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</pre><pre class="rust ">
<span class="doccomment">//! This crate provides helper types for matching against enum variants, and</span>
<span class="doccomment">//! extracting bindings to each of the fields in the deriving Struct or Enum in</span>
<span class="doccomment">//! a generic way.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If you are writing a `#[derive]` which needs to perform some operation on</span>
<span class="doccomment">//! every field, then you have come to the right place!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Example: `WalkFields`</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! # #[macro_use] extern crate synstructure;</span>
<span class="doccomment">//! # #[macro_use] extern crate quote;</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Trait</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! pub trait WalkFields: std::any::Any {</span>
<span class="doccomment">//! fn walk_fields(&self, walk: &mut FnMut(&WalkFields));</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! impl WalkFields for i32 {</span>
<span class="doccomment">//! fn walk_fields(&self, walk: &mut FnMut(&WalkFields)) {}</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Derive Implementation</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! fn walkfields_derive(s: synstructure::Structure) -> quote::Tokens {</span>
<span class="doccomment">//! let body = s.each(|bi| quote!{</span>
<span class="doccomment">//! walk(#bi)</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! s.bound_impl("::WalkFields", quote!{</span>
<span class="doccomment">//! fn walk_fields(&self, walk: &mut FnMut(&::WalkFields)) {</span>
<span class="doccomment">//! match *self { #body }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! })</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # const _IGNORE: &'static str = stringify!(</span>
<span class="doccomment">//! decl_derive!([WalkFields] => walkfields_derive);</span>
<span class="doccomment">//! # );</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Test Case</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! test_derive! {</span>
<span class="doccomment">//! walkfields_derive {</span>
<span class="doccomment">//! enum A<T> {</span>
<span class="doccomment">//! B(i32, T),</span>
<span class="doccomment">//! C(i32),</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! expands to {</span>
<span class="doccomment">//! impl<T> ::WalkFields for A<T> where T: ::WalkFields {</span>
<span class="doccomment">//! fn walk_fields(&self, walk: &mut FnMut(&::WalkFields)) {</span>
<span class="doccomment">//! match *self {</span>
<span class="doccomment">//! A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">//! { walk(__binding_0) }</span>
<span class="doccomment">//! { walk(__binding_1) }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! A::C(ref __binding_0,) => {</span>
<span class="doccomment">//! { walk(__binding_0) }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Example: `Interest`</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! # #[macro_use] extern crate synstructure;</span>
<span class="doccomment">//! # #[macro_use] extern crate quote;</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Trait</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! pub trait Interest {</span>
<span class="doccomment">//! fn interesting(&self) -> bool;</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! impl Interest for i32 {</span>
<span class="doccomment">//! fn interesting(&self) -> bool { *self > 0 }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Derive Implementation</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! fn interest_derive(mut s: synstructure::Structure) -> quote::Tokens {</span>
<span class="doccomment">//! let body = s.fold(false, |acc, bi| quote!{</span>
<span class="doccomment">//! #acc || ::Interest::interesting(#bi)</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! s.bound_impl("::Interest", quote!{</span>
<span class="doccomment">//! fn interesting(&self) -> bool {</span>
<span class="doccomment">//! match *self {</span>
<span class="doccomment">//! #body</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! })</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # const _IGNORE: &'static str = stringify!(</span>
<span class="doccomment">//! decl_derive!([Interest] => interest_derive);</span>
<span class="doccomment">//! # );</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! /*</span>
<span class="doccomment">//! * Test Case</span>
<span class="doccomment">//! */</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! test_derive!{</span>
<span class="doccomment">//! interest_derive {</span>
<span class="doccomment">//! enum A<T> {</span>
<span class="doccomment">//! B(i32, T),</span>
<span class="doccomment">//! C(i32),</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! expands to {</span>
<span class="doccomment">//! impl<T> ::Interest for A<T> where T: ::Interest {</span>
<span class="doccomment">//! fn interesting(&self) -> bool {</span>
<span class="doccomment">//! match *self {</span>
<span class="doccomment">//! A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">//! false || ::Interest::interesting(__binding_0) ||</span>
<span class="doccomment">//! ::Interest::interesting(__binding_1)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! A::C(ref __binding_0,) => {</span>
<span class="doccomment">//! false || ::Interest::interesting(__binding_0)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For more example usage, consider investigating the `abomonation_derive` crate,</span>
<span class="doccomment">//! which makes use of this crate, and is fairly simple.</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quote</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Attribute</span>, <span class="ident">Body</span>, <span class="ident">ConstExpr</span>, <span class="ident">DeriveInput</span>, <span class="ident">Field</span>, <span class="ident">Generics</span>, <span class="ident">Ident</span>, <span class="ident">Ty</span>, <span class="ident">TyParamBound</span>,
