blob: 8f0203b8e0812c920b815f4f3700c1b7fb57eb30 [file] [log] [blame]
//! This crate provides the [`quote!`] macro for turning Rust syntax tree data
//! structures into tokens of source code.
//!
//! [`quote!`]: macro.quote.html
//!
//! Procedural macros in Rust receive a stream of tokens as input, execute
//! arbitrary Rust code to determine how to manipulate those tokens, and produce
//! a stream of tokens to hand back to the compiler to compile into the caller's
//! crate. Quasi-quoting is a solution to one piece of that -- producing tokens
//! to return to the compiler.
//!
//! The idea of quasi-quoting is that we write *code* that we treat as *data*.
//! Within the `quote!` macro, we can write what looks like code to our text
//! editor or IDE. We get all the benefits of the editor's brace matching,
//! syntax highlighting, indentation, and maybe autocompletion. But rather than
//! compiling that as code into the current crate, we can treat it as data, pass
//! it around, mutate it, and eventually hand it back to the compiler as tokens
//! to compile into the macro caller's crate.
//!
//! This crate is motivated by the procedural macro use case, but is a
//! general-purpose Rust quasi-quoting library and is not specific to procedural
//! macros.
//!
//! *Version requirement: Quote supports any compiler version back to Rust's
//! very first support for procedural macros in Rust 1.15.0.*
//!
//! ```toml
//! [dependencies]
//! quote = "0.6"
//! ```
//!
//! ```
//! #[macro_use]
//! extern crate quote;
//! #
//! # fn main() {}
//! ```
//!
//! # Example
//!
//! The following quasi-quoted block of code is something you might find in [a]
//! procedural macro having to do with data structure serialization. The `#var`
//! syntax performs interpolation of runtime variables into the quoted tokens.
//! Check out the documentation of the [`quote!`] macro for more detail about
//! the syntax. See also the [`quote_spanned!`] macro which is important for
//! implementing hygienic procedural macros.
//!
//! [a]: https://serde.rs/
//! [`quote_spanned!`]: macro.quote_spanned.html
//!
//! ```
//! # #[macro_use]
//! # extern crate quote;
//! #
//! # fn main() {
//! # let generics = "";
//! # let where_clause = "";
//! # let field_ty = "";
//! # let item_ty = "";
//! # let path = "";
//! # let value = "";
//! #
//! let tokens = quote! {
//! struct SerializeWith #generics #where_clause {
//! value: &'a #field_ty,
//! phantom: ::std::marker::PhantomData<#item_ty>,
//! }
//!
//! impl #generics serde::Serialize for SerializeWith #generics #where_clause {
//! fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
//! where
//! S: serde::Serializer,
//! {
//! #path(self.value, serializer)
//! }
//! }
//!
//! SerializeWith {
//! value: #value,
//! phantom: ::std::marker::PhantomData::<#item_ty>,
//! }
//! };
//! #
//! # }
//! ```
//!
//! ## Recursion limit
//!
//! The `quote!` macro relies on deep recursion so some large invocations may
//! fail with "recursion limit reached" when you compile. If it fails, bump up
//! the recursion limit by adding `#![recursion_limit = "128"]` to your crate.
//! An even higher limit may be necessary for especially large invocations.
// Quote types in rustdoc of other crates get linked to here.
#![doc(html_root_url = "https://docs.rs/quote/0.6.10")]
#[cfg(all(
not(all(target_arch = "wasm32", target_os = "unknown")),
feature = "proc-macro"
))]
extern crate proc_macro;
extern crate proc_macro2;
mod ext;
pub use ext::TokenStreamExt;
mod to_tokens;
pub use to_tokens::ToTokens;
// Not public API.
