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| </pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::collections::HashSet</span>; |
| |
| <span class="kw">use</span> <span class="ident">syn</span>; |
| <span class="kw">use</span> <span class="ident">syn::punctuated</span>::{<span class="ident">Pair</span>, <span class="ident">Punctuated</span>}; |
| |
| <span class="kw">use</span> <span class="ident">internals::ast</span>::{<span class="ident">Container</span>, <span class="ident">Data</span>}; |
| <span class="kw">use</span> <span class="ident">internals</span>::{<span class="ident">attr</span>, <span class="ident">ungroup</span>}; |
| |
| <span class="kw">use</span> <span class="ident">proc_macro2::Span</span>; |
| |
| <span class="comment">// Remove the default from every type parameter because in the generated impls</span> |
| <span class="comment">// they look like associated types: "error: associated type bindings are not</span> |
| <span class="comment">// allowed here".</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">without_defaults</span>(<span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>) -> <span class="ident">syn::Generics</span> { |
| <span class="ident">syn::Generics</span> { |
| <span class="ident">params</span>: <span class="ident">generics</span> |
| .<span class="ident">params</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">param</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">param</span> { |
| <span class="ident">syn::GenericParam::Type</span>(<span class="ident">param</span>) => <span class="ident">syn::GenericParam::Type</span>(<span class="ident">syn::TypeParam</span> { |
| <span class="ident">eq_token</span>: <span class="prelude-val">None</span>, |
| <span class="ident">default</span>: <span class="prelude-val">None</span>, |
| ..<span class="ident">param</span>.<span class="ident">clone</span>() |
| }), |
| <span class="kw">_</span> => <span class="ident">param</span>.<span class="ident">clone</span>(), |
| }) |
| .<span class="ident">collect</span>(), |
| ..<span class="ident">generics</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_where_predicates</span>( |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, |
| <span class="ident">predicates</span>: <span class="kw-2">&</span>[<span class="ident">syn::WherePredicate</span>], |
| ) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| <span class="ident">generics</span> |
| .<span class="ident">make_where_clause</span>() |
| .<span class="ident">predicates</span> |
| .<span class="ident">extend</span>(<span class="ident">predicates</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()); |
| <span class="ident">generics</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_where_predicates_from_fields</span>( |
| <span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, |
| <span class="ident">from_field</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">attr::Field</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn::WherePredicate</span>]<span class="op">></span>, |
| ) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">let</span> <span class="ident">predicates</span> <span class="op">=</span> <span class="ident">cont</span> |
| .<span class="ident">data</span> |
| .<span class="ident">all_fields</span>() |
| .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="ident">from_field</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">attrs</span>)) |
| .<span class="ident">flat_map</span>(<span class="op"><</span>[<span class="ident">syn::WherePredicate</span>]<span class="op">></span><span class="ident">::to_vec</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| <span class="ident">generics</span>.<span class="ident">make_where_clause</span>().<span class="ident">predicates</span>.<span class="ident">extend</span>(<span class="ident">predicates</span>); |
| <span class="ident">generics</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_where_predicates_from_variants</span>( |
| <span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, |
| <span class="ident">from_variant</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">attr::Variant</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn::WherePredicate</span>]<span class="op">></span>, |
| ) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">let</span> <span class="ident">variants</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">data</span> { |
| <span class="ident">Data::Enum</span>(<span class="ident">variants</span>) => <span class="ident">variants</span>, |
| <span class="ident">Data::Struct</span>(<span class="kw">_</span>, <span class="kw">_</span>) => { |
| <span class="kw">return</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| } |
| }; |
| |
| <span class="kw">let</span> <span class="ident">predicates</span> <span class="op">=</span> <span class="ident">variants</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> <span class="ident">from_variant</span>(<span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">attrs</span>)) |
| .<span class="ident">flat_map</span>(<span class="op"><</span>[<span class="ident">syn::WherePredicate</span>]<span class="op">></span><span class="ident">::to_vec</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| <span class="ident">generics</span>.<span class="ident">make_where_clause</span>().<span class="ident">predicates</span>.<span class="ident">extend</span>(<span class="ident">predicates</span>); |
| <span class="ident">generics</span> |
| } |
| |
| <span class="comment">// Puts the given bound on any generic type parameters that are used in fields</span> |
| <span class="comment">// for which filter returns true.</span> |
| <span class="comment">//</span> |
| <span class="comment">// For example, the following struct needs the bound `A: Serialize, B:</span> |
| <span class="comment">// Serialize`.</span> |
| <span class="comment">//</span> |
| <span class="comment">// struct S<'b, A, B: 'b, C> {</span> |
| <span class="comment">// a: A,</span> |
| <span class="comment">// b: Option<&'b B></span> |
| <span class="comment">// #[serde(skip_serializing)]</span> |
| <span class="comment">// c: C,</span> |
| <span class="comment">// }</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_bound</span>( |
| <span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, |
| <span class="ident">filter</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">attr::Field</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">bool</span>, |
| <span class="ident">bound</span>: <span class="kw-2">&</span><span class="ident">syn::Path</span>, |
| ) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">struct</span> <span class="ident">FindTyParams</span><span class="op"><</span><span class="lifetime">'ast</span><span class="op">></span> { |
| <span class="comment">// Set of all generic type parameters on the current struct (A, B, C in</span> |
| <span class="comment">// the example). Initialized up front.</span> |
| <span class="ident">all_type_params</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">syn::Ident</span><span class="op">></span>, |
| |
| <span class="comment">// Set of generic type parameters used in fields for which filter</span> |
| <span class="comment">// returns true (A and B in the example). Filled in as the visitor sees</span> |
| <span class="comment">// them.</span> |
| <span class="ident">relevant_type_params</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">syn::Ident</span><span class="op">></span>, |
| |
| <span class="comment">// Fields whose type is an associated type of one of the generic type</span> |
| <span class="comment">// parameters.</span> |
| <span class="ident">associated_type_usage</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::TypePath</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'ast</span><span class="op">></span> <span class="ident">FindTyParams</span><span class="op"><</span><span class="lifetime">'ast</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">visit_field</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">field</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::Field</span>) { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="ident">syn::Type::Path</span>(<span class="ident">ty</span>) <span class="op">=</span> <span class="ident">ungroup</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>) { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">Pair::Punctuated</span>(<span class="ident">t</span>, <span class="kw">_</span>)) <span class="op">=</span> <span class="ident">ty</span>.<span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">pairs</span>().<span class="ident">next</span>() { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">all_type_params</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">t</span>.<span class="ident">ident</span>) { |
| <span class="self">self</span>.<span class="ident">associated_type_usage</span>.<span class="ident">push</span>(<span class="ident">ty</span>); |
| } |
| } |
| } |
| <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visit_path</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">path</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::Path</span>) { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">seg</span>) <span class="op">=</span> <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">last</span>() { |
| <span class="kw">if</span> <span class="ident">seg</span>.<span class="ident">ident</span> <span class="op">==</span> <span class="string">"PhantomData"</span> { |
| <span class="comment">// Hardcoded exception, because PhantomData<T> implements</span> |
| <span class="comment">// Serialize and Deserialize whether or not T implements it.</span> |
| <span class="kw">return</span>; |
| } |
| } |
| <span class="kw">if</span> <span class="ident">path</span>.<span class="ident">leading_colon</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> { |
