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e74abb32 XL |
1 | use super::*; |
2 | use crate::punctuated::Punctuated; | |
1b1a35ee XL |
3 | #[cfg(feature = "full")] |
4 | use crate::reserved::Reserved; | |
e74abb32 | 5 | use proc_macro2::{Span, TokenStream}; |
60c5eb7d XL |
6 | #[cfg(feature = "printing")] |
7 | use quote::IdentFragment; | |
8 | #[cfg(feature = "printing")] | |
9 | use std::fmt::{self, Display}; | |
e74abb32 | 10 | use std::hash::{Hash, Hasher}; |
3dfed10e | 11 | #[cfg(feature = "parsing")] |
e74abb32 XL |
12 | use std::mem; |
13 | ||
14 | ast_enum_of_structs! { | |
15 | /// A Rust expression. | |
16 | /// | |
f035d41b XL |
17 | /// *This type is available only if Syn is built with the `"derive"` or `"full"` |
18 | /// feature, but most of the variants are not available unless "full" is enabled.* | |
e74abb32 XL |
19 | /// |
20 | /// # Syntax tree enums | |
21 | /// | |
22 | /// This type is a syntax tree enum. In Syn this and other syntax tree enums | |
23 | /// are designed to be traversed using the following rebinding idiom. | |
24 | /// | |
25 | /// ``` | |
26 | /// # use syn::Expr; | |
27 | /// # | |
28 | /// # fn example(expr: Expr) { | |
29 | /// # const IGNORE: &str = stringify! { | |
30 | /// let expr: Expr = /* ... */; | |
31 | /// # }; | |
32 | /// match expr { | |
33 | /// Expr::MethodCall(expr) => { | |
34 | /// /* ... */ | |
35 | /// } | |
36 | /// Expr::Cast(expr) => { | |
37 | /// /* ... */ | |
38 | /// } | |
39 | /// Expr::If(expr) => { | |
40 | /// /* ... */ | |
41 | /// } | |
42 | /// | |
43 | /// /* ... */ | |
44 | /// # _ => {} | |
45 | /// # } | |
46 | /// # } | |
47 | /// ``` | |
48 | /// | |
49 | /// We begin with a variable `expr` of type `Expr` that has no fields | |
50 | /// (because it is an enum), and by matching on it and rebinding a variable | |
51 | /// with the same name `expr` we effectively imbue our variable with all of | |
52 | /// the data fields provided by the variant that it turned out to be. So for | |
53 | /// example above if we ended up in the `MethodCall` case then we get to use | |
54 | /// `expr.receiver`, `expr.args` etc; if we ended up in the `If` case we get | |
55 | /// to use `expr.cond`, `expr.then_branch`, `expr.else_branch`. | |
56 | /// | |
57 | /// This approach avoids repeating the variant names twice on every line. | |
58 | /// | |
59 | /// ``` | |
60 | /// # use syn::{Expr, ExprMethodCall}; | |
61 | /// # | |
62 | /// # fn example(expr: Expr) { | |
63 | /// // Repetitive; recommend not doing this. | |
64 | /// match expr { | |
65 | /// Expr::MethodCall(ExprMethodCall { method, args, .. }) => { | |
66 | /// # } | |
67 | /// # _ => {} | |
68 | /// # } | |
69 | /// # } | |
70 | /// ``` | |
71 | /// | |
72 | /// In general, the name to which a syntax tree enum variant is bound should | |
73 | /// be a suitable name for the complete syntax tree enum type. | |
74 | /// | |
75 | /// ``` | |
76 | /// # use syn::{Expr, ExprField}; | |
77 | /// # | |
78 | /// # fn example(discriminant: ExprField) { | |
79 | /// // Binding is called `base` which is the name I would use if I were | |
80 | /// // assigning `*discriminant.base` without an `if let`. | |
81 | /// if let Expr::Tuple(base) = *discriminant.base { | |
82 | /// # } | |
83 | /// # } | |
84 | /// ``` | |
85 | /// | |
86 | /// A sign that you may not be choosing the right variable names is if you | |
87 | /// see names getting repeated in your code, like accessing | |
88 | /// `receiver.receiver` or `pat.pat` or `cond.cond`. | |
5869c6ff | 89 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
1b1a35ee | 90 | pub enum Expr { |
e74abb32 XL |
91 | /// A slice literal expression: `[a, b, c, d]`. |
92 | Array(ExprArray), | |
93 | ||
94 | /// An assignment expression: `a = compute()`. | |
95 | Assign(ExprAssign), | |
96 | ||
97 | /// A compound assignment expression: `counter += 1`. | |
98 | AssignOp(ExprAssignOp), | |
99 | ||
100 | /// An async block: `async { ... }`. | |
101 | Async(ExprAsync), | |
102 | ||
103 | /// An await expression: `fut.await`. | |
104 | Await(ExprAwait), | |
105 | ||
106 | /// A binary operation: `a + b`, `a * b`. | |
107 | Binary(ExprBinary), | |
108 | ||
109 | /// A blocked scope: `{ ... }`. | |
110 | Block(ExprBlock), | |
111 | ||
112 | /// A box expression: `box f`. | |
113 | Box(ExprBox), | |
114 | ||
115 | /// A `break`, with an optional label to break and an optional | |
116 | /// expression. | |
117 | Break(ExprBreak), | |
118 | ||
119 | /// A function call expression: `invoke(a, b)`. | |
120 | Call(ExprCall), | |
121 | ||
122 | /// A cast expression: `foo as f64`. | |
123 | Cast(ExprCast), | |
124 | ||
125 | /// A closure expression: `|a, b| a + b`. | |
126 | Closure(ExprClosure), | |
127 | ||
128 | /// A `continue`, with an optional label. | |
129 | Continue(ExprContinue), | |
130 | ||
131 | /// Access of a named struct field (`obj.k`) or unnamed tuple struct | |
132 | /// field (`obj.0`). | |
133 | Field(ExprField), | |
134 | ||
135 | /// A for loop: `for pat in expr { ... }`. | |
136 | ForLoop(ExprForLoop), | |
137 | ||
138 | /// An expression contained within invisible delimiters. | |
139 | /// | |
140 | /// This variant is important for faithfully representing the precedence | |
141 | /// of expressions and is related to `None`-delimited spans in a | |
142 | /// `TokenStream`. | |
143 | Group(ExprGroup), | |
144 | ||
145 | /// An `if` expression with an optional `else` block: `if expr { ... } | |
146 | /// else { ... }`. | |
147 | /// | |
148 | /// The `else` branch expression may only be an `If` or `Block` | |
149 | /// expression, not any of the other types of expression. | |
150 | If(ExprIf), | |
151 | ||
152 | /// A square bracketed indexing expression: `vector[2]`. | |
153 | Index(ExprIndex), | |
154 | ||
155 | /// A `let` guard: `let Some(x) = opt`. | |
156 | Let(ExprLet), | |
157 | ||
158 | /// A literal in place of an expression: `1`, `"foo"`. | |
159 | Lit(ExprLit), | |
160 | ||
161 | /// Conditionless loop: `loop { ... }`. | |
162 | Loop(ExprLoop), | |
163 | ||
164 | /// A macro invocation expression: `format!("{}", q)`. | |
165 | Macro(ExprMacro), | |
166 | ||
167 | /// A `match` expression: `match n { Some(n) => {}, None => {} }`. | |
168 | Match(ExprMatch), | |
169 | ||
170 | /// A method call expression: `x.foo::<T>(a, b)`. | |
171 | MethodCall(ExprMethodCall), | |
172 | ||
173 | /// A parenthesized expression: `(a + b)`. | |
174 | Paren(ExprParen), | |
175 | ||
176 | /// A path like `std::mem::replace` possibly containing generic | |
177 | /// parameters and a qualified self-type. | |
178 | /// | |
179 | /// A plain identifier like `x` is a path of length 1. | |
180 | Path(ExprPath), | |
181 | ||
182 | /// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`. | |
183 | Range(ExprRange), | |
184 | ||
185 | /// A referencing operation: `&a` or `&mut a`. | |
186 | Reference(ExprReference), | |
187 | ||
188 | /// An array literal constructed from one repeated element: `[0u8; N]`. | |
189 | Repeat(ExprRepeat), | |
190 | ||
191 | /// A `return`, with an optional value to be returned. | |
192 | Return(ExprReturn), | |
193 | ||
194 | /// A struct literal expression: `Point { x: 1, y: 1 }`. | |
195 | /// | |
196 | /// The `rest` provides the value of the remaining fields as in `S { a: | |
197 | /// 1, b: 1, ..rest }`. | |
198 | Struct(ExprStruct), | |
199 | ||
200 | /// A try-expression: `expr?`. | |
201 | Try(ExprTry), | |
202 | ||
203 | /// A try block: `try { ... }`. | |
204 | TryBlock(ExprTryBlock), | |
205 | ||
206 | /// A tuple expression: `(a, b, c, d)`. | |
207 | Tuple(ExprTuple), | |
208 | ||
209 | /// A type ascription expression: `foo: f64`. | |
210 | Type(ExprType), | |
211 | ||
212 | /// A unary operation: `!x`, `*x`. | |
213 | Unary(ExprUnary), | |
214 | ||
215 | /// An unsafe block: `unsafe { ... }`. | |
216 | Unsafe(ExprUnsafe), | |
217 | ||
218 | /// Tokens in expression position not interpreted by Syn. | |
219 | Verbatim(TokenStream), | |
220 | ||
221 | /// A while loop: `while expr { ... }`. | |
222 | While(ExprWhile), | |
223 | ||
224 | /// A yield expression: `yield expr`. | |
225 | Yield(ExprYield), | |
226 | ||
5869c6ff XL |
227 | // The following is the only supported idiom for exhaustive matching of |
228 | // this enum. | |
229 | // | |
230 | // match expr { | |
231 | // Expr::Array(e) => {...} | |
232 | // Expr::Assign(e) => {...} | |
233 | // ... | |
234 | // Expr::Yield(e) => {...} | |
235 | // | |
236 | // #[cfg(test)] | |
237 | // Expr::__TestExhaustive(_) => unimplemented!(), | |
238 | // #[cfg(not(test))] | |
239 | // _ => { /* some sane fallback */ } | |
240 | // } | |
241 | // | |
242 | // This way we fail your tests but don't break your library when adding | |
243 | // a variant. You will be notified by a test failure when a variant is | |
244 | // added, so that you can add code to handle it, but your library will | |
245 | // continue to compile and work for downstream users in the interim. | |
246 | // | |
247 | // Once `deny(reachable)` is available in rustc, Expr will be | |
248 | // reimplemented as a non_exhaustive enum. | |
249 | // https://github.com/rust-lang/rust/issues/44109#issuecomment-521781237 | |
e74abb32 | 250 | #[doc(hidden)] |
5869c6ff | 251 | __TestExhaustive(crate::private), |
e74abb32 XL |
252 | } |
253 | } | |
254 | ||
255 | ast_struct! { | |
256 | /// A slice literal expression: `[a, b, c, d]`. | |
257 | /// | |
f035d41b | 258 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 259 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
260 | pub struct ExprArray #full { |
261 | pub attrs: Vec<Attribute>, | |
262 | pub bracket_token: token::Bracket, | |
263 | pub elems: Punctuated<Expr, Token![,]>, | |
264 | } | |
265 | } | |
266 | ||
267 | ast_struct! { | |
268 | /// An assignment expression: `a = compute()`. | |
269 | /// | |
f035d41b | 270 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 271 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
272 | pub struct ExprAssign #full { |
273 | pub attrs: Vec<Attribute>, | |
274 | pub left: Box<Expr>, | |
275 | pub eq_token: Token![=], | |
276 | pub right: Box<Expr>, | |
277 | } | |
278 | } | |
279 | ||
280 | ast_struct! { | |
281 | /// A compound assignment expression: `counter += 1`. | |
282 | /// | |
f035d41b | 283 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 284 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
285 | pub struct ExprAssignOp #full { |
286 | pub attrs: Vec<Attribute>, | |
287 | pub left: Box<Expr>, | |
288 | pub op: BinOp, | |
289 | pub right: Box<Expr>, | |
290 | } | |
291 | } | |
292 | ||
293 | ast_struct! { | |
294 | /// An async block: `async { ... }`. | |
295 | /// | |
f035d41b | 296 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 297 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
298 | pub struct ExprAsync #full { |
299 | pub attrs: Vec<Attribute>, | |
300 | pub async_token: Token![async], | |
301 | pub capture: Option<Token![move]>, | |
302 | pub block: Block, | |
303 | } | |
304 | } | |
305 | ||
306 | ast_struct! { | |
307 | /// An await expression: `fut.await`. | |
308 | /// | |
f035d41b | 309 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 310 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
311 | pub struct ExprAwait #full { |
312 | pub attrs: Vec<Attribute>, | |
313 | pub base: Box<Expr>, | |
314 | pub dot_token: Token![.], | |
315 | pub await_token: token::Await, | |
316 | } | |
317 | } | |
318 | ||
319 | ast_struct! { | |
320 | /// A binary operation: `a + b`, `a * b`. | |
321 | /// | |
f035d41b | 322 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 323 | /// `"full"` feature.* |
5869c6ff | 324 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
325 | pub struct ExprBinary { |
326 | pub attrs: Vec<Attribute>, | |
327 | pub left: Box<Expr>, | |
328 | pub op: BinOp, | |
329 | pub right: Box<Expr>, | |
330 | } | |
331 | } | |
332 | ||
333 | ast_struct! { | |
334 | /// A blocked scope: `{ ... }`. | |
335 | /// | |
f035d41b | 336 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 337 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
338 | pub struct ExprBlock #full { |
339 | pub attrs: Vec<Attribute>, | |
340 | pub label: Option<Label>, | |
341 | pub block: Block, | |
342 | } | |
343 | } | |
344 | ||
345 | ast_struct! { | |
346 | /// A box expression: `box f`. | |
347 | /// | |
f035d41b | 348 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 349 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
350 | pub struct ExprBox #full { |
351 | pub attrs: Vec<Attribute>, | |
352 | pub box_token: Token![box], | |
353 | pub expr: Box<Expr>, | |
354 | } | |
355 | } | |
356 | ||
357 | ast_struct! { | |
358 | /// A `break`, with an optional label to break and an optional | |
359 | /// expression. | |
360 | /// | |
f035d41b | 361 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 362 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
363 | pub struct ExprBreak #full { |
364 | pub attrs: Vec<Attribute>, | |
365 | pub break_token: Token![break], | |
366 | pub label: Option<Lifetime>, | |
367 | pub expr: Option<Box<Expr>>, | |
368 | } | |
369 | } | |
370 | ||
371 | ast_struct! { | |
372 | /// A function call expression: `invoke(a, b)`. | |
373 | /// | |
f035d41b | 374 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 375 | /// `"full"` feature.* |
5869c6ff | 376 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
377 | pub struct ExprCall { |
378 | pub attrs: Vec<Attribute>, | |
379 | pub func: Box<Expr>, | |
380 | pub paren_token: token::Paren, | |
381 | pub args: Punctuated<Expr, Token![,]>, | |
382 | } | |
383 | } | |
384 | ||
385 | ast_struct! { | |
386 | /// A cast expression: `foo as f64`. | |
387 | /// | |
f035d41b | 388 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 389 | /// `"full"` feature.* |
5869c6ff | 390 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
391 | pub struct ExprCast { |
392 | pub attrs: Vec<Attribute>, | |
393 | pub expr: Box<Expr>, | |
394 | pub as_token: Token![as], | |
395 | pub ty: Box<Type>, | |
396 | } | |
397 | } | |
398 | ||
399 | ast_struct! { | |
400 | /// A closure expression: `|a, b| a + b`. | |
401 | /// | |
f035d41b | 402 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 403 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
404 | pub struct ExprClosure #full { |
405 | pub attrs: Vec<Attribute>, | |
406 | pub asyncness: Option<Token![async]>, | |
407 | pub movability: Option<Token![static]>, | |
408 | pub capture: Option<Token![move]>, | |
409 | pub or1_token: Token![|], | |
410 | pub inputs: Punctuated<Pat, Token![,]>, | |
411 | pub or2_token: Token![|], | |
412 | pub output: ReturnType, | |
413 | pub body: Box<Expr>, | |
414 | } | |
415 | } | |
416 | ||
417 | ast_struct! { | |
418 | /// A `continue`, with an optional label. | |
419 | /// | |
f035d41b | 420 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 421 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
422 | pub struct ExprContinue #full { |
