<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libcore/char/methods.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>methods.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! impl char {}</span>
<span class="kw">use</span> <span class="ident">slice</span>;
<span class="kw">use</span> <span class="ident">str</span>::<span class="ident">from_utf8_unchecked_mut</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">unicode</span>::<span class="ident">printable</span>::<span class="ident">is_printable</span>;
<span class="kw">use</span> <span class="ident">unicode</span>::<span class="ident">tables</span>::{<span class="ident">conversions</span>, <span class="ident">derived_property</span>, <span class="ident">general_category</span>, <span class="ident">property</span>};
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"char"</span>]</span>
<span class="kw">impl</span> <span class="ident">char</span> {
<span class="doccomment">/// Checks if a `char` is a digit in the given radix.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A 'radix' here is sometimes also called a 'base'. A radix of two</span>
<span class="doccomment">/// indicates a binary number, a radix of ten, decimal, and a radix of</span>
<span class="doccomment">/// sixteen, hexadecimal, to give some common values. Arbitrary</span>
<span class="doccomment">/// radices are supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Compared to `is_numeric()`, this function only recognizes the characters</span>
<span class="doccomment">/// `0-9`, `a-z` and `A-Z`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Digit' is defined to be only the following characters:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `0-9`</span>
<span class="doccomment">/// * `a-z`</span>
<span class="doccomment">/// * `A-Z`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For a more comprehensive understanding of 'digit', see [`is_numeric`][is_numeric].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [is_numeric]: #method.is_numeric</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if given a radix larger than 36.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!('1'.is_digit(10));</span>
<span class="doccomment">/// assert!('f'.is_digit(16));</span>
<span class="doccomment">/// assert!(!'f'.is_digit(10));</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Passing a large radix, causing a panic:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(|| {</span>
<span class="doccomment">/// // this panics</span>
<span class="doccomment">/// '1'.is_digit(37);</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_digit</span>(<span class="self">self</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">to_digit</span>(<span class="ident">radix</span>).<span class="ident">is_some</span>()
}
<span class="doccomment">/// Converts a `char` to a digit in the given radix.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A 'radix' here is sometimes also called a 'base'. A radix of two</span>
<span class="doccomment">/// indicates a binary number, a radix of ten, decimal, and a radix of</span>
<span class="doccomment">/// sixteen, hexadecimal, to give some common values. Arbitrary</span>
<span class="doccomment">/// radices are supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Digit' is defined to be only the following characters:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `0-9`</span>
<span class="doccomment">/// * `a-z`</span>
<span class="doccomment">/// * `A-Z`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if the `char` does not refer to a digit in the given radix.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if given a radix larger than 36.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('1'.to_digit(10), Some(1));</span>
<span class="doccomment">/// assert_eq!('f'.to_digit(16), Some(15));</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Passing a non-digit results in failure:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('f'.to_digit(10), None);</span>
<span class="doccomment">/// assert_eq!('z'.to_digit(16), None);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Passing a large radix, causing a panic:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(|| {</span>
<span class="doccomment">/// '1'.to_digit(37);</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_digit</span>(<span class="self">self</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">radix</span> <span class="op">></span> <span class="number">36</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"to_digit: radix is too high (maximum 36)"</span>);
}
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
<span class="string">'0'</span> ... <span class="string">'9'</span> <span class="op">=></span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">-</span> <span class="string">'0'</span> <span class="kw">as</span> <span class="ident">u32</span>,
<span class="string">'a'</span> ... <span class="string">'z'</span> <span class="op">=></span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">-</span> <span class="string">'a'</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">+</span> <span class="number">10</span>,
<span class="string">'A'</span> ... <span class="string">'Z'</span> <span class="op">=></span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">-</span> <span class="string">'A'</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">+</span> <span class="number">10</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="kw">if</span> <span class="ident">val</span> <span class="op"><</span> <span class="ident">radix</span> { <span class="prelude-val">Some</span>(<span class="ident">val</span>) }
<span class="kw">else</span> { <span class="prelude-val">None</span> }
}
<span class="doccomment">/// Returns an iterator that yields the hexadecimal Unicode escape of a</span>
<span class="doccomment">/// character as `char`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will escape characters with the Rust syntax of the form</span>
<span class="doccomment">/// `\u{NNNNNN}` where `NNNNNN` is a hexadecimal representation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As an iterator:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// for c in '❤'.escape_unicode() {</span>
<span class="doccomment">/// print!("{}", c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// println!();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `println!` directly:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("{}", '❤'.escape_unicode());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both are equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("\\u{{2764}}");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `to_string`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('❤'.escape_unicode().to_string(), "\\u{2764}");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">escape_unicode</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">EscapeUnicode</span> {
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="comment">// or-ing 1 ensures that for c==0 the code computes that one</span>
<span class="comment">// digit should be printed and (which is the same) avoids the</span>
