| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-2.0.18/src/expr.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>expr.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../syn/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="3129">3129</span> |
| <span id="3130">3130</span> |
| <span id="3131">3131</span> |
| <span id="3132">3132</span> |
| <span id="3133">3133</span> |
| <span id="3134">3134</span> |
| <span id="3135">3135</span> |
| <span id="3136">3136</span> |
| <span id="3137">3137</span> |
| <span id="3138">3138</span> |
| <span id="3139">3139</span> |
| <span id="3140">3140</span> |
| <span id="3141">3141</span> |
| <span id="3142">3142</span> |
| <span id="3143">3143</span> |
| <span id="3144">3144</span> |
| <span id="3145">3145</span> |
| <span id="3146">3146</span> |
| <span id="3147">3147</span> |
| <span id="3148">3148</span> |
| <span id="3149">3149</span> |
| <span id="3150">3150</span> |
| <span id="3151">3151</span> |
| <span id="3152">3152</span> |
| <span id="3153">3153</span> |
| <span id="3154">3154</span> |
| <span id="3155">3155</span> |
| <span id="3156">3156</span> |
| <span id="3157">3157</span> |
| <span id="3158">3158</span> |
| <span id="3159">3159</span> |
| <span id="3160">3160</span> |
| <span id="3161">3161</span> |
| <span id="3162">3162</span> |
| <span id="3163">3163</span> |
| <span id="3164">3164</span> |
| <span id="3165">3165</span> |
| <span id="3166">3166</span> |
| <span id="3167">3167</span> |
| <span id="3168">3168</span> |
| <span id="3169">3169</span> |
| <span id="3170">3170</span> |
| <span id="3171">3171</span> |
| <span id="3172">3172</span> |
| <span id="3173">3173</span> |
| <span id="3174">3174</span> |
| <span id="3175">3175</span> |
| <span id="3176">3176</span> |
| <span id="3177">3177</span> |
| <span id="3178">3178</span> |
| <span id="3179">3179</span> |
| <span id="3180">3180</span> |
| <span id="3181">3181</span> |
| <span id="3182">3182</span> |
| <span id="3183">3183</span> |
| <span id="3184">3184</span> |
| <span id="3185">3185</span> |
| <span id="3186">3186</span> |
| <span id="3187">3187</span> |
| <span id="3188">3188</span> |
| <span id="3189">3189</span> |
| <span id="3190">3190</span> |
| <span id="3191">3191</span> |
| <span id="3192">3192</span> |
| <span id="3193">3193</span> |
| <span id="3194">3194</span> |
| <span id="3195">3195</span> |
| <span id="3196">3196</span> |
| <span id="3197">3197</span> |
| <span id="3198">3198</span> |
| <span id="3199">3199</span> |
| <span id="3200">3200</span> |
| <span id="3201">3201</span> |
| <span id="3202">3202</span> |
| <span id="3203">3203</span> |
| <span id="3204">3204</span> |
| <span id="3205">3205</span> |
| <span id="3206">3206</span> |
| <span id="3207">3207</span> |
| <span id="3208">3208</span> |
| <span id="3209">3209</span> |
| <span id="3210">3210</span> |
| <span id="3211">3211</span> |
| <span id="3212">3212</span> |
| <span id="3213">3213</span> |
| <span id="3214">3214</span> |
| <span id="3215">3215</span> |
| <span id="3216">3216</span> |
| <span id="3217">3217</span> |
| <span id="3218">3218</span> |
| <span id="3219">3219</span> |
| <span id="3220">3220</span> |
| <span id="3221">3221</span> |
| <span id="3222">3222</span> |
| <span id="3223">3223</span> |
| <span id="3224">3224</span> |
| <span id="3225">3225</span> |
| <span id="3226">3226</span> |
| <span id="3227">3227</span> |
| <span id="3228">3228</span> |
| <span id="3229">3229</span> |
| <span id="3230">3230</span> |
| <span id="3231">3231</span> |
| <span id="3232">3232</span> |
| <span id="3233">3233</span> |
| <span id="3234">3234</span> |
| <span id="3235">3235</span> |
| <span id="3236">3236</span> |
| <span id="3237">3237</span> |
| <span id="3238">3238</span> |
| <span id="3239">3239</span> |
| <span id="3240">3240</span> |
| <span id="3241">3241</span> |
| <span id="3242">3242</span> |
| <span id="3243">3243</span> |
| <span id="3244">3244</span> |
| <span id="3245">3245</span> |
| <span id="3246">3246</span> |
| <span id="3247">3247</span> |
| <span id="3248">3248</span> |
| <span id="3249">3249</span> |
| <span id="3250">3250</span> |
| <span id="3251">3251</span> |
| <span id="3252">3252</span> |
| <span id="3253">3253</span> |
| <span id="3254">3254</span> |
| <span id="3255">3255</span> |
| <span id="3256">3256</span> |
| <span id="3257">3257</span> |
| <span id="3258">3258</span> |
| <span id="3259">3259</span> |
| <span id="3260">3260</span> |
| <span id="3261">3261</span> |
| <span id="3262">3262</span> |
| <span id="3263">3263</span> |
| <span id="3264">3264</span> |
| <span id="3265">3265</span> |
| <span id="3266">3266</span> |
| <span id="3267">3267</span> |
| <span id="3268">3268</span> |
| <span id="3269">3269</span> |
| <span id="3270">3270</span> |
| <span id="3271">3271</span> |
| <span id="3272">3272</span> |
| <span id="3273">3273</span> |
| <span id="3274">3274</span> |
| <span id="3275">3275</span> |
| <span id="3276">3276</span> |
| <span id="3277">3277</span> |
| <span id="3278">3278</span> |
| <span id="3279">3279</span> |
| <span id="3280">3280</span> |
| <span id="3281">3281</span> |
| <span id="3282">3282</span> |
| <span id="3283">3283</span> |
| <span id="3284">3284</span> |
| <span id="3285">3285</span> |
| <span id="3286">3286</span> |
| <span id="3287">3287</span> |
| <span id="3288">3288</span> |
| <span id="3289">3289</span> |
| <span id="3290">3290</span> |
| <span id="3291">3291</span> |
| <span id="3292">3292</span> |
| <span id="3293">3293</span> |
| <span id="3294">3294</span> |
| <span id="3295">3295</span> |
| <span id="3296">3296</span> |
| <span id="3297">3297</span> |
| <span id="3298">3298</span> |
| <span id="3299">3299</span> |
| <span id="3300">3300</span> |
| <span id="3301">3301</span> |
| <span id="3302">3302</span> |
| <span id="3303">3303</span> |
| <span id="3304">3304</span> |
| <span id="3305">3305</span> |
| <span id="3306">3306</span> |
| <span id="3307">3307</span> |
| <span id="3308">3308</span> |
| <span id="3309">3309</span> |
| <span id="3310">3310</span> |
| <span id="3311">3311</span> |
| <span id="3312">3312</span> |
| <span id="3313">3313</span> |
| <span id="3314">3314</span> |
| <span id="3315">3315</span> |
| <span id="3316">3316</span> |
| <span id="3317">3317</span> |
| <span id="3318">3318</span> |
| <span id="3319">3319</span> |
| <span id="3320">3320</span> |
| <span id="3321">3321</span> |
| <span id="3322">3322</span> |
| <span id="3323">3323</span> |
| <span id="3324">3324</span> |
| <span id="3325">3325</span> |
| <span id="3326">3326</span> |
| <span id="3327">3327</span> |
| <span id="3328">3328</span> |
| <span id="3329">3329</span> |
| <span id="3330">3330</span> |
| <span id="3331">3331</span> |
| <span id="3332">3332</span> |
| <span id="3333">3333</span> |
| <span id="3334">3334</span> |
| <span id="3335">3335</span> |
| <span id="3336">3336</span> |
| <span id="3337">3337</span> |
| <span id="3338">3338</span> |
| <span id="3339">3339</span> |
| <span id="3340">3340</span> |
| <span id="3341">3341</span> |
| <span id="3342">3342</span> |
| <span id="3343">3343</span> |
| <span id="3344">3344</span> |
| <span id="3345">3345</span> |
| <span id="3346">3346</span> |
| <span id="3347">3347</span> |
| <span id="3348">3348</span> |
| <span id="3349">3349</span> |
| <span id="3350">3350</span> |
| <span id="3351">3351</span> |
| <span id="3352">3352</span> |
| <span id="3353">3353</span> |
| <span id="3354">3354</span> |
| <span id="3355">3355</span> |
| <span id="3356">3356</span> |
| <span id="3357">3357</span> |
| <span id="3358">3358</span> |
| <span id="3359">3359</span> |
| <span id="3360">3360</span> |
| <span id="3361">3361</span> |
| <span id="3362">3362</span> |
| <span id="3363">3363</span> |
| <span id="3364">3364</span> |
| <span id="3365">3365</span> |
| <span id="3366">3366</span> |
| <span id="3367">3367</span> |
| </pre><pre class="rust"><code><span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::punctuated::Punctuated; |
| <span class="kw">use </span>proc_macro2::{Span, TokenStream}; |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">use </span>quote::IdentFragment; |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">use </span>std::fmt::{<span class="self">self</span>, Display}; |
| <span class="kw">use </span>std::hash::{Hash, Hasher}; |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span>std::mem; |
| |
| <span class="macro">ast_enum_of_structs! </span>{ |
| <span class="doccomment">/// A Rust expression. |
| /// |
| /// *This type is available only if Syn is built with the `"derive"` or `"full"` |
| /// feature, but most of the variants are not available unless "full" is enabled.* |
| /// |
| /// # Syntax tree enums |
| /// |
| /// This type is a syntax tree enum. In Syn this and other syntax tree enums |
| /// are designed to be traversed using the following rebinding idiom. |
| /// |
| /// ``` |
| /// # use syn::Expr; |
| /// # |
| /// # fn example(expr: Expr) { |
| /// # const IGNORE: &str = stringify! { |
| /// let expr: Expr = /* ... */; |
| /// # }; |
| /// match expr { |
| /// Expr::MethodCall(expr) => { |
| /// /* ... */ |
| /// } |
| /// Expr::Cast(expr) => { |
| /// /* ... */ |
| /// } |
| /// Expr::If(expr) => { |
| /// /* ... */ |
| /// } |
| /// |
| /// /* ... */ |
| /// # _ => {} |
| /// # } |
| /// # } |
| /// ``` |
| /// |
| /// We begin with a variable `expr` of type `Expr` that has no fields |
| /// (because it is an enum), and by matching on it and rebinding a variable |
| /// with the same name `expr` we effectively imbue our variable with all of |
| /// the data fields provided by the variant that it turned out to be. So for |
| /// example above if we ended up in the `MethodCall` case then we get to use |
| /// `expr.receiver`, `expr.args` etc; if we ended up in the `If` case we get |
| /// to use `expr.cond`, `expr.then_branch`, `expr.else_branch`. |
| /// |
| /// This approach avoids repeating the variant names twice on every line. |
| /// |
| /// ``` |
| /// # use syn::{Expr, ExprMethodCall}; |
| /// # |
| /// # fn example(expr: Expr) { |
| /// // Repetitive; recommend not doing this. |
| /// match expr { |
| /// Expr::MethodCall(ExprMethodCall { method, args, .. }) => { |
| /// # } |
| /// # _ => {} |
| /// # } |
| /// # } |
| /// ``` |
| /// |
| /// In general, the name to which a syntax tree enum variant is bound should |
| /// be a suitable name for the complete syntax tree enum type. |
| /// |
| /// ``` |
| /// # use syn::{Expr, ExprField}; |
| /// # |
| /// # fn example(discriminant: ExprField) { |
| /// // Binding is called `base` which is the name I would use if I were |
| /// // assigning `*discriminant.base` without an `if let`. |
| /// if let Expr::Tuple(base) = *discriminant.base { |
| /// # } |
| /// # } |
| /// ``` |
| /// |
| /// A sign that you may not be choosing the right variable names is if you |
| /// see names getting repeated in your code, like accessing |
| /// `receiver.receiver` or `pat.pat` or `cond.cond`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>Expr { |
| <span class="doccomment">/// A slice literal expression: `[a, b, c, d]`. |
| </span>Array(ExprArray), |
| |
| <span class="doccomment">/// An assignment expression: `a = compute()`. |
| </span>Assign(ExprAssign), |
| |
| <span class="doccomment">/// An async block: `async { ... }`. |
| </span>Async(ExprAsync), |
| |
| <span class="doccomment">/// An await expression: `fut.await`. |
| </span>Await(ExprAwait), |
| |
| <span class="doccomment">/// A binary operation: `a + b`, `a += b`. |
| </span>Binary(ExprBinary), |
| |
| <span class="doccomment">/// A blocked scope: `{ ... }`. |
| </span>Block(ExprBlock), |
| |
| <span class="doccomment">/// A `break`, with an optional label to break and an optional |
| /// expression. |
| </span>Break(ExprBreak), |
| |
| <span class="doccomment">/// A function call expression: `invoke(a, b)`. |
| </span>Call(ExprCall), |
| |
| <span class="doccomment">/// A cast expression: `foo as f64`. |
| </span>Cast(ExprCast), |
| |
| <span class="doccomment">/// A closure expression: `|a, b| a + b`. |
| </span>Closure(ExprClosure), |
| |
| <span class="doccomment">/// A const block: `const { ... }`. |
| </span>Const(ExprConst), |
| |
| <span class="doccomment">/// A `continue`, with an optional label. |
| </span>Continue(ExprContinue), |
| |
| <span class="doccomment">/// Access of a named struct field (`obj.k`) or unnamed tuple struct |
| /// field (`obj.0`). |
| </span>Field(ExprField), |
| |
| <span class="doccomment">/// A for loop: `for pat in expr { ... }`. |
| </span>ForLoop(ExprForLoop), |
| |
| <span class="doccomment">/// An expression contained within invisible delimiters. |
| /// |
| /// This variant is important for faithfully representing the precedence |
| /// of expressions and is related to `None`-delimited spans in a |
| /// `TokenStream`. |
| </span>Group(ExprGroup), |
| |
| <span class="doccomment">/// An `if` expression with an optional `else` block: `if expr { ... } |
| /// else { ... }`. |
| /// |
| /// The `else` branch expression may only be an `If` or `Block` |
| /// expression, not any of the other types of expression. |
| </span>If(ExprIf), |
| |
| <span class="doccomment">/// A square bracketed indexing expression: `vector[2]`. |
| </span>Index(ExprIndex), |
| |
| <span class="doccomment">/// The inferred value of a const generic argument, denoted `_`. |
| </span>Infer(ExprInfer), |
| |
| <span class="doccomment">/// A `let` guard: `let Some(x) = opt`. |
| </span>Let(ExprLet), |
| |
| <span class="doccomment">/// A literal in place of an expression: `1`, `"foo"`. |
| </span>Lit(ExprLit), |
| |
| <span class="doccomment">/// Conditionless loop: `loop { ... }`. |
| </span>Loop(ExprLoop), |
| |
| <span class="doccomment">/// A macro invocation expression: `format!("{}", q)`. |
| </span>Macro(ExprMacro), |
| |
| <span class="doccomment">/// A `match` expression: `match n { Some(n) => {}, None => {} }`. |
| </span>Match(ExprMatch), |
| |
| <span class="doccomment">/// A method call expression: `x.foo::<T>(a, b)`. |
| </span>MethodCall(ExprMethodCall), |
| |
| <span class="doccomment">/// A parenthesized expression: `(a + b)`. |
| </span>Paren(ExprParen), |
| |
| <span class="doccomment">/// A path like `std::mem::replace` possibly containing generic |
| /// parameters and a qualified self-type. |
| /// |
| /// A plain identifier like `x` is a path of length 1. |
| </span>Path(ExprPath), |
| |
| <span class="doccomment">/// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`. |
| </span>Range(ExprRange), |
| |
| <span class="doccomment">/// A referencing operation: `&a` or `&mut a`. |
| </span>Reference(ExprReference), |
| |
| <span class="doccomment">/// An array literal constructed from one repeated element: `[0u8; N]`. |
| </span>Repeat(ExprRepeat), |
| |
| <span class="doccomment">/// A `return`, with an optional value to be returned. |
| </span>Return(ExprReturn), |
| |
| <span class="doccomment">/// A struct literal expression: `Point { x: 1, y: 1 }`. |
| /// |
| /// The `rest` provides the value of the remaining fields as in `S { a: |
| /// 1, b: 1, ..rest }`. |
| </span>Struct(ExprStruct), |
| |
| <span class="doccomment">/// A try-expression: `expr?`. |
| </span>Try(ExprTry), |
| |
| <span class="doccomment">/// A try block: `try { ... }`. |
| </span>TryBlock(ExprTryBlock), |
| |
| <span class="doccomment">/// A tuple expression: `(a, b, c, d)`. |
| </span>Tuple(ExprTuple), |
| |
| <span class="doccomment">/// A unary operation: `!x`, `*x`. |
| </span>Unary(ExprUnary), |
| |
| <span class="doccomment">/// An unsafe block: `unsafe { ... }`. |
| </span>Unsafe(ExprUnsafe), |
| |
| <span class="doccomment">/// Tokens in expression position not interpreted by Syn. |
| </span>Verbatim(TokenStream), |
| |
| <span class="doccomment">/// A while loop: `while expr { ... }`. |
| </span>While(ExprWhile), |
| |
| <span class="doccomment">/// A yield expression: `yield expr`. |
| </span>Yield(ExprYield), |
| |
| <span class="comment">// For testing exhaustiveness in downstream code, use the following idiom: |
| // |
| // match expr { |
| // Expr::Array(expr) => {...} |
| // Expr::Assign(expr) => {...} |
| // ... |
| // Expr::Yield(expr) => {...} |
| // |
| // #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))] |
| // _ => { /* some sane fallback */ } |
| // } |
| // |
| // This way we fail your tests but don't break your library when adding |
| // a variant. You will be notified by a test failure when a variant is |
| // added, so that you can add code to handle it, but your library will |
| // continue to compile and work for downstream users in the interim. |
| </span>} |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A slice literal expression: `[a, b, c, d]`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprArray #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>bracket_token: token::Bracket, |
| <span class="kw">pub </span>elems: Punctuated<Expr, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An assignment expression: `a = compute()`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprAssign #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>left: Box<Expr>, |
| <span class="kw">pub </span>eq_token: <span class="macro">Token!</span>[=], |
| <span class="kw">pub </span>right: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An async block: `async { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprAsync #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>async_token: <span class="macro">Token!</span>[<span class="kw">async</span>], |
| <span class="kw">pub </span>capture: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">move</span>]>, |
| <span class="kw">pub </span>block: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An await expression: `fut.await`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprAwait #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>base: Box<Expr>, |
| <span class="kw">pub </span>dot_token: <span class="macro">Token!</span>[.], |
| <span class="kw">pub </span>await_token: <span class="macro">Token!</span>[<span class="kw">await</span>], |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A binary operation: `a + b`, `a += b`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprBinary { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>left: Box<Expr>, |
| <span class="kw">pub </span>op: BinOp, |
| <span class="kw">pub </span>right: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A blocked scope: `{ ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprBlock #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Label>, |
| <span class="kw">pub </span>block: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A `break`, with an optional label to break and an optional |
| /// expression. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprBreak #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>break_token: <span class="macro">Token!</span>[<span class="kw">break</span>], |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Lifetime>, |
| <span class="kw">pub </span>expr: <span class="prelude-ty">Option</span><Box<Expr>>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A function call expression: `invoke(a, b)`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprCall { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>func: Box<Expr>, |
| <span class="kw">pub </span>paren_token: token::Paren, |
| <span class="kw">pub </span>args: Punctuated<Expr, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A cast expression: `foo as f64`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprCast { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>as_token: <span class="macro">Token!</span>[<span class="kw">as</span>], |
| <span class="kw">pub </span>ty: Box<Type>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A closure expression: `|a, b| a + b`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprClosure #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>lifetimes: <span class="prelude-ty">Option</span><BoundLifetimes>, |
| <span class="kw">pub </span>constness: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">const</span>]>, |
| <span class="kw">pub </span>movability: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">static</span>]>, |
| <span class="kw">pub </span>asyncness: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">async</span>]>, |
| <span class="kw">pub </span>capture: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">move</span>]>, |
| <span class="kw">pub </span>or1_token: <span class="macro">Token!</span>[|], |
| <span class="kw">pub </span>inputs: Punctuated<Pat, <span class="macro">Token!</span>[,]>, |
| <span class="kw">pub </span>or2_token: <span class="macro">Token!</span>[|], |
| <span class="kw">pub </span>output: ReturnType, |
| <span class="kw">pub </span>body: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A const block: `const { ... }`. |
| </span><span class="kw">pub struct </span>ExprConst #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>const_token: <span class="macro">Token!</span>[<span class="kw">const</span>], |
| <span class="kw">pub </span>block: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A `continue`, with an optional label. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprContinue #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>continue_token: <span class="macro">Token!</span>[<span class="kw">continue</span>], |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Lifetime>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// Access of a named struct field (`obj.k`) or unnamed tuple struct |
| /// field (`obj.0`). |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprField { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>base: Box<Expr>, |
| <span class="kw">pub </span>dot_token: <span class="macro">Token!</span>[.], |
| <span class="kw">pub </span>member: Member, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A for loop: `for pat in expr { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprForLoop #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Label>, |
| <span class="kw">pub </span>for_token: <span class="macro">Token!</span>[<span class="kw">for</span>], |
| <span class="kw">pub </span>pat: Box<Pat>, |
| <span class="kw">pub </span>in_token: <span class="macro">Token!</span>[<span class="kw">in</span>], |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>body: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An expression contained within invisible delimiters. |
| /// |
| /// This variant is important for faithfully representing the precedence |
| /// of expressions and is related to `None`-delimited spans in a |
| /// `TokenStream`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprGroup { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>group_token: token::Group, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An `if` expression with an optional `else` block: `if expr { ... } |
| /// else { ... }`. |
| /// |
| /// The `else` branch expression may only be an `If` or `Block` |
| /// expression, not any of the other types of expression. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprIf #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>if_token: <span class="macro">Token!</span>[<span class="kw">if</span>], |
| <span class="kw">pub </span>cond: Box<Expr>, |
| <span class="kw">pub </span>then_branch: Block, |
| <span class="kw">pub </span>else_branch: <span class="prelude-ty">Option</span><(<span class="macro">Token!</span>[<span class="kw">else</span>], Box<Expr>)>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A square bracketed indexing expression: `vector[2]`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprIndex { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>bracket_token: token::Bracket, |
| <span class="kw">pub </span>index: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// The inferred value of a const generic argument, denoted `_`. |
| </span><span class="kw">pub struct </span>ExprInfer #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>underscore_token: <span class="macro">Token!</span>[<span class="kw">_</span>], |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A `let` guard: `let Some(x) = opt`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprLet #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>let_token: <span class="macro">Token!</span>[<span class="kw">let</span>], |
| <span class="kw">pub </span>pat: Box<Pat>, |
| <span class="kw">pub </span>eq_token: <span class="macro">Token!</span>[=], |
| <span class="kw">pub </span>expr: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A literal in place of an expression: `1`, `"foo"`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprLit { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>lit: Lit, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// Conditionless loop: `loop { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprLoop #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Label>, |
| <span class="kw">pub </span>loop_token: <span class="macro">Token!</span>[<span class="kw">loop</span>], |
| <span class="kw">pub </span>body: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A macro invocation expression: `format!("{}", q)`. |
| </span><span class="kw">pub struct </span>ExprMacro { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>mac: Macro, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A `match` expression: `match n { Some(n) => {}, None => {} }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprMatch #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>match_token: <span class="macro">Token!</span>[<span class="kw">match</span>], |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>brace_token: token::Brace, |
| <span class="kw">pub </span>arms: Vec<Arm>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A method call expression: `x.foo::<T>(a, b)`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprMethodCall #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>receiver: Box<Expr>, |
| <span class="kw">pub </span>dot_token: <span class="macro">Token!</span>[.], |
| <span class="kw">pub </span>method: Ident, |
| <span class="kw">pub </span>turbofish: <span class="prelude-ty">Option</span><AngleBracketedGenericArguments>, |
| <span class="kw">pub </span>paren_token: token::Paren, |
| <span class="kw">pub </span>args: Punctuated<Expr, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A parenthesized expression: `(a + b)`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprParen { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>paren_token: token::Paren, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A path like `std::mem::replace` possibly containing generic |
| /// parameters and a qualified self-type. |
| /// |
| /// A plain identifier like `x` is a path of length 1. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprPath { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>qself: <span class="prelude-ty">Option</span><QSelf>, |
| <span class="kw">pub </span>path: Path, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprRange #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>start: <span class="prelude-ty">Option</span><Box<Expr>>, |
| <span class="kw">pub </span>limits: RangeLimits, |
| <span class="kw">pub </span>end: <span class="prelude-ty">Option</span><Box<Expr>>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A referencing operation: `&a` or `&mut a`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprReference #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>and_token: <span class="macro">Token!</span>[<span class="kw-2">&</span>], |
| <span class="kw">pub </span>mutability: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw-2">mut</span>]>, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An array literal constructed from one repeated element: `[0u8; N]`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprRepeat #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>bracket_token: token::Bracket, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>semi_token: <span class="macro">Token!</span>[;], |
| <span class="kw">pub </span>len: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A `return`, with an optional value to be returned. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprReturn #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>return_token: <span class="macro">Token!</span>[<span class="kw">return</span>], |
| <span class="kw">pub </span>expr: <span class="prelude-ty">Option</span><Box<Expr>>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A struct literal expression: `Point { x: 1, y: 1 }`. |
| /// |
| /// The `rest` provides the value of the remaining fields as in `S { a: |
| /// 1, b: 1, ..rest }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprStruct #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>qself: <span class="prelude-ty">Option</span><QSelf>, |
| <span class="kw">pub </span>path: Path, |
| <span class="kw">pub </span>brace_token: token::Brace, |
| <span class="kw">pub </span>fields: Punctuated<FieldValue, <span class="macro">Token!</span>[,]>, |
| <span class="kw">pub </span>dot2_token: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[..]>, |
| <span class="kw">pub </span>rest: <span class="prelude-ty">Option</span><Box<Expr>>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A try-expression: `expr?`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprTry #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| <span class="kw">pub </span>question_token: <span class="macro">Token!</span>[<span class="question-mark">?</span>], |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A try block: `try { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprTryBlock #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>try_token: <span class="macro">Token!</span>[<span class="kw">try</span>], |
| <span class="kw">pub </span>block: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A tuple expression: `(a, b, c, d)`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprTuple #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>paren_token: token::Paren, |
| <span class="kw">pub </span>elems: Punctuated<Expr, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A unary operation: `!x`, `*x`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>ExprUnary { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>op: UnOp, |
| <span class="kw">pub </span>expr: Box<Expr>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An unsafe block: `unsafe { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprUnsafe #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>unsafe_token: <span class="macro">Token!</span>[<span class="kw">unsafe</span>], |
| <span class="kw">pub </span>block: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A while loop: `while expr { ... }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprWhile #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>label: <span class="prelude-ty">Option</span><Label>, |
| <span class="kw">pub </span>while_token: <span class="macro">Token!</span>[<span class="kw">while</span>], |
| <span class="kw">pub </span>cond: Box<Expr>, |
| <span class="kw">pub </span>body: Block, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A yield expression: `yield expr`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>ExprYield #full { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>yield_token: <span class="macro">Token!</span>[<span class="kw">yield</span>], |
| <span class="kw">pub </span>expr: <span class="prelude-ty">Option</span><Box<Expr>>, |
