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+//! A support library for macro authors when defining new macros.
+//!
+//! This library, provided by the standard distribution, provides the types
+//! consumed in the interfaces of procedurally defined macro definitions such as
+//! function-like macros `#[proc_macro]`, macro attributes `#[proc_macro_attribute]` and
+//! custom derive attributes`#[proc_macro_derive]`.
+//!
+//! See [the book] for more.
+//!
+//! [the book]: ../book/ch19-06-macros.html#procedural-macros-for-generating-code-from-attributes
+
+#![stable(feature = "proc_macro_lib", since = "1.15.0")]
+#![deny(missing_docs)]
+#![doc(
+ html_playground_url = "https://play.rust-lang.org/",
+ issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
+ test(no_crate_inject, attr(deny(warnings))),
+ test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
+)]
+// This library is copied into rust-analyzer to allow loading rustc compiled proc macros.
+// Please avoid unstable features where possible to minimize the amount of changes necessary
+// to make it compile with rust-analyzer on stable.
+#![feature(rustc_allow_const_fn_unstable)]
+#![feature(staged_api)]
+#![feature(allow_internal_unstable)]
+#![feature(decl_macro)]
+#![feature(local_key_cell_methods)]
+#![feature(maybe_uninit_write_slice)]
+#![feature(negative_impls)]
+#![feature(new_uninit)]
+#![feature(restricted_std)]
+#![feature(rustc_attrs)]
+#![feature(min_specialization)]
+#![feature(strict_provenance)]
+#![recursion_limit = "256"]
+
+#[unstable(feature = "proc_macro_internals", issue = "27812")]
+#[doc(hidden)]
+pub mod bridge;
+
+mod diagnostic;
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+pub use diagnostic::{Diagnostic, Level, MultiSpan};
+
+use std::cmp::Ordering;
+use std::ops::RangeBounds;
+use std::path::PathBuf;
+use std::str::FromStr;
+use std::{error, fmt, iter};
+
+/// Determines whether proc_macro has been made accessible to the currently
+/// running program.
+///
+/// The proc_macro crate is only intended for use inside the implementation of
+/// procedural macros. All the functions in this crate panic if invoked from
+/// outside of a procedural macro, such as from a build script or unit test or
+/// ordinary Rust binary.
+///
+/// With consideration for Rust libraries that are designed to support both
+/// macro and non-macro use cases, `proc_macro::is_available()` provides a
+/// non-panicking way to detect whether the infrastructure required to use the
+/// API of proc_macro is presently available. Returns true if invoked from
+/// inside of a procedural macro, false if invoked from any other binary.
+#[stable(feature = "proc_macro_is_available", since = "1.57.0")]
+pub fn is_available() -> bool {
+ bridge::client::is_available()
+}
+
+/// The main type provided by this crate, representing an abstract stream of
+/// tokens, or, more specifically, a sequence of token trees.
+/// The type provide interfaces for iterating over those token trees and, conversely,
+/// collecting a number of token trees into one stream.
+///
+/// This is both the input and output of `#[proc_macro]`, `#[proc_macro_attribute]`
+/// and `#[proc_macro_derive]` definitions.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+#[derive(Clone)]
+pub struct TokenStream(Option<bridge::client::TokenStream>);
+
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Send for TokenStream {}
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Sync for TokenStream {}
+
+/// Error returned from `TokenStream::from_str`.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+#[non_exhaustive]
+#[derive(Debug)]
+pub struct LexError;
+
+#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
+impl fmt::Display for LexError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("cannot parse string into token stream")
+ }
+}
+
+#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
+impl error::Error for LexError {}
+
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Send for LexError {}
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Sync for LexError {}
+
+/// Error returned from `TokenStream::expand_expr`.
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+#[non_exhaustive]
+#[derive(Debug)]
+pub struct ExpandError;
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl fmt::Display for ExpandError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("macro expansion failed")
+ }
+}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl error::Error for ExpandError {}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl !Send for ExpandError {}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl !Sync for ExpandError {}
+
+impl TokenStream {
+ /// Returns an empty `TokenStream` containing no token trees.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new() -> TokenStream {
+ TokenStream(None)
+ }
+
+ /// Checks if this `TokenStream` is empty.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn is_empty(&self) -> bool {
+ self.0.as_ref().map(|h| h.is_empty()).unwrap_or(true)
+ }
+
+ /// Parses this `TokenStream` as an expression and attempts to expand any
+ /// macros within it. Returns the expanded `TokenStream`.
+ ///
+ /// Currently only expressions expanding to literals will succeed, although
+ /// this may be relaxed in the future.
+ ///
+ /// NOTE: In error conditions, `expand_expr` may leave macros unexpanded,
+ /// report an error, failing compilation, and/or return an `Err(..)`. The
+ /// specific behavior for any error condition, and what conditions are
+ /// considered errors, is unspecified and may change in the future.
+ #[unstable(feature = "proc_macro_expand", issue = "90765")]
+ pub fn expand_expr(&self) -> Result<TokenStream, ExpandError> {
+ let stream = self.0.as_ref().ok_or(ExpandError)?;
+ match bridge::client::TokenStream::expand_expr(stream) {
+ Ok(stream) => Ok(TokenStream(Some(stream))),
+ Err(_) => Err(ExpandError),
+ }
+ }
+}
+
+/// Attempts to break the string into tokens and parse those tokens into a token stream.
+/// May fail for a number of reasons, for example, if the string contains unbalanced delimiters
+/// or characters not existing in the language.
+/// All tokens in the parsed stream get `Span::call_site()` spans.
