1277 lines
40 KiB
Rust
1277 lines
40 KiB
Rust
//! Implementation of [the WTF-8 encoding](https://simonsapin.github.io/wtf-8/).
|
||
//!
|
||
//! This library uses Rust’s type system to maintain
|
||
//! [well-formedness](https://simonsapin.github.io/wtf-8/#well-formed),
|
||
//! like the `String` and `&str` types do for UTF-8.
|
||
//!
|
||
//! Since [WTF-8 must not be used
|
||
//! for interchange](https://simonsapin.github.io/wtf-8/#intended-audience),
|
||
//! this library deliberately does not provide access to the underlying bytes
|
||
//! of WTF-8 strings,
|
||
//! nor can it decode WTF-8 from arbitrary bytes.
|
||
//! WTF-8 strings can be obtained from UTF-8, UTF-16, or code points.
|
||
|
||
// this module is imported from @SimonSapin's repo and has tons of dead code on
|
||
// unix (it's mostly used on windows), so don't worry about dead code here.
|
||
#![allow(dead_code)]
|
||
|
||
use core::str::next_code_point;
|
||
|
||
use crate::borrow::Cow;
|
||
use crate::char;
|
||
use crate::fmt;
|
||
use crate::hash::{Hash, Hasher};
|
||
use crate::iter::FromIterator;
|
||
use crate::mem;
|
||
use crate::ops;
|
||
use crate::rc::Rc;
|
||
use crate::slice;
|
||
use crate::str;
|
||
use crate::sync::Arc;
|
||
use crate::sys_common::AsInner;
|
||
|
||
const UTF8_REPLACEMENT_CHARACTER: &str = "\u{FFFD}";
|
||
|
||
/// A Unicode code point: from U+0000 to U+10FFFF.
|
||
///
|
||
/// Compares with the `char` type,
|
||
/// which represents a Unicode scalar value:
|
||
/// a code point that is not a surrogate (U+D800 to U+DFFF).
|
||
#[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy)]
|
||
pub struct CodePoint {
|
||
value: u32,
|
||
}
|
||
|
||
/// Format the code point as `U+` followed by four to six hexadecimal digits.
|
||
/// Example: `U+1F4A9`
|
||
impl fmt::Debug for CodePoint {
|
||
#[inline]
|
||
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
write!(formatter, "U+{:04X}", self.value)
|
||
}
|
||
}
|
||
|
||
impl CodePoint {
|
||
/// Unsafely creates a new `CodePoint` without checking the value.
|
||
///
|
||
/// Only use when `value` is known to be less than or equal to 0x10FFFF.
|
||
#[inline]
|
||
pub unsafe fn from_u32_unchecked(value: u32) -> CodePoint {
|
||
CodePoint { value }
|
||
}
|
||
|
||
/// Creates a new `CodePoint` if the value is a valid code point.
|
||
///
|
||
/// Returns `None` if `value` is above 0x10FFFF.
|
||
#[inline]
|
||
pub fn from_u32(value: u32) -> Option<CodePoint> {
|
||
match value {
|
||
0..=0x10FFFF => Some(CodePoint { value }),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
/// Creates a new `CodePoint` from a `char`.
|
||
///
|
||
/// Since all Unicode scalar values are code points, this always succeeds.
|
||
#[inline]
|
||
pub fn from_char(value: char) -> CodePoint {
|
||
CodePoint { value: value as u32 }
|
||
}
|
||
|
||
/// Returns the numeric value of the code point.
|
||
#[inline]
|
||
pub fn to_u32(&self) -> u32 {
|
||
self.value
|
||
}
|
||
|
||
/// Optionally returns a Unicode scalar value for the code point.
|
||
///
|
||
/// Returns `None` if the code point is a surrogate (from U+D800 to U+DFFF).
|
||
#[inline]
|
||
pub fn to_char(&self) -> Option<char> {
|
||
match self.value {
|
||
0xD800..=0xDFFF => None,
|
||
_ => Some(unsafe { char::from_u32_unchecked(self.value) }),
|
||
}
|
||
}
|
||
|
||
/// Returns a Unicode scalar value for the code point.
|
||
///
|
||
/// Returns `'\u{FFFD}'` (the replacement character “<>”)
|
||
/// if the code point is a surrogate (from U+D800 to U+DFFF).
|
||
#[inline]
|
||
pub fn to_char_lossy(&self) -> char {
|
||
self.to_char().unwrap_or('\u{FFFD}')
|
||
}
|
||
}
|
||
|
||
/// An owned, growable string of well-formed WTF-8 data.
|
||
///
|
||
/// Similar to `String`, but can additionally contain surrogate code points
|
||
/// if they’re not in a surrogate pair.
|
||
#[derive(Eq, PartialEq, Ord, PartialOrd, Clone)]
|
||
pub struct Wtf8Buf {
|
||
bytes: Vec<u8>,
|
||
}
|
||
|
||
impl ops::Deref for Wtf8Buf {
|
||
type Target = Wtf8;
|
||
|
||
fn deref(&self) -> &Wtf8 {
|
||
self.as_slice()
|
||
}
|
||
}
|
||
|
||
impl ops::DerefMut for Wtf8Buf {
|
||
fn deref_mut(&mut self) -> &mut Wtf8 {
|
||
self.as_mut_slice()
|
||
}
|
||
}
|
||
|
||
/// Format the string with double quotes,
|
||
/// and surrogates as `\u` followed by four hexadecimal digits.
|
||
/// Example: `"a\u{D800}"` for a string with code points [U+0061, U+D800]
|
||
impl fmt::Debug for Wtf8Buf {
|
||
#[inline]
|
||
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
fmt::Debug::fmt(&**self, formatter)
|
||
}
|
||
}
|
||
|
||
impl Wtf8Buf {
|
||
/// Creates a new, empty WTF-8 string.
