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Auto merge of #132500 - RalfJung:char-is-whitespace-const, r=jhpratt

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make char::is_whitespace unstably const

I am adding this to the existing https://github.com/rust-lang/rust/issues/132241 feature gate, since `is_digit` and `is_whitespace` seem similar enough that one can group them together.
This commit is contained in:
bors 2024-11-06 04:07:32 +00:00
commit cf2b370ad0
3 changed files with 5 additions and 4 deletions
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5
library/core/src/char/methods.rs
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@ -320,7 +320,7 @@ pub const fn from_digit(num: u32, radix: u32) -> Option<char> {
/// '1'.is_digit(37);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_char_is_digit", issue = "132241")]
#[rustc_const_unstable(feature = "const_char_classify", issue = "132241")]
#[inline]
pub const fn is_digit(self, radix: u32) -> bool {
self.to_digit(radix).is_some()
@ -856,8 +856,9 @@ pub const fn is_uppercase(self) -> bool {
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_char_classify", issue = "132241")]
#[inline]
pub fn is_whitespace(self) -> bool {
pub const fn is_whitespace(self) -> bool {
match self {
' ' | '\x09'..='\x0d' => true,
c => c > '\x7f' && unicode::White_Space(c),

2
library/core/src/unicode/unicode_data.rs
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@ -572,7 +572,7 @@ pub mod white_space {
0, 0, 0, 0, 0, 0, 0, 0, 0,
];
#[inline]
pub fn lookup(c: char) -> bool {
pub const fn lookup(c: char) -> bool {
match c as u32 >> 8 {
0 => WHITESPACE_MAP[c as usize & 0xff] & 1 != 0,
22 => c as u32 == 0x1680,

2
src/tools/unicode-table-generator/src/cascading_map.rs
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@ -65,7 +65,7 @@ pub fn emit_cascading_map(&mut self, ranges: &[Range<u32>]) -> bool {
self.bytes_used += 256;
writeln!(&mut self.file, "#[inline]").unwrap();
writeln!(&mut self.file, "pub fn lookup(c: char) -> bool {{").unwrap();
writeln!(&mut self.file, "pub const fn lookup(c: char) -> bool {{").unwrap();
writeln!(&mut self.file, " match c as u32 >> 8 {{").unwrap();
for arm in arms {
writeln!(&mut self.file, " {},", arm).unwrap();