1366 lines
41 KiB
Rust
1366 lines
41 KiB
Rust
//! impl char {}
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use crate::slice;
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use crate::str::from_utf8_unchecked_mut;
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use crate::unicode::printable::is_printable;
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use crate::unicode::tables::{conversions, derived_property, general_category, property};
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use super::*;
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#[lang = "char"]
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impl char {
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/// Checks if a `char` is a digit in the given radix.
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///
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/// A 'radix' here is sometimes also called a 'base'. A radix of two
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/// indicates a binary number, a radix of ten, decimal, and a radix of
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/// sixteen, hexadecimal, to give some common values. Arbitrary
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/// radices are supported.
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///
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/// Compared to `is_numeric()`, this function only recognizes the characters
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/// `0-9`, `a-z` and `A-Z`.
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///
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/// 'Digit' is defined to be only the following characters:
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///
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/// * `0-9`
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/// * `a-z`
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/// * `A-Z`
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///
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/// For a more comprehensive understanding of 'digit', see [`is_numeric`][is_numeric].
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///
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/// [is_numeric]: #method.is_numeric
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///
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/// # Panics
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///
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/// Panics if given a radix larger than 36.
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// assert!('1'.is_digit(10));
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/// assert!('f'.is_digit(16));
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/// assert!(!'f'.is_digit(10));
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/// ```
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///
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/// Passing a large radix, causing a panic:
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///
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/// ```
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/// use std::thread;
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///
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/// let result = thread::spawn(|| {
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/// // this panics
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/// '1'.is_digit(37);
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/// }).join();
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///
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/// assert!(result.is_err());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn is_digit(self, radix: u32) -> bool {
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self.to_digit(radix).is_some()
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}
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/// Converts a `char` to a digit in the given radix.
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///
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/// A 'radix' here is sometimes also called a 'base'. A radix of two
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/// indicates a binary number, a radix of ten, decimal, and a radix of
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/// sixteen, hexadecimal, to give some common values. Arbitrary
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/// radices are supported.
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///
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/// 'Digit' is defined to be only the following characters:
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///
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/// * `0-9`
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/// * `a-z`
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/// * `A-Z`
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///
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/// # Errors
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///
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/// Returns `None` if the `char` does not refer to a digit in the given radix.
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///
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/// # Panics
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///
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/// Panics if given a radix larger than 36.
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// assert_eq!('1'.to_digit(10), Some(1));
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/// assert_eq!('f'.to_digit(16), Some(15));
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/// ```
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///
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/// Passing a non-digit results in failure:
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///
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/// ```
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/// assert_eq!('f'.to_digit(10), None);
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/// assert_eq!('z'.to_digit(16), None);
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/// ```
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///
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/// Passing a large radix, causing a panic:
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///
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/// ```
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/// use std::thread;
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///
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/// let result = thread::spawn(|| {
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/// '1'.to_digit(37);
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/// }).join();
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///
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/// assert!(result.is_err());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn to_digit(self, radix: u32) -> Option<u32> {
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assert!(radix <= 36, "to_digit: radix is too high (maximum 36)");
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// the code is split up here to improve execution speed for cases where
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// the `radix` is constant and 10 or smaller
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let val = if radix <= 10 {
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match self {
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'0' ..= '9' => self as u32 - '0' as u32,
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_ => return None,
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}
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} else {
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match self {
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'0'..='9' => self as u32 - '0' as u32,
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'a'..='z' => self as u32 - 'a' as u32 + 10,
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'A'..='Z' => self as u32 - 'A' as u32 + 10,
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_ => return None,
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}
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};
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if val < radix { Some(val) }
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else { None }
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}
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/// Returns an iterator that yields the hexadecimal Unicode escape of a
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/// character as `char`s.
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///
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/// This will escape characters with the Rust syntax of the form
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/// `\u{NNNNNN}` where `NNNNNN` is a hexadecimal representation.
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///
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/// # Examples
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///
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/// As an iterator:
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///
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/// ```
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/// for c in '❤'.escape_unicode() {
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/// print!("{}", c);
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/// }
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/// println!();
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/// ```
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///
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/// Using `println!` directly:
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///
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/// ```
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/// println!("{}", '❤'.escape_unicode());
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/// ```
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///
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/// Both are equivalent to:
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///
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/// ```
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/// println!("\\u{{2764}}");
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/// ```
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///
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/// Using `to_string`:
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///
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/// ```
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/// assert_eq!('❤'.escape_unicode().to_string(), "\\u{2764}");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn escape_unicode(self) -> EscapeUnicode {
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let c = self as u32;
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// or-ing 1 ensures that for c==0 the code computes that one
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// digit should be printed and (which is the same) avoids the
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// (31 - 32) underflow
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let msb = 31 - (c | 1).leading_zeros();
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// the index of the most significant hex digit
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let ms_hex_digit = msb / 4;
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EscapeUnicode {
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c: self,
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state: EscapeUnicodeState::Backslash,
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hex_digit_idx: ms_hex_digit as usize,
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}
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}
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/// An extended version of `escape_debug` that optionally permits escaping
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/// Extended Grapheme codepoints. This allows us to format characters like
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/// nonspacing marks better when they're at the start of a string.
