| //! impl char {} |
| |
| use slice; |
| use str::from_utf8_unchecked_mut; |
| use super::*; |
| use unicode::printable::is_printable; |
| use unicode::tables::{conversions, derived_property, general_category, property}; |
| |
| #[lang = "char"] |
| impl char { |
| /// Checks if a `char` is a digit in the given radix. |
| /// |
| /// A 'radix' here is sometimes also called a 'base'. A radix of two |
| /// indicates a binary number, a radix of ten, decimal, and a radix of |
| /// sixteen, hexadecimal, to give some common values. Arbitrary |
| /// radices are supported. |
| /// |
| /// Compared to `is_numeric()`, this function only recognizes the characters |
| /// `0-9`, `a-z` and `A-Z`. |
| /// |
| /// 'Digit' is defined to be only the following characters: |
| /// |
| /// * `0-9` |
| /// * `a-z` |
| /// * `A-Z` |
| /// |
| /// For a more comprehensive understanding of 'digit', see [`is_numeric`][is_numeric]. |
| /// |
| /// [is_numeric]: #method.is_numeric |
| /// |
| /// # Panics |
| /// |
| /// Panics if given a radix larger than 36. |
| /// |
| /// # Examples |
| /// |
| /// Basic usage: |
| /// |
| /// ``` |
| /// assert!('1'.is_digit(10)); |
| /// assert!('f'.is_digit(16)); |
| /// assert!(!'f'.is_digit(10)); |
| /// ``` |
| /// |
| /// Passing a large radix, causing a panic: |
| /// |
| /// ``` |
| /// use std::thread; |
| /// |
| /// let result = thread::spawn(|| { |
| /// // this panics |
| /// '1'.is_digit(37); |
| /// }).join(); |
| /// |
| /// assert!(result.is_err()); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn is_digit(self, radix: u32) -> bool { |
| self.to_digit(radix).is_some() |
| } |
| |
| /// Converts a `char` to a digit in the given radix. |
| /// |
| /// A 'radix' here is sometimes also called a 'base'. A radix of two |
| /// indicates a binary number, a radix of ten, decimal, and a radix of |
| /// sixteen, hexadecimal, to give some common values. Arbitrary |
| /// radices are supported. |
| /// |
| /// 'Digit' is defined to be only the following characters: |
| /// |
| /// * `0-9` |
| /// * `a-z` |
| /// * `A-Z` |
| /// |
| /// # Errors |
| /// |
| /// Returns `None` if the `char` does not refer to a digit in the given radix. |
| /// |
| /// # Panics |
| /// |
| /// Panics if given a radix larger than 36. |
| /// |
| /// # Examples |
| /// |
| /// Basic usage: |
| /// |
| /// ``` |
| /// assert_eq!('1'.to_digit(10), Some(1)); |
| /// assert_eq!('f'.to_digit(16), Some(15)); |
| /// ``` |
| /// |
| /// Passing a non-digit results in failure: |
| /// |
| /// ``` |
| /// assert_eq!('f'.to_digit(10), None); |
| /// assert_eq!('z'.to_digit(16), None); |
| /// ``` |
| /// |
| /// Passing a large radix, causing a panic: |
| /// |
| /// ``` |
| /// use std::thread; |
| /// |
| /// let result = thread::spawn(|| { |
| /// '1'.to_digit(37); |
| /// }).join(); |
| /// |
| /// assert!(result.is_err()); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn to_digit(self, radix: u32) -> Option<u32> { |
| assert!(radix <= 36, "to_digit: radix is too high (maximum 36)"); |
| |
| // the code is split up here to improve execution speed for cases where |
| // the `radix` is constant and 10 or smaller |
| let val = if radix <= 10 { |
| match self { |
| '0' ..= '9' => self as u32 - '0' as u32, |
| _ => return None, |
| } |
| } else { |
| match self { |
| '0'..='9' => self as u32 - '0' as u32, |
| 'a'..='z' => self as u32 - 'a' as u32 + 10, |
| 'A'..='Z' => self as u32 - 'A' as u32 + 10, |
| _ => return None, |
| } |
| }; |
| |
| if val < radix { Some(val) } |
| else { None } |
| } |
| |
| /// Returns an iterator that yields the hexadecimal Unicode escape of a |
| /// character as `char`s. |
| /// |
| /// This will escape characters with the Rust syntax of the form |
| /// `\u{NNNNNN}` where `NNNNNN` is a hexadecimal representation. |
| /// |
| /// # Examples |
| /// |
| /// As an iterator: |
| /// |
| /// ``` |
| /// for c in '❤'.escape_unicode() { |
| /// print!("{}", c); |
| /// } |
| /// println!(); |
| /// ``` |
| /// |
| /// Using `println!` directly: |
| /// |
| /// ``` |
| /// println!("{}", '❤'.escape_unicode()); |
| /// ``` |
| /// |
| /// Both are equivalent to: |
| /// |
| /// ``` |
| /// println!("\\u{{2764}}"); |
| /// ``` |
| /// |
| /// Using `to_string`: |
| /// |
| /// ``` |
