| use crate::detection::inside_proc_macro; |
| #[cfg(span_locations)] |
| use crate::location::LineColumn; |
| use crate::{fallback, Delimiter, Punct, Spacing, TokenTree}; |
| use core::fmt::{self, Debug, Display}; |
| use core::ops::RangeBounds; |
| use core::str::FromStr; |
| use std::panic; |
| #[cfg(super_unstable)] |
| use std::path::PathBuf; |
| |
| #[derive(Clone)] |
| pub(crate) enum TokenStream { |
| Compiler(DeferredTokenStream), |
| Fallback(fallback::TokenStream), |
| } |
| |
| // Work around https://github.com/rust-lang/rust/issues/65080. |
| // In `impl Extend<TokenTree> for TokenStream` which is used heavily by quote, |
| // we hold on to the appended tokens and do proc_macro::TokenStream::extend as |
| // late as possible to batch together consecutive uses of the Extend impl. |
| #[derive(Clone)] |
| pub(crate) struct DeferredTokenStream { |
| stream: proc_macro::TokenStream, |
| extra: Vec<proc_macro::TokenTree>, |
| } |
| |
| pub(crate) enum LexError { |
| Compiler(proc_macro::LexError), |
| Fallback(fallback::LexError), |
| } |
| |
| impl LexError { |
| fn call_site() -> Self { |
| LexError::Fallback(fallback::LexError { |
| span: fallback::Span::call_site(), |
| }) |
| } |
| } |
| |
| fn mismatch() -> ! { |
| panic!("compiler/fallback mismatch") |
| } |
| |
| impl DeferredTokenStream { |
| fn new(stream: proc_macro::TokenStream) -> Self { |
| DeferredTokenStream { |
| stream, |
| extra: Vec::new(), |
| } |
| } |
| |
| fn is_empty(&self) -> bool { |
| self.stream.is_empty() && self.extra.is_empty() |
| } |
| |
| fn evaluate_now(&mut self) { |
| // If-check provides a fast short circuit for the common case of `extra` |
| // being empty, which saves a round trip over the proc macro bridge. |
| // Improves macro expansion time in winrt by 6% in debug mode. |
| if !self.extra.is_empty() { |
| self.stream.extend(self.extra.drain(..)); |
| } |
| } |
| |
| fn into_token_stream(mut self) -> proc_macro::TokenStream { |
| self.evaluate_now(); |
| self.stream |
| } |
| } |
| |
| impl TokenStream { |
| pub fn new() -> Self { |
| if inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new(proc_macro::TokenStream::new())) |
| } else { |
| TokenStream::Fallback(fallback::TokenStream::new()) |
| } |
| } |
| |
| pub fn is_empty(&self) -> bool { |
| match self { |
| TokenStream::Compiler(tts) => tts.is_empty(), |
| TokenStream::Fallback(tts) => tts.is_empty(), |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::TokenStream { |
| match self { |
| TokenStream::Compiler(s) => s.into_token_stream(), |
| TokenStream::Fallback(_) => mismatch(), |
| } |
| } |
| |
| fn unwrap_stable(self) -> fallback::TokenStream { |
| match self { |
| TokenStream::Compiler(_) => mismatch(), |
| TokenStream::Fallback(s) => s, |
| } |
| } |
| } |
| |
| impl FromStr for TokenStream { |
| type Err = LexError; |
| |
| fn from_str(src: &str) -> Result<TokenStream, LexError> { |
| if inside_proc_macro() { |
| Ok(TokenStream::Compiler(DeferredTokenStream::new( |
| proc_macro_parse(src)?, |
| ))) |
| } else { |
| Ok(TokenStream::Fallback(src.parse()?)) |
| } |
| } |
| } |
| |
| // Work around https://github.com/rust-lang/rust/issues/58736. |
| fn proc_macro_parse(src: &str) -> Result<proc_macro::TokenStream, LexError> { |
| let result = panic::catch_unwind(|| src.parse().map_err(LexError::Compiler)); |
| result.unwrap_or_else(|_| Err(LexError::call_site())) |
| } |
| |