<span class="ident">VariantData</span>, <span class="ident">WhereBoundPredicate</span>, <span class="ident">WherePredicate</span>};
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">visit</span>::{<span class="self">self</span>, <span class="ident">Visitor</span>};
<span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">ToTokens</span>, <span class="ident">Tokens</span>};
<span class="comment">// NOTE: This module has documentation hidden, as it only exports macros (which</span>
<span class="comment">// always appear in the root of the crate) and helper methods / re-exports used</span>
<span class="comment">// in the implementation of those macros.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">macros</span>;
<span class="doccomment">/// The type of binding to use when generating a pattern.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">BindStyle</span> {
<span class="doccomment">/// `x`</span>
<span class="ident">Move</span>,
<span class="doccomment">/// `mut x`</span>
<span class="ident">MoveMut</span>,
<span class="doccomment">/// `ref x`</span>
<span class="ident">Ref</span>,
<span class="doccomment">/// `ref mut x`</span>
<span class="ident">RefMut</span>,
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">BindStyle</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">BindStyle</span>::<span class="ident">Move</span> <span class="op">=></span> {}
<span class="ident">BindStyle</span>::<span class="ident">MoveMut</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"mut"</span>),
<span class="ident">BindStyle</span>::<span class="ident">Ref</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"ref"</span>),
<span class="ident">BindStyle</span>::<span class="ident">RefMut</span> <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"ref"</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"mut"</span>);
}
}
}
}
<span class="comment">// Internal method for merging seen_generics arrays together.</span>
<span class="kw">fn</span> <span class="ident">generics_fuse</span>(<span class="ident">res</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>, <span class="ident">new</span>: <span class="kw-2">&</span>[<span class="ident">bool</span>]) {
<span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span><span class="ident">flag</span>) <span class="kw">in</span> <span class="ident">new</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">res</span>.<span class="ident">len</span>() {
<span class="ident">res</span>.<span class="ident">push</span>(<span class="bool-val">false</span>);
}
<span class="kw">if</span> <span class="ident">flag</span> {
<span class="ident">res</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="bool-val">true</span>;
}
}
}
<span class="comment">// Internal method for extracting the set of generics which have been matched</span>
<span class="kw">fn</span> <span class="ident">fetch_generics</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">set</span>: <span class="kw-2">&</span>[<span class="ident">bool</span>], <span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Generics</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tys</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
<span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span><span class="ident">seen</span>) <span class="kw">in</span> <span class="ident">set</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">seen</span> {
<span class="ident">tys</span>.<span class="ident">push</span>(<span class="kw-2">&</span><span class="ident">generics</span>.<span class="ident">ty_params</span>[<span class="ident">i</span>].<span class="ident">ident</span>);
}
}
<span class="ident">tys</span>
}
<span class="doccomment">/// Information about a specific binding. This contains both an `Ident`</span>
<span class="doccomment">/// reference to the given field, and the syn `&'a Field` descriptor for that</span>
<span class="doccomment">/// field.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type supports `quote::ToTokens`, so can be directly used within the</span>
<span class="doccomment">/// `quote!` macro. It expands to a reference to the matched field.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// The name which this BindingInfo will bind to.</span>
<span class="kw">pub</span> <span class="ident">binding</span>: <span class="ident">Ident</span>,
<span class="doccomment">/// The type of binding which this BindingInfo will create.</span>
<span class="kw">pub</span> <span class="ident">style</span>: <span class="ident">BindStyle</span>,
<span class="ident">field</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Field</span>,
<span class="comment">// These are used to determine which type parameters are avaliable.</span>
<span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Generics</span>,
<span class="ident">seen_generics</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="self">self</span>.<span class="ident">binding</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Returns a reference to the underlying `syn` AST node which this</span>
<span class="doccomment">/// `BindingInfo` references</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ast</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Field</span> {
<span class="self">self</span>.<span class="ident">field</span>
}
<span class="doccomment">/// Generates the pattern fragment for this field binding.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B{ a: i32, b: i32 },</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].bindings()[0].pat(),</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// ref __binding_0</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pat</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">BindingInfo</span> {
<span class="kw-2">ref</span> <span class="ident">binding</span>,
<span class="kw-2">ref</span> <span class="ident">style</span>,
..
