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| <span id="787">787</span> |
| <span id="788">788</span> |
| <span id="789">789</span> |
| <span id="790">790</span> |
| <span id="791">791</span> |
| <span id="792">792</span> |
| <span id="793">793</span> |
| <span id="794">794</span> |
| <span id="795">795</span> |
| <span id="796">796</span> |
| <span id="797">797</span> |
| <span id="798">798</span> |
| <span id="799">799</span> |
| <span id="800">800</span> |
| <span id="801">801</span> |
| <span id="802">802</span> |
| <span id="803">803</span> |
| <span id="804">804</span> |
| <span id="805">805</span> |
| <span id="806">806</span> |
| <span id="807">807</span> |
| <span id="808">808</span> |
| <span id="809">809</span> |
| <span id="810">810</span> |
| <span id="811">811</span> |
| <span id="812">812</span> |
| <span id="813">813</span> |
| <span id="814">814</span> |
| <span id="815">815</span> |
| <span id="816">816</span> |
| <span id="817">817</span> |
| <span id="818">818</span> |
| <span id="819">819</span> |
| <span id="820">820</span> |
| <span id="821">821</span> |
| <span id="822">822</span> |
| <span id="823">823</span> |
| <span id="824">824</span> |
| <span id="825">825</span> |
| <span id="826">826</span> |
| <span id="827">827</span> |
| <span id="828">828</span> |
| <span id="829">829</span> |
| <span id="830">830</span> |
| <span id="831">831</span> |
| <span id="832">832</span> |
| <span id="833">833</span> |
| <span id="834">834</span> |
| <span id="835">835</span> |
| <span id="836">836</span> |
| <span id="837">837</span> |
| <span id="838">838</span> |
| <span id="839">839</span> |
| <span id="840">840</span> |
| <span id="841">841</span> |
| <span id="842">842</span> |
| </pre><pre class="rust"><code><span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::punctuated::Punctuated</span>; |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A path at which a named item is exported (e.g. `std::collections::HashMap`).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Path</span> { |
| <span class="kw">pub</span> <span class="ident">leading_colon</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro">Token!</span>[::]<span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">segments</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">PathSegment</span>, <span class="macro">Token!</span>[::]<span class="op">></span>, |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Path</span> |
| <span class="kw">where</span> |
| <span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">PathSegment</span><span class="op">></span>, |
| { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">segment</span>: <span class="ident">T</span>) -> <span class="self">Self</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span> { |
| <span class="ident">leading_colon</span>: <span class="prelude-val">None</span>, |
| <span class="ident">segments</span>: <span class="ident">Punctuated::new</span>(), |
| }; |
| <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">segment</span>.<span class="ident">into</span>()); |
| <span class="ident">path</span> |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A segment of a path together with any path arguments on that segment.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PathSegment</span> { |
| <span class="kw">pub</span> <span class="ident">ident</span>: <span class="ident">Ident</span>, |
| <span class="kw">pub</span> <span class="ident">arguments</span>: <span class="ident">PathArguments</span>, |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PathSegment</span> |
| <span class="kw">where</span> |
| <span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">Ident</span><span class="op">></span>, |
| { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">ident</span>: <span class="ident">T</span>) -> <span class="self">Self</span> { |
| <span class="ident">PathSegment</span> { |
| <span class="ident">ident</span>: <span class="ident">ident</span>.<span class="ident">into</span>(), |
| <span class="ident">arguments</span>: <span class="ident">PathArguments::None</span>, |
| } |
| } |
| } |
| |
| <span class="macro">ast_enum!</span> { |
| <span class="doccomment">/// Angle bracketed or parenthesized arguments of a path segment.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ## Angle bracketed</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The `<'a, T>` in `std::slice::iter<'a, T>`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ## Parenthesized</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The `(A, B) -> C` in `Fn(A, B) -> C`.</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">PathArguments</span> { |
| <span class="prelude-val">None</span>, |
| <span class="doccomment">/// The `<'a, T>` in `std::slice::iter<'a, T>`.</span> |
| <span class="ident">AngleBracketed</span>(<span class="ident">AngleBracketedGenericArguments</span>), |
| <span class="doccomment">/// The `(A, B) -> C` in `Fn(A, B) -> C`.</span> |
| <span class="ident">Parenthesized</span>(<span class="ident">ParenthesizedGenericArguments</span>), |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">PathArguments</span> { |
| <span class="kw">fn</span> <span class="ident">default</span>() -> <span class="self">Self</span> { |
| <span class="ident">PathArguments::None</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PathArguments</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">PathArguments::None</span> => <span class="bool-val">true</span>, |
| <span class="ident">PathArguments::AngleBracketed</span>(<span class="ident">bracketed</span>) => <span class="ident">bracketed</span>.<span class="ident">args</span>.<span class="ident">is_empty</span>(), |
| <span class="ident">PathArguments::Parenthesized</span>(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">is_none</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">PathArguments::None</span> => <span class="bool-val">true</span>, |
| <span class="ident">PathArguments::AngleBracketed</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">PathArguments::Parenthesized</span>(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="macro">ast_enum!</span> { |
| <span class="doccomment">/// An individual generic argument, like `'a`, `T`, or `Item = T`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">GenericArgument</span> { |
| <span class="doccomment">/// A lifetime argument.</span> |
| <span class="ident">Lifetime</span>(<span class="ident">Lifetime</span>), |
| <span class="doccomment">/// A type argument.</span> |
| <span class="ident">Type</span>(<span class="ident">Type</span>), |
| <span class="doccomment">/// A binding (equality constraint) on an associated type: the `Item =</span> |
| <span class="doccomment">/// u8` in `Iterator<Item = u8>`.</span> |
| <span class="ident">Binding</span>(<span class="ident">Binding</span>), |
| <span class="doccomment">/// An associated type bound: `Iterator<Item: Display>`.</span> |
| <span class="ident">Constraint</span>(<span class="ident">Constraint</span>), |
| <span class="doccomment">/// A const expression. Must be inside of a block.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// NOTE: Identity expressions are represented as Type arguments, as</span> |
| <span class="doccomment">/// they are indistinguishable syntactically.</span> |
| <span class="ident">Const</span>(<span class="ident">Expr</span>), |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// Angle bracketed arguments of a path segment: the `<K, V>` in `HashMap<K,</span> |
| <span class="doccomment">/// V>`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AngleBracketedGenericArguments</span> { |
| <span class="kw">pub</span> <span class="ident">colon2_token</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro">Token!</span>[::]<span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">lt_token</span>: <span class="macro">Token!</span>[<span class="op"><</span>], |
| <span class="kw">pub</span> <span class="ident">args</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">GenericArgument</span>, <span class="macro">Token!</span>[,]<span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">gt_token</span>: <span class="macro">Token!</span>[<span class="op">></span>], |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// A binding (equality constraint) on an associated type: `Item = u8`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Binding</span> { |
| <span class="kw">pub</span> <span class="ident">ident</span>: <span class="ident">Ident</span>, |
| <span class="kw">pub</span> <span class="ident">eq_token</span>: <span class="macro">Token!</span>[<span class="op">=</span>], |
| <span class="kw">pub</span> <span class="ident">ty</span>: <span class="ident">Type</span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// An associated type bound: `Iterator<Item: Display>`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Constraint</span> { |
| <span class="kw">pub</span> <span class="ident">ident</span>: <span class="ident">Ident</span>, |
| <span class="kw">pub</span> <span class="ident">colon_token</span>: <span class="macro">Token!</span>[:], |
| <span class="kw">pub</span> <span class="ident">bounds</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">TypeParamBound</span>, <span class="macro">Token!</span>[<span class="op">+</span>]<span class="op">></span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// Arguments of a function path segment: the `(A, B) -> C` in `Fn(A,B) -></span> |
| <span class="doccomment">/// C`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ParenthesizedGenericArguments</span> { |
| <span class="kw">pub</span> <span class="ident">paren_token</span>: <span class="ident">token::Paren</span>, |
| <span class="doccomment">/// `(A, B)`</span> |
| <span class="kw">pub</span> <span class="ident">inputs</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">Type</span>, <span class="macro">Token!</span>[,]<span class="op">></span>, |
| <span class="doccomment">/// `C`</span> |
| <span class="kw">pub</span> <span class="ident">output</span>: <span class="ident">ReturnType</span>, |
| } |
| } |
| |
| <span class="macro">ast_struct!</span> { |
| <span class="doccomment">/// The explicit Self type in a qualified path: the `T` in `<T as</span> |
| <span class="doccomment">/// Display>::fmt`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The actual path, including the trait and the associated item, is stored</span> |
| <span class="doccomment">/// separately. The `position` field represents the index of the associated</span> |
| <span class="doccomment">/// item qualified with this Self type.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// <Vec<T> as a::b::Trait>::AssociatedItem</span> |
| <span class="doccomment">/// ^~~~~~ ~~~~~~~~~~~~~~^</span> |
| <span class="doccomment">/// ty position = 3</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// <Vec<T>>::AssociatedItem</span> |
| <span class="doccomment">/// ^~~~~~ ^</span> |
| <span class="doccomment">/// ty position = 0</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This type is available only if Syn is built with the `"derive"` or `"full"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">QSelf</span> { |
| <span class="kw">pub</span> <span class="ident">lt_token</span>: <span class="macro">Token!</span>[<span class="op"><</span>], |
| <span class="kw">pub</span> <span class="ident">ty</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Type</span><span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">position</span>: <span class="ident">usize</span>, |
| <span class="kw">pub</span> <span class="ident">as_token</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro">Token!</span>[<span class="kw">as</span>]<span class="op">></span>, |
| <span class="kw">pub</span> <span class="ident">gt_token</span>: <span class="macro">Token!</span>[<span class="op">></span>], |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parsing</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::ext::IdentExt</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Path</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="ident"><span class="self">Self</span>::parse_helper</span>(<span class="ident">input</span>, <span class="bool-val">false</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">GenericArgument</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Lifetime</span>) <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek2</span>(<span class="macro">Token!</span>[<span class="op">+</span>]) { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">GenericArgument::Lifetime</span>(<span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>)); |
| } |
| |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Ident</span>) <span class="op">&&</span> <span class="ident">input</span>.<span class="ident">peek2</span>(<span class="macro">Token!</span>[<span class="op">=</span>]) { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">GenericArgument::Binding</span>(<span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Ident</span>) <span class="op">&&</span> <span class="ident">input</span>.<span class="ident">peek2</span>(<span class="macro">Token!</span>[:]) <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek2</span>(<span class="macro">Token!</span>[::]) { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">GenericArgument::Constraint</span>(<span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>)); |
| } |
| } |
| |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Lit</span>) <span class="op">|</span><span class="op">|</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">token::Brace</span>) { |
| <span class="kw">return</span> <span class="ident">const_argument</span>(<span class="ident">input</span>).<span class="ident">map</span>(<span class="ident">GenericArgument::Const</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| <span class="kw">let</span> <span class="ident">begin</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| |
| <span class="kw">let</span> <span class="ident">argument</span>: <span class="ident">Type</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| { |
| <span class="kw">if</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">argument</span> { |
| <span class="ident">Type::Path</span>(<span class="ident">argument</span>) |
| <span class="kw">if</span> <span class="ident">argument</span>.<span class="ident">qself</span>.<span class="ident">is_none</span>() |
| <span class="op">&&</span> <span class="ident">argument</span>.<span class="ident">path</span>.<span class="ident">leading_colon</span>.<span class="ident">is_none</span>() |
| <span class="op">&&</span> <span class="ident">argument</span>.<span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> => |
| { |
| <span class="kw">match</span> <span class="ident">argument</span>.<span class="ident">path</span>.<span class="ident">segments</span>[<span class="number">0</span>].<span class="ident">arguments</span> { |
| <span class="ident">PathArguments::AngleBracketed</span>(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <span class="kw">_</span> => <span class="bool-val">false</span>, |
| } |
| } |
| <span class="kw">_</span> => <span class="bool-val">false</span>, |
| } <span class="op">&&</span> <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op">=</span>]) { |
| <span class="ident">input</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="macro">Token!</span>[<span class="op">=</span>]<span class="op">></span>()<span class="question-mark">?</span>; |
| <span class="ident">input</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">Type</span><span class="op">></span>()<span class="question-mark">?</span>; |
| <span class="bool-val">true</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[:]) { |
| <span class="ident">input</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="macro">Token!</span>[:]<span class="op">></span>()<span class="question-mark">?</span>; |
| <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">constraint_bounds</span>)<span class="question-mark">?</span>; |
| <span class="bool-val">true</span> |
| } <span class="kw">else</span> { |
| <span class="bool-val">false</span> |
| } { |
| <span class="kw">let</span> <span class="ident">verbatim</span> <span class="op">=</span> <span class="ident">verbatim::between</span>(<span class="ident">begin</span>, <span class="ident">input</span>); |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">GenericArgument::Type</span>(<span class="ident">Type::Verbatim</span>(<span class="ident">verbatim</span>))); |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(<span class="ident">GenericArgument::Type</span>(<span class="ident">argument</span>)) |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">const_argument</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">lookahead</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">lookahead1</span>(); |
| |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Lit</span>) { |
| <span class="kw">let</span> <span class="ident">lit</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Expr::Lit</span>(<span class="ident">lit</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Ident</span>) { |
| <span class="kw">let</span> <span class="ident">ident</span>: <span class="ident">Ident</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Expr::Path</span>(<span class="ident">ExprPath</span> { |
| <span class="ident">attrs</span>: <span class="ident">Vec::new</span>(), |
| <span class="ident">qself</span>: <span class="prelude-val">None</span>, |
| <span class="ident">path</span>: <span class="ident">Path::from</span>(<span class="ident">ident</span>), |
| })); |
| } |
| } |
| |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">token::Brace</span>) { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| { |
| <span class="kw">let</span> <span class="ident">block</span>: <span class="ident">ExprBlock</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Expr::Block</span>(<span class="ident">block</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>))]</span> |
| { |
| <span class="kw">let</span> <span class="ident">begin</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>(); |
| <span class="kw">let</span> <span class="ident">content</span>; |
| <span class="macro">braced!</span>(<span class="ident">content</span> <span class="kw">in</span> <span class="ident">input</span>); |
