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| </pre><pre class="rust"><code><span class="doccomment">//! A Serde ast, parsed from the Syn ast and ready to generate Rust code.</span> |
| |
| <span class="kw">use</span> <span class="ident">internals::attr</span>; |
| <span class="kw">use</span> <span class="ident">internals::check</span>; |
| <span class="kw">use</span> <span class="ident">internals</span>::{<span class="ident">Ctxt</span>, <span class="ident">Derive</span>}; |
| <span class="kw">use</span> <span class="ident">syn</span>; |
| <span class="kw">use</span> <span class="ident">syn::punctuated::Punctuated</span>; |
| |
| <span class="doccomment">/// A source data structure annotated with `#[derive(Serialize)]` and/or `#[derive(Deserialize)]`,</span> |
| <span class="doccomment">/// parsed into an internal representation.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Container</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="doccomment">/// The struct or enum name (without generics).</span> |
| <span class="kw">pub</span> <span class="ident">ident</span>: <span class="ident">syn::Ident</span>, |
| <span class="doccomment">/// Attributes on the structure, parsed for Serde.</span> |
| <span class="kw">pub</span> <span class="ident">attrs</span>: <span class="ident">attr::Container</span>, |
| <span class="doccomment">/// The contents of the struct or enum.</span> |
| <span class="kw">pub</span> <span class="ident">data</span>: <span class="ident">Data</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, |
| <span class="doccomment">/// Any generics on the struct or enum.</span> |
| <span class="kw">pub</span> <span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::Generics</span>, |
| <span class="doccomment">/// Original input.</span> |
| <span class="kw">pub</span> <span class="ident">original</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::DeriveInput</span>, |
| } |
| |
| <span class="doccomment">/// The fields of a struct or enum.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Analogous to `syn::Data`.</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Data</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="ident">Enum</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">Variant</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span>), |
| <span class="ident">Struct</span>(<span class="ident">Style</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span>), |
| } |
| |
| <span class="doccomment">/// A variant of an enum.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Variant</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">pub</span> <span class="ident">ident</span>: <span class="ident">syn::Ident</span>, |
| <span class="kw">pub</span> <span class="ident">attrs</span>: <span class="ident">attr::Variant</span>, |
| <span class="kw">pub</span> <span class="ident">style</span>: <span class="ident">Style</span>, |
| <span class="kw">pub</span> <span class="ident">fields</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">original</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::Variant</span>, |
| } |
| |
| <span class="doccomment">/// A field of a struct.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">pub</span> <span class="ident">member</span>: <span class="ident">syn::Member</span>, |
| <span class="kw">pub</span> <span class="ident">attrs</span>: <span class="ident">attr::Field</span>, |
| <span class="kw">pub</span> <span class="ident">ty</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::Type</span>, |
| <span class="kw">pub</span> <span class="ident">original</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::Field</span>, |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Style</span> { |
| <span class="doccomment">/// Named fields.</span> |
| <span class="ident">Struct</span>, |
| <span class="doccomment">/// Many unnamed fields.</span> |
| <span class="ident">Tuple</span>, |
| <span class="doccomment">/// One unnamed field.</span> |
| <span class="ident">Newtype</span>, |
| <span class="doccomment">/// No fields.</span> |
| <span class="ident">Unit</span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Container</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="doccomment">/// Convert the raw Syn ast into a parsed container object, collecting errors in `cx`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ast</span>( |
| <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, |
| <span class="ident">item</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::DeriveInput</span>, |
| <span class="ident">derive</span>: <span class="ident">Derive</span>, |
| ) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Container</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attrs</span> <span class="op">=</span> <span class="ident">attr::Container::from_ast</span>(<span class="ident">cx</span>, <span class="ident">item</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">item</span>.<span class="ident">data</span> { |
| <span class="ident">syn::Data::Enum</span>(<span class="ident">data</span>) => <span class="ident">Data::Enum</span>(<span class="ident">enum_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">data</span>.<span class="ident">variants</span>, <span class="ident">attrs</span>.<span class="ident">default</span>())), |
