| use std::fmt; |
| use std::iter; |
| use std::panic::{self, PanicInfo}; |
| #[cfg(super_unstable)] |
| use std::path::PathBuf; |
| use std::str::FromStr; |
| |
| use fallback; |
| use proc_macro; |
| |
| use {Delimiter, Punct, Spacing, TokenTree}; |
| |
| #[derive(Clone)] |
| pub enum TokenStream { |
| Compiler(proc_macro::TokenStream), |
| Fallback(fallback::TokenStream), |
| } |
| |
| pub enum LexError { |
| Compiler(proc_macro::LexError), |
| Fallback(fallback::LexError), |
| } |
| |
| fn nightly_works() -> bool { |
| use std::sync::atomic::*; |
| use std::sync::Once; |
| |
| #[allow(deprecated)] |
| static WORKS: AtomicUsize = ATOMIC_USIZE_INIT; |
| static INIT: Once = Once::new(); |
| |
| match WORKS.load(Ordering::SeqCst) { |
| 1 => return false, |
| 2 => return true, |
| _ => {} |
| } |
| |
| // Swap in a null panic hook to avoid printing "thread panicked" to stderr, |
| // then use catch_unwind to determine whether the compiler's proc_macro is |
| // working. When proc-macro2 is used from outside of a procedural macro all |
| // of the proc_macro crate's APIs currently panic. |
| // |
| // The Once is to prevent the possibility of this ordering: |
| // |
| // thread 1 calls take_hook, gets the user's original hook |
| // thread 1 calls set_hook with the null hook |
| // thread 2 calls take_hook, thinks null hook is the original hook |
| // thread 2 calls set_hook with the null hook |
| // thread 1 calls set_hook with the actual original hook |
| // thread 2 calls set_hook with what it thinks is the original hook |
| // |
| // in which the user's hook has been lost. |
| // |
| // There is still a race condition where a panic in a different thread can |
| // happen during the interval that the user's original panic hook is |
| // unregistered such that their hook is incorrectly not called. This is |
| // sufficiently unlikely and less bad than printing panic messages to stderr |
| // on correct use of this crate. Maybe there is a libstd feature request |
| // here. For now, if a user needs to guarantee that this failure mode does |
| // not occur, they need to call e.g. `proc_macro2::Span::call_site()` from |
| // the main thread before launching any other threads. |
| INIT.call_once(|| { |
| type PanicHook = Fn(&PanicInfo) + Sync + Send + 'static; |
| |
| let null_hook: Box<PanicHook> = Box::new(|_panic_info| { /* ignore */ }); |
| let sanity_check = &*null_hook as *const PanicHook; |
| let original_hook = panic::take_hook(); |
| panic::set_hook(null_hook); |
| |
| let works = panic::catch_unwind(|| proc_macro::Span::call_site()).is_ok(); |
| WORKS.store(works as usize + 1, Ordering::SeqCst); |
| |
| let hopefully_null_hook = panic::take_hook(); |
| panic::set_hook(original_hook); |
| if sanity_check != &*hopefully_null_hook { |
| panic!("observed race condition in proc_macro2::nightly_works"); |
| } |
| }); |
| nightly_works() |
| } |
| |
| fn mismatch() -> ! { |
| panic!("stable/nightly mismatch") |
| } |
| |
| impl TokenStream { |
| pub fn new() -> TokenStream { |
| if nightly_works() { |
| TokenStream::Compiler(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, |
| 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 nightly_works() { |
| Ok(TokenStream::Compiler(src.parse()?)) |
| } else { |
| Ok(TokenStream::Fallback(src.parse()?)) |
| } |
| } |
| } |
| |
| impl fmt::Display for TokenStream { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| TokenStream::Compiler(tts) => tts.fmt(f), |
| TokenStream::Fallback(tts) => tts.fmt(f), |
| } |
| } |
| } |
| |
| impl From<proc_macro::TokenStream> for TokenStream { |
| fn from(inner: proc_macro::TokenStream) -> TokenStream { |
| TokenStream::Compiler(inner) |
| } |
| } |
| |
| impl From<TokenStream> for proc_macro::TokenStream { |
| fn from(inner: TokenStream) -> proc_macro::TokenStream { |
| match inner { |
| TokenStream::Compiler(inner) => inner, |
| TokenStream::Fallback(inner) => inner.to_string().parse().unwrap(), |
| } |
| } |
| } |
| |
| impl From<fallback::TokenStream> for TokenStream { |
| fn from(inner: fallback::TokenStream) -> TokenStream { |
