bors
commit
08dd30d9eb
@ -210,6 +210,21 @@ impl<T> Arc<T> {
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// contents.
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unsafe { &**self._ptr }
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}
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// Non-inlined part of `drop`.
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#[inline(never)]
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unsafe fn drop_slow(&mut self) {
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let ptr = *self._ptr;
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// Destroy the data at this time, even though we may not free the box allocation itself
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// (there may still be weak pointers lying around).
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drop(ptr::read(&self.inner().data));
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if self.inner().weak.fetch_sub(1, Release) == 1 {
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atomic::fence(Acquire);
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deallocate(ptr as *mut u8, size_of::<ArcInner<T>>(), min_align_of::<ArcInner<T>>())
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}
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}
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}
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/// Get the number of weak references to this value.
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@ -325,6 +340,7 @@ impl<T: Sync + Send> Drop for Arc<T> {
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///
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/// } // implicit drop
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/// ```
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#[inline]
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fn drop(&mut self) {
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// This structure has #[unsafe_no_drop_flag], so this drop glue may run more than once (but
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// it is guaranteed to be zeroed after the first if it's run more than once)
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@ -353,14 +369,8 @@ impl<T: Sync + Send> Drop for Arc<T> {
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// [1]: (www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html)
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atomic::fence(Acquire);
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// Destroy the data at this time, even though we may not free the box allocation itself
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// (there may still be weak pointers lying around).
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unsafe { drop(ptr::read(&self.inner().data)); }
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if self.inner().weak.fetch_sub(1, Release) == 1 {
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atomic::fence(Acquire);
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unsafe { deallocate(ptr as *mut u8, size_of::<ArcInner<T>>(),
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min_align_of::<ArcInner<T>>()) }
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unsafe {
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self.drop_slow()
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}
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}
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}
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@ -41,6 +41,426 @@ pub use normalize::{decompose_canonical, decompose_compatible, compose};
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pub use tables::normalization::canonical_combining_class;
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pub use tables::UNICODE_VERSION;
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#[cfg(stage0)]
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/// Functionality for manipulating `char`.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait CharExt {
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/// Checks if a `char` parses as a numeric digit in the given radix.
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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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/// # Return value
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///
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/// Returns `true` if `c` is a valid digit under `radix`, and `false`
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/// otherwise.
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///
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/// # Panics
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///
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/// Panics if given a radix > 36.
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///
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/// # Examples
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///
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/// ```
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/// let c = '1';
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///
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/// assert!(c.is_digit(10));
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///
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/// assert!('f'.is_digit(16));
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_digit(self, radix: u32) -> bool;
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/// Converts a character to the corresponding digit.
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///
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/// # Return value
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///
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/// If `c` is between '0' and '9', the corresponding value between 0 and
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/// 9. If `c` is 'a' or 'A', 10. If `c` is 'b' or 'B', 11, etc. Returns
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/// none if the character 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 outside the range [0..36].
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///
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/// # Examples
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///
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/// ```
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/// let c = '1';
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///
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/// assert_eq!(c.to_digit(10), Some(1));
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///
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/// assert_eq!('f'.to_digit(16), Some(15));
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_digit(self, radix: u32) -> Option<u32>;
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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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/// All characters are escaped with Rust syntax of the form `\\u{NNNN}`
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/// where `NNNN` is the shortest hexadecimal representation of the code
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/// point.
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///
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/// # Examples
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///
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/// ```
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/// for i in '❤'.escape_unicode() {
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/// println!("{}", i);
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/// }
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/// ```
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///
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/// This prints:
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///
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/// ```text
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/// \
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/// u
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/// {
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/// 2
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/// 7
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/// 6
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/// 4
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/// }
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/// ```
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///
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/// Collecting into a `String`:
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///
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/// ```
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/// let heart: String = '❤'.escape_unicode().collect();
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///
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/// assert_eq!(heart, r"\u{2764}");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn escape_unicode(self) -> EscapeUnicode;
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/// Returns an iterator that yields the 'default' ASCII and
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/// C++11-like literal escape of a character, 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, CR and LF are escaped as '\t', '\r' and '\n' respectively.
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/// * Single-quote, double-quote and backslash chars are backslash-
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/// escaped.
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/// * Any other chars in the range [0x20,0x7e] are not escaped.
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/// * Any other chars are given hex Unicode escapes; see `escape_unicode`.