} <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>;
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">style</span> #<span class="ident">binding</span>)
}
<span class="doccomment">/// Returns a list of the type parameters which are referenced in this</span>
<span class="doccomment">/// field's type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Caveat</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the field contains any macros in type position, all parameters will</span>
<span class="doccomment">/// be considered bound. This is because we cannot determine which type</span>
<span class="doccomment">/// parameters are bound by type macros.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// struct A<T, U> {</span>
<span class="doccomment">/// a: Option<T>,</span>
<span class="doccomment">/// b: U,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].bindings()[0].referenced_ty_params(),</span>
<span class="doccomment">/// &[&(syn::Ident::from("T"))]</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">referenced_ty_params</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span> {
<span class="ident">fetch_generics</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">seen_generics</span>, <span class="self">self</span>.<span class="ident">generics</span>)
}
}
<span class="doccomment">/// This type is similar to `syn`'s `Variant` type, however each of the fields</span>
<span class="doccomment">/// are references rather than owned. When this is used as the AST for a real</span>
<span class="doccomment">/// variant, this struct simply borrows the fields of the `syn` `Variant`,</span>
<span class="doccomment">/// however this type may also be used as the sole variant for astruct.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">VariantAst</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span>,
<span class="kw">pub</span> <span class="ident">attrs</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">Attribute</span>],
<span class="kw">pub</span> <span class="ident">data</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">VariantData</span>,
<span class="kw">pub</span> <span class="ident">discriminant</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>,
}
<span class="doccomment">/// A wrapper around a `syn` `DeriveInput`'s variant which provides utilities</span>
<span class="doccomment">/// for destructuring `Variant`s with `match` expressions.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">VariantInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">pub</span> <span class="ident">prefix</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span>,
<span class="ident">bindings</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">>></span>,
<span class="ident">omitted_fields</span>: <span class="ident">bool</span>,
<span class="ident">ast</span>: <span class="ident">VariantAst</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
<span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Generics</span>,
}
<span class="doccomment">/// Helper function used by the VariantInfo constructor. Walks all of the types</span>
<span class="doccomment">/// in `field` and returns a list of the type parameters from `ty_params` which</span>
<span class="doccomment">/// are referenced in the field.</span>
<span class="kw">fn</span> <span class="ident">get_ty_params</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">field</span>: <span class="kw-2">&</span><span class="ident">Field</span>, <span class="ident">generics</span>: <span class="kw-2">&</span><span class="ident">Generics</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> {
<span class="comment">// Helper type. Discovers all identifiers inside of the visited type,</span>
<span class="comment">// and calls a callback with them.</span>
<span class="kw">struct</span> <span class="ident">BoundTypeLocator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">result</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>,
<span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Generics</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Visitor</span> <span class="kw">for</span> <span class="ident">BoundTypeLocator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="comment">// XXX: This also (intentionally) captures paths like T::SomeType. Is</span>
<span class="comment">// this desirable?</span>
<span class="kw">fn</span> <span class="ident">visit_ident</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="kw-2">&</span><span class="ident">Ident</span>) {
<span class="kw">for</span> (<span class="ident">idx</span>, <span class="ident">i</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">generics</span>.<span class="ident">ty_params</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">if</span> <span class="ident">i</span>.<span class="ident">ident</span> <span class="op">==</span> <span class="ident">id</span> {
<span class="self">self</span>.<span class="ident">result</span>[<span class="ident">idx</span>] <span class="op">=</span> <span class="bool-val">true</span>;
}
}
}
<span class="kw">fn</span> <span class="ident">visit_ty</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">Ty</span>) {
<span class="comment">// If we see a type macro, we can't know what type parameters it</span>
<span class="comment">// might be binding, so we presume that it binds all of them.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Ty</span>::<span class="ident">Mac</span>(_) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">ty</span> {
<span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">result</span> {
<span class="kw-2">*</span><span class="ident">r</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
}
<span class="ident">visit</span>::<span class="ident">walk_ty</span>(<span class="self">self</span>, <span class="ident">ty</span>);
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">btl</span> <span class="op">=</span> <span class="ident">BoundTypeLocator</span> {
<span class="ident">result</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="bool-val">false</span>; <span class="ident">generics</span>.<span class="ident">ty_params</span>.<span class="ident">len</span>()],
<span class="ident">generics</span>: <span class="ident">generics</span>,
};
<span class="ident">btl</span>.<span class="ident">visit_ty</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>);
<span class="ident">btl</span>.<span class="ident">result</span>
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">VariantInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ast</span>: <span class="ident">VariantAst</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">prefix</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span>, <span class="ident">generics</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Generics</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">bindings</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">ast</span>.<span class="ident">data</span> {
<span class="ident">VariantData</span>::<span class="ident">Unit</span> <span class="op">=></span> <span class="macro">vec</span><span class="macro">!</span>[],
<span class="ident">VariantData</span>::<span class="ident">Tuple</span>(<span class="kw-2">ref</span> <span class="ident">fields</span>) <span class="op">|</span> <span class="ident">VariantData</span>::<span class="ident">Struct</span>(<span class="kw-2">ref</span> <span class="ident">fields</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">BindingInfo</span> {
<span class="ident">binding</span>: <span class="macro">format</span><span class="macro">!</span>(<span class="string">"__binding_{}"</span>, <span class="ident">i</span>).<span class="ident">into</span>(),
<span class="ident">style</span>: <span class="ident">BindStyle</span>::<span class="ident">Ref</span>,
<span class="ident">field</span>: <span class="ident">field</span>,
<span class="ident">generics</span>: <span class="ident">generics</span>,
<span class="ident">seen_generics</span>: <span class="ident">get_ty_params</span>(<span class="ident">field</span>, <span class="ident">generics</span>),
}
})
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></span>(),
};
<span class="ident">VariantInfo</span> {
<span class="ident">prefix</span>: <span class="ident">prefix</span>,
