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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="doccomment">//! Boilerplatey error enums</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="self">self</span>,<span class="ident">Display</span>,<span class="ident">Formatter</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>; |
| |
| |
| |
| <span class="doccomment">/// Reason why Utf8Char::from_str() failed.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">FromStrError</span> { |
| <span class="doccomment">/// Utf8Char cannot store more than a single codepoint.</span> |
| <span class="ident">SeveralCodePoints</span>, |
| <span class="doccomment">/// Utf8Char cannot be empty.</span> |
| <span class="ident">Empty</span>, |
| } |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">FromStrError</span>::<span class="kw-2">*</span>; |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">FromStrError</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">SeveralCodePoints</span> <span class="op">=></span> <span class="string">"has more than one codepoint"</span>, |
| <span class="ident">Empty</span> <span class="op">=></span> <span class="string">"is empty"</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">FromStrError</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| |
| <span class="doccomment">/// Reasons why an u32 is not a valid utf codepoint.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidCodePoint</span> { |
| <span class="doccomment">/// It's reserved for utf-16 surrogate pairs.</span> |
| <span class="ident">Utf16Reserved</span>, |
| <span class="doccomment">/// It's higher than the highest codepoint of 0x10ffff.</span> |
| <span class="ident">TooHigh</span>, |
| } |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">InvalidCodePoint</span>::<span class="kw-2">*</span>; |
| <span class="kw">impl</span> <span class="ident">InvalidCodePoint</span> { |
| <span class="doccomment">/// Get the range of values for which this error would be given.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error_range</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="ident">u32</span>,<span class="ident">u32</span>) {<span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Utf16Reserved</span> <span class="op">=></span> (<span class="number">0xd8_00</span>, <span class="number">0xdf_ff</span>), |
| <span class="ident">TooHigh</span> <span class="op">=></span> (<span class="number">0x00_10_ff_ff</span>, <span class="number">0xff_ff_ff_ff</span>), |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidCodePoint</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Utf16Reserved</span> <span class="op">=></span> <span class="string">"is reserved for utf-16 surrogate pairs"</span>, |
| <span class="ident">TooHigh</span> <span class="op">=></span> <span class="string">"is higher than the highest codepoint of 0x10ffff"</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidCodePoint</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| |
| <span class="doccomment">/// Reasons why a byte is not the start of a UTF-8 codepoint.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf8FirstByte</span> { |
| <span class="doccomment">/// Sequences cannot be longer than 4 bytes. Is given for bytes >= 240.</span> |
| <span class="ident">TooLongSeqence</span>, |
| <span class="doccomment">/// This byte belongs to a previous seqence. Is given for values between 128 and 192 (exclusive).</span> |
| <span class="ident">ContinuationByte</span>, |
| } |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">InvalidUtf8FirstByte</span>::<span class="kw-2">*</span>; |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf8FirstByte</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">TooLongSeqence</span> <span class="op">=></span> <span class="string">"is greater than 239 (UTF-8 seqences cannot be longer than four bytes)"</span>, |
| <span class="ident">ContinuationByte</span> <span class="op">=></span> <span class="string">"is a continuation of a previous sequence"</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf8FirstByte</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| <span class="doccomment">/// Reasons why a byte sequence is not valid UTF-8, excluding invalid codepoint.</span> |
| <span class="doccomment">/// In sinking precedence.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf8</span> { |
| <span class="doccomment">/// Something is certainly wrong with the first byte.</span> |
| <span class="ident">FirstByte</span>(<span class="ident">InvalidUtf8FirstByte</span>), |
| <span class="doccomment">/// One of the continuation bytes doesnt fit the pattern 0b10xx_xxxx.</span> |
| <span class="ident">NotAContinuationByte</span>(<span class="ident">usize</span>), |
| <span class="doccomment">/// There are too many leading zeros; it could be a byte shorter.</span> |
| <span class="ident">OverLong</span>, |
| } |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">InvalidUtf8</span>::<span class="kw-2">*</span>; |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf8</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">FirstByte</span>(<span class="ident">TooLongSeqence</span>) <span class="op">=></span> <span class="string">"the first byte is greater than 239 (UTF-8 seqences cannot be longer than four bytes)"</span>, |
| <span class="ident">FirstByte</span>(<span class="ident">ContinuationByte</span>) <span class="op">=></span> <span class="string">"the first byte is a continuation of a previous sequence"</span>, |
| <span class="ident">OverLong</span> <span class="op">=></span> <span class="string">"the seqence contains too many zeros and could be shorter"</span>, |
| <span class="ident">NotAContinuationByte</span>(_) <span class="op">=></span> <span class="string">"the sequence is too short"</span>, |
| }} |
| <span class="doccomment">/// When `Some` is returned, the `Error` is a `InvalidUtf8FirstByte`.</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="op">></span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">FirstByte</span>(<span class="kw-2">ref</span> <span class="ident">cause</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">cause</span>), |
| _ <span class="op">=></span> <span class="prelude-val">None</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf8</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| <span class="doccomment">/// Reasons why a byte array is not valid UTF-8, in sinking precedence.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf8Array</span> { |
| <span class="doccomment">/// Something is certainly wrong with the first byte.</span> |
| <span class="ident">Utf8</span>(<span class="ident">InvalidUtf8</span>), |
| <span class="doccomment">/// The encoded codepoint is invalid:</span> |
| <span class="ident">CodePoint</span>(<span class="ident">InvalidCodePoint</span>), |
| } |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf8Array</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf8Array</span>::<span class="ident">Utf8</span>(_) <span class="op">=></span> <span class="string">"the seqence is invalid UTF-8"</span>, |
| <span class="ident">InvalidUtf8Array</span>::<span class="ident">CodePoint</span>(_) <span class="op">=></span> <span class="string">"the encoded codepoint is invalid"</span>, |
| }} |