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#[inline]
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pub(crate) fn escape_debug_ext(self, escape_grapheme_extended: bool) -> EscapeDebug {
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let init_state = match self {
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'\t' => EscapeDefaultState::Backslash('t'),
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'\r' => EscapeDefaultState::Backslash('r'),
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'\n' => EscapeDefaultState::Backslash('n'),
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'\\' | '\'' | '"' => EscapeDefaultState::Backslash(self),
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_ if escape_grapheme_extended && self.is_grapheme_extended() => {
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EscapeDefaultState::Unicode(self.escape_unicode())
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}
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_ if is_printable(self) => EscapeDefaultState::Char(self),
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_ => EscapeDefaultState::Unicode(self.escape_unicode()),
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};
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EscapeDebug(EscapeDefault { state: init_state })
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}
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/// Returns an iterator that yields the literal escape code of a character
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/// as `char`s.
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///
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/// This will escape the characters similar to the `Debug` implementations
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/// of `str` or `char`.
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///
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/// # Examples
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///
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/// As an iterator:
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///
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/// ```
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/// for c in '\n'.escape_debug() {
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/// print!("{}", c);
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/// }
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/// println!();
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/// ```
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///
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/// Using `println!` directly:
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///
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/// ```
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/// println!("{}", '\n'.escape_debug());
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/// ```
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///
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/// Both are equivalent to:
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///
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/// ```
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/// println!("\\n");
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/// ```
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///
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/// Using `to_string`:
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///
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/// ```
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/// assert_eq!('\n'.escape_debug().to_string(), "\\n");
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/// ```
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#[stable(feature = "char_escape_debug", since = "1.20.0")]
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#[inline]
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pub fn escape_debug(self) -> EscapeDebug {
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self.escape_debug_ext(true)
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}
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/// Returns an iterator that yields the literal escape code of a character
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/// as `char`s.
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///
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/// The default is chosen with a bias toward producing literals that are
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/// legal in a variety of languages, including C++11 and similar C-family
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/// languages. The exact rules are:
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///
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/// * Tab is escaped as `\t`.
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/// * Carriage return is escaped as `\r`.
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/// * Line feed is escaped as `\n`.
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/// * Single quote is escaped as `\'`.
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/// * Double quote is escaped as `\"`.
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/// * Backslash is escaped as `\\`.
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/// * Any character in the 'printable ASCII' range `0x20` .. `0x7e`
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/// inclusive is not escaped.
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/// * All other characters are given hexadecimal Unicode escapes; see
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/// [`escape_unicode`][escape_unicode].
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///
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/// [escape_unicode]: #method.escape_unicode
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///
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/// # Examples
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///
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/// As an iterator:
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///
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/// ```
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/// for c in '"'.escape_default() {
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/// print!("{}", c);
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/// }
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/// println!();
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/// ```
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///
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/// Using `println!` directly:
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///
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/// ```
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/// println!("{}", '"'.escape_default());
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/// ```
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///
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///
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/// Both are equivalent to:
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///
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/// ```
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/// println!("\\\"");
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/// ```
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///
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/// Using `to_string`:
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///
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/// ```
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/// assert_eq!('"'.escape_default().to_string(), "\\\"");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn escape_default(self) -> EscapeDefault {
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let init_state = match self {
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'\t' => EscapeDefaultState::Backslash('t'),
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'\r' => EscapeDefaultState::Backslash('r'),
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'\n' => EscapeDefaultState::Backslash('n'),
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'\\' | '\'' | '"' => EscapeDefaultState::Backslash(self),
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'\x20' ..= '\x7e' => EscapeDefaultState::Char(self),
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_ => EscapeDefaultState::Unicode(self.escape_unicode())
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};
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EscapeDefault { state: init_state }
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}
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/// Returns the number of bytes this `char` would need if encoded in UTF-8.
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///
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/// That number of bytes is always between 1 and 4, inclusive.
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// let len = 'A'.len_utf8();
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/// assert_eq!(len, 1);
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///
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/// let len = 'ß'.len_utf8();
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/// assert_eq!(len, 2);
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///
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/// let len = 'ℝ'.len_utf8();
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/// assert_eq!(len, 3);
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///
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/// let len = '💣'.len_utf8();
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/// assert_eq!(len, 4);
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/// ```
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///
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/// The `&str` type guarantees that its contents are UTF-8, and so we can compare the length it
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/// would take if each code point was represented as a `char` vs in the `&str` itself:
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///
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/// ```
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/// // as chars
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/// let eastern = '東';
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/// let capital = '京';
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///
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/// // both can be represented as three bytes
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/// assert_eq!(3, eastern.len_utf8());
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/// assert_eq!(3, capital.len_utf8());
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///
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/// // as a &str, these two are encoded in UTF-8
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/// let tokyo = "東京";
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///
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/// let len = eastern.len_utf8() + capital.len_utf8();
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///
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/// // we can see that they take six bytes total...