<span class="ident">bindings</span>: <span class="ident">bindings</span>,
<span class="ident">omitted_fields</span>: <span class="bool-val">false</span>,
<span class="ident">ast</span>: <span class="ident">ast</span>,
<span class="ident">generics</span>: <span class="ident">generics</span>,
}
}
<span class="doccomment">/// Returns a slice of the bindings in this Variant.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bindings</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>] {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bindings</span>
}
<span class="doccomment">/// Returns a mut slice of the bindings in this Variant.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bindings_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">BindingInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>] {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">bindings</span>
}
<span class="doccomment">/// Returns a `VariantAst` object which contains references to the</span>
<span class="doccomment">/// underlying `syn` AST node which this `Variant` was created from.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ast</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">VariantAst</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">ast</span>
}
<span class="doccomment">/// True if any bindings were omitted due to a `filter` call.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">omitted_bindings</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">omitted_fields</span>
}
<span class="doccomment">/// Generates the match-arm pattern which could be used to match against this Variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].pat(),</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pat</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">prefix</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">prefix</span> {
<span class="ident">prefix</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"::"</span>);
}
<span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">data</span> {
<span class="ident">VariantData</span>::<span class="ident">Unit</span> <span class="op">=></span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span>);
}
<span class="ident">VariantData</span>::<span class="ident">Tuple</span>(..) <span class="op">=></span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"("</span>);
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bindings</span> {
<span class="ident">binding</span>.<span class="ident">pat</span>().<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">","</span>);
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">omitted_fields</span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">".."</span>);
}
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">")"</span>);
}
<span class="ident">VariantData</span>::<span class="ident">Struct</span>(..) <span class="op">=></span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"{"</span>);
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bindings</span> {
<span class="ident">binding</span>.<span class="ident">field</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">":"</span>);
<span class="ident">binding</span>.<span class="ident">pat</span>().<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">","</span>);
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">omitted_fields</span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">".."</span>);
}
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"}"</span>);
}
}
<span class="ident">t</span>
}
<span class="doccomment">/// Generates the token stream required to construct the current variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The init array initializes each of the fields in the order they are written in `variant.ast().fields`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(usize, usize),</span>
<span class="doccomment">/// C{ v: usize },</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].construct(|_, i| quote!(#i)),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(0usize, 1usize,)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[1].construct(|_, i| quote!(#i)),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::C{ v: 0usize, }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">construct</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">func</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">Field</span>, <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span>,
<span class="ident">T</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">prefix</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">prefix</span> {
<span class="ident">prefix</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"::"</span>);
}
<span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">data</span> {
<span class="ident">VariantData</span>::<span class="ident">Unit</span> <span class="op">=></span> (),
<span class="ident">VariantData</span>::<span class="ident">Tuple</span>(<span class="kw-2">ref</span> <span class="ident">fields</span>) <span class="op">=></span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"("</span>);
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">field</span>) <span class="kw">in</span> <span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="ident">func</span>(<span class="ident">field</span>, <span class="ident">i</span>).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">","</span>);
}
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">")"</span>);
}
<span class="ident">VariantData</span>::<span class="ident">Struct</span>(<span class="kw-2">ref</span> <span class="ident">fields</span>) <span class="op">=></span> {
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"{"</span>);
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">field</span>) <span class="kw">in</span> <span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="ident">field</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">":"</span>);
<span class="ident">func</span>(<span class="ident">field</span>, <span class="ident">i</span>).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">","</span>);
}
<span class="ident">t</span>.<span class="ident">append</span>(<span class="string">"}"</span>);
}
}
<span class="ident">t</span>
}
<span class="doccomment">/// Runs the passed-in function once for each bound field, passing in a `BindingInfo`.</span>
<span class="doccomment">/// and generating a `match` arm which evaluates the returned tokens.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ignore fields which are ignored through the `filter`</span>
<span class="doccomment">/// method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// { println!("{:?}", __binding_1) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">each</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">R</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="ident">pat</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pat</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bindings</span> {
<span class="ident">body</span>.<span class="ident">append</span>(<span class="string">"{"</span>);
<span class="ident">f</span>(<span class="ident">binding</span>).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">body</span>);
<span class="ident">body</span>.<span class="ident">append</span>(<span class="string">"}"</span>);
}
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">pat</span> <span class="op">=></span> { #<span class="ident">body</span> })
}
<span class="doccomment">/// Runs the passed-in function once for each bound field, passing in the</span>
<span class="doccomment">/// result of the previous call, and a `BindingInfo`. generating a `match`</span>
<span class="doccomment">/// arm which evaluates to the resulting tokens.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ignore fields which are ignored through the `filter`</span>
<span class="doccomment">/// method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].fold(quote!(0), |acc, bi| quote!(#acc + #bi)),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">/// 0 + __binding_0 + __binding_1</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fold</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">I</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">init</span>: <span class="ident">I</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">Tokens</span>, <span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">I</span>: <span class="ident">ToTokens</span>,
