1use crate::detection::inside_proc_macro;
2use crate::fallback::{self, FromStr2 as _};
3#[cfg(span_locations)]
4use crate::location::LineColumn;
5use crate::{Delimiter, Punct, Spacing, TokenTree};
6use core::fmt::{self, Debug, Display};
7#[cfg(span_locations)]
8use core::ops::Range;
9use core::ops::RangeBounds;
10use std::ffi::CStr;
11#[cfg(super_unstable)]
12use std::path::PathBuf;
13
14#[derive(Clone)]
15pub(crate) enum TokenStream {
16 Compiler(DeferredTokenStream),
17 Fallback(fallback::TokenStream),
18}
19
20// Work around https://github.com/rust-lang/rust/issues/65080.
21// In `impl Extend<TokenTree> for TokenStream` which is used heavily by quote,
22// we hold on to the appended tokens and do proc_macro::TokenStream::extend as
23// late as possible to batch together consecutive uses of the Extend impl.
24#[derive(Clone)]
25pub(crate) struct DeferredTokenStream {
26 stream: proc_macro::TokenStream,
27 extra: Vec<proc_macro::TokenTree>,
28}
29
30pub(crate) enum LexError {
31 Compiler(proc_macro::LexError),
32 Fallback(fallback::LexError),
33
34 // Rustc was supposed to return a LexError, but it panicked instead.
35 // https://github.com/rust-lang/rust/issues/58736
36 CompilerPanic,
37}
38
39#[cold]
40fn mismatch(line: u32) -> ! {
41 #[cfg(procmacro2_backtrace)]
42 {
43 let backtrace = std::backtrace::Backtrace::force_capture();
44 panic!("compiler/fallback mismatch L{}\n\n{}", line, backtrace)
45 }
46 #[cfg(not(procmacro2_backtrace))]
47 {
48 panic!("compiler/fallback mismatch L{}", line)
49 }
50}
51
52impl DeferredTokenStream {
53 fn new(stream: proc_macro::TokenStream) -> Self {
54 DeferredTokenStream {
55 stream,
56 extra: Vec::new(),
57 }
58 }
59
60 fn is_empty(&self) -> bool {
61 self.stream.is_empty() && self.extra.is_empty()
62 }
63
64 fn evaluate_now(&mut self) {
65 // If-check provides a fast short circuit for the common case of `extra`
66 // being empty, which saves a round trip over the proc macro bridge.
67 // Improves macro expansion time in winrt by 6% in debug mode.
68 if !self.extra.is_empty() {
69 self.stream.extend(self.extra.drain(..));
70 }
71 }
72
73 fn into_token_stream(mut self) -> proc_macro::TokenStream {
74 self.evaluate_now();
75 self.stream
76 }
77}
78
79impl TokenStream {
80 pub(crate) fn new() -> Self {
81 if inside_proc_macro() {
82 TokenStream::Compiler(DeferredTokenStream::new(proc_macro::TokenStream::new()))
83 } else {
84 TokenStream::Fallback(fallback::TokenStream::new())
85 }
86 }
87
88 pub(crate) fn from_str_checked(src: &str) -> Result<Self, LexError> {
89 if inside_proc_macro() {
90 Ok(TokenStream::Compiler(DeferredTokenStream::new(
91 proc_macro::TokenStream::from_str_checked(src)?,
92 )))
93 } else {
94 Ok(TokenStream::Fallback(
95 fallback::TokenStream::from_str_checked(src)?,
96 ))
97 }
98 }
99
100 pub(crate) fn is_empty(&self) -> bool {
101 match self {
102 TokenStream::Compiler(tts) => tts.is_empty(),
103 TokenStream::Fallback(tts) => tts.is_empty(),
104 }
105 }
106
107 fn unwrap_nightly(self) -> proc_macro::TokenStream {
108 match self {
109 TokenStream::Compiler(s) => s.into_token_stream(),
110 TokenStream::Fallback(_) => mismatch(line!()),
111 }
112 }
113
114 fn unwrap_stable(self) -> fallback::TokenStream {
115 match self {
116 TokenStream::Compiler(_) => mismatch(line!()),
117 TokenStream::Fallback(s) => s,
118 }
119 }
120}
121
122impl Display for TokenStream {
123 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
124 match self {
125 TokenStream::Compiler(tts: &DeferredTokenStream) => Display::fmt(&tts.clone().into_token_stream(), f),
126 TokenStream::Fallback(tts: &TokenStream) => Display::fmt(self:tts, f),
127 }
128 }
129}
130
131impl From<proc_macro::TokenStream> for TokenStream {
132 fn from(inner: proc_macro::TokenStream) -> Self {
133 TokenStream::Compiler(DeferredTokenStream::new(stream:inner))
134 }
135}
136
137impl From<TokenStream> for proc_macro::TokenStream {
138 fn from(inner: TokenStream) -> Self {
139 match inner {
140 TokenStream::Compiler(inner: DeferredTokenStream) => inner.into_token_stream(),
141 TokenStream::Fallback(inner: TokenStream) => {
142 proc_macro::TokenStream::from_str_unchecked(&inner.to_string())
143 }
144 }
145 }
146}
147
148impl From<fallback::TokenStream> for TokenStream {
149 fn from(inner: fallback::TokenStream) -> Self {
150 TokenStream::Fallback(inner)
151 }
152}
153
154// Assumes inside_proc_macro().
