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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};
#[cfg(span_locations)]
use core::ops::Range;
use core::ops::RangeBounds;
use core::str::FromStr;
use std::ffi::CStr;
use std::panic;
#[cfg(super_unstable)]
use std::path::PathBuf;
#[derive(Clone)]
pub(crate) enum TokenStream {
Compiler(DeferredTokenStream),
Fallback(fallback::TokenStream),
}
// 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),
// Rustc was supposed to return a LexError, but it panicked instead.
CompilerPanic,
}
#[cold]
fn mismatch(line: u32) -> ! {
#[cfg(procmacro2_backtrace)]
{
let backtrace = std::backtrace::Backtrace::force_capture();
panic!("compiler/fallback mismatch #{}\n\n{}", line, backtrace)
}
#[cfg(not(procmacro2_backtrace))]
{
panic!("compiler/fallback mismatch #{}", line)
}
}
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(line!()),
}
}
fn unwrap_stable(self) -> fallback::TokenStream {
match self {
TokenStream::Compiler(_) => mismatch(line!()),
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()?))
}
}
}
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::CompilerPanic))
}
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(line!()),
}));
TokenStream::Compiler(first)
}
Some(TokenStream::Fallback(mut first)) => {
first.extend(streams.map(|s| match s {
TokenStream::Fallback(s) => s,
TokenStream::Compiler(_) => mismatch(line!()),
}));
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(_) | LexError::CompilerPanic => 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),
LexError::CompilerPanic => {
let fallback = fallback::LexError::call_site();
Debug::fmt(&fallback, 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),
LexError::CompilerPanic => {
let fallback = fallback::LexError::call_site();
Display::fmt(&fallback, 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)),
(Span::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
(Span::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
}
}
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)),
(Span::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
(Span::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
}
}
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 byte_range(&self) -> Range<usize> {
match self {
#[cfg(proc_macro_span)]
Span::Compiler(s) => s.byte_range(),
#[cfg(not(proc_macro_span))]
Span::Compiler(_) => 0..0,
Span::Fallback(s) => s.byte_range(),
}
}
#[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(line!()),
}
}
}
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),
(Group::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
(Group::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
}
}
fn unwrap_nightly(self) -> proc_macro::Group {
match self {
Group::Compiler(g) => g,
Group::Fallback(_) => mismatch(line!()),
}
}
}
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 {
#[track_caller]
pub fn new_checked(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_checked(string, s)),
}
}
pub fn new_unchecked(string: &str, span: fallback::Span) -> Self {
Ident::Fallback(fallback::Ident::new_unchecked(string, span))
}
#[track_caller]
pub fn new_raw_checked(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_checked(string, s)),
}
}
pub fn new_raw_unchecked(string: &str, span: fallback::Span) -> Self {
Ident::Fallback(fallback::Ident::new_raw_unchecked(string, span))
}
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),
(Ident::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
(Ident::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
}
}
fn unwrap_nightly(self) -> proc_macro::Ident {
match self {
Ident::Compiler(s) => s,
Ident::Fallback(_) => mismatch(line!()),
}
}
}
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,
(Ident::Compiler(_), Ident::Fallback(_)) => mismatch(line!()),
(Ident::Fallback(_), Ident::Compiler(_)) => mismatch(line!()),
}
}
}
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(unsafe { 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(string: &str) -> Literal {
if inside_proc_macro() {
Literal::Compiler(proc_macro::Literal::string(string))
} else {
Literal::Fallback(fallback::Literal::string(string))
}
}
pub fn character(ch: char) -> Literal {
if inside_proc_macro() {
Literal::Compiler(proc_macro::Literal::character(ch))
} else {
Literal::Fallback(fallback::Literal::character(ch))
}
}
pub fn byte_character(byte: u8) -> Literal {
if inside_proc_macro() {
Literal::Compiler({
#[cfg(not(no_literal_byte_character))]
{
proc_macro::Literal::byte_character(byte)
}
#[cfg(no_literal_byte_character)]
{
let fallback = fallback::Literal::byte_character(byte);
fallback.repr.parse::<proc_macro::Literal>().unwrap()
}
})
} else {
Literal::Fallback(fallback::Literal::byte_character(byte))
}
}
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 c_string(string: &CStr) -> Literal {
if inside_proc_macro() {
Literal::Compiler({
#[cfg(not(no_literal_c_string))]
{
proc_macro::Literal::c_string(string)
}
#[cfg(no_literal_c_string)]
{
let fallback = fallback::Literal::c_string(string);
fallback.repr.parse::<proc_macro::Literal>().unwrap()
}
})
} else {
Literal::Fallback(fallback::Literal::c_string(string))
}
}
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),
(Literal::Compiler(_), Span::Fallback(_)) => mismatch(line!()),
(Literal::Fallback(_), Span::Compiler(_)) => mismatch(line!()),
}
}
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(line!()),
}
}
}
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),
}
}
}
#[cfg(span_locations)]
pub(crate) fn invalidate_current_thread_spans() {
if inside_proc_macro() {
panic!(
"proc_macro2::extra::invalidate_current_thread_spans is not available in procedural macros"
);
} else {
crate::fallback::invalidate_current_thread_spans();
}
}