<span class="ident">R</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="ident">pat</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pat</span>();
<span class="kw">let</span> <span class="ident">body</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">init</span>), <span class="op">|</span><span class="ident">i</span>, <span class="ident">bi</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">i</span>, <span class="ident">bi</span>);
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">r</span>)
});
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">pat</span> <span class="op">=></span> { #<span class="ident">body</span> })
}
<span class="doccomment">/// Filter the bindings created by this `Variant` object. This has 2 effects:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The bindings will no longer appear in match arms generated by methods</span>
<span class="doccomment">/// on this `Variant` or its subobjects.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Impl blocks created with the `bound_impl` or `unsafe_bound_impl`</span>
<span class="doccomment">/// method only consider type parameters referenced in the types of</span>
<span class="doccomment">/// non-filtered fields.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B{ a: i32, b: i32 },</span>
<span class="doccomment">/// C{ a: u32 },</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.variants_mut()[0].filter(|bi| {</span>
<span class="doccomment">/// bi.ast().ident == Some("b".into())</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B{ b: ref __binding_1, .. } => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_1) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C{ a: ref __binding_0, } => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="kw">let</span> <span class="ident">before_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">len</span>();
<span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">retain</span>(<span class="ident">f</span>);
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">before_len</span> {
<span class="self">self</span>.<span class="ident">omitted_fields</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="self">self</span>
}
<span class="doccomment">/// Remove the binding at the given index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the index is out of range.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove_binding</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">remove</span>(<span class="ident">idx</span>);
<span class="self">self</span>.<span class="ident">omitted_fields</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Updates the `BindStyle` for each of the passed-in fields by calling the</span>
<span class="doccomment">/// passed-in function for each `BindingInfo`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.variants_mut()[0].bind_with(|bi| BindStyle::RefMut);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref mut __binding_0, ref mut __binding_1,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// { println!("{:?}", __binding_1) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C(ref __binding_0,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bind_with</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">BindStyle</span>,
{
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">bindings</span> {
<span class="ident">binding</span>.<span class="ident">style</span> <span class="op">=</span> <span class="ident">f</span>(<span class="kw-2">&</span><span class="ident">binding</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Updates the binding name for each fo the passed-in fields by calling the</span>
<span class="doccomment">/// passed-in function for each `BindingInfo`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The function will be called with the `BindingInfo` and its index in the</span>
<span class="doccomment">/// enclosing variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default name is `__binding_{}` where `{}` is replaced with an</span>
<span class="doccomment">/// increasing number.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B{ a: i32, b: i32 },</span>
<span class="doccomment">/// C{ a: u32 },</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.variants_mut()[0].binding_name(|bi, i| bi.ident.clone().unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B{ a: ref a, b: ref b, } => {</span>
<span class="doccomment">/// { println!("{:?}", a) }</span>
<span class="doccomment">/// { println!("{:?}", b) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C{ a: ref __binding_0, } => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">binding_name</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">Field</span>, <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Ident</span>,
{
<span class="kw">for</span> (<span class="ident">it</span>, <span class="ident">binding</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">bindings</span>.<span class="ident">iter_mut</span>().<span class="ident">enumerate</span>() {
<span class="ident">binding</span>.<span class="ident">binding</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">binding</span>.<span class="ident">field</span>, <span class="ident">it</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Returns a list of the type parameters which are referenced in this</span>
<span class="doccomment">/// field's type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Caveat</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the field contains any macros in type position, all parameters will</span>
<span class="doccomment">/// be considered bound. This is because we cannot determine which type</span>
<span class="doccomment">/// parameters are bound by type macros.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// struct A<T, U> {</span>
<span class="doccomment">/// a: Option<T>,</span>
<span class="doccomment">/// b: U,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.variants()[0].bindings()[0].referenced_ty_params(),</span>
<span class="doccomment">/// &[&(syn::Ident::from("T"))]</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">referenced_ty_params</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">bindings</span> {
<span class="ident">generics_fuse</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">flags</span>, <span class="kw-2">&</span><span class="ident">binding</span>.<span class="ident">seen_generics</span>);
}
<span class="ident">fetch_generics</span>(<span class="kw-2">&</span><span class="ident">flags</span>, <span class="self">self</span>.<span class="ident">generics</span>)
}
}
<span class="doccomment">/// A wrapper around a `syn` `DeriveInput` which provides utilities for creating</span>
<span class="doccomment">/// custom derive trait implementations.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Structure</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">variants</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">VariantInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">>></span>,
<span class="ident">omitted_variants</span>: <span class="ident">bool</span>,
<span class="ident">ast</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">DeriveInput</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Structure</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Create a new `Structure` with the variants and fields from the passed-in</span>
<span class="doccomment">/// `DeriveInput`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ast</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">DeriveInput</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">variants</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">ast</span>.<span class="ident">body</span> {
<span class="ident">Body</span>::<span class="ident">Enum</span>(<span class="kw-2">ref</span> <span class="ident">variants</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">v</span><span class="op">|</span> {
<span class="ident">VariantInfo</span>::<span class="ident">new</span>(