155fn into_compiler_token(token: TokenTree) -> proc_macro::TokenTree {
156 match token {
157 TokenTree::Group(tt: Group) => proc_macro::TokenTree::Group(tt.inner.unwrap_nightly()),
158 TokenTree::Punct(tt: Punct) => {
159 let spacing: Spacing = match tt.spacing() {
160 Spacing::Joint => proc_macro::Spacing::Joint,
161 Spacing::Alone => proc_macro::Spacing::Alone,
162 };
163 let mut punct: Punct = proc_macro::Punct::new(ch:tt.as_char(), spacing);
164 punct.set_span(tt.span().inner.unwrap_nightly());
165 proc_macro::TokenTree::Punct(punct)
166 }
167 TokenTree::Ident(tt: Ident) => proc_macro::TokenTree::Ident(tt.inner.unwrap_nightly()),
168 TokenTree::Literal(tt: Literal) => proc_macro::TokenTree::Literal(tt.inner.unwrap_nightly()),
169 }
170}
171
172impl From<TokenTree> for TokenStream {
173 fn from(token: TokenTree) -> Self {
174 if inside_proc_macro() {
175 TokenStream::Compiler(DeferredTokenStream::new(stream:proc_macro::TokenStream::from(
176 into_compiler_token(token),
177 )))
178 } else {
179 TokenStream::Fallback(fallback::TokenStream::from(token))
180 }
181 }
182}
183
184impl FromIterator<TokenTree> for TokenStream {
185 fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self {
186 if inside_proc_macro() {
187 TokenStream::Compiler(DeferredTokenStream::new(
188 stream:trees.into_iter().map(into_compiler_token).collect(),
189 ))
190 } else {
191 TokenStream::Fallback(trees.into_iter().collect())
192 }
193 }
194}
195
196impl FromIterator<TokenStream> for TokenStream {
197 fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
198 let mut streams: ::IntoIter = streams.into_iter();
199 match streams.next() {
200 Some(TokenStream::Compiler(mut first: DeferredTokenStream)) => {
201 first.evaluate_now();
202 first.stream.extend(iter:streams.map(|s: TokenStream| match s {
203 TokenStream::Compiler(s: DeferredTokenStream) => s.into_token_stream(),
204 TokenStream::Fallback(_) => mismatch(line!()),
205 }));
206 TokenStream::Compiler(first)
207 }
208 Some(TokenStream::Fallback(mut first: TokenStream)) => {
209 first.extend(iter:streams.map(|s: TokenStream| match s {
210 TokenStream::Fallback(s: TokenStream) => s,
211 TokenStream::Compiler(_) => mismatch(line!()),
212 }));
213 TokenStream::Fallback(first)
214 }
215 None => TokenStream::new(),
216 }
217 }
218}
219
220impl Extend<TokenTree> for TokenStream {
221 fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, stream: I) {
222 match self {
223 TokenStream::Compiler(tts: &mut DeferredTokenStream) => {
224 // Here is the reason for DeferredTokenStream.