|
||
#[inline]
|
||
pub fn new() -> Wtf8Buf {
|
||
Wtf8Buf { bytes: Vec::new() }
|
||
}
|
||
|
||
/// Creates a new, empty WTF-8 string with pre-allocated capacity for `capacity` bytes.
|
||
#[inline]
|
||
pub fn with_capacity(capacity: usize) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: Vec::with_capacity(capacity) }
|
||
}
|
||
|
||
/// Creates a WTF-8 string from a UTF-8 `String`.
|
||
///
|
||
/// This takes ownership of the `String` and does not copy.
|
||
///
|
||
/// Since WTF-8 is a superset of UTF-8, this always succeeds.
|
||
#[inline]
|
||
pub fn from_string(string: String) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: string.into_bytes() }
|
||
}
|
||
|
||
/// Creates a WTF-8 string from a UTF-8 `&str` slice.
|
||
///
|
||
/// This copies the content of the slice.
|
||
///
|
||
/// Since WTF-8 is a superset of UTF-8, this always succeeds.
|
||
#[inline]
|
||
pub fn from_str(str: &str) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: <[_]>::to_vec(str.as_bytes()) }
|
||
}
|
||
|
||
pub fn clear(&mut self) {
|
||
self.bytes.clear()
|
||
}
|
||
|
||
/// Creates a WTF-8 string from a potentially ill-formed UTF-16 slice of 16-bit code units.
|
||
///
|
||
/// This is lossless: calling `.encode_wide()` on the resulting string
|
||
/// will always return the original code units.
|
||
pub fn from_wide(v: &[u16]) -> Wtf8Buf {
|
||
let mut string = Wtf8Buf::with_capacity(v.len());
|
||
for item in char::decode_utf16(v.iter().cloned()) {
|
||
match item {
|
||
Ok(ch) => string.push_char(ch),
|
||
Err(surrogate) => {
|
||
let surrogate = surrogate.unpaired_surrogate();
|
||
// Surrogates are known to be in the code point range.
|
||
let code_point = unsafe { CodePoint::from_u32_unchecked(surrogate as u32) };
|
||
// Skip the WTF-8 concatenation check,
|
||
// surrogate pairs are already decoded by decode_utf16
|
||
string.push_code_point_unchecked(code_point)
|
||
}
|
||
}
|
||
}
|
||
string
|
||
}
|
||
|
||
/// Copied from String::push
|
||
/// This does **not** include the WTF-8 concatenation check.
|
||
fn push_code_point_unchecked(&mut self, code_point: CodePoint) {
|
||
let c = unsafe { char::from_u32_unchecked(code_point.value) };
|
||
let mut bytes = [0; 4];
|
||
let bytes = c.encode_utf8(&mut bytes).as_bytes();
|
||
self.bytes.extend_from_slice(bytes)
|
||
}
|
||
|
||
#[inline]
|
||
pub fn as_slice(&self) -> &Wtf8 {
|
||
unsafe { Wtf8::from_bytes_unchecked(&self.bytes) }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn as_mut_slice(&mut self) -> &mut Wtf8 {
|
||
unsafe { Wtf8::from_mut_bytes_unchecked(&mut self.bytes) }
|
||
}
|
||
|
||
/// Reserves capacity for at least `additional` more bytes to be inserted
|
||
/// in the given `Wtf8Buf`.
|
||
/// The collection may reserve more space to avoid frequent reallocations.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if the new capacity overflows `usize`.
|
||
#[inline]
|
||
pub fn reserve(&mut self, additional: usize) {
|
||
self.bytes.reserve(additional)
|
||
}
|
||
|
||
#[inline]
|
||
pub fn reserve_exact(&mut self, additional: usize) {
|
||
self.bytes.reserve_exact(additional)
|
||
}
|
||
|
||
#[inline]
|
||
pub fn shrink_to_fit(&mut self) {
|
||
self.bytes.shrink_to_fit()
|
||
}
|
||
|
||
#[inline]
|
||
pub fn shrink_to(&mut self, min_capacity: usize) {
|
||
self.bytes.shrink_to(min_capacity)
|
||
}
|
||
|
||
/// Returns the number of bytes that this string buffer can hold without reallocating.
|
||
#[inline]
|
||
pub fn capacity(&self) -> usize {
|
||
self.bytes.capacity()
|
||
}
|
||
|
||
/// Append a UTF-8 slice at the end of the string.
|
||
#[inline]
|
||
pub fn push_str(&mut self, other: &str) {
|
||
self.bytes.extend_from_slice(other.as_bytes())
|
||
}
|
||
|
||
/// Append a WTF-8 slice at the end of the string.
|
||
///
|
||
/// This replaces newly paired surrogates at the boundary
|
||
/// with a supplementary code point,
|
||
/// like concatenating ill-formed UTF-16 strings effectively would.
|
||
#[inline]
|
||
pub fn push_wtf8(&mut self, other: &Wtf8) {
|
||
match ((&*self).final_lead_surrogate(), other.initial_trail_surrogate()) {
|
||
// Replace newly paired surrogates by a supplementary code point.
|
||
(Some(lead), Some(trail)) => {
|
||
let len_without_lead_surrogate = self.len() - 3;
|
||
self.bytes.truncate(len_without_lead_surrogate);
|
||
let other_without_trail_surrogate = &other.bytes[3..];
|
||
// 4 bytes for the supplementary code point
|
||
self.bytes.reserve(4 + other_without_trail_surrogate.len());
|
||
self.push_char(decode_surrogate_pair(lead, trail));
|
||
self.bytes.extend_from_slice(other_without_trail_surrogate);
|
||
}
|
||
_ => self.bytes.extend_from_slice(&other.bytes),
|
||
}
|
||
}
|
||
|
||
/// Append a Unicode scalar value at the end of the string.
|
||
#[inline]
|
||
pub fn push_char(&mut self, c: char) {
|
||
self.push_code_point_unchecked(CodePoint::from_char(c))
|
||
}
|
||
|
||
/// Append a code point at the end of the string.