+///
+/// NOTE: some errors may cause panics instead of returning `LexError`. We reserve the right to
+/// change these errors into `LexError`s later.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl FromStr for TokenStream {
+ type Err = LexError;
+
+ fn from_str(src: &str) -> Result<TokenStream, LexError> {
+ Ok(TokenStream(Some(bridge::client::TokenStream::from_str(src))))
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl ToString for TokenStream {
+ fn to_string(&self) -> String {
+ self.0.as_ref().map(|t| t.to_string()).unwrap_or_default()
+ }
+}
+
+/// Prints the token stream as a string that is supposed to be losslessly convertible back
+/// into the same token stream (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters and negative numeric literals.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl fmt::Display for TokenStream {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+/// Prints token in a form convenient for debugging.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl fmt::Debug for TokenStream {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("TokenStream ")?;
+ f.debug_list().entries(self.clone()).finish()
+ }
+}
+
+#[stable(feature = "proc_macro_token_stream_default", since = "1.45.0")]
+impl Default for TokenStream {
+ fn default() -> Self {
+ TokenStream::new()
+ }
+}
+
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+pub use quote::{quote, quote_span};
+
+fn tree_to_bridge_tree(
+ tree: TokenTree,
+) -> bridge::TokenTree<bridge::client::TokenStream, bridge::client::Span, bridge::client::Symbol> {
+ match tree {
+ TokenTree::Group(tt) => bridge::TokenTree::Group(tt.0),
+ TokenTree::Punct(tt) => bridge::TokenTree::Punct(tt.0),
+ TokenTree::Ident(tt) => bridge::TokenTree::Ident(tt.0),
+ TokenTree::Literal(tt) => bridge::TokenTree::Literal(tt.0),
+ }
+}
+
+/// Creates a token stream containing a single token tree.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<TokenTree> for TokenStream {
+ fn from(tree: TokenTree) -> TokenStream {
+ TokenStream(Some(bridge::client::TokenStream::from_token_tree(tree_to_bridge_tree(tree))))
+ }
+}
+
+/// Non-generic helper for implementing `FromIterator<TokenTree>` and
+/// `Extend<TokenTree>` with less monomorphization in calling crates.
+struct ConcatTreesHelper {
+ trees: Vec<
+ bridge::TokenTree<
+ bridge::client::TokenStream,
+ bridge::client::Span,
+ bridge::client::Symbol,
+ >,
+ >,
+}
+
+impl ConcatTreesHelper {
+ fn new(capacity: usize) -> Self {
+ ConcatTreesHelper { trees: Vec::with_capacity(capacity) }
+ }
+
+ fn push(&mut self, tree: TokenTree) {
+ self.trees.push(tree_to_bridge_tree(tree));
+ }
+
+ fn build(self) -> TokenStream {
+ if self.trees.is_empty() {
+ TokenStream(None)
+ } else {
+ TokenStream(Some(bridge::client::TokenStream::concat_trees(None, self.trees)))
+ }
+ }
+
+ fn append_to(self, stream: &mut TokenStream) {
+ if self.trees.is_empty() {
+ return;
+ }
+ stream.0 = Some(bridge::client::TokenStream::concat_trees(stream.0.take(), self.trees))
+ }
+}
+
+/// Non-generic helper for implementing `FromIterator<TokenStream>` and
+/// `Extend<TokenStream>` with less monomorphization in calling crates.
+struct ConcatStreamsHelper {
+ streams: Vec<bridge::client::TokenStream>,
+}
+
+impl ConcatStreamsHelper {
+ fn new(capacity: usize) -> Self {
+ ConcatStreamsHelper { streams: Vec::with_capacity(capacity) }
+ }
+
+ fn push(&mut self, stream: TokenStream) {
+ if let Some(stream) = stream.0 {
+ self.streams.push(stream);
+ }
+ }
+
+ fn build(mut self) -> TokenStream {
+ if self.streams.len() <= 1 {
+ TokenStream(self.streams.pop())
+ } else {
+ TokenStream(Some(bridge::client::TokenStream::concat_streams(None, self.streams)))
+ }
+ }
+
+ fn append_to(mut self, stream: &mut TokenStream) {
+ if self.streams.is_empty() {
+ return;
+ }
+ let base = stream.0.take();
+ if base.is_none() && self.streams.len() == 1 {
+ stream.0 = self.streams.pop();
+ } else {
+ stream.0 = Some(bridge::client::TokenStream::concat_streams(base, self.streams));
+ }
+ }
+}
+
+/// Collects a number of token trees into a single stream.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl iter::FromIterator<TokenTree> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self {
+ let iter = trees.into_iter();
+ let mut builder = ConcatTreesHelper::new(iter.size_hint().0);
+ iter.for_each(|tree| builder.push(tree));
+ builder.build()
+ }
+}
+
+/// A "flattening" operation on token streams, collects token trees
+/// from multiple token streams into a single stream.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl iter::FromIterator<TokenStream> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
+ let iter = streams.into_iter();
+ let mut builder = ConcatStreamsHelper::new(iter.size_hint().0);
+ iter.for_each(|stream| builder.push(stream));
+ builder.build()
+ }
+}
+
+#[stable(feature = "token_stream_extend", since = "1.30.0")]
+impl Extend<TokenTree> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, trees: I) {
+ let iter = trees.into_iter();
+ let mut builder = ConcatTreesHelper::new(iter.size_hint().0);
+ iter.for_each(|tree| builder.push(tree));
+ builder.append_to(self);
+ }
+}
+
+#[stable(feature = "token_stream_extend", since = "1.30.0")]
+impl Extend<TokenStream> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
+ let iter = streams.into_iter();
+ let mut builder = ConcatStreamsHelper::new(iter.size_hint().0);
+ iter.for_each(|stream| builder.push(stream));
+ builder.append_to(self);
+ }
+}
+
+/// Public implementation details for the `TokenStream` type, such as iterators.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub mod token_stream {
+ use crate::{bridge, Group, Ident, Literal, Punct, TokenStream, TokenTree};
+
+ /// An iterator over `TokenStream`'s `TokenTree`s.