| impl Display for TokenStream { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| TokenStream::Compiler(tts) => Display::fmt(&tts.clone().into_token_stream(), f), |
| TokenStream::Fallback(tts) => Display::fmt(tts, f), |
| } |
| } |
| } |
| |
| impl From<proc_macro::TokenStream> for TokenStream { |
| fn from(inner: proc_macro::TokenStream) -> Self { |
| TokenStream::Compiler(DeferredTokenStream::new(inner)) |
| } |
| } |
| |
| impl From<TokenStream> for proc_macro::TokenStream { |
| fn from(inner: TokenStream) -> Self { |
| match inner { |
| TokenStream::Compiler(inner) => inner.into_token_stream(), |
| TokenStream::Fallback(inner) => inner.to_string().parse().unwrap(), |
| } |
| } |
| } |
| |
| impl From<fallback::TokenStream> for TokenStream { |
| fn from(inner: fallback::TokenStream) -> Self { |
| TokenStream::Fallback(inner) |
| } |
| } |
| |
| // Assumes inside_proc_macro(). |
| fn into_compiler_token(token: TokenTree) -> proc_macro::TokenTree { |
| match token { |
| TokenTree::Group(tt) => tt.inner.unwrap_nightly().into(), |
| TokenTree::Punct(tt) => { |
| let spacing = match tt.spacing() { |
| Spacing::Joint => proc_macro::Spacing::Joint, |
| Spacing::Alone => proc_macro::Spacing::Alone, |
| }; |
| let mut punct = proc_macro::Punct::new(tt.as_char(), spacing); |
| punct.set_span(tt.span().inner.unwrap_nightly()); |
| punct.into() |
| } |
| TokenTree::Ident(tt) => tt.inner.unwrap_nightly().into(), |
| TokenTree::Literal(tt) => tt.inner.unwrap_nightly().into(), |
| } |
| } |
| |
| impl From<TokenTree> for TokenStream { |
| fn from(token: TokenTree) -> Self { |
| if inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new(into_compiler_token(token).into())) |
| } else { |
| TokenStream::Fallback(token.into()) |
| } |
| } |
| } |
| |
| impl FromIterator<TokenTree> for TokenStream { |
| fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self { |
| if inside_proc_macro() { |
| TokenStream::Compiler(DeferredTokenStream::new( |
| trees.into_iter().map(into_compiler_token).collect(), |
| )) |
| } else { |
| TokenStream::Fallback(trees.into_iter().collect()) |
| } |
| } |
| } |
| |
| impl FromIterator<TokenStream> for TokenStream { |
| fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self { |
| let mut streams = streams.into_iter(); |
| match streams.next() { |
| Some(TokenStream::Compiler(mut first)) => { |
| first.evaluate_now(); |
| first.stream.extend(streams.map(|s| match s { |
| TokenStream::Compiler(s) => s.into_token_stream(), |
| TokenStream::Fallback(_) => mismatch(), |
| })); |
| TokenStream::Compiler(first) |
| } |
| Some(TokenStream::Fallback(mut first)) => { |
| first.extend(streams.map(|s| match s { |
| TokenStream::Fallback(s) => s, |
| TokenStream::Compiler(_) => mismatch(), |
| })); |
| TokenStream::Fallback(first) |
| } |
| None => TokenStream::new(), |
| } |
| } |
| } |
| |
| impl Extend<TokenTree> for TokenStream { |
| fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, stream: I) { |
| match self { |
| TokenStream::Compiler(tts) => { |
| // Here is the reason for DeferredTokenStream. |
| for token in stream { |
| tts.extra.push(into_compiler_token(token)); |
| } |
| } |
| TokenStream::Fallback(tts) => tts.extend(stream), |
| } |
| } |
| } |
| |
| impl Extend<TokenStream> for TokenStream { |
| fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) { |
| match self { |
| TokenStream::Compiler(tts) => { |
| tts.evaluate_now(); |
| tts.stream |