423 | pub attrs: Vec<Attribute>, | |
424 | pub continue_token: Token![continue], | |
425 | pub label: Option<Lifetime>, | |
426 | } | |
427 | } | |
428 | ||
429 | ast_struct! { | |
430 | /// Access of a named struct field (`obj.k`) or unnamed tuple struct | |
431 | /// field (`obj.0`). | |
432 | /// | |
f035d41b | 433 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 434 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
435 | pub struct ExprField { |
436 | pub attrs: Vec<Attribute>, | |
437 | pub base: Box<Expr>, | |
438 | pub dot_token: Token![.], | |
439 | pub member: Member, | |
440 | } | |
441 | } | |
442 | ||
443 | ast_struct! { | |
444 | /// A for loop: `for pat in expr { ... }`. | |
445 | /// | |
f035d41b | 446 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 447 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
448 | pub struct ExprForLoop #full { |
449 | pub attrs: Vec<Attribute>, | |
450 | pub label: Option<Label>, | |
451 | pub for_token: Token![for], | |
452 | pub pat: Pat, | |
453 | pub in_token: Token![in], | |
454 | pub expr: Box<Expr>, | |
455 | pub body: Block, | |
456 | } | |
457 | } | |
458 | ||
459 | ast_struct! { | |
460 | /// An expression contained within invisible delimiters. | |
461 | /// | |
462 | /// This variant is important for faithfully representing the precedence | |
463 | /// of expressions and is related to `None`-delimited spans in a | |
464 | /// `TokenStream`. | |
465 | /// | |
f035d41b | 466 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 467 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
468 | pub struct ExprGroup #full { |
469 | pub attrs: Vec<Attribute>, | |
470 | pub group_token: token::Group, | |
471 | pub expr: Box<Expr>, | |
472 | } | |
473 | } | |
474 | ||
475 | ast_struct! { | |
476 | /// An `if` expression with an optional `else` block: `if expr { ... } | |
477 | /// else { ... }`. | |
478 | /// | |
479 | /// The `else` branch expression may only be an `If` or `Block` | |
480 | /// expression, not any of the other types of expression. | |
481 | /// | |
f035d41b | 482 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 483 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
484 | pub struct ExprIf #full { |
485 | pub attrs: Vec<Attribute>, | |
486 | pub if_token: Token![if], | |
487 | pub cond: Box<Expr>, | |
488 | pub then_branch: Block, | |
489 | pub else_branch: Option<(Token![else], Box<Expr>)>, | |
490 | } | |
491 | } | |
492 | ||
493 | ast_struct! { | |
494 | /// A square bracketed indexing expression: `vector[2]`. | |
495 | /// | |
f035d41b | 496 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 497 | /// `"full"` feature.* |
5869c6ff | 498 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
499 | pub struct ExprIndex { |
500 | pub attrs: Vec<Attribute>, | |
501 | pub expr: Box<Expr>, | |
502 | pub bracket_token: token::Bracket, | |
503 | pub index: Box<Expr>, | |
504 | } | |
505 | } | |
506 | ||
507 | ast_struct! { | |
508 | /// A `let` guard: `let Some(x) = opt`. | |
509 | /// | |
f035d41b | 510 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 511 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
512 | pub struct ExprLet #full { |
513 | pub attrs: Vec<Attribute>, | |
514 | pub let_token: Token![let], | |
515 | pub pat: Pat, | |
516 | pub eq_token: Token![=], | |
517 | pub expr: Box<Expr>, | |
518 | } | |
519 | } | |
520 | ||
521 | ast_struct! { | |
522 | /// A literal in place of an expression: `1`, `"foo"`. | |
523 | /// | |
f035d41b | 524 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 525 | /// `"full"` feature.* |
5869c6ff | 526 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
527 | pub struct ExprLit { |
528 | pub attrs: Vec<Attribute>, | |
529 | pub lit: Lit, | |
530 | } | |
531 | } | |
532 | ||
533 | ast_struct! { | |
534 | /// Conditionless loop: `loop { ... }`. | |
535 | /// | |
f035d41b | 536 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 537 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
538 | pub struct ExprLoop #full { |
539 | pub attrs: Vec<Attribute>, | |
540 | pub label: Option<Label>, | |
541 | pub loop_token: Token![loop], | |
542 | pub body: Block, | |
543 | } | |
544 | } | |
545 | ||
546 | ast_struct! { | |
547 | /// A macro invocation expression: `format!("{}", q)`. | |
548 | /// | |
f035d41b | 549 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 550 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
551 | pub struct ExprMacro #full { |
552 | pub attrs: Vec<Attribute>, | |
553 | pub mac: Macro, | |
554 | } | |
555 | } | |
556 | ||
557 | ast_struct! { | |
558 | /// A `match` expression: `match n { Some(n) => {}, None => {} }`. | |
559 | /// | |
f035d41b | 560 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 561 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
562 | pub struct ExprMatch #full { |
563 | pub attrs: Vec<Attribute>, | |
564 | pub match_token: Token![match], | |
565 | pub expr: Box<Expr>, | |
566 | pub brace_token: token::Brace, | |
567 | pub arms: Vec<Arm>, | |
568 | } | |
569 | } | |
570 | ||
571 | ast_struct! { | |
572 | /// A method call expression: `x.foo::<T>(a, b)`. | |
573 | /// | |
f035d41b | 574 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 575 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
576 | pub struct ExprMethodCall #full { |
577 | pub attrs: Vec<Attribute>, | |
578 | pub receiver: Box<Expr>, | |
579 | pub dot_token: Token![.], | |
580 | pub method: Ident, | |
581 | pub turbofish: Option<MethodTurbofish>, | |
582 | pub paren_token: token::Paren, | |
583 | pub args: Punctuated<Expr, Token![,]>, | |
584 | } | |
585 | } | |
586 | ||
587 | ast_struct! { | |
588 | /// A parenthesized expression: `(a + b)`. | |
589 | /// | |
f035d41b | 590 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 591 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
592 | pub struct ExprParen { |
593 | pub attrs: Vec<Attribute>, | |
594 | pub paren_token: token::Paren, | |
595 | pub expr: Box<Expr>, | |
596 | } | |
597 | } | |
598 | ||
599 | ast_struct! { | |
600 | /// A path like `std::mem::replace` possibly containing generic | |
601 | /// parameters and a qualified self-type. | |
602 | /// | |
603 | /// A plain identifier like `x` is a path of length 1. | |
604 | /// | |
f035d41b | 605 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 606 | /// `"full"` feature.* |
5869c6ff | 607 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
608 | pub struct ExprPath { |
609 | pub attrs: Vec<Attribute>, | |
610 | pub qself: Option<QSelf>, | |
611 | pub path: Path, | |
612 | } | |
613 | } | |
614 | ||
615 | ast_struct! { | |
616 | /// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`. | |
617 | /// | |
f035d41b | 618 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 619 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
620 | pub struct ExprRange #full { |
621 | pub attrs: Vec<Attribute>, | |
622 | pub from: Option<Box<Expr>>, | |
623 | pub limits: RangeLimits, | |
624 | pub to: Option<Box<Expr>>, | |
625 | } | |
626 | } | |
627 | ||
628 | ast_struct! { | |
629 | /// A referencing operation: `&a` or `&mut a`. | |
630 | /// | |
f035d41b | 631 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 632 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
633 | pub struct ExprReference #full { |
634 | pub attrs: Vec<Attribute>, | |
635 | pub and_token: Token![&], | |
636 | pub raw: Reserved, | |
637 | pub mutability: Option<Token![mut]>, | |
638 | pub expr: Box<Expr>, | |
639 | } | |
640 | } | |
641 | ||
642 | ast_struct! { | |
643 | /// An array literal constructed from one repeated element: `[0u8; N]`. | |
644 | /// | |
f035d41b | 645 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 646 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
647 | pub struct ExprRepeat #full { |
648 | pub attrs: Vec<Attribute>, | |
649 | pub bracket_token: token::Bracket, | |
650 | pub expr: Box<Expr>, | |
651 | pub semi_token: Token![;], | |
652 | pub len: Box<Expr>, | |
653 | } | |
654 | } | |
655 | ||
656 | ast_struct! { | |
657 | /// A `return`, with an optional value to be returned. | |
658 | /// | |
f035d41b | 659 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 660 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
661 | pub struct ExprReturn #full { |
662 | pub attrs: Vec<Attribute>, | |
663 | pub return_token: Token![return], | |
664 | pub expr: Option<Box<Expr>>, | |
665 | } | |
666 | } | |
667 | ||
668 | ast_struct! { | |
669 | /// A struct literal expression: `Point { x: 1, y: 1 }`. | |
670 | /// | |
671 | /// The `rest` provides the value of the remaining fields as in `S { a: | |
672 | /// 1, b: 1, ..rest }`. | |
673 | /// | |
f035d41b | 674 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 675 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
676 | pub struct ExprStruct #full { |
677 | pub attrs: Vec<Attribute>, | |
678 | pub path: Path, | |
679 | pub brace_token: token::Brace, | |
680 | pub fields: Punctuated<FieldValue, Token![,]>, | |
681 | pub dot2_token: Option<Token![..]>, | |
682 | pub rest: Option<Box<Expr>>, | |
683 | } | |
684 | } | |
685 | ||
686 | ast_struct! { | |
687 | /// A try-expression: `expr?`. | |
688 | /// | |
f035d41b | 689 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 690 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
691 | pub struct ExprTry #full { |
692 | pub attrs: Vec<Attribute>, | |
693 | pub expr: Box<Expr>, | |
694 | pub question_token: Token![?], | |
695 | } | |
696 | } | |
697 | ||
698 | ast_struct! { | |
699 | /// A try block: `try { ... }`. | |
700 | /// | |
f035d41b | 701 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 702 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
703 | pub struct ExprTryBlock #full { |
704 | pub attrs: Vec<Attribute>, | |
705 | pub try_token: Token![try], | |
706 | pub block: Block, | |
707 | } | |
708 | } | |
709 | ||
710 | ast_struct! { | |
711 | /// A tuple expression: `(a, b, c, d)`. | |
712 | /// | |
f035d41b | 713 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 714 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
715 | pub struct ExprTuple #full { |
716 | pub attrs: Vec<Attribute>, | |
717 | pub paren_token: token::Paren, | |
718 | pub elems: Punctuated<Expr, Token![,]>, | |
719 | } | |
720 | } | |
721 | ||
722 | ast_struct! { | |
723 | /// A type ascription expression: `foo: f64`. | |
724 | /// | |
f035d41b | 725 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 726 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
727 | pub struct ExprType #full { |
728 | pub attrs: Vec<Attribute>, | |
729 | pub expr: Box<Expr>, | |
730 | pub colon_token: Token![:], | |
731 | pub ty: Box<Type>, | |
732 | } | |
733 | } | |
734 | ||
735 | ast_struct! { | |
736 | /// A unary operation: `!x`, `*x`. | |
737 | /// | |
f035d41b | 738 | /// *This type is available only if Syn is built with the `"derive"` or |
e74abb32 | 739 | /// `"full"` feature.* |
5869c6ff | 740 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
e74abb32 XL |
741 | pub struct ExprUnary { |
742 | pub attrs: Vec<Attribute>, | |
743 | pub op: UnOp, | |
744 | pub expr: Box<Expr>, | |
745 | } | |
746 | } | |
747 | ||
748 | ast_struct! { | |
749 | /// An unsafe block: `unsafe { ... }`. | |
750 | /// | |
f035d41b | 751 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 752 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
753 | pub struct ExprUnsafe #full { |
754 | pub attrs: Vec<Attribute>, | |
755 | pub unsafe_token: Token![unsafe], | |
756 | pub block: Block, | |
757 | } | |
758 | } | |
759 | ||
760 | ast_struct! { | |
761 | /// A while loop: `while expr { ... }`. | |
762 | /// | |
f035d41b | 763 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 764 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
765 | pub struct ExprWhile #full { |
766 | pub attrs: Vec<Attribute>, | |
767 | pub label: Option<Label>, | |
768 | pub while_token: Token![while], | |
769 | pub cond: Box<Expr>, | |
770 | pub body: Block, | |
771 | } | |
772 | } | |
773 | ||
774 | ast_struct! { | |
775 | /// A yield expression: `yield expr`. | |
776 | /// | |
f035d41b | 777 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 778 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
779 | pub struct ExprYield #full { |
780 | pub attrs: Vec<Attribute>, | |
781 | pub yield_token: Token![yield], | |
782 | pub expr: Option<Box<Expr>>, | |
783 | } | |
784 | } | |
785 | ||
e74abb32 XL |
786 | impl Expr { |
787 | #[cfg(all(feature = "parsing", feature = "full"))] | |
788 | pub(crate) fn replace_attrs(&mut self, new: Vec<Attribute>) -> Vec<Attribute> { | |
789 | match self { | |
790 | Expr::Box(ExprBox { attrs, .. }) | |
791 | | Expr::Array(ExprArray { attrs, .. }) | |
792 | | Expr::Call(ExprCall { attrs, .. }) | |
793 | | Expr::MethodCall(ExprMethodCall { attrs, .. }) | |
794 | | Expr::Tuple(ExprTuple { attrs, .. }) | |
795 | | Expr::Binary(ExprBinary { attrs, .. }) | |
796 | | Expr::Unary(ExprUnary { attrs, .. }) | |
797 | | Expr::Lit(ExprLit { attrs, .. }) | |
798 | | Expr::Cast(ExprCast { attrs, .. }) | |
799 | | Expr::Type(ExprType { attrs, .. }) | |
800 | | Expr::Let(ExprLet { attrs, .. }) | |
801 | | Expr::If(ExprIf { attrs, .. }) | |
802 | | Expr::While(ExprWhile { attrs, .. }) | |
803 | | Expr::ForLoop(ExprForLoop { attrs, .. }) | |
804 | | Expr::Loop(ExprLoop { attrs, .. }) | |
805 | | Expr::Match(ExprMatch { attrs, .. }) | |
806 | | Expr::Closure(ExprClosure { attrs, .. }) | |
807 | | Expr::Unsafe(ExprUnsafe { attrs, .. }) | |
808 | | Expr::Block(ExprBlock { attrs, .. }) | |
809 | | Expr::Assign(ExprAssign { attrs, .. }) | |
810 | | Expr::AssignOp(ExprAssignOp { attrs, .. }) | |
811 | | Expr::Field(ExprField { attrs, .. }) | |
812 | | Expr::Index(ExprIndex { attrs, .. }) | |
813 | | Expr::Range(ExprRange { attrs, .. }) | |
814 | | Expr::Path(ExprPath { attrs, .. }) | |
815 | | Expr::Reference(ExprReference { attrs, .. }) | |
816 | | Expr::Break(ExprBreak { attrs, .. }) | |
817 | | Expr::Continue(ExprContinue { attrs, .. }) | |
818 | | Expr::Return(ExprReturn { attrs, .. }) | |
819 | | Expr::Macro(ExprMacro { attrs, .. }) | |
820 | | Expr::Struct(ExprStruct { attrs, .. }) | |
821 | | Expr::Repeat(ExprRepeat { attrs, .. }) | |
822 | | Expr::Paren(ExprParen { attrs, .. }) | |
823 | | Expr::Group(ExprGroup { attrs, .. }) | |
824 | | Expr::Try(ExprTry { attrs, .. }) | |
825 | | Expr::Async(ExprAsync { attrs, .. }) | |
826 | | Expr::Await(ExprAwait { attrs, .. }) | |
827 | | Expr::TryBlock(ExprTryBlock { attrs, .. }) | |
828 | | Expr::Yield(ExprYield { attrs, .. }) => mem::replace(attrs, new), | |
829 | Expr::Verbatim(_) => Vec::new(), | |
6a06907d XL |
830 | |
831 | #[cfg(test)] | |
832 | Expr::__TestExhaustive(_) => unimplemented!(), | |
833 | #[cfg(not(test))] | |
834 | _ => unreachable!(), | |
e74abb32 XL |
835 | } |
836 | } | |
837 | } | |
838 | ||
839 | ast_enum! { | |
840 | /// A struct or tuple struct field accessed in a struct literal or field | |