#[doc(hidden)]
pub mod __rt {
use ext::TokenStreamExt;
pub use proc_macro2::*;
fn is_ident_start(c: u8) -> bool {
(b'a' <= c && c <= b'z') || (b'A' <= c && c <= b'Z') || c == b'_'
}
fn is_ident_continue(c: u8) -> bool {
(b'a' <= c && c <= b'z')
|| (b'A' <= c && c <= b'Z')
|| c == b'_'
|| (b'0' <= c && c <= b'9')
}
fn is_ident(token: &str) -> bool {
if token.bytes().all(|digit| digit >= b'0' && digit <= b'9') {
return false;
}
let mut bytes = token.bytes();
let first = bytes.next().unwrap();
if !is_ident_start(first) {
return false;
}
for ch in bytes {
if !is_ident_continue(ch) {
return false;
}
}
true
}
pub fn parse(tokens: &mut TokenStream, span: Span, s: &str) {
if is_ident(s) {
// Fast path, since idents are the most common token.
tokens.append(Ident::new(s, span));
} else {
let s: TokenStream = s.parse().expect("invalid token stream");
tokens.extend(s.into_iter().map(|mut t| {
t.set_span(span);
t
}));
}
}
macro_rules! push_punct {
($name:ident $char1:tt) => {
pub fn $name(tokens: &mut TokenStream, span: Span) {
let mut punct = Punct::new($char1, Spacing::Alone);
punct.set_span(span);
tokens.append(punct);
}
};
($name:ident $char1:tt $char2:tt) => {
pub fn $name(tokens: &mut TokenStream, span: Span) {
let mut punct = Punct::new($char1, Spacing::Joint);
punct.set_span(span);
tokens.append(punct);
let mut punct = Punct::new($char2, Spacing::Alone);
punct.set_span(span);
tokens.append(punct);
}
};
($name:ident $char1:tt $char2:tt $char3:tt) => {
pub fn $name(tokens: &mut TokenStream, span: Span) {
let mut punct = Punct::new($char1, Spacing::Joint);
punct.set_span(span);
tokens.append(punct);
let mut punct = Punct::new($char2, Spacing::Joint);
punct.set_span(span);
tokens.append(punct);
let mut punct = Punct::new($char3, Spacing::Alone);
punct.set_span(span);
tokens.append(punct);
}
};
}
push_punct!(push_add '+');
push_punct!(push_add_eq '+' '=');
push_punct!(push_and '&');
push_punct!(push_and_and '&' '&');
push_punct!(push_and_eq '&' '=');
push_punct!(push_at '@');
push_punct!(push_bang '!');
push_punct!(push_caret '^');
push_punct!(push_caret_eq '^' '=');
push_punct!(push_colon ':');
push_punct!(push_colon2 ':' ':');
push_punct!(push_comma ',');
push_punct!(push_div '/');
push_punct!(push_div_eq '/' '=');
push_punct!(push_dot '.');
push_punct!(push_dot2 '.' '.');
push_punct!(push_dot3 '.' '.' '.');
push_punct!(push_dot_dot_eq '.' '.' '=');
push_punct!(push_eq '=');
push_punct!(push_eq_eq '=' '=');
push_punct!(push_ge '>' '=');
push_punct!(push_gt '>');
push_punct!(push_le '<' '=');
push_punct!(push_lt '<');
push_punct!(push_mul_eq '*' '=');
push_punct!(push_ne '!' '=');
push_punct!(push_or '|');
push_punct!(push_or_eq '|' '=');
push_punct!(push_or_or '|' '|');
push_punct!(push_pound '#');
push_punct!(push_question '?');
push_punct!(push_rarrow '-' '>');
push_punct!(push_larrow '<' '-');
push_punct!(push_rem '%');
push_punct!(push_rem_eq '%' '=');
push_punct!(push_fat_arrow '=' '>');
push_punct!(push_semi ';');
push_punct!(push_shl '<' '<');
push_punct!(push_shl_eq '<' '<' '=');
push_punct!(push_shr '>' '>');
push_punct!(push_shr_eq '>' '>' '=');
push_punct!(push_star '*');
push_punct!(push_sub '-');
push_punct!(push_sub_eq '-' '=');
}
/// The whole point.