| .extend(streams.into_iter().map(TokenStream::unwrap_nightly)); |
| } |
| TokenStream::Fallback(tts) => { |
| tts.extend(streams.into_iter().map(TokenStream::unwrap_stable)); |
| } |
| } |
| } |
| } |
| |
| impl Debug for TokenStream { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| TokenStream::Compiler(tts) => Debug::fmt(&tts.clone().into_token_stream(), f), |
| TokenStream::Fallback(tts) => Debug::fmt(tts, f), |
| } |
| } |
| } |
| |
| impl LexError { |
| pub(crate) fn span(&self) -> Span { |
| match self { |
| LexError::Compiler(_) => Span::call_site(), |
| LexError::Fallback(e) => Span::Fallback(e.span()), |
| } |
| } |
| } |
| |
| impl From<proc_macro::LexError> for LexError { |
| fn from(e: proc_macro::LexError) -> Self { |
| LexError::Compiler(e) |
| } |
| } |
| |
| impl From<fallback::LexError> for LexError { |
| fn from(e: fallback::LexError) -> Self { |
| LexError::Fallback(e) |
| } |
| } |
| |
| impl Debug for LexError { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| LexError::Compiler(e) => Debug::fmt(e, f), |
| LexError::Fallback(e) => Debug::fmt(e, f), |
| } |
| } |
| } |
| |
| impl Display for LexError { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| LexError::Compiler(e) => Display::fmt(e, f), |
| LexError::Fallback(e) => Display::fmt(e, f), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub(crate) enum TokenTreeIter { |
| Compiler(proc_macro::token_stream::IntoIter), |
| Fallback(fallback::TokenTreeIter), |
| } |
| |
| impl IntoIterator for TokenStream { |
| type Item = TokenTree; |
| type IntoIter = TokenTreeIter; |
| |
| fn into_iter(self) -> TokenTreeIter { |
| match self { |
| TokenStream::Compiler(tts) => { |
| TokenTreeIter::Compiler(tts.into_token_stream().into_iter()) |
| } |
| TokenStream::Fallback(tts) => TokenTreeIter::Fallback(tts.into_iter()), |
| } |
| } |
| } |
| |
| impl Iterator for TokenTreeIter { |
| type Item = TokenTree; |
| |
| fn next(&mut self) -> Option<TokenTree> { |
| let token = match self { |
| TokenTreeIter::Compiler(iter) => iter.next()?, |
| TokenTreeIter::Fallback(iter) => return iter.next(), |
| }; |
| Some(match token { |
| proc_macro::TokenTree::Group(tt) => crate::Group::_new(Group::Compiler(tt)).into(), |
| proc_macro::TokenTree::Punct(tt) => { |
| let spacing = match tt.spacing() { |
| proc_macro::Spacing::Joint => Spacing::Joint, |
| proc_macro::Spacing::Alone => Spacing::Alone, |
| }; |
| let mut o = Punct::new(tt.as_char(), spacing); |
| o.set_span(crate::Span::_new(Span::Compiler(tt.span()))); |
| o.into() |
| } |
| proc_macro::TokenTree::Ident(s) => crate::Ident::_new(Ident::Compiler(s)).into(), |
| proc_macro::TokenTree::Literal(l) => crate::Literal::_new(Literal::Compiler(l)).into(), |
| }) |
| } |
| |
| fn size_hint(&self) -> (usize, Option<usize>) { |
| match self { |
| TokenTreeIter::Compiler(tts) => tts.size_hint(), |
| TokenTreeIter::Fallback(tts) => tts.size_hint(), |
| } |
| } |
| } |
| |
| #[derive(Clone, PartialEq, Eq)] |
| #[cfg(super_unstable)] |
| pub(crate) enum SourceFile { |
| Compiler(proc_macro::SourceFile), |
| Fallback(fallback::SourceFile), |
| } |
| |
| #[cfg(super_unstable)] |
| impl SourceFile { |
| fn nightly(sf: proc_macro::SourceFile) -> Self { |
| SourceFile::Compiler(sf) |
| } |
| |
| /// Get the path to this source file as a string. |
| pub fn path(&self) -> PathBuf { |
| match self { |
| SourceFile::Compiler(a) => a.path(), |