|
||
///
|
||
/// This replaces newly paired surrogates at the boundary
|
||
/// with a supplementary code point,
|
||
/// like concatenating ill-formed UTF-16 strings effectively would.
|
||
#[inline]
|
||
pub fn push(&mut self, code_point: CodePoint) {
|
||
if let trail @ 0xDC00..=0xDFFF = code_point.to_u32() {
|
||
if let Some(lead) = (&*self).final_lead_surrogate() {
|
||
let len_without_lead_surrogate = self.len() - 3;
|
||
self.bytes.truncate(len_without_lead_surrogate);
|
||
self.push_char(decode_surrogate_pair(lead, trail as u16));
|
||
return;
|
||
}
|
||
}
|
||
|
||
// No newly paired surrogates at the boundary.
|
||
self.push_code_point_unchecked(code_point)
|
||
}
|
||
|
||
/// Shortens a string to the specified length.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if `new_len` > current length,
|
||
/// or if `new_len` is not a code point boundary.
|
||
#[inline]
|
||
pub fn truncate(&mut self, new_len: usize) {
|
||
assert!(is_code_point_boundary(self, new_len));
|
||
self.bytes.truncate(new_len)
|
||
}
|
||
|
||
/// Consumes the WTF-8 string and tries to convert it to UTF-8.
|
||
///
|
||
/// This does not copy the data.
|
||
///
|
||
/// If the contents are not well-formed UTF-8
|
||
/// (that is, if the string contains surrogates),
|
||
/// the original WTF-8 string is returned instead.
|
||
pub fn into_string(self) -> Result<String, Wtf8Buf> {
|
||
match self.next_surrogate(0) {
|
||
None => Ok(unsafe { String::from_utf8_unchecked(self.bytes) }),
|
||
Some(_) => Err(self),
|
||
}
|
||
}
|
||
|
||
/// Consumes the WTF-8 string and converts it lossily to UTF-8.
|
||
///
|
||
/// This does not copy the data (but may overwrite parts of it in place).
|
||
///
|
||
/// Surrogates are replaced with `"\u{FFFD}"` (the replacement character “<>”)
|
||
pub fn into_string_lossy(mut self) -> String {
|
||
let mut pos = 0;
|
||
loop {
|
||
match self.next_surrogate(pos) {
|
||
Some((surrogate_pos, _)) => {
|
||
pos = surrogate_pos + 3;
|
||
self.bytes[surrogate_pos..pos]
|
||
.copy_from_slice(UTF8_REPLACEMENT_CHARACTER.as_bytes());
|
||
}
|
||
None => return unsafe { String::from_utf8_unchecked(self.bytes) },
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Converts this `Wtf8Buf` into a boxed `Wtf8`.
|
||
#[inline]
|
||
pub fn into_box(self) -> Box<Wtf8> {
|
||
unsafe { mem::transmute(self.bytes.into_boxed_slice()) }
|
||
}
|
||
|
||
/// Converts a `Box<Wtf8>` into a `Wtf8Buf`.
|
||
pub fn from_box(boxed: Box<Wtf8>) -> Wtf8Buf {
|
||
let bytes: Box<[u8]> = unsafe { mem::transmute(boxed) };
|
||
Wtf8Buf { bytes: bytes.into_vec() }
|
||
}
|
||
}
|
||
|
||
/// Creates a new WTF-8 string from an iterator of code points.
|
||
///
|
||
/// This replaces surrogate code point pairs with supplementary code points,
|
||
/// like concatenating ill-formed UTF-16 strings effectively would.
|
||
impl FromIterator<CodePoint> for Wtf8Buf {
|
||
fn from_iter<T: IntoIterator<Item = CodePoint>>(iter: T) -> Wtf8Buf {
|
||
let mut string = Wtf8Buf::new();
|
||
string.extend(iter);
|
||
string
|
||
}
|
||
}
|
||
|
||
/// Append code points from an iterator to the string.
|
||
///
|
||
/// This replaces surrogate code point pairs with supplementary code points,
|
||
/// like concatenating ill-formed UTF-16 strings effectively would.
|
||
impl Extend<CodePoint> for Wtf8Buf {
|
||
fn extend<T: IntoIterator<Item = CodePoint>>(&mut self, iter: T) {
|
||
let iterator = iter.into_iter();
|
||
let (low, _high) = iterator.size_hint();
|
||
// Lower bound of one byte per code point (ASCII only)
|
||
self.bytes.reserve(low);
|
||
iterator.for_each(move |code_point| self.push(code_point));
|
||
}
|
||
}
|
||
|
||
/// A borrowed slice of well-formed WTF-8 data.
|
||
///
|
||
/// Similar to `&str`, but can additionally contain surrogate code points
|
||
/// if they’re not in a surrogate pair.
|
||
#[derive(Eq, Ord, PartialEq, PartialOrd)]
|
||
pub struct Wtf8 {
|
||
bytes: [u8],
|
||
}
|
||
|
||
impl AsInner<[u8]> for Wtf8 {
|
||
fn as_inner(&self) -> &[u8] {
|
||
&self.bytes
|
||
}
|
||
}
|
||
|
||
/// Format the slice with double quotes,
|
||
/// and surrogates as `\u` followed by four hexadecimal digits.
|
||
/// Example: `"a\u{D800}"` for a slice with code points [U+0061, U+D800]
|
||
impl fmt::Debug for Wtf8 {
|
||
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
fn write_str_escaped(f: &mut fmt::Formatter<'_>, s: &str) -> fmt::Result {
|
||
use crate::fmt::Write;
|
||
for c in s.chars().flat_map(|c| c.escape_debug()) {
|
||
f.write_char(c)?