+ /// The iteration is "shallow", e.g., the iterator doesn't recurse into delimited groups,
+ /// and returns whole groups as token trees.
+ #[derive(Clone)]
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub struct IntoIter(
+ std::vec::IntoIter<
+ bridge::TokenTree<
+ bridge::client::TokenStream,
+ bridge::client::Span,
+ bridge::client::Symbol,
+ >,
+ >,
+ );
+
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ impl Iterator for IntoIter {
+ type Item = TokenTree;
+
+ fn next(&mut self) -> Option<TokenTree> {
+ self.0.next().map(|tree| match tree {
+ bridge::TokenTree::Group(tt) => TokenTree::Group(Group(tt)),
+ bridge::TokenTree::Punct(tt) => TokenTree::Punct(Punct(tt)),
+ bridge::TokenTree::Ident(tt) => TokenTree::Ident(Ident(tt)),
+ bridge::TokenTree::Literal(tt) => TokenTree::Literal(Literal(tt)),
+ })
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.0.size_hint()
+ }
+
+ fn count(self) -> usize {
+ self.0.count()
+ }
+ }
+
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ impl IntoIterator for TokenStream {
+ type Item = TokenTree;
+ type IntoIter = IntoIter;
+
+ fn into_iter(self) -> IntoIter {
+ IntoIter(self.0.map(|v| v.into_trees()).unwrap_or_default().into_iter())
+ }
+ }
+}
+
+/// `quote!(..)` accepts arbitrary tokens and expands into a `TokenStream` describing the input.
+/// For example, `quote!(a + b)` will produce an expression, that, when evaluated, constructs
+/// the `TokenStream` `[Ident("a"), Punct('+', Alone), Ident("b")]`.
+///
+/// Unquoting is done with `$`, and works by taking the single next ident as the unquoted term.
+/// To quote `$` itself, use `$$`.
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+#[allow_internal_unstable(proc_macro_def_site, proc_macro_internals)]
+#[rustc_builtin_macro]
+pub macro quote($($t:tt)*) {
+ /* compiler built-in */
+}
+
+#[unstable(feature = "proc_macro_internals", issue = "27812")]
+#[doc(hidden)]
+mod quote;
+
+/// A region of source code, along with macro expansion information.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Copy, Clone)]
+pub struct Span(bridge::client::Span);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Span {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Span {}
+
+macro_rules! diagnostic_method {
+ ($name:ident, $level:expr) => {
+ /// Creates a new `Diagnostic` with the given `message` at the span
+ /// `self`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn $name<T: Into<String>>(self, message: T) -> Diagnostic {
+ Diagnostic::spanned(self, $level, message)
+ }
+ };
+}
+
+impl Span {
+ /// A span that resolves at the macro definition site.
+ #[unstable(feature = "proc_macro_def_site", issue = "54724")]
+ pub fn def_site() -> Span {
+ Span(bridge::client::Span::def_site())
+ }
+
+ /// The span of the invocation of the current procedural macro.
+ /// Identifiers created with this span will be resolved as if they were written
+ /// directly at the macro call location (call-site hygiene) and other code
+ /// at the macro call site will be able to refer to them as well.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn call_site() -> Span {
+ Span(bridge::client::Span::call_site())
+ }
+
+ /// A span that represents `macro_rules` hygiene, and sometimes resolves at the macro
+ /// definition site (local variables, labels, `$crate`) and sometimes at the macro
+ /// call site (everything else).
+ /// The span location is taken from the call-site.
+ #[stable(feature = "proc_macro_mixed_site", since = "1.45.0")]
+ pub fn mixed_site() -> Span {
+ Span(bridge::client::Span::mixed_site())
+ }
+
+ /// The original source file into which this span points.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn source_file(&self) -> SourceFile {
+ SourceFile(self.0.source_file())
+ }
+
+ /// The `Span` for the tokens in the previous macro expansion from which
+ /// `self` was generated from, if any.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn parent(&self) -> Option<Span> {
+ self.0.parent().map(Span)
+ }
+
+ /// The span for the origin source code that `self` was generated from. If
+ /// this `Span` wasn't generated from other macro expansions then the return
+ /// value is the same as `*self`.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn source(&self) -> Span {
+ Span(self.0.source())
+ }
+
+ /// Gets the starting line/column in the source file for this span.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn start(&self) -> LineColumn {
+ self.0.start().add_1_to_column()
+ }
+
+ /// Gets the ending line/column in the source file for this span.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn end(&self) -> LineColumn {
+ self.0.end().add_1_to_column()
+ }
+
+ /// Creates an empty span pointing to directly before this span.
+ #[unstable(feature = "proc_macro_span_shrink", issue = "87552")]
+ pub fn before(&self) -> Span {
+ Span(self.0.before())
+ }
+
+ /// Creates an empty span pointing to directly after this span.
+ #[unstable(feature = "proc_macro_span_shrink", issue = "87552")]
+ pub fn after(&self) -> Span {
+ Span(self.0.after())
+ }
+
+ /// Creates a new span encompassing `self` and `other`.
+ ///
+ /// Returns `None` if `self` and `other` are from different files.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn join(&self, other: Span) -> Option<Span> {
+ self.0.join(other.0).map(Span)
+ }
+
+ /// Creates a new span with the same line/column information as `self` but
+ /// that resolves symbols as though it were at `other`.