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/// assert_eq!(6, tokyo.len());
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///
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/// // ... just like the &str
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/// assert_eq!(len, tokyo.len());
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn len_utf8(self) -> usize {
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let code = self as u32;
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if code < MAX_ONE_B {
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1
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} else if code < MAX_TWO_B {
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2
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} else if code < MAX_THREE_B {
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3
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} else {
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4
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}
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}
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/// Returns the number of 16-bit code units this `char` would need if
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/// encoded in UTF-16.
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///
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/// See the documentation for [`len_utf8`] for more explanation of this
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/// concept. This function is a mirror, but for UTF-16 instead of UTF-8.
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///
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/// [`len_utf8`]: #method.len_utf8
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// let n = 'ß'.len_utf16();
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/// assert_eq!(n, 1);
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///
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/// let len = '💣'.len_utf16();
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/// assert_eq!(len, 2);
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[inline]
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pub fn len_utf16(self) -> usize {
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let ch = self as u32;
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if (ch & 0xFFFF) == ch { 1 } else { 2 }
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}
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/// Encodes this character as UTF-8 into the provided byte buffer,
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/// and then returns the subslice of the buffer that contains the encoded character.
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///
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/// # Panics
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///
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/// Panics if the buffer is not large enough.
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/// A buffer of length four is large enough to encode any `char`.
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///
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/// # Examples
|
||
///
|
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/// In both of these examples, 'ß' takes two bytes to encode.
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///
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/// ```
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/// let mut b = [0; 2];
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///
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/// let result = 'ß'.encode_utf8(&mut b);
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///
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/// assert_eq!(result, "ß");
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///
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/// assert_eq!(result.len(), 2);
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/// ```
|
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///
|
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/// A buffer that's too small:
|
||
///
|
||
/// ```
|
||
/// use std::thread;
|
||
///
|
||
/// let result = thread::spawn(|| {
|
||
/// let mut b = [0; 1];
|
||
///
|
||
/// // this panics
|
||
/// 'ß'.encode_utf8(&mut b);
|
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/// }).join();
|
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///
|
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/// assert!(result.is_err());
|
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/// ```
|
||
#[stable(feature = "unicode_encode_char", since = "1.15.0")]
|
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#[inline]
|
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pub fn encode_utf8(self, dst: &mut [u8]) -> &mut str {
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let code = self as u32;
|
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unsafe {
|
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let len =
|
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if code < MAX_ONE_B && !dst.is_empty() {
|
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*dst.get_unchecked_mut(0) = code as u8;
|
||
1
|
||
} else if code < MAX_TWO_B && dst.len() >= 2 {
|
||
*dst.get_unchecked_mut(0) = (code >> 6 & 0x1F) as u8 | TAG_TWO_B;
|
||
*dst.get_unchecked_mut(1) = (code & 0x3F) as u8 | TAG_CONT;
|
||
2
|
||
} else if code < MAX_THREE_B && dst.len() >= 3 {
|
||
*dst.get_unchecked_mut(0) = (code >> 12 & 0x0F) as u8 | TAG_THREE_B;
|
||
*dst.get_unchecked_mut(1) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
|
||
*dst.get_unchecked_mut(2) = (code & 0x3F) as u8 | TAG_CONT;
|
||
3
|
||
} else if dst.len() >= 4 {
|
||
*dst.get_unchecked_mut(0) = (code >> 18 & 0x07) as u8 | TAG_FOUR_B;
|
||
*dst.get_unchecked_mut(1) = (code >> 12 & 0x3F) as u8 | TAG_CONT;
|
||
*dst.get_unchecked_mut(2) = (code >> 6 & 0x3F) as u8 | TAG_CONT;
|
||
*dst.get_unchecked_mut(3) = (code & 0x3F) as u8 | TAG_CONT;
|
||
4
|
||
} else {
|
||
panic!("encode_utf8: need {} bytes to encode U+{:X}, but the buffer has {}",
|
||
from_u32_unchecked(code).len_utf8(),
|
||
code,
|
||
dst.len())
|
||
};
|
||
from_utf8_unchecked_mut(dst.get_unchecked_mut(..len))
|
||
}
|
||
}
|
||
|
||
/// Encodes this character as UTF-16 into the provided `u16` buffer,
|
||
/// and then returns the subslice of the buffer that contains the encoded character.
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// Panics if the buffer is not large enough.
|
||
/// A buffer of length 2 is large enough to encode any `char`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// In both of these examples, '𝕊' takes two `u16`s to encode.
|
||
///
|
||
/// ```
|
||
/// let mut b = [0; 2];
|
||
///
|
||
/// let result = '𝕊'.encode_utf16(&mut b);
|
||
///
|
||
/// assert_eq!(result.len(), 2);
|
||
/// ```
|
||
///
|
||
/// A buffer that's too small:
|
||
///
|
||
/// ```
|
||
/// use std::thread;
|
||
///
|
||
/// let result = thread::spawn(|| {
|
||
/// let mut b = [0; 1];
|
||
///
|
||
/// // this panics
|
||
/// '𝕊'.encode_utf16(&mut b);
|
||
/// }).join();
|
||
///
|
||
/// assert!(result.is_err());
|
||
/// ```
|
||
#[stable(feature = "unicode_encode_char", since = "1.15.0")]
|
||
#[inline]
|
||
pub fn encode_utf16(self, dst: &mut [u16]) -> &mut [u16] {
|
||
let mut code = self as u32;
|
||
unsafe {
|
||
if (code & 0xFFFF) == code && !dst.is_empty() {
|
||
// The BMP falls through (assuming non-surrogate, as it should)
|
||
*dst.get_unchecked_mut(0) = code as u16;
|
||
slice::from_raw_parts_mut(dst.as_mut_ptr(), 1)
|
||
} else if dst.len() >= 2 {
|
||
// Supplementary planes break into surrogates.
