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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2017 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="kw">use</span> <span class="ident">char</span>;
<span class="kw">use</span> <span class="ident">str</span> <span class="kw">as</span> <span class="ident">core_str</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">fmt</span>::<span class="ident">Write</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="doccomment">/// Lossy UTF-8 string.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"str_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utf8Lossy</span> {
<span class="ident">bytes</span>: [<span class="ident">u8</span>]
}
<span class="kw">impl</span> <span class="ident">Utf8Lossy</span> {
<span class="kw">pub</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="kw-2">&</span><span class="ident">Utf8Lossy</span> {
<span class="ident">Utf8Lossy</span>::<span class="ident">from_bytes</span>(<span class="ident">s</span>.<span class="ident">as_bytes</span>())
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Utf8Lossy</span> {
<span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">bytes</span>) }
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">chunks</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Utf8LossyChunksIter</span> {
<span class="ident">Utf8LossyChunksIter</span> { <span class="ident">source</span>: <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bytes</span> }
}
}
<span class="doccomment">/// Iterator over lossy UTF-8 string</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"str_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utf8LossyChunksIter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">source</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>],
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"str_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</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">Utf8LossyChunk</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Sequence of valid chars.</span>
<span class="doccomment">/// Can be empty between broken UTF-8 chars.</span>
<span class="kw">pub</span> <span class="ident">valid</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
<span class="doccomment">/// Single broken char, empty if none.</span>
<span class="doccomment">/// Empty iff iterator item is last.</span>
<span class="kw">pub</span> <span class="ident">broken</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>],
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Utf8LossyChunksIter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Utf8LossyChunk</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Utf8LossyChunk</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">>></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">source</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="kw">const</span> <span class="ident">TAG_CONT_U8</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">128</span>;
<span class="kw">fn</span> <span class="ident">unsafe_get</span>(<span class="ident">xs</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">u8</span> {
<span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="ident">xs</span>.<span class="ident">get_unchecked</span>(<span class="ident">i</span>) }
}
<span class="kw">fn</span> <span class="ident">safe_get</span>(<span class="ident">xs</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">u8</span> {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">>=</span> <span class="ident">xs</span>.<span class="ident">len</span>() { <span class="number">0</span> } <span class="kw">else</span> { <span class="ident">unsafe_get</span>(<span class="ident">xs</span>, <span class="ident">i</span>) }
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">i</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">source</span>.<span class="ident">len</span>() {
<span class="kw">let</span> <span class="ident">i_</span> <span class="op">=</span> <span class="ident">i</span>;
<span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="ident">unsafe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>);
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">byte</span> <span class="op"><</span> <span class="number">128</span> {
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">core_str</span>::<span class="ident">utf8_char_width</span>(<span class="ident">byte</span>);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">error</span> { () <span class="op">=></span> ({
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Utf8LossyChunk</span> {
<span class="ident">valid</span>: <span class="ident">core_str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">source</span>[<span class="number">0</span>..<span class="ident">i_</span>]),
<span class="ident">broken</span>: <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">source</span>[<span class="ident">i_</span>..<span class="ident">i</span>],
};
<span class="self">self</span>.<span class="ident">source</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">source</span>[<span class="ident">i</span>..];
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">r</span>);
}
})}
<span class="kw">match</span> <span class="ident">w</span> {
<span class="number">2</span> <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>) <span class="op">&</span> <span class="number">192</span> <span class="op">!=</span> <span class="ident">TAG_CONT_U8</span> {
<span class="macro">error</span><span class="macro">!</span>();
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="number">3</span> <span class="op">=></span> {
<span class="kw">match</span> (<span class="ident">byte</span>, <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>)) {
(<span class="number">0xE0</span>, <span class="number">0xA0</span> ... <span class="number">0xBF</span>) <span class="op">=></span> (),
(<span class="number">0xE1</span> ... <span class="number">0xEC</span>, <span class="number">0x80</span> ... <span class="number">0xBF</span>) <span class="op">=></span> (),
(<span class="number">0xED</span>, <span class="number">0x80</span> ... <span class="number">0x9F</span>) <span class="op">=></span> (),
(<span class="number">0xEE</span> ... <span class="number">0xEF</span>, <span class="number">0x80</span> ... <span class="number">0xBF</span>) <span class="op">=></span> (),