<span class="comment">// (31 - 32) underflow</span>
<span class="kw">let</span> <span class="ident">msb</span> <span class="op">=</span> <span class="number">31</span> <span class="op">-</span> (<span class="ident">c</span> <span class="op">|</span> <span class="number">1</span>).<span class="ident">leading_zeros</span>();
<span class="comment">// the index of the most significant hex digit</span>
<span class="kw">let</span> <span class="ident">ms_hex_digit</span> <span class="op">=</span> <span class="ident">msb</span> <span class="op">/</span> <span class="number">4</span>;
<span class="ident">EscapeUnicode</span> {
<span class="ident">c</span>: <span class="self">self</span>,
<span class="ident">state</span>: <span class="ident">EscapeUnicodeState</span>::<span class="ident">Backslash</span>,
<span class="ident">hex_digit_idx</span>: <span class="ident">ms_hex_digit</span> <span class="kw">as</span> <span class="ident">usize</span>,
}
}
<span class="doccomment">/// An extended version of `escape_debug` that optionally permits escaping</span>
<span class="doccomment">/// Extended Grapheme codepoints. This allows us to format characters like</span>
<span class="doccomment">/// nonspacing marks better when they're at the start of a string.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"str_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">escape_debug_ext</span>(<span class="self">self</span>, <span class="ident">escape_grapheme_extended</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">EscapeDebug</span> {
<span class="kw">let</span> <span class="ident">init_state</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
<span class="string">'\t'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'t'</span>),
<span class="string">'\r'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'r'</span>),
<span class="string">'\n'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'n'</span>),
<span class="string">'\\'</span> <span class="op">|</span> <span class="string">'\''</span> <span class="op">|</span> <span class="string">'"'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="self">self</span>),
<span class="kw">_</span> <span class="kw">if</span> <span class="ident">escape_grapheme_extended</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">is_grapheme_extended</span>() <span class="op">=></span> {
<span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="self">self</span>.<span class="ident">escape_unicode</span>())
}
<span class="kw">_</span> <span class="kw">if</span> <span class="ident">is_printable</span>(<span class="self">self</span>) <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="self">self</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="self">self</span>.<span class="ident">escape_unicode</span>()),
};
<span class="ident">EscapeDebug</span>(<span class="ident">EscapeDefault</span> { <span class="ident">state</span>: <span class="ident">init_state</span> })
}
<span class="doccomment">/// Returns an iterator that yields the literal escape code of a character</span>
<span class="doccomment">/// as `char`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will escape the characters similar to the `Debug` implementations</span>
<span class="doccomment">/// of `str` or `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As an iterator:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// for c in '\n'.escape_debug() {</span>
<span class="doccomment">/// print!("{}", c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// println!();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `println!` directly:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("{}", '\n'.escape_debug());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both are equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("\\n");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `to_string`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('\n'.escape_debug().to_string(), "\\n");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_escape_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">escape_debug</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">EscapeDebug</span> {
<span class="self">self</span>.<span class="ident">escape_debug_ext</span>(<span class="bool-val">true</span>)
}
<span class="doccomment">/// Returns an iterator that yields the literal escape code of a character</span>
<span class="doccomment">/// as `char`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default is chosen with a bias toward producing literals that are</span>
<span class="doccomment">/// legal in a variety of languages, including C++11 and similar C-family</span>
<span class="doccomment">/// languages. The exact rules are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Tab is escaped as `\t`.</span>
<span class="doccomment">/// * Carriage return is escaped as `\r`.</span>
<span class="doccomment">/// * Line feed is escaped as `\n`.</span>
<span class="doccomment">/// * Single quote is escaped as `\'`.</span>
<span class="doccomment">/// * Double quote is escaped as `\"`.</span>
<span class="doccomment">/// * Backslash is escaped as `\\`.</span>
<span class="doccomment">/// * Any character in the 'printable ASCII' range `0x20` .. `0x7e`</span>
<span class="doccomment">/// inclusive is not escaped.</span>
<span class="doccomment">/// * All other characters are given hexadecimal Unicode escapes; see</span>
<span class="doccomment">/// [`escape_unicode`][escape_unicode].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [escape_unicode]: #method.escape_unicode</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As an iterator:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// for c in '"'.escape_default() {</span>
<span class="doccomment">/// print!("{}", c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// println!();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `println!` directly:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("{}", '"'.escape_default());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both are equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("\\\"");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `to_string`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('"'.escape_default().to_string(), "\\\"");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">escape_default</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">EscapeDefault</span> {
<span class="kw">let</span> <span class="ident">init_state</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
<span class="string">'\t'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'t'</span>),
<span class="string">'\r'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'r'</span>),
<span class="string">'\n'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="string">'n'</span>),
<span class="string">'\\'</span> <span class="op">|</span> <span class="string">'\''</span> <span class="op">|</span> <span class="string">'"'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="self">self</span>),
<span class="string">'\x20'</span> ... <span class="string">'\x7e'</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="self">self</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="self">self</span>.<span class="ident">escape_unicode</span>())