225 for token: TokenTree in stream {
226 tts.extra.push(into_compiler_token(token));
227 }
228 }
229 TokenStream::Fallback(tts: &mut TokenStream) => tts.extend(iter:stream),
230 }
231 }
232}
233
234impl Extend<TokenStream> for TokenStream {
235 fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
236 match self {
237 TokenStream::Compiler(tts: &mut DeferredTokenStream) => {
238 tts.evaluate_now();
239 tts.stream
240 .extend(iter:streams.into_iter().map(TokenStream::unwrap_nightly));
241 }
242 TokenStream::Fallback(tts: &mut TokenStream) => {
243 tts.extend(iter:streams.into_iter().map(TokenStream::unwrap_stable));
244 }
245 }
246 }
247}
248
249impl Debug for TokenStream {
250 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
251 match self {
252 TokenStream::Compiler(tts: &DeferredTokenStream) => Debug::fmt(&tts.clone().into_token_stream(), f),
253 TokenStream::Fallback(tts: &TokenStream) => Debug::fmt(self:tts, f),
254 }
255 }
256}
257
258impl LexError {
259 pub(crate) fn span(&self) -> Span {
260 match self {
261 LexError::Compiler(_) | LexError::CompilerPanic => Span::call_site(),
262 LexError::Fallback(e: &LexError) => Span::Fallback(e.span()),
263 }
264 }
265}
266
267impl From<proc_macro::LexError> for LexError {
268 fn from(e: proc_macro::LexError) -> Self {
269 LexError::Compiler(e)
270 }
271}
272
273impl From<fallback::LexError> for LexError {
274 fn from(e: fallback::LexError) -> Self {
275 LexError::Fallback(e)
276 }
277}
278
279impl Debug for LexError {
280 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
281 match self {
282 LexError::Compiler(e: &LexError) => Debug::fmt(self:e, f),
283 LexError::Fallback(e: &LexError) => Debug::fmt(self:e, f),
284 LexError::CompilerPanic => {
285 let fallback: LexError = fallback::LexError::call_site();
286 Debug::fmt(&fallback, f)
287 }
288 }
289 }
290}
291
292impl Display for LexError {
293 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
294 match self {
295 LexError::Compiler(e: &LexError) => Display::fmt(self:e, f),
296 LexError::Fallback(e: &LexError) => Display::fmt(self:e, f),
297 LexError::CompilerPanic => {
298 let fallback: LexError = fallback::LexError::call_site();
299 Display::fmt(&fallback, f)
300 }
301 }
302 }
303}
304
305#[derive(Clone)]
306pub(crate) enum TokenTreeIter {
307 Compiler(proc_macro::token_stream::IntoIter),
308 Fallback(fallback::TokenTreeIter),
309}
310
311impl IntoIterator for TokenStream {
312 type Item = TokenTree;
313 type IntoIter = TokenTreeIter;
314
315 fn into_iter(self) -> TokenTreeIter {
316 match self {
317 TokenStream::Compiler(tts: DeferredTokenStream) => {
318 TokenTreeIter::Compiler(tts.into_token_stream().into_iter())
319 }
320 TokenStream::Fallback(tts: TokenStream) => TokenTreeIter::Fallback(tts.into_iter()),
321 }
322 }
323}
324
325impl Iterator for TokenTreeIter {
326 type Item = TokenTree;
327
328 fn next(&mut self) -> Option<TokenTree> {
329 let token = match self {
330 TokenTreeIter::Compiler(iter) => iter.next()?,
331 TokenTreeIter::Fallback(iter) => return iter.next(),
332 };
333 Some(match token {
334 proc_macro::TokenTree::Group(tt) => {
335 TokenTree::Group(crate::Group::_new(Group::Compiler(tt)))
336 }
337 proc_macro::TokenTree::Punct(tt) => {
338 let spacing = match tt.spacing() {
339 proc_macro::Spacing::Joint => Spacing::Joint,
340 proc_macro::Spacing::Alone => Spacing::Alone,
341 };
342 let mut o = Punct::new(tt.as_char(), spacing);
343 o.set_span(crate::Span::_new(Span::Compiler(tt.span())));
344 TokenTree::Punct(o)
345 }
346 proc_macro::TokenTree::Ident(s) => {
347 TokenTree::Ident(crate::Ident::_new(Ident::Compiler(s)))
348 }
349 proc_macro::TokenTree::Literal(l) => {
350 TokenTree::Literal(crate::Literal::_new(Literal::Compiler(l)))
351 }
352 })
353 }
354
355 fn size_hint(&self) -> (usize, Option<usize>) {
356 match self {
357 TokenTreeIter::Compiler(tts) => tts.size_hint(),
358 TokenTreeIter::Fallback(tts) => tts.size_hint(),
359 }
360 }
361}
362
363#[derive(Clone, PartialEq, Eq)]
364#[cfg(super_unstable)]
365pub(crate) enum SourceFile {
366 Compiler(proc_macro::SourceFile),
367 Fallback(fallback::SourceFile),
368}
369
370#[cfg(super_unstable)]
371impl SourceFile {
372 fn nightly(sf: proc_macro::SourceFile) -> Self {
373 SourceFile::Compiler(sf)
374 }
375
376 /// Get the path to this source file as a string.