|
||
code -= 0x1_0000;
|
||
*dst.get_unchecked_mut(0) = 0xD800 | ((code >> 10) as u16);
|
||
*dst.get_unchecked_mut(1) = 0xDC00 | ((code as u16) & 0x3FF);
|
||
slice::from_raw_parts_mut(dst.as_mut_ptr(), 2)
|
||
} else {
|
||
panic!("encode_utf16: need {} units to encode U+{:X}, but the buffer has {}",
|
||
from_u32_unchecked(code).len_utf16(),
|
||
code,
|
||
dst.len())
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Returns `true` if this `char` is an alphabetic code point, and false if not.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!('a'.is_alphabetic());
|
||
/// assert!('京'.is_alphabetic());
|
||
///
|
||
/// let c = '💝';
|
||
/// // love is many things, but it is not alphabetic
|
||
/// assert!(!c.is_alphabetic());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_alphabetic(self) -> bool {
|
||
match self {
|
||
'a'..='z' | 'A'..='Z' => true,
|
||
c if c > '\x7f' => derived_property::Alphabetic(c),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Returns `true` if this `char` is lowercase.
|
||
///
|
||
/// 'Lowercase' is defined according to the terms of the Unicode Derived Core
|
||
/// Property `Lowercase`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!('a'.is_lowercase());
|
||
/// assert!('δ'.is_lowercase());
|
||
/// assert!(!'A'.is_lowercase());
|
||
/// assert!(!'Δ'.is_lowercase());
|
||
///
|
||
/// // The various Chinese scripts do not have case, and so:
|
||
/// assert!(!'中'.is_lowercase());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_lowercase(self) -> bool {
|
||
match self {
|
||
'a'..='z' => true,
|
||
c if c > '\x7f' => derived_property::Lowercase(c),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Returns `true` if this `char` is uppercase.
|
||
///
|
||
/// 'Uppercase' is defined according to the terms of the Unicode Derived Core
|
||
/// Property `Uppercase`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!(!'a'.is_uppercase());
|
||
/// assert!(!'δ'.is_uppercase());
|
||
/// assert!('A'.is_uppercase());
|
||
/// assert!('Δ'.is_uppercase());
|
||
///
|
||
/// // The various Chinese scripts do not have case, and so:
|
||
/// assert!(!'中'.is_uppercase());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_uppercase(self) -> bool {
|
||
match self {
|
||
'A'..='Z' => true,
|
||
c if c > '\x7f' => derived_property::Uppercase(c),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Returns `true` if this `char` is whitespace.
|
||
///
|
||
/// 'Whitespace' is defined according to the terms of the Unicode Derived Core
|
||
/// Property `White_Space`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!(' '.is_whitespace());
|
||
///
|
||
/// // a non-breaking space
|
||
/// assert!('\u{A0}'.is_whitespace());
|
||
///
|
||
/// assert!(!'越'.is_whitespace());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_whitespace(self) -> bool {
|
||
match self {
|
||
' ' | '\x09'..='\x0d' => true,
|
||
c if c > '\x7f' => property::White_Space(c),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Returns `true` if this `char` is alphanumeric.
|
||
///
|
||
/// 'Alphanumeric'-ness is defined in terms of the Unicode General Categories
|
||
/// `Nd`, `Nl`, `No` and the Derived Core Property `Alphabetic`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!('٣'.is_alphanumeric());
|
||
/// assert!('7'.is_alphanumeric());
|
||
/// assert!('৬'.is_alphanumeric());
|
||
/// assert!('¾'.is_alphanumeric());
|
||
/// assert!('①'.is_alphanumeric());
|
||
/// assert!('K'.is_alphanumeric());
|
||
/// assert!('و'.is_alphanumeric());
|
||
/// assert!('藏'.is_alphanumeric());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_alphanumeric(self) -> bool {
|
||
self.is_alphabetic() || self.is_numeric()
|
||
}
|
||
|
||
/// Returns `true` if this `char` is a control code point.
|
||
///
|
||
/// 'Control code point' is defined in terms of the Unicode General
|
||
/// Category `Cc`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// // U+009C, STRING TERMINATOR
|
||
/// assert!(''.is_control());
|
||
/// assert!(!'q'.is_control());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_control(self) -> bool {
|
||
general_category::Cc(self)
|
||
}
|
||
|
||
/// Returns `true` if this `char` is an extended grapheme character.
|
||
///
|
||
/// 'Extended grapheme character' is defined in terms of the Unicode Shaping and Rendering
|
||
/// Category `Grapheme_Extend`.