+ #[stable(feature = "proc_macro_span_resolved_at", since = "1.45.0")]
+ pub fn resolved_at(&self, other: Span) -> Span {
+ Span(self.0.resolved_at(other.0))
+ }
+
+ /// Creates a new span with the same name resolution behavior as `self` but
+ /// with the line/column information of `other`.
+ #[stable(feature = "proc_macro_span_located_at", since = "1.45.0")]
+ pub fn located_at(&self, other: Span) -> Span {
+ other.resolved_at(*self)
+ }
+
+ /// Compares to spans to see if they're equal.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn eq(&self, other: &Span) -> bool {
+ self.0 == other.0
+ }
+
+ /// Returns the source text behind a span. This preserves the original source
+ /// code, including spaces and comments. It only returns a result if the span
+ /// corresponds to real source code.
+ ///
+ /// Note: The observable result of a macro should only rely on the tokens and
+ /// not on this source text. The result of this function is a best effort to
+ /// be used for diagnostics only.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn source_text(&self) -> Option<String> {
+ self.0.source_text()
+ }
+
+ // Used by the implementation of `Span::quote`
+ #[doc(hidden)]
+ #[unstable(feature = "proc_macro_internals", issue = "27812")]
+ pub fn save_span(&self) -> usize {
+ self.0.save_span()
+ }
+
+ // Used by the implementation of `Span::quote`
+ #[doc(hidden)]
+ #[unstable(feature = "proc_macro_internals", issue = "27812")]
+ pub fn recover_proc_macro_span(id: usize) -> Span {
+ Span(bridge::client::Span::recover_proc_macro_span(id))
+ }
+
+ diagnostic_method!(error, Level::Error);
+ diagnostic_method!(warning, Level::Warning);
+ diagnostic_method!(note, Level::Note);
+ diagnostic_method!(help, Level::Help);
+}
+
+/// Prints a span in a form convenient for debugging.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Span {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.0.fmt(f)
+ }
+}
+
+/// A line-column pair representing the start or end of a `Span`.
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct LineColumn {
+ /// The 1-indexed line in the source file on which the span starts or ends (inclusive).
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub line: usize,
+ /// The 1-indexed column (number of bytes in UTF-8 encoding) in the source
+ /// file on which the span starts or ends (inclusive).
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub column: usize,
+}
+
+impl LineColumn {
+ fn add_1_to_column(self) -> Self {
+ LineColumn { line: self.line, column: self.column + 1 }
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl !Send for LineColumn {}
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl !Sync for LineColumn {}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl Ord for LineColumn {
+ fn cmp(&self, other: &Self) -> Ordering {
+ self.line.cmp(&other.line).then(self.column.cmp(&other.column))
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl PartialOrd for LineColumn {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+/// The source file of a given `Span`.
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+#[derive(Clone)]
+pub struct SourceFile(bridge::client::SourceFile);
+
+impl SourceFile {
+ /// Gets the path to this source file.
+ ///
+ /// ### Note
+ /// If the code span associated with this `SourceFile` was generated by an external macro, this
+ /// macro, this might not be an actual path on the filesystem. Use [`is_real`] to check.
+ ///
+ /// Also note that even if `is_real` returns `true`, if `--remap-path-prefix` was passed on
+ /// the command line, the path as given might not actually be valid.
+ ///
+ /// [`is_real`]: Self::is_real
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn path(&self) -> PathBuf {
+ PathBuf::from(self.0.path())
+ }
+
+ /// Returns `true` if this source file is a real source file, and not generated by an external
+ /// macro's expansion.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn is_real(&self) -> bool {
+ // This is a hack until intercrate spans are implemented and we can have real source files
+ // for spans generated in external macros.
+ // https://github.com/rust-lang/rust/pull/43604#issuecomment-333334368
+ self.0.is_real()
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl fmt::Debug for SourceFile {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("SourceFile")
+ .field("path", &self.path())
+ .field("is_real", &self.is_real())
+ .finish()
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl PartialEq for SourceFile {
+ fn eq(&self, other: &Self) -> bool {
+ self.0.eq(&other.0)
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl Eq for SourceFile {}
+
+/// A single token or a delimited sequence of token trees (e.g., `[1, (), ..]`).
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Clone)]
+pub enum TokenTree {
+ /// A token stream surrounded by bracket delimiters.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Group(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Group),
+ /// An identifier.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Ident(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Ident),
+ /// A single punctuation character (`+`, `,`, `$`, etc.).
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Punct(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Punct),
+ /// A literal character (`'a'`), string (`"hello"`), number (`2.3`), etc.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Literal(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Literal),
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for TokenTree {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for TokenTree {}
+
+impl TokenTree {
+ /// Returns the span of this tree, delegating to the `span` method of
+ /// the contained token or a delimited stream.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ match *self {
+ TokenTree::Group(ref t) => t.span(),
+ TokenTree::Ident(ref t) => t.span(),
+ TokenTree::Punct(ref t) => t.span(),
+ TokenTree::Literal(ref t) => t.span(),
+ }
+ }
+
+ /// Configures the span for *only this token*.