| /// assert_eq!('❤'.escape_unicode().to_string(), "\\u{2764}"); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn escape_unicode(self) -> EscapeUnicode { |
| let c = self as u32; |
| |
| // or-ing 1 ensures that for c==0 the code computes that one |
| // digit should be printed and (which is the same) avoids the |
| // (31 - 32) underflow |
| let msb = 31 - (c | 1).leading_zeros(); |
| |
| // the index of the most significant hex digit |
| let ms_hex_digit = msb / 4; |
| EscapeUnicode { |
| c: self, |
| state: EscapeUnicodeState::Backslash, |
| hex_digit_idx: ms_hex_digit as usize, |
| } |
| } |
| |
| /// An extended version of `escape_debug` that optionally permits escaping |
| /// Extended Grapheme codepoints. This allows us to format characters like |
| /// nonspacing marks better when they're at the start of a string. |
| #[inline] |
| pub(crate) fn escape_debug_ext(self, escape_grapheme_extended: bool) -> EscapeDebug { |
| let init_state = match self { |
| '\t' => EscapeDefaultState::Backslash('t'), |
| '\r' => EscapeDefaultState::Backslash('r'), |
| '\n' => EscapeDefaultState::Backslash('n'), |
| '\\' | '\'' | '"' => EscapeDefaultState::Backslash(self), |
| _ if escape_grapheme_extended && self.is_grapheme_extended() => { |
| EscapeDefaultState::Unicode(self.escape_unicode()) |
| } |
| _ if is_printable(self) => EscapeDefaultState::Char(self), |
| _ => EscapeDefaultState::Unicode(self.escape_unicode()), |
| }; |
| EscapeDebug(EscapeDefault { state: init_state }) |
| } |
| |
| /// Returns an iterator that yields the literal escape code of a character |
| /// as `char`s. |
| /// |
| /// This will escape the characters similar to the `Debug` implementations |
| /// of `str` or `char`. |
| /// |
| /// # Examples |
| /// |
| /// As an iterator: |
| /// |
| /// ``` |
| /// for c in '\n'.escape_debug() { |
| /// print!("{}", c); |
| /// } |
| /// println!(); |
| /// ``` |
| /// |
| /// Using `println!` directly: |
| /// |
| /// ``` |
| /// println!("{}", '\n'.escape_debug()); |
| /// ``` |
| /// |
| /// Both are equivalent to: |
| /// |
| /// ``` |
| /// println!("\\n"); |
| /// ``` |
| /// |
| /// Using `to_string`: |
| /// |
| /// ``` |
| /// assert_eq!('\n'.escape_debug().to_string(), "\\n"); |
| /// ``` |
| #[stable(feature = "char_escape_debug", since = "1.20.0")] |
| #[inline] |
| pub fn escape_debug(self) -> EscapeDebug { |
| self.escape_debug_ext(true) |
| } |
| |
| /// Returns an iterator that yields the literal escape code of a character |
| /// as `char`s. |
| /// |
| /// The default is chosen with a bias toward producing literals that are |
| /// legal in a variety of languages, including C++11 and similar C-family |
| /// languages. The exact rules are: |
| /// |
| /// * Tab is escaped as `\t`. |
| /// * Carriage return is escaped as `\r`. |
| /// * Line feed is escaped as `\n`. |
| /// * Single quote is escaped as `\'`. |
| /// * Double quote is escaped as `\"`. |
| /// * Backslash is escaped as `\\`. |
| /// * Any character in the 'printable ASCII' range `0x20` .. `0x7e` |
| /// inclusive is not escaped. |
| /// * All other characters are given hexadecimal Unicode escapes; see |
| /// [`escape_unicode`][escape_unicode]. |
| /// |
| /// [escape_unicode]: #method.escape_unicode |
| /// |
| /// # Examples |
| /// |
| /// As an iterator: |
| /// |
| /// ``` |
| /// for c in '"'.escape_default() { |
| /// print!("{}", c); |
| /// } |
| /// println!(); |
| /// ``` |
| /// |
| /// Using `println!` directly: |
| /// |
| /// ``` |
| /// println!("{}", '"'.escape_default()); |
| /// ``` |
| /// |
| /// |
| /// Both are equivalent to: |
| /// |
| /// ``` |
| /// println!("\\\""); |
| /// ``` |
| /// |
| /// Using `to_string`: |
| /// |
| /// ``` |
| /// assert_eq!('"'.escape_default().to_string(), "\\\""); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn escape_default(self) -> EscapeDefault { |
| let init_state = match self { |
| '\t' => EscapeDefaultState::Backslash('t'), |
| '\r' => EscapeDefaultState::Backslash('r'), |
| '\n' => EscapeDefaultState::Backslash('n'), |
| '\\' | '\'' | '"' => EscapeDefaultState::Backslash(self), |
| '\x20' ..= '\x7e' => EscapeDefaultState::Char(self), |
| _ => EscapeDefaultState::Unicode(self.escape_unicode()) |
| }; |
| EscapeDefault { state: init_state } |