| TokenStream::Fallback(inner) |
| } |
| } |
| |
| impl From<TokenTree> for TokenStream { |
| fn from(token: TokenTree) -> TokenStream { |
| if !nightly_works() { |
| return TokenStream::Fallback(token.into()); |
| } |
| let tt: 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 op = proc_macro::Punct::new(tt.as_char(), spacing); |
| op.set_span(tt.span().inner.unwrap_nightly()); |
| op.into() |
| } |
| TokenTree::Ident(tt) => tt.inner.unwrap_nightly().into(), |
| TokenTree::Literal(tt) => tt.inner.unwrap_nightly().into(), |
| }; |
| TokenStream::Compiler(tt.into()) |
| } |
| } |
| |
| impl iter::FromIterator<TokenTree> for TokenStream { |
| fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self { |
| if nightly_works() { |
| let trees = trees |
| .into_iter() |
| .map(TokenStream::from) |
| .flat_map(|t| match t { |
| TokenStream::Compiler(s) => s, |
| TokenStream::Fallback(_) => mismatch(), |
| }); |
| TokenStream::Compiler(trees.collect()) |
| } else { |
| TokenStream::Fallback(trees.into_iter().collect()) |
| } |
| } |
| } |
| |
| impl iter::FromIterator<TokenStream> for TokenStream { |
| fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self { |
| let mut streams = streams.into_iter(); |
| match streams.next() { |
| #[cfg(slow_extend)] |
| Some(TokenStream::Compiler(first)) => { |
| let stream = iter::once(first) |
| .chain(streams.map(|s| match s { |
| TokenStream::Compiler(s) => s, |
| TokenStream::Fallback(_) => mismatch(), |
| })) |
| .collect(); |
| TokenStream::Compiler(stream) |
| } |
| #[cfg(not(slow_extend))] |
| Some(TokenStream::Compiler(mut first)) => { |
| first.extend(streams.map(|s| match s { |
| TokenStream::Compiler(s) => s, |
| 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, streams: I) { |
| match self { |
| TokenStream::Compiler(tts) => { |
| #[cfg(not(slow_extend))] |
| { |
| tts.extend( |
| streams |
| .into_iter() |
| .map(|t| TokenStream::from(t).unwrap_nightly()), |
| ); |
| } |
| #[cfg(slow_extend)] |
| { |
| *tts = |
| tts.clone() |
| .into_iter() |
| .chain(streams.into_iter().map(TokenStream::from).flat_map( |
| |t| match t { |
| TokenStream::Compiler(tts) => tts.into_iter(), |
| _ => mismatch(), |
| }, |
| )) |
| .collect(); |
| } |
| } |
| TokenStream::Fallback(tts) => tts.extend(streams), |
| } |
| } |
| } |
| |
| impl Extend<TokenStream> for TokenStream { |
| fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) { |
| match self { |
| TokenStream::Compiler(tts) => { |
| #[cfg(not(slow_extend))] |
| { |
| tts.extend(streams.into_iter().map(|stream| stream.unwrap_nightly())); |
| } |
| #[cfg(slow_extend)] |
| { |
| *tts = tts |
| .clone() |
| .into_iter() |
| .chain(streams.into_iter().flat_map(|t| match t { |
| TokenStream::Compiler(tts) => tts.into_iter(), |
| _ => mismatch(), |
| })) |
| .collect(); |
| } |
| } |
| TokenStream::Fallback(tts) => { |
| tts.extend(streams.into_iter().map(|stream| stream.unwrap_stable())) |
| } |
| } |
| } |
| } |
| |
| impl fmt::Debug for TokenStream { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| TokenStream::Compiler(tts) => tts.fmt(f), |
| TokenStream::Fallback(tts) => tts.fmt(f), |
| } |
| } |
| } |
| |
| impl From<proc_macro::LexError> for LexError { |
| fn from(e: proc_macro::LexError) -> LexError { |
| LexError::Compiler(e) |
| } |
| } |
| |
| impl From<fallback::LexError> for LexError { |
| fn from(e: fallback::LexError) -> LexError { |
| LexError::Fallback(e) |
| } |
| } |
| |
| impl fmt::Debug for LexError { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| LexError::Compiler(e) => e.fmt(f), |
| LexError::Fallback(e) => e.fmt(f), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub 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_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) => ::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(::Span::_new(Span::Compiler(tt.span()))); |
| o.into() |
| } |
| proc_macro::TokenTree::Ident(s) => ::Ident::_new(Ident::Compiler(s)).into(), |
| proc_macro::TokenTree::Literal(l) => ::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(), |
| } |
| } |
| } |
| |
