// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at:
https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use crate::*;
use core::fmt;
macro_rules! impl_write_num {
($u:ty, $i:ty, $test:ident) => {
impl $crate::Writeable for $u {
fn write_to<W: core::fmt::Write + ?Sized>(&self, sink: &mut W) -> core::fmt::Result {
const MAX_LEN: usize = <$u>::MAX.ilog10() as usize + 1;
let mut buf = [b'0'; MAX_LEN];
let mut n = *self;
let mut i = MAX_LEN;
#[allow(clippy::indexing_slicing)] // n < 10^i
while n != 0 {
i -= 1;
buf[i] = b'0' + (n % 10) as u8;
n /= 10;
}
if i == MAX_LEN {
debug_assert_eq!(*self, 0);
i -= 1;
}
#[allow(clippy::indexing_slicing)] // buf is ASCII
let s = unsafe { core::str::from_utf8_unchecked(&buf[i..]) };
sink.write_str(s)
}
fn writeable_length_hint(&self) -> $crate::LengthHint {
LengthHint::exact(self.checked_ilog10().unwrap_or(0) as usize + 1)
}
}
impl $crate::Writeable for $i {
fn write_to<W: core::fmt::Write + ?Sized>(&self, sink: &mut W) -> core::fmt::Result {
if self.is_negative() {
sink.write_str("-")?;
}
self.unsigned_abs().write_to(sink)
}
fn writeable_length_hint(&self) -> $crate::LengthHint {
$crate::LengthHint::exact(if self.is_negative() { 1 } else { 0 })
+ self.unsigned_abs().writeable_length_hint()
}
}
#[test]
fn $test() {
use $crate::assert_writeable_eq;
assert_writeable_eq!(&(0 as $u), "0");
assert_writeable_eq!(&(0 as $i), "0");
assert_writeable_eq!(&(-0 as $i), "0");
assert_writeable_eq!(&(1 as $u), "1");
assert_writeable_eq!(&(1 as $i), "1");
assert_writeable_eq!(&(-1 as $i), "-1");
assert_writeable_eq!(&(9 as $u), "9");
assert_writeable_eq!(&(9 as $i), "9");
assert_writeable_eq!(&(-9 as $i), "-9");
assert_writeable_eq!(&(10 as $u), "10");
assert_writeable_eq!(&(10 as $i), "10");
assert_writeable_eq!(&(-10 as $i), "-10");
assert_writeable_eq!(&(99 as $u), "99");
assert_writeable_eq!(&(99 as $i), "99");
assert_writeable_eq!(&(-99 as $i), "-99");
assert_writeable_eq!(&(100 as $u), "100");
assert_writeable_eq!(&(-100 as $i), "-100");
assert_writeable_eq!(&<$u>::MAX, <$u>::MAX.to_string());
assert_writeable_eq!(&<$i>::MAX, <$i>::MAX.to_string());
assert_writeable_eq!(&<$i>::MIN, <$i>::MIN.to_string());
use rand::{rngs::SmallRng, Rng, SeedableRng};
let mut rng = SmallRng::seed_from_u64(4); // chosen by fair dice roll.
// guaranteed to be random.
for _ in 0..1000 {
let rand = rng.gen::<$u>();
assert_writeable_eq!(rand, rand.to_string());
}
}
};
}
impl_write_num!(u8, i8, test_u8);
impl_write_num!(u16, i16, test_u16);
impl_write_num!(u32, i32, test_u32);
impl_write_num!(u64, i64, test_u64);
impl_write_num!(u128, i128, test_u128);
impl_write_num!(usize, isize, test_usize);
impl Writeable for str {
#[inline]
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
sink.write_str(self)
}
#[inline]
fn writeable_length_hint(&self) -> LengthHint {
LengthHint::exact(self.len())
}
/// Returns a borrowed `str`.