841 | /// expression. | |
842 | /// | |
f035d41b | 843 | /// *This type is available only if Syn is built with the `"derive"` or `"full"` |
e74abb32 | 844 | /// feature.* |
5869c6ff | 845 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
1b1a35ee | 846 | pub enum Member { |
e74abb32 XL |
847 | /// A named field like `self.x`. |
848 | Named(Ident), | |
849 | /// An unnamed field like `self.0`. | |
850 | Unnamed(Index), | |
851 | } | |
852 | } | |
853 | ||
1b1a35ee XL |
854 | impl Eq for Member {} |
855 | ||
856 | impl PartialEq for Member { | |
857 | fn eq(&self, other: &Self) -> bool { | |
858 | match (self, other) { | |
859 | (Member::Named(this), Member::Named(other)) => this == other, | |
860 | (Member::Unnamed(this), Member::Unnamed(other)) => this == other, | |
861 | _ => false, | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | impl Hash for Member { | |
867 | fn hash<H: Hasher>(&self, state: &mut H) { | |
868 | match self { | |
869 | Member::Named(m) => m.hash(state), | |
870 | Member::Unnamed(m) => m.hash(state), | |
871 | } | |
872 | } | |
873 | } | |
874 | ||
60c5eb7d XL |
875 | #[cfg(feature = "printing")] |
876 | impl IdentFragment for Member { | |
877 | fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { | |
878 | match self { | |
879 | Member::Named(m) => Display::fmt(m, formatter), | |
880 | Member::Unnamed(m) => Display::fmt(&m.index, formatter), | |
881 | } | |
882 | } | |
883 | ||
884 | fn span(&self) -> Option<Span> { | |
885 | match self { | |
886 | Member::Named(m) => Some(m.span()), | |
887 | Member::Unnamed(m) => Some(m.span), | |
888 | } | |
889 | } | |
890 | } | |
891 | ||
e74abb32 XL |
892 | ast_struct! { |
893 | /// The index of an unnamed tuple struct field. | |
894 | /// | |
f035d41b | 895 | /// *This type is available only if Syn is built with the `"derive"` or `"full"` |
e74abb32 | 896 | /// feature.* |
5869c6ff | 897 | #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))] |
1b1a35ee | 898 | pub struct Index { |
e74abb32 XL |
899 | pub index: u32, |
900 | pub span: Span, | |
901 | } | |
902 | } | |
903 | ||
904 | impl From<usize> for Index { | |
905 | fn from(index: usize) -> Index { | |
906 | assert!(index < u32::max_value() as usize); | |
907 | Index { | |
908 | index: index as u32, | |
909 | span: Span::call_site(), | |
910 | } | |
911 | } | |
912 | } | |
913 | ||
e74abb32 XL |
914 | impl Eq for Index {} |
915 | ||
e74abb32 XL |
916 | impl PartialEq for Index { |
917 | fn eq(&self, other: &Self) -> bool { | |
918 | self.index == other.index | |
919 | } | |
920 | } | |
921 | ||
e74abb32 XL |
922 | impl Hash for Index { |
923 | fn hash<H: Hasher>(&self, state: &mut H) { | |
924 | self.index.hash(state); | |
925 | } | |
926 | } | |
927 | ||
60c5eb7d XL |
928 | #[cfg(feature = "printing")] |
929 | impl IdentFragment for Index { | |
930 | fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { | |
931 | Display::fmt(&self.index, formatter) | |
932 | } | |
933 | ||
934 | fn span(&self) -> Option<Span> { | |
935 | Some(self.span) | |
936 | } | |
937 | } | |
938 | ||
e74abb32 XL |
939 | #[cfg(feature = "full")] |
940 | ast_struct! { | |
941 | /// The `::<>` explicit type parameters passed to a method call: | |
942 | /// `parse::<u64>()`. | |
943 | /// | |
f035d41b | 944 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 945 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
946 | pub struct MethodTurbofish { |
947 | pub colon2_token: Token![::], | |
948 | pub lt_token: Token![<], | |
949 | pub args: Punctuated<GenericMethodArgument, Token![,]>, | |
950 | pub gt_token: Token![>], | |
951 | } | |
952 | } | |
953 | ||
954 | #[cfg(feature = "full")] | |
955 | ast_enum! { | |
956 | /// An individual generic argument to a method, like `T`. | |
957 | /// | |
f035d41b | 958 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 959 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
960 | pub enum GenericMethodArgument { |
961 | /// A type argument. | |
962 | Type(Type), | |
963 | /// A const expression. Must be inside of a block. | |
964 | /// | |
965 | /// NOTE: Identity expressions are represented as Type arguments, as | |
966 | /// they are indistinguishable syntactically. | |
967 | Const(Expr), | |
968 | } | |
969 | } | |
970 | ||
971 | #[cfg(feature = "full")] | |
972 | ast_struct! { | |
973 | /// A field-value pair in a struct literal. | |
974 | /// | |
f035d41b | 975 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 976 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
977 | pub struct FieldValue { |
978 | /// Attributes tagged on the field. | |
979 | pub attrs: Vec<Attribute>, | |
980 | ||
981 | /// Name or index of the field. | |
982 | pub member: Member, | |
983 | ||
984 | /// The colon in `Struct { x: x }`. If written in shorthand like | |
985 | /// `Struct { x }`, there is no colon. | |
986 | pub colon_token: Option<Token![:]>, | |
987 | ||
988 | /// Value of the field. | |
989 | pub expr: Expr, | |
990 | } | |
991 | } | |
992 | ||
993 | #[cfg(feature = "full")] | |
994 | ast_struct! { | |
995 | /// A lifetime labeling a `for`, `while`, or `loop`. | |
996 | /// | |
f035d41b | 997 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 998 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
999 | pub struct Label { |
1000 | pub name: Lifetime, | |
1001 | pub colon_token: Token![:], | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | #[cfg(feature = "full")] | |
1006 | ast_struct! { | |
1007 | /// One arm of a `match` expression: `0...10 => { return true; }`. | |
1008 | /// | |
1009 | /// As in: | |
1010 | /// | |
1011 | /// ``` | |
1012 | /// # fn f() -> bool { | |
1013 | /// # let n = 0; | |
1014 | /// match n { | |
1015 | /// 0...10 => { | |
1016 | /// return true; | |
1017 | /// } | |
1018 | /// // ... | |
1019 | /// # _ => {} | |
1020 | /// } | |
1021 | /// # false | |
1022 | /// # } | |
1023 | /// ``` | |
1024 | /// | |
f035d41b | 1025 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 1026 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
1027 | pub struct Arm { |
1028 | pub attrs: Vec<Attribute>, | |
1029 | pub pat: Pat, | |
1030 | pub guard: Option<(Token![if], Box<Expr>)>, | |
1031 | pub fat_arrow_token: Token![=>], | |
1032 | pub body: Box<Expr>, | |
1033 | pub comma: Option<Token![,]>, | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | #[cfg(feature = "full")] | |
1038 | ast_enum! { | |
1039 | /// Limit types of a range, inclusive or exclusive. | |
1040 | /// | |
f035d41b | 1041 | /// *This type is available only if Syn is built with the `"full"` feature.* |
5869c6ff | 1042 | #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))] |
e74abb32 XL |
1043 | pub enum RangeLimits { |
1044 | /// Inclusive at the beginning, exclusive at the end. | |
1045 | HalfOpen(Token![..]), | |
1046 | /// Inclusive at the beginning and end. | |
1047 | Closed(Token![..=]), | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | #[cfg(any(feature = "parsing", feature = "printing"))] | |
1052 | #[cfg(feature = "full")] | |
1053 | pub(crate) fn requires_terminator(expr: &Expr) -> bool { | |
f035d41b | 1054 | // see https://github.com/rust-lang/rust/blob/2679c38fc/src/librustc_ast/util/classify.rs#L7-L25 |
e74abb32 XL |
1055 | match *expr { |
1056 | Expr::Unsafe(..) | |
1057 | | Expr::Block(..) | |
1058 | | Expr::If(..) | |
1059 | | Expr::Match(..) | |
1060 | | Expr::While(..) | |
1061 | | Expr::Loop(..) | |
1062 | | Expr::ForLoop(..) | |
1063 | | Expr::Async(..) | |
1064 | | Expr::TryBlock(..) => false, | |
1065 | _ => true, | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | #[cfg(feature = "parsing")] | |
1070 | pub(crate) mod parsing { | |
1071 | use super::*; | |
e74abb32 XL |
1072 | use crate::parse::{Parse, ParseStream, Result}; |
1073 | use crate::path; | |
5869c6ff XL |
1074 | #[cfg(feature = "full")] |
1075 | use proc_macro2::TokenTree; | |
1b1a35ee | 1076 | use std::cmp::Ordering; |
e74abb32 | 1077 | |
f035d41b XL |
1078 | crate::custom_keyword!(raw); |
1079 | ||
e74abb32 XL |
1080 | // When we're parsing expressions which occur before blocks, like in an if |
1081 | // statement's condition, we cannot parse a struct literal. | |
1082 | // | |
1083 | // Struct literals are ambiguous in certain positions | |
1084 | // https://github.com/rust-lang/rfcs/pull/92 | |
e74abb32 XL |
1085 | pub struct AllowStruct(bool); |
1086 | ||
e74abb32 XL |
1087 | enum Precedence { |
1088 | Any, | |
1089 | Assign, | |
1090 | Range, | |
1091 | Or, | |
1092 | And, | |
1093 | Compare, | |
1094 | BitOr, | |
1095 | BitXor, | |
1096 | BitAnd, | |
1097 | Shift, | |
1098 | Arithmetic, | |
1099 | Term, | |
1100 | Cast, | |
1101 | } | |
1102 | ||
1103 | impl Precedence { | |
1104 | fn of(op: &BinOp) -> Self { | |
1105 | match *op { | |
1106 | BinOp::Add(_) | BinOp::Sub(_) => Precedence::Arithmetic, | |
1107 | BinOp::Mul(_) | BinOp::Div(_) | BinOp::Rem(_) => Precedence::Term, | |
1108 | BinOp::And(_) => Precedence::And, | |
1109 | BinOp::Or(_) => Precedence::Or, | |
1110 | BinOp::BitXor(_) => Precedence::BitXor, | |
1111 | BinOp::BitAnd(_) => Precedence::BitAnd, | |
1112 | BinOp::BitOr(_) => Precedence::BitOr, | |
1113 | BinOp::Shl(_) | BinOp::Shr(_) => Precedence::Shift, | |
1114 | BinOp::Eq(_) | |
1115 | | BinOp::Lt(_) | |
1116 | | BinOp::Le(_) | |
1117 | | BinOp::Ne(_) | |
1118 | | BinOp::Ge(_) | |
1119 | | BinOp::Gt(_) => Precedence::Compare, | |
1120 | BinOp::AddEq(_) | |
1121 | | BinOp::SubEq(_) | |
1122 | | BinOp::MulEq(_) | |
1123 | | BinOp::DivEq(_) | |
1124 | | BinOp::RemEq(_) | |
1125 | | BinOp::BitXorEq(_) | |
1126 | | BinOp::BitAndEq(_) | |
1127 | | BinOp::BitOrEq(_) | |
1128 | | BinOp::ShlEq(_) | |
1129 | | BinOp::ShrEq(_) => Precedence::Assign, | |
1130 | } | |
1131 | } | |
1132 | } | |
1133 | ||
5869c6ff | 1134 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
1135 | impl Parse for Expr { |
1136 | fn parse(input: ParseStream) -> Result<Self> { | |
1137 | ambiguous_expr(input, AllowStruct(true)) | |
1138 | } | |
1139 | } | |
1140 | ||
f035d41b XL |
1141 | impl Expr { |
1142 | /// An alternative to the primary `Expr::parse` parser (from the | |
1143 | /// [`Parse`] trait) for ambiguous syntactic positions in which a | |
1144 | /// trailing brace should not be taken as part of the expression. | |
1145 | /// | |
1146 | /// Rust grammar has an ambiguity where braces sometimes turn a path | |
1147 | /// expression into a struct initialization and sometimes do not. In the | |
1148 | /// following code, the expression `S {}` is one expression. Presumably | |
1149 | /// there is an empty struct `struct S {}` defined somewhere which it is | |
1150 | /// instantiating. | |
1151 | /// | |
1152 | /// ``` | |
1153 | /// # struct S; | |
1154 | /// # impl std::ops::Deref for S { | |
1155 | /// # type Target = bool; | |
1156 | /// # fn deref(&self) -> &Self::Target { | |
1157 | /// # &true | |
1158 | /// # } | |
1159 | /// # } | |
1160 | /// let _ = *S {}; | |
1161 | /// | |
1162 | /// // parsed by rustc as: `*(S {})` | |
1163 | /// ``` | |
1164 | /// | |
1165 | /// We would want to parse the above using `Expr::parse` after the `=` | |
1166 | /// token. | |
1167 | /// | |
1168 | /// But in the following, `S {}` is *not* a struct init expression. | |
1169 | /// | |
1170 | /// ``` | |
1171 | /// # const S: &bool = &true; | |
1172 | /// if *S {} {} | |
1173 | /// | |
1174 | /// // parsed by rustc as: | |
1175 | /// // | |
1176 | /// // if (*S) { | |
1177 | /// // /* empty block */ | |
1178 | /// // } | |
1179 | /// // { | |
1180 | /// // /* another empty block */ | |
1181 | /// // } | |
1182 | /// ``` | |
1183 | /// | |
1184 | /// For that reason we would want to parse if-conditions using | |
1185 | /// `Expr::parse_without_eager_brace` after the `if` token. Same for | |
1186 | /// similar syntactic positions such as the condition expr after a | |
1187 | /// `while` token or the expr at the top of a `match`. | |
1188 | /// | |
1189 | /// The Rust grammar's choices around which way this ambiguity is | |
1190 | /// resolved at various syntactic positions is fairly arbitrary. Really | |
1191 | /// either parse behavior could work in most positions, and language | |
1192 | /// designers just decide each case based on which is more likely to be | |
1193 | /// what the programmer had in mind most of the time. | |
1194 | /// | |
1195 | /// ``` | |
1196 | /// # struct S; | |
1197 | /// # fn doc() -> S { | |
1198 | /// if return S {} {} | |
1199 | /// # unreachable!() | |
1200 | /// # } | |
1201 | /// | |
1202 | /// // parsed by rustc as: | |
1203 | /// // | |
1204 | /// // if (return (S {})) { | |
1205 | /// // } | |
1206 | /// // | |
1207 | /// // but could equally well have been this other arbitrary choice: | |
1208 | /// // | |
1209 | /// // if (return S) { | |
1210 | /// // } | |
1211 | /// // {} | |
1212 | /// ``` | |
1213 | /// | |
1214 | /// Note the grammar ambiguity on trailing braces is distinct from | |
1215 | /// precedence and is not captured by assigning a precedence level to | |
1216 | /// the braced struct init expr in relation to other operators. This can | |
1217 | /// be illustrated by `return 0..S {}` vs `match 0..S {}`. The former | |
1218 | /// parses as `return (0..(S {}))` implying tighter precedence for | |
1219 | /// struct init than `..`, while the latter parses as `match (0..S) {}` | |
1220 | /// implying tighter precedence for `..` than struct init, a | |
1221 | /// contradiction. | |
1222 | #[cfg(feature = "full")] | |
5869c6ff | 1223 | #[cfg_attr(doc_cfg, doc(cfg(all(feature = "full", feature = "parsing"))))] |
f035d41b XL |
1224 | pub fn parse_without_eager_brace(input: ParseStream) -> Result<Expr> { |
1225 | ambiguous_expr(input, AllowStruct(false)) | |
1226 | } | |
e74abb32 XL |
1227 | } |
1228 | ||
1b1a35ee XL |
1229 | impl Copy for AllowStruct {} |
1230 | ||
1231 | impl Clone for AllowStruct { | |
1232 | fn clone(&self) -> Self { | |
1233 | *self | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | impl Copy for Precedence {} | |
1238 | ||
1239 | impl Clone for Precedence { | |
1240 | fn clone(&self) -> Self { | |
1241 | *self | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | impl PartialEq for Precedence { | |
1246 | fn eq(&self, other: &Self) -> bool { | |
1247 | *self as u8 == *other as u8 | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | impl PartialOrd for Precedence { | |
1252 | fn partial_cmp(&self, other: &Self) -> Option<Ordering> { | |
1253 | let this = *self as u8; | |
1254 | let other = *other as u8; | |
1255 | Some(this.cmp(&other)) | |
1256 | } | |
1257 | } | |
1258 | ||
e74abb32 XL |
1259 | #[cfg(feature = "full")] |
1260 | fn parse_expr( | |
1261 | input: ParseStream, | |
1262 | mut lhs: Expr, | |
1263 | allow_struct: AllowStruct, | |
1264 | base: Precedence, | |
1265 | ) -> Result<Expr> { | |
1266 | loop { | |
1267 | if input | |
1268 | .fork() | |
1269 | .parse::<BinOp>() | |
1270 | .ok() | |
1271 | .map_or(false, |op| Precedence::of(&op) >= base) | |
1272 | { | |
1273 | let op: BinOp = input.parse()?; | |
