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| </pre><pre class="rust "> |
| <span class="comment">/* Copyright 2016 Torbjørn Birch Moltu |
| * |
| * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or |
| * http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or |
| * http://opensource.org/licenses/MIT>, at your option. This file may not be |
| * copied, modified, or distributed except according to those terms. |
| */</span> |
| |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">errors</span>::<span class="ident">FromStrError</span>; |
| <span class="kw">use</span> <span class="ident">error</span>::{<span class="ident">InvalidUtf8Slice</span>,<span class="ident">InvalidUtf8Array</span>}; |
| <span class="kw">use</span> <span class="ident">Utf8Iterator</span>; |
| <span class="kw">use</span> <span class="ident">CharExt</span>; |
| <span class="kw">use</span> <span class="ident">U8UtfExt</span>; |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">hash</span>,<span class="ident">fmt</span>, <span class="ident">str</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Borrow</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Deref</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">transmute</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>::<span class="ident">AsciiExt</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">ascii</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ascii</span>::{<span class="ident">Ascii</span>,<span class="ident">AsciiCast</span>}; |
| |
| |
| <span class="comment">// I don't think there is any good default value for char, but char does.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Default</span>)]</span> |
| <span class="comment">// char doesn't do anything more advanced than u32 for Eq/Ord, so we shouldn't either.</span> |
| <span class="comment">// The default impl of Ord for arrays works out because longer codepoints</span> |
| <span class="comment">// start with more ones, so if they're equal, the length is the same,</span> |
| <span class="comment">// breaks down for values above 0x1f_ff_ff but those can only be created by unsafe code.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>,<span class="ident">Eq</span>, <span class="ident">PartialOrd</span>,<span class="ident">Ord</span>)]</span> |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>)]</span> |
| |
| |
| <span class="doccomment">/// Store a `char` as UTF-8 so it can be borrowed as a `str`</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Has the same size as `char`, and is a `[u8;4]`</span> |
| <span class="doccomment">/// with the invariant that the first nth bytes are valid UTF-8, and the remaining are zero.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utf8Char</span> { |
| <span class="ident">bytes</span>: [<span class="ident">u8</span>; <span class="number">4</span>], |
| } |
| |
| |
| <span class="comment">/////////////////////</span> |
| <span class="comment">//conversion traits//</span> |
| <span class="comment">/////////////////////</span> |
| <span class="kw">impl</span> <span class="ident">str</span>::<span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">FromStrError</span>; |
| <span class="doccomment">/// The string must contain exactly one codepoint</span> |
| <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">FromStrError</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">uc</span> <span class="op">=</span> <span class="ident">Utf8Char</span>::<span class="ident">default</span>(); |
| <span class="kw">for</span> (<span class="ident">src</span>, <span class="ident">dst</span>) <span class="kw">in</span> <span class="ident">s</span>.<span class="ident">as_bytes</span>().<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">uc</span>.<span class="ident">bytes</span>.<span class="ident">iter_mut</span>()) { |
| <span class="kw-2">*</span><span class="ident">dst</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">src</span>;<span class="comment">// happens min(s.len(), 4) times</span> |
| } |
| <span class="kw">if</span> <span class="ident">uc</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">s</span>.<span class="ident">len</span>() {<span class="prelude-val">Ok</span>(<span class="ident">uc</span>)} |
| <span class="kw">else</span> <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">is_empty</span>() {<span class="prelude-val">Err</span>(<span class="ident">FromStrError</span>::<span class="ident">Empty</span>)} |
| <span class="kw">else</span> {<span class="prelude-val">Err</span>(<span class="ident">FromStrError</span>::<span class="ident">SeveralCodePoints</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">Utf8Char</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">Utf8Char</span>{ <span class="ident">bytes</span>: <span class="ident">c</span>.<span class="ident">to_utf8_array</span>().<span class="number">0</span> } |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Utf8Char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">uc</span>: <span class="ident">Utf8Char</span>) <span class="op">-></span> <span class="ident">char</span> { |
| <span class="kw">unsafe</span>{ <span class="ident">char</span>::<span class="ident">from_utf8_exact_slice_unchecked</span>(<span class="kw-2">&</span><span class="ident">uc</span>.<span class="ident">bytes</span>[..<span class="ident">uc</span>.<span class="ident">len</span>()]) } |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">type</span> <span class="ident">Item</span><span class="op">=</span><span class="ident">u8</span>; |
| <span class="kw">type</span> <span class="ident">IntoIter</span><span class="op">=</span><span class="ident">Utf8Iterator</span>; |