///
/// Performs variable interpolation against the input and produces it as
/// [`TokenStream`]. For returning tokens to the compiler in a procedural macro, use
/// `into()` to build a `TokenStream`.
///
/// [`TokenStream`]: https://docs.rs/proc-macro2/0.4/proc_macro2/struct.TokenStream.html
///
/// # Interpolation
///
/// Variable interpolation is done with `#var` (similar to `$var` in
/// `macro_rules!` macros). This grabs the `var` variable that is currently in
/// scope and inserts it in that location in the output tokens. Any type
/// implementing the [`ToTokens`] trait can be interpolated. This includes most
/// Rust primitive types as well as most of the syntax tree types from the [Syn]
/// crate.
///
/// [`ToTokens`]: trait.ToTokens.html
/// [Syn]: https://github.com/dtolnay/syn
///
/// Repetition is done using `#(...)*` or `#(...),*` again similar to
/// `macro_rules!`. This iterates through the elements of any variable
/// interpolated within the repetition and inserts a copy of the repetition body
/// for each one. The variables in an interpolation may be anything that
/// implements `IntoIterator`, including `Vec` or a pre-existing iterator.
///
/// - `#(#var)*` — no separators
/// - `#(#var),*` — the character before the asterisk is used as a separator
/// - `#( struct #var; )*` — the repetition can contain other tokens
/// - `#( #k => println!("{}", #v), )*` — even multiple interpolations
///
/// # Hygiene
///
/// Any interpolated tokens preserve the `Span` information provided by their
/// `ToTokens` implementation. Tokens that originate within the `quote!`
/// invocation are spanned with [`Span::call_site()`].
///
/// [`Span::call_site()`]: https://docs.rs/proc-macro2/0.4/proc_macro2/struct.Span.html#method.call_site
///
/// A different span can be provided through the [`quote_spanned!`] macro.
///
/// [`quote_spanned!`]: macro.quote_spanned.html
///
/// # Example
///
/// ```
/// # #[cfg(any())]
/// extern crate proc_macro;
/// # extern crate proc_macro2 as proc_macro;
///
/// #[macro_use]
/// extern crate quote;
///
/// use proc_macro::TokenStream;
///
/// # const IGNORE_TOKENS: &'static str = stringify! {
/// #[proc_macro_derive(HeapSize)]
/// # };
/// pub fn derive_heap_size(input: TokenStream) -> TokenStream {
/// // Parse the input and figure out what implementation to generate...
/// # const IGNORE_TOKENS: &'static str = stringify! {
/// let name = /* ... */;
/// let expr = /* ... */;
/// # };
/// #
/// # let name = 0;
/// # let expr = 0;
///
/// let expanded = quote! {
/// // The generated impl.
/// impl ::heapsize::HeapSize for #name {
/// fn heap_size_of_children(&self) -> usize {
/// #expr
/// }
/// }
/// };
///
/// // Hand the output tokens back to the compiler.
/// expanded.into()
/// }
/// #
/// # fn main() {}
/// ```
#[macro_export(local_inner_macros)]
macro_rules! quote {
($($tt:tt)*) => (quote_spanned!($crate::__rt::Span::call_site()=> $($tt)*));
}
/// Same as `quote!`, but applies a given span to all tokens originating within
/// the macro invocation.
///
/// # Syntax
///
/// A span expression of type [`Span`], followed by `=>`, followed by the tokens
/// to quote. The span expression should be brief -- use a variable for anything
/// more than a few characters. There should be no space before the `=>` token.
///
/// [`Span`]: https://docs.rs/proc-macro2/0.4/proc_macro2/struct.Span.html
///
/// ```
/// # #[macro_use]
/// # extern crate quote;
/// # extern crate proc_macro2;
/// #
/// # use proc_macro2::Span;
/// #
/// # fn main() {
/// # const IGNORE_TOKENS: &'static str = stringify! {
/// let span = /* ... */;
/// # };
/// # let span = Span::call_site();
/// # let init = 0;
///
/// // On one line, use parentheses.