1274 | let precedence = Precedence::of(&op); | |
1275 | let mut rhs = unary_expr(input, allow_struct)?; | |
1276 | loop { | |
1277 | let next = peek_precedence(input); | |
1278 | if next > precedence || next == precedence && precedence == Precedence::Assign { | |
1279 | rhs = parse_expr(input, rhs, allow_struct, next)?; | |
1280 | } else { | |
1281 | break; | |
1282 | } | |
1283 | } | |
1284 | lhs = if precedence == Precedence::Assign { | |
1285 | Expr::AssignOp(ExprAssignOp { | |
1286 | attrs: Vec::new(), | |
1287 | left: Box::new(lhs), | |
1288 | op, | |
1289 | right: Box::new(rhs), | |
1290 | }) | |
1291 | } else { | |
1292 | Expr::Binary(ExprBinary { | |
1293 | attrs: Vec::new(), | |
1294 | left: Box::new(lhs), | |
1295 | op, | |
1296 | right: Box::new(rhs), | |
1297 | }) | |
1298 | }; | |
1299 | } else if Precedence::Assign >= base | |
1300 | && input.peek(Token![=]) | |
1301 | && !input.peek(Token![==]) | |
1302 | && !input.peek(Token![=>]) | |
1303 | { | |
1304 | let eq_token: Token![=] = input.parse()?; | |
1305 | let mut rhs = unary_expr(input, allow_struct)?; | |
1306 | loop { | |
1307 | let next = peek_precedence(input); | |
1308 | if next >= Precedence::Assign { | |
1309 | rhs = parse_expr(input, rhs, allow_struct, next)?; | |
1310 | } else { | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | lhs = Expr::Assign(ExprAssign { | |
1315 | attrs: Vec::new(), | |
1316 | left: Box::new(lhs), | |
1317 | eq_token, | |
1318 | right: Box::new(rhs), | |
1319 | }); | |
1320 | } else if Precedence::Range >= base && input.peek(Token![..]) { | |
1321 | let limits: RangeLimits = input.parse()?; | |
1322 | let rhs = if input.is_empty() | |
1323 | || input.peek(Token![,]) | |
1324 | || input.peek(Token![;]) | |
1325 | || !allow_struct.0 && input.peek(token::Brace) | |
1326 | { | |
1327 | None | |
1328 | } else { | |
1329 | let mut rhs = unary_expr(input, allow_struct)?; | |
1330 | loop { | |
1331 | let next = peek_precedence(input); | |
1332 | if next > Precedence::Range { | |
1333 | rhs = parse_expr(input, rhs, allow_struct, next)?; | |
1334 | } else { | |
1335 | break; | |
1336 | } | |
1337 | } | |
1338 | Some(rhs) | |
1339 | }; | |
1340 | lhs = Expr::Range(ExprRange { | |
1341 | attrs: Vec::new(), | |
1342 | from: Some(Box::new(lhs)), | |
1343 | limits, | |
1344 | to: rhs.map(Box::new), | |
1345 | }); | |
1346 | } else if Precedence::Cast >= base && input.peek(Token![as]) { | |
1347 | let as_token: Token![as] = input.parse()?; | |
1348 | let ty = input.call(Type::without_plus)?; | |
1349 | lhs = Expr::Cast(ExprCast { | |
1350 | attrs: Vec::new(), | |
1351 | expr: Box::new(lhs), | |
1352 | as_token, | |
1353 | ty: Box::new(ty), | |
1354 | }); | |
1355 | } else if Precedence::Cast >= base && input.peek(Token![:]) && !input.peek(Token![::]) { | |
1356 | let colon_token: Token![:] = input.parse()?; | |
1357 | let ty = input.call(Type::without_plus)?; | |
1358 | lhs = Expr::Type(ExprType { | |
1359 | attrs: Vec::new(), | |
1360 | expr: Box::new(lhs), | |
1361 | colon_token, | |
1362 | ty: Box::new(ty), | |
1363 | }); | |
1364 | } else { | |
1365 | break; | |
1366 | } | |
1367 | } | |
1368 | Ok(lhs) | |
1369 | } | |
1370 | ||
1371 | #[cfg(not(feature = "full"))] | |
1372 | fn parse_expr( | |
1373 | input: ParseStream, | |
1374 | mut lhs: Expr, | |
1375 | allow_struct: AllowStruct, | |
1376 | base: Precedence, | |
1377 | ) -> Result<Expr> { | |
1378 | loop { | |
1379 | if input | |
1380 | .fork() | |
1381 | .parse::<BinOp>() | |
1382 | .ok() | |
1383 | .map_or(false, |op| Precedence::of(&op) >= base) | |
1384 | { | |
1385 | let op: BinOp = input.parse()?; | |
1386 | let precedence = Precedence::of(&op); | |
1387 | let mut rhs = unary_expr(input, allow_struct)?; | |
1388 | loop { | |
1389 | let next = peek_precedence(input); | |
1390 | if next > precedence || next == precedence && precedence == Precedence::Assign { | |
1391 | rhs = parse_expr(input, rhs, allow_struct, next)?; | |
1392 | } else { | |
1393 | break; | |
1394 | } | |
1395 | } | |
1396 | lhs = Expr::Binary(ExprBinary { | |
1397 | attrs: Vec::new(), | |
1398 | left: Box::new(lhs), | |
1399 | op, | |
1400 | right: Box::new(rhs), | |
1401 | }); | |
1402 | } else if Precedence::Cast >= base && input.peek(Token![as]) { | |
1403 | let as_token: Token![as] = input.parse()?; | |
1404 | let ty = input.call(Type::without_plus)?; | |
1405 | lhs = Expr::Cast(ExprCast { | |
1406 | attrs: Vec::new(), | |
1407 | expr: Box::new(lhs), | |
1408 | as_token, | |
1409 | ty: Box::new(ty), | |
1410 | }); | |
1411 | } else { | |
1412 | break; | |
1413 | } | |
1414 | } | |
1415 | Ok(lhs) | |
1416 | } | |
1417 | ||
1418 | fn peek_precedence(input: ParseStream) -> Precedence { | |
1419 | if let Ok(op) = input.fork().parse() { | |
1420 | Precedence::of(&op) | |
1421 | } else if input.peek(Token![=]) && !input.peek(Token![=>]) { | |
1422 | Precedence::Assign | |
1423 | } else if input.peek(Token![..]) { | |
1424 | Precedence::Range | |
1425 | } else if input.peek(Token![as]) || input.peek(Token![:]) && !input.peek(Token![::]) { | |
1426 | Precedence::Cast | |
1427 | } else { | |
1428 | Precedence::Any | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | // Parse an arbitrary expression. | |
1433 | fn ambiguous_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
1434 | let lhs = unary_expr(input, allow_struct)?; | |
1435 | parse_expr(input, lhs, allow_struct, Precedence::Any) | |
1436 | } | |
1437 | ||
f035d41b XL |
1438 | #[cfg(feature = "full")] |
1439 | fn expr_attrs(input: ParseStream) -> Result<Vec<Attribute>> { | |
1440 | let mut attrs = Vec::new(); | |
1441 | loop { | |
1442 | if input.peek(token::Group) { | |
1443 | let ahead = input.fork(); | |
1444 | let group = crate::group::parse_group(&ahead)?; | |
1445 | if !group.content.peek(Token![#]) || group.content.peek2(Token![!]) { | |
1446 | break; | |
1447 | } | |
1448 | let attr = group.content.call(attr::parsing::single_parse_outer)?; | |
1449 | if !group.content.is_empty() { | |
1450 | break; | |
1451 | } | |
1452 | attrs.push(attr); | |
1453 | } else if input.peek(Token![#]) { | |
1454 | attrs.push(input.call(attr::parsing::single_parse_outer)?); | |
1455 | } else { | |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | Ok(attrs) | |
1460 | } | |
1461 | ||
e74abb32 XL |
1462 | // <UnOp> <trailer> |
1463 | // & <trailer> | |
1464 | // &mut <trailer> | |
1465 | // box <trailer> | |
1466 | #[cfg(feature = "full")] | |
1467 | fn unary_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
f035d41b XL |
1468 | let begin = input.fork(); |
1469 | let attrs = input.call(expr_attrs)?; | |
1470 | if input.peek(Token![&]) { | |
1471 | let and_token: Token![&] = input.parse()?; | |
1472 | let raw: Option<raw> = | |
1473 | if input.peek(raw) && (input.peek2(Token![mut]) || input.peek2(Token![const])) { | |
1474 | Some(input.parse()?) | |
1475 | } else { | |
1476 | None | |
1477 | }; | |
1478 | let mutability: Option<Token![mut]> = input.parse()?; | |
1479 | if raw.is_some() && mutability.is_none() { | |
1480 | input.parse::<Token![const]>()?; | |
1481 | } | |
1482 | let expr = Box::new(unary_expr(input, allow_struct)?); | |
1483 | if raw.is_some() { | |
1484 | Ok(Expr::Verbatim(verbatim::between(begin, input))) | |
1485 | } else { | |
e74abb32 XL |
1486 | Ok(Expr::Reference(ExprReference { |
1487 | attrs, | |
f035d41b | 1488 | and_token, |
e74abb32 | 1489 | raw: Reserved::default(), |
f035d41b XL |
1490 | mutability, |
1491 | expr, | |
e74abb32 XL |
1492 | })) |
1493 | } | |
f035d41b XL |
1494 | } else if input.peek(Token![box]) { |
1495 | Ok(Expr::Box(ExprBox { | |
1496 | attrs, | |
1497 | box_token: input.parse()?, | |
1498 | expr: Box::new(unary_expr(input, allow_struct)?), | |
1499 | })) | |
1500 | } else if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) { | |
1501 | Ok(Expr::Unary(ExprUnary { | |
1502 | attrs, | |
1503 | op: input.parse()?, | |
1504 | expr: Box::new(unary_expr(input, allow_struct)?), | |
1505 | })) | |
e74abb32 | 1506 | } else { |
f035d41b | 1507 | trailer_expr(attrs, input, allow_struct) |
e74abb32 XL |
1508 | } |
1509 | } | |
1510 | ||
1511 | #[cfg(not(feature = "full"))] | |
1512 | fn unary_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
f035d41b | 1513 | if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) { |
e74abb32 | 1514 | Ok(Expr::Unary(ExprUnary { |
f035d41b | 1515 | attrs: Vec::new(), |
e74abb32 XL |
1516 | op: input.parse()?, |
1517 | expr: Box::new(unary_expr(input, allow_struct)?), | |
1518 | })) | |
1519 | } else { | |
1520 | trailer_expr(input, allow_struct) | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | // <atom> (..<args>) ... | |
1525 | // <atom> . <ident> (..<args>) ... | |
1526 | // <atom> . <ident> ... | |
1527 | // <atom> . <lit> ... | |
1528 | // <atom> [ <expr> ] ... | |
1529 | // <atom> ? ... | |
1530 | #[cfg(feature = "full")] | |
f035d41b XL |
1531 | fn trailer_expr( |
1532 | outer_attrs: Vec<Attribute>, | |
1533 | input: ParseStream, | |
1534 | allow_struct: AllowStruct, | |
1535 | ) -> Result<Expr> { | |
e74abb32 XL |
1536 | let atom = atom_expr(input, allow_struct)?; |
1537 | let mut e = trailer_helper(input, atom)?; | |
1538 | ||
1539 | let inner_attrs = e.replace_attrs(Vec::new()); | |
1540 | let attrs = private::attrs(outer_attrs, inner_attrs); | |
1541 | e.replace_attrs(attrs); | |
1542 | Ok(e) | |
1543 | } | |
1544 | ||
1545 | #[cfg(feature = "full")] | |
1546 | fn trailer_helper(input: ParseStream, mut e: Expr) -> Result<Expr> { | |
1547 | loop { | |
1548 | if input.peek(token::Paren) { | |
1549 | let content; | |
1550 | e = Expr::Call(ExprCall { | |
1551 | attrs: Vec::new(), | |
1552 | func: Box::new(e), | |
1553 | paren_token: parenthesized!(content in input), | |
1554 | args: content.parse_terminated(Expr::parse)?, | |
1555 | }); | |
1556 | } else if input.peek(Token![.]) && !input.peek(Token![..]) { | |
3dfed10e | 1557 | let mut dot_token: Token![.] = input.parse()?; |
e74abb32 | 1558 | |
f035d41b XL |
1559 | let await_token: Option<token::Await> = input.parse()?; |
1560 | if let Some(await_token) = await_token { | |
e74abb32 XL |
1561 | e = Expr::Await(ExprAwait { |
1562 | attrs: Vec::new(), | |
1563 | base: Box::new(e), | |
1564 | dot_token, | |
f035d41b | 1565 | await_token, |
e74abb32 XL |
1566 | }); |
1567 | continue; | |
1568 | } | |
1569 | ||
f035d41b XL |
1570 | let float_token: Option<LitFloat> = input.parse()?; |
1571 | if let Some(float_token) = float_token { | |
3dfed10e XL |
1572 | if multi_index(&mut e, &mut dot_token, float_token)? { |
1573 | continue; | |
1574 | } | |
f035d41b XL |
1575 | } |
1576 | ||
e74abb32 XL |
1577 | let member: Member = input.parse()?; |
1578 | let turbofish = if member.is_named() && input.peek(Token![::]) { | |
1579 | Some(MethodTurbofish { | |
1580 | colon2_token: input.parse()?, | |
1581 | lt_token: input.parse()?, | |
1582 | args: { | |
1583 | let mut args = Punctuated::new(); | |
1584 | loop { | |
1585 | if input.peek(Token![>]) { | |
1586 | break; | |
1587 | } | |
1588 | let value = input.call(generic_method_argument)?; | |
1589 | args.push_value(value); | |
1590 | if input.peek(Token![>]) { | |
1591 | break; | |
1592 | } | |
1593 | let punct = input.parse()?; | |
1594 | args.push_punct(punct); | |
1595 | } | |
1596 | args | |
1597 | }, | |
1598 | gt_token: input.parse()?, | |
1599 | }) | |
1600 | } else { | |
1601 | None | |
1602 | }; | |
1603 | ||
1604 | if turbofish.is_some() || input.peek(token::Paren) { | |
1605 | if let Member::Named(method) = member { | |
1606 | let content; | |
1607 | e = Expr::MethodCall(ExprMethodCall { | |
1608 | attrs: Vec::new(), | |
1609 | receiver: Box::new(e), | |
1610 | dot_token, | |
1611 | method, | |
1612 | turbofish, | |
1613 | paren_token: parenthesized!(content in input), | |
1614 | args: content.parse_terminated(Expr::parse)?, | |
1615 | }); | |
1616 | continue; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | e = Expr::Field(ExprField { | |
1621 | attrs: Vec::new(), | |
1622 | base: Box::new(e), | |
1623 | dot_token, | |
1624 | member, | |
1625 | }); | |
1626 | } else if input.peek(token::Bracket) { | |
1627 | let content; | |
1628 | e = Expr::Index(ExprIndex { | |
1629 | attrs: Vec::new(), | |
1630 | expr: Box::new(e), | |
1631 | bracket_token: bracketed!(content in input), | |
1632 | index: content.parse()?, | |
1633 | }); | |
1634 | } else if input.peek(Token![?]) { | |
1635 | e = Expr::Try(ExprTry { | |
1636 | attrs: Vec::new(), | |
1637 | expr: Box::new(e), | |
1638 | question_token: input.parse()?, | |
1639 | }); | |
1640 | } else { | |
1641 | break; | |
1642 | } | |
1643 | } | |
1644 | Ok(e) | |
1645 | } | |
1646 | ||
1647 | #[cfg(not(feature = "full"))] | |
1648 | fn trailer_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
1649 | let mut e = atom_expr(input, allow_struct)?; | |
1650 | ||
1651 | loop { | |
1652 | if input.peek(token::Paren) { | |
1653 | let content; | |
1654 | e = Expr::Call(ExprCall { | |
1655 | attrs: Vec::new(), | |
1656 | func: Box::new(e), | |
1657 | paren_token: parenthesized!(content in input), | |
1658 | args: content.parse_terminated(Expr::parse)?, | |
1659 | }); | |
1660 | } else if input.peek(Token![.]) && !input.peek(Token![..]) && !input.peek2(token::Await) | |
1661 | { | |
3dfed10e | 1662 | let mut dot_token: Token![.] = input.parse()?; |
f035d41b XL |
1663 | let float_token: Option<LitFloat> = input.parse()?; |
1664 | if let Some(float_token) = float_token { | |
3dfed10e XL |
1665 | if multi_index(&mut e, &mut dot_token, float_token)? { |
1666 | continue; | |
1667 | } | |
f035d41b | 1668 | } |
3dfed10e XL |
1669 | e = Expr::Field(ExprField { |
1670 | attrs: Vec::new(), | |
1671 | base: Box::new(e), | |
1672 | dot_token, | |
1673 | member: input.parse()?, | |
1674 | }); | |
e74abb32 XL |
1675 | } else if input.peek(token::Bracket) { |
1676 | let content; | |
1677 | e = Expr::Index(ExprIndex { | |
1678 | attrs: Vec::new(), | |
1679 | expr: Box::new(e), | |
1680 | bracket_token: bracketed!(content in input), | |
1681 | index: content.parse()?, | |
1682 | }); | |
1683 | } else { | |
1684 | break; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | Ok(e) | |
1689 | } | |
1690 | ||
1691 | // Parse all atomic expressions which don't have to worry about precedence | |
1692 | // interactions, as they are fully contained. | |
1693 | #[cfg(feature = "full")] | |
1694 | fn atom_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
f035d41b XL |
1695 | if input.peek(token::Group) |
1696 | && !input.peek2(Token![::]) | |
1697 | && !input.peek2(Token![!]) | |
1698 | && !input.peek2(token::Brace) | |
1699 | { | |
e74abb32 XL |
1700 | input.call(expr_group).map(Expr::Group) |
1701 | } else if input.peek(Lit) { | |
1702 | input.parse().map(Expr::Lit) | |
1703 | } else if input.peek(Token![async]) | |
1704 | && (input.peek2(token::Brace) || input.peek2(Token![move]) && input.peek3(token::Brace)) | |
1705 | { | |
1706 | input.call(expr_async).map(Expr::Async) | |
1707 | } else if input.peek(Token![try]) && input.peek2(token::Brace) { | |
