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| <span id="2"> 2</span> |
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| <span id="4"> 4</span> |
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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">TokenStream</span>}; |
| <span class="kw">use</span> <span class="ident">quote::format_ident</span>; |
| |
| <span class="kw">use</span> <span class="ident">syn</span>; |
| <span class="kw">use</span> <span class="ident">try</span>; |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wrap_in_const</span>( |
| <span class="ident">serde_path</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn::Path</span><span class="op">></span>, |
| <span class="ident">trait_</span>: <span class="kw-2">&</span><span class="ident">str</span>, |
| <span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">Ident</span>, |
| <span class="ident">code</span>: <span class="ident">TokenStream</span>, |
| ) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">try_replacement</span> <span class="op">=</span> <span class="ident">try::replacement</span>(); |
| |
| <span class="kw">let</span> <span class="ident">dummy_const</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg!</span>(<span class="ident">underscore_consts</span>) { |
| <span class="macro">format_ident!</span>(<span class="string">"_"</span>) |
| } <span class="kw">else</span> { |
| <span class="macro">format_ident!</span>(<span class="string">"_IMPL_{}_FOR_{}"</span>, <span class="ident">trait_</span>, <span class="ident">unraw</span>(<span class="ident">ty</span>)) |
| }; |
| |
| <span class="kw">let</span> <span class="ident">use_serde</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">serde_path</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">path</span>) => <span class="macro">quote!</span> { |
| <span class="kw">use</span> #<span class="ident">path</span> <span class="kw">as</span> <span class="ident">_serde</span>; |
| }, |
| <span class="prelude-val">None</span> => <span class="macro">quote!</span> { |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_extern_crates</span>, <span class="ident">clippy::useless_attribute</span>)]</span> |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde</span> <span class="kw">as</span> <span class="ident">_serde</span>; |
| }, |
| }; |
| |
| <span class="macro">quote!</span> { |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_upper_case_globals</span>, <span class="ident">unused_attributes</span>, <span class="ident">unused_qualifications</span>)]</span> |
| <span class="kw">const</span> #<span class="ident">dummy_const</span>: () <span class="op">=</span> { |
| #<span class="ident">use_serde</span> |
| #<span class="ident">try_replacement</span> |
| #<span class="ident">code</span> |
| }; |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">unraw</span>(<span class="ident">ident</span>: <span class="kw-2">&</span><span class="ident">Ident</span>) -> <span class="ident">String</span> { |
| <span class="comment">// str::trim_start_matches was added in 1.30, trim_left_matches deprecated</span> |
| <span class="comment">// in 1.33. We currently support rustc back to 1.15 so we need to continue</span> |
| <span class="comment">// to use the deprecated one.</span> |
| <span class="ident">ident</span>.<span class="ident">to_string</span>().<span class="ident">trim_left_matches</span>(<span class="string">"r#"</span>).<span class="ident">to_owned</span>() |
| } |
| </code></pre></div> |
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