1 extern crate rustc_ast;
2 extern crate rustc_data_structures;
3 extern crate rustc_span;
4
5 use rustc_ast::ast::{
6 AngleBracketedArg, AngleBracketedArgs, AnonConst, Arm, AssocItemKind, AssocTyConstraint,
7 AssocTyConstraintKind, Async, AttrId, AttrItem, AttrKind, AttrStyle, Attribute, BareFnTy,
8 BinOpKind, BindingMode, Block, BlockCheckMode, BorrowKind, CaptureBy, Const, Crate, CrateSugar,
9 Defaultness, EnumDef, Expr, ExprField, ExprKind, Extern, FieldDef, FloatTy, Fn, FnDecl,
10 FnHeader, FnRetTy, FnSig, ForeignItemKind, ForeignMod, GenericArg, GenericArgs, GenericBound,
11 GenericParam, GenericParamKind, Generics, Impl, ImplPolarity, Inline, InlineAsm,
12 InlineAsmOperand, InlineAsmOptions, InlineAsmRegOrRegClass, InlineAsmTemplatePiece, IntTy,
13 IsAuto, Item, ItemKind, Label, Lifetime, Lit, LitFloatType, LitIntType, LitKind,
14 LlvmAsmDialect, LlvmInlineAsm, LlvmInlineAsmOutput, Local, LocalKind, MacArgs, MacCall,
15 MacCallStmt, MacDelimiter, MacStmtStyle, MacroDef, ModKind, Movability, MutTy, Mutability,
16 NodeId, Param, ParenthesizedArgs, Pat, PatField, PatKind, Path, PathSegment, PolyTraitRef,
17 QSelf, RangeEnd, RangeLimits, RangeSyntax, Stmt, StmtKind, StrLit, StrStyle, StructExpr,
18 StructRest, Trait, TraitBoundModifier, TraitObjectSyntax, TraitRef, Ty, TyAlias, TyKind,
19 UintTy, UnOp, Unsafe, UnsafeSource, UseTree, UseTreeKind, Variant, VariantData, Visibility,
20 VisibilityKind, WhereBoundPredicate, WhereClause, WhereEqPredicate, WherePredicate,
21 WhereRegionPredicate,
22 };
23 use rustc_ast::ptr::P;
24 use rustc_ast::token::{self, CommentKind, DelimToken, Nonterminal, Token, TokenKind};
25 use rustc_ast::tokenstream::{
26 AttrAnnotatedTokenStream, AttrAnnotatedTokenTree, AttributesData, DelimSpan, LazyTokenStream,
27 Spacing, TokenStream, TokenTree,
28 };
29 use rustc_data_structures::sync::Lrc;
30 use rustc_data_structures::thin_vec::ThinVec;
31 use rustc_span::source_map::Spanned;
32 use rustc_span::symbol::{sym, Ident};
33 use rustc_span::{Span, Symbol, SyntaxContext, DUMMY_SP};
34
35 pub trait SpanlessEq {
eq(&self, other: &Self) -> bool36 fn eq(&self, other: &Self) -> bool;
37 }
38
39 impl<T: ?Sized + SpanlessEq> SpanlessEq for Box<T> {
eq(&self, other: &Self) -> bool40 fn eq(&self, other: &Self) -> bool {
41 SpanlessEq::eq(&**self, &**other)
42 }
43 }
44
45 impl<T: SpanlessEq> SpanlessEq for P<T> {
eq(&self, other: &Self) -> bool46 fn eq(&self, other: &Self) -> bool {
47 SpanlessEq::eq(&**self, &**other)
48 }
49 }
50
51 impl<T: ?Sized + SpanlessEq> SpanlessEq for Lrc<T> {
eq(&self, other: &Self) -> bool52 fn eq(&self, other: &Self) -> bool {
53 SpanlessEq::eq(&**self, &**other)
54 }
55 }
56
57 impl<T: SpanlessEq> SpanlessEq for Option<T> {
eq(&self, other: &Self) -> bool58 fn eq(&self, other: &Self) -> bool {
59 match (self, other) {
60 (None, None) => true,
61 (Some(this), Some(other)) => SpanlessEq::eq(this, other),
62 _ => false,
63 }
64 }
65 }
66
67 impl<T: SpanlessEq> SpanlessEq for [T] {
eq(&self, other: &Self) -> bool68 fn eq(&self, other: &Self) -> bool {
69 self.len() == other.len() && self.iter().zip(other).all(|(a, b)| SpanlessEq::eq(a, b))
70 }
71 }
72
73 impl<T: SpanlessEq> SpanlessEq for Vec<T> {
eq(&self, other: &Self) -> bool74 fn eq(&self, other: &Self) -> bool {
75 <[T] as SpanlessEq>::eq(self, other)
76 }
77 }
78
79 impl<T: SpanlessEq> SpanlessEq for ThinVec<T> {
eq(&self, other: &Self) -> bool80 fn eq(&self, other: &Self) -> bool {
81 self.len() == other.len()
82 && self
83 .iter()
84 .zip(other.iter())
85 .all(|(a, b)| SpanlessEq::eq(a, b))
86 }
87 }
88
89 impl<T: SpanlessEq> SpanlessEq for Spanned<T> {
eq(&self, other: &Self) -> bool90 fn eq(&self, other: &Self) -> bool {
91 SpanlessEq::eq(&self.node, &other.node)
92 }
93 }
94
95 impl<A: SpanlessEq, B: SpanlessEq> SpanlessEq for (A, B) {
eq(&self, other: &Self) -> bool96 fn eq(&self, other: &Self) -> bool {
97 SpanlessEq::eq(&self.0, &other.0) && SpanlessEq::eq(&self.1, &other.1)
98 }
99 }
100
101 impl<A: SpanlessEq, B: SpanlessEq, C: SpanlessEq> SpanlessEq for (A, B, C) {
eq(&self, other: &Self) -> bool102 fn eq(&self, other: &Self) -> bool {
103 SpanlessEq::eq(&self.0, &other.0)
104 && SpanlessEq::eq(&self.1, &other.1)
105 && SpanlessEq::eq(&self.2, &other.2)
106 }
107 }
108
109 macro_rules! spanless_eq_true {
110 ($name:ty) => {
111 impl SpanlessEq for $name {
112 fn eq(&self, _other: &Self) -> bool {
113 true
114 }
115 }
116 };
117 }
118
119 spanless_eq_true!(Span);
120 spanless_eq_true!(DelimSpan);
121 spanless_eq_true!(AttrId);
122 spanless_eq_true!(NodeId);
123 spanless_eq_true!(SyntaxContext);
124 spanless_eq_true!(Spacing);
125
126 macro_rules! spanless_eq_partial_eq {
127 ($name:ty) => {
128 impl SpanlessEq for $name {
129 fn eq(&self, other: &Self) -> bool {
130 PartialEq::eq(self, other)
131 }
132 }
133 };
134 }
135
136 spanless_eq_partial_eq!(bool);
137 spanless_eq_partial_eq!(u8);
138 spanless_eq_partial_eq!(u16);
139 spanless_eq_partial_eq!(u128);
140 spanless_eq_partial_eq!(usize);
141 spanless_eq_partial_eq!(char);
142 spanless_eq_partial_eq!(String);
143 spanless_eq_partial_eq!(Symbol);
144 spanless_eq_partial_eq!(CommentKind);
145 spanless_eq_partial_eq!(DelimToken);
146 spanless_eq_partial_eq!(InlineAsmOptions);
147 spanless_eq_partial_eq!(token::LitKind);
148
149 macro_rules! spanless_eq_struct {
150 {
151 $($name:ident)::+ $(<$param:ident>)?
152 $([$field:tt $this:ident $other:ident])*
153 $(![$ignore:tt])*;
154 } => {
155 impl $(<$param: SpanlessEq>)* SpanlessEq for $($name)::+ $(<$param>)* {
156 fn eq(&self, other: &Self) -> bool {
157 let $($name)::+ { $($field: $this,)* $($ignore: _,)* } = self;
158 let $($name)::+ { $($field: $other,)* $($ignore: _,)* } = other;
159 true $(&& SpanlessEq::eq($this, $other))*
160 }
161 }
162 };
163
164 {
165 $($name:ident)::+ $(<$param:ident>)?
166 $([$field:tt $this:ident $other:ident])*
167 $(![$ignore:tt])*;
168 !$next:tt
169 $($rest:tt)*
170 } => {
171 spanless_eq_struct! {
172 $($name)::+ $(<$param>)*
173 $([$field $this $other])*
174 $(![$ignore])*
175 ![$next];
176 $($rest)*
177 }
178 };
179
180 {
181 $($name:ident)::+ $(<$param:ident>)?
182 $([$field:tt $this:ident $other:ident])*
183 $(![$ignore:tt])*;
184 $next:tt
185 $($rest:tt)*
186 } => {
187 spanless_eq_struct! {
188 $($name)::+ $(<$param>)*
189 $([$field $this $other])*
190 [$next this other]
191 $(![$ignore])*;
192 $($rest)*
193 }
194 };
195 }
196
197 macro_rules! spanless_eq_enum {
198 {
199 $($name:ident)::+;
200 $([$($variant:ident)::+; $([$field:tt $this:ident $other:ident])* $(![$ignore:tt])*])*
201 } => {
202 impl SpanlessEq for $($name)::+ {
203 fn eq(&self, other: &Self) -> bool {
204 match self {
205 $(
206 $($variant)::+ { .. } => {}
207 )*
208 }
209 #[allow(unreachable_patterns)]
210 match (self, other) {
211 $(
212 (
213 $($variant)::+ { $($field: $this,)* $($ignore: _,)* },
214 $($variant)::+ { $($field: $other,)* $($ignore: _,)* },
215 ) => {
216 true $(&& SpanlessEq::eq($this, $other))*
217 }
218 )*
219 _ => false,
220 }
221 }
222 }
223 };
224
225 {
226 $($name:ident)::+;
227 $([$($variant:ident)::+; $($fields:tt)*])*
228 $next:ident [$([$($named:tt)*])* $(![$ignore:tt])*] (!$i:tt $($field:tt)*)
229 $($rest:tt)*
230 } => {
231 spanless_eq_enum! {
232 $($name)::+;
233 $([$($variant)::+; $($fields)*])*
234 $next [$([$($named)*])* $(![$ignore])* ![$i]] ($($field)*)
235 $($rest)*
236 }
237 };
238
239 {
240 $($name:ident)::+;
241 $([$($variant:ident)::+; $($fields:tt)*])*
242 $next:ident [$([$($named:tt)*])* $(![$ignore:tt])*] ($i:tt $($field:tt)*)
243 $($rest:tt)*
244 } => {
245 spanless_eq_enum! {
246 $($name)::+;
247 $([$($variant)::+; $($fields)*])*
248 $next [$([$($named)*])* [$i this other] $(![$ignore])*] ($($field)*)
249 $($rest)*
250 }
251 };
252
253 {
254 $($name:ident)::+;
255 $([$($variant:ident)::+; $($fields:tt)*])*
256 $next:ident [$($named:tt)*] ()
257 $($rest:tt)*
258 } => {
259 spanless_eq_enum! {
260 $($name)::+;
261 $([$($variant)::+; $($fields)*])*
262 [$($name)::+::$next; $($named)*]
263 $($rest)*
264 }
265 };
266
267 {
268 $($name:ident)::+;
269 $([$($variant:ident)::+; $($fields:tt)*])*
270 $next:ident ($($field:tt)*)
271 $($rest:tt)*
272 } => {
273 spanless_eq_enum! {
274 $($name)::+;
275 $([$($variant)::+; $($fields)*])*
276 $next [] ($($field)*)
277 $($rest)*
278 }
279 };
280
281 {
282 $($name:ident)::+;
283 $([$($variant:ident)::+; $($fields:tt)*])*
284 $next:ident
285 $($rest:tt)*
286 } => {
287 spanless_eq_enum! {
288 $($name)::+;
289 $([$($variant)::+; $($fields)*])*
290 [$($name)::+::$next;]
291 $($rest)*
292 }
293 };
294 }
295
296 spanless_eq_struct!(AngleBracketedArgs; span args);
297 spanless_eq_struct!(AnonConst; id value);
298 spanless_eq_struct!(Arm; attrs pat guard body span id is_placeholder);
299 spanless_eq_struct!(AssocTyConstraint; id ident gen_args kind span);
300 spanless_eq_struct!(AttrAnnotatedTokenStream; 0);
301 spanless_eq_struct!(AttrItem; path args tokens);
302 spanless_eq_struct!(Attribute; kind id style span);
303 spanless_eq_struct!(AttributesData; attrs tokens);
304 spanless_eq_struct!(BareFnTy; unsafety ext generic_params decl);
305 spanless_eq_struct!(Block; stmts id rules span tokens could_be_bare_literal);
306 spanless_eq_struct!(Crate; attrs items span id is_placeholder);
307 spanless_eq_struct!(EnumDef; variants);
308 spanless_eq_struct!(Expr; id kind span attrs !tokens);
309 spanless_eq_struct!(ExprField; attrs id span ident expr is_shorthand is_placeholder);
310 spanless_eq_struct!(FieldDef; attrs id span vis ident ty is_placeholder);
311 spanless_eq_struct!(FnDecl; inputs output);
312 spanless_eq_struct!(FnHeader; constness asyncness unsafety ext);
313 spanless_eq_struct!(Fn; defaultness generics sig body);
314 spanless_eq_struct!(FnSig; header decl span);
315 spanless_eq_struct!(ForeignMod; unsafety abi items);
316 spanless_eq_struct!(GenericParam; id ident attrs bounds is_placeholder kind);
317 spanless_eq_struct!(Generics; params where_clause span);
318 spanless_eq_struct!(Impl; defaultness unsafety generics constness polarity of_trait self_ty items);
319 spanless_eq_struct!(InlineAsm; template template_strs operands clobber_abis options line_spans);
320 spanless_eq_struct!(Item<K>; attrs id span vis ident kind !tokens);
321 spanless_eq_struct!(Label; ident);
322 spanless_eq_struct!(Lifetime; id ident);
323 spanless_eq_struct!(Lit; token kind span);
324 spanless_eq_struct!(LlvmInlineAsm; asm asm_str_style outputs inputs clobbers volatile alignstack dialect);
325 spanless_eq_struct!(LlvmInlineAsmOutput; constraint expr is_rw is_indirect);
326 spanless_eq_struct!(Local; pat ty kind id span attrs !tokens);
327 spanless_eq_struct!(MacCall; path args prior_type_ascription);
328 spanless_eq_struct!(MacCallStmt; mac style attrs tokens);
329 spanless_eq_struct!(MacroDef; body macro_rules);
330 spanless_eq_struct!(MutTy; ty mutbl);
331 spanless_eq_struct!(ParenthesizedArgs; span inputs inputs_span output);
332 spanless_eq_struct!(Pat; id kind span tokens);
333 spanless_eq_struct!(PatField; ident pat is_shorthand attrs id span is_placeholder);
334 spanless_eq_struct!(Path; span segments tokens);
335 spanless_eq_struct!(PathSegment; ident id args);
336 spanless_eq_struct!(PolyTraitRef; bound_generic_params trait_ref span);
337 spanless_eq_struct!(QSelf; ty path_span position);
338 spanless_eq_struct!(Stmt; id kind span);
339 spanless_eq_struct!(StrLit; style symbol suffix span symbol_unescaped);
340 spanless_eq_struct!(StructExpr; qself path fields rest);
341 spanless_eq_struct!(Token; kind span);
342 spanless_eq_struct!(Trait; unsafety is_auto generics bounds items);
343 spanless_eq_struct!(TraitRef; path ref_id);
344 spanless_eq_struct!(Ty; id kind span tokens);
345 spanless_eq_struct!(TyAlias; defaultness generics bounds ty);
346 spanless_eq_struct!(UseTree; prefix kind span);
347 spanless_eq_struct!(Variant; attrs id span !vis ident data disr_expr is_placeholder);
348 spanless_eq_struct!(Visibility; kind span tokens);
349 spanless_eq_struct!(WhereBoundPredicate; span bound_generic_params bounded_ty bounds);
350 spanless_eq_struct!(WhereClause; has_where_token predicates span);
351 spanless_eq_struct!(WhereEqPredicate; id span lhs_ty rhs_ty);
352 spanless_eq_struct!(WhereRegionPredicate; span lifetime bounds);
353 spanless_eq_struct!(token::Lit; kind symbol suffix);
354 spanless_eq_enum!(AngleBracketedArg; Arg(0) Constraint(0));
355 spanless_eq_enum!(AssocItemKind; Const(0 1 2) Fn(0) TyAlias(0) MacCall(0));
356 spanless_eq_enum!(AssocTyConstraintKind; Equality(ty) Bound(bounds));
357 spanless_eq_enum!(Async; Yes(span closure_id return_impl_trait_id) No);
358 spanless_eq_enum!(AttrAnnotatedTokenTree; Token(0) Delimited(0 1 2) Attributes(0));
359 spanless_eq_enum!(AttrStyle; Outer Inner);
360 spanless_eq_enum!(BinOpKind; Add Sub Mul Div Rem And Or BitXor BitAnd BitOr Shl Shr Eq Lt Le Ne Ge Gt);
361 spanless_eq_enum!(BindingMode; ByRef(0) ByValue(0));
362 spanless_eq_enum!(BlockCheckMode; Default Unsafe(0));
363 spanless_eq_enum!(BorrowKind; Ref Raw);
364 spanless_eq_enum!(CaptureBy; Value Ref);
365 spanless_eq_enum!(Const; Yes(0) No);
366 spanless_eq_enum!(CrateSugar; PubCrate JustCrate);
367 spanless_eq_enum!(Defaultness; Default(0) Final);
368 spanless_eq_enum!(Extern; None Implicit Explicit(0));
369 spanless_eq_enum!(FloatTy; F32 F64);
370 spanless_eq_enum!(FnRetTy; Default(0) Ty(0));
371 spanless_eq_enum!(ForeignItemKind; Static(0 1 2) Fn(0) TyAlias(0) MacCall(0));
372 spanless_eq_enum!(GenericArg; Lifetime(0) Type(0) Const(0));
373 spanless_eq_enum!(GenericArgs; AngleBracketed(0) Parenthesized(0));
374 spanless_eq_enum!(GenericBound; Trait(0 1) Outlives(0));
375 spanless_eq_enum!(GenericParamKind; Lifetime Type(default) Const(ty kw_span default));
376 spanless_eq_enum!(ImplPolarity; Positive Negative(0));
377 spanless_eq_enum!(Inline; Yes No);
378 spanless_eq_enum!(InlineAsmRegOrRegClass; Reg(0) RegClass(0));
379 spanless_eq_enum!(InlineAsmTemplatePiece; String(0) Placeholder(operand_idx modifier span));
380 spanless_eq_enum!(IntTy; Isize I8 I16 I32 I64 I128);
381 spanless_eq_enum!(IsAuto; Yes No);
382 spanless_eq_enum!(LitFloatType; Suffixed(0) Unsuffixed);
383 spanless_eq_enum!(LitIntType; Signed(0) Unsigned(0) Unsuffixed);
384 spanless_eq_enum!(LlvmAsmDialect; Att Intel);
385 spanless_eq_enum!(LocalKind; Decl Init(0) InitElse(0 1));
386 spanless_eq_enum!(MacArgs; Empty Delimited(0 1 2) Eq(0 1));
387 spanless_eq_enum!(MacDelimiter; Parenthesis Bracket Brace);
388 spanless_eq_enum!(MacStmtStyle; Semicolon Braces NoBraces);
389 spanless_eq_enum!(ModKind; Loaded(0 1 2) Unloaded);
390 spanless_eq_enum!(Movability; Static Movable);
391 spanless_eq_enum!(Mutability; Mut Not);
392 spanless_eq_enum!(RangeEnd; Included(0) Excluded);
393 spanless_eq_enum!(RangeLimits; HalfOpen Closed);
394 spanless_eq_enum!(StmtKind; Local(0) Item(0) Expr(0) Semi(0) Empty MacCall(0));
395 spanless_eq_enum!(StrStyle; Cooked Raw(0));
396 spanless_eq_enum!(StructRest; Base(0) Rest(0) None);
397 spanless_eq_enum!(TokenTree; Token(0) Delimited(0 1 2));
398 spanless_eq_enum!(TraitBoundModifier; None Maybe MaybeConst MaybeConstMaybe);
399 spanless_eq_enum!(TraitObjectSyntax; Dyn None);
400 spanless_eq_enum!(UintTy; Usize U8 U16 U32 U64 U128);
401 spanless_eq_enum!(UnOp; Deref Not Neg);
402 spanless_eq_enum!(Unsafe; Yes(0) No);
403 spanless_eq_enum!(UnsafeSource; CompilerGenerated UserProvided);
404 spanless_eq_enum!(UseTreeKind; Simple(0 1 2) Nested(0) Glob);
405 spanless_eq_enum!(VariantData; Struct(0 1) Tuple(0 1) Unit(0));
406 spanless_eq_enum!(VisibilityKind; Public Crate(0) Restricted(path id) Inherited);
407 spanless_eq_enum!(WherePredicate; BoundPredicate(0) RegionPredicate(0) EqPredicate(0));
408 spanless_eq_enum!(ExprKind; Box(0) Array(0) ConstBlock(0) Call(0 1)
409 MethodCall(0 1 2) Tup(0) Binary(0 1 2) Unary(0 1) Lit(0) Cast(0 1) Type(0 1)
410 Let(0 1 2) If(0 1 2) While(0 1 2) ForLoop(0 1 2 3) Loop(0 1) Match(0 1)
411 Closure(0 1 2 3 4 5) Block(0 1) Async(0 1 2) Await(0) TryBlock(0)
412 Assign(0 1 2) AssignOp(0 1 2) Field(0 1) Index(0 1) Underscore Range(0 1 2)
413 Path(0 1) AddrOf(0 1 2) Break(0 1) Continue(0) Ret(0) InlineAsm(0)
414 LlvmInlineAsm(0) MacCall(0) Struct(0) Repeat(0 1) Paren(0) Try(0) Yield(0)
415 Err);
416 spanless_eq_enum!(InlineAsmOperand; In(reg expr) Out(reg late expr)
417 InOut(reg late expr) SplitInOut(reg late in_expr out_expr) Const(anon_const)
418 Sym(expr));
419 spanless_eq_enum!(ItemKind; ExternCrate(0) Use(0) Static(0 1 2) Const(0 1 2)
420 Fn(0) Mod(0 1) ForeignMod(0) GlobalAsm(0) TyAlias(0) Enum(0 1) Struct(0 1)
421 Union(0 1) Trait(0) TraitAlias(0 1) Impl(0) MacCall(0) MacroDef(0));
422 spanless_eq_enum!(LitKind; Str(0 1) ByteStr(0) Byte(0) Char(0) Int(0 1)
423 Float(0 1) Bool(0) Err(0));
424 spanless_eq_enum!(PatKind; Wild Ident(0 1 2) Struct(0 1 2 3) TupleStruct(0 1 2)
425 Or(0) Path(0 1) Tuple(0) Box(0) Ref(0 1) Lit(0) Range(0 1 2) Slice(0) Rest
426 Paren(0) MacCall(0));
427 spanless_eq_enum!(TyKind; Slice(0) Array(0 1) Ptr(0) Rptr(0 1) BareFn(0) Never
428 Tup(0) Path(0 1) TraitObject(0 1) ImplTrait(0 1) Paren(0) Typeof(0) Infer
429 ImplicitSelf MacCall(0) Err CVarArgs);
430
431 impl SpanlessEq for Ident {
eq(&self, other: &Self) -> bool432 fn eq(&self, other: &Self) -> bool {
433 self.as_str() == other.as_str()
434 }
435 }
436
437 impl SpanlessEq for RangeSyntax {
eq(&self, _other: &Self) -> bool438 fn eq(&self, _other: &Self) -> bool {
439 match self {
440 RangeSyntax::DotDotDot | RangeSyntax::DotDotEq => true,
441 }
442 }
443 }
444
445 impl SpanlessEq for Param {
eq(&self, other: &Self) -> bool446 fn eq(&self, other: &Self) -> bool {
447 let Param {
448 attrs,
449 ty,
450 pat,
451 id,
452 span: _,
453 is_placeholder,
454 } = self;
455 let Param {
456 attrs: attrs2,
457 ty: ty2,
458 pat: pat2,
459 id: id2,
460 span: _,
461 is_placeholder: is_placeholder2,
462 } = other;
463 SpanlessEq::eq(id, id2)
464 && SpanlessEq::eq(is_placeholder, is_placeholder2)
465 && (matches!(ty.kind, TyKind::Err)
466 || matches!(ty2.kind, TyKind::Err)
467 || SpanlessEq::eq(attrs, attrs2)
468 && SpanlessEq::eq(ty, ty2)
469 && SpanlessEq::eq(pat, pat2))
470 }
471 }
472
473 impl SpanlessEq for TokenKind {
eq(&self, other: &Self) -> bool474 fn eq(&self, other: &Self) -> bool {
475 match (self, other) {
476 (TokenKind::Literal(this), TokenKind::Literal(other)) => SpanlessEq::eq(this, other),
477 (TokenKind::DotDotEq, _) | (TokenKind::DotDotDot, _) => match other {
478 TokenKind::DotDotEq | TokenKind::DotDotDot => true,
479 _ => false,
480 },
481 (TokenKind::Interpolated(this), TokenKind::Interpolated(other)) => {
482 match (this.as_ref(), other.as_ref()) {
483 (Nonterminal::NtExpr(this), Nonterminal::NtExpr(other)) => {
484 SpanlessEq::eq(this, other)
485 }
486 _ => this == other,
487 }
488 }
489 _ => self == other,
490 }
491 }
492 }
493
494 impl SpanlessEq for TokenStream {
eq(&self, other: &Self) -> bool495 fn eq(&self, other: &Self) -> bool {
496 let mut this_trees = self.trees();
497 let mut other_trees = other.trees();
498 loop {
499 let this = match this_trees.next() {
500 None => return other_trees.next().is_none(),
501 Some(tree) => tree,
502 };
503 let other = match other_trees.next() {
504 None => return false,
505 Some(tree) => tree,
506 };
507 if SpanlessEq::eq(&this, &other) {
508 continue;
509 }
510 if let (TokenTree::Token(this), TokenTree::Token(other)) = (this, other) {
511 if match (&this.kind, &other.kind) {
512 (TokenKind::Literal(this), TokenKind::Literal(other)) => {
513 SpanlessEq::eq(this, other)
514 }
515 (TokenKind::DocComment(_kind, style, symbol), TokenKind::Pound) => {
516 doc_comment(*style, *symbol, &mut other_trees)
517 }
518 (TokenKind::Pound, TokenKind::DocComment(_kind, style, symbol)) => {
519 doc_comment(*style, *symbol, &mut this_trees)
520 }
521 _ => false,
522 } {
523 continue;
524 }
525 }
526 return false;
527 }
528 }
529 }
530
doc_comment( style: AttrStyle, unescaped: Symbol, trees: &mut impl Iterator<Item = TokenTree>, ) -> bool531 fn doc_comment(
532 style: AttrStyle,
533 unescaped: Symbol,
534 trees: &mut impl Iterator<Item = TokenTree>,
535 ) -> bool {
536 if match style {
537 AttrStyle::Outer => false,
538 AttrStyle::Inner => true,
539 } {
540 match trees.next() {
541 Some(TokenTree::Token(Token {
542 kind: TokenKind::Not,
543 span: _,
544 })) => {}
545 _ => return false,
546 }
547 }
548 let stream = match trees.next() {
549 Some(TokenTree::Delimited(_span, DelimToken::Bracket, stream)) => stream,
550 _ => return false,
551 };
552 let mut trees = stream.trees();
553 match trees.next() {
554 Some(TokenTree::Token(Token {
555 kind: TokenKind::Ident(symbol, false),
556 span: _,
557 })) if symbol == sym::doc => {}
558 _ => return false,
559 }
560 match trees.next() {
561 Some(TokenTree::Token(Token {
562 kind: TokenKind::Eq,
563 span: _,
564 })) => {}
565 _ => return false,
566 }
567 match trees.next() {
568 Some(TokenTree::Token(token)) => {
569 is_escaped_literal(&token, unescaped) && trees.next().is_none()
570 }
571 _ => false,
572 }
573 }
574
is_escaped_literal(token: &Token, unescaped: Symbol) -> bool575 fn is_escaped_literal(token: &Token, unescaped: Symbol) -> bool {
576 match match token {
577 Token {
578 kind: TokenKind::Literal(lit),
579 span: _,
580 } => Lit::from_lit_token(*lit, DUMMY_SP),
581 Token {
582 kind: TokenKind::Interpolated(nonterminal),
583 span: _,
584 } => match nonterminal.as_ref() {
585 Nonterminal::NtExpr(expr) => match &expr.kind {
586 ExprKind::Lit(lit) => Ok(lit.clone()),
587 _ => return false,
588 },
589 _ => return false,
590 },
591 _ => return false,
592 } {
593 Ok(Lit {
594 token:
595 token::Lit {
596 kind: token::LitKind::Str,
597 symbol: _,
598 suffix: None,
599 },
600 kind: LitKind::Str(symbol, StrStyle::Cooked),
601 span: _,
602 }) => symbol.as_str().replace('\r', "") == unescaped.as_str().replace('\r', ""),
603 _ => false,
604 }
605 }
606
607 impl SpanlessEq for LazyTokenStream {
eq(&self, other: &Self) -> bool608 fn eq(&self, other: &Self) -> bool {
609 let this = self.create_token_stream();
610 let other = other.create_token_stream();
611 SpanlessEq::eq(&this, &other)
612 }
613 }
614
615 impl SpanlessEq for AttrKind {
eq(&self, other: &Self) -> bool616 fn eq(&self, other: &Self) -> bool {
617 match (self, other) {
618 (AttrKind::Normal(item, tokens), AttrKind::Normal(item2, tokens2)) => {
619 SpanlessEq::eq(item, item2) && SpanlessEq::eq(tokens, tokens2)
620 }
621 (AttrKind::DocComment(kind, symbol), AttrKind::DocComment(kind2, symbol2)) => {
622 SpanlessEq::eq(kind, kind2) && SpanlessEq::eq(symbol, symbol2)
623 }
624 (AttrKind::DocComment(kind, unescaped), AttrKind::Normal(item2, _tokens)) => {
625 match kind {
626 CommentKind::Line | CommentKind::Block => {}
627 }
628 let path = Path::from_ident(Ident::with_dummy_span(sym::doc));
629 SpanlessEq::eq(&path, &item2.path)
630 && match &item2.args {
631 MacArgs::Empty | MacArgs::Delimited(..) => false,
632 MacArgs::Eq(_span, token) => is_escaped_literal(token, *unescaped),
633 }
634 }
635 (AttrKind::Normal(..), AttrKind::DocComment(..)) => SpanlessEq::eq(other, self),
636 }
637 }
638 }
639