377 pub(crate) fn path(&self) -> PathBuf {
378 match self {
379 SourceFile::Compiler(a) => a.path(),
380 SourceFile::Fallback(a) => a.path(),
381 }
382 }
383
384 pub(crate) fn is_real(&self) -> bool {
385 match self {
386 SourceFile::Compiler(a) => a.is_real(),
387 SourceFile::Fallback(a) => a.is_real(),
388 }
389 }
390}
391
392#[cfg(super_unstable)]
393impl Debug for SourceFile {
394 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
395 match self {
396 SourceFile::Compiler(a) => Debug::fmt(a, f),
397 SourceFile::Fallback(a) => Debug::fmt(a, f),
398 }
399 }
400}
401
402#[derive(Copy, Clone)]
403pub(crate) enum Span {
404 Compiler(proc_macro::Span),
405 Fallback(fallback::Span),
406}
407
408impl Span {
409 pub(crate) fn call_site() -> Self {
410 if inside_proc_macro() {
411 Span::Compiler(proc_macro::Span::call_site())
412 } else {
413 Span::Fallback(fallback::Span::call_site())
414 }
415 }
416
417 pub(crate) fn mixed_site() -> Self {
418 if inside_proc_macro() {
419 Span::Compiler(proc_macro::Span::mixed_site())
420 } else {
421 Span::Fallback(fallback::Span::mixed_site())
422 }
423 }
424
425 #[cfg(super_unstable)]
426 pub(crate) fn def_site() -> Self {
427 if inside_proc_macro() {
428 Span::Compiler(proc_macro::Span::def_site())
429 } else {
430 Span::Fallback(fallback::Span::def_site())
431 }
432 }
433
434 pub(crate) fn resolved_at(&self, other: Span) -> Span {
435 match (self, other) {
436 (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.resolved_at(b)),
437 (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.resolved_at(b)),
438 (Span::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
439 (Span::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
440 }
441 }
442
443 pub(crate) fn located_at(&self, other: Span) -> Span {
444 match (self, other) {
445 (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.located_at(b)),
446 (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.located_at(b)),
447 (Span::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
448 (Span::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
449 }
450 }
451
452 pub(crate) fn unwrap(self) -> proc_macro::Span {
453 match self {
454 Span::Compiler(s) => s,
455 Span::Fallback(_) => panic!("proc_macro::Span is only available in procedural macros"),
456 }
457 }
458
459 #[cfg(super_unstable)]
460 pub(crate) fn source_file(&self) -> SourceFile {
461 match self {
462 Span::Compiler(s) => SourceFile::nightly(s.source_file()),
463 Span::Fallback(s) => SourceFile::Fallback(s.source_file()),
464 }
465 }
466
467 #[cfg(span_locations)]
468 pub(crate) fn byte_range(&self) -> Range<usize> {
469 match self {
470 #[cfg(proc_macro_span)]
471 Span::Compiler(s) => s.byte_range(),
472 #[cfg(not(proc_macro_span))]
473 Span::Compiler(_) => 0..0,
474 Span::Fallback(s) => s.byte_range(),
475 }
476 }
477
478 #[cfg(span_locations)]
479 pub(crate) fn start(&self) -> LineColumn {
480 match self {
481 #[cfg(proc_macro_span)]
482 Span::Compiler(s) => LineColumn {
483 line: s.line(),
484 column: s.column().saturating_sub(1),
485 },
486 #[cfg(not(proc_macro_span))]
487 Span::Compiler(_) => LineColumn { line: 0, column: 0 },
488 Span::Fallback(s) => s.start(),
489 }
490 }
491
492 #[cfg(span_locations)]
493 pub(crate) fn end(&self) -> LineColumn {
494 match self {
495 #[cfg(proc_macro_span)]
496 Span::Compiler(s) => {
497 let end = s.end();
498 LineColumn {
499 line: end.line(),
500 column: end.column().saturating_sub(1),
501 }
502 }
503 #[cfg(not(proc_macro_span))]