| } |
| } |
| |
| <span class="kw">impl </span>Expr { |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">const </span>DUMMY: <span class="self">Self </span>= Expr::Path(ExprPath { |
| attrs: Vec::new(), |
| qself: <span class="prelude-val">None</span>, |
| path: Path { |
| leading_colon: <span class="prelude-val">None</span>, |
| segments: Punctuated::new(), |
| }, |
| }); |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"parsing"</span>, feature = <span class="string">"full"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>replace_attrs(<span class="kw-2">&mut </span><span class="self">self</span>, new: Vec<Attribute>) -> Vec<Attribute> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Expr::Array(ExprArray { attrs, .. }) |
| | Expr::Assign(ExprAssign { attrs, .. }) |
| | Expr::Async(ExprAsync { attrs, .. }) |
| | Expr::Await(ExprAwait { attrs, .. }) |
| | Expr::Binary(ExprBinary { attrs, .. }) |
| | Expr::Block(ExprBlock { attrs, .. }) |
| | Expr::Break(ExprBreak { attrs, .. }) |
| | Expr::Call(ExprCall { attrs, .. }) |
| | Expr::Cast(ExprCast { attrs, .. }) |
| | Expr::Closure(ExprClosure { attrs, .. }) |
| | Expr::Const(ExprConst { attrs, .. }) |
| | Expr::Continue(ExprContinue { attrs, .. }) |
| | Expr::Field(ExprField { attrs, .. }) |
| | Expr::ForLoop(ExprForLoop { attrs, .. }) |
| | Expr::Group(ExprGroup { attrs, .. }) |
| | Expr::If(ExprIf { attrs, .. }) |
| | Expr::Index(ExprIndex { attrs, .. }) |
| | Expr::Infer(ExprInfer { attrs, .. }) |
| | Expr::Let(ExprLet { attrs, .. }) |
| | Expr::Lit(ExprLit { attrs, .. }) |
| | Expr::Loop(ExprLoop { attrs, .. }) |
| | Expr::Macro(ExprMacro { attrs, .. }) |
| | Expr::Match(ExprMatch { attrs, .. }) |
| | Expr::MethodCall(ExprMethodCall { attrs, .. }) |
| | Expr::Paren(ExprParen { attrs, .. }) |
| | Expr::Path(ExprPath { attrs, .. }) |
| | Expr::Range(ExprRange { attrs, .. }) |
| | Expr::Reference(ExprReference { attrs, .. }) |
| | Expr::Repeat(ExprRepeat { attrs, .. }) |
| | Expr::Return(ExprReturn { attrs, .. }) |
| | Expr::Struct(ExprStruct { attrs, .. }) |
| | Expr::Try(ExprTry { attrs, .. }) |
| | Expr::TryBlock(ExprTryBlock { attrs, .. }) |
| | Expr::Tuple(ExprTuple { attrs, .. }) |
| | Expr::Unary(ExprUnary { attrs, .. }) |
| | Expr::Unsafe(ExprUnsafe { attrs, .. }) |
| | Expr::While(ExprWhile { attrs, .. }) |
| | Expr::Yield(ExprYield { attrs, .. }) => mem::replace(attrs, new), |
| Expr::Verbatim(<span class="kw">_</span>) => Vec::new(), |
| } |
| } |
| } |
| |
| <span class="macro">ast_enum! </span>{ |
| <span class="doccomment">/// A struct or tuple struct field accessed in a struct literal or field |
| /// expression. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub enum </span>Member { |
| <span class="doccomment">/// A named field like `self.x`. |
| </span>Named(Ident), |
| <span class="doccomment">/// An unnamed field like `self.0`. |
| </span>Unnamed(Index), |
| } |
| } |
| |
| <span class="kw">impl </span>From<Ident> <span class="kw">for </span>Member { |
| <span class="kw">fn </span>from(ident: Ident) -> Member { |
| Member::Named(ident) |
| } |
| } |
| |
| <span class="kw">impl </span>From<Index> <span class="kw">for </span>Member { |
| <span class="kw">fn </span>from(index: Index) -> Member { |
| Member::Unnamed(index) |
| } |
| } |
| |
| <span class="kw">impl </span>From<usize> <span class="kw">for </span>Member { |
| <span class="kw">fn </span>from(index: usize) -> Member { |
| Member::Unnamed(Index::from(index)) |
| } |
| } |
| |
| <span class="kw">impl </span>Eq <span class="kw">for </span>Member {} |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Member { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw">match </span>(<span class="self">self</span>, other) { |
| (Member::Named(this), Member::Named(other)) => this == other, |
| (Member::Unnamed(this), Member::Unnamed(other)) => this == other, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Member { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Member::Named(m) => m.hash(state), |
| Member::Unnamed(m) => m.hash(state), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">impl </span>IdentFragment <span class="kw">for </span>Member { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Member::Named(m) => Display::fmt(m, formatter), |
| Member::Unnamed(m) => Display::fmt(<span class="kw-2">&</span>m.index, formatter), |
| } |
| } |
| |
| <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Span> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Member::Named(m) => <span class="prelude-val">Some</span>(m.span()), |
| Member::Unnamed(m) => <span class="prelude-val">Some</span>(m.span), |
| } |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// The index of an unnamed tuple struct field. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>Index { |
| <span class="kw">pub </span>index: u32, |
| <span class="kw">pub </span>span: Span, |
| } |
| } |
| |
| <span class="kw">impl </span>From<usize> <span class="kw">for </span>Index { |
| <span class="kw">fn </span>from(index: usize) -> Index { |
| <span class="macro">assert!</span>(index < u32::max_value() <span class="kw">as </span>usize); |
| Index { |
| index: index <span class="kw">as </span>u32, |
| span: Span::call_site(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Eq <span class="kw">for </span>Index {} |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Index { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.index == other.index |
| } |
| } |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Index { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <span class="self">self</span>.index.hash(state); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">impl </span>IdentFragment <span class="kw">for </span>Index { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| Display::fmt(<span class="kw-2">&</span><span class="self">self</span>.index, formatter) |
| } |
| |
| <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Span> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.span) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A field-value pair in a struct literal. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>FieldValue { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>member: Member, |
| |
| <span class="doccomment">/// The colon in `Struct { x: x }`. If written in shorthand like |
| /// `Struct { x }`, there is no colon. |
| </span><span class="kw">pub </span>colon_token: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[:]>, |
| |
| <span class="kw">pub </span>expr: Expr, |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A lifetime labeling a `for`, `while`, or `loop`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>Label { |
| <span class="kw">pub </span>name: Lifetime, |
| <span class="kw">pub </span>colon_token: <span class="macro">Token!</span>[:], |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// One arm of a `match` expression: `0..=10 => { return true; }`. |
| /// |
| /// As in: |
| /// |
| /// ``` |
| /// # fn f() -> bool { |
| /// # let n = 0; |
| /// match n { |
| /// 0..=10 => { |
| /// return true; |
| /// } |
| /// // ... |
| /// # _ => {} |
| /// } |
| /// # false |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub struct </span>Arm { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| <span class="kw">pub </span>pat: Pat, |
| <span class="kw">pub </span>guard: <span class="prelude-ty">Option</span><(<span class="macro">Token!</span>[<span class="kw">if</span>], Box<Expr>)>, |
| <span class="kw">pub </span>fat_arrow_token: <span class="macro">Token!</span>[=>], |
| <span class="kw">pub </span>body: Box<Expr>, |
| <span class="kw">pub </span>comma: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="macro">ast_enum! </span>{ |
| <span class="doccomment">/// Limit types of a range, inclusive or exclusive. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"full"</span>)))] |
| </span><span class="kw">pub enum </span>RangeLimits { |
| <span class="doccomment">/// Inclusive at the beginning, exclusive at the end. |
| </span>HalfOpen(<span class="macro">Token!</span>[..]), |
| <span class="doccomment">/// Inclusive at the beginning and end. |
| </span>Closed(<span class="macro">Token!</span>[..=]), |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"parsing"</span>, feature = <span class="string">"printing"</span>))] |
| #[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>requires_terminator(expr: <span class="kw-2">&</span>Expr) -> bool { |
| <span class="comment">// see https://github.com/rust-lang/rust/blob/9a19e7604/compiler/rustc_ast/src/util/classify.rs#L7-L26 |
| </span><span class="kw">match </span>expr { |
| Expr::If(<span class="kw">_</span>) |
| | Expr::Match(<span class="kw">_</span>) |
| | Expr::Block(<span class="kw">_</span>) | Expr::Unsafe(<span class="kw">_</span>) <span class="comment">// both under ExprKind::Block in rustc |
| </span>| Expr::While(<span class="kw">_</span>) |
| | Expr::Loop(<span class="kw">_</span>) |
| | Expr::ForLoop(<span class="kw">_</span>) |
| | Expr::TryBlock(<span class="kw">_</span>) |
| | Expr::Const(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| Expr::Array(<span class="kw">_</span>) |
| | Expr::Assign(<span class="kw">_</span>) |
| | Expr::Async(<span class="kw">_</span>) |
| | Expr::Await(<span class="kw">_</span>) |
| | Expr::Binary(<span class="kw">_</span>) |
| | Expr::Break(<span class="kw">_</span>) |
| | Expr::Call(<span class="kw">_</span>) |
| | Expr::Cast(<span class="kw">_</span>) |
| | Expr::Closure(<span class="kw">_</span>) |
| | Expr::Continue(<span class="kw">_</span>) |
| | Expr::Field(<span class="kw">_</span>) |
| | Expr::Group(<span class="kw">_</span>) |
| | Expr::Index(<span class="kw">_</span>) |
| | Expr::Infer(<span class="kw">_</span>) |
| | Expr::Let(<span class="kw">_</span>) |
| | Expr::Lit(<span class="kw">_</span>) |
| | Expr::Macro(<span class="kw">_</span>) |
| | Expr::MethodCall(<span class="kw">_</span>) |
| | Expr::Paren(<span class="kw">_</span>) |
| | Expr::Path(<span class="kw">_</span>) |
| | Expr::Range(<span class="kw">_</span>) |
| | Expr::Reference(<span class="kw">_</span>) |
| | Expr::Repeat(<span class="kw">_</span>) |
| | Expr::Return(<span class="kw">_</span>) |
| | Expr::Struct(<span class="kw">_</span>) |
| | Expr::Try(<span class="kw">_</span>) |
| | Expr::Tuple(<span class="kw">_</span>) |
| | Expr::Unary(<span class="kw">_</span>) |
| | Expr::Yield(<span class="kw">_</span>) |
| | Expr::Verbatim(<span class="kw">_</span>) => <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>parsing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::discouraged::Speculative; |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::parse::ParseBuffer; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span><span class="kw">crate</span>::path; |
| <span class="kw">use </span>std::cmp::Ordering; |
| |
| <span class="kw">mod </span>kw { |
| <span class="macro">crate::custom_keyword!</span>(builtin); |
| <span class="macro">crate::custom_keyword!</span>(raw); |
| } |
| |
| <span class="comment">// When we're parsing expressions which occur before blocks, like in an if |
| // statement's condition, we cannot parse a struct literal. |
| // |
| // Struct literals are ambiguous in certain positions |
| // https://github.com/rust-lang/rfcs/pull/92 |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>AllowStruct(bool); |
| |
| <span class="kw">enum </span>Precedence { |
| Any, |
| Assign, |
| Range, |
| Or, |
| And, |
| Compare, |
| BitOr, |
| BitXor, |
| BitAnd, |
| Shift, |
| Arithmetic, |
| Term, |
| Cast, |
| } |
| |
| <span class="kw">impl </span>Precedence { |
| <span class="kw">fn </span>of(op: <span class="kw-2">&</span>BinOp) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>op { |
| BinOp::Add(<span class="kw">_</span>) | BinOp::Sub(<span class="kw">_</span>) => Precedence::Arithmetic, |
| BinOp::Mul(<span class="kw">_</span>) | BinOp::Div(<span class="kw">_</span>) | BinOp::Rem(<span class="kw">_</span>) => Precedence::Term, |
| BinOp::And(<span class="kw">_</span>) => Precedence::And, |
| BinOp::Or(<span class="kw">_</span>) => Precedence::Or, |
| BinOp::BitXor(<span class="kw">_</span>) => Precedence::BitXor, |
| BinOp::BitAnd(<span class="kw">_</span>) => Precedence::BitAnd, |
| BinOp::BitOr(<span class="kw">_</span>) => Precedence::BitOr, |
| BinOp::Shl(<span class="kw">_</span>) | BinOp::Shr(<span class="kw">_</span>) => Precedence::Shift, |
| BinOp::Eq(<span class="kw">_</span>) |
| | BinOp::Lt(<span class="kw">_</span>) |
| | BinOp::Le(<span class="kw">_</span>) |
| | BinOp::Ne(<span class="kw">_</span>) |
| | BinOp::Ge(<span class="kw">_</span>) |
| | BinOp::Gt(<span class="kw">_</span>) => Precedence::Compare, |
| BinOp::AddAssign(<span class="kw">_</span>) |
| | BinOp::SubAssign(<span class="kw">_</span>) |
| | BinOp::MulAssign(<span class="kw">_</span>) |
| | BinOp::DivAssign(<span class="kw">_</span>) |
| | BinOp::RemAssign(<span class="kw">_</span>) |
| | BinOp::BitXorAssign(<span class="kw">_</span>) |
| | BinOp::BitAndAssign(<span class="kw">_</span>) |
| | BinOp::BitOrAssign(<span class="kw">_</span>) |
| | BinOp::ShlAssign(<span class="kw">_</span>) |
| | BinOp::ShrAssign(<span class="kw">_</span>) => Precedence::Assign, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Expr { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| ambiguous_expr( |
| input, |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span>AllowStruct(<span class="bool-val">true</span>), |
| ) |
| } |
| } |
| |
| <span class="kw">impl </span>Expr { |
| <span class="doccomment">/// An alternative to the primary `Expr::parse` parser (from the |
| /// [`Parse`] trait) for ambiguous syntactic positions in which a |
| /// trailing brace should not be taken as part of the expression. |
| /// |
| /// Rust grammar has an ambiguity where braces sometimes turn a path |
| /// expression into a struct initialization and sometimes do not. In the |
| /// following code, the expression `S {}` is one expression. Presumably |
| /// there is an empty struct `struct S {}` defined somewhere which it is |
| /// instantiating. |
| /// |
| /// ``` |
| /// # struct S; |
| /// # impl std::ops::Deref for S { |
| /// # type Target = bool; |
| /// # fn deref(&self) -> &Self::Target { |
| /// # &true |
| /// # } |
| /// # } |
| /// let _ = *S {}; |
| /// |
| /// // parsed by rustc as: `*(S {})` |
| /// ``` |
| /// |
| /// We would want to parse the above using `Expr::parse` after the `=` |
| /// token. |
| /// |
| /// But in the following, `S {}` is *not* a struct init expression. |
| /// |
| /// ``` |
| /// # const S: &bool = &true; |
| /// if *S {} {} |
| /// |
| /// // parsed by rustc as: |
| /// // |
| /// // if (*S) { |
| /// // /* empty block */ |
| /// // } |
| /// // { |
| /// // /* another empty block */ |
| /// // } |
| /// ``` |
| /// |
| /// For that reason we would want to parse if-conditions using |
| /// `Expr::parse_without_eager_brace` after the `if` token. Same for |
| /// similar syntactic positions such as the condition expr after a |
| /// `while` token or the expr at the top of a `match`. |
| /// |
| /// The Rust grammar's choices around which way this ambiguity is |
| /// resolved at various syntactic positions is fairly arbitrary. Really |
| /// either parse behavior could work in most positions, and language |
| /// designers just decide each case based on which is more likely to be |
| /// what the programmer had in mind most of the time. |
| /// |
| /// ``` |
| /// # struct S; |
| /// # fn doc() -> S { |
| /// if return S {} {} |
| /// # unreachable!() |
| /// # } |
| /// |
| /// // parsed by rustc as: |
| /// // |
| /// // if (return (S {})) { |
| /// // } |
| /// // |
| /// // but could equally well have been this other arbitrary choice: |
| /// // |
| /// // if (return S) { |