+ ///
+ /// Note that if this token is a `Group` then this method will not configure
+ /// the span of each of the internal tokens, this will simply delegate to
+ /// the `set_span` method of each variant.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ match *self {
+ TokenTree::Group(ref mut t) => t.set_span(span),
+ TokenTree::Ident(ref mut t) => t.set_span(span),
+ TokenTree::Punct(ref mut t) => t.set_span(span),
+ TokenTree::Literal(ref mut t) => t.set_span(span),
+ }
+ }
+}
+
+/// Prints token tree in a form convenient for debugging.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for TokenTree {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ // Each of these has the name in the struct type in the derived debug,
+ // so don't bother with an extra layer of indirection
+ match *self {
+ TokenTree::Group(ref tt) => tt.fmt(f),
+ TokenTree::Ident(ref tt) => tt.fmt(f),
+ TokenTree::Punct(ref tt) => tt.fmt(f),
+ TokenTree::Literal(ref tt) => tt.fmt(f),
+ }
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Group> for TokenTree {
+ fn from(g: Group) -> TokenTree {
+ TokenTree::Group(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Ident> for TokenTree {
+ fn from(g: Ident) -> TokenTree {
+ TokenTree::Ident(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Punct> for TokenTree {
+ fn from(g: Punct) -> TokenTree {
+ TokenTree::Punct(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Literal> for TokenTree {
+ fn from(g: Literal) -> TokenTree {
+ TokenTree::Literal(g)
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl ToString for TokenTree {
+ fn to_string(&self) -> String {
+ match *self {
+ TokenTree::Group(ref t) => t.to_string(),
+ TokenTree::Ident(ref t) => t.to_string(),
+ TokenTree::Punct(ref t) => t.to_string(),
+ TokenTree::Literal(ref t) => t.to_string(),
+ }
+ }
+}
+
+/// Prints the token tree as a string that is supposed to be losslessly convertible back
+/// into the same token tree (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters and negative numeric literals.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for TokenTree {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+/// A delimited token stream.
+///
+/// A `Group` internally contains a `TokenStream` which is surrounded by `Delimiter`s.
+#[derive(Clone)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Group(bridge::Group<bridge::client::TokenStream, bridge::client::Span>);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Group {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Group {}
+
+/// Describes how a sequence of token trees is delimited.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub enum Delimiter {
+ /// `( ... )`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Parenthesis,
+ /// `{ ... }`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Brace,
+ /// `[ ... ]`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Bracket,
+ /// `Ø ... Ø`
+ /// An invisible delimiter, that may, for example, appear around tokens coming from a
+ /// "macro variable" `$var`. It is important to preserve operator priorities in cases like
+ /// `$var * 3` where `$var` is `1 + 2`.
+ /// Invisible delimiters might not survive roundtrip of a token stream through a string.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ None,
+}
+
+impl Group {
+ /// Creates a new `Group` with the given delimiter and token stream.
+ ///
+ /// This constructor will set the span for this group to
+ /// `Span::call_site()`. To change the span you can use the `set_span`
+ /// method below.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group {
+ Group(bridge::Group {
+ delimiter,
+ stream: stream.0,
+ span: bridge::DelimSpan::from_single(Span::call_site().0),
+ })
+ }
+
+ /// Returns the delimiter of this `Group`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn delimiter(&self) -> Delimiter {
+ self.0.delimiter
+ }
+
+ /// Returns the `TokenStream` of tokens that are delimited in this `Group`.
+ ///
+ /// Note that the returned token stream does not include the delimiter
+ /// returned above.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn stream(&self) -> TokenStream {
+ TokenStream(self.0.stream.clone())
+ }
+
+ /// Returns the span for the delimiters of this token stream, spanning the
+ /// entire `Group`.
+ ///
+ /// ```text
+ /// pub fn span(&self) -> Span {
+ /// ^^^^^^^
+ /// ```
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span.entire)
+ }
+
+ /// Returns the span pointing to the opening delimiter of this group.
+ ///
+ /// ```text
+ /// pub fn span_open(&self) -> Span {
+ /// ^
+ /// ```
+ #[stable(feature = "proc_macro_group_span", since = "1.55.0")]
+ pub fn span_open(&self) -> Span {
+ Span(self.0.span.open)
+ }
+
+ /// Returns the span pointing to the closing delimiter of this group.
+ ///
+ /// ```text
+ /// pub fn span_close(&self) -> Span {
+ /// ^
+ /// ```
+ #[stable(feature = "proc_macro_group_span", since = "1.55.0")]
+ pub fn span_close(&self) -> Span {
+ Span(self.0.span.close)
+ }
+
+ /// Configures the span for this `Group`'s delimiters, but not its internal
+ /// tokens.
+ ///
+ /// This method will **not** set the span of all the internal tokens spanned
+ /// by this group, but rather it will only set the span of the delimiter
+ /// tokens at the level of the `Group`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = bridge::DelimSpan::from_single(span.0);
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl ToString for Group {
+ fn to_string(&self) -> String {
+ TokenStream::from(TokenTree::from(self.clone())).to_string()
+ }
+}
+
+/// Prints the group as a string that should be losslessly convertible back
+/// into the same group (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Group {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Group {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Group")
+ .field("delimiter", &self.delimiter())
+ .field("stream", &self.stream())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+/// A `Punct` is a single punctuation character such as `+`, `-` or `#`.
+///
+/// Multi-character operators like `+=` are represented as two instances of `Punct` with different
+/// forms of `Spacing` returned.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Clone)]
+pub struct Punct(bridge::Punct<bridge::client::Span>);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Punct {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Punct {}
+
+/// Describes whether a `Punct` is followed immediately by another `Punct` ([`Spacing::Joint`]) or
+/// by a different token or whitespace ([`Spacing::Alone`]).
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub enum Spacing {
+ /// A `Punct` is not immediately followed by another `Punct`.
+ /// E.g. `+` is `Alone` in `+ =`, `+ident` and `+()`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Alone,
+ /// A `Punct` is immediately followed by another `Punct`.
+ /// E.g. `+` is `Joint` in `+=` and `++`.