| SourceFile::Fallback(a) => a.path(), |
| } |
| } |
| |
| pub fn is_real(&self) -> bool { |
| match self { |
| SourceFile::Compiler(a) => a.is_real(), |
| SourceFile::Fallback(a) => a.is_real(), |
| } |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| impl Debug for SourceFile { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| SourceFile::Compiler(a) => Debug::fmt(a, f), |
| SourceFile::Fallback(a) => Debug::fmt(a, f), |
| } |
| } |
| } |
| |
| #[derive(Copy, Clone)] |
| pub(crate) enum Span { |
| Compiler(proc_macro::Span), |
| Fallback(fallback::Span), |
| } |
| |
| impl Span { |
| pub fn call_site() -> Self { |
| if inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::call_site()) |
| } else { |
| Span::Fallback(fallback::Span::call_site()) |
| } |
| } |
| |
| pub fn mixed_site() -> Self { |
| if inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::mixed_site()) |
| } else { |
| Span::Fallback(fallback::Span::mixed_site()) |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn def_site() -> Self { |
| if inside_proc_macro() { |
| Span::Compiler(proc_macro::Span::def_site()) |
| } else { |
| Span::Fallback(fallback::Span::def_site()) |
| } |
| } |
| |
| pub fn resolved_at(&self, other: Span) -> Span { |
| match (self, other) { |
| (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.resolved_at(b)), |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.resolved_at(b)), |
| _ => mismatch(), |
| } |
| } |
| |
| pub fn located_at(&self, other: Span) -> Span { |
| match (self, other) { |
| (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.located_at(b)), |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.located_at(b)), |
| _ => mismatch(), |
| } |
| } |
| |
| pub fn unwrap(self) -> proc_macro::Span { |
| match self { |
| Span::Compiler(s) => s, |
| Span::Fallback(_) => panic!("proc_macro::Span is only available in procedural macros"), |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn source_file(&self) -> SourceFile { |
| match self { |
| Span::Compiler(s) => SourceFile::nightly(s.source_file()), |
| Span::Fallback(s) => SourceFile::Fallback(s.source_file()), |
| } |
| } |
| |
| #[cfg(span_locations)] |
| pub fn start(&self) -> LineColumn { |
| match self { |
| Span::Compiler(_) => LineColumn { line: 0, column: 0 }, |
| Span::Fallback(s) => s.start(), |
| } |
| } |
| |
| #[cfg(span_locations)] |
| pub fn end(&self) -> LineColumn { |
| match self { |
| Span::Compiler(_) => LineColumn { line: 0, column: 0 }, |
| Span::Fallback(s) => s.end(), |
| } |
| } |
| |
| pub fn join(&self, other: Span) -> Option<Span> { |
| let ret = match (self, other) { |
| #[cfg(proc_macro_span)] |
| (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.join(b)?), |
| (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.join(b)?), |
| _ => return None, |
| }; |
| Some(ret) |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn eq(&self, other: &Span) -> bool { |
| match (self, other) { |
| (Span::Compiler(a), Span::Compiler(b)) => a.eq(b), |
| (Span::Fallback(a), Span::Fallback(b)) => a.eq(b), |
| _ => false, |
| } |
| } |
| |
| pub fn source_text(&self) -> Option<String> { |
| match self { |
| #[cfg(not(no_source_text))] |
| Span::Compiler(s) => s.source_text(), |
| #[cfg(no_source_text)] |
| Span::Compiler(_) => None, |
| Span::Fallback(s) => s.source_text(), |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::Span { |
| match self { |
| Span::Compiler(s) => s, |