| /// // } |
| /// // {} |
| /// ``` |
| /// |
| /// Note the grammar ambiguity on trailing braces is distinct from |
| /// precedence and is not captured by assigning a precedence level to |
| /// the braced struct init expr in relation to other operators. This can |
| /// be illustrated by `return 0..S {}` vs `match 0..S {}`. The former |
| /// parses as `return (0..(S {}))` implying tighter precedence for |
| /// struct init than `..`, while the latter parses as `match (0..S) {}` |
| /// implying tighter precedence for `..` than struct init, a |
| /// contradiction. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(all(feature = <span class="string">"full"</span>, feature = <span class="string">"parsing"</span>))))] |
| </span><span class="kw">pub fn </span>parse_without_eager_brace(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| ambiguous_expr(input, AllowStruct(<span class="bool-val">false</span>)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">impl </span>Copy <span class="kw">for </span>AllowStruct {} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span>AllowStruct { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw-2">*</span><span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl </span>Copy <span class="kw">for </span>Precedence {} |
| |
| <span class="kw">impl </span>Clone <span class="kw">for </span>Precedence { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw-2">*</span><span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Precedence { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8 == <span class="kw-2">*</span>other <span class="kw">as </span>u8 |
| } |
| } |
| |
| <span class="kw">impl </span>PartialOrd <span class="kw">for </span>Precedence { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><Ordering> { |
| <span class="kw">let </span>this = <span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8; |
| <span class="kw">let </span>other = <span class="kw-2">*</span>other <span class="kw">as </span>u8; |
| <span class="prelude-val">Some</span>(this.cmp(<span class="kw-2">&</span>other)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>parse_expr( |
| input: ParseStream, |
| <span class="kw-2">mut </span>lhs: Expr, |
| allow_struct: AllowStruct, |
| base: Precedence, |
| ) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>ahead = input.fork(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(op) = <span class="kw">match </span>ahead.parse::<BinOp>() { |
| <span class="prelude-val">Ok</span>(op) <span class="kw">if </span>Precedence::of(<span class="kw-2">&</span>op) >= base => <span class="prelude-val">Some</span>(op), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } { |
| input.advance_to(<span class="kw-2">&</span>ahead); |
| <span class="kw">let </span>precedence = Precedence::of(<span class="kw-2">&</span>op); |
| <span class="kw">let </span><span class="kw-2">mut </span>rhs = unary_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>next = peek_precedence(input); |
| <span class="kw">if </span>next > precedence || next == precedence && precedence == Precedence::Assign { |
| rhs = parse_expr(input, rhs, allow_struct, next)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| lhs = Expr::Binary(ExprBinary { |
| attrs: Vec::new(), |
| left: Box::new(lhs), |
| op, |
| right: Box::new(rhs), |
| }); |
| } <span class="kw">else if </span>Precedence::Assign >= base |
| && input.peek(<span class="macro">Token!</span>[=]) |
| && !input.peek(<span class="macro">Token!</span>[==]) |
| && !input.peek(<span class="macro">Token!</span>[=>]) |
| { |
| <span class="kw">let </span>eq_token: <span class="macro">Token!</span>[=] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>rhs = unary_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>next = peek_precedence(input); |
| <span class="kw">if </span>next >= Precedence::Assign { |
| rhs = parse_expr(input, rhs, allow_struct, next)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| lhs = Expr::Assign(ExprAssign { |
| attrs: Vec::new(), |
| left: Box::new(lhs), |
| eq_token, |
| right: Box::new(rhs), |
| }); |
| } <span class="kw">else if </span>Precedence::Range >= base && input.peek(<span class="macro">Token!</span>[..]) { |
| <span class="kw">let </span>limits: RangeLimits = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>rhs = <span class="kw">if </span><span class="macro">matches!</span>(limits, RangeLimits::HalfOpen(<span class="kw">_</span>)) |
| && (input.is_empty() |
| || input.peek(<span class="macro">Token!</span>[,]) |
| || input.peek(<span class="macro">Token!</span>[;]) |
| || input.peek(<span class="macro">Token!</span>[.]) && !input.peek(<span class="macro">Token!</span>[..]) |
| || !allow_struct.<span class="number">0 </span>&& input.peek(token::Brace)) |
| { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>rhs = unary_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>next = peek_precedence(input); |
| <span class="kw">if </span>next > Precedence::Range { |
| rhs = parse_expr(input, rhs, allow_struct, next)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Some</span>(rhs) |
| }; |
| lhs = Expr::Range(ExprRange { |
| attrs: Vec::new(), |
| start: <span class="prelude-val">Some</span>(Box::new(lhs)), |
| limits, |
| end: rhs.map(Box::new), |
| }); |
| } <span class="kw">else if </span>Precedence::Cast >= base && input.peek(<span class="macro">Token!</span>[<span class="kw">as</span>]) { |
| <span class="kw">let </span>as_token: <span class="macro">Token!</span>[<span class="kw">as</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>allow_plus = <span class="bool-val">false</span>; |
| <span class="kw">let </span>allow_group_generic = <span class="bool-val">false</span>; |
| <span class="kw">let </span>ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)<span class="question-mark">?</span>; |
| check_cast(input)<span class="question-mark">?</span>; |
| lhs = Expr::Cast(ExprCast { |
| attrs: Vec::new(), |
| expr: Box::new(lhs), |
| as_token, |
| ty: Box::new(ty), |
| }); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(lhs) |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">fn </span>parse_expr(input: ParseStream, <span class="kw-2">mut </span>lhs: Expr, base: Precedence) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>ahead = input.fork(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(op) = <span class="kw">match </span>ahead.parse::<BinOp>() { |
| <span class="prelude-val">Ok</span>(op) <span class="kw">if </span>Precedence::of(<span class="kw-2">&</span>op) >= base => <span class="prelude-val">Some</span>(op), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } { |
| input.advance_to(<span class="kw-2">&</span>ahead); |
| <span class="kw">let </span>precedence = Precedence::of(<span class="kw-2">&</span>op); |
| <span class="kw">let </span><span class="kw-2">mut </span>rhs = unary_expr(input)<span class="question-mark">?</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>next = peek_precedence(input); |
| <span class="kw">if </span>next > precedence || next == precedence && precedence == Precedence::Assign { |
| rhs = parse_expr(input, rhs, next)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| lhs = Expr::Binary(ExprBinary { |
| attrs: Vec::new(), |
| left: Box::new(lhs), |
| op, |
| right: Box::new(rhs), |
| }); |
| } <span class="kw">else if </span>Precedence::Cast >= base && input.peek(<span class="macro">Token!</span>[<span class="kw">as</span>]) { |
| <span class="kw">let </span>as_token: <span class="macro">Token!</span>[<span class="kw">as</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>allow_plus = <span class="bool-val">false</span>; |
| <span class="kw">let </span>allow_group_generic = <span class="bool-val">false</span>; |
| <span class="kw">let </span>ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)<span class="question-mark">?</span>; |
| check_cast(input)<span class="question-mark">?</span>; |
| lhs = Expr::Cast(ExprCast { |
| attrs: Vec::new(), |
| expr: Box::new(lhs), |
| as_token, |
| ty: Box::new(ty), |
| }); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(lhs) |
| } |
| |
| <span class="kw">fn </span>peek_precedence(input: ParseStream) -> Precedence { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(op) = input.fork().parse() { |
| Precedence::of(<span class="kw-2">&</span>op) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[=]) && !input.peek(<span class="macro">Token!</span>[=>]) { |
| Precedence::Assign |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[..]) { |
| Precedence::Range |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">as</span>]) { |
| Precedence::Cast |
| } <span class="kw">else </span>{ |
| Precedence::Any |
| } |
| } |
| |
| <span class="comment">// Parse an arbitrary expression. |
| </span><span class="kw">fn </span>ambiguous_expr( |
| input: ParseStream, |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] </span>allow_struct: AllowStruct, |
| ) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>lhs = unary_expr( |
| input, |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span>allow_struct, |
| )<span class="question-mark">?</span>; |
| parse_expr( |
| input, |
| lhs, |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span>allow_struct, |
| Precedence::Any, |
| ) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_attrs(input: ParseStream) -> <span class="prelude-ty">Result</span><Vec<Attribute>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = Vec::new(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>input.peek(token::Group) { |
| <span class="kw">let </span>ahead = input.fork(); |
| <span class="kw">let </span>group = <span class="kw">crate</span>::group::parse_group(<span class="kw-2">&</span>ahead)<span class="question-mark">?</span>; |
| <span class="kw">if </span>!group.content.peek(<span class="macro">Token!</span>[#]) || group.content.peek2(<span class="macro">Token!</span>[!]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>attr = group.content.call(attr::parsing::single_parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">if </span>!group.content.is_empty() { |
| <span class="kw">break</span>; |
| } |
| attrs.push(attr); |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[#]) { |
| attrs.push(input.call(attr::parsing::single_parse_outer)<span class="question-mark">?</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(attrs) |
| } |
| |
| <span class="comment">// <UnOp> <trailer> |
| // & <trailer> |
| // &mut <trailer> |
| // box <trailer> |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>unary_expr(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>begin = input.fork(); |
| <span class="kw">let </span>attrs = input.call(expr_attrs)<span class="question-mark">?</span>; |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw-2">&</span>]) { |
| <span class="kw">let </span>and_token: <span class="macro">Token!</span>[<span class="kw-2">&</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>raw: <span class="prelude-ty">Option</span><kw::raw> = <span class="kw">if </span>input.peek(kw::raw) |
| && (input.peek2(<span class="macro">Token!</span>[<span class="kw-2">mut</span>]) || input.peek2(<span class="macro">Token!</span>[<span class="kw">const</span>])) |
| { |
| <span class="prelude-val">Some</span>(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| <span class="kw">let </span>mutability: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw-2">mut</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if </span>raw.is_some() && mutability.is_none() { |
| input.parse::<<span class="macro">Token!</span>[<span class="kw">const</span>]>()<span class="question-mark">?</span>; |
| } |
| <span class="kw">let </span>expr = Box::new(unary_expr(input, allow_struct)<span class="question-mark">?</span>); |
| <span class="kw">if </span>raw.is_some() { |
| <span class="prelude-val">Ok</span>(Expr::Verbatim(verbatim::between(begin, input))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(Expr::Reference(ExprReference { |
| attrs, |
| and_token, |
| mutability, |
| expr, |
| })) |
| } |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw-2">*</span>]) || input.peek(<span class="macro">Token!</span>[!]) || input.peek(<span class="macro">Token!</span>[-]) { |
| expr_unary(input, attrs, allow_struct).map(Expr::Unary) |
| } <span class="kw">else </span>{ |
| trailer_expr(begin, attrs, input, allow_struct) |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">fn </span>unary_expr(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw-2">*</span>]) || input.peek(<span class="macro">Token!</span>[!]) || input.peek(<span class="macro">Token!</span>[-]) { |
| <span class="prelude-val">Ok</span>(Expr::Unary(ExprUnary { |
| attrs: Vec::new(), |
| op: input.parse()<span class="question-mark">?</span>, |
| expr: Box::new(unary_expr(input)<span class="question-mark">?</span>), |
| })) |
| } <span class="kw">else </span>{ |
| trailer_expr(input) |
| } |
| } |
| |
| <span class="comment">// <atom> (..<args>) ... |
| // <atom> . <ident> (..<args>) ... |
| // <atom> . <ident> ... |
| // <atom> . <lit> ... |
| // <atom> [ <expr> ] ... |
| // <atom> ? ... |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>trailer_expr( |
| begin: ParseBuffer, |
| <span class="kw-2">mut </span>attrs: Vec<Attribute>, |
| input: ParseStream, |
| allow_struct: AllowStruct, |
| ) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>atom = atom_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>e = trailer_helper(input, atom)<span class="question-mark">?</span>; |
| |
| <span class="kw">if let </span>Expr::Verbatim(tokens) = <span class="kw-2">&mut </span>e { |
| <span class="kw-2">*</span>tokens = verbatim::between(begin, input); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>inner_attrs = e.replace_attrs(Vec::new()); |
| attrs.extend(inner_attrs); |
| e.replace_attrs(attrs); |
| } |
| |
| <span class="prelude-val">Ok</span>(e) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>trailer_helper(input: ParseStream, <span class="kw-2">mut </span>e: Expr) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>input.peek(token::Paren) { |
| <span class="kw">let </span>content; |
| e = Expr::Call(ExprCall { |
| attrs: Vec::new(), |
| func: Box::new(e), |
| paren_token: <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input), |
| args: content.parse_terminated(Expr::parse, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[.]) |
| && !input.peek(<span class="macro">Token!</span>[..]) |
| && <span class="kw">match </span>e { |
| Expr::Range(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">true</span>, |
| } |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>dot_token: <span class="macro">Token!</span>[.] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>float_token: <span class="prelude-ty">Option</span><LitFloat> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(float_token) = float_token { |
| <span class="kw">if </span>multi_index(<span class="kw-2">&mut </span>e, <span class="kw-2">&mut </span>dot_token, float_token)<span class="question-mark">? </span>{ |
| <span class="kw">continue</span>; |
| } |
| } |
| |
| <span class="kw">let </span>await_token: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">await</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(await_token) = await_token { |
| e = Expr::Await(ExprAwait { |
| attrs: Vec::new(), |
| base: Box::new(e), |
| dot_token, |
| await_token, |
| }); |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">let </span>member: Member = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>turbofish = <span class="kw">if </span>member.is_named() && input.peek(<span class="macro">Token!</span>[::]) { |
| <span class="prelude-val">Some</span>(AngleBracketedGenericArguments::parse_turbofish(input)<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| |