};
<span class="ident">EscapeDefault</span> { <span class="ident">state</span>: <span class="ident">init_state</span> }
}
<span class="doccomment">/// Returns the number of bytes this `char` would need if encoded in UTF-8.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// That number of bytes is always between 1 and 4, inclusive.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let len = 'A'.len_utf8();</span>
<span class="doccomment">/// assert_eq!(len, 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let len = 'ß'.len_utf8();</span>
<span class="doccomment">/// assert_eq!(len, 2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let len = 'ℝ'.len_utf8();</span>
<span class="doccomment">/// assert_eq!(len, 3);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let len = '💣'.len_utf8();</span>
<span class="doccomment">/// assert_eq!(len, 4);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `&str` type guarantees that its contents are UTF-8, and so we can compare the length it</span>
<span class="doccomment">/// would take if each code point was represented as a `char` vs in the `&str` itself:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// // as chars</span>
<span class="doccomment">/// let eastern = '東';</span>
<span class="doccomment">/// let capitol = '京';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // both can be represented as three bytes</span>
<span class="doccomment">/// assert_eq!(3, eastern.len_utf8());</span>
<span class="doccomment">/// assert_eq!(3, capitol.len_utf8());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // as a &str, these two are encoded in UTF-8</span>
<span class="doccomment">/// let tokyo = "東京";</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let len = eastern.len_utf8() + capitol.len_utf8();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can see that they take six bytes total...</span>
<span class="doccomment">/// assert_eq!(6, tokyo.len());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // ... just like the &str</span>
<span class="doccomment">/// assert_eq!(len, tokyo.len());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len_utf8</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_ONE_B</span> {
<span class="number">1</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_TWO_B</span> {
<span class="number">2</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_THREE_B</span> {
<span class="number">3</span>
} <span class="kw">else</span> {
<span class="number">4</span>
}
}
<span class="doccomment">/// Returns the number of 16-bit code units this `char` would need if</span>
<span class="doccomment">/// encoded in UTF-16.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the documentation for [`len_utf8`] for more explanation of this</span>
<span class="doccomment">/// concept. This function is a mirror, but for UTF-16 instead of UTF-8.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`len_utf8`]: #method.len_utf8</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let n = 'ß'.len_utf16();</span>
<span class="doccomment">/// assert_eq!(n, 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let len = '💣'.len_utf16();</span>
<span class="doccomment">/// assert_eq!(len, 2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len_utf16</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">ch</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">if</span> (<span class="ident">ch</span> <span class="op">&</span> <span class="number">0xFFFF</span>) <span class="op">==</span> <span class="ident">ch</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">2</span> }
}
<span class="doccomment">/// Encodes this character as UTF-8 into the provided byte buffer,</span>
<span class="doccomment">/// and then returns the subslice of the buffer that contains the encoded character.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the buffer is not large enough.</span>
<span class="doccomment">/// A buffer of length four is large enough to encode any `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In both of these examples, 'ß' takes two bytes to encode.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut b = [0; 2];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = 'ß'.encode_utf8(&mut b);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(result, "ß");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(result.len(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A buffer that's too small:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(|| {</span>
<span class="doccomment">/// let mut b = [0; 1];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this panics</span>
<span class="doccomment">/// 'ß'.encode_utf8(&mut b);</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"unicode_encode_char"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode_utf8</span>(<span class="self">self</span>, <span class="ident">dst</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">str</span> {
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span>
<span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_ONE_B</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">dst</span>.<span class="ident">is_empty</span>() {
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> <span class="ident">code</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="number">1</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_TWO_B</span> <span class="op">&&</span> <span class="ident">dst</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">2</span> {
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x1F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_TWO_B</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">1</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="number">2</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_THREE_B</span> <span class="op">&&</span> <span class="ident">dst</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">3</span> {
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">12</span> <span class="op">&</span> <span class="number">0x0F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_THREE_B</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">1</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">2</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="number">3</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">dst</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">4</span> {
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">18</span> <span class="op">&</span> <span class="number">0x07</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_FOUR_B</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">1</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">12</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">2</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">3</span>) <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="number">4</span>
} <span class="kw">else</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"encode_utf8: need {} bytes to encode U+{:X}, but the buffer has {}"</span>,
<span class="ident">from_u32_unchecked</span>(<span class="ident">code</span>).<span class="ident">len_utf8</span>(),
<span class="ident">code</span>,
<span class="ident">dst</span>.<span class="ident">len</span>())
};
<span class="ident">from_utf8_unchecked_mut</span>(<span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(..<span class="ident">len</span>))
}
}
<span class="doccomment">/// Encodes this character as UTF-16 into the provided `u16` buffer,</span>
<span class="doccomment">/// and then returns the subslice of the buffer that contains the encoded character.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the buffer is not large enough.</span>
<span class="doccomment">/// A buffer of length 2 is large enough to encode any `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In both of these examples, '𝕊' takes two `u16`s to encode.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut b = [0; 2];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = '𝕊'.encode_utf16(&mut b);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(result.len(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A buffer that's too small:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(|| {</span>
<span class="doccomment">/// let mut b = [0; 1];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this panics</span>
<span class="doccomment">/// '𝕊'.encode_utf16(&mut b);</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"unicode_encode_char"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode_utf16</span>(<span class="self">self</span>, <span class="ident">dst</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u16</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u16</span>] {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">code</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">unsafe</span> {
<span class="kw">if</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0xFFFF</span>) <span class="op">==</span> <span class="ident">code</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">dst</span>.<span class="ident">is_empty</span>() {
<span class="comment">// The BMP falls through (assuming non-surrogate, as it should)</span>
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> <span class="ident">code</span> <span class="kw">as</span> <span class="ident">u16</span>;
<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">dst</span>.<span class="ident">as_mut_ptr</span>(), <span class="number">1</span>)
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">dst</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">2</span> {
<span class="comment">// Supplementary planes break into surrogates.</span>
<span class="ident">code</span> <span class="op">-=</span> <span class="number">0x1_0000</span>;
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>) <span class="op">=</span> <span class="number">0xD800</span> <span class="op">|</span> ((<span class="ident">code</span> <span class="op">>></span> <span class="number">10</span>) <span class="kw">as</span> <span class="ident">u16</span>);
<span class="kw-2">*</span><span class="ident">dst</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">1</span>) <span class="op">=</span> <span class="number">0xDC00</span> <span class="op">|</span> ((<span class="ident">code</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op">&</span> <span class="number">0x3FF</span>);
<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">dst</span>.<span class="ident">as_mut_ptr</span>(), <span class="number">2</span>)
} <span class="kw">else</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"encode_utf16: need {} units to encode U+{:X}, but the buffer has {}"</span>,
<span class="ident">from_u32_unchecked</span>(<span class="ident">code</span>).<span class="ident">len_utf16</span>(),
<span class="ident">code</span>,
<span class="ident">dst</span>.<span class="ident">len</span>())
}
}
}
<span class="doccomment">/// Returns true if this `char` is an alphabetic code point, and false if not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!('a'.is_alphabetic());</span>
<span class="doccomment">/// assert!('京'.is_alphabetic());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = '💝';</span>
<span class="doccomment">/// // love is many things, but it is not alphabetic</span>
<span class="doccomment">/// assert!(!c.is_alphabetic());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_alphabetic</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="string">'a'</span>...<span class="string">'z'</span> <span class="op">|</span> <span class="string">'A'</span>...<span class="string">'Z'</span> <span class="op">=></span> <span class="bool-val">true</span>,
<span class="ident">c</span> <span class="kw">if</span> <span class="ident">c</span> <span class="op">></span> <span class="string">'\x7f'</span> <span class="op">=></span> <span class="ident">derived_property</span>::<span class="ident">Alphabetic</span>(<span class="ident">c</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns true if this `char` satisfies the 'XID_Start' Unicode property, and false</span>
<span class="doccomment">/// otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'XID_Start' is a Unicode Derived Property specified in</span>
<span class="doccomment">/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),</span>
<span class="doccomment">/// mostly similar to `ID_Start` but modified for closure under `NFKx`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rustc_private"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"mainly needed for compiler internals"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27812"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_xid_start</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">derived_property</span>::<span class="ident">XID_Start</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Returns true if this `char` satisfies the 'XID_Continue' Unicode property, and false</span>
<span class="doccomment">/// otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'XID_Continue' is a Unicode Derived Property specified in</span>
<span class="doccomment">/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),</span>
<span class="doccomment">/// mostly similar to 'ID_Continue' but modified for closure under NFKx.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rustc_private"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"mainly needed for compiler internals"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27812"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_xid_continue</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">derived_property</span>::<span class="ident">XID_Continue</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Returns true if this `char` is lowercase, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Lowercase' is defined according to the terms of the Unicode Derived Core</span>
<span class="doccomment">/// Property `Lowercase`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!('a'.is_lowercase());</span>
<span class="doccomment">/// assert!('δ'.is_lowercase());</span>
<span class="doccomment">/// assert!(!'A'.is_lowercase());</span>
<span class="doccomment">/// assert!(!'Δ'.is_lowercase());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The various Chinese scripts do not have case, and so:</span>
<span class="doccomment">/// assert!(!'中'.is_lowercase());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_lowercase</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="string">'a'</span>...<span class="string">'z'</span> <span class="op">=></span> <span class="bool-val">true</span>,
<span class="ident">c</span> <span class="kw">if</span> <span class="ident">c</span> <span class="op">></span> <span class="string">'\x7f'</span> <span class="op">=></span> <span class="ident">derived_property</span>::<span class="ident">Lowercase</span>(<span class="ident">c</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns true if this `char` is uppercase, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Uppercase' is defined according to the terms of the Unicode Derived Core</span>
<span class="doccomment">/// Property `Uppercase`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!(!'a'.is_uppercase());</span>
<span class="doccomment">/// assert!(!'δ'.is_uppercase());</span>
<span class="doccomment">/// assert!('A'.is_uppercase());</span>
<span class="doccomment">/// assert!('Δ'.is_uppercase());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The various Chinese scripts do not have case, and so:</span>
<span class="doccomment">/// assert!(!'中'.is_uppercase());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_uppercase</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="string">'A'</span>...<span class="string">'Z'</span> <span class="op">=></span> <span class="bool-val">true</span>,
<span class="ident">c</span> <span class="kw">if</span> <span class="ident">c</span> <span class="op">></span> <span class="string">'\x7f'</span> <span class="op">=></span> <span class="ident">derived_property</span>::<span class="ident">Uppercase</span>(<span class="ident">c</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns true if this `char` is whitespace, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Whitespace' is defined according to the terms of the Unicode Derived Core</span>
<span class="doccomment">/// Property `White_Space`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!(' '.is_whitespace());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // a non-breaking space</span>
<span class="doccomment">/// assert!('\u{A0}'.is_whitespace());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!'越'.is_whitespace());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_whitespace</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="string">' '</span> <span class="op">|</span> <span class="string">'\x09'</span>...<span class="string">'\x0d'</span> <span class="op">=></span> <span class="bool-val">true</span>,
<span class="ident">c</span> <span class="kw">if</span> <span class="ident">c</span> <span class="op">></span> <span class="string">'\x7f'</span> <span class="op">=></span> <span class="ident">property</span>::<span class="ident">White_Space</span>(<span class="ident">c</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns true if this `char` is alphanumeric, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Alphanumeric'-ness is defined in terms of the Unicode General Categories</span>
<span class="doccomment">/// 'Nd', 'Nl', 'No' and the Derived Core Property 'Alphabetic'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!('٣'.is_alphanumeric());</span>
<span class="doccomment">/// assert!('7'.is_alphanumeric());</span>
<span class="doccomment">/// assert!('৬'.is_alphanumeric());</span>
<span class="doccomment">/// assert!('K'.is_alphanumeric());</span>
<span class="doccomment">/// assert!('و'.is_alphanumeric());</span>
<span class="doccomment">/// assert!('藏'.is_alphanumeric());</span>
<span class="doccomment">/// assert!(!'¾'.is_alphanumeric());</span>
<span class="doccomment">/// assert!(!'①'.is_alphanumeric());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_alphanumeric</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_alphabetic</span>() <span class="op">||</span> <span class="self">self</span>.<span class="ident">is_numeric</span>()
}
<span class="doccomment">/// Returns true if this `char` is a control code point, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Control code point' is defined in terms of the Unicode General</span>
<span class="doccomment">/// Category `Cc`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// // U+009C, STRING TERMINATOR</span>
<span class="doccomment">/// assert!(''.is_control());</span>
<span class="doccomment">/// assert!(!'q'.is_control());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_control</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">general_category</span>::<span class="ident">Cc</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Returns true if this `char` is an extended grapheme character, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Extended grapheme character' is defined in terms of the Unicode Shaping and Rendering</span>
<span class="doccomment">/// Category `Grapheme_Extend`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">is_grapheme_extended</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">derived_property</span>::<span class="ident">Grapheme_Extend</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Returns true if this `char` is numeric, and false otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 'Numeric'-ness is defined in terms of the Unicode General Categories</span>
<span class="doccomment">/// 'Nd', 'Nl', 'No'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert!('٣'.is_numeric());</span>
<span class="doccomment">/// assert!('7'.is_numeric());</span>
<span class="doccomment">/// assert!('৬'.is_numeric());</span>
<span class="doccomment">/// assert!(!'K'.is_numeric());</span>
<span class="doccomment">/// assert!(!'و'.is_numeric());</span>
<span class="doccomment">/// assert!(!'藏'.is_numeric());</span>
<span class="doccomment">/// assert!(!'¾'.is_numeric());</span>
<span class="doccomment">/// assert!(!'①'.is_numeric());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_numeric</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="string">'0'</span>...<span class="string">'9'</span> <span class="op">=></span> <span class="bool-val">true</span>,
<span class="ident">c</span> <span class="kw">if</span> <span class="ident">c</span> <span class="op">></span> <span class="string">'\x7f'</span> <span class="op">=></span> <span class="ident">general_category</span>::<span class="ident">N</span>(<span class="ident">c</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns an iterator that yields the lowercase equivalent of a `char`</span>
<span class="doccomment">/// as one or more `char`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a character does not have a lowercase equivalent, the same character</span>
<span class="doccomment">/// will be returned back by the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This performs complex unconditional mappings with no tailoring: it maps</span>
<span class="doccomment">/// one Unicode character to its lowercase equivalent according to the</span>