| Span::Fallback(_) => mismatch(), |
| } |
| } |
| } |
| |
| impl From<proc_macro::Span> for crate::Span { |
| fn from(proc_span: proc_macro::Span) -> Self { |
| crate::Span::_new(Span::Compiler(proc_span)) |
| } |
| } |
| |
| impl From<fallback::Span> for Span { |
| fn from(inner: fallback::Span) -> Self { |
| Span::Fallback(inner) |
| } |
| } |
| |
| impl Debug for Span { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Span::Compiler(s) => Debug::fmt(s, f), |
| Span::Fallback(s) => Debug::fmt(s, f), |
| } |
| } |
| } |
| |
| pub(crate) fn debug_span_field_if_nontrivial(debug: &mut fmt::DebugStruct, span: Span) { |
| match span { |
| Span::Compiler(s) => { |
| debug.field("span", &s); |
| } |
| Span::Fallback(s) => fallback::debug_span_field_if_nontrivial(debug, s), |
| } |
| } |
| |
| #[derive(Clone)] |
| pub(crate) enum Group { |
| Compiler(proc_macro::Group), |
| Fallback(fallback::Group), |
| } |
| |
| impl Group { |
| pub fn new(delimiter: Delimiter, stream: TokenStream) -> Self { |
| match stream { |
| TokenStream::Compiler(tts) => { |
| let delimiter = match delimiter { |
| Delimiter::Parenthesis => proc_macro::Delimiter::Parenthesis, |
| Delimiter::Bracket => proc_macro::Delimiter::Bracket, |
| Delimiter::Brace => proc_macro::Delimiter::Brace, |
| Delimiter::None => proc_macro::Delimiter::None, |
| }; |
| Group::Compiler(proc_macro::Group::new(delimiter, tts.into_token_stream())) |
| } |
| TokenStream::Fallback(stream) => { |
| Group::Fallback(fallback::Group::new(delimiter, stream)) |
| } |
| } |
| } |
| |
| pub fn delimiter(&self) -> Delimiter { |
| match self { |
| Group::Compiler(g) => match g.delimiter() { |
| proc_macro::Delimiter::Parenthesis => Delimiter::Parenthesis, |
| proc_macro::Delimiter::Bracket => Delimiter::Bracket, |
| proc_macro::Delimiter::Brace => Delimiter::Brace, |
| proc_macro::Delimiter::None => Delimiter::None, |
| }, |
| Group::Fallback(g) => g.delimiter(), |
| } |
| } |
| |
| pub fn stream(&self) -> TokenStream { |
| match self { |
| Group::Compiler(g) => TokenStream::Compiler(DeferredTokenStream::new(g.stream())), |
| Group::Fallback(g) => TokenStream::Fallback(g.stream()), |
| } |
| } |
| |
| pub fn span(&self) -> Span { |
| match self { |
| Group::Compiler(g) => Span::Compiler(g.span()), |
| Group::Fallback(g) => Span::Fallback(g.span()), |
| } |
| } |
| |
| pub fn span_open(&self) -> Span { |
| match self { |
| Group::Compiler(g) => Span::Compiler(g.span_open()), |
| Group::Fallback(g) => Span::Fallback(g.span_open()), |
| } |
| } |
| |
| pub fn span_close(&self) -> Span { |
| match self { |
| Group::Compiler(g) => Span::Compiler(g.span_close()), |
| Group::Fallback(g) => Span::Fallback(g.span_close()), |
| } |
| } |
| |
| pub fn set_span(&mut self, span: Span) { |
| match (self, span) { |
| (Group::Compiler(g), Span::Compiler(s)) => g.set_span(s), |
| (Group::Fallback(g), Span::Fallback(s)) => g.set_span(s), |
| _ => mismatch(), |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::Group { |
| match self { |
| Group::Compiler(g) => g, |
| Group::Fallback(_) => mismatch(), |
| } |
| } |
| } |
| |
| impl From<fallback::Group> for Group { |
| fn from(g: fallback::Group) -> Self { |
| Group::Fallback(g) |
| } |
| } |
| |
| impl Display for Group { |
| fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Group::Compiler(group) => Display::fmt(group, formatter), |
| Group::Fallback(group) => Display::fmt(group, formatter), |