| <span class="kw">if </span>turbofish.is_some() || input.peek(token::Paren) { |
| <span class="kw">if let </span>Member::Named(method) = member { |
| <span class="kw">let </span>content; |
| e = Expr::MethodCall(ExprMethodCall { |
| attrs: Vec::new(), |
| receiver: Box::new(e), |
| dot_token, |
| method, |
| turbofish, |
| paren_token: <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input), |
| args: content.parse_terminated(Expr::parse, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }); |
| <span class="kw">continue</span>; |
| } |
| } |
| |
| e = Expr::Field(ExprField { |
| attrs: Vec::new(), |
| base: Box::new(e), |
| dot_token, |
| member, |
| }); |
| } <span class="kw">else if </span>input.peek(token::Bracket) { |
| <span class="kw">let </span>content; |
| e = Expr::Index(ExprIndex { |
| attrs: Vec::new(), |
| expr: Box::new(e), |
| bracket_token: <span class="macro">bracketed!</span>(content <span class="kw">in </span>input), |
| index: content.parse()<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="question-mark">?</span>]) { |
| e = Expr::Try(ExprTry { |
| attrs: Vec::new(), |
| expr: Box::new(e), |
| question_token: input.parse()<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(e) |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">fn </span>trailer_expr(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = atom_expr(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>input.peek(token::Paren) { |
| <span class="kw">let </span>content; |
| e = Expr::Call(ExprCall { |
| attrs: Vec::new(), |
| func: Box::new(e), |
| paren_token: <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input), |
| args: content.parse_terminated(Expr::parse, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[.]) |
| && !input.peek(<span class="macro">Token!</span>[..]) |
| && !input.peek2(<span class="macro">Token!</span>[<span class="kw">await</span>]) |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>dot_token: <span class="macro">Token!</span>[.] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>float_token: <span class="prelude-ty">Option</span><LitFloat> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(float_token) = float_token { |
| <span class="kw">if </span>multi_index(<span class="kw-2">&mut </span>e, <span class="kw-2">&mut </span>dot_token, float_token)<span class="question-mark">? </span>{ |
| <span class="kw">continue</span>; |
| } |
| } |
| e = Expr::Field(ExprField { |
| attrs: Vec::new(), |
| base: Box::new(e), |
| dot_token, |
| member: input.parse()<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else if </span>input.peek(token::Bracket) { |
| <span class="kw">let </span>content; |
| e = Expr::Index(ExprIndex { |
| attrs: Vec::new(), |
| expr: Box::new(e), |
| bracket_token: <span class="macro">bracketed!</span>(content <span class="kw">in </span>input), |
| index: content.parse()<span class="question-mark">?</span>, |
| }); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(e) |
| } |
| |
| <span class="comment">// Parse all atomic expressions which don't have to worry about precedence |
| // interactions, as they are fully contained. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>atom_expr(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">if </span>input.peek(token::Group) |
| && !input.peek2(<span class="macro">Token!</span>[::]) |
| && !input.peek2(<span class="macro">Token!</span>[!]) |
| && !input.peek2(token::Brace) |
| { |
| input.call(expr_group).map(Expr::Group) |
| } <span class="kw">else if </span>input.peek(Lit) { |
| input.parse().map(Expr::Lit) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">async</span>]) |
| && (input.peek2(token::Brace) || input.peek2(<span class="macro">Token!</span>[<span class="kw">move</span>]) && input.peek3(token::Brace)) |
| { |
| input.parse().map(Expr::Async) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">try</span>]) && input.peek2(token::Brace) { |
| input.parse().map(Expr::TryBlock) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[|]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">move</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">for</span>]) |
| && input.peek2(<span class="macro">Token!</span>[<]) |
| && (input.peek3(Lifetime) || input.peek3(<span class="macro">Token!</span>[>])) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">const</span>]) && !input.peek2(token::Brace) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">static</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">async</span>]) && (input.peek2(<span class="macro">Token!</span>[|]) || input.peek2(<span class="macro">Token!</span>[<span class="kw">move</span>])) |
| { |
| expr_closure(input, allow_struct).map(Expr::Closure) |
| } <span class="kw">else if </span>input.peek(kw::builtin) && input.peek2(<span class="macro">Token!</span>[#]) { |
| expr_builtin(input) |
| } <span class="kw">else if </span>input.peek(Ident) |
| || input.peek(<span class="macro">Token!</span>[::]) |
| || input.peek(<span class="macro">Token!</span>[<]) |
| || input.peek(<span class="macro">Token!</span>[<span class="self">self</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="self">Self</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">super</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">crate</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">try</span>]) && (input.peek2(<span class="macro">Token!</span>[!]) || input.peek2(<span class="macro">Token!</span>[::])) |
| { |
| path_or_macro_or_struct(input, allow_struct) |
| } <span class="kw">else if </span>input.peek(token::Paren) { |
| paren_or_tuple(input) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">break</span>]) { |
| expr_break(input, allow_struct).map(Expr::Break) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">continue</span>]) { |
| input.parse().map(Expr::Continue) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">return</span>]) { |
| expr_ret(input, allow_struct).map(Expr::Return) |
| } <span class="kw">else if </span>input.peek(token::Bracket) { |
| array_or_repeat(input) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">let</span>]) { |
| input.parse().map(Expr::Let) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">if</span>]) { |
| input.parse().map(Expr::If) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">while</span>]) { |
| input.parse().map(Expr::While) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">for</span>]) { |
| input.parse().map(Expr::ForLoop) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">loop</span>]) { |
| input.parse().map(Expr::Loop) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">match</span>]) { |
| input.parse().map(Expr::Match) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">yield</span>]) { |
| input.parse().map(Expr::Yield) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">unsafe</span>]) { |
| input.parse().map(Expr::Unsafe) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">const</span>]) { |
| input.parse().map(Expr::Const) |
| } <span class="kw">else if </span>input.peek(token::Brace) { |
| input.parse().map(Expr::Block) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[..]) { |
| expr_range(input, allow_struct).map(Expr::Range) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">_</span>]) { |
| input.parse().map(Expr::Infer) |
| } <span class="kw">else if </span>input.peek(Lifetime) { |
| <span class="kw">let </span>the_label: Label = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>expr = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">while</span>]) { |
| Expr::While(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">for</span>]) { |
| Expr::ForLoop(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">loop</span>]) { |
| Expr::Loop(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(token::Brace) { |
| Expr::Block(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(input.error(<span class="string">"expected loop or block expression"</span>)); |
| }; |
| <span class="kw">match </span><span class="kw-2">&mut </span>expr { |
| Expr::While(ExprWhile { label, .. }) |
| | Expr::ForLoop(ExprForLoop { label, .. }) |
| | Expr::Loop(ExprLoop { label, .. }) |
| | Expr::Block(ExprBlock { label, .. }) => <span class="kw-2">*</span>label = <span class="prelude-val">Some</span>(the_label), |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| <span class="prelude-val">Ok</span>(expr) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(input.error(<span class="string">"expected expression"</span>)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">fn </span>atom_expr(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">if </span>input.peek(token::Group) |
| && !input.peek2(<span class="macro">Token!</span>[::]) |
| && !input.peek2(<span class="macro">Token!</span>[!]) |
| && !input.peek2(token::Brace) |
| { |
| input.call(expr_group).map(Expr::Group) |
| } <span class="kw">else if </span>input.peek(Lit) { |
| input.parse().map(Expr::Lit) |
| } <span class="kw">else if </span>input.peek(token::Paren) { |
| input.call(expr_paren).map(Expr::Paren) |
| } <span class="kw">else if </span>input.peek(Ident) |
| || input.peek(<span class="macro">Token!</span>[::]) |
| || input.peek(<span class="macro">Token!</span>[<]) |
| || input.peek(<span class="macro">Token!</span>[<span class="self">self</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="self">Self</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">super</span>]) |
| || input.peek(<span class="macro">Token!</span>[<span class="kw">crate</span>]) |
| { |
| path_or_macro_or_struct(input) |
| } <span class="kw">else if </span>input.is_empty() { |
| <span class="prelude-val">Err</span>(input.error(<span class="string">"expected an expression"</span>)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(input.error(<span class="string">"unsupported expression; enable syn's features=[\"full\"]"</span>)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_builtin(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>begin = input.fork(); |
| |
| input.parse::<kw::builtin>()<span class="question-mark">?</span>; |
| input.parse::<<span class="macro">Token!</span>[#]>()<span class="question-mark">?</span>; |
| input.parse::<Ident>()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>args; |
| <span class="macro">parenthesized!</span>(args <span class="kw">in </span>input); |
| args.parse::<TokenStream>()<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(Expr::Verbatim(verbatim::between(begin, input))) |
| } |
| |
| <span class="kw">fn </span>path_or_macro_or_struct( |
| input: ParseStream, |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] </span>allow_struct: AllowStruct, |
| ) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>(qself, path) = path::parsing::qpath(input, <span class="bool-val">true</span>)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>qself.is_none() |
| && input.peek(<span class="macro">Token!</span>[!]) |
| && !input.peek(<span class="macro">Token!</span>[!=]) |
| && path.is_mod_style() |
| { |
| <span class="kw">let </span>bang_token: <span class="macro">Token!</span>[!] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>(delimiter, tokens) = mac::parse_delimiter(input)<span class="question-mark">?</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Expr::Macro(ExprMacro { |
| attrs: Vec::new(), |
| mac: Macro { |
| path, |
| bang_token, |
| delimiter, |
| tokens, |
| }, |
| })); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">if </span>allow_struct.<span class="number">0 </span>&& input.peek(token::Brace) { |
| <span class="kw">return </span>expr_struct_helper(input, qself, path).map(Expr::Struct); |
| } |
| |
| <span class="prelude-val">Ok</span>(Expr::Path(ExprPath { |
| attrs: Vec::new(), |
| qself, |
| path, |
| })) |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprMacro { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprMacro { |
| attrs: Vec::new(), |
| mac: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>paren_or_tuple(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>paren_token = <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Expr::Tuple(ExprTuple { |
| attrs: Vec::new(), |
| paren_token, |
| elems: Punctuated::new(), |
| })); |
| } |
| |
| <span class="kw">let </span>first: Expr = content.parse()<span class="question-mark">?</span>; |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Expr::Paren(ExprParen { |
| attrs: Vec::new(), |
| paren_token, |
| expr: Box::new(first), |
| })); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>elems = Punctuated::new(); |
| elems.push_value(first); |
| <span class="kw">while </span>!content.is_empty() { |
| <span class="kw">let </span>punct = content.parse()<span class="question-mark">?</span>; |
| elems.push_punct(punct); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>value = content.parse()<span class="question-mark">?</span>; |
| elems.push_value(value); |
| } |
| <span class="prelude-val">Ok</span>(Expr::Tuple(ExprTuple { |
| attrs: Vec::new(), |
| paren_token, |
| elems, |
| })) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>array_or_repeat(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>bracket_token = <span class="macro">bracketed!</span>(content <span class="kw">in </span>input); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Expr::Array(ExprArray { |
| attrs: Vec::new(), |
| bracket_token, |
| elems: Punctuated::new(), |
| })); |
| } |
| |
| <span class="kw">let </span>first: Expr = content.parse()<span class="question-mark">?</span>; |
| <span class="kw">if </span>content.is_empty() || content.peek(<span class="macro">Token!</span>[,]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>elems = Punctuated::new(); |
| elems.push_value(first); |
| <span class="kw">while </span>!content.is_empty() { |
| <span class="kw">let </span>punct = content.parse()<span class="question-mark">?</span>; |
| elems.push_punct(punct); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>value = content.parse()<span class="question-mark">?</span>; |
| elems.push_value(value); |
| } |
| <span class="prelude-val">Ok</span>(Expr::Array(ExprArray { |
| attrs: Vec::new(), |
| bracket_token, |
| elems, |
| })) |
| } <span class="kw">else if </span>content.peek(<span class="macro">Token!</span>[;]) { |
| <span class="kw">let </span>semi_token: <span class="macro">Token!</span>[;] = content.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>len: Expr = content.parse()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Expr::Repeat(ExprRepeat { |
| attrs: Vec::new(), |
| bracket_token, |
| expr: Box::new(first), |
| semi_token, |
| len: Box::new(len), |
| })) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(content.error(<span class="string">"expected `,` or `;`"</span>)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprArray { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>bracket_token = <span class="macro">bracketed!</span>(content <span class="kw">in </span>input); |
| <span class="kw">let </span><span class="kw-2">mut </span>elems = Punctuated::new(); |
| |
| <span class="kw">while </span>!content.is_empty() { |
| <span class="kw">let </span>first: Expr = content.parse()<span class="question-mark">?</span>; |
| elems.push_value(first); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>punct = content.parse()<span class="question-mark">?</span>; |
| elems.push_punct(punct); |
| } |
| |
| <span class="prelude-val">Ok</span>(ExprArray { |
| attrs: Vec::new(), |
| bracket_token, |
| elems, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprRepeat { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>content; |
| <span class="prelude-val">Ok</span>(ExprRepeat { |
| bracket_token: <span class="macro">bracketed!</span>(content <span class="kw">in </span>input), |
