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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">//! Character manipulation.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For more details, see ::std_unicode::char (a.k.a. std::char)</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</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">"core_char"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">use</span> <span class="ident">char_private</span>::<span class="ident">is_printable</span>;
<span class="kw">use</span> <span class="ident">convert</span>::<span class="ident">TryFrom</span>;
<span class="kw">use</span> <span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Write</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="ident">iter</span>::<span class="ident">FusedIterator</span>;
<span class="kw">use</span> <span class="ident">mem</span>::<span class="ident">transmute</span>;
<span class="comment">// UTF-8 ranges and tags for encoding characters</span>
<span class="kw">const</span> <span class="ident">TAG_CONT</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1000_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_TWO_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1100_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_THREE_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1110_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_FOUR_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1111_0000</span>;
<span class="kw">const</span> <span class="ident">MAX_ONE_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x80</span>;
<span class="kw">const</span> <span class="ident">MAX_TWO_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x800</span>;
<span class="kw">const</span> <span class="ident">MAX_THREE_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x10000</span>;
<span class="comment">/*
Lu Uppercase_Letter an uppercase letter
Ll Lowercase_Letter a lowercase letter
Lt Titlecase_Letter a digraphic character, with first part uppercase
Lm Modifier_Letter a modifier letter
Lo Other_Letter other letters, including syllables and ideographs
Mn Nonspacing_Mark a nonspacing combining mark (zero advance width)
Mc Spacing_Mark a spacing combining mark (positive advance width)
Me Enclosing_Mark an enclosing combining mark
Nd Decimal_Number a decimal digit
Nl Letter_Number a letterlike numeric character
No Other_Number a numeric character of other type
Pc Connector_Punctuation a connecting punctuation mark, like a tie
Pd Dash_Punctuation a dash or hyphen punctuation mark
Ps Open_Punctuation an opening punctuation mark (of a pair)
Pe Close_Punctuation a closing punctuation mark (of a pair)
Pi Initial_Punctuation an initial quotation mark
Pf Final_Punctuation a final quotation mark
Po Other_Punctuation a punctuation mark of other type
Sm Math_Symbol a symbol of primarily mathematical use
Sc Currency_Symbol a currency sign
Sk Modifier_Symbol a non-letterlike modifier symbol
So Other_Symbol a symbol of other type
Zs Space_Separator a space character (of various non-zero widths)
Zl Line_Separator U+2028 LINE SEPARATOR only
Zp Paragraph_Separator U+2029 PARAGRAPH SEPARATOR only
Cc Control a C0 or C1 control code
Cf Format a format control character
Cs Surrogate a surrogate code point
Co Private_Use a private-use character
Cn Unassigned a reserved unassigned code point or a noncharacter
*/</span>
<span class="doccomment">/// The highest valid code point a `char` can have.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A [`char`] is a [Unicode Scalar Value], which means that it is a [Code</span>
<span class="doccomment">/// Point], but only ones within a certain range. `MAX` is the highest valid</span>
<span class="doccomment">/// code point that's a valid [Unicode Scalar Value].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="doccomment">/// [Unicode Scalar Value]: http://www.unicode.org/glossary/#unicode_scalar_value</span>
<span class="doccomment">/// [Code Point]: http://www.unicode.org/glossary/#code_point</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">const</span> <span class="ident">MAX</span>: <span class="ident">char</span> <span class="op">=</span> <span class="string">'\u{10ffff}'</span>;
<span class="doccomment">/// Converts a `u32` to a `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that all [`char`]s are valid [`u32`]s, and can be casted to one with</span>
<span class="doccomment">/// [`as`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let c = '💯';</span>
<span class="doccomment">/// let i = c as u32;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(128175, i);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However, the reverse is not true: not all valid [`u32`]s are valid</span>
<span class="doccomment">/// [`char`]s. `from_u32()` will return `None` if the input is not a valid value</span>
<span class="doccomment">/// for a [`char`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="doccomment">/// [`u32`]: ../../std/primitive.u32.html</span>
<span class="doccomment">/// [`as`]: ../../book/first-edition/casting-between-types.html#as</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For an unsafe version of this function which ignores these checks, see</span>
<span class="doccomment">/// [`from_u32_unchecked`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`from_u32_unchecked`]: fn.from_u32_unchecked.html</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;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = char::from_u32(0x2764);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Some('❤'), c);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returning `None` when the input is not a valid [`char`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::char;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = char::from_u32(0x110000);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(None, c);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</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">fn</span> <span class="ident">from_u32</span>(<span class="ident">i</span>: <span class="ident">u32</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="ident">char</span>::<span class="ident">try_from</span>(<span class="ident">i</span>).<span class="ident">ok</span>()
}
<span class="doccomment">/// Converts a `u32` to a `char`, ignoring validity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that all [`char`]s are valid [`u32`]s, and can be casted to one with</span>
<span class="doccomment">/// [`as`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let c = '💯';</span>
<span class="doccomment">/// let i = c as u32;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(128175, i);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However, the reverse is not true: not all valid [`u32`]s are valid</span>
<span class="doccomment">/// [`char`]s. `from_u32_unchecked()` will ignore this, and blindly cast to</span>
<span class="doccomment">/// [`char`], possibly creating an invalid one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="doccomment">/// [`u32`]: ../../std/primitive.u32.html</span>
<span class="doccomment">/// [`as`]: ../../book/first-edition/casting-between-types.html#as</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is unsafe, as it may construct invalid `char` values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For a safe version of this function, see the [`from_u32`] function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`from_u32`]: fn.from_u32.html</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;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = unsafe { char::from_u32_unchecked(0x2764) };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!('❤', c);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_from_unchecked"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_u32_unchecked</span>(<span class="ident">i</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">char</span> {
<span class="ident">transmute</span>(<span class="ident">i</span>)
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_convert"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">u32</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>
}
}
<span class="doccomment">/// Maps a byte in 0x00...0xFF to a `char` whose code point has the same value, in U+0000 to U+00FF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unicode is designed such that this effectively decodes bytes</span>
<span class="doccomment">/// with the character encoding that IANA calls ISO-8859-1.</span>
<span class="doccomment">/// This encoding is compatible with ASCII.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this is different from ISO/IEC 8859-1 a.k.a. ISO 8859-1 (with one less hyphen),</span>
<span class="doccomment">/// which leaves some "blanks", byte values that are not assigned to any character.</span>
<span class="doccomment">/// ISO-8859-1 (the IANA one) assigns them to the C0 and C1 control codes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this is *also* different from Windows-1252 a.k.a. code page 1252,</span>
<span class="doccomment">/// which is a superset ISO/IEC 8859-1 that assigns some (not all!) blanks</span>
<span class="doccomment">/// to punctuation and various Latin characters.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To confuse things further, [on the Web](https://encoding.spec.whatwg.org/)</span>
<span class="doccomment">/// `ascii`, `iso-8859-1`, and `windows-1252` are all aliases</span>
<span class="doccomment">/// for a superset of Windows-1252 that fills the remaining blanks with corresponding</span>
<span class="doccomment">/// C0 and C1 control codes.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"char_convert"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">i</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">i</span> <span class="kw">as</span> <span class="ident">char</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">impl</span> <span class="ident">TryFrom</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">CharTryFromError</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">try_from</span>(<span class="ident">i</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="kw">if</span> (<span class="ident">i</span> <span class="op">></span> <span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">||</span> (<span class="ident">i</span> <span class="op">>=</span> <span class="number">0xD800</span> <span class="op">&&</span> <span class="ident">i</span> <span class="op"><=</span> <span class="number">0xDFFF</span>) {
<span class="prelude-val">Err</span>(<span class="ident">CharTryFromError</span>(()))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">from_u32_unchecked</span>(<span class="ident">i</span>) })
}
}
}
<span class="doccomment">/// The error type returned when a conversion from u32 to char fails.</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</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">"try_from"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33417"</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">CharTryFromError</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="string">"converted integer out of range for `char`"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="doccomment">/// Converts a digit in the given radix to a `char`.</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">/// `from_digit()` will return `None` if the input is not a digit in</span>
<span class="doccomment">/// 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">/// use std::char;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = char::from_digit(4, 10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Some('4'), c);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Decimal 11 is a single digit in base 16</span>
<span class="doccomment">/// let c = char::from_digit(11, 16);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Some('b'), c);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returning `None` when the input is not a digit:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::char;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = char::from_digit(20, 10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(None, c);</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">/// use std::char;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(|| {</span>
<span class="doccomment">/// // this panics</span>
<span class="doccomment">/// let c = char::from_digit(1, 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">inline</span>]</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">fn</span> <span class="ident">from_digit</span>(<span class="ident">num</span>: <span class="ident">u32</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">char</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">"from_digit: radix is too high (maximum 36)"</span>);
}
<span class="kw">if</span> <span class="ident">num</span> <span class="op"><</span> <span class="ident">radix</span> {
<span class="kw">let</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">num</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="kw">if</span> <span class="ident">num</span> <span class="op"><</span> <span class="number">10</span> {
<span class="prelude-val">Some</span>((<span class="string">b'0'</span> <span class="op">+</span> <span class="ident">num</span>) <span class="kw">as</span> <span class="ident">char</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Some</span>((<span class="string">b'a'</span> <span class="op">+</span> <span class="ident">num</span> <span class="op">-</span> <span class="number">10</span>) <span class="kw">as</span> <span class="ident">char</span>)
}
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="comment">// NB: the stabilization and documentation for this trait is in</span>
<span class="comment">// unicode/char.rs, not here</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span> <span class="comment">// docs in libunicode/u_char.rs</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">"core_char_ext"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"the stable interface is `impl char` in later crate"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"32110"</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CharExt</span> {
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="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="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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</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="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="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="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="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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">CharExt</span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="attribute">#[<span class="ident">inline</span>]</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="attribute">#[<span class="ident">inline</span>]</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="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="attribute">#[<span class="ident">inline</span>]</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="attribute">#[<span class="ident">inline</span>]</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="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="attribute">#[<span class="ident">inline</span>]</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="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="ident">c</span> <span class="kw">if</span> <span class="ident">is_printable</span>(<span class="ident">c</span>) <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>),
<span class="ident">c</span> <span class="op">=></span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="ident">c</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="attribute">#[<span class="ident">inline</span>]</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="attribute">#[<span class="ident">inline</span>]</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="attribute">#[<span class="ident">inline</span>]</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="attribute">#[<span class="ident">inline</span>]</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 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 `struct` is created by the [`escape_unicode`] method on [`char`]. See</span>
<span class="doccomment">/// its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`escape_unicode`]: ../../std/primitive.char.html#method.escape_unicode</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</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">EscapeUnicode</span> {
<span class="ident">c</span>: <span class="ident">char</span>,
<span class="ident">state</span>: <span class="ident">EscapeUnicodeState</span>,
<span class="comment">// The index of the next hex digit to be printed (0 if none),</span>
<span class="comment">// i.e. the number of remaining hex digits to be printed;</span>
<span class="comment">// increasing from the least significant digit: 0x543210</span>
<span class="ident">hex_digit_idx</span>: <span class="ident">usize</span>,
}
<span class="comment">// The enum values are ordered so that their representation is the</span>
<span class="comment">// same as the remaining length (besides the hexadecimal digits). This</span>
<span class="comment">// likely makes `len()` a single load from memory) and inline-worth.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">EscapeUnicodeState</span> {
<span class="ident">Done</span>,
<span class="ident">RightBrace</span>,
<span class="ident">Value</span>,
<span class="ident">LeftBrace</span>,
<span class="ident">Type</span>,
<span class="ident">Backslash</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">EscapeUnicode</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="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Backslash</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeUnicodeState</span>::<span class="ident">Type</span>;
<span class="prelude-val">Some</span>(<span class="string">'\\'</span>)
}
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Type</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeUnicodeState</span>::<span class="ident">LeftBrace</span>;
<span class="prelude-val">Some</span>(<span class="string">'u'</span>)
}
<span class="ident">EscapeUnicodeState</span>::<span class="ident">LeftBrace</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeUnicodeState</span>::<span class="ident">Value</span>;
<span class="prelude-val">Some</span>(<span class="string">'{'</span>)
}
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Value</span> <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">hex_digit</span> <span class="op">=</span> ((<span class="self">self</span>.<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">>></span> (<span class="self">self</span>.<span class="ident">hex_digit_idx</span> <span class="op">*</span> <span class="number">4</span>)) <span class="op">&</span> <span class="number">0xf</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">from_digit</span>(<span class="ident">hex_digit</span>, <span class="number">16</span>).<span class="ident">unwrap</span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">hex_digit_idx</span> <span class="op">==</span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeUnicodeState</span>::<span class="ident">RightBrace</span>;
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">hex_digit_idx</span> <span class="op">-=</span> <span class="number">1</span>;
}
<span class="prelude-val">Some</span>(<span class="ident">c</span>)
}
<span class="ident">EscapeUnicodeState</span>::<span class="ident">RightBrace</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeUnicodeState</span>::<span class="ident">Done</span>;
<span class="prelude-val">Some</span>(<span class="string">'}'</span>)
}
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="prelude-val">None</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">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
(<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">len</span>()
}
<span class="kw">fn</span> <span class="ident">last</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="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">RightBrace</span> <span class="op">|</span>
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Value</span> <span class="op">|</span>
<span class="ident">EscapeUnicodeState</span>::<span class="ident">LeftBrace</span> <span class="op">|</span>
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Type</span> <span class="op">|</span>
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Backslash</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="string">'}'</span>),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_size_escape"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">EscapeUnicode</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="comment">// The match is a single memory access with no branching</span>
<span class="self">self</span>.<span class="ident">hex_digit_idx</span> <span class="op">+</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="number">0</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">RightBrace</span> <span class="op">=></span> <span class="number">1</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Value</span> <span class="op">=></span> <span class="number">2</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">LeftBrace</span> <span class="op">=></span> <span class="number">3</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Type</span> <span class="op">=></span> <span class="number">4</span>,
<span class="ident">EscapeUnicodeState</span>::<span class="ident">Backslash</span> <span class="op">=></span> <span class="number">5</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">EscapeUnicode</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">EscapeUnicode</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">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">clone</span>() {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// An iterator that yields the literal escape code of a `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`escape_default`] method on [`char`]. See</span>
<span class="doccomment">/// its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`escape_default`]: ../../std/primitive.char.html#method.escape_default</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</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">EscapeDefault</span> {
<span class="ident">state</span>: <span class="ident">EscapeDefaultState</span>
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">EscapeDefaultState</span> {
<span class="ident">Done</span>,
<span class="ident">Char</span>(<span class="ident">char</span>),
<span class="ident">Backslash</span>(<span class="ident">char</span>),
<span class="ident">Unicode</span>(<span class="ident">EscapeUnicode</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">EscapeDefault</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="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="ident">c</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>);
<span class="prelude-val">Some</span>(<span class="string">'\\'</span>)
}
<span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span>;
<span class="prelude-val">Some</span>(<span class="ident">c</span>)
}
<span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">iter</span>) <span class="op">=></span> <span class="ident">iter</span>.<span class="ident">next</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">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
(<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">len</span>()
}
<span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</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="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>);
<span class="prelude-val">Some</span>(<span class="string">'\\'</span>)
},
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">1</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span>;
<span class="prelude-val">Some</span>(<span class="ident">c</span>)
},
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(_) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span>;
<span class="prelude-val">None</span>
},
<span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span>;
<span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">Some</span>(<span class="ident">c</span>)
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
},
<span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">i</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">i</span>.<span class="ident">nth</span>(<span class="ident">n</span>),
}
}
<span class="kw">fn</span> <span class="ident">last</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="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="ident">iter</span>) <span class="op">=></span> <span class="ident">iter</span>.<span class="ident">last</span>(),
<span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(<span class="ident">c</span>) <span class="op">|</span> <span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(<span class="ident">c</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">c</span>),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_size_escape"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">EscapeDefault</span> {
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">state</span> {
<span class="ident">EscapeDefaultState</span>::<span class="ident">Done</span> <span class="op">=></span> <span class="number">0</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Char</span>(_) <span class="op">=></span> <span class="number">1</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Backslash</span>(_) <span class="op">=></span> <span class="number">2</span>,
<span class="ident">EscapeDefaultState</span>::<span class="ident">Unicode</span>(<span class="kw-2">ref</span> <span class="ident">iter</span>) <span class="op">=></span> <span class="ident">iter</span>.<span class="ident">len</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">EscapeDefault</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">EscapeDefault</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">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">clone</span>() {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// An iterator that yields the literal escape code of a `char`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`escape_debug`] method on [`char`]. See its</span>
<span class="doccomment">/// documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`escape_debug`]: ../../std/primitive.char.html#method.escape_debug</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</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">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">EscapeDebug</span>(<span class="ident">EscapeDefault</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="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">EscapeDebug</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="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="self">self</span>.<span class="number">0</span>.<span class="ident">size_hint</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="kw">impl</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">EscapeDebug</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">EscapeDebug</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="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">EscapeDebug</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="doccomment">/// An iterator over an iterator of bytes of the characters the bytes represent</span>
<span class="doccomment">/// as UTF-8</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DecodeUtf8</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">u8</span><span class="op">>></span>(::<span class="ident">iter</span>::<span class="ident">Peekable</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>);
<span class="doccomment">/// Decodes an `Iterator` of bytes as UTF-8.</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="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">decode_utf8</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">u8</span><span class="op">>></span>(<span class="ident">i</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">DecodeUtf8</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">IntoIter</span><span class="op">></span> {
<span class="ident">DecodeUtf8</span>(<span class="ident">i</span>.<span class="ident">into_iter</span>().<span class="ident">peekable</span>())
}
<span class="doccomment">/// `<DecodeUtf8 as Iterator>::next` returns this for an invalid input sequence.</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="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InvalidSequence</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">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">u8</span><span class="op">>></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">DecodeUtf8</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">InvalidSequence</span><span class="op">></span>;
<span class="attribute">#[<span class="ident">inline</span>]</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">InvalidSequence</span><span class="op">>></span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">first_byte</span><span class="op">|</span> {
<span class="comment">// Emit InvalidSequence according to</span>
<span class="comment">// Unicode §5.22 Best Practice for U+FFFD Substitution</span>
<span class="comment">// http://www.unicode.org/versions/Unicode9.0.0/ch05.pdf#G40630</span>
<span class="comment">// Roughly: consume at least one byte,</span>
<span class="comment">// then validate one byte at a time and stop before the first unexpected byte</span>
<span class="comment">// (which might be the valid start of the next byte sequence).</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">code_point</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">first_byte</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">mask</span>: <span class="ident">expr</span>) <span class="op">=></span> {
<span class="ident">code_point</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from</span>(<span class="ident">first_byte</span> <span class="op">&</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mask</span>)
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">continuation_byte</span> {
() <span class="op">=></span> { <span class="macro">continuation_byte</span><span class="macro">!</span>(<span class="number">0x80</span>...<span class="number">0xBF</span>) };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">range</span>: <span class="ident">pat</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">peek</span>() {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">byte</span> @ <span class="macro-nonterminal">$</span><span class="macro-nonterminal">range</span>) <span class="op">=></span> {
<span class="ident">code_point</span> <span class="op">=</span> (<span class="ident">code_point</span> <span class="op"><<</span> <span class="number">6</span>) <span class="op">|</span> <span class="ident">u32</span>::<span class="ident">from</span>(<span class="ident">byte</span> <span class="op">&</span> <span class="number">0b0011_1111</span>);
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">next</span>();
}
_ <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">InvalidSequence</span>(()))
}
}
}
<span class="kw">match</span> <span class="ident">first_byte</span> {
<span class="number">0x00</span>...<span class="number">0x7F</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b1111_1111</span>);
}
<span class="number">0xC2</span>...<span class="number">0xDF</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0001_1111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xE0</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_1111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>(<span class="number">0xA0</span>...<span class="number">0xBF</span>); <span class="comment">// 0x80...0x9F here are overlong</span>
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xE1</span>...<span class="number">0xEC</span> <span class="op">|</span> <span class="number">0xEE</span>...<span class="number">0xEF</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_1111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>();
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xED</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_1111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>(<span class="number">0x80</span>...<span class="number">0x9F</span>); <span class="comment">// 0xA0..0xBF here are surrogates</span>
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xF0</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_0111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>(<span class="number">0x90</span>...<span class="number">0xBF</span>); <span class="comment">// 0x80..0x8F here are overlong</span>
<span class="macro">continuation_byte</span><span class="macro">!</span>();
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xF1</span>...<span class="number">0xF3</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_0111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>();
<span class="macro">continuation_byte</span><span class="macro">!</span>();
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
<span class="number">0xF4</span> <span class="op">=></span> {
<span class="macro">first_byte</span><span class="macro">!</span>(<span class="number">0b0000_0111</span>);
<span class="macro">continuation_byte</span><span class="macro">!</span>(<span class="number">0x80</span>...<span class="number">0x8F</span>); <span class="comment">// 0x90..0xBF here are beyond char::MAX</span>
<span class="macro">continuation_byte</span><span class="macro">!</span>();
<span class="macro">continuation_byte</span><span class="macro">!</span>();
}
_ <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">InvalidSequence</span>(())) <span class="comment">// Illegal first byte, overlong, or beyond MAX</span>
}
<span class="kw">unsafe</span> {
<span class="prelude-val">Ok</span>(<span class="ident">from_u32_unchecked</span>(<span class="ident">code_point</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="op"><</span><span class="ident">I</span>: <span class="ident">FusedIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">u8</span><span class="op">>></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">DecodeUtf8</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> {}
</pre>
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