<span class="ident">VariantAst</span> {
<span class="ident">ident</span>: <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">ident</span>,
<span class="ident">attrs</span>: <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">attrs</span>,
<span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">data</span>,
<span class="ident">discriminant</span>: <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">discriminant</span>,
},
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>),
<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">generics</span>,
)
})
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></span>(),
<span class="ident">Body</span>::<span class="ident">Struct</span>(<span class="kw-2">ref</span> <span class="ident">vd</span>) <span class="op">=></span> {
<span class="kw">static</span> <span class="ident">NONE_DISCRIMINANT</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="macro">vec</span><span class="macro">!</span>[
<span class="ident">VariantInfo</span>::<span class="ident">new</span>(
<span class="ident">VariantAst</span> {
<span class="ident">ident</span>: <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">ident</span>,
<span class="ident">attrs</span>: <span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">attrs</span>,
<span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">vd</span>,
<span class="ident">discriminant</span>: <span class="kw-2">&</span><span class="ident">NONE_DISCRIMINANT</span>,
},
<span class="prelude-val">None</span>,
<span class="kw-2">&</span><span class="ident">ast</span>.<span class="ident">generics</span>,
),
]
}
};
<span class="ident">Structure</span> {
<span class="ident">variants</span>: <span class="ident">variants</span>,
<span class="ident">omitted_variants</span>: <span class="bool-val">false</span>,
<span class="ident">ast</span>: <span class="ident">ast</span>,
}
}
<span class="doccomment">/// Returns a slice of the variants in this Structure.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">variants</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">VariantInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>] {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span>
}
<span class="doccomment">/// Returns a mut slice of the variants in this Structure.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">variants_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">VariantInfo</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>] {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">variants</span>
}
<span class="doccomment">/// Returns a reference to the underlying `syn` AST node which this</span>
<span class="doccomment">/// `Structure` was created from.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ast</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">DeriveInput</span> {
<span class="self">self</span>.<span class="ident">ast</span>
}
<span class="doccomment">/// True if any variants were omitted due to a `filter_variants` call.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">omitted_variants</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">omitted_variants</span>
}
<span class="doccomment">/// Runs the passed-in function once for each bound field, passing in a `BindingInfo`.</span>
<span class="doccomment">/// and generating `match` arms which evaluate the returned tokens.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ignore variants or fields which are ignored through the</span>
<span class="doccomment">/// `filter` and `filter_variant` methods.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// { println!("{:?}", __binding_1) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C(ref __binding_0,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">each</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">R</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span> {
<span class="ident">variant</span>.<span class="ident">each</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">omitted_variants</span> {
<span class="macro">quote</span><span class="macro">!</span>(_ <span class="op">=></span> {}).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="ident">t</span>
}
<span class="doccomment">/// Runs the passed-in function once for each bound field, passing in the</span>
<span class="doccomment">/// result of the previous call, and a `BindingInfo`. generating `match`</span>
<span class="doccomment">/// arms which evaluate to the resulting tokens.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ignore variants or fields which are ignored through the</span>
<span class="doccomment">/// `filter` and `filter_variant` methods.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a variant has been ignored, it will return the `init` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.fold(quote!(0), |acc, bi| quote!(#acc + #bi)),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">/// 0 + __binding_0 + __binding_1</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C(ref __binding_0,) => {</span>
<span class="doccomment">/// 0 + __binding_0</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fold</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">I</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">init</span>: <span class="ident">I</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">Tokens</span>, <span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">I</span>: <span class="ident">ToTokens</span>,
<span class="ident">R</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span> {
<span class="ident">variant</span>.<span class="ident">fold</span>(<span class="kw-2">&</span><span class="ident">init</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">omitted_variants</span> {
<span class="macro">quote</span><span class="macro">!</span>(_ <span class="op">=></span> { #<span class="ident">init</span> }).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="ident">t</span>
}
<span class="doccomment">/// Runs the passed-in function once for each variant, passing in a</span>
<span class="doccomment">/// `VariantInfo`. and generating `match` arms which evaluate the returned</span>
<span class="doccomment">/// tokens.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ignore variants and not bind fields which are ignored</span>
<span class="doccomment">/// through the `filter` and `filter_variant` methods.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each_variant(|v| {</span>
<span class="doccomment">/// let name = &v.ast().ident;</span>
<span class="doccomment">/// quote!(println!(stringify!(#name)))</span>
<span class="doccomment">/// }),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref __binding_0, ref __binding_1,) => {</span>
<span class="doccomment">/// println!(stringify!(B))</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C(ref __binding_0,) => {</span>
<span class="doccomment">/// println!(stringify!(C))</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">each_variant</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Tokens</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">VariantInfo</span>) <span class="op">-></span> <span class="ident">R</span>,
<span class="ident">R</span>: <span class="ident">ToTokens</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Tokens</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span> {
<span class="kw">let</span> <span class="ident">pat</span> <span class="op">=</span> <span class="ident">variant</span>.<span class="ident">pat</span>();
<span class="kw">let</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">variant</span>);
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">pat</span> <span class="op">=></span> { #<span class="ident">body</span> }).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">omitted_variants</span> {
<span class="macro">quote</span><span class="macro">!</span>(_ <span class="op">=></span> {}).<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">t</span>);
}
<span class="ident">t</span>
}
<span class="doccomment">/// Filter the bindings created by this `Structure` object. This has 2 effects:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The bindings will no longer appear in match arms generated by methods</span>