| <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">path</span>.<span class="ident">segments</span>[<span class="number">0</span>].<span class="ident">ident</span>; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">all_type_params</span>.<span class="ident">contains</span>(<span class="ident">id</span>) { |
| <span class="self">self</span>.<span class="ident">relevant_type_params</span>.<span class="ident">insert</span>(<span class="ident">id</span>.<span class="ident">clone</span>()); |
| } |
| } |
| <span class="kw">for</span> <span class="ident">segment</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">path</span>.<span class="ident">segments</span> { |
| <span class="self">self</span>.<span class="ident">visit_path_segment</span>(<span class="ident">segment</span>); |
| } |
| } |
| |
| <span class="comment">// Everything below is simply traversing the syntax tree.</span> |
| |
| <span class="kw">fn</span> <span class="ident">visit_type</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ty</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::Type</span>) { |
| <span class="kw">match</span> <span class="ident">ty</span> { |
| <span class="ident">syn::Type::Array</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::BareFn</span>(<span class="ident">ty</span>) => { |
| <span class="kw">for</span> <span class="ident">arg</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">inputs</span> { |
| <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">ty</span>); |
| } |
| <span class="self">self</span>.<span class="ident">visit_return_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">output</span>); |
| } |
| <span class="ident">syn::Type::Group</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::ImplTrait</span>(<span class="ident">ty</span>) => { |
| <span class="kw">for</span> <span class="ident">bound</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">bounds</span> { |
| <span class="self">self</span>.<span class="ident">visit_type_param_bound</span>(<span class="ident">bound</span>); |
| } |
| } |
| <span class="ident">syn::Type::Macro</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_macro</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">mac</span>), |
| <span class="ident">syn::Type::Paren</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::Path</span>(<span class="ident">ty</span>) => { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">qself</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">qself</span> { |
| <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">qself</span>.<span class="ident">ty</span>); |
| } |
| <span class="self">self</span>.<span class="ident">visit_path</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">path</span>); |
| } |
| <span class="ident">syn::Type::Ptr</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::Reference</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::Slice</span>(<span class="ident">ty</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elem</span>), |
| <span class="ident">syn::Type::TraitObject</span>(<span class="ident">ty</span>) => { |
| <span class="kw">for</span> <span class="ident">bound</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">bounds</span> { |
| <span class="self">self</span>.<span class="ident">visit_type_param_bound</span>(<span class="ident">bound</span>); |
| } |
| } |
| <span class="ident">syn::Type::Tuple</span>(<span class="ident">ty</span>) => { |
| <span class="kw">for</span> <span class="ident">elem</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">ty</span>.<span class="ident">elems</span> { |
| <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="ident">elem</span>); |
| } |
| } |
| |
| <span class="ident">syn::Type::Infer</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">syn::Type::Never</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">syn::Type::Verbatim</span>(<span class="kw">_</span>) => {} |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="ident">syn::Type::__TestExhaustive</span>(<span class="kw">_</span>) => <span class="macro">unimplemented!</span>(), |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span> |
| <span class="kw">_</span> => {} |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visit_path_segment</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">segment</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::PathSegment</span>) { |
| <span class="self">self</span>.<span class="ident">visit_path_arguments</span>(<span class="kw-2">&</span><span class="ident">segment</span>.<span class="ident">arguments</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visit_path_arguments</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">arguments</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::PathArguments</span>) { |
| <span class="kw">match</span> <span class="ident">arguments</span> { |
| <span class="ident">syn::PathArguments::None</span> => {} |
| <span class="ident">syn::PathArguments::AngleBracketed</span>(<span class="ident">arguments</span>) => { |
| <span class="kw">for</span> <span class="ident">arg</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">arguments</span>.<span class="ident">args</span> { |
