forked from model-checking/verify-rust-std
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Rollup merge of rust-lang#120314 - mina86:i, r=Mark-Simulacrum
core: optimise Debug impl for ascii::Char Rather than writing character at a time, optimise Debug implementation for core::ascii::Char such that it writes the entire representation with a single write_str call. With that, add tests for Display and Debug. Issue: rust-lang#110998
- Loading branch information
Showing
3 changed files
with
42 additions
and
19 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,28 @@ | ||
use core::ascii::Char; | ||
use core::fmt::Write; | ||
|
||
/// Tests Display implementation for ascii::Char. | ||
#[test] | ||
fn test_display() { | ||
let want = (0..128u8).map(|b| b as char).collect::<String>(); | ||
let mut got = String::with_capacity(128); | ||
for byte in 0..128 { | ||
write!(&mut got, "{}", Char::from_u8(byte).unwrap()).unwrap(); | ||
} | ||
assert_eq!(want, got); | ||
} | ||
|
||
/// Tests Debug implementation for ascii::Char. | ||
#[test] | ||
fn test_debug_control() { | ||
for byte in 0..128u8 { | ||
let mut want = format!("{:?}", byte as char); | ||
// `char` uses `'\u{#}'` representation where ascii::char uses `'\x##'`. | ||
// Transform former into the latter. | ||
if let Some(rest) = want.strip_prefix("'\\u{") { | ||
want = format!("'\\x{:0>2}'", rest.strip_suffix("}'").unwrap()); | ||
} | ||
let chr = core::ascii::Char::from_u8(byte).unwrap(); | ||
assert_eq!(want, format!("{chr:?}"), "byte: {byte}"); | ||
} | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters