string().insert(1, 't'); }
|
|
|
|
#[test]
|
|
fn test_slicing() {
|
|
let s = "foobar".to_string();
|
|
assert_eq!("foobar", &s[]);
|
|
assert_eq!("foo", &s[..3]);
|
|
assert_eq!("bar", &s[3..]);
|
|
assert_eq!("oob", &s[1..4]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_simple_types() {
|
|
assert_eq!(1.to_string(), "1");
|
|
assert_eq!((-1).to_string(), "-1");
|
|
assert_eq!(200.to_string(), "200");
|
|
assert_eq!(2u8.to_string(), "2");
|
|
assert_eq!(true.to_string(), "true");
|
|
assert_eq!(false.to_string(), "false");
|
|
assert_eq!(("hi".to_string()).to_string(), "hi");
|
|
}
|
|
|
|
#[test]
|
|
fn test_vectors() {
|
|
let x: Vec<i32> = vec![];
|
|
assert_eq!(format!("{:?}", x), "[]");
|
|
assert_eq!(format!("{:?}", vec![1]), "[1]");
|
|
assert_eq!(format!("{:?}", vec![1, 2, 3]), "[1, 2, 3]");
|
|
assert!(format!("{:?}", vec![vec![], vec![1], vec![1, 1]]) ==
|
|
"[[], [1], [1, 1]]");
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_iterator() {
|
|
let s = "ศไทย中华Việt Nam".to_string();
|
|
let t = "ศไทย中华";
|
|
let u = "Việt Nam";
|
|
|
|
let a: String = s.chars().collect();
|
|
assert_eq!(s, a);
|
|
|
|
let mut b = t.to_string();
|
|
b.extend(u.chars());
|
|
assert_eq!(s, b);
|
|
|
|
let c: String = vec![t, u].into_iter().collect();
|
|
assert_eq!(s, c);
|
|
|
|
let mut d = t.to_string();
|
|
d.extend(vec![u].into_iter());
|
|
assert_eq!(s, d);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_with_capacity(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
String::with_capacity(100)
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_push_str(b: &mut Bencher) {
|
|
let s = "ศไทย中华Việt Nam; Mary had a little lamb, Little lamb";
|
|
b.iter(|| {
|
|
let mut r = String::new();
|
|
r.push_str(s);
|
|
});
|
|
}
|
|
|
|
const REPETITIONS: u64 = 10_000;
|
|
|
|
#[bench]
|
|
fn bench_push_str_one_byte(b: &mut Bencher) {
|
|
b.bytes = REPETITIONS;
|
|
b.iter(|| {
|
|
let mut r = String::new();
|
|
for _ in 0..REPETITIONS {
|
|
r.push_str("a")
|
|
}
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_push_char_one_byte(b: &mut Bencher) {
|
|
b.bytes = REPETITIONS;
|
|
b.iter(|| {
|
|
let mut r = String::new();
|
|
for _ in 0..REPETITIONS {
|
|
r.push('a')
|
|
}
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_push_char_two_bytes(b: &mut Bencher) {
|
|
b.bytes = REPETITIONS * 2;
|
|
b.iter(|| {
|
|
let mut r = String::new();
|
|
for _ in 0..REPETITIONS {
|
|
r.push('â')
|
|
}
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn from_utf8_lossy_100_ascii(b: &mut Bencher) {
|
|
let s = b"Hello there, the quick brown fox jumped over the lazy dog! \
|
|
Lorem ipsum dolor sit amet, consectetur. ";
|
|
|
|
assert_eq!(100, s.len());
|
|
b.iter(|| {
|
|
let _ = String::from_utf8_lossy(s);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn from_utf8_lossy_100_multibyte(b: &mut Bencher) {
|
|
let s = "𐌀𐌖𐌋𐌄𐌑𐌉ปรدولة الكويتทศไทย中华𐍅𐌿𐌻𐍆𐌹𐌻𐌰".as_bytes();
|
|
assert_eq!(100, s.len());
|
|
b.iter(|| {
|
|
let _ = String::from_utf8_lossy(s);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn from_utf8_lossy_invalid(b: &mut Bencher) {
|
|
let s = b"Hello\xC0\x80 There\xE6\x83 Goodbye";
|
|
b.iter(|| {
|
|
let _ = String::from_utf8_lossy(s);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn from_utf8_lossy_100_invalid(b: &mut Bencher) {
|
|
let s = repeat(0xf5u8).take(100).collect::<Vec<_>>();
|
|
b.iter(|| {
|
|
let _ = String::from_utf8_lossy(&s);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_exact_size_shrink_to_fit(b: &mut Bencher) {
|
|
let s = "Hello there, the quick brown fox jumped over the lazy dog! \
|
|
Lorem ipsum dolor sit amet, consectetur. ";
|
|
// ensure our operation produces an exact-size string before we benchmark it
|
|
let mut r = String::with_capacity(s.len());
|
|
r.push_str(s);
|
|
assert_eq!(r.len(), r.capacity());
|
|
b.iter(|| {
|
|
let mut r = String::with_capacity(s.len());
|
|
r.push_str(s);
|
|
r.shrink_to_fit();
|
|
r
|
|
});
|
|
}
|
|
}
|