504 Span::Compiler(_) => LineColumn { line: 0, column: 0 },
505 Span::Fallback(s) => s.end(),
506 }
507 }
508
509 pub(crate) fn join(&self, other: Span) -> Option<Span> {
510 let ret = match (self, other) {
511 #[cfg(proc_macro_span)]
512 (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.join(b)?),
513 (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.join(b)?),
514 _ => return None,
515 };
516 Some(ret)
517 }
518
519 #[cfg(super_unstable)]
520 pub(crate) fn eq(&self, other: &Span) -> bool {
521 match (self, other) {
522 (Span::Compiler(a), Span::Compiler(b)) => a.eq(b),
523 (Span::Fallback(a), Span::Fallback(b)) => a.eq(b),
524 _ => false,
525 }
526 }
527
528 pub(crate) fn source_text(&self) -> Option<String> {
529 match self {
530 #[cfg(not(no_source_text))]
531 Span::Compiler(s) => s.source_text(),
532 #[cfg(no_source_text)]
533 Span::Compiler(_) => None,
534 Span::Fallback(s) => s.source_text(),
535 }
536 }
537
538 fn unwrap_nightly(self) -> proc_macro::Span {
539 match self {
540 Span::Compiler(s) => s,
541 Span::Fallback(_) => mismatch(line!()),
542 }
543 }
544}
545
546impl From<proc_macro::Span> for crate::Span {
547 fn from(proc_span: proc_macro::Span) -> Self {
548 crate::Span::_new(inner:Span::Compiler(proc_span))
549 }
550}
551
552impl From<fallback::Span> for Span {
553 fn from(inner: fallback::Span) -> Self {
554 Span::Fallback(inner)
555 }
556}
557
558impl Debug for Span {
559 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
560 match self {
561 Span::Compiler(s: &Span) => Debug::fmt(self:s, f),
562 Span::Fallback(s: &Span) => Debug::fmt(self:s, f),
563 }
564 }
565}
566
567pub(crate) fn debug_span_field_if_nontrivial(debug: &mut fmt::DebugStruct, span: Span) {
568 match span {
569 Span::Compiler(s: Span) => {
570 debug.field(name:"span", &s);
571 }
572 Span::Fallback(s: Span) => fallback::debug_span_field_if_nontrivial(debug, span:s),
573 }
574}
575
576#[derive(Clone)]
577pub(crate) enum Group {
578 Compiler(proc_macro::Group),
579 Fallback(fallback::Group),
580}
581
582impl Group {
583 pub(crate) fn new(delimiter: Delimiter, stream: TokenStream) -> Self {
584 match stream {
585 TokenStream::Compiler(tts) => {
586 let delimiter = match delimiter {
587 Delimiter::Parenthesis => proc_macro::Delimiter::Parenthesis,
588 Delimiter::Bracket => proc_macro::Delimiter::Bracket,
589 Delimiter::Brace => proc_macro::Delimiter::Brace,
590 Delimiter::None => proc_macro::Delimiter::None,
591 };
592 Group::Compiler(proc_macro::Group::new(delimiter, tts.into_token_stream()))
593 }
594 TokenStream::Fallback(stream) => {
595 Group::Fallback(fallback::Group::new(delimiter, stream))
596 }
597 }
598 }
599
600 pub(crate) fn delimiter(&self) -> Delimiter {
601 match self {
602 Group::Compiler(g) => match g.delimiter() {
603 proc_macro::Delimiter::Parenthesis => Delimiter::Parenthesis,
604 proc_macro::Delimiter::Bracket => Delimiter::Bracket,
605 proc_macro::Delimiter::Brace => Delimiter::Brace,
606 proc_macro::Delimiter::None => Delimiter::None,
607 },
608 Group::Fallback(g) => g.delimiter(),
609 }
610 }
611
612 pub(crate) fn stream(&self) -> TokenStream {
613 match self {
614 Group::Compiler(g) => TokenStream::Compiler(DeferredTokenStream::new(g.stream())),
615 Group::Fallback(g) => TokenStream::Fallback(g.stream()),
616 }
617 }
618
619 pub(crate) fn span(&self) -> Span {
620 match self {
621 Group::Compiler(g) => Span::Compiler(g.span()),
622 Group::Fallback(g) => Span::Fallback(g.span()),
623 }
624 }
625