/// let tokens = quote_spanned!(span=> Box::into_raw(Box::new(#init)));
///
/// // On multiple lines, place the span at the top and use braces.
/// let tokens = quote_spanned! {span=>
/// Box::into_raw(Box::new(#init))
/// };
/// # }
/// ```
///
/// The lack of space before the `=>` should look jarring to Rust programmers
/// and this is intentional. The formatting is designed to be visibly
/// off-balance and draw the eye a particular way, due to the span expression
/// being evaluated in the context of the procedural macro and the remaining
/// tokens being evaluated in the generated code.
///
/// # Hygiene
///
/// Any interpolated tokens preserve the `Span` information provided by their
/// `ToTokens` implementation. Tokens that originate within the `quote_spanned!`
/// invocation are spanned with the given span argument.
///
/// # Example
///
/// The following procedural macro code uses `quote_spanned!` to assert that a
/// particular Rust type implements the [`Sync`] trait so that references can be
/// safely shared between threads.
///
/// [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html
///
/// ```
/// # #[macro_use]
/// # extern crate quote;
/// # extern crate proc_macro2;
/// #
/// # use quote::{TokenStreamExt, ToTokens};
/// # use proc_macro2::{Span, TokenStream};
/// #
/// # struct Type;
/// #
/// # impl Type {
/// # fn span(&self) -> Span {
/// # Span::call_site()
/// # }
/// # }
/// #
/// # impl ToTokens for Type {
/// # fn to_tokens(&self, _tokens: &mut TokenStream) {}
/// # }
/// #
/// # fn main() {
/// # let ty = Type;
/// # let call_site = Span::call_site();
/// #
/// let ty_span = ty.span();
/// let assert_sync = quote_spanned! {ty_span=>
/// struct _AssertSync where #ty: Sync;
/// };
/// # }
/// ```
///
/// If the assertion fails, the user will see an error like the following. The
/// input span of their type is hightlighted in the error.
///
/// ```text
/// error[E0277]: the trait bound `*const (): std::marker::Sync` is not satisfied
/// --> src/main.rs:10:21
/// |
/// 10 | static ref PTR: *const () = &();
/// | ^^^^^^^^^ `*const ()` cannot be shared between threads safely
/// ```
///
/// In this example it is important for the where-clause to be spanned with the
/// line/column information of the user's input type so that error messages are
/// placed appropriately by the compiler. But it is also incredibly important
/// that `Sync` resolves at the macro definition site and not the macro call
/// site. If we resolve `Sync` at the same span that the user's type is going to
/// be resolved, then they could bypass our check by defining their own trait
/// named `Sync` that is implemented for their type.
#[macro_export(local_inner_macros)]
macro_rules! quote_spanned {
($span:expr=> $($tt:tt)*) => {
{
let mut _s = $crate::__rt::TokenStream::new();
let _span = $span;
quote_each_token!(_s _span $($tt)*);
_s
}
};
}
// Extract the names of all #metavariables and pass them to the $finish macro.