+ ///
+ /// Additionally, single quote `'` can join with identifiers to form lifetimes: `'ident`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Joint,
+}
+
+impl Punct {
+ /// Creates a new `Punct` from the given character and spacing.
+ /// The `ch` argument must be a valid punctuation character permitted by the language,
+ /// otherwise the function will panic.
+ ///
+ /// The returned `Punct` will have the default span of `Span::call_site()`
+ /// which can be further configured with the `set_span` method below.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(ch: char, spacing: Spacing) -> Punct {
+ const LEGAL_CHARS: &[char] = &[
+ '=', '<', '>', '!', '~', '+', '-', '*', '/', '%', '^', '&', '|', '@', '.', ',', ';',
+ ':', '#', '$', '?', '\'',
+ ];
+ if !LEGAL_CHARS.contains(&ch) {
+ panic!("unsupported character `{:?}`", ch);
+ }
+ Punct(bridge::Punct {
+ ch: ch as u8,
+ joint: spacing == Spacing::Joint,
+ span: Span::call_site().0,
+ })
+ }
+
+ /// Returns the value of this punctuation character as `char`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn as_char(&self) -> char {
+ self.0.ch as char
+ }
+
+ /// Returns the spacing of this punctuation character, indicating whether it's immediately
+ /// followed by another `Punct` in the token stream, so they can potentially be combined into
+ /// a multi-character operator (`Joint`), or it's followed by some other token or whitespace
+ /// (`Alone`) so the operator has certainly ended.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn spacing(&self) -> Spacing {
+ if self.0.joint { Spacing::Joint } else { Spacing::Alone }
+ }
+
+ /// Returns the span for this punctuation character.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configure the span for this punctuation character.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = span.0;
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Punct {
+ fn to_string(&self) -> String {
+ self.as_char().to_string()
+ }
+}
+
+/// Prints the punctuation character as a string that should be losslessly convertible
+/// back into the same character.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Punct {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}", self.as_char())
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Punct {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Punct")
+ .field("ch", &self.as_char())
+ .field("spacing", &self.spacing())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+#[stable(feature = "proc_macro_punct_eq", since = "1.50.0")]
+impl PartialEq<char> for Punct {
+ fn eq(&self, rhs: &char) -> bool {
+ self.as_char() == *rhs
+ }
+}
+
+#[stable(feature = "proc_macro_punct_eq_flipped", since = "1.52.0")]
+impl PartialEq<Punct> for char {
+ fn eq(&self, rhs: &Punct) -> bool {
+ *self == rhs.as_char()
+ }
+}
+
+/// An identifier (`ident`).
+#[derive(Clone)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Ident(bridge::Ident<bridge::client::Span, bridge::client::Symbol>);
+
+impl Ident {
+ /// Creates a new `Ident` with the given `string` as well as the specified
+ /// `span`.
+ /// The `string` argument must be a valid identifier permitted by the
+ /// language (including keywords, e.g. `self` or `fn`). Otherwise, the function will panic.
+ ///
+ /// Note that `span`, currently in rustc, configures the hygiene information
+ /// for this identifier.
+ ///
+ /// As of this time `Span::call_site()` explicitly opts-in to "call-site" hygiene
+ /// meaning that identifiers created with this span will be resolved as if they were written
+ /// directly at the location of the macro call, and other code at the macro call site will be
+ /// able to refer to them as well.
+ ///
+ /// Later spans like `Span::def_site()` will allow to opt-in to "definition-site" hygiene
+ /// meaning that identifiers created with this span will be resolved at the location of the
+ /// macro definition and other code at the macro call site will not be able to refer to them.
+ ///
+ /// Due to the current importance of hygiene this constructor, unlike other
+ /// tokens, requires a `Span` to be specified at construction.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(string: &str, span: Span) -> Ident {
+ Ident(bridge::Ident {
+ sym: bridge::client::Symbol::new_ident(string, false),
+ is_raw: false,
+ span: span.0,
+ })
+ }
+
+ /// Same as `Ident::new`, but creates a raw identifier (`r#ident`).
+ /// The `string` argument be a valid identifier permitted by the language
+ /// (including keywords, e.g. `fn`). Keywords which are usable in path segments
+ /// (e.g. `self`, `super`) are not supported, and will cause a panic.
+ #[stable(feature = "proc_macro_raw_ident", since = "1.47.0")]
+ pub fn new_raw(string: &str, span: Span) -> Ident {
+ Ident(bridge::Ident {
+ sym: bridge::client::Symbol::new_ident(string, true),
+ is_raw: true,
+ span: span.0,
+ })
+ }
+
+ /// Returns the span of this `Ident`, encompassing the entire string returned
+ /// by [`to_string`](ToString::to_string).
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configures the span of this `Ident`, possibly changing its hygiene context.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = span.0;
+ }
+}
+
+/// Converts the identifier to a string that should be losslessly convertible
+/// back into the same identifier.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Ident {
+ fn to_string(&self) -> String {
+ self.0.sym.with(|sym| if self.0.is_raw { ["r#", sym].concat() } else { sym.to_owned() })
+ }
+}
+
+/// Prints the identifier as a string that should be losslessly convertible back
+/// into the same identifier.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Ident {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if self.0.is_raw {
+ f.write_str("r#")?;
+ }
+ fmt::Display::fmt(&self.0.sym, f)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Ident {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Ident")
+ .field("ident", &self.to_string())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+/// A literal string (`"hello"`), byte string (`b"hello"`),
+/// character (`'a'`), byte character (`b'a'`), an integer or floating point number
+/// with or without a suffix (`1`, `1u8`, `2.3`, `2.3f32`).
+/// Boolean literals like `true` and `false` do not belong here, they are `Ident`s.