| <span class="kw">match</span> <span class="ident">arg</span> { |
| <span class="ident">syn::GenericArgument::Type</span>(<span class="ident">arg</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="ident">arg</span>), |
| <span class="ident">syn::GenericArgument::Binding</span>(<span class="ident">arg</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">ty</span>), |
| <span class="ident">syn::GenericArgument::Lifetime</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">syn::GenericArgument::Constraint</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">syn::GenericArgument::Const</span>(<span class="kw">_</span>) => {} |
| } |
| } |
| } |
| <span class="ident">syn::PathArguments::Parenthesized</span>(<span class="ident">arguments</span>) => { |
| <span class="kw">for</span> <span class="ident">argument</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">arguments</span>.<span class="ident">inputs</span> { |
| <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="ident">argument</span>); |
| } |
| <span class="self">self</span>.<span class="ident">visit_return_type</span>(<span class="kw-2">&</span><span class="ident">arguments</span>.<span class="ident">output</span>); |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visit_return_type</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">return_type</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::ReturnType</span>) { |
| <span class="kw">match</span> <span class="ident">return_type</span> { |
| <span class="ident">syn::ReturnType::Default</span> => {} |
| <span class="ident">syn::ReturnType::Type</span>(<span class="kw">_</span>, <span class="ident">output</span>) => <span class="self">self</span>.<span class="ident">visit_type</span>(<span class="ident">output</span>), |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visit_type_param_bound</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">bound</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::TypeParamBound</span>) { |
| <span class="kw">match</span> <span class="ident">bound</span> { |
| <span class="ident">syn::TypeParamBound::Trait</span>(<span class="ident">bound</span>) => <span class="self">self</span>.<span class="ident">visit_path</span>(<span class="kw-2">&</span><span class="ident">bound</span>.<span class="ident">path</span>), |
| <span class="ident">syn::TypeParamBound::Lifetime</span>(<span class="kw">_</span>) => {} |
| } |
| } |
| |
| <span class="comment">// Type parameter should not be considered used by a macro path.</span> |
| <span class="comment">//</span> |
| <span class="comment">// struct TypeMacro<T> {</span> |
| <span class="comment">// mac: T!(),</span> |
| <span class="comment">// marker: PhantomData<T>,</span> |
| <span class="comment">// }</span> |
| <span class="kw">fn</span> <span class="ident">visit_macro</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">_mac</span>: <span class="kw-2">&</span><span class="lifetime">'ast</span> <span class="ident">syn::Macro</span>) {} |
| } |
| |
| <span class="kw">let</span> <span class="ident">all_type_params</span> <span class="op">=</span> <span class="ident">generics</span> |
| .<span class="ident">type_params</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">param</span><span class="op">|</span> <span class="ident">param</span>.<span class="ident">ident</span>.<span class="ident">clone</span>()) |
| .<span class="ident">collect</span>(); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">visitor</span> <span class="op">=</span> <span class="ident">FindTyParams</span> { |
| <span class="ident">all_type_params</span>, |
| <span class="ident">relevant_type_params</span>: <span class="ident">HashSet::new</span>(), |
| <span class="ident">associated_type_usage</span>: <span class="ident">Vec::new</span>(), |
| }; |
| <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">cont</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">iter</span>() { |
| <span class="kw">let</span> <span class="ident">relevant_fields</span> <span class="op">=</span> <span class="ident">variant</span> |
| .<span class="ident">fields</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">filter</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="ident">filter</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">attrs</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">attrs</span>))); |
| <span class="kw">for</span> <span class="ident">field</span> <span class="kw">in</span> <span class="ident">relevant_fields</span> { |
| <span class="ident">visitor</span>.<span class="ident">visit_field</span>(<span class="ident">field</span>.<span class="ident">original</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="ident">iter</span>().<span class="ident">filter</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="ident">filter</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">attrs</span>, <span class="prelude-val">None</span>)) { |
| <span class="ident">visitor</span>.<span class="ident">visit_field</span>(<span class="ident">field</span>.<span class="ident">original</span>); |