//
// in: pounded_var_names!(then () a #b c #( #d )* #e)
// out: then!(() b d e)
#[macro_export(local_inner_macros)]
#[doc(hidden)]
macro_rules! pounded_var_names {
($finish:ident ($($found:ident)*) # ( $($inner:tt)* ) $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) # [ $($inner:tt)* ] $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) # { $($inner:tt)* } $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) # $first:ident $($rest:tt)*) => {
pounded_var_names!($finish ($($found)* $first) $($rest)*)
};
($finish:ident ($($found:ident)*) ( $($inner:tt)* ) $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) [ $($inner:tt)* ] $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) { $($inner:tt)* } $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($inner)* $($rest)*)
};
($finish:ident ($($found:ident)*) $ignore:tt $($rest:tt)*) => {
pounded_var_names!($finish ($($found)*) $($rest)*)
};
($finish:ident ($($found:ident)*)) => {
$finish!(() $($found)*)
};
}
// in: nested_tuples_pat!(() a b c d e)
// out: ((((a b) c) d) e)
//
// in: nested_tuples_pat!(() a)
// out: a
#[macro_export(local_inner_macros)]
#[doc(hidden)]
macro_rules! nested_tuples_pat {
(()) => {
&()
};
(() $first:ident $($rest:ident)*) => {
nested_tuples_pat!(($first) $($rest)*)
};
(($pat:pat) $first:ident $($rest:ident)*) => {
nested_tuples_pat!((($pat, $first)) $($rest)*)
};
(($done:pat)) => {
$done
};
}
// in: multi_zip_expr!(() a b c d e)
// out: a.into_iter().zip(b).zip(c).zip(d).zip(e)
//
// in: multi_zip_iter!(() a)
// out: a
#[macro_export(local_inner_macros)]
#[doc(hidden)]
macro_rules! multi_zip_expr {
(()) => {
&[]
};
(() $single:ident) => {
$single
};
(() $first:ident $($rest:ident)*) => {
multi_zip_expr!(($first.into_iter()) $($rest)*)
};
(($zips:expr) $first:ident $($rest:ident)*) => {
multi_zip_expr!(($zips.zip($first)) $($rest)*)
};
(($done:expr)) => {
$done
};
}
#[macro_export(local_inner_macros)]
#[doc(hidden)]
macro_rules! quote_each_token {
($tokens:ident $span:ident) => {};
($tokens:ident $span:ident # ! $($rest:tt)*) => {
quote_each_token!($tokens $span #);
quote_each_token!($tokens $span !);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident # ( $($inner:tt)* ) * $($rest:tt)*) => {
for pounded_var_names!(nested_tuples_pat () $($inner)*)
in pounded_var_names!(multi_zip_expr () $($inner)*) {
quote_each_token!($tokens $span $($inner)*);
}
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident # ( $($inner:tt)* ) $sep:tt * $($rest:tt)*) => {
for (_i, pounded_var_names!(nested_tuples_pat () $($inner)*))
in pounded_var_names!(multi_zip_expr () $($inner)*).into_iter().enumerate() {
if _i > 0 {
quote_each_token!($tokens $span $sep);
}
quote_each_token!($tokens $span $($inner)*);
}
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident # [ $($inner:tt)* ] $($rest:tt)*) => {
quote_each_token!($tokens $span #);
$tokens.extend({
let mut g = $crate::__rt::Group::new(
$crate::__rt::Delimiter::Bracket,
quote_spanned!($span=> $($inner)*),
);
g.set_span($span);
Some($crate::__rt::TokenTree::from(g))
});
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident # $first:ident $($rest:tt)*) => {
$crate::ToTokens::to_tokens(&$first, &mut $tokens);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ( $($first:tt)* ) $($rest:tt)*) => {
$tokens.extend({
let mut g = $crate::__rt::Group::new(
$crate::__rt::Delimiter::Parenthesis,
quote_spanned!($span=> $($first)*),
);
g.set_span($span);
Some($crate::__rt::TokenTree::from(g))
});
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident [ $($first:tt)* ] $($rest:tt)*) => {
$tokens.extend({
let mut g = $crate::__rt::Group::new(
$crate::__rt::Delimiter::Bracket,
quote_spanned!($span=> $($first)*),
);
g.set_span($span);
Some($crate::__rt::TokenTree::from(g))
});
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident { $($first:tt)* } $($rest:tt)*) => {
$tokens.extend({
let mut g = $crate::__rt::Group::new(
$crate::__rt::Delimiter::Brace,
quote_spanned!($span=> $($first)*),
);
g.set_span($span);
Some($crate::__rt::TokenTree::from(g))
});
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident + $($rest:tt)*) => {
$crate::__rt::push_add(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident += $($rest:tt)*) => {
$crate::__rt::push_add_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident & $($rest:tt)*) => {
$crate::__rt::push_and(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident && $($rest:tt)*) => {
$crate::__rt::push_and_and(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident &= $($rest:tt)*) => {