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
formatter.write_str("\"")?;
|
||
let mut pos = 0;
|
||
while let Some((surrogate_pos, surrogate)) = self.next_surrogate(pos) {
|
||
write_str_escaped(formatter, unsafe {
|
||
str::from_utf8_unchecked(&self.bytes[pos..surrogate_pos])
|
||
})?;
|
||
write!(formatter, "\\u{{{:x}}}", surrogate)?;
|
||
pos = surrogate_pos + 3;
|
||
}
|
||
write_str_escaped(formatter, unsafe { str::from_utf8_unchecked(&self.bytes[pos..]) })?;
|
||
formatter.write_str("\"")
|
||
}
|
||
}
|
||
|
||
impl fmt::Display for Wtf8 {
|
||
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
let wtf8_bytes = &self.bytes;
|
||
let mut pos = 0;
|
||
loop {
|
||
match self.next_surrogate(pos) {
|
||
Some((surrogate_pos, _)) => {
|
||
formatter.write_str(unsafe {
|
||
str::from_utf8_unchecked(&wtf8_bytes[pos..surrogate_pos])
|
||
})?;
|
||
formatter.write_str(UTF8_REPLACEMENT_CHARACTER)?;
|
||
pos = surrogate_pos + 3;
|
||
}
|
||
None => {
|
||
let s = unsafe { str::from_utf8_unchecked(&wtf8_bytes[pos..]) };
|
||
if pos == 0 { return s.fmt(formatter) } else { return formatter.write_str(s) }
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Wtf8 {
|
||
/// Creates a WTF-8 slice from a UTF-8 `&str` slice.
|
||
///
|
||
/// Since WTF-8 is a superset of UTF-8, this always succeeds.
|
||
#[inline]
|
||
pub fn from_str(value: &str) -> &Wtf8 {
|
||
unsafe { Wtf8::from_bytes_unchecked(value.as_bytes()) }
|
||
}
|
||
|
||
/// Creates a WTF-8 slice from a WTF-8 byte slice.
|
||
///
|
||
/// Since the byte slice is not checked for valid WTF-8, this functions is
|
||
/// marked unsafe.
|
||
#[inline]
|
||
unsafe fn from_bytes_unchecked(value: &[u8]) -> &Wtf8 {
|
||
mem::transmute(value)
|
||
}
|
||
|
||
/// Creates a mutable WTF-8 slice from a mutable WTF-8 byte slice.
|
||
///
|
||
/// Since the byte slice is not checked for valid WTF-8, this functions is
|
||
/// marked unsafe.
|
||
#[inline]
|
||
unsafe fn from_mut_bytes_unchecked(value: &mut [u8]) -> &mut Wtf8 {
|
||
mem::transmute(value)
|
||
}
|
||
|
||
/// Returns the length, in WTF-8 bytes.
|
||
#[inline]
|
||
pub fn len(&self) -> usize {
|
||
self.bytes.len()
|
||
}
|
||
|
||
#[inline]
|
||
pub fn is_empty(&self) -> bool {
|
||
self.bytes.is_empty()
|
||
}
|
||
|
||
/// Returns the code point at `position` if it is in the ASCII range,
|
||
/// or `b'\xFF' otherwise.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if `position` is beyond the end of the string.
|
||
#[inline]
|
||
pub fn ascii_byte_at(&self, position: usize) -> u8 {
|
||
match self.bytes[position] {
|
||
ascii_byte @ 0x00..=0x7F => ascii_byte,
|
||
_ => 0xFF,
|
||
}
|
||
}
|
||
|
||
/// Returns an iterator for the string’s code points.
|
||
#[inline]
|
||
pub fn code_points(&self) -> Wtf8CodePoints<'_> {
|
||
Wtf8CodePoints { bytes: self.bytes.iter() }
|
||
}
|
||
|
||
/// Tries to convert the string to UTF-8 and return a `&str` slice.
|
||
///
|
||
/// Returns `None` if the string contains surrogates.
|
||
///
|
||
/// This does not copy the data.
|
||
#[inline]
|
||
pub fn as_str(&self) -> Option<&str> {
|
||
// Well-formed WTF-8 is also well-formed UTF-8
|
||
// if and only if it contains no surrogate.
|
||
match self.next_surrogate(0) {
|
||
None => Some(unsafe { str::from_utf8_unchecked(&self.bytes) }),
|
||
Some(_) => None,
|
||
}
|
||
}
|
||
|
||
/// Lossily converts the string to UTF-8.
|
||
/// Returns a UTF-8 `&str` slice if the contents are well-formed in UTF-8.
|
||
///
|
||
/// Surrogates are replaced with `"\u{FFFD}"` (the replacement character “<>”).
|
||
///
|
||
/// This only copies the data if necessary (if it contains any surrogate).
|
||
pub fn to_string_lossy(&self) -> Cow<'_, str> {
|
||
let surrogate_pos = match self.next_surrogate(0) {
|
||
None => return Cow::Borrowed(unsafe { str::from_utf8_unchecked(&self.bytes) }),
|
||
Some((pos, _)) => pos,
|
||
};
|
||
let wtf8_bytes = &self.bytes;
|
||
let mut utf8_bytes = Vec::with_capacity(self.len());
|
||
utf8_bytes.extend_from_slice(&wtf8_bytes[..surrogate_pos]);
|
||
utf8_bytes.extend_from_slice(UTF8_REPLACEMENT_CHARACTER.as_bytes());
|
||
let mut pos = surrogate_pos + 3;
|
||
loop {
|
||
match self.next_surrogate(pos) {
|
||
Some((surrogate_pos, _)) => {
|
||
utf8_bytes.extend_from_slice(&wtf8_bytes[pos..surrogate_pos]);
|
||
utf8_bytes.extend_from_slice(UTF8_REPLACEMENT_CHARACTER.as_bytes());
|
||
pos = surrogate_pos + 3;
|
||
}
|
||
None => {
|
||
utf8_bytes.extend_from_slice(&wtf8_bytes[pos..]);
|
||
return Cow::Owned(unsafe { String::from_utf8_unchecked(utf8_bytes) });
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Converts the WTF-8 string to potentially ill-formed UTF-16
|
||
/// and return an iterator of 16-bit code units.