| } |
| } |
| } |
| |
| <span class="kw">let</span> <span class="ident">relevant_type_params</span> <span class="op">=</span> <span class="ident">visitor</span>.<span class="ident">relevant_type_params</span>; |
| <span class="kw">let</span> <span class="ident">associated_type_usage</span> <span class="op">=</span> <span class="ident">visitor</span>.<span class="ident">associated_type_usage</span>; |
| <span class="kw">let</span> <span class="ident">new_predicates</span> <span class="op">=</span> <span class="ident">generics</span> |
| .<span class="ident">type_params</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">param</span><span class="op">|</span> <span class="ident">param</span>.<span class="ident">ident</span>.<span class="ident">clone</span>()) |
| .<span class="ident">filter</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="ident">relevant_type_params</span>.<span class="ident">contains</span>(<span class="ident">id</span>)) |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">id</span><span class="op">|</span> <span class="ident">syn::TypePath</span> { |
| <span class="ident">qself</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">id</span>.<span class="ident">into</span>(), |
| }) |
| .<span class="ident">chain</span>(<span class="ident">associated_type_usage</span>.<span class="ident">into_iter</span>().<span class="ident">cloned</span>()) |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">bounded_ty</span><span class="op">|</span> { |
| <span class="ident">syn::WherePredicate::Type</span>(<span class="ident">syn::PredicateType</span> { |
| <span class="ident">lifetimes</span>: <span class="prelude-val">None</span>, |
| <span class="comment">// the type parameter that is being bounded e.g. T</span> |
| <span class="ident">bounded_ty</span>: <span class="ident">syn::Type::Path</span>(<span class="ident">bounded_ty</span>), |
| <span class="ident">colon_token</span>: <span class="op"><</span><span class="macro">Token!</span>[:]<span class="op">></span><span class="ident">::default</span>(), |
| <span class="comment">// the bound e.g. Serialize</span> |
| <span class="ident">bounds</span>: <span class="macro">vec!</span>[<span class="ident">syn::TypeParamBound::Trait</span>(<span class="ident">syn::TraitBound</span> { |
| <span class="ident">paren_token</span>: <span class="prelude-val">None</span>, |
| <span class="ident">modifier</span>: <span class="ident">syn::TraitBoundModifier::None</span>, |
| <span class="ident">lifetimes</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">bound</span>.<span class="ident">clone</span>(), |
| })] |
| .<span class="ident">into_iter</span>() |
| .<span class="ident">collect</span>(), |
| }) |
| }); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| <span class="ident">generics</span> |
| .<span class="ident">make_where_clause</span>() |
| .<span class="ident">predicates</span> |
| .<span class="ident">extend</span>(<span class="ident">new_predicates</span>); |
| <span class="ident">generics</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_self_bound</span>( |
| <span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, |
| <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, |
| <span class="ident">bound</span>: <span class="kw-2">&</span><span class="ident">syn::Path</span>, |
| ) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>(); |
| <span class="ident">generics</span> |
| .<span class="ident">make_where_clause</span>() |
| .<span class="ident">predicates</span> |
| .<span class="ident">push</span>(<span class="ident">syn::WherePredicate::Type</span>(<span class="ident">syn::PredicateType</span> { |
| <span class="ident">lifetimes</span>: <span class="prelude-val">None</span>, |
| <span class="comment">// the type that is being bounded e.g. MyStruct<'a, T></span> |
| <span class="ident">bounded_ty</span>: <span class="ident">type_of_item</span>(<span class="ident">cont</span>), |
| <span class="ident">colon_token</span>: <span class="op"><</span><span class="macro">Token!</span>[:]<span class="op">></span><span class="ident">::default</span>(), |
| <span class="comment">// the bound e.g. Default</span> |
| <span class="ident">bounds</span>: <span class="macro">vec!</span>[<span class="ident">syn::TypeParamBound::Trait</span>(<span class="ident">syn::TraitBound</span> { |
| <span class="ident">paren_token</span>: <span class="prelude-val">None</span>, |
| <span class="ident">modifier</span>: <span class="ident">syn::TraitBoundModifier::None</span>, |
| <span class="ident">lifetimes</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">bound</span>.<span class="ident">clone</span>(), |
| })] |
| .<span class="ident">into_iter</span>() |
| .<span class="ident">collect</span>(), |
| })); |
| <span class="ident">generics</span> |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_lifetime_bound</span>(<span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">syn::Generics</span>, <span class="ident">lifetime</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="ident">syn::Generics</span> { |