| <span class="ident">content</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">Expr</span><span class="op">></span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">verbatim</span> <span class="op">=</span> <span class="ident">verbatim::between</span>(<span class="ident">begin</span>, <span class="ident">input</span>); |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Expr::Verbatim</span>(<span class="ident">verbatim</span>)); |
| } |
| } |
| |
| <span class="prelude-val">Err</span>(<span class="ident">lookahead</span>.<span class="ident">error</span>()) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">AngleBracketedGenericArguments</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">AngleBracketedGenericArguments</span> { |
| <span class="ident">colon2_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">lt_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">args</span>: { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>(); |
| <span class="kw">loop</span> { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op">></span>]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">args</span>.<span class="ident">push_value</span>(<span class="ident">value</span>); |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op">></span>]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">args</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>); |
| } |
| <span class="ident">args</span> |
| }, |
| <span class="ident">gt_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">ParenthesizedGenericArguments</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">content</span>; |
| <span class="prelude-val">Ok</span>(<span class="ident">ParenthesizedGenericArguments</span> { |
| <span class="ident">paren_token</span>: <span class="macro">parenthesized!</span>(<span class="ident">content</span> <span class="kw">in</span> <span class="ident">input</span>), |
| <span class="ident">inputs</span>: <span class="ident">content</span>.<span class="ident">parse_terminated</span>(<span class="ident">Type::parse</span>)<span class="question-mark">?</span>, |
| <span class="ident">output</span>: <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">ReturnType::without_plus</span>)<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">PathSegment</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="ident"><span class="self">Self</span>::parse_helper</span>(<span class="ident">input</span>, <span class="bool-val">false</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PathSegment</span> { |
| <span class="kw">fn</span> <span class="ident">parse_helper</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>, <span class="ident">expr_style</span>: <span class="ident">bool</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">super</span>]) <span class="op">|</span><span class="op">|</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="self">self</span>]) <span class="op">|</span><span class="op">|</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">crate</span>]) { |
| <span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">Ident::parse_any</span>)<span class="question-mark">?</span>; |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">PathSegment::from</span>(<span class="ident">ident</span>)); |
| } |
| |
| <span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="self">Self</span>]) { |
| <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">Ident::parse_any</span>)<span class="question-mark">?</span> |
| } <span class="kw">else</span> { |
| <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span> |
| }; |
| |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">expr_style</span> <span class="op">&&</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op"><</span>]) <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op"><</span><span class="op">=</span>]) |
| <span class="op">|</span><span class="op">|</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[::]) <span class="op">&&</span> <span class="ident">input</span>.<span class="ident">peek3</span>(<span class="macro">Token!</span>[<span class="op"><</span>]) |
| { |
| <span class="prelude-val">Ok</span>(<span class="ident">PathSegment</span> { |
| <span class="ident">ident</span>, |
| <span class="ident">arguments</span>: <span class="ident">PathArguments::AngleBracketed</span>(<span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>), |
| }) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">PathSegment::from</span>(<span class="ident">ident</span>)) |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Binding</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">Binding</span> { |
| <span class="ident">ident</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">eq_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">ty</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Constraint</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">Constraint</span> { |
| <span class="ident">ident</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">colon_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">bounds</span>: <span class="ident">constraint_bounds</span>(<span class="ident">input</span>)<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">constraint_bounds</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Punctuated</span><span class="op"><</span><span class="ident">TypeParamBound</span>, <span class="macro">Token!</span>[<span class="op">+</span>]<span class="op">></span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bounds</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>(); |
| <span class="kw">loop</span> { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[,]) <span class="op">|</span><span class="op">|</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op">></span>]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">bounds</span>.<span class="ident">push_value</span>(<span class="ident">value</span>); |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op">+</span>]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">bounds</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>); |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">bounds</span>) |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Path</span> { |