| attrs: Vec::new(), |
| expr: content.parse()<span class="question-mark">?</span>, |
| semi_token: content.parse()<span class="question-mark">?</span>, |
| len: content.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>expr_early(input: ParseStream) -> <span class="prelude-ty">Result</span><Expr> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(expr_attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>expr = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">if</span>]) { |
| Expr::If(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">while</span>]) { |
| Expr::While(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">for</span>]) |
| && !(input.peek2(<span class="macro">Token!</span>[<]) && (input.peek3(Lifetime) || input.peek3(<span class="macro">Token!</span>[>]))) |
| { |
| Expr::ForLoop(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">loop</span>]) { |
| Expr::Loop(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">match</span>]) { |
| Expr::Match(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">try</span>]) && input.peek2(token::Brace) { |
| Expr::TryBlock(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">unsafe</span>]) { |
| Expr::Unsafe(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">const</span>]) && input.peek2(token::Brace) { |
| Expr::Const(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(token::Brace) { |
| Expr::Block(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>expr = unary_expr(input, allow_struct)<span class="question-mark">?</span>; |
| |
| attrs.extend(expr.replace_attrs(Vec::new())); |
| expr.replace_attrs(attrs); |
| |
| <span class="kw">return </span>parse_expr(input, expr, allow_struct, Precedence::Any); |
| }; |
| |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[.]) && !input.peek(<span class="macro">Token!</span>[..]) || input.peek(<span class="macro">Token!</span>[<span class="question-mark">?</span>]) { |
| expr = trailer_helper(input, expr)<span class="question-mark">?</span>; |
| |
| attrs.extend(expr.replace_attrs(Vec::new())); |
| expr.replace_attrs(attrs); |
| |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| <span class="kw">return </span>parse_expr(input, expr, allow_struct, Precedence::Any); |
| } |
| |
| attrs.extend(expr.replace_attrs(Vec::new())); |
| expr.replace_attrs(attrs); |
| <span class="prelude-val">Ok</span>(expr) |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprLit { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprLit { |
| attrs: Vec::new(), |
| lit: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="kw">fn </span>expr_group(input: ParseStream) -> <span class="prelude-ty">Result</span><ExprGroup> { |
| <span class="kw">let </span>group = <span class="kw">crate</span>::group::parse_group(input)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(ExprGroup { |
| attrs: Vec::new(), |
| group_token: group.token, |
| expr: group.content.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprParen { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| expr_paren(input) |
| } |
| } |
| |
| <span class="kw">fn </span>expr_paren(input: ParseStream) -> <span class="prelude-ty">Result</span><ExprParen> { |
| <span class="kw">let </span>content; |
| <span class="prelude-val">Ok</span>(ExprParen { |
| attrs: Vec::new(), |
| paren_token: <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input), |
| expr: content.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprLet { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprLet { |
| attrs: Vec::new(), |
| let_token: input.parse()<span class="question-mark">?</span>, |
| pat: Box::new(Pat::parse_multi_with_leading_vert(input)<span class="question-mark">?</span>), |
| eq_token: input.parse()<span class="question-mark">?</span>, |
| expr: Box::new({ |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">false</span>); |
| <span class="kw">let </span>lhs = unary_expr(input, allow_struct)<span class="question-mark">?</span>; |
| parse_expr(input, lhs, allow_struct, Precedence::Compare)<span class="question-mark">? |
| </span>}), |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprIf { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(ExprIf { |
| attrs, |
| if_token: input.parse()<span class="question-mark">?</span>, |
| cond: Box::new(input.call(Expr::parse_without_eager_brace)<span class="question-mark">?</span>), |
| then_branch: input.parse()<span class="question-mark">?</span>, |
| else_branch: { |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">else</span>]) { |
| <span class="prelude-val">Some</span>(input.call(else_block)<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>else_block(input: ParseStream) -> <span class="prelude-ty">Result</span><(<span class="macro">Token!</span>[<span class="kw">else</span>], Box<Expr>)> { |
| <span class="kw">let </span>else_token: <span class="macro">Token!</span>[<span class="kw">else</span>] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>lookahead = input.lookahead1(); |
| <span class="kw">let </span>else_branch = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">if</span>]) { |
| input.parse().map(Expr::If)<span class="question-mark">? |
| </span>} <span class="kw">else if </span>input.peek(token::Brace) { |
| Expr::Block(ExprBlock { |
| attrs: Vec::new(), |
| label: <span class="prelude-val">None</span>, |
| block: input.parse()<span class="question-mark">?</span>, |
| }) |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(lookahead.error()); |
| }; |
| |
| <span class="prelude-val">Ok</span>((else_token, Box::new(else_branch))) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprInfer { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprInfer { |
| attrs: input.call(Attribute::parse_outer)<span class="question-mark">?</span>, |
| underscore_token: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprForLoop { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>label: <span class="prelude-ty">Option</span><Label> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>for_token: <span class="macro">Token!</span>[<span class="kw">for</span>] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>pat = Pat::parse_multi_with_leading_vert(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>in_token: <span class="macro">Token!</span>[<span class="kw">in</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>expr: Expr = input.call(Expr::parse_without_eager_brace)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| attr::parsing::parse_inner(<span class="kw-2">&</span>content, <span class="kw-2">&mut </span>attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprForLoop { |
| attrs, |
| label, |
| for_token, |
| pat: Box::new(pat), |
| in_token, |
| expr: Box::new(expr), |
| body: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprLoop { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>label: <span class="prelude-ty">Option</span><Label> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>loop_token: <span class="macro">Token!</span>[<span class="kw">loop</span>] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| attr::parsing::parse_inner(<span class="kw-2">&</span>content, <span class="kw-2">&mut </span>attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprLoop { |
| attrs, |
| label, |
| loop_token, |
| body: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprMatch { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>match_token: <span class="macro">Token!</span>[<span class="kw">match</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>expr = Expr::parse_without_eager_brace(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| attr::parsing::parse_inner(<span class="kw-2">&</span>content, <span class="kw-2">&mut </span>attrs)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>arms = Vec::new(); |
| <span class="kw">while </span>!content.is_empty() { |
| arms.push(content.call(Arm::parse)<span class="question-mark">?</span>); |
| } |
| |
| <span class="prelude-val">Ok</span>(ExprMatch { |
| attrs, |
| match_token, |
| expr: Box::new(expr), |
| brace_token, |
| arms, |
| }) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_by_parsing_expr { |
| ( |
| $( |
| <span class="macro-nonterminal">$expr_type</span>:ty, <span class="macro-nonterminal">$variant</span>:ident, <span class="macro-nonterminal">$msg</span>:expr, |
| )* |
| ) => { |
| $( |
| <span class="attribute">#[cfg(all(feature = <span class="string">"full"</span>, feature = <span class="string">"printing"</span>))] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span><span class="macro-nonterminal">$expr_type </span>{ |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>expr: Expr = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>expr { |
| Expr::<span class="macro-nonterminal">$variant</span>(inner) => <span class="kw">return </span><span class="prelude-val">Ok</span>(inner), |
| Expr::Group(next) => expr = <span class="kw-2">*</span>next.expr, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned(expr, <span class="macro-nonterminal">$msg</span>)), |
| } |
| } |
| } |
| } |
| )* |
| }; |
| } |
| |
| <span class="macro">impl_by_parsing_expr! </span>{ |
| ExprAssign, Assign, <span class="string">"expected assignment expression"</span>, |
| ExprAwait, Await, <span class="string">"expected await expression"</span>, |
| ExprBinary, Binary, <span class="string">"expected binary operation"</span>, |
| ExprCall, Call, <span class="string">"expected function call expression"</span>, |
| ExprCast, Cast, <span class="string">"expected cast expression"</span>, |
| ExprField, Field, <span class="string">"expected struct field access"</span>, |
| ExprIndex, Index, <span class="string">"expected indexing expression"</span>, |
| ExprMethodCall, MethodCall, <span class="string">"expected method call expression"</span>, |
| ExprRange, Range, <span class="string">"expected range expression"</span>, |
| ExprTry, Try, <span class="string">"expected try expression"</span>, |
| ExprTuple, Tuple, <span class="string">"expected tuple expression"</span>, |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprUnary { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>attrs = Vec::new(); |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| expr_unary(input, attrs, allow_struct) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_unary( |
| input: ParseStream, |
| attrs: Vec<Attribute>, |
| allow_struct: AllowStruct, |
| ) -> <span class="prelude-ty">Result</span><ExprUnary> { |
| <span class="prelude-val">Ok</span>(ExprUnary { |
| attrs, |
| op: input.parse()<span class="question-mark">?</span>, |
| expr: Box::new(unary_expr(input, allow_struct)<span class="question-mark">?</span>), |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprClosure { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| expr_closure(input, allow_struct) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprReference { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| <span class="prelude-val">Ok</span>(ExprReference { |
| attrs: Vec::new(), |
| and_token: input.parse()<span class="question-mark">?</span>, |
| mutability: input.parse()<span class="question-mark">?</span>, |
| expr: Box::new(unary_expr(input, allow_struct)<span class="question-mark">?</span>), |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprBreak { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| expr_break(input, allow_struct) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprReturn { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>allow_struct = AllowStruct(<span class="bool-val">true</span>); |
| expr_ret(input, allow_struct) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprTryBlock { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprTryBlock { |
| attrs: Vec::new(), |
| try_token: input.parse()<span class="question-mark">?</span>, |
| block: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprYield { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprYield { |
| attrs: Vec::new(), |
| yield_token: input.parse()<span class="question-mark">?</span>, |
| expr: { |
| <span class="kw">if </span>!input.is_empty() && !input.peek(<span class="macro">Token!</span>[,]) && !input.peek(<span class="macro">Token!</span>[;]) { |
| <span class="prelude-val">Some</span>(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_closure(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><ExprClosure> { |
| <span class="kw">let </span>lifetimes: <span class="prelude-ty">Option</span><BoundLifetimes> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>constness: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">const</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>movability: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">static</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>asyncness: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">async</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>capture: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[<span class="kw">move</span>]> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>or1_token: <span class="macro">Token!</span>[|] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>inputs = Punctuated::new(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[|]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>value = closure_arg(input)<span class="question-mark">?</span>; |
| inputs.push_value(value); |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[|]) { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>punct: <span class="macro">Token!</span>[,] = input.parse()<span class="question-mark">?</span>; |
| inputs.push_punct(punct); |
| } |
| |
| <span class="kw">let </span>or2_token: <span class="macro">Token!</span>[|] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>(output, body) = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[->]) { |
| <span class="kw">let </span>arrow_token: <span class="macro">Token!</span>[->] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>ty: Type = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>body: Block = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>output = ReturnType::Type(arrow_token, Box::new(ty)); |
| <span class="kw">let </span>block = Expr::Block(ExprBlock { |
| attrs: Vec::new(), |
| label: <span class="prelude-val">None</span>, |
| block: body, |
| }); |
| (output, block) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>body = ambiguous_expr(input, allow_struct)<span class="question-mark">?</span>; |
| (ReturnType::Default, body) |
| }; |
| |
| <span class="prelude-val">Ok</span>(ExprClosure { |
| attrs: Vec::new(), |
| lifetimes, |
| constness, |
| movability, |
| asyncness, |
| capture, |
| or1_token, |
| inputs, |
| or2_token, |
| output, |
| body: Box::new(body), |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprAsync { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprAsync { |
| attrs: Vec::new(), |
| async_token: input.parse()<span class="question-mark">?</span>, |
| capture: input.parse()<span class="question-mark">?</span>, |
| block: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>closure_arg(input: ParseStream) -> <span class="prelude-ty">Result</span><Pat> { |
| <span class="kw">let </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>pat = Pat::parse_single(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[:]) { |
| <span class="prelude-val">Ok</span>(Pat::Type(PatType { |
| attrs, |
| pat: Box::new(pat), |
| colon_token: input.parse()<span class="question-mark">?</span>, |
| ty: input.parse()<span class="question-mark">?</span>, |
| })) |
| } <span class="kw">else </span>{ |
| <span class="kw">match </span><span class="kw-2">&mut </span>pat { |
| Pat::Const(pat) => pat.attrs = attrs, |
| Pat::Ident(pat) => pat.attrs = attrs, |
| Pat::Lit(pat) => pat.attrs = attrs, |
| Pat::Macro(pat) => pat.attrs = attrs, |