|
||
#[inline]
|
||
pub(crate) fn is_grapheme_extended(self) -> bool {
|
||
derived_property::Grapheme_Extend(self)
|
||
}
|
||
|
||
/// Returns `true` if this `char` is numeric.
|
||
///
|
||
/// 'Numeric'-ness is defined in terms of the Unicode General Categories
|
||
/// `Nd`, `Nl`, `No`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// Basic usage:
|
||
///
|
||
/// ```
|
||
/// assert!('٣'.is_numeric());
|
||
/// assert!('7'.is_numeric());
|
||
/// assert!('৬'.is_numeric());
|
||
/// assert!('¾'.is_numeric());
|
||
/// assert!('①'.is_numeric());
|
||
/// assert!(!'K'.is_numeric());
|
||
/// assert!(!'و'.is_numeric());
|
||
/// assert!(!'藏'.is_numeric());
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn is_numeric(self) -> bool {
|
||
match self {
|
||
'0'..='9' => true,
|
||
c if c > '\x7f' => general_category::N(c),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// Returns an iterator that yields the lowercase equivalent of a `char`
|
||
/// as one or more `char`s.
|
||
///
|
||
/// If a character does not have a lowercase equivalent, the same character
|
||
/// will be returned back by the iterator.
|
||
///
|
||
/// This performs complex unconditional mappings with no tailoring: it maps
|
||
/// one Unicode character to its lowercase equivalent according to the
|
||
/// [Unicode database] and the additional complex mappings
|
||
/// [`SpecialCasing.txt`]. Conditional mappings (based on context or
|
||
/// language) are not considered here.
|
||
///
|
||
/// For a full reference, see [here][reference].
|
||
///
|
||
/// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
|
||
///
|
||
/// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt
|
||
///
|
||
/// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// As an iterator:
|
||
///
|
||
/// ```
|
||
/// for c in 'İ'.to_lowercase() {
|
||
/// print!("{}", c);
|
||
/// }
|
||
/// println!();
|
||
/// ```
|
||
///
|
||
/// Using `println!` directly:
|
||
///
|
||
/// ```
|
||
/// println!("{}", 'İ'.to_lowercase());
|
||
/// ```
|
||
///
|
||
/// Both are equivalent to:
|
||
///
|
||
/// ```
|
||
/// println!("i\u{307}");
|
||
/// ```
|
||
///
|
||
/// Using `to_string`:
|
||
///
|
||
/// ```
|
||
/// assert_eq!('C'.to_lowercase().to_string(), "c");
|
||
///
|
||
/// // Sometimes the result is more than one character:
|
||
/// assert_eq!('İ'.to_lowercase().to_string(), "i\u{307}");
|
||
///
|
||
/// // Characters that do not have both uppercase and lowercase
|
||
/// // convert into themselves.
|
||
/// assert_eq!('山'.to_lowercase().to_string(), "山");
|
||
/// ```
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn to_lowercase(self) -> ToLowercase {
|
||
ToLowercase(CaseMappingIter::new(conversions::to_lower(self)))
|
||
}
|
||
|
||
/// Returns an iterator that yields the uppercase equivalent of a `char`
|
||
/// as one or more `char`s.
|
||
///
|
||
/// If a character does not have an uppercase equivalent, the same character
|
||
/// will be returned back by the iterator.
|
||
///
|
||
/// This performs complex unconditional mappings with no tailoring: it maps
|
||
/// one Unicode character to its uppercase equivalent according to the
|
||
/// [Unicode database] and the additional complex mappings
|
||
/// [`SpecialCasing.txt`]. Conditional mappings (based on context or
|
||
/// language) are not considered here.
|
||
///
|
||
/// For a full reference, see [here][reference].
|
||
///
|
||
/// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
|
||
///
|
||
/// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt
|
||
///
|
||
/// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// As an iterator:
|
||
///
|
||
/// ```
|
||
/// for c in 'ß'.to_uppercase() {
|
||
/// print!("{}", c);
|
||
/// }
|
||
/// println!();
|
||
/// ```
|
||
///
|
||
/// Using `println!` directly:
|
||
///
|
||
/// ```
|
||
/// println!("{}", 'ß'.to_uppercase());
|
||
/// ```
|
||
///
|
||
/// Both are equivalent to:
|
||
///
|
||
/// ```
|
||
/// println!("SS");
|
||
/// ```
|
||
///
|
||
/// Using `to_string`:
|
||
///
|
||
/// ```
|
||
/// assert_eq!('c'.to_uppercase().to_string(), "C");
|
||
///
|
||
/// // Sometimes the result is more than one character:
|
||
/// assert_eq!('ß'.to_uppercase().to_string(), "SS");
|
||
///
|
||
/// // Characters that do not have both uppercase and lowercase
|
||
/// // convert into themselves.