///
/// # Examples
///
/// ```
/// use std::borrow::Cow;
/// use writeable::Writeable;
///
/// let cow = "foo".write_to_string();
/// assert!(matches!(cow, Cow::Borrowed(_)));
/// ```
#[inline]
fn write_to_string(&self) -> Cow<str> {
Cow::Borrowed(self)
}
#[inline]
fn writeable_cmp_bytes(&self, other: &[u8]) -> core::cmp::Ordering {
self.as_bytes().cmp(other)
}
}
impl Writeable for String {
#[inline]
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
sink.write_str(self)
}
#[inline]
fn writeable_length_hint(&self) -> LengthHint {
LengthHint::exact(self.len())
}
#[inline]
fn write_to_string(&self) -> Cow<str> {
Cow::Borrowed(self)
}
#[inline]
fn writeable_cmp_bytes(&self, other: &[u8]) -> core::cmp::Ordering {
self.as_bytes().cmp(other)
}
}
impl Writeable for char {
#[inline]
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
sink.write_char(*self)
}
#[inline]
fn writeable_length_hint(&self) -> LengthHint {
LengthHint::exact(self.len_utf8())
}
#[inline]
fn write_to_string(&self) -> Cow<str> {
let mut s = String::with_capacity(self.len_utf8());
s.push(*self);
Cow::Owned(s)
}
#[inline]
fn writeable_cmp_bytes(&self, other: &[u8]) -> core::cmp::Ordering {
self.encode_utf8(&mut [0u8; 4]).as_bytes().cmp(other)
}
}
impl<T: Writeable + ?Sized> Writeable for &T {
#[inline]
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
(*self).write_to(sink)
}
#[inline]
fn write_to_parts<W: PartsWrite + ?Sized>(&self, sink: &mut W) -> fmt::Result {
(*self).write_to_parts(sink)
}
#[inline]
fn writeable_length_hint(&self) -> LengthHint {
(*self).writeable_length_hint()
}
#[inline]
fn write_to_string(&self) -> Cow<str> {
(*self).write_to_string()
}
#[inline]
fn writeable_cmp_bytes(&self, other: &[u8]) -> core::cmp::Ordering {
(*self).writeable_cmp_bytes(other)
}
}
macro_rules! impl_write_smart_pointer {
($ty:path, T: $extra_bound:path) => {
impl<'a, T: ?Sized + Writeable + $extra_bound> Writeable for $ty {
#[inline]
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
core::borrow::Borrow::<T>::borrow(self).write_to(sink)
}
#[inline]
fn write_to_parts<W: PartsWrite + ?Sized>(&self, sink: &mut W) -> fmt::Result {
core::borrow::Borrow::<T>::borrow(self).write_to_parts(sink)
}
#[inline]
fn writeable_length_hint(&self) -> LengthHint {
core::borrow::Borrow::<T>::borrow(self).writeable_length_hint()
}
#[inline]
fn write_to_string(&self) -> Cow<str> {
core::borrow::Borrow::<T>::borrow(self).write_to_string()
}
#[inline]
fn writeable_cmp_bytes(&self, other: &[u8]) -> core::cmp::Ordering {
core::borrow::Borrow::<T>::borrow(self).writeable_cmp_bytes(other)
}
}
};
($ty:path) => {
// Add a harmless duplicate Writeable bound
impl_write_smart_pointer!($ty, T: Writeable);
};
}
impl_write_smart_pointer!(Cow<'a, T>, T: alloc::borrow::ToOwned);
impl_write_smart_pointer!(alloc::boxed::Box<T>);
impl_write_smart_pointer!(alloc::rc::Rc<T>);
impl_write_smart_pointer!(alloc::sync::Arc<T>);
#[test]
fn test_string_impls() {
fn check_writeable_slice<W: Writeable + core::fmt::Display>(writeables: &[W]) {
assert_writeable_eq!(&writeables[0], "");
assert_writeable_eq!(&writeables[1], "abc");
assert!(matches!(writeables[0].write_to_string(), Cow::Borrowed(_)));
assert!(matches!(writeables[1].write_to_string(), Cow::Borrowed(_)));
}
// test str impl
let arr: &[&str] = &["", "abc"];
check_writeable_slice(arr);
// test String impl
let arr: &[String] = &[String::new(), "abc".to_owned()];
check_writeable_slice(arr);
// test char impl
let chars = ['a', 'β', '你', '��'];
for i in 0..chars.len() {
let s = String::from(chars[i]);
assert_writeable_eq!(&chars[i], s);
for j in 0..chars.len() {
assert_eq!(
chars[j].writeable_cmp_bytes(s.as_bytes()),
chars[j].cmp(&chars[i]),
"{:?} vs {:?}",
chars[j],
chars[i]
);
}
}
// test Cow impl
let arr: &[Cow<str>] = &[Cow::Borrowed(""), Cow::Owned("abc".to_string())];
check_writeable_slice(arr);
// test Box impl
let arr: &[Box<str>] = &["".into(), "abc".into()];
check_writeable_slice(arr);
// test Rc impl
let arr: &[alloc::rc::Rc<str>] = &["".into(), "abc".into()];
check_writeable_slice(arr);
// test Arc impl
let arr: &[alloc::sync::Arc<str>] = &["".into(), "abc".into()];
check_writeable_slice(arr);
// test &T impl
let arr: &[&String] = &[&String::new(), &"abc".to_owned()];
check_writeable_slice(arr);
}