<span class="doccomment">/// on this `Structure` or its subobjects.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Impl blocks created with the `bound_impl` or `unsafe_bound_impl`</span>
<span class="doccomment">/// method only consider type parameters referenced in the types of</span>
<span class="doccomment">/// non-filtered fields.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B{ a: i32, b: i32 },</span>
<span class="doccomment">/// C{ a: u32 },</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.filter(|bi| { bi.ast().ident == Some("a".into()) });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B{ a: ref __binding_0, .. } => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C{ a: ref __binding_0, } => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">variants</span> {
<span class="ident">variant</span>.<span class="ident">filter</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Filter the variants matched by this `Structure` object. This has 2 effects:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Match arms destructuring these variants will no longer be generated by</span>
<span class="doccomment">/// methods on this `Structure`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Impl blocks created with the `bound_impl` or `unsafe_bound_impl`</span>
<span class="doccomment">/// method only consider type parameters referenced in the types of</span>
<span class="doccomment">/// fields in non-fitered variants.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.filter_variants(|v| v.ast().ident != "B");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::C(ref __binding_0,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// _ => {}</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter_variants</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">VariantInfo</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="kw">let</span> <span class="ident">before_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">variants</span>.<span class="ident">len</span>();
<span class="self">self</span>.<span class="ident">variants</span>.<span class="ident">retain</span>(<span class="ident">f</span>);
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">variants</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">before_len</span> {
<span class="self">self</span>.<span class="ident">omitted_variants</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="self">self</span>
}
<span class="doccomment">/// Remove the variant at the given index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the index is out of range.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove_variant</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">variants</span>.<span class="ident">remove</span>(<span class="ident">idx</span>);
<span class="self">self</span>.<span class="ident">omitted_variants</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Updates the `BindStyle` for each of the passed-in fields by calling the</span>
<span class="doccomment">/// passed-in function for each `BindingInfo`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B(i32, i32),</span>
<span class="doccomment">/// C(u32),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.bind_with(|bi| BindStyle::RefMut);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B(ref mut __binding_0, ref mut __binding_1,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// { println!("{:?}", __binding_1) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C(ref mut __binding_0,) => {</span>
<span class="doccomment">/// { println!("{:?}", __binding_0) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bind_with</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">BindStyle</span>,
{
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">variants</span> {
<span class="ident">variant</span>.<span class="ident">bind_with</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Updates the binding name for each fo the passed-in fields by calling the</span>
<span class="doccomment">/// passed-in function for each `BindingInfo`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The function will be called with the `BindingInfo` and its index in the</span>
<span class="doccomment">/// enclosing variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default name is `__binding_{}` where `{}` is replaced with an</span>
<span class="doccomment">/// increasing number.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A {</span>
<span class="doccomment">/// B{ a: i32, b: i32 },</span>
<span class="doccomment">/// C{ a: u32 },</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.binding_name(|bi, i| bi.ident.clone().unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.each(|bi| quote!(println!("{:?}", #bi))),</span>
<span class="doccomment">///</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// A::B{ a: ref a, b: ref b, } => {</span>
<span class="doccomment">/// { println!("{:?}", a) }</span>
<span class="doccomment">/// { println!("{:?}", b) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// A::C{ a: ref a, } => {</span>
<span class="doccomment">/// { println!("{:?}", a) }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">binding_name</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">Field</span>, <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Ident</span>,
{
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">variants</span> {
<span class="ident">variant</span>.<span class="ident">binding_name</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Returns a list of the type parameters which are refrenced in the types</span>
<span class="doccomment">/// of non-filtered fields / variants.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Caveat</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the struct contains any macros in type position, all parameters will</span>
<span class="doccomment">/// be considered bound. This is because we cannot determine which type</span>
<span class="doccomment">/// parameters are bound by type macros.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A<T, U> {</span>
<span class="doccomment">/// B(T, i32),</span>
<span class="doccomment">/// C(Option<U>),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.filter_variants(|v| v.ast().ident != "C");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.referenced_ty_params(),</span>
<span class="doccomment">/// &[&(syn::Ident::from("T"))]</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">referenced_ty_params</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Ident</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span> {
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">bindings</span> {
<span class="ident">generics_fuse</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">flags</span>, <span class="kw-2">&</span><span class="ident">binding</span>.<span class="ident">seen_generics</span>);
}
}
<span class="ident">fetch_generics</span>(<span class="kw-2">&</span><span class="ident">flags</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">generics</span>)
}
<span class="doccomment">/// Add trait bounds for a trait with the given path for each type parmaeter</span>
<span class="doccomment">/// referenced in the types of non-filtered fields.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Caveat</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the method contains any macros in type position, all parameters will</span>
<span class="doccomment">/// be considered bound. This is because we cannot determine which type</span>
<span class="doccomment">/// parameters are bound by type macros.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_trait_bounds</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">bound</span>: <span class="kw-2">&</span><span class="ident">TyParamBound</span>, <span class="ident">preds</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">WherePredicate</span><span class="op">></span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seen</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pred</span> <span class="op">=</span> <span class="op">|</span><span class="ident">ty</span>: <span class="ident">Ty</span><span class="op">|</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">seen</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">ty</span>) {