1708 | input.call(expr_try_block).map(Expr::TryBlock) | |
1709 | } else if input.peek(Token![|]) | |
1710 | || input.peek(Token![async]) && (input.peek2(Token![|]) || input.peek2(Token![move])) | |
1711 | || input.peek(Token![static]) | |
1712 | || input.peek(Token![move]) | |
1713 | { | |
1714 | expr_closure(input, allow_struct).map(Expr::Closure) | |
1715 | } else if input.peek(Ident) | |
1716 | || input.peek(Token![::]) | |
1717 | || input.peek(Token![<]) | |
1718 | || input.peek(Token![self]) | |
1719 | || input.peek(Token![Self]) | |
1720 | || input.peek(Token![super]) | |
e74abb32 XL |
1721 | || input.peek(Token![crate]) |
1722 | { | |
1723 | path_or_macro_or_struct(input, allow_struct) | |
1724 | } else if input.peek(token::Paren) { | |
1725 | paren_or_tuple(input) | |
1726 | } else if input.peek(Token![break]) { | |
1727 | expr_break(input, allow_struct).map(Expr::Break) | |
1728 | } else if input.peek(Token![continue]) { | |
1729 | input.call(expr_continue).map(Expr::Continue) | |
1730 | } else if input.peek(Token![return]) { | |
1731 | expr_ret(input, allow_struct).map(Expr::Return) | |
1732 | } else if input.peek(token::Bracket) { | |
1733 | array_or_repeat(input) | |
1734 | } else if input.peek(Token![let]) { | |
1735 | input.call(expr_let).map(Expr::Let) | |
1736 | } else if input.peek(Token![if]) { | |
1737 | input.parse().map(Expr::If) | |
1738 | } else if input.peek(Token![while]) { | |
1739 | input.parse().map(Expr::While) | |
1740 | } else if input.peek(Token![for]) { | |
1741 | input.parse().map(Expr::ForLoop) | |
1742 | } else if input.peek(Token![loop]) { | |
1743 | input.parse().map(Expr::Loop) | |
1744 | } else if input.peek(Token![match]) { | |
1745 | input.parse().map(Expr::Match) | |
1746 | } else if input.peek(Token![yield]) { | |
1747 | input.call(expr_yield).map(Expr::Yield) | |
1748 | } else if input.peek(Token![unsafe]) { | |
1749 | input.call(expr_unsafe).map(Expr::Unsafe) | |
5869c6ff XL |
1750 | } else if input.peek(Token![const]) { |
1751 | input.call(expr_const).map(Expr::Verbatim) | |
e74abb32 XL |
1752 | } else if input.peek(token::Brace) { |
1753 | input.call(expr_block).map(Expr::Block) | |
1754 | } else if input.peek(Token![..]) { | |
1755 | expr_range(input, allow_struct).map(Expr::Range) | |
5869c6ff XL |
1756 | } else if input.peek(Token![_]) { |
1757 | Ok(Expr::Verbatim(TokenStream::from( | |
1758 | input.parse::<TokenTree>()?, | |
1759 | ))) | |
e74abb32 XL |
1760 | } else if input.peek(Lifetime) { |
1761 | let the_label: Label = input.parse()?; | |
1762 | let mut expr = if input.peek(Token![while]) { | |
1763 | Expr::While(input.parse()?) | |
1764 | } else if input.peek(Token![for]) { | |
1765 | Expr::ForLoop(input.parse()?) | |
1766 | } else if input.peek(Token![loop]) { | |
1767 | Expr::Loop(input.parse()?) | |
1768 | } else if input.peek(token::Brace) { | |
1769 | Expr::Block(input.call(expr_block)?) | |
1770 | } else { | |
1771 | return Err(input.error("expected loop or block expression")); | |
1772 | }; | |
1773 | match &mut expr { | |
1774 | Expr::While(ExprWhile { label, .. }) | |
1775 | | Expr::ForLoop(ExprForLoop { label, .. }) | |
1776 | | Expr::Loop(ExprLoop { label, .. }) | |
1777 | | Expr::Block(ExprBlock { label, .. }) => *label = Some(the_label), | |
1778 | _ => unreachable!(), | |
1779 | } | |
1780 | Ok(expr) | |
1781 | } else { | |
1782 | Err(input.error("expected expression")) | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | #[cfg(not(feature = "full"))] | |
1787 | fn atom_expr(input: ParseStream, _allow_struct: AllowStruct) -> Result<Expr> { | |
1788 | if input.peek(Lit) { | |
1789 | input.parse().map(Expr::Lit) | |
1790 | } else if input.peek(token::Paren) { | |
1791 | input.call(expr_paren).map(Expr::Paren) | |
1792 | } else if input.peek(Ident) | |
1793 | || input.peek(Token![::]) | |
1794 | || input.peek(Token![<]) | |
1795 | || input.peek(Token![self]) | |
1796 | || input.peek(Token![Self]) | |
1797 | || input.peek(Token![super]) | |
e74abb32 XL |
1798 | || input.peek(Token![crate]) |
1799 | { | |
1800 | input.parse().map(Expr::Path) | |
1801 | } else { | |
1802 | Err(input.error("unsupported expression; enable syn's features=[\"full\"]")) | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | #[cfg(feature = "full")] | |
1807 | fn path_or_macro_or_struct(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> { | |
1808 | let expr: ExprPath = input.parse()?; | |
1809 | if expr.qself.is_some() { | |
1810 | return Ok(Expr::Path(expr)); | |
1811 | } | |
1812 | ||
1813 | if input.peek(Token![!]) && !input.peek(Token![!=]) { | |
1814 | let mut contains_arguments = false; | |
1815 | for segment in &expr.path.segments { | |
1816 | match segment.arguments { | |
1817 | PathArguments::None => {} | |
1818 | PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => { | |
1819 | contains_arguments = true; | |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | ||
1824 | if !contains_arguments { | |
1825 | let bang_token: Token![!] = input.parse()?; | |
1826 | let (delimiter, tokens) = mac::parse_delimiter(input)?; | |
1827 | return Ok(Expr::Macro(ExprMacro { | |
1828 | attrs: Vec::new(), | |
1829 | mac: Macro { | |
1830 | path: expr.path, | |
1831 | bang_token, | |
1832 | delimiter, | |
1833 | tokens, | |
1834 | }, | |
1835 | })); | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | if allow_struct.0 && input.peek(token::Brace) { | |
1840 | let outer_attrs = Vec::new(); | |
1841 | expr_struct_helper(input, outer_attrs, expr.path).map(Expr::Struct) | |
1842 | } else { | |
1843 | Ok(Expr::Path(expr)) | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | #[cfg(feature = "full")] | |
1848 | fn paren_or_tuple(input: ParseStream) -> Result<Expr> { | |
1849 | let content; | |
1850 | let paren_token = parenthesized!(content in input); | |
1851 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
1852 | if content.is_empty() { | |
1853 | return Ok(Expr::Tuple(ExprTuple { | |
1854 | attrs: inner_attrs, | |
1855 | paren_token, | |
1856 | elems: Punctuated::new(), | |
1857 | })); | |
1858 | } | |
1859 | ||
1860 | let first: Expr = content.parse()?; | |
1861 | if content.is_empty() { | |
1862 | return Ok(Expr::Paren(ExprParen { | |
1863 | attrs: inner_attrs, | |
1864 | paren_token, | |
1865 | expr: Box::new(first), | |
1866 | })); | |
1867 | } | |
1868 | ||
1869 | let mut elems = Punctuated::new(); | |
1870 | elems.push_value(first); | |
1871 | while !content.is_empty() { | |
1872 | let punct = content.parse()?; | |
1873 | elems.push_punct(punct); | |
1874 | if content.is_empty() { | |
1875 | break; | |
1876 | } | |
1877 | let value = content.parse()?; | |
1878 | elems.push_value(value); | |
1879 | } | |
1880 | Ok(Expr::Tuple(ExprTuple { | |
1881 | attrs: inner_attrs, | |
1882 | paren_token, | |
1883 | elems, | |
1884 | })) | |
1885 | } | |
1886 | ||
1887 | #[cfg(feature = "full")] | |
1888 | fn array_or_repeat(input: ParseStream) -> Result<Expr> { | |
1889 | let content; | |
1890 | let bracket_token = bracketed!(content in input); | |
1891 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
1892 | if content.is_empty() { | |
1893 | return Ok(Expr::Array(ExprArray { | |
1894 | attrs: inner_attrs, | |
1895 | bracket_token, | |
1896 | elems: Punctuated::new(), | |
1897 | })); | |
1898 | } | |
1899 | ||
1900 | let first: Expr = content.parse()?; | |
1901 | if content.is_empty() || content.peek(Token![,]) { | |
1902 | let mut elems = Punctuated::new(); | |
1903 | elems.push_value(first); | |
1904 | while !content.is_empty() { | |
1905 | let punct = content.parse()?; | |
1906 | elems.push_punct(punct); | |
1907 | if content.is_empty() { | |
1908 | break; | |
1909 | } | |
1910 | let value = content.parse()?; | |
1911 | elems.push_value(value); | |
1912 | } | |
1913 | Ok(Expr::Array(ExprArray { | |
1914 | attrs: inner_attrs, | |
1915 | bracket_token, | |
1916 | elems, | |
1917 | })) | |
1918 | } else if content.peek(Token![;]) { | |
1919 | let semi_token: Token![;] = content.parse()?; | |
1920 | let len: Expr = content.parse()?; | |
1921 | Ok(Expr::Repeat(ExprRepeat { | |
1922 | attrs: inner_attrs, | |
1923 | bracket_token, | |
1924 | expr: Box::new(first), | |
1925 | semi_token, | |
1926 | len: Box::new(len), | |
1927 | })) | |
1928 | } else { | |
1929 | Err(content.error("expected `,` or `;`")) | |
1930 | } | |
1931 | } | |
1932 | ||
1933 | #[cfg(feature = "full")] | |
1934 | pub(crate) fn expr_early(input: ParseStream) -> Result<Expr> { | |
f035d41b | 1935 | let mut attrs = input.call(expr_attrs)?; |
e74abb32 XL |
1936 | let mut expr = if input.peek(Token![if]) { |
1937 | Expr::If(input.parse()?) | |
1938 | } else if input.peek(Token![while]) { | |
1939 | Expr::While(input.parse()?) | |
1940 | } else if input.peek(Token![for]) { | |
1941 | Expr::ForLoop(input.parse()?) | |
1942 | } else if input.peek(Token![loop]) { | |
1943 | Expr::Loop(input.parse()?) | |
1944 | } else if input.peek(Token![match]) { | |
1945 | Expr::Match(input.parse()?) | |
1946 | } else if input.peek(Token![try]) && input.peek2(token::Brace) { | |
1947 | Expr::TryBlock(input.call(expr_try_block)?) | |
1948 | } else if input.peek(Token![unsafe]) { | |
1949 | Expr::Unsafe(input.call(expr_unsafe)?) | |
5869c6ff XL |
1950 | } else if input.peek(Token![const]) { |
1951 | Expr::Verbatim(input.call(expr_const)?) | |
e74abb32 XL |
1952 | } else if input.peek(token::Brace) { |
1953 | Expr::Block(input.call(expr_block)?) | |
1954 | } else { | |
1955 | let allow_struct = AllowStruct(true); | |
1956 | let mut expr = unary_expr(input, allow_struct)?; | |
1957 | ||
1958 | attrs.extend(expr.replace_attrs(Vec::new())); | |
1959 | expr.replace_attrs(attrs); | |
1960 | ||
1961 | return parse_expr(input, expr, allow_struct, Precedence::Any); | |
1962 | }; | |
1963 | ||
f035d41b | 1964 | if input.peek(Token![.]) && !input.peek(Token![..]) || input.peek(Token![?]) { |
e74abb32 XL |
1965 | expr = trailer_helper(input, expr)?; |
1966 | ||
1967 | attrs.extend(expr.replace_attrs(Vec::new())); | |
1968 | expr.replace_attrs(attrs); | |
1969 | ||
1970 | let allow_struct = AllowStruct(true); | |
1971 | return parse_expr(input, expr, allow_struct, Precedence::Any); | |
1972 | } | |
1973 | ||
1974 | attrs.extend(expr.replace_attrs(Vec::new())); | |
1975 | expr.replace_attrs(attrs); | |
1976 | Ok(expr) | |
1977 | } | |
1978 | ||
5869c6ff | 1979 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
1980 | impl Parse for ExprLit { |
1981 | fn parse(input: ParseStream) -> Result<Self> { | |
1982 | Ok(ExprLit { | |
1983 | attrs: Vec::new(), | |
1984 | lit: input.parse()?, | |
1985 | }) | |
1986 | } | |
1987 | } | |
1988 | ||
1989 | #[cfg(feature = "full")] | |
1990 | fn expr_group(input: ParseStream) -> Result<ExprGroup> { | |
1991 | let group = crate::group::parse_group(input)?; | |
1992 | Ok(ExprGroup { | |
1993 | attrs: Vec::new(), | |
1994 | group_token: group.token, | |
1995 | expr: group.content.parse()?, | |
1996 | }) | |
1997 | } | |
1998 | ||
1999 | #[cfg(not(feature = "full"))] | |
2000 | fn expr_paren(input: ParseStream) -> Result<ExprParen> { | |
2001 | let content; | |
2002 | Ok(ExprParen { | |
2003 | attrs: Vec::new(), | |
2004 | paren_token: parenthesized!(content in input), | |
2005 | expr: content.parse()?, | |
2006 | }) | |
2007 | } | |
2008 | ||
2009 | #[cfg(feature = "full")] | |
2010 | fn generic_method_argument(input: ParseStream) -> Result<GenericMethodArgument> { | |
f035d41b XL |
2011 | if input.peek(Lit) { |
2012 | let lit = input.parse()?; | |
2013 | return Ok(GenericMethodArgument::Const(Expr::Lit(lit))); | |
2014 | } | |
2015 | ||
2016 | if input.peek(token::Brace) { | |
2017 | let block = input.call(expr::parsing::expr_block)?; | |
2018 | return Ok(GenericMethodArgument::Const(Expr::Block(block))); | |
2019 | } | |
2020 | ||
e74abb32 XL |
2021 | input.parse().map(GenericMethodArgument::Type) |
2022 | } | |
2023 | ||
2024 | #[cfg(feature = "full")] | |
2025 | fn expr_let(input: ParseStream) -> Result<ExprLet> { | |
2026 | Ok(ExprLet { | |
2027 | attrs: Vec::new(), | |
2028 | let_token: input.parse()?, | |
f035d41b | 2029 | pat: pat::parsing::multi_pat_with_leading_vert(input)?, |
e74abb32 | 2030 | eq_token: input.parse()?, |
f035d41b | 2031 | expr: Box::new(input.call(Expr::parse_without_eager_brace)?), |
e74abb32 XL |
2032 | }) |
2033 | } | |
2034 | ||
2035 | #[cfg(feature = "full")] | |
5869c6ff | 2036 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2037 | impl Parse for ExprIf { |
2038 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2039 | let attrs = input.call(Attribute::parse_outer)?; |
e74abb32 | 2040 | Ok(ExprIf { |
f035d41b | 2041 | attrs, |
e74abb32 | 2042 | if_token: input.parse()?, |
f035d41b | 2043 | cond: Box::new(input.call(Expr::parse_without_eager_brace)?), |
e74abb32 XL |
2044 | then_branch: input.parse()?, |
2045 | else_branch: { | |
2046 | if input.peek(Token![else]) { | |
2047 | Some(input.call(else_block)?) | |
2048 | } else { | |
2049 | None | |
2050 | } | |
2051 | }, | |
2052 | }) | |
2053 | } | |
2054 | } | |
2055 | ||
2056 | #[cfg(feature = "full")] | |
2057 | fn else_block(input: ParseStream) -> Result<(Token![else], Box<Expr>)> { | |
2058 | let else_token: Token![else] = input.parse()?; | |
2059 | ||
2060 | let lookahead = input.lookahead1(); | |
2061 | let else_branch = if input.peek(Token![if]) { | |
2062 | input.parse().map(Expr::If)? | |
2063 | } else if input.peek(token::Brace) { | |
2064 | Expr::Block(ExprBlock { | |
2065 | attrs: Vec::new(), | |
2066 | label: None, | |
2067 | block: input.parse()?, | |
2068 | }) | |
2069 | } else { | |
2070 | return Err(lookahead.error()); | |
2071 | }; | |
2072 | ||
2073 | Ok((else_token, Box::new(else_branch))) | |
2074 | } | |
2075 | ||
2076 | #[cfg(feature = "full")] | |
5869c6ff | 2077 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2078 | impl Parse for ExprForLoop { |
2079 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2080 | let outer_attrs = input.call(Attribute::parse_outer)?; |
e74abb32 XL |
2081 | let label: Option<Label> = input.parse()?; |
2082 | let for_token: Token![for] = input.parse()?; | |
2083 | ||
f035d41b | 2084 | let pat = pat::parsing::multi_pat_with_leading_vert(input)?; |
e74abb32 XL |
2085 | |
2086 | let in_token: Token![in] = input.parse()?; | |
f035d41b | 2087 | let expr: Expr = input.call(Expr::parse_without_eager_brace)?; |
e74abb32 XL |
2088 | |
2089 | let content; | |
2090 | let brace_token = braced!(content in input); | |
2091 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2092 | let stmts = content.call(Block::parse_within)?; | |
2093 | ||
2094 | Ok(ExprForLoop { | |
f035d41b | 2095 | attrs: private::attrs(outer_attrs, inner_attrs), |
e74abb32 XL |
2096 | label, |
2097 | for_token, | |
2098 | pat, | |
2099 | in_token, | |
2100 | expr: Box::new(expr), | |
2101 | body: Block { brace_token, stmts }, | |
2102 | }) | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | #[cfg(feature = "full")] | |
5869c6ff | 2107 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2108 | impl Parse for ExprLoop { |