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///
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/// # Examples
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///
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/// ```
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/// for i in '"'.escape_default() {
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/// println!("{}", i);
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/// }
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/// ```
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///
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/// This prints:
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///
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/// ```text
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/// \
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/// "
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/// ```
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///
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/// Collecting into a `String`:
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///
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/// ```
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/// let quote: String = '"'.escape_default().collect();
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///
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/// assert_eq!(quote, "\\\"");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn escape_default(self) -> EscapeDefault;
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/// Returns the number of bytes this character would need if encoded in
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/// UTF-8.
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///
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/// # Examples
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///
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/// ```
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/// let n = 'ß'.len_utf8();
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///
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/// assert_eq!(n, 2);
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn len_utf8(self) -> usize;
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/// Returns the number of 16-bit code units this character would need if
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/// encoded in UTF-16.
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///
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/// # Examples
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///
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/// ```
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/// let n = 'ß'.len_utf16();
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///
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/// assert_eq!(n, 1);
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn len_utf16(self) -> usize;
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/// Encodes this character as UTF-8 into the provided byte buffer, and then
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/// returns the number of bytes written.
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///
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/// If the buffer is not large enough, nothing will be written into it and a
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/// `None` will be returned. A buffer of length four is large enough to
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/// encode any `char`.
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///
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/// # Examples
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///
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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, Some(2));
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/// ```
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///
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/// A buffer that's too small:
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///
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/// ```
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/// let mut b = [0; 1];
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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, None);
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/// ```
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#[unstable(feature = "unicode",
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reason = "pending decision about Iterator/Writer/Reader")]
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fn encode_utf8(self, dst: &mut [u8]) -> Option<usize>;
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/// Encodes this character as UTF-16 into the provided `u16` buffer, and
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/// then returns the number of `u16`s written.
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///
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/// If the buffer is not large enough, nothing will be written into it and a
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/// `None` will be returned. A buffer of length 2 is large enough to encode
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/// any `char`.
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///
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/// # Examples
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///
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/// In both of these examples, 'ß' takes one `u16` to encode.
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///
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/// ```
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/// let mut b = [0; 1];
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///
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/// let result = 'ß'.encode_utf16(&mut b);
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///
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/// assert_eq!(result, Some(1));
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/// ```
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///
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/// A buffer that's too small:
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///
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/// ```
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/// let mut b = [0; 0];
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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, None);
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/// ```
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#[unstable(feature = "unicode",
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reason = "pending decision about Iterator/Writer/Reader")]
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fn encode_utf16(self, dst: &mut [u16]) -> Option<usize>;
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/// Returns whether the specified character is considered a Unicode
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/// alphabetic code point.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_alphabetic(self) -> bool;
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/// Returns whether the specified character satisfies the 'XID_Start'
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/// Unicode property.
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///
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/// 'XID_Start' is a Unicode Derived Property specified in
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/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
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/// mostly similar to ID_Start but modified for closure under NFKx.
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#[unstable(feature = "unicode",
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reason = "mainly needed for compiler internals")]
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fn is_xid_start(self) -> bool;
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/// Returns whether the specified `char` satisfies the 'XID_Continue'
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/// Unicode property.
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///
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/// 'XID_Continue' is a Unicode Derived Property specified in
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/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
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/// mostly similar to 'ID_Continue' but modified for closure under NFKx.
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#[unstable(feature = "unicode",
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reason = "mainly needed for compiler internals")]
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fn is_xid_continue(self) -> bool;
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/// Indicates whether a character is in lowercase.
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///
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/// This is defined according to the terms of the Unicode Derived Core
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/// Property `Lowercase`.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_lowercase(self) -> bool;
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/// Indicates whether a character is in uppercase.
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///
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/// This is defined according to the terms of the Unicode Derived Core
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/// Property `Uppercase`.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_uppercase(self) -> bool;
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/// Indicates whether a character is whitespace.
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///
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/// Whitespace is defined in terms of the Unicode Property `White_Space`.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_whitespace(self) -> bool;
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/// Indicates whether a character is alphanumeric.
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///
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/// Alphanumericness is defined in terms of the Unicode General Categories
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/// 'Nd', 'Nl', 'No' and the Derived Core Property 'Alphabetic'.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_alphanumeric(self) -> bool;
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/// Indicates whether a character is a control code point.
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///
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/// Control code points are defined in terms of the Unicode General
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/// Category `Cc`.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_control(self) -> bool;
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/// Indicates whether the character is numeric (Nd, Nl, or No).