| } |
| |
| /// Returns the number of bytes this `char` would need if encoded in UTF-8. |
| /// |
| /// That number of bytes is always between 1 and 4, inclusive. |
| /// |
| /// # Examples |
| /// |
| /// Basic usage: |
| /// |
| /// ``` |
| /// let len = 'A'.len_utf8(); |
| /// assert_eq!(len, 1); |
| /// |
| /// let len = 'ß'.len_utf8(); |
| /// assert_eq!(len, 2); |
| /// |
| /// let len = 'ℝ'.len_utf8(); |
| /// assert_eq!(len, 3); |
| /// |
| /// let len = '💣'.len_utf8(); |
| /// assert_eq!(len, 4); |
| /// ``` |
| /// |
| /// The `&str` type guarantees that its contents are UTF-8, and so we can compare the length it |
| /// would take if each code point was represented as a `char` vs in the `&str` itself: |
| /// |
| /// ``` |
| /// // as chars |
| /// let eastern = '東'; |
| /// let capitol = '京'; |
| /// |
| /// // both can be represented as three bytes |
| /// assert_eq!(3, eastern.len_utf8()); |
| /// assert_eq!(3, capitol.len_utf8()); |
| /// |
| /// // as a &str, these two are encoded in UTF-8 |
| /// let tokyo = "東京"; |
| /// |
| /// let len = eastern.len_utf8() + capitol.len_utf8(); |
| /// |
| /// // we can see that they take six bytes total... |
| /// assert_eq!(6, tokyo.len()); |
| /// |
| /// // ... just like the &str |
| /// assert_eq!(len, tokyo.len()); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn len_utf8(self) -> usize { |
| let code = self as u32; |
| if code < MAX_ONE_B { |
| 1 |
| } else if code < MAX_TWO_B { |
| 2 |
| } else if code < MAX_THREE_B { |
| 3 |
| } else { |
| 4 |
| } |
| } |
| |
| /// Returns the number of 16-bit code units this `char` would need if |
| /// encoded in UTF-16. |
| /// |
| /// See the documentation for [`len_utf8`] for more explanation of this |
| /// concept. This function is a mirror, but for UTF-16 instead of UTF-8. |
| /// |
| /// [`len_utf8`]: #method.len_utf8 |
| /// |
| /// # Examples |
| /// |
| /// Basic usage: |
| /// |
| /// ``` |
| /// let n = 'ß'.len_utf16(); |
| /// assert_eq!(n, 1); |
| /// |
| /// let len = '💣'.len_utf16(); |
| /// assert_eq!(len, 2); |
| /// ``` |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[inline] |
| pub fn len_utf16(self) -> usize { |
| let ch = self as u32; |
| if (ch & 0xFFFF) == ch { 1 } else { 2 } |
| } |
| |
| /// Encodes this character as UTF-8 into the provided byte 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 four is large enough to encode any `char`. |
| /// |
| /// # Examples |
| /// |
| /// In both of these examples, 'ß' takes two bytes to encode. |
| /// |
| /// ``` |
| /// let mut b = [0; 2]; |
| /// |
| /// let result = 'ß'.encode_utf8(&mut b); |
| /// |
| /// assert_eq!(result, "ß"); |
| /// |
| /// 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 |
| /// 'ß'.encode_utf8(&mut b); |
| /// }).join(); |
| /// |
| /// assert!(result.is_err()); |
| /// ``` |
| #[stable(feature = "unicode_encode_char", since = "1.15.0")] |
| #[inline] |
| pub fn encode_utf8(self, dst: &mut [u8]) -> &mut str { |
| let code = self as u32; |
| unsafe { |
| let len = |
| if code < MAX_ONE_B && !dst.is_empty() { |
| *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` satisfies the 'XID_Start' Unicode property, and false |
| /// otherwise. |
| /// |
| /// 'XID_Start' is a Unicode Derived Property specified in |
| /// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications), |
| /// mostly similar to `ID_Start` but modified for closure under `NFKx`. |
| #[unstable(feature = "rustc_private", |
| reason = "mainly needed for compiler internals", |
| issue = "27812")] |
| #[inline] |
| pub fn is_xid_start(self) -> bool { |
| derived_property::XID_Start(self) |
| } |
| |
| /// Returns `true` if this `char` satisfies the 'XID_Continue' Unicode property, and false |
| /// otherwise. |
| /// |
| /// 'XID_Continue' is a Unicode Derived Property specified in |
| /// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications), |
| /// mostly similar to 'ID_Continue' but modified for closure under NFKx. |
| #[unstable(feature = "rustc_private", |
| reason = "mainly needed for compiler internals", |
| issue = "27812")] |
| #[inline] |
| pub fn is_xid_continue(self) -> bool { |
| derived_property::XID_Continue(self) |
| } |
| |
| /// 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() |
| } |
| } |