|
||
///
|
||
/// This is lossless:
|
||
/// calling `Wtf8Buf::from_ill_formed_utf16` on the resulting code units
|
||
/// would always return the original WTF-8 string.
|
||
#[inline]
|
||
pub fn encode_wide(&self) -> EncodeWide<'_> {
|
||
EncodeWide { code_points: self.code_points(), extra: 0 }
|
||
}
|
||
|
||
#[inline]
|
||
fn next_surrogate(&self, mut pos: usize) -> Option<(usize, u16)> {
|
||
let mut iter = self.bytes[pos..].iter();
|
||
loop {
|
||
let b = *iter.next()?;
|
||
if b < 0x80 {
|
||
pos += 1;
|
||
} else if b < 0xE0 {
|
||
iter.next();
|
||
pos += 2;
|
||
} else if b == 0xED {
|
||
match (iter.next(), iter.next()) {
|
||
(Some(&b2), Some(&b3)) if b2 >= 0xA0 => {
|
||
return Some((pos, decode_surrogate(b2, b3)));
|
||
}
|
||
_ => pos += 3,
|
||
}
|
||
} else if b < 0xF0 {
|
||
iter.next();
|
||
iter.next();
|
||
pos += 3;
|
||
} else {
|
||
iter.next();
|
||
iter.next();
|
||
iter.next();
|
||
pos += 4;
|
||
}
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn final_lead_surrogate(&self) -> Option<u16> {
|
||
match self.bytes {
|
||
[.., 0xED, b2 @ 0xA0..=0xAF, b3] => Some(decode_surrogate(b2, b3)),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn initial_trail_surrogate(&self) -> Option<u16> {
|
||
match self.bytes {
|
||
[0xED, b2 @ 0xB0..=0xBF, b3, ..] => Some(decode_surrogate(b2, b3)),
|
||
_ => None,
|
||
}
|
||
}
|
||
|
||
pub fn clone_into(&self, buf: &mut Wtf8Buf) {
|
||
self.bytes.clone_into(&mut buf.bytes)
|
||
}
|
||
|
||
/// Boxes this `Wtf8`.
|
||
#[inline]
|
||
pub fn into_box(&self) -> Box<Wtf8> {
|
||
let boxed: Box<[u8]> = self.bytes.into();
|
||
unsafe { mem::transmute(boxed) }
|
||
}
|
||
|
||
/// Creates a boxed, empty `Wtf8`.
|
||
pub fn empty_box() -> Box<Wtf8> {
|
||
let boxed: Box<[u8]> = Default::default();
|
||
unsafe { mem::transmute(boxed) }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn into_arc(&self) -> Arc<Wtf8> {
|
||
let arc: Arc<[u8]> = Arc::from(&self.bytes);
|
||
unsafe { Arc::from_raw(Arc::into_raw(arc) as *const Wtf8) }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn into_rc(&self) -> Rc<Wtf8> {
|
||
let rc: Rc<[u8]> = Rc::from(&self.bytes);
|
||
unsafe { Rc::from_raw(Rc::into_raw(rc) as *const Wtf8) }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn make_ascii_lowercase(&mut self) {
|
||
self.bytes.make_ascii_lowercase()
|
||
}
|
||
|
||
#[inline]
|
||
pub fn make_ascii_uppercase(&mut self) {
|
||
self.bytes.make_ascii_uppercase()
|
||
}
|
||
|
||
#[inline]
|
||
pub fn to_ascii_lowercase(&self) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: self.bytes.to_ascii_lowercase() }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn to_ascii_uppercase(&self) -> Wtf8Buf {
|
||
Wtf8Buf { bytes: self.bytes.to_ascii_uppercase() }
|
||
}
|
||
|
||
#[inline]
|
||
pub fn is_ascii(&self) -> bool {
|
||
self.bytes.is_ascii()
|
||
}
|
||
|
||
#[inline]
|
||
pub fn eq_ignore_ascii_case(&self, other: &Self) -> bool {
|
||
self.bytes.eq_ignore_ascii_case(&other.bytes)
|
||
}
|
||
}
|
||
|
||
/// Returns a slice of the given string for the byte range [`begin`..`end`).
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` and `end` do not point to code point boundaries,
|
||
/// or point beyond the end of the string.
|
||
impl ops::Index<ops::Range<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::Range<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if range.start <= range.end
|
||
&& is_code_point_boundary(self, range.start)
|
||
&& is_code_point_boundary(self, range.end)
|
||
{
|
||
unsafe { slice_unchecked(self, range.start, range.end) }
|
||
} else {
|
||
slice_error_fail(self, range.start, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Returns a slice of the given string from byte `begin` to its end.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `begin` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
impl ops::Index<ops::RangeFrom<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::RangeFrom<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.start) {
|
||
unsafe { slice_unchecked(self, range.start, self.len()) }
|
||
} else {
|
||
slice_error_fail(self, range.start, self.len())
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Returns a slice of the given string from its beginning to byte `end`.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics when `end` is not at a code point boundary,
|
||
/// or is beyond the end of the string.