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#[stable(feature = "rust1", since = "1.0.0")]
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fn is_numeric(self) -> bool;
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/// Converts a character to its lowercase equivalent.
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///
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/// The case-folding performed is the common or simple mapping. See
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/// `to_uppercase()` for references and more information.
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///
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/// # Return value
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///
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/// Returns an iterator which yields the characters corresponding to the
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/// lowercase equivalent of the character. If no conversion is possible then
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/// the input character is returned.
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_lowercase(self) -> ToLowercase;
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/// Converts a character to its uppercase equivalent.
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///
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/// The case-folding performed is the common or simple mapping: it maps
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/// one Unicode codepoint to its uppercase equivalent according to the
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/// Unicode database [1]. The additional [`SpecialCasing.txt`] is not yet
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/// considered here, but the iterator returned will soon support this form
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/// of case folding.
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///
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/// A full reference can be found here [2].
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///
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/// # Return value
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///
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/// Returns an iterator which yields the characters corresponding to the
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/// uppercase equivalent of the character. If no conversion is possible then
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/// the input character is returned.
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///
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/// [1]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
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///
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/// [`SpecialCasing`.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt
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///
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/// [2]: http://www.unicode.org/versions/Unicode4.0.0/ch03.pdf#G33992
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#[stable(feature = "rust1", since = "1.0.0")]
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fn to_uppercase(self) -> ToUppercase;
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/// Returns this character's displayed width in columns, or `None` if it is a
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/// control character other than `'\x00'`.
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///
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/// `is_cjk` determines behavior for characters in the Ambiguous category:
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/// if `is_cjk` is `true`, these are 2 columns wide; otherwise, they are 1.
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/// In CJK contexts, `is_cjk` should be `true`, else it should be `false`.
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/// [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/)
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/// recommends that these characters be treated as 1 column (i.e.,
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/// `is_cjk` = `false`) if the context cannot be reliably determined.
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#[unstable(feature = "unicode",
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reason = "needs expert opinion. is_cjk flag stands out as ugly")]
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fn width(self, is_cjk: bool) -> Option<usize>;
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}
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#[cfg(stage0)]
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#[stable(feature = "rust1", since = "1.0.0")]
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impl CharExt for char {
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#[inline]
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fn is_digit(self, radix: u32) -> bool { C::is_digit(self, radix) }
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fn to_digit(self, radix: u32) -> Option<u32> { C::to_digit(self, radix) }
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fn escape_unicode(self) -> EscapeUnicode { C::escape_unicode(self) }
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fn escape_default(self) -> EscapeDefault { C::escape_default(self) }
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fn len_utf8(self) -> usize { C::len_utf8(self) }
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fn len_utf16(self) -> usize { C::len_utf16(self) }
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fn encode_utf8(self, dst: &mut [u8]) -> Option<usize> { C::encode_utf8(self, dst) }
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fn encode_utf16(self, dst: &mut [u16]) -> Option<usize> { C::encode_utf16(self, dst) }
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#[inline]
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fn is_alphabetic(self) -> bool {
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match self {
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'a' ... 'z' | 'A' ... 'Z' => true,
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c if c > '\x7f' => derived_property::Alphabetic(c),
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_ => false
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}
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}
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#[inline]
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fn is_xid_start(self) -> bool { derived_property::XID_Start(self) }
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#[inline]
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fn is_xid_continue(self) -> bool { derived_property::XID_Continue(self) }
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#[inline]
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fn is_lowercase(self) -> bool {
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match self {
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'a' ... 'z' => true,
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c if c > '\x7f' => derived_property::Lowercase(c),
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_ => false
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}
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}
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#[inline]
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fn is_uppercase(self) -> bool {
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match self {
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'A' ... 'Z' => true,
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c if c > '\x7f' => derived_property::Uppercase(c),
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_ => false
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}
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}
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#[inline]
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fn is_whitespace(self) -> bool {
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match self {
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' ' | '\x09' ... '\x0d' => true,
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c if c > '\x7f' => property::White_Space(c),
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_ => false
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}
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}
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#[inline]
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fn is_alphanumeric(self) -> bool {
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self.is_alphabetic() || self.is_numeric()
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}
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#[inline]
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fn is_control(self) -> bool { general_category::Cc(self) }
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#[inline]
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fn is_numeric(self) -> bool {
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match self {
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'0' ... '9' => true,
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c if c > '\x7f' => general_category::N(c),
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_ => false
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}
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}
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#[inline]
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fn to_lowercase(self) -> ToLowercase {
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ToLowercase(Some(conversions::to_lower(self)))
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}
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#[inline]
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fn to_uppercase(self) -> ToUppercase {
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ToUppercase(Some(conversions::to_upper(self)))
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}
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#[inline]
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fn width(self, is_cjk: bool) -> Option<usize> { charwidth::width(self, is_cjk) }
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}
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/// An iterator over the lowercase mapping of a given character, returned from
|
||||
/// the `lowercase` method on characters.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
@ -90,6 +510,7 @@ impl char {
|
||||
/// assert!('f'.is_digit(16));
|
||||
/// ```
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_digit(self, radix: u32) -> bool { C::is_digit(self, radix) }
|
||||
|
||||
/// Converts a character to the corresponding digit.