| impl fmt::Debug for TokenTreeIter { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| f.debug_struct("TokenTreeIter").finish() |
| } |
| } |
| |
| #[derive(Clone, PartialEq, Eq)] |
| #[cfg(super_unstable)] |
| pub 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 fmt::Debug for SourceFile { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| SourceFile::Compiler(a) => a.fmt(f), |
| SourceFile::Fallback(a) => a.fmt(f), |
| } |
| } |
| } |
| |
| #[cfg(any(super_unstable, feature = "span-locations"))] |
| pub struct LineColumn { |
| pub line: usize, |
| pub column: usize, |
| } |
| |
| #[derive(Copy, Clone)] |
| pub enum Span { |
| Compiler(proc_macro::Span), |
| Fallback(fallback::Span), |
| } |
| |
| impl Span { |
| pub fn call_site() -> Span { |
| if nightly_works() { |
| Span::Compiler(proc_macro::Span::call_site()) |
| } else { |
| Span::Fallback(fallback::Span::call_site()) |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn def_site() -> Span { |
| if nightly_works() { |
| Span::Compiler(proc_macro::Span::def_site()) |
| } else { |
| Span::Fallback(fallback::Span::def_site()) |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| 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(), |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| 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(any(super_unstable, feature = "span-locations"))] |
| pub fn start(&self) -> LineColumn { |
| match self { |
| #[cfg(proc_macro_span)] |
| Span::Compiler(s) => { |
| let proc_macro::LineColumn { line, column } = s.start(); |
| LineColumn { line, column } |
| } |
| #[cfg(not(proc_macro_span))] |
| Span::Compiler(_) => LineColumn { line: 0, column: 0 }, |
| Span::Fallback(s) => { |
| let fallback::LineColumn { line, column } = s.start(); |
| LineColumn { line, column } |
| } |
| } |
| } |
| |
| #[cfg(any(super_unstable, feature = "span-locations"))] |
| pub fn end(&self) -> LineColumn { |
| match self { |
| #[cfg(proc_macro_span)] |
| Span::Compiler(s) => { |
| let proc_macro::LineColumn { line, column } = s.end(); |
| LineColumn { line, column } |
| } |
| #[cfg(not(proc_macro_span))] |
| Span::Compiler(_) => LineColumn { line: 0, column: 0 }, |
| Span::Fallback(s) => { |
| let fallback::LineColumn { line, column } = s.end(); |
| LineColumn { line, column } |
| } |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn join(&self, other: Span) -> Option<Span> { |
| let ret = match (self, other) { |
| (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, |
| } |
| } |
| |
| fn unwrap_nightly(self) -> proc_macro::Span { |
| match self { |
| Span::Compiler(s) => s, |
| Span::Fallback(_) => mismatch(), |
| } |
| } |
| } |
| |
| impl From<proc_macro::Span> for ::Span { |
| fn from(proc_span: proc_macro::Span) -> ::Span { |
| ::Span::_new(Span::Compiler(proc_span)) |
| } |
| } |
| |
| impl From<fallback::Span> for Span { |
| fn from(inner: fallback::Span) -> Span { |
| Span::Fallback(inner) |
| } |
| } |
| |
| impl fmt::Debug for Span { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Span::Compiler(s) => s.fmt(f), |
| Span::Fallback(s) => s.fmt(f), |
| } |
| } |
| } |
| |
| pub 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 enum Group { |
| Compiler(proc_macro::Group), |
| Fallback(fallback::Group), |
| } |
| |
| impl Group { |
| pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group { |
| match stream { |
| TokenStream::Compiler(stream) => { |
| 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, 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(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()), |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| pub fn span_open(&self) -> Span { |
| match self { |
| Group::Compiler(g) => Span::Compiler(g.span_open()), |
| Group::Fallback(g) => Span::Fallback(g.span_open()), |
| } |
| } |
| |
| #[cfg(super_unstable)] |
| 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 fmt::Display for Group { |
| fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Group::Compiler(group) => group.fmt(formatter), |
| Group::Fallback(group) => group.fmt(formatter), |
| } |
| } |
| } |
| |
| impl fmt::Debug for Group { |
| fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Group::Compiler(group) => group.fmt(formatter), |
| Group::Fallback(group) => group.fmt(formatter), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub enum Ident { |
| Compiler(proc_macro::Ident), |
| Fallback(fallback::Ident), |
| } |
| |
| impl Ident { |
| pub fn new(string: &str, span: Span) -> Ident { |
| 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) -> Ident { |
| match span { |
| Span::Compiler(s) => { |
| let p: proc_macro::TokenStream = string.parse().unwrap(); |
| let ident = match p.into_iter().next() { |
| Some(proc_macro::TokenTree::Ident(mut i)) => { |
| i.set_span(s); |
| i |
| } |
| _ => panic!(), |
| }; |
| Ident::Compiler(ident) |
| } |
| 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 fmt::Display for Ident { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Ident::Compiler(t) => t.fmt(f), |
| Ident::Fallback(t) => t.fmt(f), |
| } |
| } |
| } |
| |
| impl fmt::Debug for Ident { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Ident::Compiler(t) => t.fmt(f), |
| Ident::Fallback(t) => t.fmt(f), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub enum Literal { |
| Compiler(proc_macro::Literal), |
| Fallback(fallback::Literal), |
| } |
| |
| macro_rules! suffixed_numbers { |
| ($($name:ident => $kind:ident,)*) => ($( |
| pub fn $name(n: $kind) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::$name(n)) |
| } else { |
| Literal::Fallback(fallback::Literal::$name(n)) |
| } |
| } |
| )*) |
| } |
| |
| macro_rules! unsuffixed_integers { |
| ($($name:ident => $kind:ident,)*) => ($( |
| pub fn $name(n: $kind) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::$name(n)) |
| } else { |
| Literal::Fallback(fallback::Literal::$name(n)) |
| } |
| } |
| )*) |
| } |
| |
| impl Literal { |
| suffixed_numbers! { |
| u8_suffixed => u8, |
| u16_suffixed => u16, |
| u32_suffixed => u32, |
| u64_suffixed => u64, |
| usize_suffixed => usize, |
| i8_suffixed => i8, |
| i16_suffixed => i16, |
| i32_suffixed => i32, |
| i64_suffixed => i64, |
| isize_suffixed => isize, |
| |
| f32_suffixed => f32, |
| f64_suffixed => f64, |
| } |
| |
| #[cfg(u128)] |
| suffixed_numbers! { |
| i128_suffixed => i128, |
| u128_suffixed => u128, |
| } |
| |
| unsuffixed_integers! { |
| u8_unsuffixed => u8, |
| u16_unsuffixed => u16, |
| u32_unsuffixed => u32, |
| u64_unsuffixed => u64, |
| usize_unsuffixed => usize, |
| i8_unsuffixed => i8, |
| i16_unsuffixed => i16, |
| i32_unsuffixed => i32, |
| i64_unsuffixed => i64, |
| isize_unsuffixed => isize, |
| } |
| |
| #[cfg(u128)] |
| unsuffixed_integers! { |
| i128_unsuffixed => i128, |
| u128_unsuffixed => u128, |
| } |
| |
| pub fn f32_unsuffixed(f: f32) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::f32_unsuffixed(f)) |
| } else { |
| Literal::Fallback(fallback::Literal::f32_unsuffixed(f)) |
| } |
| } |
| |
| pub fn f64_unsuffixed(f: f64) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::f64_unsuffixed(f)) |
| } else { |
| Literal::Fallback(fallback::Literal::f64_unsuffixed(f)) |
| } |
| } |
| |
| pub fn string(t: &str) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::string(t)) |
| } else { |
| Literal::Fallback(fallback::Literal::string(t)) |
| } |
| } |
| |
| pub fn character(t: char) -> Literal { |
| if nightly_works() { |
| Literal::Compiler(proc_macro::Literal::character(t)) |
| } else { |
| Literal::Fallback(fallback::Literal::character(t)) |
| } |
| } |
| |
| pub fn byte_string(bytes: &[u8]) -> Literal { |
| if nightly_works() { |
| 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(), |
| } |
| } |
| |
| 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) -> Literal { |
| Literal::Fallback(s) |
| } |
| } |
| |
| impl fmt::Display for Literal { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Literal::Compiler(t) => t.fmt(f), |
| Literal::Fallback(t) => t.fmt(f), |
| } |
| } |
| } |
| |
| impl fmt::Debug for Literal { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| match self { |
| Literal::Compiler(t) => t.fmt(f), |
| Literal::Fallback(t) => t.fmt(f), |
| } |
| } |
| } |