| } |
| } |
| } |
| |
| impl Debug for Group { |
| fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Group::Compiler(group) => Debug::fmt(group, formatter), |
| Group::Fallback(group) => Debug::fmt(group, formatter), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub(crate) enum Ident { |
| Compiler(proc_macro::Ident), |
| Fallback(fallback::Ident), |
| } |
| |
| impl Ident { |
| pub fn new(string: &str, span: Span) -> Self { |
| match span { |
| Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new(string, s)), |
| Span::Fallback(s) => Ident::Fallback(fallback::Ident::new(string, s)), |
| } |
| } |
| |
| pub fn new_raw(string: &str, span: Span) -> Self { |
| match span { |
| Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new_raw(string, s)), |
| Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_raw(string, s)), |
| } |
| } |
| |
| pub fn span(&self) -> Span { |
| match self { |
| Ident::Compiler(t) => Span::Compiler(t.span()), |
| Ident::Fallback(t) => Span::Fallback(t.span()), |
| } |
| } |
| |
| pub fn set_span(&mut self, span: Span) { |
| match (self, span) { |
| (Ident::Compiler(t), Span::Compiler(s)) => t.set_span(s), |
| (Ident::Fallback(t), Span::Fallback(s)) => t.set_span(s), |
| _ => mismatch(), |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::Ident { |
| match self { |
| Ident::Compiler(s) => s, |
| Ident::Fallback(_) => mismatch(), |
| } |
| } |
| } |
| |
| impl PartialEq for Ident { |
| fn eq(&self, other: &Ident) -> bool { |
| match (self, other) { |
| (Ident::Compiler(t), Ident::Compiler(o)) => t.to_string() == o.to_string(), |
| (Ident::Fallback(t), Ident::Fallback(o)) => t == o, |
| _ => mismatch(), |
| } |
| } |
| } |
| |
| impl<T> PartialEq<T> for Ident |
| where |
| T: ?Sized + AsRef<str>, |
| { |
| fn eq(&self, other: &T) -> bool { |
| let other = other.as_ref(); |
| match self { |
| Ident::Compiler(t) => t.to_string() == other, |
| Ident::Fallback(t) => t == other, |
| } |
| } |
| } |
| |
| impl Display for Ident { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Ident::Compiler(t) => Display::fmt(t, f), |
| Ident::Fallback(t) => Display::fmt(t, f), |
| } |
| } |
| } |
| |
| impl Debug for Ident { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Ident::Compiler(t) => Debug::fmt(t, f), |
| Ident::Fallback(t) => Debug::fmt(t, f), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub(crate) enum Literal { |
| Compiler(proc_macro::Literal), |
| Fallback(fallback::Literal), |
| } |
| |
| macro_rules! suffixed_numbers { |
| ($($name:ident => $kind:ident,)*) => ($( |
| pub fn $name(n: $kind) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::$name(n)) |
| } else { |
| Literal::Fallback(fallback::Literal::$name(n)) |
| } |
| } |
| )*) |
| } |
| |
| macro_rules! unsuffixed_integers { |
| ($($name:ident => $kind:ident,)*) => ($( |
| pub fn $name(n: $kind) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::$name(n)) |
| } else { |
| Literal::Fallback(fallback::Literal::$name(n)) |
| } |
| } |
| )*) |
| } |
| |
| impl Literal { |
| pub unsafe fn from_str_unchecked(repr: &str) -> Self { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::from_str(repr).expect("invalid literal")) |
| } else { |
| Literal::Fallback(fallback::Literal::from_str_unchecked(repr)) |
| } |
| } |
| |
| suffixed_numbers! { |
| u8_suffixed => u8, |
| u16_suffixed => u16, |
| u32_suffixed => u32, |
| u64_suffixed => u64, |