|
||
impl ops::Index<ops::RangeTo<usize>> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, range: ops::RangeTo<usize>) -> &Wtf8 {
|
||
// is_code_point_boundary checks that the index is in [0, .len()]
|
||
if is_code_point_boundary(self, range.end) {
|
||
unsafe { slice_unchecked(self, 0, range.end) }
|
||
} else {
|
||
slice_error_fail(self, 0, range.end)
|
||
}
|
||
}
|
||
}
|
||
|
||
impl ops::Index<ops::RangeFull> for Wtf8 {
|
||
type Output = Wtf8;
|
||
|
||
#[inline]
|
||
fn index(&self, _range: ops::RangeFull) -> &Wtf8 {
|
||
self
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
fn decode_surrogate(second_byte: u8, third_byte: u8) -> u16 {
|
||
// The first byte is assumed to be 0xED
|
||
0xD800 | (second_byte as u16 & 0x3F) << 6 | third_byte as u16 & 0x3F
|
||
}
|
||
|
||
#[inline]
|
||
fn decode_surrogate_pair(lead: u16, trail: u16) -> char {
|
||
let code_point = 0x10000 + ((((lead - 0xD800) as u32) << 10) | (trail - 0xDC00) as u32);
|
||
unsafe { char::from_u32_unchecked(code_point) }
|
||
}
|
||
|
||
/// Copied from core::str::StrPrelude::is_char_boundary
|
||
#[inline]
|
||
pub fn is_code_point_boundary(slice: &Wtf8, index: usize) -> bool {
|
||
if index == slice.len() {
|
||
return true;
|
||
}
|
||
match slice.bytes.get(index) {
|
||
None => false,
|
||
Some(&b) => b < 128 || b >= 192,
|
||
}
|
||
}
|
||
|
||
/// Copied from core::str::raw::slice_unchecked
|
||
#[inline]
|
||
pub unsafe fn slice_unchecked(s: &Wtf8, begin: usize, end: usize) -> &Wtf8 {
|
||
// memory layout of an &[u8] and &Wtf8 are the same
|
||
Wtf8::from_bytes_unchecked(slice::from_raw_parts(s.bytes.as_ptr().add(begin), end - begin))
|
||
}
|
||
|
||
/// Copied from core::str::raw::slice_error_fail
|
||
#[inline(never)]
|
||
pub fn slice_error_fail(s: &Wtf8, begin: usize, end: usize) -> ! {
|
||
assert!(begin <= end);
|
||
panic!("index {} and/or {} in `{:?}` do not lie on character boundary", begin, end, s);
|
||
}
|
||
|
||
/// Iterator for the code points of a WTF-8 string.
|
||
///
|
||
/// Created with the method `.code_points()`.
|
||
#[derive(Clone)]
|
||
pub struct Wtf8CodePoints<'a> {
|
||
bytes: slice::Iter<'a, u8>,
|
||
}
|
||
|
||
impl<'a> Iterator for Wtf8CodePoints<'a> {
|
||
type Item = CodePoint;
|
||
|
||
#[inline]
|
||
fn next(&mut self) -> Option<CodePoint> {
|
||
next_code_point(&mut self.bytes).map(|c| CodePoint { value: c })
|
||
}
|
||
|
||
#[inline]
|
||
fn size_hint(&self) -> (usize, Option<usize>) {
|
||
let len = self.bytes.len();
|
||
(len.saturating_add(3) / 4, Some(len))
|
||
}
|
||
}
|
||
|
||
/// Generates a wide character sequence for potentially ill-formed UTF-16.
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[derive(Clone)]
|
||
pub struct EncodeWide<'a> {
|
||
code_points: Wtf8CodePoints<'a>,
|
||
extra: u16,
|
||
}
|
||
|
||
// Copied from libunicode/u_str.rs
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
impl<'a> Iterator for EncodeWide<'a> {
|
||
type Item = u16;
|
||
|
||
#[inline]
|
||
fn next(&mut self) -> Option<u16> {
|
||
if self.extra != 0 {
|
||
let tmp = self.extra;
|
||
self.extra = 0;
|
||
return Some(tmp);
|
||
}
|
||
|
||
let mut buf = [0; 2];
|
||
self.code_points.next().map(|code_point| {
|
||
let c = unsafe { char::from_u32_unchecked(code_point.value) };
|
||
let n = c.encode_utf16(&mut buf).len();
|
||
if n == 2 {
|
||
self.extra = buf[1];
|
||
}
|
||
buf[0]
|
||
})
|
||
}
|
||
|
||
#[inline]
|
||
fn size_hint(&self) -> (usize, Option<usize>) {
|
||
let (low, high) = self.code_points.size_hint();
|
||
// every code point gets either one u16 or two u16,
|
||
// so this iterator is between 1 or 2 times as
|
||
// long as the underlying iterator.