$crate::__rt::push_and_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident @ $($rest:tt)*) => {
$crate::__rt::push_at(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ! $($rest:tt)*) => {
$crate::__rt::push_bang(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ^ $($rest:tt)*) => {
$crate::__rt::push_caret(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ^= $($rest:tt)*) => {
$crate::__rt::push_caret_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident : $($rest:tt)*) => {
$crate::__rt::push_colon(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident :: $($rest:tt)*) => {
$crate::__rt::push_colon2(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident , $($rest:tt)*) => {
$crate::__rt::push_comma(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident / $($rest:tt)*) => {
$crate::__rt::push_div(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident /= $($rest:tt)*) => {
$crate::__rt::push_div_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident . $($rest:tt)*) => {
$crate::__rt::push_dot(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident .. $($rest:tt)*) => {
$crate::__rt::push_dot2(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ... $($rest:tt)*) => {
$crate::__rt::push_dot3(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ..= $($rest:tt)*) => {
$crate::__rt::push_dot_dot_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident = $($rest:tt)*) => {
$crate::__rt::push_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident == $($rest:tt)*) => {
$crate::__rt::push_eq_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident >= $($rest:tt)*) => {
$crate::__rt::push_ge(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident > $($rest:tt)*) => {
$crate::__rt::push_gt(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident <= $($rest:tt)*) => {
$crate::__rt::push_le(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident < $($rest:tt)*) => {
$crate::__rt::push_lt(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident *= $($rest:tt)*) => {
$crate::__rt::push_mul_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident != $($rest:tt)*) => {
$crate::__rt::push_ne(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident | $($rest:tt)*) => {
$crate::__rt::push_or(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident |= $($rest:tt)*) => {
$crate::__rt::push_or_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident || $($rest:tt)*) => {
$crate::__rt::push_or_or(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident # $($rest:tt)*) => {
$crate::__rt::push_pound(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ? $($rest:tt)*) => {
$crate::__rt::push_question(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident -> $($rest:tt)*) => {
$crate::__rt::push_rarrow(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident <- $($rest:tt)*) => {
$crate::__rt::push_larrow(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident % $($rest:tt)*) => {
$crate::__rt::push_rem(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident %= $($rest:tt)*) => {
$crate::__rt::push_rem_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident => $($rest:tt)*) => {
$crate::__rt::push_fat_arrow(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident ; $($rest:tt)*) => {
$crate::__rt::push_semi(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident << $($rest:tt)*) => {
$crate::__rt::push_shl(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident <<= $($rest:tt)*) => {
$crate::__rt::push_shl_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident >> $($rest:tt)*) => {
$crate::__rt::push_shr(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident >>= $($rest:tt)*) => {
$crate::__rt::push_shr_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident * $($rest:tt)*) => {
$crate::__rt::push_star(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident - $($rest:tt)*) => {
$crate::__rt::push_sub(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident -= $($rest:tt)*) => {
$crate::__rt::push_sub_eq(&mut $tokens, $span);
quote_each_token!($tokens $span $($rest)*);
};
($tokens:ident $span:ident $first:tt $($rest:tt)*) => {
$crate::__rt::parse(&mut $tokens, $span, quote_stringify!($first));
quote_each_token!($tokens $span $($rest)*);
};
}
// Unhygienically invoke whatever `stringify` the caller has in scope i.e. not a
// local macro. The macros marked `local_inner_macros` above cannot invoke
// `stringify` directly.
#[macro_export]
#[doc(hidden)]
macro_rules! quote_stringify {
($tt:tt) => {
stringify!($tt)
};
}