2109 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2110 | let outer_attrs = input.call(Attribute::parse_outer)?; |
e74abb32 XL |
2111 | let label: Option<Label> = input.parse()?; |
2112 | let loop_token: Token![loop] = input.parse()?; | |
2113 | ||
2114 | let content; | |
2115 | let brace_token = braced!(content in input); | |
2116 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2117 | let stmts = content.call(Block::parse_within)?; | |
2118 | ||
2119 | Ok(ExprLoop { | |
f035d41b | 2120 | attrs: private::attrs(outer_attrs, inner_attrs), |
e74abb32 XL |
2121 | label, |
2122 | loop_token, | |
2123 | body: Block { brace_token, stmts }, | |
2124 | }) | |
2125 | } | |
2126 | } | |
2127 | ||
2128 | #[cfg(feature = "full")] | |
5869c6ff | 2129 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2130 | impl Parse for ExprMatch { |
2131 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2132 | let outer_attrs = input.call(Attribute::parse_outer)?; |
e74abb32 | 2133 | let match_token: Token![match] = input.parse()?; |
f035d41b | 2134 | let expr = Expr::parse_without_eager_brace(input)?; |
e74abb32 XL |
2135 | |
2136 | let content; | |
2137 | let brace_token = braced!(content in input); | |
2138 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2139 | ||
2140 | let mut arms = Vec::new(); | |
2141 | while !content.is_empty() { | |
2142 | arms.push(content.call(Arm::parse)?); | |
2143 | } | |
2144 | ||
2145 | Ok(ExprMatch { | |
f035d41b | 2146 | attrs: private::attrs(outer_attrs, inner_attrs), |
e74abb32 XL |
2147 | match_token, |
2148 | expr: Box::new(expr), | |
2149 | brace_token, | |
2150 | arms, | |
2151 | }) | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | macro_rules! impl_by_parsing_expr { | |
2156 | ( | |
2157 | $( | |
2158 | $expr_type:ty, $variant:ident, $msg:expr, | |
2159 | )* | |
2160 | ) => { | |
2161 | $( | |
2162 | #[cfg(all(feature = "full", feature = "printing"))] | |
5869c6ff | 2163 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2164 | impl Parse for $expr_type { |
2165 | fn parse(input: ParseStream) -> Result<Self> { | |
2166 | let mut expr: Expr = input.parse()?; | |
2167 | loop { | |
2168 | match expr { | |
2169 | Expr::$variant(inner) => return Ok(inner), | |
2170 | Expr::Group(next) => expr = *next.expr, | |
2171 | _ => return Err(Error::new_spanned(expr, $msg)), | |
2172 | } | |
2173 | } | |
2174 | } | |
2175 | } | |
2176 | )* | |
2177 | }; | |
2178 | } | |
2179 | ||
2180 | impl_by_parsing_expr! { | |
2181 | ExprBox, Box, "expected box expression", | |
2182 | ExprArray, Array, "expected slice literal expression", | |
2183 | ExprCall, Call, "expected function call expression", | |
2184 | ExprMethodCall, MethodCall, "expected method call expression", | |
2185 | ExprTuple, Tuple, "expected tuple expression", | |
2186 | ExprBinary, Binary, "expected binary operation", | |
2187 | ExprUnary, Unary, "expected unary operation", | |
2188 | ExprCast, Cast, "expected cast expression", | |
2189 | ExprType, Type, "expected type ascription expression", | |
2190 | ExprLet, Let, "expected let guard", | |
2191 | ExprClosure, Closure, "expected closure expression", | |
2192 | ExprUnsafe, Unsafe, "expected unsafe block", | |
2193 | ExprBlock, Block, "expected blocked scope", | |
2194 | ExprAssign, Assign, "expected assignment expression", | |
2195 | ExprAssignOp, AssignOp, "expected compound assignment expression", | |
2196 | ExprField, Field, "expected struct field access", | |
2197 | ExprIndex, Index, "expected indexing expression", | |
2198 | ExprRange, Range, "expected range expression", | |
2199 | ExprReference, Reference, "expected referencing operation", | |
2200 | ExprBreak, Break, "expected break expression", | |
2201 | ExprContinue, Continue, "expected continue expression", | |
2202 | ExprReturn, Return, "expected return expression", | |
2203 | ExprMacro, Macro, "expected macro invocation expression", | |
2204 | ExprStruct, Struct, "expected struct literal expression", | |
2205 | ExprRepeat, Repeat, "expected array literal constructed from one repeated element", | |
2206 | ExprParen, Paren, "expected parenthesized expression", | |
2207 | ExprTry, Try, "expected try expression", | |
2208 | ExprAsync, Async, "expected async block", | |
2209 | ExprTryBlock, TryBlock, "expected try block", | |
2210 | ExprYield, Yield, "expected yield expression", | |
2211 | } | |
2212 | ||
2213 | #[cfg(feature = "full")] | |
2214 | fn expr_try_block(input: ParseStream) -> Result<ExprTryBlock> { | |
2215 | Ok(ExprTryBlock { | |
2216 | attrs: Vec::new(), | |
2217 | try_token: input.parse()?, | |
2218 | block: input.parse()?, | |
2219 | }) | |
2220 | } | |
2221 | ||
2222 | #[cfg(feature = "full")] | |
2223 | fn expr_yield(input: ParseStream) -> Result<ExprYield> { | |
2224 | Ok(ExprYield { | |
2225 | attrs: Vec::new(), | |
2226 | yield_token: input.parse()?, | |
2227 | expr: { | |
2228 | if !input.is_empty() && !input.peek(Token![,]) && !input.peek(Token![;]) { | |
2229 | Some(input.parse()?) | |
2230 | } else { | |
2231 | None | |
2232 | } | |
2233 | }, | |
2234 | }) | |
2235 | } | |
2236 | ||
2237 | #[cfg(feature = "full")] | |
2238 | fn expr_closure(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprClosure> { | |
2239 | let asyncness: Option<Token![async]> = input.parse()?; | |
2240 | let movability: Option<Token![static]> = if asyncness.is_none() { | |
2241 | input.parse()? | |
2242 | } else { | |
2243 | None | |
2244 | }; | |
2245 | let capture: Option<Token![move]> = input.parse()?; | |
2246 | let or1_token: Token![|] = input.parse()?; | |
2247 | ||
2248 | let mut inputs = Punctuated::new(); | |
2249 | loop { | |
2250 | if input.peek(Token![|]) { | |
2251 | break; | |
2252 | } | |
2253 | let value = closure_arg(input)?; | |
2254 | inputs.push_value(value); | |
2255 | if input.peek(Token![|]) { | |
2256 | break; | |
2257 | } | |
2258 | let punct: Token![,] = input.parse()?; | |
2259 | inputs.push_punct(punct); | |
2260 | } | |
2261 | ||
2262 | let or2_token: Token![|] = input.parse()?; | |
2263 | ||
2264 | let (output, body) = if input.peek(Token![->]) { | |
2265 | let arrow_token: Token![->] = input.parse()?; | |
2266 | let ty: Type = input.parse()?; | |
2267 | let body: Block = input.parse()?; | |
2268 | let output = ReturnType::Type(arrow_token, Box::new(ty)); | |
2269 | let block = Expr::Block(ExprBlock { | |
2270 | attrs: Vec::new(), | |
2271 | label: None, | |
2272 | block: body, | |
2273 | }); | |
2274 | (output, block) | |
2275 | } else { | |
2276 | let body = ambiguous_expr(input, allow_struct)?; | |
2277 | (ReturnType::Default, body) | |
2278 | }; | |
2279 | ||
2280 | Ok(ExprClosure { | |
2281 | attrs: Vec::new(), | |
2282 | asyncness, | |
2283 | movability, | |
2284 | capture, | |
2285 | or1_token, | |
2286 | inputs, | |
2287 | or2_token, | |
2288 | output, | |
2289 | body: Box::new(body), | |
2290 | }) | |
2291 | } | |
2292 | ||
2293 | #[cfg(feature = "full")] | |
2294 | fn expr_async(input: ParseStream) -> Result<ExprAsync> { | |
2295 | Ok(ExprAsync { | |
2296 | attrs: Vec::new(), | |
2297 | async_token: input.parse()?, | |
2298 | capture: input.parse()?, | |
2299 | block: input.parse()?, | |
2300 | }) | |
2301 | } | |
2302 | ||
2303 | #[cfg(feature = "full")] | |
2304 | fn closure_arg(input: ParseStream) -> Result<Pat> { | |
2305 | let attrs = input.call(Attribute::parse_outer)?; | |
2306 | let mut pat: Pat = input.parse()?; | |
2307 | ||
2308 | if input.peek(Token![:]) { | |
2309 | Ok(Pat::Type(PatType { | |
2310 | attrs, | |
2311 | pat: Box::new(pat), | |
2312 | colon_token: input.parse()?, | |
2313 | ty: input.parse()?, | |
2314 | })) | |
2315 | } else { | |
2316 | match &mut pat { | |
2317 | Pat::Box(pat) => pat.attrs = attrs, | |
2318 | Pat::Ident(pat) => pat.attrs = attrs, | |
2319 | Pat::Lit(pat) => pat.attrs = attrs, | |
2320 | Pat::Macro(pat) => pat.attrs = attrs, | |
2321 | Pat::Or(pat) => pat.attrs = attrs, | |
2322 | Pat::Path(pat) => pat.attrs = attrs, | |
2323 | Pat::Range(pat) => pat.attrs = attrs, | |
2324 | Pat::Reference(pat) => pat.attrs = attrs, | |
2325 | Pat::Rest(pat) => pat.attrs = attrs, | |
2326 | Pat::Slice(pat) => pat.attrs = attrs, | |
2327 | Pat::Struct(pat) => pat.attrs = attrs, | |
2328 | Pat::Tuple(pat) => pat.attrs = attrs, | |
2329 | Pat::TupleStruct(pat) => pat.attrs = attrs, | |
2330 | Pat::Type(_) => unreachable!(), | |
2331 | Pat::Verbatim(_) => {} | |
2332 | Pat::Wild(pat) => pat.attrs = attrs, | |
6a06907d XL |
2333 | |
2334 | #[cfg(test)] | |
2335 | Pat::__TestExhaustive(_) => unimplemented!(), | |
2336 | #[cfg(not(test))] | |
2337 | _ => unreachable!(), | |
e74abb32 XL |
2338 | } |
2339 | Ok(pat) | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | #[cfg(feature = "full")] | |
5869c6ff | 2344 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2345 | impl Parse for ExprWhile { |
2346 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2347 | let outer_attrs = input.call(Attribute::parse_outer)?; |
e74abb32 XL |
2348 | let label: Option<Label> = input.parse()?; |
2349 | let while_token: Token![while] = input.parse()?; | |
f035d41b | 2350 | let cond = Expr::parse_without_eager_brace(input)?; |
e74abb32 XL |
2351 | |
2352 | let content; | |
2353 | let brace_token = braced!(content in input); | |
2354 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2355 | let stmts = content.call(Block::parse_within)?; | |
2356 | ||
2357 | Ok(ExprWhile { | |
f035d41b | 2358 | attrs: private::attrs(outer_attrs, inner_attrs), |
e74abb32 XL |
2359 | label, |
2360 | while_token, | |
2361 | cond: Box::new(cond), | |
2362 | body: Block { brace_token, stmts }, | |
2363 | }) | |
2364 | } | |
2365 | } | |
2366 | ||
2367 | #[cfg(feature = "full")] | |
5869c6ff | 2368 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2369 | impl Parse for Label { |
2370 | fn parse(input: ParseStream) -> Result<Self> { | |
2371 | Ok(Label { | |
2372 | name: input.parse()?, | |
2373 | colon_token: input.parse()?, | |
2374 | }) | |
2375 | } | |
2376 | } | |
2377 | ||
2378 | #[cfg(feature = "full")] | |
5869c6ff | 2379 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2380 | impl Parse for Option<Label> { |
2381 | fn parse(input: ParseStream) -> Result<Self> { | |
2382 | if input.peek(Lifetime) { | |
2383 | input.parse().map(Some) | |
2384 | } else { | |
2385 | Ok(None) | |
2386 | } | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | #[cfg(feature = "full")] | |
2391 | fn expr_continue(input: ParseStream) -> Result<ExprContinue> { | |
2392 | Ok(ExprContinue { | |
2393 | attrs: Vec::new(), | |
2394 | continue_token: input.parse()?, | |
2395 | label: input.parse()?, | |
2396 | }) | |
2397 | } | |
2398 | ||
2399 | #[cfg(feature = "full")] | |
2400 | fn expr_break(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprBreak> { | |
2401 | Ok(ExprBreak { | |
2402 | attrs: Vec::new(), | |
2403 | break_token: input.parse()?, | |
2404 | label: input.parse()?, | |
2405 | expr: { | |
2406 | if input.is_empty() | |
2407 | || input.peek(Token![,]) | |
2408 | || input.peek(Token![;]) | |
2409 | || !allow_struct.0 && input.peek(token::Brace) | |
2410 | { | |
2411 | None | |
2412 | } else { | |
2413 | let expr = ambiguous_expr(input, allow_struct)?; | |
2414 | Some(Box::new(expr)) | |
2415 | } | |
2416 | }, | |
2417 | }) | |
2418 | } | |
2419 | ||
2420 | #[cfg(feature = "full")] | |
2421 | fn expr_ret(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprReturn> { | |
2422 | Ok(ExprReturn { | |
2423 | attrs: Vec::new(), | |
2424 | return_token: input.parse()?, | |
2425 | expr: { | |
2426 | if input.is_empty() || input.peek(Token![,]) || input.peek(Token![;]) { | |
2427 | None | |
2428 | } else { | |
2429 | // NOTE: return is greedy and eats blocks after it even when in a | |
2430 | // position where structs are not allowed, such as in if statement | |
2431 | // conditions. For example: | |
2432 | // | |
2433 | // if return { println!("A") } {} // Prints "A" | |
2434 | let expr = ambiguous_expr(input, allow_struct)?; | |
2435 | Some(Box::new(expr)) | |
2436 | } | |
2437 | }, | |
2438 | }) | |
2439 | } | |
2440 | ||
2441 | #[cfg(feature = "full")] | |
5869c6ff | 2442 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2443 | impl Parse for FieldValue { |
2444 | fn parse(input: ParseStream) -> Result<Self> { | |
f035d41b | 2445 | let attrs = input.call(Attribute::parse_outer)?; |
e74abb32 XL |
2446 | let member: Member = input.parse()?; |
2447 | let (colon_token, value) = if input.peek(Token![:]) || !member.is_named() { | |
2448 | let colon_token: Token![:] = input.parse()?; | |
2449 | let value: Expr = input.parse()?; | |
2450 | (Some(colon_token), value) | |
2451 | } else if let Member::Named(ident) = &member { | |
2452 | let value = Expr::Path(ExprPath { | |
2453 | attrs: Vec::new(), | |
2454 | qself: None, | |
2455 | path: Path::from(ident.clone()), | |
2456 | }); | |
2457 | (None, value) | |
2458 | } else { | |
2459 | unreachable!() | |
2460 | }; | |
2461 | ||
2462 | Ok(FieldValue { | |
f035d41b | 2463 | attrs, |
e74abb32 XL |
2464 | member, |
2465 | colon_token, | |
2466 | expr: value, | |
2467 | }) | |
2468 | } | |
2469 | } | |
2470 | ||
2471 | #[cfg(feature = "full")] | |
2472 | fn expr_struct_helper( | |
2473 | input: ParseStream, | |
2474 | outer_attrs: Vec<Attribute>, | |
2475 | path: Path, | |
2476 | ) -> Result<ExprStruct> { | |
2477 | let content; | |
2478 | let brace_token = braced!(content in input); | |
2479 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
f035d41b | 2480 | let attrs = private::attrs(outer_attrs, inner_attrs); |
e74abb32 XL |
2481 | |
2482 | let mut fields = Punctuated::new(); | |
f035d41b XL |
2483 | while !content.is_empty() { |
2484 | if content.peek(Token![..]) { | |
2485 | return Ok(ExprStruct { | |
2486 | attrs, | |
2487 | brace_token, | |
2488 | path, | |
2489 | fields, | |
2490 | dot2_token: Some(content.parse()?), | |
5869c6ff XL |
2491 | rest: if content.is_empty() { |
2492 | None | |
2493 | } else { | |
2494 | Some(Box::new(content.parse()?)) | |
2495 | }, | |
f035d41b | 2496 | }); |
e74abb32 XL |
2497 | } |
2498 | ||
f035d41b XL |
2499 | fields.push(content.parse()?); |
2500 | if content.is_empty() { | |
e74abb32 XL |
2501 | break; |
2502 | } | |
2503 | let punct: Token![,] = content.parse()?; | |
2504 | fields.push_punct(punct); | |
2505 | } | |
2506 | ||
e74abb32 | 2507 | Ok(ExprStruct { |
f035d41b | 2508 | attrs, |
e74abb32 XL |
2509 | brace_token, |
2510 | path, | |
2511 | fields, | |
f035d41b XL |
2512 | dot2_token: None, |
2513 | rest: None, | |
e74abb32 XL |
2514 | }) |
2515 | } | |
2516 | ||
2517 | #[cfg(feature = "full")] | |
2518 | fn expr_unsafe(input: ParseStream) -> Result<ExprUnsafe> { | |
2519 | let unsafe_token: Token![unsafe] = input.parse()?; | |
2520 | ||
2521 | let content; | |
2522 | let brace_token = braced!(content in input); | |
2523 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2524 | let stmts = content.call(Block::parse_within)?; | |
2525 | ||
2526 | Ok(ExprUnsafe { | |