| Pat::Or(pat) => pat.attrs = attrs, |
| Pat::Paren(pat) => pat.attrs = attrs, |
| Pat::Path(pat) => pat.attrs = attrs, |
| Pat::Range(pat) => pat.attrs = attrs, |
| Pat::Reference(pat) => pat.attrs = attrs, |
| Pat::Rest(pat) => pat.attrs = attrs, |
| Pat::Slice(pat) => pat.attrs = attrs, |
| Pat::Struct(pat) => pat.attrs = attrs, |
| Pat::Tuple(pat) => pat.attrs = attrs, |
| Pat::TupleStruct(pat) => pat.attrs = attrs, |
| Pat::Type(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| Pat::Verbatim(<span class="kw">_</span>) => {} |
| Pat::Wild(pat) => pat.attrs = attrs, |
| } |
| <span class="prelude-val">Ok</span>(pat) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprWhile { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>label: <span class="prelude-ty">Option</span><Label> = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>while_token: <span class="macro">Token!</span>[<span class="kw">while</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>cond = Expr::parse_without_eager_brace(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| attr::parsing::parse_inner(<span class="kw-2">&</span>content, <span class="kw-2">&mut </span>attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprWhile { |
| attrs, |
| label, |
| while_token, |
| cond: Box::new(cond), |
| body: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprConst { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>const_token: <span class="macro">Token!</span>[<span class="kw">const</span>] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| <span class="kw">let </span>inner_attrs = content.call(Attribute::parse_inner)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprConst { |
| attrs: inner_attrs, |
| const_token, |
| block: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Label { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(Label { |
| name: input.parse()<span class="question-mark">?</span>, |
| colon_token: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span><span class="prelude-ty">Option</span><Label> { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">if </span>input.peek(Lifetime) { |
| input.parse().map(<span class="prelude-val">Some</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprContinue { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ExprContinue { |
| attrs: Vec::new(), |
| continue_token: input.parse()<span class="question-mark">?</span>, |
| label: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_break(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><ExprBreak> { |
| <span class="prelude-val">Ok</span>(ExprBreak { |
| attrs: Vec::new(), |
| break_token: input.parse()<span class="question-mark">?</span>, |
| label: input.parse()<span class="question-mark">?</span>, |
| expr: { |
| <span class="kw">if </span>input.is_empty() |
| || input.peek(<span class="macro">Token!</span>[,]) |
| || input.peek(<span class="macro">Token!</span>[;]) |
| || !allow_struct.<span class="number">0 </span>&& input.peek(token::Brace) |
| { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>expr = ambiguous_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(Box::new(expr)) |
| } |
| }, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_ret(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><ExprReturn> { |
| <span class="prelude-val">Ok</span>(ExprReturn { |
| attrs: Vec::new(), |
| return_token: input.parse()<span class="question-mark">?</span>, |
| expr: { |
| <span class="kw">if </span>input.is_empty() || input.peek(<span class="macro">Token!</span>[,]) || input.peek(<span class="macro">Token!</span>[;]) { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="comment">// NOTE: return is greedy and eats blocks after it even when in a |
| // position where structs are not allowed, such as in if statement |
| // conditions. For example: |
| // |
| // if return { println!("A") } {} // Prints "A" |
| </span><span class="kw">let </span>expr = ambiguous_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(Box::new(expr)) |
| } |
| }, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>FieldValue { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>member: Member = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>(colon_token, value) = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[:]) || !member.is_named() { |
| <span class="kw">let </span>colon_token: <span class="macro">Token!</span>[:] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>value: Expr = input.parse()<span class="question-mark">?</span>; |
| (<span class="prelude-val">Some</span>(colon_token), value) |
| } <span class="kw">else if let </span>Member::Named(ident) = <span class="kw-2">&</span>member { |
| <span class="kw">let </span>value = Expr::Path(ExprPath { |
| attrs: Vec::new(), |
| qself: <span class="prelude-val">None</span>, |
| path: Path::from(ident.clone()), |
| }); |
| (<span class="prelude-val">None</span>, value) |
| } <span class="kw">else </span>{ |
| <span class="macro">unreachable!</span>() |
| }; |
| |
| <span class="prelude-val">Ok</span>(FieldValue { |
| attrs, |
| member, |
| colon_token, |
| expr: value, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprStruct { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>(qself, path) = path::parsing::qpath(input, <span class="bool-val">true</span>)<span class="question-mark">?</span>; |
| expr_struct_helper(input, qself, path) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_struct_helper( |
| input: ParseStream, |
| qself: <span class="prelude-ty">Option</span><QSelf>, |
| path: Path, |
| ) -> <span class="prelude-ty">Result</span><ExprStruct> { |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>fields = Punctuated::new(); |
| <span class="kw">while </span>!content.is_empty() { |
| <span class="kw">if </span>content.peek(<span class="macro">Token!</span>[..]) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(ExprStruct { |
| attrs: Vec::new(), |
| qself, |
| path, |
| brace_token, |
| fields, |
| dot2_token: <span class="prelude-val">Some</span>(content.parse()<span class="question-mark">?</span>), |
| rest: <span class="kw">if </span>content.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(Box::new(content.parse()<span class="question-mark">?</span>)) |
| }, |
| }); |
| } |
| |
| fields.push(content.parse()<span class="question-mark">?</span>); |
| <span class="kw">if </span>content.is_empty() { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">let </span>punct: <span class="macro">Token!</span>[,] = content.parse()<span class="question-mark">?</span>; |
| fields.push_punct(punct); |
| } |
| |
| <span class="prelude-val">Ok</span>(ExprStruct { |
| attrs: Vec::new(), |
| qself, |
| path, |
| brace_token, |
| fields, |
| dot2_token: <span class="prelude-val">None</span>, |
| rest: <span class="prelude-val">None</span>, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprUnsafe { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>unsafe_token: <span class="macro">Token!</span>[<span class="kw">unsafe</span>] = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| <span class="kw">let </span>inner_attrs = content.call(Attribute::parse_inner)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprUnsafe { |
| attrs: inner_attrs, |
| unsafe_token, |
| block: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprBlock { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>label: <span class="prelude-ty">Option</span><Label> = input.parse()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>content; |
| <span class="kw">let </span>brace_token = <span class="macro">braced!</span>(content <span class="kw">in </span>input); |
| attr::parsing::parse_inner(<span class="kw-2">&</span>content, <span class="kw-2">&mut </span>attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span>stmts = content.call(Block::parse_within)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprBlock { |
| attrs, |
| label, |
| block: Block { brace_token, stmts }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>expr_range(input: ParseStream, allow_struct: AllowStruct) -> <span class="prelude-ty">Result</span><ExprRange> { |
| <span class="kw">let </span>limits: RangeLimits = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>end = <span class="kw">if </span><span class="macro">matches!</span>(limits, RangeLimits::HalfOpen(<span class="kw">_</span>)) |
| && (input.is_empty() |
| || input.peek(<span class="macro">Token!</span>[,]) |
| || input.peek(<span class="macro">Token!</span>[;]) |
| || input.peek(<span class="macro">Token!</span>[.]) && !input.peek(<span class="macro">Token!</span>[..]) |
| || !allow_struct.<span class="number">0 </span>&& input.peek(token::Brace)) |
| { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>to = ambiguous_expr(input, allow_struct)<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(Box::new(to)) |
| }; |
| <span class="prelude-val">Ok</span>(ExprRange { |
| attrs: Vec::new(), |
| start: <span class="prelude-val">None</span>, |
| limits, |
| end, |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>RangeLimits { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>lookahead = input.lookahead1(); |
| <span class="kw">let </span>dot_dot = lookahead.peek(<span class="macro">Token!</span>[..]); |
| <span class="kw">let </span>dot_dot_eq = dot_dot && lookahead.peek(<span class="macro">Token!</span>[..=]); |
| <span class="kw">let </span>dot_dot_dot = dot_dot && input.peek(<span class="macro">Token!</span>[...]); |
| <span class="kw">if </span>dot_dot_eq { |
| input.parse().map(RangeLimits::Closed) |
| } <span class="kw">else if </span>dot_dot && !dot_dot_dot { |
| input.parse().map(RangeLimits::HalfOpen) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(lookahead.error()) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">impl </span>RangeLimits { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_obsolete(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>lookahead = input.lookahead1(); |
| <span class="kw">let </span>dot_dot = lookahead.peek(<span class="macro">Token!</span>[..]); |
| <span class="kw">let </span>dot_dot_eq = dot_dot && lookahead.peek(<span class="macro">Token!</span>[..=]); |
| <span class="kw">let </span>dot_dot_dot = dot_dot && input.peek(<span class="macro">Token!</span>[...]); |
| <span class="kw">if </span>dot_dot_eq { |
| input.parse().map(RangeLimits::Closed) |
| } <span class="kw">else if </span>dot_dot_dot { |
| <span class="kw">let </span>dot3: <span class="macro">Token!</span>[...] = input.parse()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(RangeLimits::Closed(<span class="macro">Token!</span>[..=](dot3.spans))) |
| } <span class="kw">else if </span>dot_dot { |
| input.parse().map(RangeLimits::HalfOpen) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(lookahead.error()) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>ExprPath { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">let </span>attrs = Vec::new(); |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">let </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>(qself, path) = path::parsing::qpath(input, <span class="bool-val">true</span>)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(ExprPath { attrs, qself, path }) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Member { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">if </span>input.peek(Ident) { |
| input.parse().map(Member::Named) |
| } <span class="kw">else if </span>input.peek(LitInt) { |
| input.parse().map(Member::Unnamed) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(input.error(<span class="string">"expected identifier or integer"</span>)) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Arm { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><Arm> { |
| <span class="kw">let </span>requires_comma; |
| <span class="prelude-val">Ok</span>(Arm { |
| attrs: input.call(Attribute::parse_outer)<span class="question-mark">?</span>, |
| pat: Pat::parse_multi_with_leading_vert(input)<span class="question-mark">?</span>, |
| guard: { |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">if</span>]) { |
| <span class="kw">let </span>if_token: <span class="macro">Token!</span>[<span class="kw">if</span>] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>guard: Expr = input.parse()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>((if_token, Box::new(guard))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }, |
| fat_arrow_token: input.parse()<span class="question-mark">?</span>, |
| body: { |
| <span class="kw">let </span>body = input.call(expr_early)<span class="question-mark">?</span>; |
| requires_comma = requires_terminator(<span class="kw-2">&</span>body); |
| Box::new(body) |
| }, |
| comma: { |
| <span class="kw">if </span>requires_comma && !input.is_empty() { |
| <span class="prelude-val">Some</span>(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| input.parse()<span class="question-mark">? |
| </span>} |
| }, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Index { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>lit: LitInt = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if </span>lit.suffix().is_empty() { |
| <span class="prelude-val">Ok</span>(Index { |
| index: lit |
| .base10_digits() |
| .parse() |
| .map_err(|err| Error::new(lit.span(), err))<span class="question-mark">?</span>, |
| span: lit.span(), |
| }) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(Error::new(lit.span(), <span class="string">"expected unsuffixed integer"</span>)) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>multi_index(e: <span class="kw-2">&mut </span>Expr, dot_token: <span class="kw-2">&mut </span><span class="macro">Token!</span>[.], float: LitFloat) -> <span class="prelude-ty">Result</span><bool> { |
| <span class="kw">let </span>float_token = float.token(); |
| <span class="kw">let </span>float_span = float_token.span(); |
| <span class="kw">let </span><span class="kw-2">mut </span>float_repr = float_token.to_string(); |
| <span class="kw">let </span>trailing_dot = float_repr.ends_with(<span class="string">'.'</span>); |
| <span class="kw">if </span>trailing_dot { |
| float_repr.truncate(float_repr.len() - <span class="number">1</span>); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0</span>; |
| <span class="kw">for </span>part <span class="kw">in </span>float_repr.split(<span class="string">'.'</span>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>index: Index = |
| <span class="kw">crate</span>::parse_str(part).map_err(|err| Error::new(float_span, err))<span class="question-mark">?</span>; |
| <span class="kw">let </span>part_end = offset + part.len(); |
| index.span = float_token.subspan(offset..part_end).unwrap_or(float_span); |
| |
| <span class="kw">let </span>base = mem::replace(e, Expr::DUMMY); |
| <span class="kw-2">*</span>e = Expr::Field(ExprField { |
| attrs: Vec::new(), |
| base: Box::new(base), |
| dot_token: <span class="macro">Token!</span>[.](dot_token.span), |
| member: Member::Unnamed(index), |
| }); |
| |
| <span class="kw">let </span>dot_span = float_token |
| .subspan(part_end..part_end + <span class="number">1</span>) |
| .unwrap_or(float_span); |
| <span class="kw-2">*</span>dot_token = <span class="macro">Token!</span>[.](dot_span); |
| offset = part_end + <span class="number">1</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(!trailing_dot) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">impl </span>Member { |
| <span class="kw">fn </span>is_named(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Member::Named(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| Member::Unnamed(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>check_cast(input: ParseStream) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>kind = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[.]) && !input.peek(<span class="macro">Token!</span>[..]) { |