<span class="ident">seen</span>.<span class="ident">insert</span>(<span class="ident">ty</span>.<span class="ident">clone</span>());
<span class="ident">preds</span>.<span class="ident">push</span>(<span class="ident">WherePredicate</span>::<span class="ident">BoundPredicate</span>(<span class="ident">WhereBoundPredicate</span> {
<span class="ident">bound_lifetimes</span>: <span class="macro">vec</span><span class="macro">!</span>[],
<span class="ident">bounded_ty</span>: <span class="ident">ty</span>,
<span class="ident">bounds</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">bound</span>.<span class="ident">clone</span>()],
}))
};
<span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">variants</span> {
<span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">bindings</span> {
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">seen</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">binding</span>.<span class="ident">seen_generics</span> {
<span class="kw">if</span> <span class="ident">seen</span> {
<span class="ident">pred</span>(<span class="ident">binding</span>.<span class="ident">ast</span>().<span class="ident">ty</span>.<span class="ident">clone</span>());
<span class="kw">break</span>;
}
}
<span class="kw">for</span> <span class="ident">param</span> <span class="kw">in</span> <span class="ident">binding</span>.<span class="ident">referenced_ty_params</span>() {
<span class="ident">pred</span>(<span class="ident">Ty</span>::<span class="ident">Path</span>(<span class="prelude-val">None</span>, (<span class="kw-2">*</span><span class="ident">param</span>).<span class="ident">clone</span>().<span class="ident">into</span>()));
}
}
}
}
<span class="doccomment">/// Creates an `impl` block with the required generic type fields filled in</span>
<span class="doccomment">/// to implement the trait `path`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method also adds where clauses to the impl requiring that all</span>
<span class="doccomment">/// referenced type parmaeters implement the trait `path`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Caveat</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the method contains any macros in type position, all parameters will</span>
<span class="doccomment">/// be considered bound. This is because we cannot determine which type</span>
<span class="doccomment">/// parameters are bound by type macros.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the path string parameter is not a valid TyParamBound.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate quote;</span>
<span class="doccomment">/// # extern crate synstructure;</span>
<span class="doccomment">/// # extern crate syn;</span>
<span class="doccomment">/// # use synstructure::*;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let di = syn::parse_derive_input(r#"</span>
<span class="doccomment">/// enum A<T, U> {</span>
<span class="doccomment">/// B(T),</span>
<span class="doccomment">/// C(Option<U>),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// "#).unwrap();</span>
<span class="doccomment">/// let mut s = Structure::new(&di);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.filter_variants(|v| v.ast().ident != "B");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.bound_impl("::krate::Trait", quote!{</span>
<span class="doccomment">/// fn a() {}</span>
<span class="doccomment">/// }),</span>
<span class="doccomment">/// quote!{</span>
<span class="doccomment">/// impl<T, U> ::krate::Trait for A<T, U></span>
<span class="doccomment">/// where Option<U>: ::krate::Trait,</span>
<span class="doccomment">/// U: ::krate::Trait</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// fn a() {}</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bound_impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">B</span>: <span class="ident">ToTokens</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">bound</span>: <span class="ident">P</span>, <span class="ident">body</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> (<span class="ident">impl_generics</span>, <span class="ident">ty_generics</span>, <span class="ident">where_clause</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>();
<span class="kw">let</span> <span class="ident">bound</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_ty_param_bound</span>(<span class="ident">bound</span>.<span class="ident">as_ref</span>())
.<span class="ident">expect</span>(<span class="string">"`bound` argument must be a valid rust trait bound"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">where_clause</span> <span class="op">=</span> <span class="ident">where_clause</span>.<span class="ident">clone</span>();
<span class="self">self</span>.<span class="ident">add_trait_bounds</span>(<span class="kw-2">&</span><span class="ident">bound</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">where_clause</span>.<span class="ident">predicates</span>);
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> #<span class="ident">impl_generics</span> #<span class="ident">bound</span> <span class="kw">for</span> #<span class="ident">name</span> #<span class="ident">ty_generics</span> #<span class="ident">where_clause</span> {
#<span class="ident">body</span>
}
}
}
<span class="doccomment">/// This method is the same as `bound_impl`, except also includes the</span>
<span class="doccomment">/// `unsafe` keyword for implementing unsafe traits.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsafe_bound_impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">B</span>: <span class="ident">ToTokens</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">path</span>: <span class="ident">P</span>, <span class="ident">body</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">safe</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bound_impl</span>(<span class="ident">path</span>, <span class="ident">body</span>);
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">unsafe</span> #<span class="ident">safe</span>)
}
<span class="doccomment">/// This method is like `bound_impl` but doesn't add the additional bounds</span>
<span class="doccomment">/// to the where clause.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unbound_impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">B</span>: <span class="ident">ToTokens</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">bound</span>: <span class="ident">P</span>, <span class="ident">body</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">ident</span>;
<span class="kw">let</span> (<span class="ident">impl_generics</span>, <span class="ident">ty_generics</span>, <span class="ident">where_clause</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">ast</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>();
<span class="kw">let</span> <span class="ident">bound</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_ty_param_bound</span>(<span class="ident">bound</span>.<span class="ident">as_ref</span>())
.<span class="ident">expect</span>(<span class="string">"`bound` argument must be a valid rust trait bound"</span>);
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">impl</span> #<span class="ident">impl_generics</span> #<span class="ident">bound</span> <span class="kw">for</span> #<span class="ident">name</span> #<span class="ident">ty_generics</span> #<span class="ident">where_clause</span> {
#<span class="ident">body</span>
}
}
}
<span class="doccomment">/// This method is the same as `unbound_impl`, except also includes the</span>
<span class="doccomment">/// `unsafe` keyword for implementing unsafe traits.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsafe_unbound_impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>, <span class="ident">B</span>: <span class="ident">ToTokens</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">path</span>: <span class="ident">P</span>, <span class="ident">body</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">safe</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">unbound_impl</span>(<span class="ident">path</span>, <span class="ident">body</span>);
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">unsafe</span> #<span class="ident">safe</span>)
}
}
</pre>
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