2527 | attrs: inner_attrs, | |
2528 | unsafe_token, | |
2529 | block: Block { brace_token, stmts }, | |
2530 | }) | |
2531 | } | |
2532 | ||
5869c6ff XL |
2533 | #[cfg(feature = "full")] |
2534 | pub(crate) fn expr_const(input: ParseStream) -> Result<TokenStream> { | |
2535 | let begin = input.fork(); | |
2536 | input.parse::<Token![const]>()?; | |
2537 | ||
2538 | let content; | |
2539 | braced!(content in input); | |
2540 | content.call(Attribute::parse_inner)?; | |
2541 | content.call(Block::parse_within)?; | |
2542 | ||
2543 | Ok(verbatim::between(begin, input)) | |
2544 | } | |
2545 | ||
e74abb32 XL |
2546 | #[cfg(feature = "full")] |
2547 | pub fn expr_block(input: ParseStream) -> Result<ExprBlock> { | |
2548 | let label: Option<Label> = input.parse()?; | |
2549 | ||
2550 | let content; | |
2551 | let brace_token = braced!(content in input); | |
2552 | let inner_attrs = content.call(Attribute::parse_inner)?; | |
2553 | let stmts = content.call(Block::parse_within)?; | |
2554 | ||
2555 | Ok(ExprBlock { | |
2556 | attrs: inner_attrs, | |
2557 | label, | |
2558 | block: Block { brace_token, stmts }, | |
2559 | }) | |
2560 | } | |
2561 | ||
2562 | #[cfg(feature = "full")] | |
2563 | fn expr_range(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprRange> { | |
2564 | Ok(ExprRange { | |
2565 | attrs: Vec::new(), | |
2566 | from: None, | |
2567 | limits: input.parse()?, | |
2568 | to: { | |
2569 | if input.is_empty() | |
2570 | || input.peek(Token![,]) | |
2571 | || input.peek(Token![;]) | |
2572 | || !allow_struct.0 && input.peek(token::Brace) | |
2573 | { | |
2574 | None | |
2575 | } else { | |
2576 | let to = ambiguous_expr(input, allow_struct)?; | |
2577 | Some(Box::new(to)) | |
2578 | } | |
2579 | }, | |
2580 | }) | |
2581 | } | |
2582 | ||
2583 | #[cfg(feature = "full")] | |
5869c6ff | 2584 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2585 | impl Parse for RangeLimits { |
2586 | fn parse(input: ParseStream) -> Result<Self> { | |
2587 | let lookahead = input.lookahead1(); | |
2588 | if lookahead.peek(Token![..=]) { | |
2589 | input.parse().map(RangeLimits::Closed) | |
2590 | } else if lookahead.peek(Token![...]) { | |
2591 | let dot3: Token![...] = input.parse()?; | |
2592 | Ok(RangeLimits::Closed(Token![..=](dot3.spans))) | |
2593 | } else if lookahead.peek(Token![..]) { | |
2594 | input.parse().map(RangeLimits::HalfOpen) | |
2595 | } else { | |
2596 | Err(lookahead.error()) | |
2597 | } | |
2598 | } | |
2599 | } | |
2600 | ||
5869c6ff | 2601 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2602 | impl Parse for ExprPath { |
2603 | fn parse(input: ParseStream) -> Result<Self> { | |
2604 | #[cfg(not(feature = "full"))] | |
2605 | let attrs = Vec::new(); | |
2606 | #[cfg(feature = "full")] | |
2607 | let attrs = input.call(Attribute::parse_outer)?; | |
2608 | ||
2609 | let (qself, path) = path::parsing::qpath(input, true)?; | |
2610 | ||
2611 | Ok(ExprPath { attrs, qself, path }) | |
2612 | } | |
2613 | } | |
2614 | ||
5869c6ff | 2615 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2616 | impl Parse for Member { |
2617 | fn parse(input: ParseStream) -> Result<Self> { | |
2618 | if input.peek(Ident) { | |
2619 | input.parse().map(Member::Named) | |
2620 | } else if input.peek(LitInt) { | |
2621 | input.parse().map(Member::Unnamed) | |
2622 | } else { | |
2623 | Err(input.error("expected identifier or integer")) | |
2624 | } | |
2625 | } | |
2626 | } | |
2627 | ||
2628 | #[cfg(feature = "full")] | |
5869c6ff | 2629 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2630 | impl Parse for Arm { |
2631 | fn parse(input: ParseStream) -> Result<Arm> { | |
2632 | let requires_comma; | |
2633 | Ok(Arm { | |
2634 | attrs: input.call(Attribute::parse_outer)?, | |
f035d41b | 2635 | pat: pat::parsing::multi_pat_with_leading_vert(input)?, |
e74abb32 XL |
2636 | guard: { |
2637 | if input.peek(Token![if]) { | |
2638 | let if_token: Token![if] = input.parse()?; | |
2639 | let guard: Expr = input.parse()?; | |
2640 | Some((if_token, Box::new(guard))) | |
2641 | } else { | |
2642 | None | |
2643 | } | |
2644 | }, | |
2645 | fat_arrow_token: input.parse()?, | |
2646 | body: { | |
2647 | let body = input.call(expr_early)?; | |
2648 | requires_comma = requires_terminator(&body); | |
2649 | Box::new(body) | |
2650 | }, | |
2651 | comma: { | |
2652 | if requires_comma && !input.is_empty() { | |
2653 | Some(input.parse()?) | |
2654 | } else { | |
2655 | input.parse()? | |
2656 | } | |
2657 | }, | |
2658 | }) | |
2659 | } | |
2660 | } | |
2661 | ||
5869c6ff | 2662 | #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))] |
e74abb32 XL |
2663 | impl Parse for Index { |
2664 | fn parse(input: ParseStream) -> Result<Self> { | |
2665 | let lit: LitInt = input.parse()?; | |
2666 | if lit.suffix().is_empty() { | |
2667 | Ok(Index { | |
2668 | index: lit | |
2669 | .base10_digits() | |
2670 | .parse() | |
2671 | .map_err(|err| Error::new(lit.span(), err))?, | |
2672 | span: lit.span(), | |
2673 | }) | |
2674 | } else { | |
2675 | Err(Error::new(lit.span(), "expected unsuffixed integer")) | |
2676 | } | |
2677 | } | |
2678 | } | |
2679 | ||
3dfed10e XL |
2680 | fn multi_index(e: &mut Expr, dot_token: &mut Token![.], float: LitFloat) -> Result<bool> { |
2681 | let mut float_repr = float.to_string(); | |
2682 | let trailing_dot = float_repr.ends_with('.'); | |
2683 | if trailing_dot { | |
2684 | float_repr.truncate(float_repr.len() - 1); | |
2685 | } | |
2686 | for part in float_repr.split('.') { | |
f035d41b | 2687 | let index = crate::parse_str(part).map_err(|err| Error::new(float.span(), err))?; |
5869c6ff | 2688 | let base = mem::replace(e, Expr::__TestExhaustive(crate::private(()))); |
3dfed10e | 2689 | *e = Expr::Field(ExprField { |
f035d41b | 2690 | attrs: Vec::new(), |
3dfed10e XL |
2691 | base: Box::new(base), |
2692 | dot_token: Token![.](dot_token.span), | |
f035d41b XL |
2693 | member: Member::Unnamed(index), |
2694 | }); | |
3dfed10e | 2695 | *dot_token = Token![.](float.span()); |
f035d41b | 2696 | } |
3dfed10e | 2697 | Ok(!trailing_dot) |
f035d41b XL |
2698 | } |
2699 | ||
e74abb32 XL |
2700 | #[cfg(feature = "full")] |
2701 | impl Member { | |
2702 | fn is_named(&self) -> bool { | |
2703 | match *self { | |
2704 | Member::Named(_) => true, | |
2705 | Member::Unnamed(_) => false, | |
2706 | } | |
2707 | } | |
2708 | } | |
2709 | } | |
2710 | ||
2711 | #[cfg(feature = "printing")] | |
2712 | pub(crate) mod printing { | |
2713 | use super::*; | |
e74abb32 XL |
2714 | #[cfg(feature = "full")] |
2715 | use crate::attr::FilterAttrs; | |
29967ef6 XL |
2716 | use proc_macro2::{Literal, TokenStream}; |
2717 | use quote::{ToTokens, TokenStreamExt}; | |
e74abb32 XL |
2718 | |
2719 | // If the given expression is a bare `ExprStruct`, wraps it in parenthesis | |
2720 | // before appending it to `TokenStream`. | |
2721 | #[cfg(feature = "full")] | |
2722 | fn wrap_bare_struct(tokens: &mut TokenStream, e: &Expr) { | |
2723 | if let Expr::Struct(_) = *e { | |
2724 | token::Paren::default().surround(tokens, |tokens| { | |
2725 | e.to_tokens(tokens); | |
2726 | }); | |
2727 | } else { | |
2728 | e.to_tokens(tokens); | |
2729 | } | |
2730 | } | |
2731 | ||
2732 | #[cfg(feature = "full")] | |
2733 | pub(crate) fn outer_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) { | |
2734 | tokens.append_all(attrs.outer()); | |
2735 | } | |
2736 | ||
2737 | #[cfg(feature = "full")] | |
2738 | fn inner_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) { | |
2739 | tokens.append_all(attrs.inner()); | |
2740 | } | |
2741 | ||
2742 | #[cfg(not(feature = "full"))] | |
2743 | pub(crate) fn outer_attrs_to_tokens(_attrs: &[Attribute], _tokens: &mut TokenStream) {} | |
2744 | ||
2745 | #[cfg(not(feature = "full"))] | |
2746 | fn inner_attrs_to_tokens(_attrs: &[Attribute], _tokens: &mut TokenStream) {} | |
2747 | ||
2748 | #[cfg(feature = "full")] | |
5869c6ff | 2749 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2750 | impl ToTokens for ExprBox { |
2751 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2752 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2753 | self.box_token.to_tokens(tokens); | |
2754 | self.expr.to_tokens(tokens); | |
2755 | } | |
2756 | } | |
2757 | ||
2758 | #[cfg(feature = "full")] | |
5869c6ff | 2759 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2760 | impl ToTokens for ExprArray { |
2761 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2762 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2763 | self.bracket_token.surround(tokens, |tokens| { | |
2764 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2765 | self.elems.to_tokens(tokens); | |
2766 | }) | |
2767 | } | |
2768 | } | |
2769 | ||
5869c6ff | 2770 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2771 | impl ToTokens for ExprCall { |
2772 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2773 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2774 | self.func.to_tokens(tokens); | |
2775 | self.paren_token.surround(tokens, |tokens| { | |
2776 | self.args.to_tokens(tokens); | |
2777 | }) | |
2778 | } | |
2779 | } | |
2780 | ||
2781 | #[cfg(feature = "full")] | |
5869c6ff | 2782 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2783 | impl ToTokens for ExprMethodCall { |
2784 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2785 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2786 | self.receiver.to_tokens(tokens); | |
2787 | self.dot_token.to_tokens(tokens); | |
2788 | self.method.to_tokens(tokens); | |
2789 | self.turbofish.to_tokens(tokens); | |
2790 | self.paren_token.surround(tokens, |tokens| { | |
2791 | self.args.to_tokens(tokens); | |
2792 | }); | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | #[cfg(feature = "full")] | |
5869c6ff | 2797 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2798 | impl ToTokens for MethodTurbofish { |
2799 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2800 | self.colon2_token.to_tokens(tokens); | |
2801 | self.lt_token.to_tokens(tokens); | |
2802 | self.args.to_tokens(tokens); | |
2803 | self.gt_token.to_tokens(tokens); | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | #[cfg(feature = "full")] | |
5869c6ff | 2808 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2809 | impl ToTokens for GenericMethodArgument { |
2810 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2811 | match self { | |
2812 | GenericMethodArgument::Type(t) => t.to_tokens(tokens), | |
2813 | GenericMethodArgument::Const(c) => c.to_tokens(tokens), | |
2814 | } | |
2815 | } | |
2816 | } | |
2817 | ||
2818 | #[cfg(feature = "full")] | |
5869c6ff | 2819 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2820 | impl ToTokens for ExprTuple { |
2821 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2822 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2823 | self.paren_token.surround(tokens, |tokens| { | |
2824 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2825 | self.elems.to_tokens(tokens); | |
2826 | // If we only have one argument, we need a trailing comma to | |
2827 | // distinguish ExprTuple from ExprParen. | |
2828 | if self.elems.len() == 1 && !self.elems.trailing_punct() { | |
2829 | <Token![,]>::default().to_tokens(tokens); | |
2830 | } | |
2831 | }) | |
2832 | } | |
2833 | } | |
2834 | ||
5869c6ff | 2835 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2836 | impl ToTokens for ExprBinary { |
2837 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2838 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2839 | self.left.to_tokens(tokens); | |
2840 | self.op.to_tokens(tokens); | |
2841 | self.right.to_tokens(tokens); | |
2842 | } | |
2843 | } | |
2844 | ||
5869c6ff | 2845 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2846 | impl ToTokens for ExprUnary { |
2847 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2848 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2849 | self.op.to_tokens(tokens); | |
2850 | self.expr.to_tokens(tokens); | |
2851 | } | |
2852 | } | |
2853 | ||
5869c6ff | 2854 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2855 | impl ToTokens for ExprLit { |
2856 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2857 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2858 | self.lit.to_tokens(tokens); | |
2859 | } | |
2860 | } | |
2861 | ||
5869c6ff | 2862 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2863 | impl ToTokens for ExprCast { |
2864 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2865 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2866 | self.expr.to_tokens(tokens); | |
2867 | self.as_token.to_tokens(tokens); | |
2868 | self.ty.to_tokens(tokens); | |
2869 | } | |
2870 | } | |
2871 | ||
2872 | #[cfg(feature = "full")] | |
5869c6ff | 2873 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2874 | impl ToTokens for ExprType { |
2875 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2876 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2877 | self.expr.to_tokens(tokens); | |
2878 | self.colon_token.to_tokens(tokens); | |
2879 | self.ty.to_tokens(tokens); | |
2880 | } | |
2881 | } | |
2882 | ||
2883 | #[cfg(feature = "full")] | |
2884 | fn maybe_wrap_else(tokens: &mut TokenStream, else_: &Option<(Token![else], Box<Expr>)>) { | |
2885 | if let Some((else_token, else_)) = else_ { | |
2886 | else_token.to_tokens(tokens); | |
2887 | ||
2888 | // If we are not one of the valid expressions to exist in an else | |
2889 | // clause, wrap ourselves in a block. | |
2890 | match **else_ { | |
2891 | Expr::If(_) | Expr::Block(_) => { | |
2892 | else_.to_tokens(tokens); | |
2893 | } | |
2894 | _ => { | |
2895 | token::Brace::default().surround(tokens, |tokens| { | |
2896 | else_.to_tokens(tokens); | |
2897 | }); | |
2898 | } | |
2899 | } | |
2900 | } | |
2901 | } | |
2902 | ||
2903 | #[cfg(feature = "full")] | |
5869c6ff | 2904 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2905 | impl ToTokens for ExprLet { |
2906 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2907 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2908 | self.let_token.to_tokens(tokens); | |
2909 | self.pat.to_tokens(tokens); | |
2910 | self.eq_token.to_tokens(tokens); | |
2911 | wrap_bare_struct(tokens, &self.expr); | |
2912 | } | |
2913 | } | |
2914 | ||
2915 | #[cfg(feature = "full")] | |
5869c6ff | 2916 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2917 | impl ToTokens for ExprIf { |
2918 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2919 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2920 | self.if_token.to_tokens(tokens); | |
2921 | wrap_bare_struct(tokens, &self.cond); | |
2922 | self.then_branch.to_tokens(tokens); | |
2923 | maybe_wrap_else(tokens, &self.else_branch); | |
2924 | } | |
2925 | } | |
2926 | ||
2927 | #[cfg(feature = "full")] | |
5869c6ff | 2928 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2929 | impl ToTokens for ExprWhile { |
2930 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2931 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2932 | self.label.to_tokens(tokens); | |