| <span class="kw">if </span>input.peek2(<span class="macro">Token!</span>[<span class="kw">await</span>]) { |
| <span class="string">"`.await`" |
| </span>} <span class="kw">else if </span>input.peek2(Ident) && (input.peek3(token::Paren) || input.peek3(<span class="macro">Token!</span>[::])) { |
| <span class="string">"a method call" |
| </span>} <span class="kw">else </span>{ |
| <span class="string">"a field access" |
| </span>} |
| } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[<span class="question-mark">?</span>]) { |
| <span class="string">"`?`" |
| </span>} <span class="kw">else if </span>input.peek(token::Bracket) { |
| <span class="string">"indexing" |
| </span>} <span class="kw">else if </span>input.peek(token::Paren) { |
| <span class="string">"a function call" |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| }; |
| <span class="kw">let </span>msg = <span class="macro">format!</span>(<span class="string">"casts cannot be followed by {}"</span>, kind); |
| <span class="prelude-val">Err</span>(input.error(msg)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>printing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::attr::FilterAttrs; |
| <span class="kw">use </span>proc_macro2::{Literal, TokenStream}; |
| <span class="kw">use </span>quote::{ToTokens, TokenStreamExt}; |
| |
| <span class="comment">// If the given expression is a bare `ExprStruct`, wraps it in parenthesis |
| // before appending it to `TokenStream`. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>wrap_bare_struct(tokens: <span class="kw-2">&mut </span>TokenStream, e: <span class="kw-2">&</span>Expr) { |
| <span class="kw">if let </span>Expr::Struct(<span class="kw">_</span>) = <span class="kw-2">*</span>e { |
| token::Paren::default().surround(tokens, |tokens| { |
| e.to_tokens(tokens); |
| }); |
| } <span class="kw">else </span>{ |
| e.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>outer_attrs_to_tokens(attrs: <span class="kw-2">&</span>[Attribute], tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append_all(attrs.outer()); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span><span class="kw">fn </span>inner_attrs_to_tokens(attrs: <span class="kw-2">&</span>[Attribute], tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append_all(attrs.inner()); |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>outer_attrs_to_tokens(_attrs: <span class="kw-2">&</span>[Attribute], _tokens: <span class="kw-2">&mut </span>TokenStream) {} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprArray { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.bracket_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.elems.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprAssign { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.left.to_tokens(tokens); |
| <span class="self">self</span>.eq_token.to_tokens(tokens); |
| <span class="self">self</span>.right.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprAsync { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.async_token.to_tokens(tokens); |
| <span class="self">self</span>.capture.to_tokens(tokens); |
| <span class="self">self</span>.block.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprAwait { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.base.to_tokens(tokens); |
| <span class="self">self</span>.dot_token.to_tokens(tokens); |
| <span class="self">self</span>.await_token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprBinary { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.left.to_tokens(tokens); |
| <span class="self">self</span>.op.to_tokens(tokens); |
| <span class="self">self</span>.right.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprBlock { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| <span class="self">self</span>.block.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.block.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprBreak { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.break_token.to_tokens(tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprCall { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.func.to_tokens(tokens); |
| <span class="self">self</span>.paren_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.args.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprCast { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| <span class="self">self</span>.as_token.to_tokens(tokens); |
| <span class="self">self</span>.ty.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprClosure { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.lifetimes.to_tokens(tokens); |
| <span class="self">self</span>.constness.to_tokens(tokens); |
| <span class="self">self</span>.movability.to_tokens(tokens); |
| <span class="self">self</span>.asyncness.to_tokens(tokens); |
| <span class="self">self</span>.capture.to_tokens(tokens); |
| <span class="self">self</span>.or1_token.to_tokens(tokens); |
| <span class="self">self</span>.inputs.to_tokens(tokens); |
| <span class="self">self</span>.or2_token.to_tokens(tokens); |
| <span class="self">self</span>.output.to_tokens(tokens); |
| <span class="self">self</span>.body.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprConst { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.const_token.to_tokens(tokens); |
| <span class="self">self</span>.block.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.block.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprContinue { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.continue_token.to_tokens(tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprField { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.base.to_tokens(tokens); |
| <span class="self">self</span>.dot_token.to_tokens(tokens); |
| <span class="self">self</span>.member.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprForLoop { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| <span class="self">self</span>.for_token.to_tokens(tokens); |
| <span class="self">self</span>.pat.to_tokens(tokens); |
| <span class="self">self</span>.in_token.to_tokens(tokens); |
| wrap_bare_struct(tokens, <span class="kw-2">&</span><span class="self">self</span>.expr); |
| <span class="self">self</span>.body.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.body.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprGroup { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.group_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprIf { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.if_token.to_tokens(tokens); |
| wrap_bare_struct(tokens, <span class="kw-2">&</span><span class="self">self</span>.cond); |
| <span class="self">self</span>.then_branch.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((else_token, else_)) = <span class="kw-2">&</span><span class="self">self</span>.else_branch { |
| else_token.to_tokens(tokens); |
| <span class="comment">// If we are not one of the valid expressions to exist in an else |
| // clause, wrap ourselves in a block. |
| </span><span class="kw">match </span><span class="kw-2">**</span>else_ { |
| Expr::If(<span class="kw">_</span>) | Expr::Block(<span class="kw">_</span>) => else_.to_tokens(tokens), |
| <span class="kw">_ </span>=> token::Brace::default().surround(tokens, |tokens| else_.to_tokens(tokens)), |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprIndex { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| <span class="self">self</span>.bracket_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.index.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprInfer { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.underscore_token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprLet { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.let_token.to_tokens(tokens); |
| <span class="self">self</span>.pat.to_tokens(tokens); |
| <span class="self">self</span>.eq_token.to_tokens(tokens); |
| wrap_bare_struct(tokens, <span class="kw-2">&</span><span class="self">self</span>.expr); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprLit { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.lit.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprLoop { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| <span class="self">self</span>.loop_token.to_tokens(tokens); |
| <span class="self">self</span>.body.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.body.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprMacro { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.mac.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprMatch { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.match_token.to_tokens(tokens); |
| wrap_bare_struct(tokens, <span class="kw-2">&</span><span class="self">self</span>.expr); |
| <span class="self">self</span>.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="kw">for </span>(i, arm) <span class="kw">in </span><span class="self">self</span>.arms.iter().enumerate() { |
| arm.to_tokens(tokens); |
| <span class="comment">// Ensure that we have a comma after a non-block arm, except |
| // for the last one. |
| </span><span class="kw">let </span>is_last = i == <span class="self">self</span>.arms.len() - <span class="number">1</span>; |
| <span class="kw">if </span>!is_last && requires_terminator(<span class="kw-2">&</span>arm.body) && arm.comma.is_none() { |
| <<span class="macro">Token!</span>[,]>::default().to_tokens(tokens); |
| } |
| } |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprMethodCall { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.receiver.to_tokens(tokens); |
| <span class="self">self</span>.dot_token.to_tokens(tokens); |
| <span class="self">self</span>.method.to_tokens(tokens); |
| <span class="self">self</span>.turbofish.to_tokens(tokens); |
| <span class="self">self</span>.paren_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.args.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprParen { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.paren_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprPath { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| path::printing::print_path(tokens, <span class="kw-2">&</span><span class="self">self</span>.qself, <span class="kw-2">&</span><span class="self">self</span>.path); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprRange { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.start.to_tokens(tokens); |
| <span class="self">self</span>.limits.to_tokens(tokens); |
| <span class="self">self</span>.end.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprReference { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.and_token.to_tokens(tokens); |
| <span class="self">self</span>.mutability.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprRepeat { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.bracket_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| <span class="self">self</span>.semi_token.to_tokens(tokens); |
| <span class="self">self</span>.len.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprReturn { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.return_token.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprStruct { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| path::printing::print_path(tokens, <span class="kw-2">&</span><span class="self">self</span>.qself, <span class="kw-2">&</span><span class="self">self</span>.path); |
| <span class="self">self</span>.brace_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.fields.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(dot2_token) = <span class="kw-2">&</span><span class="self">self</span>.dot2_token { |
| dot2_token.to_tokens(tokens); |
| } <span class="kw">else if </span><span class="self">self</span>.rest.is_some() { |
| <span class="macro">Token!</span>[..](Span::call_site()).to_tokens(tokens); |
| } |
| <span class="self">self</span>.rest.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprTry { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| <span class="self">self</span>.question_token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprTryBlock { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.try_token.to_tokens(tokens); |
| <span class="self">self</span>.block.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprTuple { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.paren_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.elems.to_tokens(tokens); |
| <span class="comment">// If we only have one argument, we need a trailing comma to |
| // distinguish ExprTuple from ExprParen. |
| </span><span class="kw">if </span><span class="self">self</span>.elems.len() == <span class="number">1 </span>&& !<span class="self">self</span>.elems.trailing_punct() { |
| <<span class="macro">Token!</span>[,]>::default().to_tokens(tokens); |
| } |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprUnary { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.op.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprUnsafe { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.unsafe_token.to_tokens(tokens); |
| <span class="self">self</span>.block.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.block.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprWhile { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.label.to_tokens(tokens); |
| <span class="self">self</span>.while_token.to_tokens(tokens); |
| wrap_bare_struct(tokens, <span class="kw-2">&</span><span class="self">self</span>.cond); |
| <span class="self">self</span>.body.brace_token.surround(tokens, |tokens| { |
| inner_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.body.stmts); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>ExprYield { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.yield_token.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Arm { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.attrs); |
| <span class="self">self</span>.pat.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((if_token, guard)) = <span class="kw-2">&</span><span class="self">self</span>.guard { |
| if_token.to_tokens(tokens); |
| guard.to_tokens(tokens); |
| } |
| <span class="self">self</span>.fat_arrow_token.to_tokens(tokens); |
| <span class="self">self</span>.body.to_tokens(tokens); |
| <span class="self">self</span>.comma.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>FieldValue { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| outer_attrs_to_tokens(<span class="kw-2">&</span><span class="self">self</span>.attrs, tokens); |
| <span class="self">self</span>.member.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(colon_token) = <span class="kw-2">&</span><span class="self">self</span>.colon_token { |
| colon_token.to_tokens(tokens); |
| <span class="self">self</span>.expr.to_tokens(tokens); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Index { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">let </span><span class="kw-2">mut </span>lit = Literal::i64_unsuffixed(i64::from(<span class="self">self</span>.index)); |
| lit.set_span(<span class="self">self</span>.span); |
| tokens.append(lit); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Label { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.name.to_tokens(tokens); |
| <span class="self">self</span>.colon_token.to_tokens(tokens); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Member { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Member::Named(ident) => ident.to_tokens(tokens), |
| Member::Unnamed(index) => index.to_tokens(tokens), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>RangeLimits { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| RangeLimits::HalfOpen(t) => t.to_tokens(tokens), |
| RangeLimits::Closed(t) => t.to_tokens(tokens), |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |