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<span id="1069">1069</span>
</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">//! A character type.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `char` type represents a single character. More specifically, since</span>
<span class="doccomment">//! 'character' isn't a well-defined concept in Unicode, `char` is a '[Unicode</span>
<span class="doccomment">//! scalar value]', which is similar to, but not the same as, a '[Unicode code</span>
<span class="doccomment">//! point]'.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [Unicode scalar value]: http://www.unicode.org/glossary/#unicode_scalar_value</span>
<span class="doccomment">//! [Unicode code point]: http://www.unicode.org/glossary/#code_point</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module exists for technical reasons, the primary documentation for</span>
<span class="doccomment">//! `char` is directly on [the `char` primitive type](../../std/primitive.char.html)</span>
<span class="doccomment">//! itself.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module is the home of the iterator implementations for the iterators</span>
<span class="doccomment">//! implemented on `char`, as well as some useful constants and conversion</span>
<span class="doccomment">//! functions that convert various types to `char`.</span>
<span class="attribute">#<span class="op">!</span>[<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="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>::<span class="ident">CharExt</span> <span class="kw">as</span> <span class="ident">C</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::<span class="ident">FusedIterator</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Write</span>};
<span class="kw">use</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="comment">// stable reexports</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="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>::{<span class="ident">MAX</span>, <span class="ident">from_digit</span>, <span class="ident">from_u32</span>, <span class="ident">from_u32_unchecked</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="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>::{<span class="ident">EscapeDebug</span>, <span class="ident">EscapeDefault</span>, <span class="ident">EscapeUnicode</span>};
<span class="comment">// unstable reexports</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_from"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33417"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>::<span class="ident">CharTryFromError</span>;
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf8"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33906"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>::{<span class="ident">DecodeUtf8</span>, <span class="ident">decode_utf8</span>};
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"unicode"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27783"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">UNICODE_VERSION</span>;
<span class="doccomment">/// Returns an iterator that yields the lowercase equivalent of a `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`to_lowercase`] method on [`char`]. See</span>
<span class="doccomment">/// its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_lowercase`]: ../../std/primitive.char.html#method.to_lowercase</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</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="kw">pub</span> <span class="kw">struct</span> <span class="ident">ToLowercase</span>(<span class="ident">CaseMappingIter</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="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ToLowercase</span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>()
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span>
<span class="kw">impl</span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ToLowercase</span> {}
<span class="doccomment">/// Returns an iterator that yields the uppercase equivalent of a `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`to_uppercase`] method on [`char`]. See</span>
<span class="doccomment">/// its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_uppercase`]: ../../std/primitive.char.html#method.to_uppercase</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</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="kw">pub</span> <span class="kw">struct</span> <span class="ident">ToUppercase</span>(<span class="ident">CaseMappingIter</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="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ToUppercase</span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>()
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span>
<span class="kw">impl</span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ToUppercase</span> {}
<span class="kw">enum</span> <span class="ident">CaseMappingIter</span> {
<span class="ident">Three</span>(<span class="ident">char</span>, <span class="ident">char</span>, <span class="ident">char</span>),
<span class="ident">Two</span>(<span class="ident">char</span>, <span class="ident">char</span>),
<span class="ident">One</span>(<span class="ident">char</span>),
<span class="ident">Zero</span>,
}
<span class="kw">impl</span> <span class="ident">CaseMappingIter</span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">chars</span>: [<span class="ident">char</span>; <span class="number">3</span>]) <span class="op">-></span> <span class="ident">CaseMappingIter</span> {
<span class="kw">if</span> <span class="ident">chars</span>[<span class="number">2</span>] <span class="op">==</span> <span class="string">'\0'</span> {
<span class="kw">if</span> <span class="ident">chars</span>[<span class="number">1</span>] <span class="op">==</span> <span class="string">'\0'</span> {
<span class="ident">CaseMappingIter</span>::<span class="ident">One</span>(<span class="ident">chars</span>[<span class="number">0</span>]) <span class="comment">// Including if chars[0] == '\0'</span>
} <span class="kw">else</span> {
<span class="ident">CaseMappingIter</span>::<span class="ident">Two</span>(<span class="ident">chars</span>[<span class="number">0</span>], <span class="ident">chars</span>[<span class="number">1</span>])
}
} <span class="kw">else</span> {
<span class="ident">CaseMappingIter</span>::<span class="ident">Three</span>(<span class="ident">chars</span>[<span class="number">0</span>], <span class="ident">chars</span>[<span class="number">1</span>], <span class="ident">chars</span>[<span class="number">2</span>])
}
}
}
<span class="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">CaseMappingIter</span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">CaseMappingIter</span>::<span class="ident">Three</span>(<span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>) <span class="op">=></span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">CaseMappingIter</span>::<span class="ident">Two</span>(<span class="ident">b</span>, <span class="ident">c</span>);
<span class="prelude-val">Some</span>(<span class="ident">a</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">Two</span>(<span class="ident">b</span>, <span class="ident">c</span>) <span class="op">=></span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">CaseMappingIter</span>::<span class="ident">One</span>(<span class="ident">c</span>);
<span class="prelude-val">Some</span>(<span class="ident">b</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">One</span>(<span class="ident">c</span>) <span class="op">=></span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">CaseMappingIter</span>::<span class="ident">Zero</span>;
<span class="prelude-val">Some</span>(<span class="ident">c</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">Zero</span> <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">CaseMappingIter</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">CaseMappingIter</span>::<span class="ident">Three</span>(<span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>) <span class="op">=></span> {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">a</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">b</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">Two</span>(<span class="ident">b</span>, <span class="ident">c</span>) <span class="op">=></span> {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">b</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">One</span>(<span class="ident">c</span>) <span class="op">=></span> {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="ident">CaseMappingIter</span>::<span class="ident">Zero</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(()),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_struct_display"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ToLowercase</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>, <span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_struct_display"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ToUppercase</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>, <span class="ident">f</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="ident">C</span>::<span class="ident">is_digit</span>(<span class="self">self</span>, <span class="ident">radix</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="ident">C</span>::<span class="ident">to_digit</span>(<span class="self">self</span>, <span class="ident">radix</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="ident">C</span>::<span class="ident">escape_unicode</span>(<span class="self">self</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">/// # #![feature(char_escape_debug)]</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">/// # #![feature(char_escape_debug)]</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">/// # #![feature(char_escape_debug)]</span>
<span class="doccomment">/// assert_eq!('\n'.escape_debug().to_string(), "\\n");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_escape_debug"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35068"</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="ident">C</span>::<span class="ident">escape_debug</span>(<span class="self">self</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="ident">C</span>::<span class="ident">escape_default</span>(<span class="self">self</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="ident">C</span>::<span class="ident">len_utf8</span>(<span class="self">self</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="ident">C</span>::<span class="ident">len_utf16</span>(<span class="self">self</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="ident">C</span>::<span class="ident">encode_utf8</span>(<span class="self">self</span>, <span class="ident">dst</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="ident">C</span>::<span class="ident">encode_utf16</span>(<span class="self">self</span>, <span class="ident">dst</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="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">"unicode"</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">"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_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">"unicode"</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">"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_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="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="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="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 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="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">/// An iterator that decodes UTF-16 encoded code points from an iterator of `u16`s.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DecodeUtf16</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">u16</span><span class="op">></span>
{
<span class="ident">iter</span>: <span class="ident">I</span>,
<span class="ident">buf</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>,
}
<span class="doccomment">/// An iterator that decodes UTF-16 encoded code points from an iterator of `u16`s.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DecodeUtf16Error</span> {
<span class="ident">code</span>: <span class="ident">u16</span>,
}
<span class="doccomment">/// Create an iterator over the UTF-16 encoded code points in `iter`,</span>
<span class="doccomment">/// returning unpaired surrogates as `Err`s.</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">/// use std::char::decode_utf16;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// // 𝄞mus<invalid>ic<invalid></span>
<span class="doccomment">/// let v = [0xD834, 0xDD1E, 0x006d, 0x0075,</span>
<span class="doccomment">/// 0x0073, 0xDD1E, 0x0069, 0x0063,</span>
<span class="doccomment">/// 0xD834];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(decode_utf16(v.iter().cloned())</span>
<span class="doccomment">/// .map(|r| r.map_err(|e| e.unpaired_surrogate()))</span>
<span class="doccomment">/// .collect::<Vec<_>>(),</span>
<span class="doccomment">/// vec![Ok('𝄞'),</span>
<span class="doccomment">/// Ok('m'), Ok('u'), Ok('s'),</span>
<span class="doccomment">/// Err(0xDD1E),</span>
<span class="doccomment">/// Ok('i'), Ok('c'),</span>
<span class="doccomment">/// Err(0xD834)]);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A lossy decoder can be obtained by replacing `Err` results with the replacement character:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::char::{decode_utf16, REPLACEMENT_CHARACTER};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// // 𝄞mus<invalid>ic<invalid></span>
<span class="doccomment">/// let v = [0xD834, 0xDD1E, 0x006d, 0x0075,</span>
<span class="doccomment">/// 0x0073, 0xDD1E, 0x0069, 0x0063,</span>
<span class="doccomment">/// 0xD834];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(decode_utf16(v.iter().cloned())</span>
<span class="doccomment">/// .map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))</span>
<span class="doccomment">/// .collect::<String>(),</span>
<span class="doccomment">/// "𝄞mus�ic�");</span>
<span class="doccomment">/// }</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">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">decode_utf16</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">u16</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">DecodeUtf16</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">IntoIter</span><span class="op">></span> {
<span class="ident">DecodeUtf16</span> {
<span class="ident">iter</span>: <span class="ident">iter</span>.<span class="ident">into_iter</span>(),
<span class="ident">buf</span>: <span class="prelude-val">None</span>,
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">u16</span><span class="op">>></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">DecodeUtf16</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">char</span>, <span class="ident">DecodeUtf16Error</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">char</span>, <span class="ident">DecodeUtf16Error</span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">take</span>() {
<span class="prelude-val">Some</span>(<span class="ident">buf</span>) <span class="op">=></span> <span class="ident">buf</span>,
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">u</span>) <span class="op">=></span> <span class="ident">u</span>,
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
}
}
};
<span class="kw">if</span> <span class="ident">u</span> <span class="op"><</span> <span class="number">0xD800</span> <span class="op">||</span> <span class="number">0xDFFF</span> <span class="op"><</span> <span class="ident">u</span> {
<span class="comment">// not a surrogate</span>
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">from_u32_unchecked</span>(<span class="ident">u</span> <span class="kw">as</span> <span class="ident">u32</span>) }))
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">u</span> <span class="op">>=</span> <span class="number">0xDC00</span> {
<span class="comment">// a trailing surrogate</span>
<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">DecodeUtf16Error</span> { <span class="ident">code</span>: <span class="ident">u</span> }))
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">u2</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">u2</span>) <span class="op">=></span> <span class="ident">u2</span>,
<span class="comment">// eof</span>
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">DecodeUtf16Error</span> { <span class="ident">code</span>: <span class="ident">u</span> })),
};
<span class="kw">if</span> <span class="ident">u2</span> <span class="op"><</span> <span class="number">0xDC00</span> <span class="op">||</span> <span class="ident">u2</span> <span class="op">></span> <span class="number">0xDFFF</span> {
<span class="comment">// not a trailing surrogate so we're not a valid</span>
<span class="comment">// surrogate pair, so rewind to redecode u2 next time.</span>
<span class="self">self</span>.<span class="ident">buf</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">u2</span>);
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">DecodeUtf16Error</span> { <span class="ident">code</span>: <span class="ident">u</span> }));
}
<span class="comment">// all ok, so lets decode it.</span>
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> (((<span class="ident">u</span> <span class="op">-</span> <span class="number">0xD800</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><<</span> <span class="number">10</span> <span class="op">|</span> (<span class="ident">u2</span> <span class="op">-</span> <span class="number">0xDC00</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">+</span> <span class="number">0x1_0000</span>;
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">from_u32_unchecked</span>(<span class="ident">c</span>) }))
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> (<span class="ident">low</span>, <span class="ident">high</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>();
<span class="comment">// we could be entirely valid surrogates (2 elements per</span>
<span class="comment">// char), or entirely non-surrogates (1 element per char)</span>
(<span class="ident">low</span> <span class="op">/</span> <span class="number">2</span>, <span class="ident">high</span>)
}
}
<span class="kw">impl</span> <span class="ident">DecodeUtf16Error</span> {
<span class="doccomment">/// Returns the unpaired surrogate which caused this error.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unpaired_surrogate</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u16</span> {
<span class="self">self</span>.<span class="ident">code</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">DecodeUtf16Error</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"unpaired surrogate found: {:x}"</span>, <span class="self">self</span>.<span class="ident">code</span>)
}
}
<span class="doccomment">/// `U+FFFD REPLACEMENT CHARACTER` (�) is used in Unicode to represent a</span>
<span class="doccomment">/// decoding error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can occur, for example, when giving ill-formed UTF-8 bytes to</span>
<span class="doccomment">/// [`String::from_utf8_lossy`](../../std/string/struct.String.html#method.from_utf8_lossy).</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"decode_utf16"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">REPLACEMENT_CHARACTER</span>: <span class="ident">char</span> <span class="op">=</span> <span class="string">'\u{FFFD}'</span>;
</pre>
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