626 pub(crate) fn span_open(&self) -> Span {
627 match self {
628 Group::Compiler(g) => Span::Compiler(g.span_open()),
629 Group::Fallback(g) => Span::Fallback(g.span_open()),
630 }
631 }
632
633 pub(crate) fn span_close(&self) -> Span {
634 match self {
635 Group::Compiler(g) => Span::Compiler(g.span_close()),
636 Group::Fallback(g) => Span::Fallback(g.span_close()),
637 }
638 }
639
640 pub(crate) fn set_span(&mut self, span: Span) {
641 match (self, span) {
642 (Group::Compiler(g), Span::Compiler(s)) => g.set_span(s),
643 (Group::Fallback(g), Span::Fallback(s)) => g.set_span(s),
644 (Group::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
645 (Group::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
646 }
647 }
648
649 fn unwrap_nightly(self) -> proc_macro::Group {
650 match self {
651 Group::Compiler(g) => g,
652 Group::Fallback(_) => mismatch(line!()),
653 }
654 }
655}
656
657impl From<fallback::Group> for Group {
658 fn from(g: fallback::Group) -> Self {
659 Group::Fallback(g)
660 }
661}
662
663impl Display for Group {
664 fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
665 match self {
666 Group::Compiler(group: &Group) => Display::fmt(self:group, f:formatter),
667 Group::Fallback(group: &Group) => Display::fmt(self:group, f:formatter),
668 }
669 }
670}
671
672impl Debug for Group {
673 fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
674 match self {
675 Group::Compiler(group: &Group) => Debug::fmt(self:group, f:formatter),
676 Group::Fallback(group: &Group) => Debug::fmt(self:group, f:formatter),
677 }
678 }
679}
680
681#[derive(Clone)]
682pub(crate) enum Ident {
683 Compiler(proc_macro::Ident),
684 Fallback(fallback::Ident),
685}
686
687impl Ident {
688 #[track_caller]
689 pub(crate) fn new_checked(string: &str, span: Span) -> Self {
690 match span {
691 Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new(string, s)),
692 Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_checked(string, s)),
693 }
694 }
695
696 #[track_caller]
697 pub(crate) fn new_raw_checked(string: &str, span: Span) -> Self {
698 match span {
699 Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new_raw(string, s)),
700 Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_raw_checked(string, s)),
701 }
702 }
703
704 pub(crate) fn span(&self) -> Span {
705 match self {
706 Ident::Compiler(t) => Span::Compiler(t.span()),
707 Ident::Fallback(t) => Span::Fallback(t.span()),
708 }
709 }
710
711 pub(crate) fn set_span(&mut self, span: Span) {
712 match (self, span) {
713 (Ident::Compiler(t), Span::Compiler(s)) => t.set_span(s),
714 (Ident::Fallback(t), Span::Fallback(s)) => t.set_span(s),
715 (Ident::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
716 (Ident::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
717 }
718 }
719
720 fn unwrap_nightly(self) -> proc_macro::Ident {
721 match self {
722 Ident::Compiler(s) => s,
723 Ident::Fallback(_) => mismatch(line!()),
724 }
725 }
726}
727
728impl From<fallback::Ident> for Ident {
729 fn from(inner: fallback::Ident) -> Self {
730 Ident::Fallback(inner)
731 }
732}
733
734impl PartialEq for Ident {
735 fn eq(&self, other: &Ident) -> bool {
736 match (self, other) {
737 (Ident::Compiler(t: &Ident), Ident::Compiler(o: &Ident)) => t.to_string() == o.to_string(),
738 (Ident::Fallback(t: &Ident), Ident::Fallback(o: &Ident)) => t == o,
739 (Ident::Compiler(_), Ident::Fallback(_)) => mismatch(line!()),
740 (Ident::Fallback(_), Ident::Compiler(_)) => mismatch(line!()),
741 }
742 }
743}
744