|
||
/// assert_eq!('山'.to_uppercase().to_string(), "山");
|
||
/// ```
|
||
///
|
||
/// # Note on locale
|
||
///
|
||
/// In Turkish, the equivalent of 'i' in Latin has five forms instead of two:
|
||
///
|
||
/// * 'Dotless': I / ı, sometimes written ï
|
||
/// * 'Dotted': İ / i
|
||
///
|
||
/// Note that the lowercase dotted 'i' is the same as the Latin. Therefore:
|
||
///
|
||
/// ```
|
||
/// let upper_i = 'i'.to_uppercase().to_string();
|
||
/// ```
|
||
///
|
||
/// The value of `upper_i` here relies on the language of the text: if we're
|
||
/// in `en-US`, it should be `"I"`, but if we're in `tr_TR`, it should
|
||
/// be `"İ"`. `to_uppercase()` does not take this into account, and so:
|
||
///
|
||
/// ```
|
||
/// let upper_i = 'i'.to_uppercase().to_string();
|
||
///
|
||
/// assert_eq!(upper_i, "I");
|
||
/// ```
|
||
///
|
||
/// holds across languages.
|
||
#[stable(feature = "rust1", since = "1.0.0")]
|
||
#[inline]
|
||
pub fn to_uppercase(self) -> ToUppercase {
|
||
ToUppercase(CaseMappingIter::new(conversions::to_upper(self)))
|
||
}
|
||
|
||
/// Checks if the value is within the ASCII range.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let ascii = 'a';
|
||
/// let non_ascii = '❤';
|
||
///
|
||
/// assert!(ascii.is_ascii());
|
||
/// assert!(!non_ascii.is_ascii());
|
||
/// ```
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub const fn is_ascii(&self) -> bool {
|
||
*self as u32 <= 0x7F
|
||
}
|
||
|
||
/// Makes a copy of the value in its ASCII upper case equivalent.
|
||
///
|
||
/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
|
||
/// but non-ASCII letters are unchanged.
|
||
///
|
||
/// To uppercase the value in-place, use [`make_ascii_uppercase`].
|
||
///
|
||
/// To uppercase ASCII characters in addition to non-ASCII characters, use
|
||
/// [`to_uppercase`].
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let ascii = 'a';
|
||
/// let non_ascii = '❤';
|
||
///
|
||
/// assert_eq!('A', ascii.to_ascii_uppercase());
|
||
/// assert_eq!('❤', non_ascii.to_ascii_uppercase());
|
||
/// ```
|
||
///
|
||
/// [`make_ascii_uppercase`]: #method.make_ascii_uppercase
|
||
/// [`to_uppercase`]: #method.to_uppercase
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub fn to_ascii_uppercase(&self) -> char {
|
||
if self.is_ascii() {
|
||
(*self as u8).to_ascii_uppercase() as char
|
||
} else {
|
||
*self
|
||
}
|
||
}
|
||
|
||
/// Makes a copy of the value in its ASCII lower case equivalent.
|
||
///
|
||
/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
|
||
/// but non-ASCII letters are unchanged.
|
||
///
|
||
/// To lowercase the value in-place, use [`make_ascii_lowercase`].
|
||
///
|
||
/// To lowercase ASCII characters in addition to non-ASCII characters, use
|
||
/// [`to_lowercase`].
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let ascii = 'A';
|
||
/// let non_ascii = '❤';
|
||
///
|
||
/// assert_eq!('a', ascii.to_ascii_lowercase());
|
||
/// assert_eq!('❤', non_ascii.to_ascii_lowercase());
|
||
/// ```
|
||
///
|
||
/// [`make_ascii_lowercase`]: #method.make_ascii_lowercase
|
||
/// [`to_lowercase`]: #method.to_lowercase
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub fn to_ascii_lowercase(&self) -> char {
|
||
if self.is_ascii() {
|
||
(*self as u8).to_ascii_lowercase() as char
|
||
} else {
|
||
*self
|
||
}
|
||
}
|
||
|
||
/// Checks that two values are an ASCII case-insensitive match.
|
||
///
|
||
/// Equivalent to `to_ascii_lowercase(a) == to_ascii_lowercase(b)`.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let upper_a = 'A';
|
||
/// let lower_a = 'a';
|
||
/// let lower_z = 'z';
|
||
///
|
||
/// assert!(upper_a.eq_ignore_ascii_case(&lower_a));
|
||
/// assert!(upper_a.eq_ignore_ascii_case(&upper_a));
|
||
/// assert!(!upper_a.eq_ignore_ascii_case(&lower_z));
|
||
/// ```
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub fn eq_ignore_ascii_case(&self, other: &char) -> bool {
|
||
self.to_ascii_lowercase() == other.to_ascii_lowercase()
|
||
}
|
||
|
||
/// Converts this type to its ASCII upper case equivalent in-place.
|
||
///
|
||
/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
|
||
/// but non-ASCII letters are unchanged.
|
||
///
|
||
/// To return a new uppercased value without modifying the existing one, use
|
||
/// [`to_ascii_uppercase`].
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let mut ascii = 'a';
|
||
///
|
||
/// ascii.make_ascii_uppercase();
|
||
///
|
||
/// assert_eq!('A', ascii);
|
||
/// ```
|
||
///
|
||
/// [`to_ascii_uppercase`]: #method.to_ascii_uppercase
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub fn make_ascii_uppercase(&mut self) {
|
||
*self = self.to_ascii_uppercase();
|
||
}
|
||
|
||
/// Converts this type to its ASCII lower case equivalent in-place.
|
||
///
|
||
/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
|
||
/// but non-ASCII letters are unchanged.
|
||
///
|
||
/// To return a new lowercased value without modifying the existing one, use
|
||
/// [`to_ascii_lowercase`].