+#[derive(Clone)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Literal(bridge::Literal<bridge::client::Span, bridge::client::Symbol>);
+
+macro_rules! suffixed_int_literals {
+ ($($name:ident => $kind:ident,)*) => ($(
+ /// Creates a new suffixed integer literal with the specified value.
+ ///
+ /// This function will create an integer like `1u32` where the integer
+ /// value specified is the first part of the token and the integral is
+ /// also suffixed at the end.
+ /// Literals created from negative numbers might not survive round-trips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// Literals created through this method have the `Span::call_site()`
+ /// span by default, which can be configured with the `set_span` method
+ /// below.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::Literal {
+ kind: bridge::LitKind::Integer,
+ symbol: bridge::client::Symbol::new(&n.to_string()),
+ suffix: Some(bridge::client::Symbol::new(stringify!($kind))),
+ span: Span::call_site().0,
+ })
+ }
+ )*)
+}
+
+macro_rules! unsuffixed_int_literals {
+ ($($name:ident => $kind:ident,)*) => ($(
+ /// Creates a new unsuffixed integer literal with the specified value.
+ ///
+ /// This function will create an integer like `1` where the integer
+ /// value specified is the first part of the token. No suffix is
+ /// specified on this token, meaning that invocations like
+ /// `Literal::i8_unsuffixed(1)` are equivalent to
+ /// `Literal::u32_unsuffixed(1)`.
+ /// Literals created from negative numbers might not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// Literals created through this method have the `Span::call_site()`
+ /// span by default, which can be configured with the `set_span` method
+ /// below.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::Literal {
+ kind: bridge::LitKind::Integer,
+ symbol: bridge::client::Symbol::new(&n.to_string()),
+ suffix: None,
+ span: Span::call_site().0,
+ })
+ }
+ )*)
+}
+
+impl Literal {
+ fn new(kind: bridge::LitKind, value: &str, suffix: Option<&str>) -> Self {
+ Literal(bridge::Literal {
+ kind,
+ symbol: bridge::client::Symbol::new(value),
+ suffix: suffix.map(bridge::client::Symbol::new),
+ span: Span::call_site().0,
+ })
+ }
+
+ suffixed_int_literals! {
+ 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,
+ }
+
+ unsuffixed_int_literals! {
+ 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,
+ }
+
+ /// Creates a new unsuffixed floating-point literal.
+ ///
+ /// This constructor is similar to those like `Literal::i8_unsuffixed` where
+ /// the float's value is emitted directly into the token but no suffix is
+ /// used, so it may be inferred to be a `f64` later in the compiler.
+ /// Literals created from negative numbers might not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f32_unsuffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ let mut repr = n.to_string();
+ if !repr.contains('.') {
+ repr.push_str(".0");
+ }
+ Literal::new(bridge::LitKind::Float, &repr, None)
+ }
+
+ /// Creates a new suffixed floating-point literal.
+ ///
+ /// This constructor will create a literal like `1.0f32` where the value
+ /// specified is the preceding part of the token and `f32` is the suffix of
+ /// the token. This token will always be inferred to be an `f32` in the
+ /// compiler.
+ /// Literals created from negative numbers might not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f32_suffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ Literal::new(bridge::LitKind::Float, &n.to_string(), Some("f32"))
+ }
+
+ /// Creates a new unsuffixed floating-point literal.
+ ///
+ /// This constructor is similar to those like `Literal::i8_unsuffixed` where
+ /// the float's value is emitted directly into the token but no suffix is
+ /// used, so it may be inferred to be a `f64` later in the compiler.
+ /// Literals created from negative numbers might not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f64_unsuffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ let mut repr = n.to_string();
+ if !repr.contains('.') {
+ repr.push_str(".0");
+ }
+ Literal::new(bridge::LitKind::Float, &repr, None)
+ }
+
+ /// Creates a new suffixed floating-point literal.
+ ///
+ /// This constructor will create a literal like `1.0f64` where the value
+ /// specified is the preceding part of the token and `f64` is the suffix of
+ /// the token. This token will always be inferred to be an `f64` in the
+ /// compiler.
+ /// Literals created from negative numbers might not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f64_suffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ Literal::new(bridge::LitKind::Float, &n.to_string(), Some("f64"))
+ }
+
+ /// String literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn string(string: &str) -> Literal {
+ let quoted = format!("{:?}", string);
+ assert!(quoted.starts_with('"') && quoted.ends_with('"'));
+ let symbol = &quoted[1..quoted.len() - 1];
+ Literal::new(bridge::LitKind::Str, symbol, None)
+ }
+
+ /// Character literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn character(ch: char) -> Literal {
+ let quoted = format!("{:?}", ch);
+ assert!(quoted.starts_with('\'') && quoted.ends_with('\''));
+ let symbol = &quoted[1..quoted.len() - 1];
+ Literal::new(bridge::LitKind::Char, symbol, None)
+ }
+
+ /// Byte string literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn byte_string(bytes: &[u8]) -> Literal {
+ let string = bytes
+ .iter()
+ .cloned()
+ .flat_map(std::ascii::escape_default)
+ .map(Into::<char>::into)
+ .collect::<String>();
+ Literal::new(bridge::LitKind::ByteStr, &string, None)
+ }
+
+ /// Returns the span encompassing this literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configures the span associated for this literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = span.0;
+ }
+
+ /// Returns a `Span` that is a subset of `self.span()` containing only the
+ /// source bytes in range `range`. Returns `None` if the would-be trimmed
+ /// span is outside the bounds of `self`.
+ // FIXME(SergioBenitez): check that the byte range starts and ends at a
+ // UTF-8 boundary of the source. otherwise, it's likely that a panic will
+ // occur elsewhere when the source text is printed.
