Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 178 insertions, 0 deletions

diff --git a/third_party/rust/writeable/src/impls.rs b/third_party/rust/writeable/src/impls.rs
new file mode 100644
index 0000000000..a1410fb948
--- /dev/null
+++ b/third_party/rust/writeable/src/impls.rs
@@ -0,0 +1,178 @@
+// 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 alloc::borrow::Cow;
+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)
+    }
+}
+
+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)
+    }
+}
+
+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()
+    }
+}
+
+#[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");
+    }
+
+    // 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 &T impl
+    let arr: &[&String] = &[&String::new(), &"abc".to_owned()];
+    check_writeable_slice(arr);
+}