| <span class="ident">syn::Data::Struct</span>(<span class="ident">data</span>) => { |
| <span class="kw">let</span> (<span class="ident">style</span>, <span class="ident">fields</span>) <span class="op">=</span> <span class="ident">struct_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">data</span>.<span class="ident">fields</span>, <span class="prelude-val">None</span>, <span class="ident">attrs</span>.<span class="ident">default</span>()); |
| <span class="ident">Data::Struct</span>(<span class="ident">style</span>, <span class="ident">fields</span>) |
| } |
| <span class="ident">syn::Data::Union</span>(<span class="kw">_</span>) => { |
| <span class="ident">cx</span>.<span class="ident">error_spanned_by</span>(<span class="ident">item</span>, <span class="string">"Serde does not support derive for unions"</span>); |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| }; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_flatten</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">match</span> <span class="kw-2">&mut</span> <span class="ident">data</span> { |
| <span class="ident">Data::Enum</span>(<span class="ident">variants</span>) => { |
| <span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="ident">variants</span> { |
| <span class="ident">variant</span>.<span class="ident">attrs</span>.<span class="ident">rename_by_rules</span>(<span class="ident">attrs</span>.<span class="ident">rename_all_rules</span>()); |
| <span class="kw">for</span> <span class="ident">field</span> <span class="kw">in</span> <span class="kw-2">&mut</span> <span class="ident">variant</span>.<span class="ident">fields</span> { |
| <span class="kw">if</span> <span class="ident">field</span>.<span class="ident">attrs</span>.<span class="ident">flatten</span>() { |
| <span class="ident">has_flatten</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| } |
| <span class="ident">field</span> |
| .<span class="ident">attrs</span> |
| .<span class="ident">rename_by_rules</span>(<span class="ident">variant</span>.<span class="ident">attrs</span>.<span class="ident">rename_all_rules</span>()); |
| } |
| } |
| } |
| <span class="ident">Data::Struct</span>(<span class="kw">_</span>, <span class="ident">fields</span>) => { |
| <span class="kw">for</span> <span class="ident">field</span> <span class="kw">in</span> <span class="ident">fields</span> { |
| <span class="kw">if</span> <span class="ident">field</span>.<span class="ident">attrs</span>.<span class="ident">flatten</span>() { |
| <span class="ident">has_flatten</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| } |
| <span class="ident">field</span>.<span class="ident">attrs</span>.<span class="ident">rename_by_rules</span>(<span class="ident">attrs</span>.<span class="ident">rename_all_rules</span>()); |
| } |
| } |
| } |
| |
| <span class="kw">if</span> <span class="ident">has_flatten</span> { |
| <span class="ident">attrs</span>.<span class="ident">mark_has_flatten</span>(); |
| } |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">item</span> <span class="op">=</span> <span class="ident">Container</span> { |
| <span class="ident">ident</span>: <span class="ident">item</span>.<span class="ident">ident</span>.<span class="ident">clone</span>(), |
| <span class="ident">attrs</span>, |
| <span class="ident">data</span>, |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">item</span>.<span class="ident">generics</span>, |
| <span class="ident">original</span>: <span class="ident">item</span>, |
| }; |
| <span class="ident">check::check</span>(<span class="ident">cx</span>, <span class="kw-2">&mut</span> <span class="ident">item</span>, <span class="ident">derive</span>); |
| <span class="prelude-val">Some</span>(<span class="ident">item</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Data</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_fields</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) -> <span class="ident">Box</span><span class="op"><</span><span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Data::Enum</span>(<span class="ident">variants</span>) => { |
| <span class="ident">Box::new</span>(<span class="ident">variants</span>.<span class="ident">iter</span>().<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> <span class="ident">variant</span>.<span class="ident">fields</span>.<span class="ident">iter</span>())) |
| } |
| <span class="ident">Data::Struct</span>(<span class="kw">_</span>, <span class="ident">fields</span>) => <span class="ident">Box::new</span>(<span class="ident">fields</span>.<span class="ident">iter</span>()), |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_getter</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">all_fields</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">f</span><span class="op">|</span> <span class="ident">f</span>.<span class="ident">attrs</span>.<span class="ident">getter</span>().<span class="ident">is_some</span>()) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">enum_from_ast</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>( |
| <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, |
| <span class="ident">variants</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">syn::Variant</span>, <span class="macro">Token!</span>[,]<span class="op">></span>, |
| <span class="ident">container_default</span>: <span class="kw-2">&</span><span class="ident">attr::Default</span>, |