| <span class="doccomment">/// Parse a `Path` containing no path arguments on any of its segments.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This function is available only if Syn is built with the `"parsing"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use syn::{Path, Result, Token};</span> |
| <span class="doccomment">/// use syn::parse::{Parse, ParseStream};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // A simplified single `use` statement like:</span> |
| <span class="doccomment">/// //</span> |
| <span class="doccomment">/// // use std::collections::HashMap;</span> |
| <span class="doccomment">/// //</span> |
| <span class="doccomment">/// // Note that generic parameters are not allowed in a `use` statement</span> |
| <span class="doccomment">/// // so the following must not be accepted.</span> |
| <span class="doccomment">/// //</span> |
| <span class="doccomment">/// // use a::<b>::c;</span> |
| <span class="doccomment">/// struct SingleUse {</span> |
| <span class="doccomment">/// use_token: Token![use],</span> |
| <span class="doccomment">/// path: Path,</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// impl Parse for SingleUse {</span> |
| <span class="doccomment">/// fn parse(input: ParseStream) -> Result<Self> {</span> |
| <span class="doccomment">/// Ok(SingleUse {</span> |
| <span class="doccomment">/// use_token: input.parse()?,</span> |
| <span class="doccomment">/// path: input.call(Path::parse_mod_style)?,</span> |
| <span class="doccomment">/// })</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_mod_style</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">Path</span> { |
| <span class="ident">leading_colon</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">segments</span>: { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">segments</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>(); |
| <span class="kw">loop</span> { |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">Ident</span>) |
| <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">super</span>]) |
| <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="self">self</span>]) |
| <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="self">Self</span>]) |
| <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">crate</span>]) |
| { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="ident">Ident::parse_any</span>(<span class="ident">input</span>)<span class="question-mark">?</span>; |
| <span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">PathSegment::from</span>(<span class="ident">ident</span>)); |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[::]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">punct</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">segments</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>); |
| } |
| <span class="kw">if</span> <span class="ident">segments</span>.<span class="ident">is_empty</span>() { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">input</span>.<span class="ident">error</span>(<span class="string">"expected path"</span>)); |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">segments</span>.<span class="ident">trailing_punct</span>() { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">input</span>.<span class="ident">error</span>(<span class="string">"expected path segment"</span>)); |
| } |
| <span class="ident">segments</span> |
| }, |
| }) |
| } |
| |
| <span class="doccomment">/// Determines whether this is a path of length 1 equal to the given</span> |
| <span class="doccomment">/// ident.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For them to compare equal, it must be the case that:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// - the path has no leading colon,</span> |
| <span class="doccomment">/// - the number of path segments is 1,</span> |
| <span class="doccomment">/// - the first path segment has no angle bracketed or parenthesized</span> |
| <span class="doccomment">/// path arguments, and</span> |
| <span class="doccomment">/// - the ident of the first path segment is equal to the given one.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This function is available only if Syn is built with the `"parsing"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use syn::{Attribute, Error, Meta, NestedMeta, Result};</span> |
| <span class="doccomment">/// # use std::iter::FromIterator;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// fn get_serde_meta_items(attr: &Attribute) -> Result<Vec<NestedMeta>> {</span> |
| <span class="doccomment">/// if attr.path.is_ident("serde") {</span> |
| <span class="doccomment">/// match attr.parse_meta()? {</span> |
| <span class="doccomment">/// Meta::List(meta) => Ok(Vec::from_iter(meta.nested)),</span> |
| <span class="doccomment">/// bad => Err(Error::new_spanned(bad, "unrecognized attribute")),</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// } else {</span> |
| <span class="doccomment">/// Ok(Vec::new())</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_ident</span><span class="op"><</span><span class="ident">I</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">ident</span>: <span class="kw-2">&</span><span class="ident">I</span>) -> <span class="ident">bool</span> |
| <span class="kw">where</span> |
| <span class="ident">Ident</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>, |
| { |
| <span class="kw">match</span> <span class="self">self</span>.<span class="ident">get_ident</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">id</span>) => <span class="ident">id</span> <span class="op">==</span> <span class="ident">ident</span>, |
| <span class="prelude-val">None</span> => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If this path consists of a single ident, returns the ident.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// A path is considered an ident if:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// - the path has no leading colon,</span> |
| <span class="doccomment">/// - the number of path segments is 1, and</span> |
| <span class="doccomment">/// - the first path segment has no angle bracketed or parenthesized</span> |
| <span class="doccomment">/// path arguments.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *This function is available only if Syn is built with the `"parsing"`</span> |
| <span class="doccomment">/// feature.*</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ident</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Ident</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">leading_colon</span>.<span class="ident">is_none</span>() |
| <span class="op">&&</span> <span class="self">self</span>.<span class="ident">segments</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> |
| <span class="op">&&</span> <span class="self">self</span>.<span class="ident">segments</span>[<span class="number">0</span>].<span class="ident">arguments</span>.<span class="ident">is_none</span>() |
| { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">segments</span>[<span class="number">0</span>].<span class="ident">ident</span>) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">parse_helper</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>, <span class="ident">expr_style</span>: <span class="ident">bool</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span> { |
| <span class="ident">leading_colon</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">segments</span>: { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">segments</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>(); |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">PathSegment::parse_helper</span>(<span class="ident">input</span>, <span class="ident">expr_style</span>)<span class="question-mark">?</span>; |
| <span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">value</span>); |
| <span class="ident">segments</span> |
| }, |
| }; |
| <span class="ident">Path::parse_rest</span>(<span class="ident">input</span>, <span class="kw-2">&mut</span> <span class="ident">path</span>, <span class="ident">expr_style</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="ident">path</span>) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">parse_rest</span>( |
| <span class="ident">input</span>: <span class="ident">ParseStream</span>, |
| <span class="ident">path</span>: <span class="kw-2">&mut</span> <span class="self">Self</span>, |
| <span class="ident">expr_style</span>: <span class="ident">bool</span>, |
| ) -> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">while</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[::]) <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek3</span>(<span class="ident">token::Paren</span>) { |
| <span class="kw">let</span> <span class="ident">punct</span>: <span class="macro">Token!</span>[::] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>); |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">PathSegment::parse_helper</span>(<span class="ident">input</span>, <span class="ident">expr_style</span>)<span class="question-mark">?</span>; |
| <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">value</span>); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">qpath</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>, <span class="ident">expr_style</span>: <span class="ident">bool</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">QSelf</span><span class="op">></span>, <span class="ident">Path</span>)<span class="op">></span> { |
| <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="op"><</span>]) { |
| <span class="kw">let</span> <span class="ident">lt_token</span>: <span class="macro">Token!</span>[<span class="op"><</span>] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">this</span>: <span class="ident">Type</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">as</span>]) { |
| <span class="kw">let</span> <span class="ident">as_token</span>: <span class="macro">Token!</span>[<span class="kw">as</span>] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">path</span>: <span class="ident">Path</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>((<span class="ident">as_token</span>, <span class="ident">path</span>)) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| }; |
| <span class="kw">let</span> <span class="ident">gt_token</span>: <span class="macro">Token!</span>[<span class="op">></span>] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">colon2_token</span>: <span class="macro">Token!</span>[::] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rest</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>(); |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">PathSegment::parse_helper</span>(<span class="ident">input</span>, <span class="ident">expr_style</span>)<span class="question-mark">?</span>; |
| <span class="ident">rest</span>.<span class="ident">push_value</span>(<span class="ident">path</span>); |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[::]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let</span> <span class="ident">punct</span>: <span class="macro">Token!</span>[::] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>; |
| <span class="ident">rest</span>.<span class="ident">push_punct</span>(<span class="ident">punct</span>); |
| } |
| <span class="kw">let</span> (<span class="ident">position</span>, <span class="ident">as_token</span>, <span class="ident">path</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">path</span> { |
| <span class="prelude-val">Some</span>((<span class="ident">as_token</span>, <span class="kw-2">mut</span> <span class="ident">path</span>)) => { |
| <span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">len</span>(); |
| <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">push_punct</span>(<span class="ident">colon2_token</span>); |
| <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">extend</span>(<span class="ident">rest</span>.<span class="ident">into_pairs</span>()); |
| (<span class="ident">pos</span>, <span class="prelude-val">Some</span>(<span class="ident">as_token</span>), <span class="ident">path</span>) |
| } |
| <span class="prelude-val">None</span> => { |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span> { |
| <span class="ident">leading_colon</span>: <span class="prelude-val">Some</span>(<span class="ident">colon2_token</span>), |
| <span class="ident">segments</span>: <span class="ident">rest</span>, |
| }; |
| (<span class="number">0</span>, <span class="prelude-val">None</span>, <span class="ident">path</span>) |
| } |
| }; |
| <span class="kw">let</span> <span class="ident">qself</span> <span class="op">=</span> <span class="ident">QSelf</span> { |
| <span class="ident">lt_token</span>, |
| <span class="ident">ty</span>: <span class="ident">Box::new</span>(<span class="ident">this</span>), |
| <span class="ident">position</span>, |
| <span class="ident">as_token</span>, |
| <span class="ident">gt_token</span>, |
| }; |
| <span class="prelude-val">Ok</span>((<span class="prelude-val">Some</span>(<span class="ident">qself</span>), <span class="ident">path</span>)) |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path::parse_helper</span>(<span class="ident">input</span>, <span class="ident">expr_style</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, <span class="ident">path</span>)) |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">printing</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::print::TokensOrDefault</span>; |
| <span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>; |
| <span class="kw">use</span> <span class="ident">quote::ToTokens</span>; |
| <span class="kw">use</span> <span class="ident">std::cmp</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Path</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">leading_colon</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">segments</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">PathSegment</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">arguments</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">PathArguments</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">PathArguments::None</span> => {} |
| <span class="ident">PathArguments::AngleBracketed</span>(<span class="ident">arguments</span>) => { |
| <span class="ident">arguments</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| <span class="ident">PathArguments::Parenthesized</span>(<span class="ident">arguments</span>) => { |
| <span class="ident">arguments</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">GenericArgument</span> { |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::match_same_arms</span>)]</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">GenericArgument::Lifetime</span>(<span class="ident">lt</span>) => <span class="ident">lt</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| <span class="ident">GenericArgument::Type</span>(<span class="ident">ty</span>) => <span class="ident">ty</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| <span class="ident">GenericArgument::Binding</span>(<span class="ident">tb</span>) => <span class="ident">tb</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| <span class="ident">GenericArgument::Constraint</span>(<span class="ident">tc</span>) => <span class="ident">tc</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| <span class="ident">GenericArgument::Const</span>(<span class="ident">e</span>) => <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">e</span> { |
| <span class="ident">Expr::Lit</span>(<span class="kw">_</span>) => <span class="ident">e</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| |
| <span class="comment">// NOTE: We should probably support parsing blocks with only</span> |
| <span class="comment">// expressions in them without the full feature for const</span> |
| <span class="comment">// generics.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span> |
| <span class="ident">Expr::Block</span>(<span class="kw">_</span>) => <span class="ident">e</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>), |
| |
| <span class="comment">// ERROR CORRECTION: Add braces to make sure that the</span> |
| <span class="comment">// generated code is valid.</span> |
| <span class="kw">_</span> => <span class="ident">token::Brace::default</span>().<span class="ident">surround</span>(<span class="ident">tokens</span>, <span class="op">|</span><span class="ident">tokens</span><span class="op">|</span> { |
| <span class="ident">e</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| }), |
| }, |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">AngleBracketedGenericArguments</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">colon2_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">lt_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| |
| <span class="comment">// Print lifetimes before types and consts, all before bindings,</span> |
| <span class="comment">// regardless of their order in self.args.</span> |
| <span class="comment">//</span> |
| <span class="comment">// TODO: ordering rules for const arguments vs type arguments have</span> |
| <span class="comment">// not been settled yet. https://github.com/rust-lang/rust/issues/44580</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">trailing_or_empty</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="kw">for</span> <span class="ident">param</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">pairs</span>() { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">param</span>.<span class="ident">value</span>() { |
| <span class="ident">GenericArgument::Lifetime</span>(<span class="kw">_</span>) => { |
| <span class="ident">param</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">trailing_or_empty</span> <span class="op">=</span> <span class="ident">param</span>.<span class="ident">punct</span>().<span class="ident">is_some</span>(); |
| } |
| <span class="ident">GenericArgument::Type</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Binding</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Constraint</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Const</span>(<span class="kw">_</span>) => {} |
| } |
| } |
| <span class="kw">for</span> <span class="ident">param</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">pairs</span>() { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">param</span>.<span class="ident">value</span>() { |
| <span class="ident">GenericArgument::Type</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">GenericArgument::Const</span>(<span class="kw">_</span>) => { |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">trailing_or_empty</span> { |
| <span class="op"><</span><span class="macro">Token!</span>[,]<span class="op">></span><span class="ident">::default</span>().<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| <span class="ident">param</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">trailing_or_empty</span> <span class="op">=</span> <span class="ident">param</span>.<span class="ident">punct</span>().<span class="ident">is_some</span>(); |
| } |
| <span class="ident">GenericArgument::Lifetime</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Binding</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Constraint</span>(<span class="kw">_</span>) => {} |
| } |
| } |
| <span class="kw">for</span> <span class="ident">param</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">pairs</span>() { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">param</span>.<span class="ident">value</span>() { |
| <span class="ident">GenericArgument::Binding</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">GenericArgument::Constraint</span>(<span class="kw">_</span>) => { |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">trailing_or_empty</span> { |
| <span class="op"><</span><span class="macro">Token!</span>[,]<span class="op">></span><span class="ident">::default</span>().<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| <span class="ident">param</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">trailing_or_empty</span> <span class="op">=</span> <span class="ident">param</span>.<span class="ident">punct</span>().<span class="ident">is_some</span>(); |
| } |
| <span class="ident">GenericArgument::Lifetime</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Type</span>(<span class="kw">_</span>) |
| <span class="op">|</span> <span class="ident">GenericArgument::Const</span>(<span class="kw">_</span>) => {} |
| } |
| } |
| |
| <span class="self">self</span>.<span class="ident">gt_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Binding</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">eq_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">ty</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Constraint</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">colon_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="self">self</span>.<span class="ident">bounds</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">ParenthesizedGenericArguments</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">&mut</span> <span class="ident">TokenStream</span>) { |
| <span class="self">self</span>.<span class="ident">paren_token</span>.<span class="ident">surround</span>(<span class="ident">tokens</span>, <span class="op">|</span><span class="ident">tokens</span><span class="op">|</span> { |
| <span class="self">self</span>.<span class="ident">inputs</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| }); |
| <span class="self">self</span>.<span class="ident">output</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">private</span> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">print_path</span>(<span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>, <span class="ident">qself</span>: <span class="kw-2">&</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">QSelf</span><span class="op">></span>, <span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">Path</span>) { |
| <span class="kw">let</span> <span class="ident">qself</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">qself</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">qself</span>) => <span class="ident">qself</span>, |
| <span class="prelude-val">None</span> => { |
| <span class="ident">path</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="kw">return</span>; |
| } |
| }; |
| <span class="ident">qself</span>.<span class="ident">lt_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">qself</span>.<span class="ident">ty</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| |
| <span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="ident">cmp::min</span>(<span class="ident">qself</span>.<span class="ident">position</span>, <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">len</span>()); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">segments</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">pairs</span>(); |
| <span class="kw">if</span> <span class="ident">pos</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="ident">TokensOrDefault</span>(<span class="kw-2">&</span><span class="ident">qself</span>.<span class="ident">as_token</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">path</span>.<span class="ident">leading_colon</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">segment</span>) <span class="kw">in</span> <span class="ident">segments</span>.<span class="ident">by_ref</span>().<span class="ident">take</span>(<span class="ident">pos</span>).<span class="ident">enumerate</span>() { |
| <span class="kw">if</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span> <span class="op">==</span> <span class="ident">pos</span> { |
| <span class="ident">segment</span>.<span class="ident">value</span>().<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">qself</span>.<span class="ident">gt_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">segment</span>.<span class="ident">punct</span>().<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } <span class="kw">else</span> { |
| <span class="ident">segment</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| } <span class="kw">else</span> { |
| <span class="ident">qself</span>.<span class="ident">gt_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| <span class="ident">path</span>.<span class="ident">leading_colon</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| <span class="kw">for</span> <span class="ident">segment</span> <span class="kw">in</span> <span class="ident">segments</span> { |
| <span class="ident">segment</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>); |
| } |
| } |
| } |
| } |
| </code></pre></div> |
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