| <span class="kw">let</span> <span class="ident">bound</span> <span class="op">=</span> <span class="ident">syn::Lifetime::new</span>(<span class="ident">lifetime</span>, <span class="ident">Span::call_site</span>()); |
| <span class="kw">let</span> <span class="ident">def</span> <span class="op">=</span> <span class="ident">syn::LifetimeDef</span> { |
| <span class="ident">attrs</span>: <span class="ident">Vec::new</span>(), |
| <span class="ident">lifetime</span>: <span class="ident">bound</span>.<span class="ident">clone</span>(), |
| <span class="ident">colon_token</span>: <span class="prelude-val">None</span>, |
| <span class="ident">bounds</span>: <span class="ident">Punctuated::new</span>(), |
| }; |
| |
| <span class="kw">let</span> <span class="ident">params</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">syn::GenericParam::Lifetime</span>(<span class="ident">def</span>)) |
| .<span class="ident">into_iter</span>() |
| .<span class="ident">chain</span>(<span class="ident">generics</span>.<span class="ident">params</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">param</span><span class="op">|</span> { |
| <span class="kw">match</span> <span class="kw-2">&mut</span> <span class="ident">param</span> { |
| <span class="ident">syn::GenericParam::Lifetime</span>(<span class="ident">param</span>) => { |
| <span class="ident">param</span>.<span class="ident">bounds</span>.<span class="ident">push</span>(<span class="ident">bound</span>.<span class="ident">clone</span>()); |
| } |
| <span class="ident">syn::GenericParam::Type</span>(<span class="ident">param</span>) => { |
| <span class="ident">param</span> |
| .<span class="ident">bounds</span> |
| .<span class="ident">push</span>(<span class="ident">syn::TypeParamBound::Lifetime</span>(<span class="ident">bound</span>.<span class="ident">clone</span>())); |
| } |
| <span class="ident">syn::GenericParam::Const</span>(<span class="kw">_</span>) => {} |
| } |
| <span class="ident">param</span> |
| })) |
| .<span class="ident">collect</span>(); |
| |
| <span class="ident">syn::Generics</span> { |
| <span class="ident">params</span>, |
| ..<span class="ident">generics</span>.<span class="ident">clone</span>() |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">type_of_item</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>) -> <span class="ident">syn::Type</span> { |
| <span class="ident">syn::Type::Path</span>(<span class="ident">syn::TypePath</span> { |
| <span class="ident">qself</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">syn::Path</span> { |
| <span class="ident">leading_colon</span>: <span class="prelude-val">None</span>, |
| <span class="ident">segments</span>: <span class="macro">vec!</span>[<span class="ident">syn::PathSegment</span> { |
| <span class="ident">ident</span>: <span class="ident">cont</span>.<span class="ident">ident</span>.<span class="ident">clone</span>(), |
| <span class="ident">arguments</span>: <span class="ident">syn::PathArguments::AngleBracketed</span>( |
| <span class="ident">syn::AngleBracketedGenericArguments</span> { |
| <span class="ident">colon2_token</span>: <span class="prelude-val">None</span>, |
| <span class="ident">lt_token</span>: <span class="op"><</span><span class="macro">Token!</span>[<span class="op"><</span>]<span class="op">></span><span class="ident">::default</span>(), |
| <span class="ident">args</span>: <span class="ident">cont</span> |
| .<span class="ident">generics</span> |
| .<span class="ident">params</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">param</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">param</span> { |
| <span class="ident">syn::GenericParam::Type</span>(<span class="ident">param</span>) => { |
| <span class="ident">syn::GenericArgument::Type</span>(<span class="ident">syn::Type::Path</span>(<span class="ident">syn::TypePath</span> { |
| <span class="ident">qself</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">param</span>.<span class="ident">ident</span>.<span class="ident">clone</span>().<span class="ident">into</span>(), |
| })) |
| } |
| <span class="ident">syn::GenericParam::Lifetime</span>(<span class="ident">param</span>) => { |
| <span class="ident">syn::GenericArgument::Lifetime</span>(<span class="ident">param</span>.<span class="ident">lifetime</span>.<span class="ident">clone</span>()) |
| } |
| <span class="ident">syn::GenericParam::Const</span>(<span class="kw">_</span>) => { |
| <span class="macro">panic!</span>(<span class="string">"Serde does not support const generics yet"</span>); |
| } |
| }) |
| .<span class="ident">collect</span>(), |
| <span class="ident">gt_token</span>: <span class="op"><</span><span class="macro">Token!</span>[<span class="op">></span>]<span class="op">></span><span class="ident">::default</span>(), |
| }, |
| ), |
| }] |
| .<span class="ident">into_iter</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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