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| </pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">Ident</span>, <span class="ident">Span</span>}; |
| <span class="kw">use</span> <span class="ident">std::borrow::Cow</span>; |
| <span class="kw">use</span> <span class="ident">std::fmt</span>; |
| |
| <span class="doccomment">/// Specialized formatting trait used by `format_ident!`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`Ident`] arguments formatted using this trait will have their `r#` prefix</span> |
| <span class="doccomment">/// stripped, if present.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See [`format_ident!`] for more information.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">IdentFragment</span> { |
| <span class="doccomment">/// Format this value as an identifier fragment.</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span>; |
| |
| <span class="doccomment">/// Span associated with this `IdentFragment`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If non-`None`, may be inherited by formatted identifiers.</span> |
| <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IdentFragment</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">IdentFragment</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">T</span> { |
| <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span> { |
| <span class="op"><</span><span class="ident">T</span> <span class="kw">as</span> <span class="ident">IdentFragment</span><span class="op">></span><span class="ident">::span</span>(<span class="kw-2">*</span><span class="self">self</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">IdentFragment::fmt</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IdentFragment</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">IdentFragment</span> <span class="kw">for</span> <span class="kw-2">&mut</span> <span class="ident">T</span> { |
| <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span> { |
| <span class="op"><</span><span class="ident">T</span> <span class="kw">as</span> <span class="ident">IdentFragment</span><span class="op">></span><span class="ident">::span</span>(<span class="kw-2">*</span><span class="self">self</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">IdentFragment::fmt</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">IdentFragment</span> <span class="kw">for</span> <span class="ident">Ident</span> { |
| <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">span</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_string</span>(); |
| <span class="kw">if</span> <span class="ident">id</span>.<span class="ident">starts_with</span>(<span class="string">"r#"</span>) { |
| <span class="ident">fmt::Display::fmt</span>(<span class="kw-2">&</span><span class="ident">id</span>[<span class="number">2</span>..], <span class="ident">f</span>) |
| } <span class="kw">else</span> { |
| <span class="ident">fmt::Display::fmt</span>(<span class="kw-2">&</span><span class="ident">id</span>[..], <span class="ident">f</span>) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IdentFragment</span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> |
| <span class="ident">T</span>: <span class="ident">IdentFragment</span> <span class="op">+</span> <span class="ident">ToOwned</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span>, |
| { |
| <span class="kw">fn</span> <span class="ident">span</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span> { |
| <span class="ident">T::span</span>(<span class="self">self</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">T::fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) |
| } |
| } |
| |
| <span class="comment">// Limited set of types which this is implemented for, as we want to avoid types</span> |
| <span class="comment">// which will often include non-identifier characters in their `Display` impl.</span> |
| <span class="macro">macro_rules!</span> <span class="ident">ident_fragment_display</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ty</span>),<span class="kw-2">*</span>) => { |
| $( |
| <span class="kw">impl</span> <span class="ident">IdentFragment</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</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">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">fmt::Display::fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) |
| } |
| } |
| )<span class="op">*</span> |
| }; |
| } |
| |
| <span class="macro">ident_fragment_display!</span>(<span class="ident">bool</span>, <span class="ident">str</span>, <span class="ident">String</span>, <span class="ident">char</span>); |
| <span class="macro">ident_fragment_display!</span>(<span class="ident">u8</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u64</span>, <span class="ident">u128</span>, <span class="ident">usize</span>); |
| </code></pre></div> |
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