|
||
(low, high.and_then(|n| n.checked_mul(2)))
|
||
}
|
||
}
|
||
|
||
impl Hash for CodePoint {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
self.value.hash(state)
|
||
}
|
||
}
|
||
|
||
impl Hash for Wtf8Buf {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
state.write(&self.bytes);
|
||
0xfeu8.hash(state)
|
||
}
|
||
}
|
||
|
||
impl Hash for Wtf8 {
|
||
#[inline]
|
||
fn hash<H: Hasher>(&self, state: &mut H) {
|
||
state.write(&self.bytes);
|
||
0xfeu8.hash(state)
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
use crate::borrow::Cow;
|
||
|
||
#[test]
|
||
fn code_point_from_u32() {
|
||
assert!(CodePoint::from_u32(0).is_some());
|
||
assert!(CodePoint::from_u32(0xD800).is_some());
|
||
assert!(CodePoint::from_u32(0x10FFFF).is_some());
|
||
assert!(CodePoint::from_u32(0x110000).is_none());
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_u32() {
|
||
fn c(value: u32) -> CodePoint {
|
||
CodePoint::from_u32(value).unwrap()
|
||
}
|
||
assert_eq!(c(0).to_u32(), 0);
|
||
assert_eq!(c(0xD800).to_u32(), 0xD800);
|
||
assert_eq!(c(0x10FFFF).to_u32(), 0x10FFFF);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_from_char() {
|
||
assert_eq!(CodePoint::from_char('a').to_u32(), 0x61);
|
||
assert_eq!(CodePoint::from_char('💩').to_u32(), 0x1F4A9);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_string() {
|
||
assert_eq!(format!("{:?}", CodePoint::from_char('a')), "U+0061");
|
||
assert_eq!(format!("{:?}", CodePoint::from_char('💩')), "U+1F4A9");
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_char() {
|
||
fn c(value: u32) -> CodePoint {
|
||
CodePoint::from_u32(value).unwrap()
|
||
}
|
||
assert_eq!(c(0x61).to_char(), Some('a'));
|
||
assert_eq!(c(0x1F4A9).to_char(), Some('💩'));
|
||
assert_eq!(c(0xD800).to_char(), None);
|
||
}
|
||
|
||
#[test]
|
||
fn code_point_to_char_lossy() {
|
||
fn c(value: u32) -> CodePoint {
|
||
CodePoint::from_u32(value).unwrap()
|
||
}
|
||
assert_eq!(c(0x61).to_char_lossy(), 'a');
|
||
assert_eq!(c(0x1F4A9).to_char_lossy(), '💩');
|
||
assert_eq!(c(0xD800).to_char_lossy(), '\u{FFFD}');
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_new() {
|
||
assert_eq!(Wtf8Buf::new().bytes, b"");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_str() {
|
||
assert_eq!(Wtf8Buf::from_str("").bytes, b"");
|
||
assert_eq!(Wtf8Buf::from_str("aé 💩").bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_string() {
|
||
assert_eq!(Wtf8Buf::from_string(String::from("")).bytes, b"");
|
||
assert_eq!(
|
||
Wtf8Buf::from_string(String::from("aé 💩")).bytes,
|
||
b"a\xC3\xA9 \xF0\x9F\x92\xA9"
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_wide() {
|
||
assert_eq!(Wtf8Buf::from_wide(&[]).bytes, b"");
|
||
assert_eq!(
|
||
Wtf8Buf::from_wide(&[0x61, 0xE9, 0x20, 0xD83D, 0xD83D, 0xDCA9]).bytes,
|
||
b"a\xC3\xA9 \xED\xA0\xBD\xF0\x9F\x92\xA9"
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_str() {
|
||
let mut string = Wtf8Buf::new();
|
||
assert_eq!(string.bytes, b"");
|
||
string.push_str("aé 💩");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_char() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 ");
|
||
string.push_char('💩');
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 ");
|
||
string.push(CodePoint::from_char('💩'));
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
fn c(value: u32) -> CodePoint {
|
||
CodePoint::from_u32(value).unwrap()
|
||
}
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD83D)); // lead
|
||
string.push(c(0xDCA9)); // trail
|
||
assert_eq!(string.bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD83D)); // lead
|
||
string.push(c(0x20)); // not surrogate
|
||
string.push(c(0xDCA9)); // trail
|
||
assert_eq!(string.bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD800)); // lead
|
||
string.push(c(0xDBFF)); // lead
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD800)); // lead
|
||
string.push(c(0xE000)); // not surrogate
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xD7FF)); // not surrogate
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0x61)); // not surrogate, < 3 bytes
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\x61\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(c(0xDC00)); // trail
|
||
assert_eq!(string.bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_push_wtf8() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
assert_eq!(string.bytes, b"a\xC3\xA9");
|
||
string.push_wtf8(Wtf8::from_str(" 💩"));
|
||
assert_eq!(string.bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
fn w(v: &[u8]) -> &Wtf8 {
|
||
unsafe { Wtf8::from_bytes_unchecked(v) }
|
||
}
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\xBD")); // lead
|
||
string.push_wtf8(w(b"\xED\xB2\xA9")); // trail
|
||
assert_eq!(string.bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\xBD")); // lead
|
||
string.push_wtf8(w(b" ")); // not surrogate
|
||
string.push_wtf8(w(b"\xED\xB2\xA9")); // trail
|
||
assert_eq!(string.bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\x80")); // lead
|
||
string.push_wtf8(w(b"\xED\xAF\xBF")); // lead
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xA0\x80")); // lead
|
||
string.push_wtf8(w(b"\xEE\x80\x80")); // not surrogate
|
||
assert_eq!(string.bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\x9F\xBF")); // not surrogate
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"a")); // not surrogate, < 3 bytes
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\x61\xED\xB0\x80");
|
||
|
||
let mut string = Wtf8Buf::new();
|
||
string.push_wtf8(w(b"\xED\xB0\x80")); // trail
|
||
assert_eq!(string.bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_truncate() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(1);
|
||
assert_eq!(string.bytes, b"a");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8buf_truncate_fail_code_point_boundary() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(2);
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8buf_truncate_fail_longer() {
|
||
let mut string = Wtf8Buf::from_str("aé");
|
||
string.truncate(4);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_into_string() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
assert_eq!(string.clone().into_string(), Ok(String::from("aé 💩")));
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.clone().into_string(), Err(string));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_into_string_lossy() {
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
assert_eq!(string.clone().into_string_lossy(), String::from("aé 💩"));
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.clone().into_string_lossy(), String::from("aé 💩<>"));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_from_iterator() {
|
||
fn f(values: &[u32]) -> Wtf8Buf {
|
||
values.iter().map(|&c| CodePoint::from_u32(c).unwrap()).collect::<Wtf8Buf>()
|
||
}
|
||
assert_eq!(f(&[0x61, 0xE9, 0x20, 0x1F4A9]).bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
assert_eq!(f(&[0xD83D, 0xDCA9]).bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
assert_eq!(f(&[0xD83D, 0x20, 0xDCA9]).bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
assert_eq!(f(&[0xD800, 0xDBFF]).bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
assert_eq!(f(&[0xD800, 0xE000]).bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
assert_eq!(f(&[0xD7FF, 0xDC00]).bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
assert_eq!(f(&[0x61, 0xDC00]).bytes, b"\x61\xED\xB0\x80");
|
||
assert_eq!(f(&[0xDC00]).bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_extend() {
|
||
fn e(initial: &[u32], extended: &[u32]) -> Wtf8Buf {
|
||
fn c(value: &u32) -> CodePoint {
|
||
CodePoint::from_u32(*value).unwrap()
|
||
}
|
||
let mut string = initial.iter().map(c).collect::<Wtf8Buf>();
|
||
string.extend(extended.iter().map(c));
|
||
string
|
||
}
|
||
|
||
assert_eq!(e(&[0x61, 0xE9], &[0x20, 0x1F4A9]).bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
|
||
assert_eq!(e(&[0xD83D], &[0xDCA9]).bytes, b"\xF0\x9F\x92\xA9"); // Magic!