<span class="kw">_</span> <span class="op">=></span> {
<span class="macro">error</span><span class="macro">!</span>();
}
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>) <span class="op">&</span> <span class="number">192</span> <span class="op">!=</span> <span class="ident">TAG_CONT_U8</span> {
<span class="macro">error</span><span class="macro">!</span>();
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="number">4</span> <span class="op">=></span> {
<span class="kw">match</span> (<span class="ident">byte</span>, <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>)) {
(<span class="number">0xF0</span>, <span class="number">0x90</span> ... <span class="number">0xBF</span>) <span class="op">=></span> (),
(<span class="number">0xF1</span> ... <span class="number">0xF3</span>, <span class="number">0x80</span> ... <span class="number">0xBF</span>) <span class="op">=></span> (),
(<span class="number">0xF4</span>, <span class="number">0x80</span> ... <span class="number">0x8F</span>) <span class="op">=></span> (),
<span class="kw">_</span> <span class="op">=></span> {
<span class="macro">error</span><span class="macro">!</span>();
}
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>) <span class="op">&</span> <span class="number">192</span> <span class="op">!=</span> <span class="ident">TAG_CONT_U8</span> {
<span class="macro">error</span><span class="macro">!</span>();
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">safe_get</span>(<span class="self">self</span>.<span class="ident">source</span>, <span class="ident">i</span>) <span class="op">&</span> <span class="number">192</span> <span class="op">!=</span> <span class="ident">TAG_CONT_U8</span> {
<span class="macro">error</span><span class="macro">!</span>();
}
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="kw">_</span> <span class="op">=></span> {
<span class="macro">error</span><span class="macro">!</span>();
}
}
}
}
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Utf8LossyChunk</span> {
<span class="ident">valid</span>: <span class="kw">unsafe</span> { <span class="ident">core_str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="self">self</span>.<span class="ident">source</span>) },
<span class="ident">broken</span>: <span class="kw-2">&</span>[],
};
<span class="self">self</span>.<span class="ident">source</span> <span class="op">=</span> <span class="kw-2">&</span>[];
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">r</span>);
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Utf8Lossy</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="comment">// If we're the empty string then our iterator won't actually yield</span>
<span class="comment">// anything, so perform the formatting manually</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">bytes</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="string">""</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="kw">for</span> <span class="ident">Utf8LossyChunk</span> { <span class="ident">valid</span>, <span class="ident">broken</span> } <span class="kw">in</span> <span class="self">self</span>.<span class="ident">chunks</span>() {
<span class="comment">// If we successfully decoded the whole chunk as a valid string then</span>
<span class="comment">// we can return a direct formatting of the string which will also</span>
<span class="comment">// respect various formatting flags if possible.</span>
<span class="kw">if</span> <span class="ident">valid</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">bytes</span>.<span class="ident">len</span>() {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">broken</span>.<span class="ident">is_empty</span>());
<span class="kw">return</span> <span class="ident">valid</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="ident">valid</span>)<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="op">!</span><span class="ident">broken</span>.<span class="ident">is_empty</span>() {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">char</span>::<span class="ident">REPLACEMENT_CHARACTER</span>)<span class="question-mark">?</span>;
}
}
<span class="prelude-val">Ok</span>(())
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Utf8Lossy</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">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</span>)<span class="question-mark">?</span>;
<span class="kw">for</span> <span class="ident">Utf8LossyChunk</span> { <span class="ident">valid</span>, <span class="ident">broken</span> } <span class="kw">in</span> <span class="self">self</span>.<span class="ident">chunks</span>() {
<span class="comment">// Valid part.</span>
<span class="comment">// Here we partially parse UTF-8 again which is suboptimal.</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">from</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="ident">valid</span>.<span class="ident">char_indices</span>() {
<span class="kw">let</span> <span class="ident">esc</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">escape_debug</span>();
<span class="comment">// If char needs escaping, flush backlog so far and write, else skip</span>
<span class="kw">if</span> <span class="ident">esc</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">1</span> {
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="ident">valid</span>[<span class="ident">from</span>..<span class="ident">i</span>])<span class="question-mark">?</span>;
<span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">esc</span> {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>;
}
<span class="ident">from</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">c</span>.<span class="ident">len_utf8</span>();
}
}
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="ident">valid</span>[<span class="ident">from</span>..])<span class="question-mark">?</span>;
}
<span class="comment">// Broken parts of string as hex escape.</span>
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">broken</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"\\x{:02x}"</span>, <span class="ident">b</span>)<span class="question-mark">?</span>;
}
}
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</span>)
}
}
</pre>
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