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let mut ascii = 'A';
|
||
///
|
||
/// ascii.make_ascii_lowercase();
|
||
///
|
||
/// assert_eq!('a', ascii);
|
||
/// ```
|
||
///
|
||
/// [`to_ascii_lowercase`]: #method.to_ascii_lowercase
|
||
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
|
||
#[inline]
|
||
pub fn make_ascii_lowercase(&mut self) {
|
||
*self = self.to_ascii_lowercase();
|
||
}
|
||
|
||
/// Checks if the value is an ASCII alphabetic character:
|
||
///
|
||
/// - U+0041 'A' ..= U+005A 'Z', or
|
||
/// - U+0061 'a' ..= U+007A 'z'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(uppercase_a.is_ascii_alphabetic());
|
||
/// assert!(uppercase_g.is_ascii_alphabetic());
|
||
/// assert!(a.is_ascii_alphabetic());
|
||
/// assert!(g.is_ascii_alphabetic());
|
||
/// assert!(!zero.is_ascii_alphabetic());
|
||
/// assert!(!percent.is_ascii_alphabetic());
|
||
/// assert!(!space.is_ascii_alphabetic());
|
||
/// assert!(!lf.is_ascii_alphabetic());
|
||
/// assert!(!esc.is_ascii_alphabetic());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_alphabetic(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_alphabetic()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII uppercase character:
|
||
/// U+0041 'A' ..= U+005A 'Z'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(uppercase_a.is_ascii_uppercase());
|
||
/// assert!(uppercase_g.is_ascii_uppercase());
|
||
/// assert!(!a.is_ascii_uppercase());
|
||
/// assert!(!g.is_ascii_uppercase());
|
||
/// assert!(!zero.is_ascii_uppercase());
|
||
/// assert!(!percent.is_ascii_uppercase());
|
||
/// assert!(!space.is_ascii_uppercase());
|
||
/// assert!(!lf.is_ascii_uppercase());
|
||
/// assert!(!esc.is_ascii_uppercase());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_uppercase(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_uppercase()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII lowercase character:
|
||
/// U+0061 'a' ..= U+007A 'z'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(!uppercase_a.is_ascii_lowercase());
|
||
/// assert!(!uppercase_g.is_ascii_lowercase());
|
||
/// assert!(a.is_ascii_lowercase());
|
||
/// assert!(g.is_ascii_lowercase());
|
||
/// assert!(!zero.is_ascii_lowercase());
|
||
/// assert!(!percent.is_ascii_lowercase());
|
||
/// assert!(!space.is_ascii_lowercase());
|
||
/// assert!(!lf.is_ascii_lowercase());
|
||
/// assert!(!esc.is_ascii_lowercase());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_lowercase(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_lowercase()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII alphanumeric character:
|
||
///
|
||
/// - U+0041 'A' ..= U+005A 'Z', or
|
||
/// - U+0061 'a' ..= U+007A 'z', or
|
||
/// - U+0030 '0' ..= U+0039 '9'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(uppercase_a.is_ascii_alphanumeric());
|
||
/// assert!(uppercase_g.is_ascii_alphanumeric());
|
||
/// assert!(a.is_ascii_alphanumeric());
|
||
/// assert!(g.is_ascii_alphanumeric());
|
||
/// assert!(zero.is_ascii_alphanumeric());
|
||
/// assert!(!percent.is_ascii_alphanumeric());
|
||
/// assert!(!space.is_ascii_alphanumeric());
|
||
/// assert!(!lf.is_ascii_alphanumeric());
|
||
/// assert!(!esc.is_ascii_alphanumeric());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_alphanumeric(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_alphanumeric()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII decimal digit:
|
||
/// U+0030 '0' ..= U+0039 '9'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(!uppercase_a.is_ascii_digit());
|
||
/// assert!(!uppercase_g.is_ascii_digit());
|
||
/// assert!(!a.is_ascii_digit());
|
||
/// assert!(!g.is_ascii_digit());
|
||
/// assert!(zero.is_ascii_digit());
|
||
/// assert!(!percent.is_ascii_digit());
|
||
/// assert!(!space.is_ascii_digit());
|
||
/// assert!(!lf.is_ascii_digit());
|
||
/// assert!(!esc.is_ascii_digit());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_digit(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_digit()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII hexadecimal digit:
|
||
///
|
||
/// - U+0030 '0' ..= U+0039 '9', or
|
||
/// - U+0041 'A' ..= U+0046 'F', or
|
||
/// - U+0061 'a' ..= U+0066 'f'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(uppercase_a.is_ascii_hexdigit());
|
||
/// assert!(!uppercase_g.is_ascii_hexdigit());
|
||
/// assert!(a.is_ascii_hexdigit());
|
||
/// assert!(!g.is_ascii_hexdigit());
|
||
/// assert!(zero.is_ascii_hexdigit());
|
||
/// assert!(!percent.is_ascii_hexdigit());
|
||
/// assert!(!space.is_ascii_hexdigit());
