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add more docs regarding ideographic numbers

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Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
This commit is contained in:
Vincenzo Palazzo 2022-07-22 22:48:45 +00:00
parent 05e678ccca
commit 47a0a56c1d
1 changed files with 11 additions and 1 deletions
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12
library/core/src/char/methods.rs
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@ -892,7 +892,16 @@ impl char {
///
/// The general categories for numbers (`Nd` for decimal digits, `Nl` for letter-like numeric
/// characters, and `No` for other numeric characters) are specified in the [Unicode Character
/// Database][ucd] [`UnicodeData.txt`].
/// Database][ucd] [`UnicodeData.txt`]. Note that this means ideographic numbers like '三'
/// are considered alphabetic, not numeric. Please consider to use `is_ascii_digit` or `is_digit`.
///
/// This method doesn't cover everything that could be considered a number, e.g. ideographic numbers like '三'.
/// If you want everything including characters with overlapping purposes then you might want to use
/// a unicode or language-processing library that exposes the appropriate character properties instead
/// of looking at the unicode categories.
///
/// If you want to parse ASCII decimal digits (0-9) or ASCII base-N, use
/// `is_ascii_digit` or `is_digit` instead.
///
/// [Unicode Standard]: https://www.unicode.org/versions/latest/
/// [ucd]: https://www.unicode.org/reports/tr44/
@ -911,6 +920,7 @@ impl char {
/// assert!(!'K'.is_numeric());
/// assert!(!'و'.is_numeric());
/// assert!(!'藏'.is_numeric());
/// assert!(!'三'.is_numeric());
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]