|
||
assert_eq!(e(&[0xD83D, 0x20], &[0xDCA9]).bytes, b"\xED\xA0\xBD \xED\xB2\xA9");
|
||
assert_eq!(e(&[0xD800], &[0xDBFF]).bytes, b"\xED\xA0\x80\xED\xAF\xBF");
|
||
assert_eq!(e(&[0xD800], &[0xE000]).bytes, b"\xED\xA0\x80\xEE\x80\x80");
|
||
assert_eq!(e(&[0xD7FF], &[0xDC00]).bytes, b"\xED\x9F\xBF\xED\xB0\x80");
|
||
assert_eq!(e(&[0x61], &[0xDC00]).bytes, b"\x61\xED\xB0\x80");
|
||
assert_eq!(e(&[], &[0xDC00]).bytes, b"\xED\xB0\x80");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_show() {
|
||
let mut string = Wtf8Buf::from_str("a\té \u{7f}💩\r");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(format!("{:?}", string), "\"a\\té \\u{7f}\u{1f4a9}\\r\\u{d800}\"");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_as_slice() {
|
||
assert_eq!(Wtf8Buf::from_str("aé").as_slice(), Wtf8::from_str("aé"));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8buf_show_str() {
|
||
let text = "a\té 💩\r";
|
||
let string = Wtf8Buf::from_str(text);
|
||
assert_eq!(format!("{:?}", text), format!("{:?}", string));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_from_str() {
|
||
assert_eq!(&Wtf8::from_str("").bytes, b"");
|
||
assert_eq!(&Wtf8::from_str("aé 💩").bytes, b"a\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_len() {
|
||
assert_eq!(Wtf8::from_str("").len(), 0);
|
||
assert_eq!(Wtf8::from_str("aé 💩").len(), 8);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[1..4].bytes, b"\xC3\xA9 ");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[2..4];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice_from() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[1..].bytes, b"\xC3\xA9 \xF0\x9F\x92\xA9");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_from_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[2..];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_slice_to() {
|
||
assert_eq!(&Wtf8::from_str("aé 💩")[..4].bytes, b"a\xC3\xA9 ");
|
||
}
|
||
|
||
#[test]
|
||
#[should_panic]
|
||
fn wtf8_slice_to_not_code_point_boundary() {
|
||
&Wtf8::from_str("aé 💩")[5..];
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_ascii_byte_at() {
|
||
let slice = Wtf8::from_str("aé 💩");
|
||
assert_eq!(slice.ascii_byte_at(0), b'a');
|
||
assert_eq!(slice.ascii_byte_at(1), b'\xFF');
|
||
assert_eq!(slice.ascii_byte_at(2), b'\xFF');
|
||
assert_eq!(slice.ascii_byte_at(3), b' ');
|
||
assert_eq!(slice.ascii_byte_at(4), b'\xFF');
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_code_points() {
|
||
fn c(value: u32) -> CodePoint {
|
||
CodePoint::from_u32(value).unwrap()
|
||
}
|
||
fn cp(string: &Wtf8Buf) -> Vec<Option<char>> {
|
||
string.code_points().map(|c| c.to_char()).collect::<Vec<_>>()
|
||
}
|
||
let mut string = Wtf8Buf::from_str("é ");
|
||
assert_eq!(cp(&string), [Some('é'), Some(' ')]);
|
||
string.push(c(0xD83D));
|
||
assert_eq!(cp(&string), [Some('é'), Some(' '), None]);
|
||
string.push(c(0xDCA9));
|
||
assert_eq!(cp(&string), [Some('é'), Some(' '), Some('💩')]);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_as_str() {
|
||
assert_eq!(Wtf8::from_str("").as_str(), Some(""));
|
||
assert_eq!(Wtf8::from_str("aé 💩").as_str(), Some("aé 💩"));
|
||
let mut string = Wtf8Buf::new();
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!(string.as_str(), None);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_to_string_lossy() {
|
||
assert_eq!(Wtf8::from_str("").to_string_lossy(), Cow::Borrowed(""));
|
||
assert_eq!(Wtf8::from_str("aé 💩").to_string_lossy(), Cow::Borrowed("aé 💩"));
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
let expected: Cow<'_, str> = Cow::Owned(String::from("aé 💩<>"));
|
||
assert_eq!(string.to_string_lossy(), expected);
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_display() {
|
||
fn d(b: &[u8]) -> String {
|
||
(&unsafe { Wtf8::from_bytes_unchecked(b) }).to_string()
|
||
}
|
||
|
||
assert_eq!("", d("".as_bytes()));
|
||
assert_eq!("aé 💩", d("aé 💩".as_bytes()));
|
||
|
||
let mut string = Wtf8Buf::from_str("aé 💩");
|
||
string.push(CodePoint::from_u32(0xD800).unwrap());
|
||
assert_eq!("aé 💩<>", d(string.as_inner()));
|
||
}
|
||
|
||
#[test]
|
||
fn wtf8_encode_wide() {
|
||
let mut string = Wtf8Buf::from_str("aé ");
|
||
string.push(CodePoint::from_u32(0xD83D).unwrap());
|
||
string.push_char('💩');
|
||
assert_eq!(
|
||
string.encode_wide().collect::<Vec<_>>(),
|
||
vec![0x61, 0xE9, 0x20, 0xD83D, 0xD83D, 0xDCA9]
|
||
);
|
||
}
|
||
}
|