| <span class="doccomment">/// Iterate over the byte values.</span> |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Utf8Iterator</span> { |
| <span class="ident">Utf8Iterator</span>::<span class="ident">from</span>(<span class="self">self</span>) |
| } |
| } |
| |
| |
| <span class="comment">/////////////////</span> |
| <span class="comment">//getter traits//</span> |
| <span class="comment">/////////////////</span> |
| <span class="kw">impl</span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bytes</span>[..<span class="self">self</span>.<span class="ident">len</span>()] |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw">unsafe</span>{ <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>( <span class="self">self</span>.<span class="ident">as_ref</span>() ) } |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Borrow</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="self">self</span>.<span class="ident">as_ref</span>() |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Borrow</span><span class="op"><</span><span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="self">self</span>.<span class="ident">as_ref</span>() |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">str</span>; |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Target</span> { |
| <span class="self">self</span>.<span class="ident">as_ref</span>() |
| } |
| } |
| |
| |
| <span class="comment">////////////////</span> |
| <span class="comment">//ascii traits//</span> |
| <span class="comment">////////////////</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="ident">Utf8Char</span>; |
| <span class="kw">fn</span> <span class="ident">is_ascii</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>].<span class="ident">is_ascii</span>() |
| } |
| <span class="kw">fn</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">eq_ignore_ascii_case</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">to_char</span>()) |
| } |
| <span class="kw">fn</span> <span class="ident">to_ascii_uppercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Owned</span> { |
| <span class="kw">let</span> <span class="ident">ascii</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>].<span class="ident">to_ascii_uppercase</span>(); |
| <span class="kw">if</span> <span class="ident">ascii</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>] {<span class="kw-2">*</span><span class="self">self</span>} |
| <span class="kw">else</span> {<span class="ident">Utf8Char</span>{ <span class="ident">bytes</span>: [<span class="ident">ascii</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>] }} |
| } |
| <span class="kw">fn</span> <span class="ident">to_ascii_lowercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Owned</span> { |
| <span class="kw">let</span> <span class="ident">ascii</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>].<span class="ident">to_ascii_lowercase</span>(); |
| <span class="kw">if</span> <span class="ident">ascii</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>] {<span class="kw-2">*</span><span class="self">self</span>}<span class="comment">// unchanged</span> |
| <span class="kw">else</span> {<span class="ident">Utf8Char</span>{ <span class="ident">bytes</span>: [<span class="ident">ascii</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>] }}<span class="comment">// is ascii</span> |
| } |
| <span class="comment">// Theese methods are what prevents this from becoming stable</span> |
| <span class="kw">fn</span> <span class="ident">make_ascii_uppercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_uppercase</span>() |
| } |
| <span class="kw">fn</span> <span class="ident">make_ascii_lowercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_lowercase</span>(); |
| } |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Ascii</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">ac</span>: <span class="ident">Ascii</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="ident">Utf8Char</span>{ <span class="ident">bytes</span>: [<span class="ident">ac</span>.<span class="ident">as_byte</span>(),<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>] } |
| } |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">AsciiCast</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">Ascii</span>; |
| <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">to_ascii_nocheck</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Ascii</span> { |
| <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>].<span class="ident">to_ascii_nocheck</span>() |
| } |
| } |
| |
| |
| <span class="comment">/////////////////////////////////////////////////////////</span> |
| <span class="comment">//Genaral traits that cannot be derived to emulate char//</span> |
| <span class="comment">/////////////////////////////////////////////////////////</span> |
| <span class="kw">impl</span> <span class="ident">hash</span>::<span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span> : <span class="ident">hash</span>::<span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">hash</span>(<span class="ident">state</span>); |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Utf8Char</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmtr</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">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">to_char</span>(), <span class="ident">fmtr</span>) |
| } |
| } |
| |
| |
| <span class="comment">///////////////////////////////////////////////////////</span> |
| <span class="comment">//pub impls that should be together for nicer rustdoc//</span> |