<span class="doccomment">/// [Unicode database] and the additional complex mappings</span>
<span class="doccomment">/// [`SpecialCasing.txt`]. Conditional mappings (based on context or</span>
<span class="doccomment">/// language) are not considered here.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For a full reference, see [here][reference].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As an iterator:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// for c in 'İ'.to_lowercase() {</span>
<span class="doccomment">/// print!("{}", c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// println!();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `println!` directly:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("{}", 'İ'.to_lowercase());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both are equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("i\u{307}");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `to_string`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('C'.to_lowercase().to_string(), "c");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Sometimes the result is more than one character:</span>
<span class="doccomment">/// assert_eq!('İ'.to_lowercase().to_string(), "i\u{307}");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Characters that do not have both uppercase and lowercase</span>
<span class="doccomment">/// // convert into themselves.</span>
<span class="doccomment">/// assert_eq!('山'.to_lowercase().to_string(), "山");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_lowercase</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">ToLowercase</span> {
<span class="ident">ToLowercase</span>(<span class="ident">CaseMappingIter</span>::<span class="ident">new</span>(<span class="ident">conversions</span>::<span class="ident">to_lower</span>(<span class="self">self</span>)))
}
<span class="doccomment">/// Returns an iterator that yields the uppercase equivalent of a `char`</span>
<span class="doccomment">/// as one or more `char`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a character does not have an uppercase equivalent, the same character</span>
<span class="doccomment">/// will be returned back by the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This performs complex unconditional mappings with no tailoring: it maps</span>
<span class="doccomment">/// one Unicode character to its uppercase equivalent according to the</span>
<span class="doccomment">/// [Unicode database] and the additional complex mappings</span>
<span class="doccomment">/// [`SpecialCasing.txt`]. Conditional mappings (based on context or</span>
<span class="doccomment">/// language) are not considered here.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For a full reference, see [here][reference].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Unicode database]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`SpecialCasing.txt`]: ftp://ftp.unicode.org/Public/UNIDATA/SpecialCasing.txt</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [reference]: http://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G33992</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As an iterator:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// for c in 'ß'.to_uppercase() {</span>
<span class="doccomment">/// print!("{}", c);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// println!();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `println!` directly:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("{}", 'ß'.to_uppercase());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Both are equivalent to:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// println!("SS");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using `to_string`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// assert_eq!('c'.to_uppercase().to_string(), "C");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Sometimes the result is more than one character:</span>
<span class="doccomment">/// assert_eq!('ß'.to_uppercase().to_string(), "SS");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Characters that do not have both uppercase and lowercase</span>
<span class="doccomment">/// // convert into themselves.</span>
<span class="doccomment">/// assert_eq!('山'.to_uppercase().to_string(), "山");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note on locale</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In Turkish, the equivalent of 'i' in Latin has five forms instead of two:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * 'Dotless': I / ı, sometimes written ï</span>
<span class="doccomment">/// * 'Dotted': İ / i</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the lowercase dotted 'i' is the same as the Latin. Therefore:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let upper_i = 'i'.to_uppercase().to_string();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value of `upper_i` here relies on the language of the text: if we're</span>
<span class="doccomment">/// in `en-US`, it should be `"I"`, but if we're in `tr_TR`, it should</span>
<span class="doccomment">/// be `"İ"`. `to_uppercase()` does not take this into account, and so:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let upper_i = 'i'.to_uppercase().to_string();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(upper_i, "I");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// holds across languages.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_uppercase</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">ToUppercase</span> {
<span class="ident">ToUppercase</span>(<span class="ident">CaseMappingIter</span>::<span class="ident">new</span>(<span class="ident">conversions</span>::<span class="ident">to_upper</span>(<span class="self">self</span>)))
}
<span class="doccomment">/// Checks if the value is within the ASCII range.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ascii = 'a';</span>
<span class="doccomment">/// let non_ascii = '❤';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(ascii.is_ascii());</span>
<span class="doccomment">/// assert!(!non_ascii.is_ascii());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op"><=</span> <span class="number">0x7F</span>
}
<span class="doccomment">/// Makes a copy of the value in its ASCII upper case equivalent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To uppercase the value in-place, use [`make_ascii_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To uppercase ASCII characters in addition to non-ASCII characters, use</span>
<span class="doccomment">/// [`to_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ascii = 'a';</span>
<span class="doccomment">/// let non_ascii = '❤';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!('A', ascii.to_ascii_uppercase());</span>
<span class="doccomment">/// assert_eq!('❤', non_ascii.to_ascii_uppercase());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`make_ascii_uppercase`]: #method.make_ascii_uppercase</span>
<span class="doccomment">/// [`to_uppercase`]: #method.to_uppercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_ascii_uppercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_ascii</span>() {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">to_ascii_uppercase</span>() <span class="kw">as</span> <span class="ident">char</span>
} <span class="kw">else</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="doccomment">/// Makes a copy of the value in its ASCII lower case equivalent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To lowercase the value in-place, use [`make_ascii_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To lowercase ASCII characters in addition to non-ASCII characters, use</span>
<span class="doccomment">/// [`to_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let ascii = 'A';</span>
<span class="doccomment">/// let non_ascii = '❤';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!('a', ascii.to_ascii_lowercase());</span>
<span class="doccomment">/// assert_eq!('❤', non_ascii.to_ascii_lowercase());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`make_ascii_lowercase`]: #method.make_ascii_lowercase</span>
<span class="doccomment">/// [`to_lowercase`]: #method.to_lowercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_ascii_lowercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_ascii</span>() {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">to_ascii_lowercase</span>() <span class="kw">as</span> <span class="ident">char</span>
} <span class="kw">else</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="doccomment">/// Checks that two values are an ASCII case-insensitive match.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to `to_ascii_lowercase(a) == to_ascii_lowercase(b)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let upper_a = 'A';</span>
<span class="doccomment">/// let lower_a = 'a';</span>
<span class="doccomment">/// let lower_z = 'z';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(upper_a.eq_ignore_ascii_case(&lower_a));</span>
<span class="doccomment">/// assert!(upper_a.eq_ignore_ascii_case(&upper_a));</span>
<span class="doccomment">/// assert!(!upper_a.eq_ignore_ascii_case(&lower_z));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">to_ascii_lowercase</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">to_ascii_lowercase</span>()
}
<span class="doccomment">/// Converts this type to its ASCII upper case equivalent in-place.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To return a new uppercased value without modifying the existing one, use</span>
<span class="doccomment">/// [`to_ascii_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut ascii = 'a';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ascii.make_ascii_uppercase();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!('A', ascii);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_ascii_uppercase`]: #method.to_ascii_uppercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">make_ascii_uppercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_uppercase</span>();
}
<span class="doccomment">/// Converts this type to its ASCII lower case equivalent in-place.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To return a new lowercased value without modifying the existing one, use</span>
<span class="doccomment">/// [`to_ascii_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut ascii = 'A';</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ascii.make_ascii_lowercase();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!('a', ascii);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_ascii_lowercase`]: #method.to_ascii_lowercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_methods_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.23.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">make_ascii_lowercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_lowercase</span>();
}
<span class="doccomment">/// Checks if the value is an ASCII alphabetic character:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - U+0041 'A' ... U+005A 'Z', or</span>
<span class="doccomment">/// - U+0061 'a' ... U+007A 'z'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(uppercase_a.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(uppercase_g.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(a.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(g.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(!space.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_alphabetic());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_alphabetic());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_alphabetic</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_alphabetic</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII uppercase character:</span>
<span class="doccomment">/// U+0041 'A' ... U+005A 'Z'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(uppercase_a.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(uppercase_g.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!a.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!g.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!space.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_uppercase());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_uppercase());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_uppercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_uppercase</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII lowercase character:</span>
<span class="doccomment">/// U+0061 'a' ... U+007A 'z'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!uppercase_a.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(a.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(g.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!space.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_lowercase());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_lowercase());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_lowercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_lowercase</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII alphanumeric character:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - U+0041 'A' ... U+005A 'Z', or</span>
<span class="doccomment">/// - U+0061 'a' ... U+007A 'z', or</span>
<span class="doccomment">/// - U+0030 '0' ... U+0039 '9'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(uppercase_a.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(uppercase_g.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(a.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(g.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(zero.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(!space.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_alphanumeric());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_alphanumeric());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_alphanumeric</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_alphanumeric</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII decimal digit:</span>
<span class="doccomment">/// U+0030 '0' ... U+0039 '9'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!uppercase_a.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!a.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!g.is_ascii_digit());</span>
<span class="doccomment">/// assert!(zero.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!space.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_digit());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_digit());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_digit</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_digit</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII hexadecimal digit:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - U+0030 '0' ... U+0039 '9', or</span>
<span class="doccomment">/// - U+0041 'A' ... U+0046 'F', or</span>
<span class="doccomment">/// - U+0061 'a' ... U+0066 'f'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(uppercase_a.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(a.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!g.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(zero.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!space.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_hexdigit());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_hexdigit());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_hexdigit</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_hexdigit</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII punctuation character:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - U+0021 ... U+002F `! " # $ % & ' ( ) * + , - . /`, or</span>
<span class="doccomment">/// - U+003A ... U+0040 `: ; < = > ? @`, or</span>
<span class="doccomment">/// - U+005B ... U+0060 ``[ \ ] ^ _ ` ``, or</span>
<span class="doccomment">/// - U+007B ... U+007E `{ | } ~`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!uppercase_a.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!a.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!g.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(percent.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!space.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_punctuation());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_punctuation());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_punctuation</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_punctuation</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII graphic character:</span>
<span class="doccomment">/// U+0021 '!' ... U+007E '~'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(uppercase_a.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(uppercase_g.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(a.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(g.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(zero.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(percent.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(!space.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(!lf.is_ascii_graphic());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_graphic());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_graphic</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_graphic</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII whitespace character:</span>
<span class="doccomment">/// U+0020 SPACE, U+0009 HORIZONTAL TAB, U+000A LINE FEED,</span>
<span class="doccomment">/// U+000C FORM FEED, or U+000D CARRIAGE RETURN.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Rust uses the WhatWG Infra Standard's [definition of ASCII</span>
<span class="doccomment">/// whitespace][infra-aw]. There are several other definitions in</span>
<span class="doccomment">/// wide use. For instance, [the POSIX locale][pct] includes</span>
<span class="doccomment">/// U+000B VERTICAL TAB as well as all the above characters,</span>
<span class="doccomment">/// but—from the very same specification—[the default rule for</span>
<span class="doccomment">/// "field splitting" in the Bourne shell][bfs] considers *only*</span>
<span class="doccomment">/// SPACE, HORIZONTAL TAB, and LINE FEED as whitespace.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If you are writing a program that will process an existing</span>
<span class="doccomment">/// file format, check what that format's definition of whitespace is</span>
<span class="doccomment">/// before using this function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [infra-aw]: https://infra.spec.whatwg.org/#ascii-whitespace</span>
<span class="doccomment">/// [pct]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_03_01</span>
<span class="doccomment">/// [bfs]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!uppercase_a.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!a.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!g.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(space.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(lf.is_ascii_whitespace());</span>
<span class="doccomment">/// assert!(!esc.is_ascii_whitespace());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_whitespace</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_whitespace</span>()
}
<span class="doccomment">/// Checks if the value is an ASCII control character:</span>
<span class="doccomment">/// U+0000 NUL ... U+001F UNIT SEPARATOR, or U+007F DELETE.</span>
<span class="doccomment">/// Note that most ASCII whitespace characters are control</span>
<span class="doccomment">/// characters, but SPACE is not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(ascii_ctype)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uppercase_a = 'A';</span>
<span class="doccomment">/// let uppercase_g = 'G';</span>
<span class="doccomment">/// let a = 'a';</span>
<span class="doccomment">/// let g = 'g';</span>
<span class="doccomment">/// let zero = '0';</span>
<span class="doccomment">/// let percent = '%';</span>
<span class="doccomment">/// let space = ' ';</span>
<span class="doccomment">/// let lf = '\n';</span>
<span class="doccomment">/// let esc: char = 0x1b_u8.into();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!uppercase_a.is_ascii_control());</span>
<span class="doccomment">/// assert!(!uppercase_g.is_ascii_control());</span>
<span class="doccomment">/// assert!(!a.is_ascii_control());</span>
<span class="doccomment">/// assert!(!g.is_ascii_control());</span>
<span class="doccomment">/// assert!(!zero.is_ascii_control());</span>
<span class="doccomment">/// assert!(!percent.is_ascii_control());</span>
<span class="doccomment">/// assert!(!space.is_ascii_control());</span>
<span class="doccomment">/// assert!(lf.is_ascii_control());</span>
<span class="doccomment">/// assert!(esc.is_ascii_control());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii_ctype_on_intrinsics"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ascii_control</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">is_ascii</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">is_ascii_control</span>()
}
}
</pre>
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distrib
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Mageia
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6
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armv7hl
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media
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core-updates
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4e2dbb669434a7691662cb2f0ad38972
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