| <!DOCTYPE html> |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| <meta name="generator" content="rustdoc"> |
| <meta name="description" content="Source to the Rust file `/home/fmp/.cargo/registry/src/github.com-1ecc6299db9ec823/utf8-ranges-0.1.3/src/char_utf8.rs`."> |
| <meta name="keywords" content="rust, rustlang, rust-lang"> |
| |
| <title>char_utf8.rs.html -- source</title> |
| |
| <link rel="stylesheet" type="text/css" href="../../normalize.css"> |
| <link rel="stylesheet" type="text/css" href="../../rustdoc.css"> |
| <link rel="stylesheet" type="text/css" href="../../main.css"> |
| |
| |
| |
| |
| </head> |
| <body class="rustdoc source"> |
| <!--[if lte IE 8]> |
| <div class="warning"> |
| This old browser is unsupported and will most likely display funky |
| things. |
| </div> |
| <![endif]--> |
| |
| |
| |
| <nav class="sidebar"> |
| |
| |
| </nav> |
| |
| <nav class="sub"> |
| <form class="search-form js-only"> |
| <div class="search-container"> |
| <input class="search-input" name="search" |
| autocomplete="off" |
| placeholder="Click or press ‘S’ to search, ‘?’ for more options…" |
| type="search"> |
| </div> |
| </form> |
| </nav> |
| |
| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
| <span id="2"> 2</span> |
| <span id="3"> 3</span> |
| <span id="4"> 4</span> |
| <span id="5"> 5</span> |
| <span id="6"> 6</span> |
| <span id="7"> 7</span> |
| <span id="8"> 8</span> |
| <span id="9"> 9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| </pre><pre class="rust "> |
| <span class="comment">// Pulled from std::char until encode_utf8 stabilizes. ---AG</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="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode_utf8</span>(<span class="ident">character</span>: <span class="ident">char</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">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="ident">character</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="op">&&</span> <span class="op">!</span><span class="ident">dst</span>.<span class="ident">is_empty</span>() { |
| <span class="ident">dst</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="prelude-val">Some</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="ident">dst</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="ident">dst</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="prelude-val">Some</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="ident">dst</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="ident">dst</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="ident">dst</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="prelude-val">Some</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="ident">dst</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="ident">dst</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="ident">dst</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="ident">dst</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="prelude-val">Some</span>(<span class="number">4</span>) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| </pre> |
| </section> |
| <section id='search' class="content hidden"></section> |
| |
| <section class="footer"></section> |
| |
| <aside id="help" class="hidden"> |
| <div> |
| <h1 class="hidden">Help</h1> |
| |
| <div class="shortcuts"> |
| <h2>Keyboard Shortcuts</h2> |
| |
| <dl> |
| <dt>?</dt> |
| <dd>Show this help dialog</dd> |
| <dt>S</dt> |
| <dd>Focus the search field</dd> |
| <dt>⇤</dt> |
| <dd>Move up in search results</dd> |
| <dt>⇥</dt> |
| <dd>Move down in search results</dd> |
| <dt>⏎</dt> |
| <dd>Go to active search result</dd> |
| <dt>+</dt> |
| <dd>Collapse/expand all sections</dd> |
| </dl> |
| </div> |
| |
| <div class="infos"> |
| <h2>Search Tricks</h2> |
| |
| <p> |
| Prefix searches with a type followed by a colon (e.g. |
| <code>fn:</code>) to restrict the search to a given type. |
| </p> |
| |
| <p> |
| Accepted types are: <code>fn</code>, <code>mod</code>, |
| <code>struct</code>, <code>enum</code>, |
| <code>trait</code>, <code>type</code>, <code>macro</code>, |
| and <code>const</code>. |
| </p> |
| |
| <p> |
| Search functions by type signature (e.g. |
| <code>vec -> usize</code> or <code>* -> vec</code>) |
| </p> |
| </div> |
| </div> |
| </aside> |
| |
| |
| |
| <script> |
| window.rootPath = "../../"; |
| window.currentCrate = "utf8_ranges"; |
| </script> |
| <script src="../../main.js"></script> |
| <script defer src="../../search-index.js"></script> |
| </body> |
| </html> |