| <span class="comment">///////////////////////////////////////////////////////</span> |
| <span class="kw">impl</span> <span class="ident">Utf8Char</span> { |
| <span class="doccomment">/// Validate the start of a UTF-8 slice and store it.</span> |
| <span class="doccomment">/// Also returns how many bytes were needed.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If it's a str and you know it contains only one codepoint,</span> |
| <span class="doccomment">/// use `.from_str()` to skip the validation.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice_start</span>(<span class="ident">src</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="self">Self</span>,<span class="ident">usize</span>),<span class="ident">InvalidUtf8Slice</span><span class="op">></span> { |
| <span class="comment">// need to convert to char to check codepoint, but not convert back.</span> |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">char</span>::<span class="ident">from_utf8_slice</span>(<span class="ident">src</span>)).<span class="number">1</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">uc</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">default</span>(); |
| <span class="kw">for</span> (<span class="ident">dst</span>, <span class="ident">src</span>) <span class="kw">in</span> <span class="ident">uc</span>.<span class="ident">bytes</span>.<span class="ident">iter_mut</span>().<span class="ident">zip</span>(<span class="ident">src</span>).<span class="ident">take</span>(<span class="ident">len</span>) { |
| <span class="kw-2">*</span><span class="ident">dst</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">src</span>; |
| } |
| <span class="prelude-val">Ok</span>((<span class="ident">uc</span>,<span class="ident">len</span>)) |
| } |
| <span class="doccomment">/// Validate the array and store it.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_array</span>(<span class="ident">utf8</span>: [<span class="ident">u8</span>;<span class="number">4</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>,<span class="ident">InvalidUtf8Array</span><span class="op">></span> { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">char</span>::<span class="ident">from_utf8_array</span>(<span class="ident">utf8</span>)); |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">Utf8Char</span>{ <span class="ident">bytes</span>: <span class="ident">utf8</span> }.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u32</span>; |
| <span class="kw">let</span> <span class="ident">mask</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_le</span>(<span class="number">0xff_ff_ff_ff</span> <span class="op">>></span> <span class="number">8</span><span class="kw-2">*</span>(<span class="number">4</span><span class="op">-</span><span class="ident">len</span>)); |
| <span class="kw">let</span> <span class="ident">unused_zeroed</span> <span class="op">=</span> <span class="ident">mask</span> <span class="op">&</span> <span class="kw">unsafe</span>{ <span class="ident">transmute</span>::<span class="op"><</span>_,<span class="ident">u32</span><span class="op">></span>(<span class="ident">utf8</span>) }; |
| <span class="prelude-val">Ok</span>(<span class="kw">unsafe</span>{ <span class="ident">transmute</span>(<span class="ident">unused_zeroed</span>) }) |
| } |
| |
| <span class="doccomment">/// Result is 1...4 and identical to `.as_ref().len()` or `.as_char().len_utf8()`.</span> |
| <span class="doccomment">/// There is no .is_emty() because it would always return false.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">bytes</span>[<span class="number">0</span>].<span class="ident">extra_utf8_bytes_unchecked</span>() <span class="op">+</span> <span class="number">1</span> |
| } |
| |
| <span class="doccomment">/// Convert from UTF-8 to UTF-32</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_char</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> { |
| <span class="self">self</span>.<span class="ident">into</span>() |
| } |
| <span class="doccomment">/// Write the internal representation to a slice,</span> |
| <span class="doccomment">/// and then returns the number of bytes written.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `None` is returned if the buffer is too small; then the buffer is left unmodified.</span> |
| <span class="doccomment">/// A buffer of length four is always large enough.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_slice</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="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op"><=</span> <span class="ident">dst</span>.<span class="ident">len</span>() { |
| <span class="kw">for</span> (<span class="ident">dst</span>, <span class="ident">src</span>) <span class="kw">in</span> <span class="ident">dst</span>.<span class="ident">iter_mut</span>().<span class="ident">zip</span>(<span class="self">self</span>.<span class="ident">bytes</span>.<span class="ident">iter</span>()) { |
| <span class="kw-2">*</span><span class="ident">dst</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">src</span>; |
| } |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| <span class="doccomment">/// Expose the internal array and the number of used bytes.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_array</span>(<span class="self">self</span>) <span class="op">-></span> ([<span class="ident">u8</span>;<span class="number">4</span>],<span class="ident">usize</span>) { |
| (<span class="self">self</span>.<span class="ident">bytes</span>, <span class="self">self</span>.<span class="ident">len</span>()) |
| } |
| } |
| </pre> |
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