2933 | self.while_token.to_tokens(tokens); | |
2934 | wrap_bare_struct(tokens, &self.cond); | |
2935 | self.body.brace_token.surround(tokens, |tokens| { | |
2936 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2937 | tokens.append_all(&self.body.stmts); | |
2938 | }); | |
2939 | } | |
2940 | } | |
2941 | ||
2942 | #[cfg(feature = "full")] | |
5869c6ff | 2943 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2944 | impl ToTokens for ExprForLoop { |
2945 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2946 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2947 | self.label.to_tokens(tokens); | |
2948 | self.for_token.to_tokens(tokens); | |
2949 | self.pat.to_tokens(tokens); | |
2950 | self.in_token.to_tokens(tokens); | |
2951 | wrap_bare_struct(tokens, &self.expr); | |
2952 | self.body.brace_token.surround(tokens, |tokens| { | |
2953 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2954 | tokens.append_all(&self.body.stmts); | |
2955 | }); | |
2956 | } | |
2957 | } | |
2958 | ||
2959 | #[cfg(feature = "full")] | |
5869c6ff | 2960 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2961 | impl ToTokens for ExprLoop { |
2962 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2963 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2964 | self.label.to_tokens(tokens); | |
2965 | self.loop_token.to_tokens(tokens); | |
2966 | self.body.brace_token.surround(tokens, |tokens| { | |
2967 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2968 | tokens.append_all(&self.body.stmts); | |
2969 | }); | |
2970 | } | |
2971 | } | |
2972 | ||
2973 | #[cfg(feature = "full")] | |
5869c6ff | 2974 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2975 | impl ToTokens for ExprMatch { |
2976 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2977 | outer_attrs_to_tokens(&self.attrs, tokens); | |
2978 | self.match_token.to_tokens(tokens); | |
2979 | wrap_bare_struct(tokens, &self.expr); | |
2980 | self.brace_token.surround(tokens, |tokens| { | |
2981 | inner_attrs_to_tokens(&self.attrs, tokens); | |
2982 | for (i, arm) in self.arms.iter().enumerate() { | |
2983 | arm.to_tokens(tokens); | |
2984 | // Ensure that we have a comma after a non-block arm, except | |
2985 | // for the last one. | |
2986 | let is_last = i == self.arms.len() - 1; | |
2987 | if !is_last && requires_terminator(&arm.body) && arm.comma.is_none() { | |
2988 | <Token![,]>::default().to_tokens(tokens); | |
2989 | } | |
2990 | } | |
2991 | }); | |
2992 | } | |
2993 | } | |
2994 | ||
2995 | #[cfg(feature = "full")] | |
5869c6ff | 2996 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
2997 | impl ToTokens for ExprAsync { |
2998 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
2999 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3000 | self.async_token.to_tokens(tokens); | |
3001 | self.capture.to_tokens(tokens); | |
3002 | self.block.to_tokens(tokens); | |
3003 | } | |
3004 | } | |
3005 | ||
3006 | #[cfg(feature = "full")] | |
5869c6ff | 3007 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3008 | impl ToTokens for ExprAwait { |
3009 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3010 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3011 | self.base.to_tokens(tokens); | |
3012 | self.dot_token.to_tokens(tokens); | |
3013 | self.await_token.to_tokens(tokens); | |
3014 | } | |
3015 | } | |
3016 | ||
3017 | #[cfg(feature = "full")] | |
5869c6ff | 3018 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3019 | impl ToTokens for ExprTryBlock { |
3020 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3021 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3022 | self.try_token.to_tokens(tokens); | |
3023 | self.block.to_tokens(tokens); | |
3024 | } | |
3025 | } | |
3026 | ||
3027 | #[cfg(feature = "full")] | |
5869c6ff | 3028 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3029 | impl ToTokens for ExprYield { |
3030 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3031 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3032 | self.yield_token.to_tokens(tokens); | |
3033 | self.expr.to_tokens(tokens); | |
3034 | } | |
3035 | } | |
3036 | ||
3037 | #[cfg(feature = "full")] | |
5869c6ff | 3038 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3039 | impl ToTokens for ExprClosure { |
3040 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3041 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3042 | self.asyncness.to_tokens(tokens); | |
3043 | self.movability.to_tokens(tokens); | |
3044 | self.capture.to_tokens(tokens); | |
3045 | self.or1_token.to_tokens(tokens); | |
3046 | self.inputs.to_tokens(tokens); | |
3047 | self.or2_token.to_tokens(tokens); | |
3048 | self.output.to_tokens(tokens); | |
3049 | self.body.to_tokens(tokens); | |
3050 | } | |
3051 | } | |
3052 | ||
3053 | #[cfg(feature = "full")] | |
5869c6ff | 3054 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3055 | impl ToTokens for ExprUnsafe { |
3056 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3057 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3058 | self.unsafe_token.to_tokens(tokens); | |
3059 | self.block.brace_token.surround(tokens, |tokens| { | |
3060 | inner_attrs_to_tokens(&self.attrs, tokens); | |
3061 | tokens.append_all(&self.block.stmts); | |
3062 | }); | |
3063 | } | |
3064 | } | |
3065 | ||
3066 | #[cfg(feature = "full")] | |
5869c6ff | 3067 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3068 | impl ToTokens for ExprBlock { |
3069 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3070 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3071 | self.label.to_tokens(tokens); | |
3072 | self.block.brace_token.surround(tokens, |tokens| { | |
3073 | inner_attrs_to_tokens(&self.attrs, tokens); | |
3074 | tokens.append_all(&self.block.stmts); | |
3075 | }); | |
3076 | } | |
3077 | } | |
3078 | ||
3079 | #[cfg(feature = "full")] | |
5869c6ff | 3080 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3081 | impl ToTokens for ExprAssign { |
3082 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3083 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3084 | self.left.to_tokens(tokens); | |
3085 | self.eq_token.to_tokens(tokens); | |
3086 | self.right.to_tokens(tokens); | |
3087 | } | |
3088 | } | |
3089 | ||
3090 | #[cfg(feature = "full")] | |
5869c6ff | 3091 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3092 | impl ToTokens for ExprAssignOp { |
3093 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3094 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3095 | self.left.to_tokens(tokens); | |
3096 | self.op.to_tokens(tokens); | |
3097 | self.right.to_tokens(tokens); | |
3098 | } | |
3099 | } | |
3100 | ||
5869c6ff | 3101 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3102 | impl ToTokens for ExprField { |
3103 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3104 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3105 | self.base.to_tokens(tokens); | |
3106 | self.dot_token.to_tokens(tokens); | |
3107 | self.member.to_tokens(tokens); | |
3108 | } | |
3109 | } | |
3110 | ||
5869c6ff | 3111 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3112 | impl ToTokens for Member { |
3113 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3114 | match self { | |
3115 | Member::Named(ident) => ident.to_tokens(tokens), | |
3116 | Member::Unnamed(index) => index.to_tokens(tokens), | |
3117 | } | |
3118 | } | |
3119 | } | |
3120 | ||
5869c6ff | 3121 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3122 | impl ToTokens for Index { |
3123 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3124 | let mut lit = Literal::i64_unsuffixed(i64::from(self.index)); | |
3125 | lit.set_span(self.span); | |
3126 | tokens.append(lit); | |
3127 | } | |
3128 | } | |
3129 | ||
5869c6ff | 3130 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3131 | impl ToTokens for ExprIndex { |
3132 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3133 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3134 | self.expr.to_tokens(tokens); | |
3135 | self.bracket_token.surround(tokens, |tokens| { | |
3136 | self.index.to_tokens(tokens); | |
3137 | }); | |
3138 | } | |
3139 | } | |
3140 | ||
3141 | #[cfg(feature = "full")] | |
5869c6ff | 3142 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3143 | impl ToTokens for ExprRange { |
3144 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3145 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3146 | self.from.to_tokens(tokens); | |
3147 | match &self.limits { | |
3148 | RangeLimits::HalfOpen(t) => t.to_tokens(tokens), | |
3149 | RangeLimits::Closed(t) => t.to_tokens(tokens), | |
3150 | } | |
3151 | self.to.to_tokens(tokens); | |
3152 | } | |
3153 | } | |
3154 | ||
5869c6ff | 3155 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3156 | impl ToTokens for ExprPath { |
3157 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3158 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3159 | private::print_path(tokens, &self.qself, &self.path); | |
3160 | } | |
3161 | } | |
3162 | ||
3163 | #[cfg(feature = "full")] | |
5869c6ff | 3164 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3165 | impl ToTokens for ExprReference { |
3166 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3167 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3168 | self.and_token.to_tokens(tokens); | |
3169 | self.mutability.to_tokens(tokens); | |
3170 | self.expr.to_tokens(tokens); | |
3171 | } | |
3172 | } | |
3173 | ||
3174 | #[cfg(feature = "full")] | |
5869c6ff | 3175 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3176 | impl ToTokens for ExprBreak { |
3177 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3178 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3179 | self.break_token.to_tokens(tokens); | |
3180 | self.label.to_tokens(tokens); | |
3181 | self.expr.to_tokens(tokens); | |
3182 | } | |
3183 | } | |
3184 | ||
3185 | #[cfg(feature = "full")] | |
5869c6ff | 3186 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3187 | impl ToTokens for ExprContinue { |
3188 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3189 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3190 | self.continue_token.to_tokens(tokens); | |
3191 | self.label.to_tokens(tokens); | |
3192 | } | |
3193 | } | |
3194 | ||
3195 | #[cfg(feature = "full")] | |
5869c6ff | 3196 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3197 | impl ToTokens for ExprReturn { |
3198 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3199 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3200 | self.return_token.to_tokens(tokens); | |
3201 | self.expr.to_tokens(tokens); | |
3202 | } | |
3203 | } | |
3204 | ||
3205 | #[cfg(feature = "full")] | |
5869c6ff | 3206 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3207 | impl ToTokens for ExprMacro { |
3208 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3209 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3210 | self.mac.to_tokens(tokens); | |
3211 | } | |
3212 | } | |
3213 | ||
3214 | #[cfg(feature = "full")] | |
5869c6ff | 3215 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3216 | impl ToTokens for ExprStruct { |
3217 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3218 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3219 | self.path.to_tokens(tokens); | |
3220 | self.brace_token.surround(tokens, |tokens| { | |
3221 | inner_attrs_to_tokens(&self.attrs, tokens); | |
3222 | self.fields.to_tokens(tokens); | |
5869c6ff XL |
3223 | if let Some(dot2_token) = &self.dot2_token { |
3224 | dot2_token.to_tokens(tokens); | |
3225 | } else if self.rest.is_some() { | |
3226 | Token![..](Span::call_site()).to_tokens(tokens); | |
e74abb32 | 3227 | } |
5869c6ff | 3228 | self.rest.to_tokens(tokens); |
e74abb32 XL |
3229 | }) |
3230 | } | |
3231 | } | |
3232 | ||
3233 | #[cfg(feature = "full")] | |
5869c6ff | 3234 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3235 | impl ToTokens for ExprRepeat { |
3236 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3237 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3238 | self.bracket_token.surround(tokens, |tokens| { | |
3239 | inner_attrs_to_tokens(&self.attrs, tokens); | |
3240 | self.expr.to_tokens(tokens); | |
3241 | self.semi_token.to_tokens(tokens); | |
3242 | self.len.to_tokens(tokens); | |
3243 | }) | |
3244 | } | |
3245 | } | |
3246 | ||
3247 | #[cfg(feature = "full")] | |
5869c6ff | 3248 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3249 | impl ToTokens for ExprGroup { |
3250 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3251 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3252 | self.group_token.surround(tokens, |tokens| { | |
3253 | self.expr.to_tokens(tokens); | |
3254 | }); | |
3255 | } | |
3256 | } | |
3257 | ||
5869c6ff | 3258 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3259 | impl ToTokens for ExprParen { |
3260 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3261 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3262 | self.paren_token.surround(tokens, |tokens| { | |
3263 | inner_attrs_to_tokens(&self.attrs, tokens); | |
3264 | self.expr.to_tokens(tokens); | |
3265 | }); | |
3266 | } | |
3267 | } | |
3268 | ||
3269 | #[cfg(feature = "full")] | |
5869c6ff | 3270 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3271 | impl ToTokens for ExprTry { |
3272 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3273 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3274 | self.expr.to_tokens(tokens); | |
3275 | self.question_token.to_tokens(tokens); | |
3276 | } | |
3277 | } | |
3278 | ||
3279 | #[cfg(feature = "full")] | |
5869c6ff | 3280 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3281 | impl ToTokens for Label { |
3282 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3283 | self.name.to_tokens(tokens); | |
3284 | self.colon_token.to_tokens(tokens); | |
3285 | } | |
3286 | } | |
3287 | ||
3288 | #[cfg(feature = "full")] | |
5869c6ff | 3289 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3290 | impl ToTokens for FieldValue { |
3291 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3292 | outer_attrs_to_tokens(&self.attrs, tokens); | |
3293 | self.member.to_tokens(tokens); | |
3294 | if let Some(colon_token) = &self.colon_token { | |
3295 | colon_token.to_tokens(tokens); | |
3296 | self.expr.to_tokens(tokens); | |
3297 | } | |
3298 | } | |
3299 | } | |
3300 | ||
3301 | #[cfg(feature = "full")] | |
5869c6ff | 3302 | #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))] |
e74abb32 XL |
3303 | impl ToTokens for Arm { |
3304 | fn to_tokens(&self, tokens: &mut TokenStream) { | |
3305 | tokens.append_all(&self.attrs); | |
3306 | self.pat.to_tokens(tokens); | |
3307 | if let Some((if_token, guard)) = &self.guard { | |
3308 | if_token.to_tokens(tokens); | |
3309 | guard.to_tokens(tokens); | |
3310 | } | |
3311 | self.fat_arrow_token.to_tokens(tokens); | |
3312 | self.body.to_tokens(tokens); | |
3313 | self.comma.to_tokens(tokens); | |
3314 | } | |
3315 | } | |
3316 | } |