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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| </pre><pre class="rust "> |
| <span class="comment">/* Copyright 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">use</span> <span class="ident">Utf8Char</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">fmt</span>,<span class="ident">mem</span>,<span class="ident">u32</span>,<span class="ident">u64</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Not</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Read</span>, <span class="ident">Error</span> <span class="kw">as</span> <span class="ident">ioError</span>}; |
| |
| |
| |
| <span class="doccomment">/// Read or iterate over the bytes in the UTF-8 representation of a codepoint.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utf8Iterator</span> (<span class="ident">u32</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">Utf8Iterator</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="self">Self</span> { |
| <span class="kw">let</span> <span class="ident">used</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_le</span>(<span class="kw">unsafe</span>{ <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">uc</span>) }); |
| <span class="comment">// uses u64 because shifting an u32 by 32 bits is a no-op.</span> |
| <span class="kw">let</span> <span class="ident">unused_set</span> <span class="op">=</span> (<span class="ident">u64</span>::<span class="ident">MAX</span> <span class="op"><<</span> <span class="ident">uc</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u64</span><span class="kw-2">*</span><span class="number">8</span>) <span class="kw">as</span> <span class="ident">u32</span>; |
| <span class="ident">Utf8Iterator</span>(<span class="ident">used</span> <span class="op">|</span> <span class="ident">unused_set</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">Utf8Iterator</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="self">Self</span>::<span class="ident">from</span>(<span class="ident">Utf8Char</span>::<span class="ident">from</span>(<span class="ident">c</span>)) |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Utf8Iterator</span> { |
| <span class="kw">type</span> <span class="ident">Item</span><span class="op">=</span><span class="ident">u8</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">u8</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span> <span class="kw">as</span> <span class="ident">u8</span>; |
| <span class="kw">if</span> <span class="ident">next</span> <span class="op">==</span> <span class="number">0xff</span> { |
| <span class="prelude-val">None</span> |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="number">0</span> <span class="op">=</span> (<span class="self">self</span>.<span class="number">0</span> <span class="op">>></span> <span class="number">8</span>) <span class="op">|</span> <span class="number">0xff_00_00_00</span>; |
| <span class="prelude-val">Some</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="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>())) |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Utf8Iterator</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">// not straightforward, but possible</span> |
| <span class="kw">let</span> <span class="ident">unused_bytes</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">not</span>().<span class="ident">leading_zeros</span>() <span class="op">/</span> <span class="number">8</span>; |
| <span class="number">4</span> <span class="op">-</span> <span class="ident">unused_bytes</span> <span class="kw">as</span> <span class="ident">usize</span> |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Utf8Iterator</span> { |
| <span class="doccomment">/// Always returns Ok</span> |
| <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</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">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">ioError</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">wrote</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ptr</span>) <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">get_mut</span>(<span class="ident">wrote</span>) {<span class="comment">// while loop because I need the counter afterwards</span> |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">next</span>() {<span class="comment">// don't call self.next() untill I know I can write the result.</span> |
| <span class="kw-2">*</span><span class="ident">ptr</span> <span class="op">=</span> <span class="ident">b</span>; |
| <span class="ident">wrote</span> <span class="op">+=</span> <span class="number">1</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">wrote</span>) |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Utf8Iterator</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="kw">let</span> <span class="ident">content</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">collect</span>(); |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"bytes left: {:?}, content: {:x}"</span>, <span class="ident">content</span>, <span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| </pre> |
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