+ // FIXME(SergioBenitez): there is no way for the user to know what
+ // `self.span()` actually maps to, so this method can currently only be
+ // called blindly. For example, `to_string()` for the character 'c' returns
+ // "'\u{63}'"; there is no way for the user to know whether the source text
+ // was 'c' or whether it was '\u{63}'.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> {
+ self.0.span.subspan(range.start_bound().cloned(), range.end_bound().cloned()).map(Span)
+ }
+
+ fn with_symbol_and_suffix<R>(&self, f: impl FnOnce(&str, &str) -> R) -> R {
+ self.0.symbol.with(|symbol| match self.0.suffix {
+ Some(suffix) => suffix.with(|suffix| f(symbol, suffix)),
+ None => f(symbol, ""),
+ })
+ }
+
+ /// Invokes the callback with a `&[&str]` consisting of each part of the
+ /// literal's representation. This is done to allow the `ToString` and
+ /// `Display` implementations to borrow references to symbol values, and
+ /// both be optimized to reduce overhead.
+ fn with_stringify_parts<R>(&self, f: impl FnOnce(&[&str]) -> R) -> R {
+ /// Returns a string containing exactly `num` '#' characters.
+ /// Uses a 256-character source string literal which is always safe to
+ /// index with a `u8` index.
+ fn get_hashes_str(num: u8) -> &'static str {
+ const HASHES: &str = "\
+ ################################################################\
+ ################################################################\
+ ################################################################\
+ ################################################################\
+ ";
+ const _: () = assert!(HASHES.len() == 256);
+ &HASHES[..num as usize]
+ }
+
+ self.with_symbol_and_suffix(|symbol, suffix| match self.0.kind {
+ bridge::LitKind::Byte => f(&["b'", symbol, "'", suffix]),
+ bridge::LitKind::Char => f(&["'", symbol, "'", suffix]),
+ bridge::LitKind::Str => f(&["\"", symbol, "\"", suffix]),
+ bridge::LitKind::StrRaw(n) => {
+ let hashes = get_hashes_str(n);
+ f(&["r", hashes, "\"", symbol, "\"", hashes, suffix])
+ }
+ bridge::LitKind::ByteStr => f(&["b\"", symbol, "\"", suffix]),
+ bridge::LitKind::ByteStrRaw(n) => {
+ let hashes = get_hashes_str(n);
+ f(&["br", hashes, "\"", symbol, "\"", hashes, suffix])
+ }
+ _ => f(&[symbol, suffix]),
+ })
+ }
+}
+
+/// Parse a single literal from its stringified representation.
+///
+/// In order to parse successfully, the input string must not contain anything
+/// but the literal token. Specifically, it must not contain whitespace or
+/// comments in addition to the literal.
+///
+/// The resulting literal token will have a `Span::call_site()` span.
+///
+/// NOTE: some errors may cause panics instead of returning `LexError`. We
+/// reserve the right to change these errors into `LexError`s later.
+#[stable(feature = "proc_macro_literal_parse", since = "1.54.0")]
+impl FromStr for Literal {
+ type Err = LexError;
+
+ fn from_str(src: &str) -> Result<Self, LexError> {
+ match bridge::client::FreeFunctions::literal_from_str(src) {
+ Ok(literal) => Ok(Literal(literal)),
+ Err(()) => Err(LexError),
+ }
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Literal {
+ fn to_string(&self) -> String {
+ self.with_stringify_parts(|parts| parts.concat())
+ }
+}
+
+/// Prints the literal as a string that should be losslessly convertible
+/// back into the same literal (except for possible rounding for floating point literals).
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.with_stringify_parts(|parts| {
+ for part in parts {
+ fmt::Display::fmt(part, f)?;
+ }
+ Ok(())
+ })
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Literal")
+ // format the kind on one line even in {:#?} mode
+ .field("kind", &format_args!("{:?}", &self.0.kind))
+ .field("symbol", &self.0.symbol)
+ // format `Some("...")` on one line even in {:#?} mode
+ .field("suffix", &format_args!("{:?}", &self.0.suffix))
+ .field("span", &self.0.span)
+ .finish()
+ }
+}
+
+/// Tracked access to environment variables.
+#[unstable(feature = "proc_macro_tracked_env", issue = "99515")]
+pub mod tracked_env {
+ use std::env::{self, VarError};
+ use std::ffi::OsStr;
+
+ /// Retrieve an environment variable and add it to build dependency info.
+ /// Build system executing the compiler will know that the variable was accessed during
+ /// compilation, and will be able to rerun the build when the value of that variable changes.
+ /// Besides the dependency tracking this function should be equivalent to `env::var` from the
+ /// standard library, except that the argument must be UTF-8.
+ #[unstable(feature = "proc_macro_tracked_env", issue = "99515")]
+ pub fn var<K: AsRef<OsStr> + AsRef<str>>(key: K) -> Result<String, VarError> {
+ let key: &str = key.as_ref();
+ let value = env::var(key);
+ crate::bridge::client::FreeFunctions::track_env_var(key, value.as_deref().ok());
+ value
+ }
+}
+
+/// Tracked access to additional files.
+#[unstable(feature = "track_path", issue = "99515")]
+pub mod tracked_path {
+
+ /// Track a file explicitly.
+ ///
+ /// Commonly used for tracking asset preprocessing.
+ #[unstable(feature = "track_path", issue = "99515")]
+ pub fn path<P: AsRef<str>>(path: P) {
+ let path: &str = path.as_ref();
+ crate::bridge::client::FreeFunctions::track_path(path);
+ }
+}
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