|
||
/// assert!(!lf.is_ascii_hexdigit());
|
||
/// assert!(!esc.is_ascii_hexdigit());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_hexdigit(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_hexdigit()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII punctuation character:
|
||
///
|
||
/// - U+0021 ..= U+002F `! " # $ % & ' ( ) * + , - . /`, or
|
||
/// - U+003A ..= U+0040 `: ; < = > ? @`, or
|
||
/// - U+005B ..= U+0060 ``[ \ ] ^ _ ` ``, or
|
||
/// - U+007B ..= U+007E `{ | } ~`
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(!uppercase_a.is_ascii_punctuation());
|
||
/// assert!(!uppercase_g.is_ascii_punctuation());
|
||
/// assert!(!a.is_ascii_punctuation());
|
||
/// assert!(!g.is_ascii_punctuation());
|
||
/// assert!(!zero.is_ascii_punctuation());
|
||
/// assert!(percent.is_ascii_punctuation());
|
||
/// assert!(!space.is_ascii_punctuation());
|
||
/// assert!(!lf.is_ascii_punctuation());
|
||
/// assert!(!esc.is_ascii_punctuation());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_punctuation(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_punctuation()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII graphic character:
|
||
/// U+0021 '!' ..= U+007E '~'.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(uppercase_a.is_ascii_graphic());
|
||
/// assert!(uppercase_g.is_ascii_graphic());
|
||
/// assert!(a.is_ascii_graphic());
|
||
/// assert!(g.is_ascii_graphic());
|
||
/// assert!(zero.is_ascii_graphic());
|
||
/// assert!(percent.is_ascii_graphic());
|
||
/// assert!(!space.is_ascii_graphic());
|
||
/// assert!(!lf.is_ascii_graphic());
|
||
/// assert!(!esc.is_ascii_graphic());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_graphic(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_graphic()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII whitespace character:
|
||
/// U+0020 SPACE, U+0009 HORIZONTAL TAB, U+000A LINE FEED,
|
||
/// U+000C FORM FEED, or U+000D CARRIAGE RETURN.
|
||
///
|
||
/// Rust uses the WhatWG Infra Standard's [definition of ASCII
|
||
/// whitespace][infra-aw]. There are several other definitions in
|
||
/// wide use. For instance, [the POSIX locale][pct] includes
|
||
/// U+000B VERTICAL TAB as well as all the above characters,
|
||
/// but—from the very same specification—[the default rule for
|
||
/// "field splitting" in the Bourne shell][bfs] considers *only*
|
||
/// SPACE, HORIZONTAL TAB, and LINE FEED as whitespace.
|
||
///
|
||
/// If you are writing a program that will process an existing
|
||
/// file format, check what that format's definition of whitespace is
|
||
/// before using this function.
|
||
///
|
||
/// [infra-aw]: https://infra.spec.whatwg.org/#ascii-whitespace
|
||
/// [pct]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_03_01
|
||
/// [bfs]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(!uppercase_a.is_ascii_whitespace());
|
||
/// assert!(!uppercase_g.is_ascii_whitespace());
|
||
/// assert!(!a.is_ascii_whitespace());
|
||
/// assert!(!g.is_ascii_whitespace());
|
||
/// assert!(!zero.is_ascii_whitespace());
|
||
/// assert!(!percent.is_ascii_whitespace());
|
||
/// assert!(space.is_ascii_whitespace());
|
||
/// assert!(lf.is_ascii_whitespace());
|
||
/// assert!(!esc.is_ascii_whitespace());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_whitespace(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_whitespace()
|
||
}
|
||
|
||
/// Checks if the value is an ASCII control character:
|
||
/// U+0000 NUL ..= U+001F UNIT SEPARATOR, or U+007F DELETE.
|
||
/// Note that most ASCII whitespace characters are control
|
||
/// characters, but SPACE is not.
|
||
///
|
||
/// # Examples
|
||
///
|
||
/// ```
|
||
/// let uppercase_a = 'A';
|
||
/// let uppercase_g = 'G';
|
||
/// let a = 'a';
|
||
/// let g = 'g';
|
||
/// let zero = '0';
|
||
/// let percent = '%';
|
||
/// let space = ' ';
|
||
/// let lf = '\n';
|
||
/// let esc: char = 0x1b_u8.into();
|
||
///
|
||
/// assert!(!uppercase_a.is_ascii_control());
|
||
/// assert!(!uppercase_g.is_ascii_control());
|
||
/// assert!(!a.is_ascii_control());
|
||
/// assert!(!g.is_ascii_control());
|
||
/// assert!(!zero.is_ascii_control());
|
||
/// assert!(!percent.is_ascii_control());
|
||
/// assert!(!space.is_ascii_control());
|
||
/// assert!(lf.is_ascii_control());
|
||
/// assert!(esc.is_ascii_control());
|
||
/// ```
|
||
#[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")]
|
||
#[inline]
|
||
pub fn is_ascii_control(&self) -> bool {
|
||
self.is_ascii() && (*self as u8).is_ascii_control()
|
||
}
|
||
}
|