| <span class="doccomment">/// Always returns `Some`.</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="op">></span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf8Array</span>::<span class="ident">Utf8</span>(<span class="kw-2">ref</span> <span class="ident">u</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">u</span>), |
| <span class="ident">InvalidUtf8Array</span>::<span class="ident">CodePoint</span>(<span class="kw-2">ref</span> <span class="ident">c</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">c</span>), |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf8Array</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}: {}"</span>, <span class="self">self</span>.<span class="ident">description</span>(), <span class="self">self</span>.<span class="ident">cause</span>().<span class="ident">unwrap</span>().<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| <span class="doccomment">/// Reasons why a byte slice is not valid UTF-8, in sinking precedence.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf8Slice</span> { |
| <span class="doccomment">/// Something is certainly wrong with the first byte.</span> |
| <span class="ident">Utf8</span>(<span class="ident">InvalidUtf8</span>), |
| <span class="doccomment">/// The encoded codepoint is invalid:</span> |
| <span class="ident">CodePoint</span>(<span class="ident">InvalidCodePoint</span>), |
| <span class="doccomment">/// The slice is too short; n bytes was required.</span> |
| <span class="ident">TooShort</span>(<span class="ident">usize</span>), |
| } |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf8Slice</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">Utf8</span>(_) <span class="op">=></span> <span class="string">"the seqence is invalid UTF-8"</span>, |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">CodePoint</span>(_) <span class="op">=></span> <span class="string">"the encoded codepoint is invalid"</span>, |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">TooShort</span>(<span class="number">0</span>) <span class="op">=></span> <span class="string">"the slice is empty"</span>, |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">TooShort</span>(_) <span class="op">=></span> <span class="string">"the slice is shorter than the seqence"</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="op">></span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">Utf8</span>(<span class="kw-2">ref</span> <span class="ident">u</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">u</span>), |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">CodePoint</span>(<span class="kw-2">ref</span> <span class="ident">c</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">c</span>), |
| <span class="ident">InvalidUtf8Slice</span>::<span class="ident">TooShort</span>(_) <span class="op">=></span> <span class="prelude-val">None</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf8Slice</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cause</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">d</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}: {}"</span>, <span class="self">self</span>.<span class="ident">description</span>(), <span class="ident">d</span>), |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()), |
| } |
| } |
| } |
| |
| |
| |
| <span class="doccomment">/// Reasons why one or two `u16`s are not valid UTF-16, in sinking precedence.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf16Tuple</span> { |
| <span class="doccomment">/// The first unit is a trailing/low surrogate, which is never valid.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that the value of a low surrogate is actually higher than a high surrogate.</span> |
| <span class="ident">FirstIsTrailingSurrogate</span>, |
| <span class="doccomment">/// You provided a second unit, but the first one stands on its own.</span> |
| <span class="ident">SuperfluousSecond</span>, |
| <span class="doccomment">/// The first and only unit requires a second unit.</span> |
| <span class="ident">MissingSecond</span>, |
| <span class="doccomment">/// The first unit requires a second unit, but it's not a trailing/low surrogate.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that the value of a low surrogate is actually higher than a high surrogate.</span> |
| <span class="ident">InvalidSecond</span>, |
| } |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf16Tuple</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf16Tuple</span>::<span class="ident">FirstIsTrailingSurrogate</span> <span class="op">=></span> <span class="string">"the first unit is a trailing / low surrogate, which is never valid"</span>, |
| <span class="ident">InvalidUtf16Tuple</span>::<span class="ident">SuperfluousSecond</span> <span class="op">=></span> <span class="string">"the second unit is superfluous"</span>, |
| <span class="ident">InvalidUtf16Tuple</span>::<span class="ident">MissingSecond</span> <span class="op">=></span> <span class="string">"the first unit requires a second unit"</span>, |
| <span class="ident">InvalidUtf16Tuple</span>::<span class="ident">InvalidSecond</span> <span class="op">=></span> <span class="string">"the required second unit is not a trailing / low surrogate"</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf16Tuple</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| |
| |
| <span class="doccomment">/// Reasons why a slice of `u16`s doesn't start with valid UTF-16.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">InvalidUtf16Slice</span> { |
| <span class="doccomment">/// The slice is empty.</span> |
| <span class="ident">EmptySlice</span>, |
| <span class="doccomment">/// The first unit is a low surrogate.</span> |
| <span class="ident">FirstLowSurrogate</span>, |
| <span class="doccomment">/// The first and only unit requires a second unit.</span> |
| <span class="ident">MissingSecond</span>, |
| <span class="doccomment">/// The first unit requires a second one, but it's not a low surrogate.</span> |
| <span class="ident">SecondNotLowSurrogate</span>, |
| } |
| <span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">InvalidUtf16Slice</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="lifetime">'static</span> <span class="ident">str</span> {<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InvalidUtf16Slice</span>::<span class="ident">EmptySlice</span> <span class="op">=></span> <span class="string">"the slice is empty"</span>, |
| <span class="ident">InvalidUtf16Slice</span>::<span class="ident">FirstLowSurrogate</span> <span class="op">=></span> <span class="string">"the first unit is a low surrogate"</span>, |
| <span class="ident">InvalidUtf16Slice</span>::<span class="ident">MissingSecond</span> <span class="op">=></span> <span class="string">"the first and only unit requires a second one"</span>, |
| <span class="ident">InvalidUtf16Slice</span>::<span class="ident">SecondNotLowSurrogate</span> <span class="op">=></span> <span class="string">"the required second unit is not a low surrogate"</span>, |
| }} |
| } |
| <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">InvalidUtf16Slice</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">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmtr</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">description</span>()) |
| } |
| } |
| </pre> |
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