|
||||
@ -285,6 +706,7 @@ impl char {
|
||||
/// Returns whether the specified character is considered a Unicode
|
||||
/// alphabetic code point.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_alphabetic(self) -> bool {
|
||||
match self {
|
||||
'a' ... 'z' | 'A' ... 'Z' => true,
|
||||
@ -301,6 +723,7 @@ impl char {
|
||||
/// mostly similar to ID_Start but modified for closure under NFKx.
|
||||
#[unstable(feature = "unicode",
|
||||
reason = "mainly needed for compiler internals")]
|
||||
#[inline]
|
||||
pub fn is_xid_start(self) -> bool { derived_property::XID_Start(self) }
|
||||
|
||||
/// Returns whether the specified `char` satisfies the 'XID_Continue'
|
||||
@ -311,6 +734,7 @@ impl char {
|
||||
/// mostly similar to 'ID_Continue' but modified for closure under NFKx.
|
||||
#[unstable(feature = "unicode",
|
||||
reason = "mainly needed for compiler internals")]
|
||||
#[inline]
|
||||
pub fn is_xid_continue(self) -> bool { derived_property::XID_Continue(self) }
|
||||
|
||||
/// Indicates whether a character is in lowercase.
|
||||
@ -318,6 +742,7 @@ impl char {
|
||||
/// This is defined according to the terms of the Unicode Derived Core
|
||||
/// Property `Lowercase`.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_lowercase(self) -> bool {
|
||||
match self {
|
||||
'a' ... 'z' => true,
|
||||
@ -331,6 +756,7 @@ impl char {
|
||||
/// This is defined according to the terms of the Unicode Derived Core
|
||||
/// Property `Uppercase`.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_uppercase(self) -> bool {
|
||||
match self {
|
||||
'A' ... 'Z' => true,
|
||||
@ -343,6 +769,7 @@ impl char {
|
||||
///
|
||||
/// Whitespace is defined in terms of the Unicode Property `White_Space`.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_whitespace(self) -> bool {
|
||||
match self {
|
||||
' ' | '\x09' ... '\x0d' => true,
|
||||
@ -356,6 +783,7 @@ impl char {
|
||||
/// Alphanumericness is defined in terms of the Unicode General Categories
|
||||
/// 'Nd', 'Nl', 'No' and the Derived Core Property 'Alphabetic'.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_alphanumeric(self) -> bool {
|
||||
self.is_alphabetic() || self.is_numeric()
|
||||
}
|
||||
@ -365,10 +793,12 @@ impl char {
|
||||
/// Control code points are defined in terms of the Unicode General
|
||||
/// Category `Cc`.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_control(self) -> bool { general_category::Cc(self) }
|
||||
|
||||
/// Indicates whether the character is numeric (Nd, Nl, or No).
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn is_numeric(self) -> bool {
|
||||
match self {
|
||||
'0' ... '9' => true,
|
||||
@ -388,6 +818,7 @@ impl char {
|
||||
/// lowercase equivalent of the character. If no conversion is possible then
|
||||
/// the input character is returned.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn to_lowercase(self) -> ToLowercase {
|
||||
ToLowercase(Some(conversions::to_lower(self)))
|
||||
}
|
||||
@ -414,6 +845,7 @@ impl char {
|
||||
///
|
||||
/// [2]: http://www.unicode.org/versions/Unicode4.0.0/ch03.pdf#G33992
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
#[inline]
|
||||
pub fn to_uppercase(self) -> ToUppercase {
|
||||
ToUppercase(Some(conversions::to_upper(self)))
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user