| u128_suffixed => u128, |
| usize_suffixed => usize, |
| i8_suffixed => i8, |
| i16_suffixed => i16, |
| i32_suffixed => i32, |
| i64_suffixed => i64, |
| i128_suffixed => i128, |
| isize_suffixed => isize, |
| |
| f32_suffixed => f32, |
| f64_suffixed => f64, |
| } |
| |
| unsuffixed_integers! { |
| u8_unsuffixed => u8, |
| u16_unsuffixed => u16, |
| u32_unsuffixed => u32, |
| u64_unsuffixed => u64, |
| u128_unsuffixed => u128, |
| usize_unsuffixed => usize, |
| i8_unsuffixed => i8, |
| i16_unsuffixed => i16, |
| i32_unsuffixed => i32, |
| i64_unsuffixed => i64, |
| i128_unsuffixed => i128, |
| isize_unsuffixed => isize, |
| } |
| |
| pub fn f32_unsuffixed(f: f32) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::f32_unsuffixed(f)) |
| } else { |
| Literal::Fallback(fallback::Literal::f32_unsuffixed(f)) |
| } |
| } |
| |
| pub fn f64_unsuffixed(f: f64) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::f64_unsuffixed(f)) |
| } else { |
| Literal::Fallback(fallback::Literal::f64_unsuffixed(f)) |
| } |
| } |
| |
| pub fn string(t: &str) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::string(t)) |
| } else { |
| Literal::Fallback(fallback::Literal::string(t)) |
| } |
| } |
| |
| pub fn character(t: char) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::character(t)) |
| } else { |
| Literal::Fallback(fallback::Literal::character(t)) |
| } |
| } |
| |
| pub fn byte_string(bytes: &[u8]) -> Literal { |
| if inside_proc_macro() { |
| Literal::Compiler(proc_macro::Literal::byte_string(bytes)) |
| } else { |
| Literal::Fallback(fallback::Literal::byte_string(bytes)) |
| } |
| } |
| |
| pub fn span(&self) -> Span { |
| match self { |
| Literal::Compiler(lit) => Span::Compiler(lit.span()), |
| Literal::Fallback(lit) => Span::Fallback(lit.span()), |
| } |
| } |
| |
| pub fn set_span(&mut self, span: Span) { |
| match (self, span) { |
| (Literal::Compiler(lit), Span::Compiler(s)) => lit.set_span(s), |
| (Literal::Fallback(lit), Span::Fallback(s)) => lit.set_span(s), |
| _ => mismatch(), |
| } |
| } |
| |
| pub fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> { |
| match self { |
| #[cfg(proc_macro_span)] |
| Literal::Compiler(lit) => lit.subspan(range).map(Span::Compiler), |
| #[cfg(not(proc_macro_span))] |
| Literal::Compiler(_lit) => None, |
| Literal::Fallback(lit) => lit.subspan(range).map(Span::Fallback), |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::Literal { |
| match self { |
| Literal::Compiler(s) => s, |
| Literal::Fallback(_) => mismatch(), |
| } |
| } |
| } |
| |
| impl From<fallback::Literal> for Literal { |
| fn from(s: fallback::Literal) -> Self { |
| Literal::Fallback(s) |
| } |
| } |
| |
| impl FromStr for Literal { |
| type Err = LexError; |
| |
| fn from_str(repr: &str) -> Result<Self, Self::Err> { |
| if inside_proc_macro() { |
| let literal = proc_macro::Literal::from_str(repr)?; |
| Ok(Literal::Compiler(literal)) |
| } else { |
| let literal = fallback::Literal::from_str(repr)?; |
| Ok(Literal::Fallback(literal)) |
| } |
| } |
| } |
| |
| impl Display for Literal { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Literal::Compiler(t) => Display::fmt(t, f), |
| Literal::Fallback(t) => Display::fmt(t, f), |
| } |
| } |
| } |
| |
| impl Debug for Literal { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Literal::Compiler(t) => Debug::fmt(t, f), |
| Literal::Fallback(t) => Debug::fmt(t, f), |
| } |
| } |
| } |