745impl<T> PartialEq<T> for Ident
746where
747 T: ?Sized + AsRef<str>,
748{
749 fn eq(&self, other: &T) -> bool {
750 let other: &str = other.as_ref();
751 match self {
752 Ident::Compiler(t: &Ident) => t.to_string() == other,
753 Ident::Fallback(t: &Ident) => t == other,
754 }
755 }
756}
757
758impl Display for Ident {
759 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
760 match self {
761 Ident::Compiler(t: &Ident) => Display::fmt(self:t, f),
762 Ident::Fallback(t: &Ident) => Display::fmt(self:t, f),
763 }
764 }
765}
766
767impl Debug for Ident {
768 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
769 match self {
770 Ident::Compiler(t: &Ident) => Debug::fmt(self:t, f),
771 Ident::Fallback(t: &Ident) => Debug::fmt(self:t, f),
772 }
773 }
774}
775
776#[derive(Clone)]
777pub(crate) enum Literal {
778 Compiler(proc_macro::Literal),
779 Fallback(fallback::Literal),
780}
781
782macro_rules! suffixed_numbers {
783 ($($name:ident => $kind:ident,)*) => ($(
784 pub(crate) fn $name(n: $kind) -> Literal {
785 if inside_proc_macro() {
786 Literal::Compiler(proc_macro::Literal::$name(n))
787 } else {
788 Literal::Fallback(fallback::Literal::$name(n))
789 }
790 }
791 )*)
792}
793
794macro_rules! unsuffixed_integers {
795 ($($name:ident => $kind:ident,)*) => ($(
796 pub(crate) fn $name(n: $kind) -> Literal {
797 if inside_proc_macro() {
798 Literal::Compiler(proc_macro::Literal::$name(n))
799 } else {
800 Literal::Fallback(fallback::Literal::$name(n))
801 }
802 }
803 )*)
804}
805
806impl Literal {
807 pub(crate) fn from_str_checked(repr: &str) -> Result<Self, LexError> {
808 if inside_proc_macro() {
809 let literal = proc_macro::Literal::from_str_checked(repr)?;
810 Ok(Literal::Compiler(literal))
811 } else {
812 let literal = fallback::Literal::from_str_checked(repr)?;
813 Ok(Literal::Fallback(literal))
814 }
815 }
816
817 pub(crate) unsafe fn from_str_unchecked(repr: &str) -> Self {
818 if inside_proc_macro() {
819 Literal::Compiler(proc_macro::Literal::from_str_unchecked(repr))
820 } else {
821 Literal::Fallback(unsafe { fallback::Literal::from_str_unchecked(repr) })
822 }
823 }
824
825 suffixed_numbers! {
826 u8_suffixed => u8,
827 u16_suffixed => u16,
828 u32_suffixed => u32,
829 u64_suffixed => u64,
830 u128_suffixed => u128,
831 usize_suffixed => usize,
832 i8_suffixed => i8,
833 i16_suffixed => i16,
834 i32_suffixed => i32,
835 i64_suffixed => i64,
836 i128_suffixed => i128,
837 isize_suffixed => isize,
838
839 f32_suffixed => f32,
840 f64_suffixed => f64,
841 }
842
843 unsuffixed_integers! {
844 u8_unsuffixed => u8,
845 u16_unsuffixed => u16,
846 u32_unsuffixed => u32,
847 u64_unsuffixed => u64,
848 u128_unsuffixed => u128,
849 usize_unsuffixed => usize,
850 i8_unsuffixed => i8,
851 i16_unsuffixed => i16,
852 i32_unsuffixed => i32,
853 i64_unsuffixed => i64,
854 i128_unsuffixed => i128,
855 isize_unsuffixed => isize,
856 }
857
858 pub(crate) fn f32_unsuffixed(f: f32) -> Literal {
859 if inside_proc_macro() {
860 Literal::Compiler(proc_macro::Literal::f32_unsuffixed(f))
861 } else {
862 Literal::Fallback(fallback::Literal::f32_unsuffixed(f))
863 }
864 }
865
866 pub(crate) fn f64_unsuffixed(f: f64) -> Literal {
867 if inside_proc_macro() {
868 Literal::Compiler(proc_macro::Literal::f64_unsuffixed(f))
869 } else {
870 Literal::Fallback(fallback::Literal::f64_unsuffixed(f))
871 }
872 }
873
874 pub(crate) fn string(string: &str) -> Literal {
875 if inside_proc_macro() {
876 Literal::Compiler(proc_macro::Literal::string(string))
877 } else {
878 Literal::Fallback(fallback::Literal::string(string))
879 }
880 }
881
882 pub(crate) fn character(ch: char) -> Literal {
883 if inside_proc_macro() {
884 Literal::Compiler(proc_macro::Literal::character(ch))
885 } else {
886 Literal::Fallback(fallback::Literal::character(ch))
887 }
888 }
889
890 pub(crate) fn byte_character(byte: u8) -> Literal {
891 if inside_proc_macro() {
892 Literal::Compiler({
893 #[cfg(not(no_literal_byte_character))]
894 {
895 proc_macro::Literal::byte_character(byte)
896 }
897
898 #[cfg(no_literal_byte_character)]
899 {
900 let fallback = fallback::Literal::byte_character(byte);
901 proc_macro::Literal::from_str_unchecked(&fallback.repr)
902 }
903 })
904 } else {
905 Literal::Fallback(fallback::Literal::byte_character(byte))
906 }
907 }
908
909 pub(crate) fn byte_string(bytes: &[u8]) -> Literal {
910 if inside_proc_macro() {
911 Literal::Compiler(proc_macro::Literal::byte_string(bytes))
912 } else {
913 Literal::Fallback(fallback::Literal::byte_string(bytes))
914 }
915 }
916
917 pub(crate) fn c_string(string: &CStr) -> Literal {
918 if inside_proc_macro() {
919 Literal::Compiler({
920 #[cfg(not(no_literal_c_string))]
921 {
922 proc_macro::Literal::c_string(string)
923 }
924
925 #[cfg(no_literal_c_string)]
926 {
927 let fallback = fallback::Literal::c_string(string);
928 proc_macro::Literal::from_str_unchecked(&fallback.repr)
929 }
930 })
931 } else {
932 Literal::Fallback(fallback::Literal::c_string(string))
933 }
934 }
935
936 pub(crate) fn span(&self) -> Span {
937 match self {
938 Literal::Compiler(lit) => Span::Compiler(lit.span()),
939 Literal::Fallback(lit) => Span::Fallback(lit.span()),
940 }
941 }
942
943 pub(crate) fn set_span(&mut self, span: Span) {
944 match (self, span) {
945 (Literal::Compiler(lit), Span::Compiler(s)) => lit.set_span(s),
946 (Literal::Fallback(lit), Span::Fallback(s)) => lit.set_span(s),
947 (Literal::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
948 (Literal::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
949 }
950 }
951
952 pub(crate) fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> {
953 match self {
954 #[cfg(proc_macro_span)]
955 Literal::Compiler(lit) => lit.subspan(range).map(Span::Compiler),
956 #[cfg(not(proc_macro_span))]
957 Literal::Compiler(_lit) => None,
958 Literal::Fallback(lit) => lit.subspan(range).map(Span::Fallback),
959 }
960 }
961
962 fn unwrap_nightly(self) -> proc_macro::Literal {
963 match self {
964 Literal::Compiler(s) => s,
965 Literal::Fallback(_) => mismatch(line!()),
966 }
967 }
968}
969
970impl From<fallback::Literal> for Literal {
971 fn from(s: fallback::Literal) -> Self {
972 Literal::Fallback(s)
973 }
974}
975
976impl Display for Literal {
977 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
978 match self {
979 Literal::Compiler(t: &Literal) => Display::fmt(self:t, f),
980 Literal::Fallback(t: &Literal) => Display::fmt(self:t, f),
981 }
982 }
983}
984
985impl Debug for Literal {
986 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
987 match self {
988 Literal::Compiler(t: &Literal) => Debug::fmt(self:t, f),
989 Literal::Fallback(t: &Literal) => Debug::fmt(self:t, f),
990 }
991 }
992}
993
994#[cfg(span_locations)]
995pub(crate) fn invalidate_current_thread_spans() {
996 if inside_proc_macro() {
997 panic!(
998 "proc_macro2::extra::invalidate_current_thread_spans is not available in procedural macros"
999 );
1000 } else {
1001 crate::fallback::invalidate_current_thread_spans();
1002 }
1003}
1004