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| </pre><pre class="rust "> |
| <span class="doccomment">//! An iterator over the `char`s of a reader.</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! A copy of the unstable code from the stdlib's std::io::Read::chars.</span> |
| <span class="doccomment">//! TODO: Remove this once [Read::chars](https://github.com/rust-lang/rust/issues/27802) has been stabilized</span> |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>; |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">chars</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span>(<span class="ident">read</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Chars</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">Sized</span> |
| { |
| <span class="ident">Chars</span> { <span class="ident">inner</span>: <span class="ident">read</span> } |
| } |
| |
| <span class="comment">// https://tools.ietf.org/html/rfc3629</span> |
| <span class="kw">static</span> <span class="ident">UTF8_CHAR_WIDTH</span>: [<span class="ident">u8</span>; <span class="number">256</span>] <span class="op">=</span> [ |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="comment">// 0x1F</span> |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="comment">// 0x3F</span> |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="comment">// 0x5F</span> |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, |
| <span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="comment">// 0x7F</span> |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="comment">// 0x9F</span> |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="comment">// 0xBF</span> |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>, |
| <span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>, <span class="comment">// 0xDF</span> |
| <span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>,<span class="number">3</span>, <span class="comment">// 0xEF</span> |
| <span class="number">4</span>,<span class="number">4</span>,<span class="number">4</span>,<span class="number">4</span>,<span class="number">4</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="comment">// 0xFF</span> |
| ]; |
| |
| <span class="doccomment">/// Given a first byte, determine how many bytes are in this UTF-8 character</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">utf8_char_width</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">return</span> <span class="ident">UTF8_CHAR_WIDTH</span>[<span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="kw">as</span> <span class="ident">usize</span>; |
| } |
| |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Chars</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> { |
| <span class="ident">inner</span>: <span class="ident">R</span>, |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">CharsError</span> { |
| <span class="ident">NotUtf8</span>, |
| <span class="ident">Other</span>(<span class="ident">io</span>::<span class="ident">Error</span>), |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Chars</span><span class="op"><</span><span class="ident">R</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">CharsError</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">char</span>, <span class="ident">CharsError</span><span class="op">>></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>]; |
| <span class="kw">let</span> <span class="ident">first_byte</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) { |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Ok</span>(..) <span class="op">=></span> <span class="ident">buf</span>[<span class="number">0</span>], |
| <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="ident">e</span>))), |
| }; |
| <span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">utf8_char_width</span>(<span class="ident">first_byte</span>); |
| <span class="kw">if</span> <span class="ident">width</span> <span class="op">==</span> <span class="number">1</span> { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">first_byte</span> <span class="kw">as</span> <span class="ident">char</span>)); |
| } |
| <span class="kw">if</span> <span class="ident">width</span> <span class="op">==</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>)); |
| } |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="ident">first_byte</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]; |
| { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">start</span> <span class="op">=</span> <span class="number">1</span>; |
| <span class="kw">while</span> <span class="ident">start</span> <span class="op"><</span> <span class="ident">width</span> { |
| <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[<span class="ident">start</span>..<span class="ident">width</span>]) { |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>)), |
| <span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">start</span> <span class="op">+=</span> <span class="ident">n</span>, |
| <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="ident">e</span>))), |
| } |
| } |
| } |
| <span class="prelude-val">Some</span>(<span class="kw">match</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">width</span>]).<span class="ident">ok</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>()), |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>), |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">CharsError</span> { |
| <span class="kw">fn</span> <span class="ident">description</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">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> <span class="string">"invalid utf8 encoding"</span>, |
| <span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">error</span>::<span class="ident">Error</span>::<span class="ident">description</span>(<span class="ident">e</span>), |
| } |
| } |
| <span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> <span class="prelude-val">None</span>, |
| <span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">e</span>.<span class="ident">cause</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">CharsError</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">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> <span class="string">"byte stream did not contain valid utf8"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>), |
| <span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">e</span>.<span class="ident">fmt</span>(<span class="ident">f</span>), |
| } |
| } |
| } |
| </pre> |
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