| ) -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Variant</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> { |
| <span class="ident">variants</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> { |
| <span class="kw">let</span> <span class="ident">attrs</span> <span class="op">=</span> <span class="ident">attr::Variant::from_ast</span>(<span class="ident">cx</span>, <span class="ident">variant</span>); |
| <span class="kw">let</span> (<span class="ident">style</span>, <span class="ident">fields</span>) <span class="op">=</span> |
| <span class="ident">struct_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">fields</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">attrs</span>), <span class="ident">container_default</span>); |
| <span class="ident">Variant</span> { |
| <span class="ident">ident</span>: <span class="ident">variant</span>.<span class="ident">ident</span>.<span class="ident">clone</span>(), |
| <span class="ident">attrs</span>, |
| <span class="ident">style</span>, |
| <span class="ident">fields</span>, |
| <span class="ident">original</span>: <span class="ident">variant</span>, |
| } |
| }) |
| .<span class="ident">collect</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">struct_from_ast</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>( |
| <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, |
| <span class="ident">fields</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">syn::Fields</span>, |
| <span class="ident">attrs</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">attr::Variant</span><span class="op">></span>, |
| <span class="ident">container_default</span>: <span class="kw-2">&</span><span class="ident">attr::Default</span>, |
| ) -> (<span class="ident">Style</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span>) { |
| <span class="kw">match</span> <span class="ident">fields</span> { |
| <span class="ident">syn::Fields::Named</span>(<span class="ident">fields</span>) => ( |
| <span class="ident">Style::Struct</span>, |
| <span class="ident">fields_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">fields</span>.<span class="ident">named</span>, <span class="ident">attrs</span>, <span class="ident">container_default</span>), |
| ), |
| <span class="ident">syn::Fields::Unnamed</span>(<span class="ident">fields</span>) <span class="kw">if</span> <span class="ident">fields</span>.<span class="ident">unnamed</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> => ( |
| <span class="ident">Style::Newtype</span>, |
| <span class="ident">fields_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">fields</span>.<span class="ident">unnamed</span>, <span class="ident">attrs</span>, <span class="ident">container_default</span>), |
| ), |
| <span class="ident">syn::Fields::Unnamed</span>(<span class="ident">fields</span>) => ( |
| <span class="ident">Style::Tuple</span>, |
| <span class="ident">fields_from_ast</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">fields</span>.<span class="ident">unnamed</span>, <span class="ident">attrs</span>, <span class="ident">container_default</span>), |
| ), |
| <span class="ident">syn::Fields::Unit</span> => (<span class="ident">Style::Unit</span>, <span class="ident">Vec::new</span>()), |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">fields_from_ast</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>( |
| <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, |
| <span class="ident">fields</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">syn::Field</span>, <span class="macro">Token!</span>[,]<span class="op">></span>, |
| <span class="ident">attrs</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">attr::Variant</span><span class="op">></span>, |
| <span class="ident">container_default</span>: <span class="kw-2">&</span><span class="ident">attr::Default</span>, |
| ) -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Field</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span><span class="op">></span> { |
| <span class="ident">fields</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">enumerate</span>() |
| .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">i</span>, <span class="ident">field</span>)<span class="op">|</span> <span class="ident">Field</span> { |
| <span class="ident">member</span>: <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ident</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">ident</span>) => <span class="ident">syn::Member::Named</span>(<span class="ident">ident</span>.<span class="ident">clone</span>()), |
| <span class="prelude-val">None</span> => <span class="ident">syn::Member::Unnamed</span>(<span class="ident">i</span>.<span class="ident">into</span>()), |
| }, |
| <span class="ident">attrs</span>: <span class="ident">attr::Field::from_ast</span>(<span class="ident">cx</span>, <span class="ident">i</span>, <span class="ident">field</span>, <span class="ident">attrs</span>, <span class="ident">container_default</span>), |
| <span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>, |
| <span class="ident">original</span>: <span class="ident">field</span>, |
| }) |
| .<span class="ident">collect</span>() |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="serde_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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