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push_ident } push_ident_spanned }
push_lifetime Lifetime } push_lifetime_spanned }
push_punct } push_underscore } push_underscore_spanned } mk_ident } ident_maybe_raw } } } }
} } spanned Spanned __span
join_spans __quote __quote_spanned pounded_var_names pounded_var_names_with_context pounded_var_with_context quote_bind_into_iter quote_bind_next_or_break quote_each_token quote_each_token_spanned quote_tokens_with_context !quote_tokens_with_context_spanned quote_token_with_context quote_token_with_context_spanned quote_token quote_token_spanned ( ( ( ( ( ( (
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push_caret } push_caret_spanned }
push_caret_eq } push_caret_eq_spanned }
push_colon } push_colon_spanned } push_colon2 } push_colon2_spanned }
push_comma } push_comma_spanned } push_div } push_div_spanned } push_div_eq } push_div_eq_spanned } push_dot } push_dot_spanned } push_dot2 } push_dot2_spanned } push_dot3 } push_dot3_spanned } push_dot_dot_eq } push_dot_dot_eq_spanned } push_eq } push_eq_spanned }
push_eq_eq } push_eq_eq_spanned } push_ge } push_ge_spanned } push_gt } push_gt_spanned } push_le } push_le_spanned } push_lt } push_lt_spanned } push_mul_eq } push_mul_eq_spanned } push_ne } push_ne_spanned } push_or } push_or_spanned }
push_or_eq } push_or_eq_spanned }
push_or_or } push_or_or_spanned }
push_pound } push_pound_spanned }
push_question } push_question_spanned } push_rarrow } push_rarrow_spanned } push_larrow } push_larrow_spanned } push_rem } push_rem_spanned } push_rem_eq } push_rem_eq_spanned } push_fat_arrow } push_fat_arrow_spanned } push_semi } push_semi_spanned } push_shl } push_shl_spanned } push_shl_eq } push_shl_eq_spanned } push_shr } push_shr_spanned } push_shr_eq } push_shr_eq_spanned } push_star } push_star_spanned } push_sub } push_sub_spanned } push_sub_eq } push_sub_eq_spanned } IdentFragmentAdapter
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ߡjG f m - G & Y 1 G 8 ? v1 G ' R 2 G 9 @ %(A} , T d & ' t l . D! N ā ę !ij !̣ !! !Ľ " "\ " ,͉ 4l [![github]](https://github.com/dtolnay/quote) [![crates-io]](https://crates.io/crates/quote) [![docs-rs]](https://docs.rs/quote) g [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=githubj k [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rustn j [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rsm
D K This crate provides the [`quote!`] macro for turning Rust syntax tree dataN ' structures into tokens of source code.* [`quote!`]: macro.quote.html G Procedural macros in Rust receive a stream of tokens as input, executeJ M arbitrary Rust code to determine how to manipulate those tokens, and produceP M a stream of tokens to hand back to the compiler to compile into the caller'sP J crate. Quasi-quoting is a solution to one piece of that — producingM " tokens to return to the compiler.% K The idea of quasi-quoting is that we write *code* that we treat as *data*.N I Within the `quote!` macro, we can write what looks like code to our textL G editor or IDE. We get all the benefits of the editor's brace matching, J L syntax highlighting, indentation, and maybe autocompletion. But rather than O M compiling that as code into the current crate, we can treat it as data, pass
P L it around, mutate it, and eventually hand it back to the compiler as tokens
O * to compile into the macro caller's crate. - C This crate is motivated by the procedural macro use case, but is a F M general-purpose Rust quasi-quoting library and is not specific to procedural P macros.\
```toml\
[dependencies]
quote = "1.0"
```<
aD
# Examplel
L The following quasi-quoted block of code is something you might find in [a]O L procedural macro having to do with data structure serialization. The `#var`O K syntax performs interpolation of runtime variables into the quoted tokens.N J Check out the documentation of the [`quote!`] macro for more detail aboutM I the syntax. See also the [`quote_spanned!`] macro which is important forL ) implementing hygienic procedural macros., [a]: https://serde.rs/Խ - [`quote_spanned!`]: macro.quote_spanned.html0 l< # use quote::quote; #, # let generics = "";ij # let where_clause = ""; # let field_ty = ""; # let item_ty = ""; # let path = ""; # let value = ""; r, let tokens = quote! { 3 struct SerializeWith #generics #where_clause {6 value: &'a #field_ty,! 6 phantom: core::marker::PhantomData<#item_ty>,9 }L P impl #generics serde::Serialize for SerializeWith #generics #where_clause {S I fn serialize(&self, serializer: S) -> ResultL where " S: serde::Serializer,%
{l * #path(self.value, serializer)-
}l uL SerializeWith { value: #value, 8 phantom: core::marker::PhantomData::<#item_ty>,; uL };4 l< aD # Non-macro code generators L When using `quote` in a build.rs or main.rs and writing the output out to aO A file, consider having the code generator pass the tokens throughD L [prettyplease] before writing. This way if an error occurs in the generatedO 5 code it is convenient for a human to read and debug.8 8 [prettyplease]: https://github.com/dtolnay/prettyplease; l https://docs.rs/quote/1.0.36 7 %(A} # # # # & # ' # # . # N # # # # # # !# !# !# !# "# "# "# # 4# &&& & &< !D N $ ' \7 TokenTreeLD
|TTD)%;=$&) ? TokenStream extension trait with methods for appending tokens. QB M This trait is sealed and cannot be implemented outside of the `quote` crate. P t # | ӄ G ' For use by `ToTokens` implementations. * 4 Appends the token specified to this list of tokens. 74 7 7ل
K | ل$ token,57 b * l < 0 # use quote::{quote, TokenStreamExt, ToTokens}; 3 # use proc_macro2::TokenStream; # r ,
struct X; l impl ToTokens for X { ̠ 4 fn to_tokens(&self, tokens: &mut TokenStream) { 7 + tokens.append_all(&[true, false]); . u L } , let tokens = quote!(#X); . assert_eq!(tokens.to_string(), "true false"); 1 l <T 7 7ل
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҆ d D D ۓ$$ΐ$EG KM \ <#\ ! " 4 # # # ܒ CT 4 , Formatting macro for constructing `Ident`s. / 0 a D4 = # Syntax dA N L Syntax is copied from the [`format!`] macro, supporting both positional and RO named arguments. K Only a limited set of formatting traits are supported. The current mapping N of format types to traits is: ! * `{}` ⇒ [`IdentFragment`] ( * `{:o}` ⇒ [`Octal`](std::fmt::Octal) + . * `{:x}` ⇒ [`LowerHex`](std::fmt::LowerHex) 1 . * `{:X}` ⇒ [`UpperHex`](std::fmt::UpperHex) 1 * * `{:b}` ⇒ [`Binary`](std::fmt::Binary) - ' See [`std::fmt`] for more information. * a D # IdentFragment L Unlike `format!`, this macro uses the [`IdentFragment`] formatting trait by O ? default. This trait is like `Display`, with a few differences: B J * `IdentFragment` is only implemented for a limited set of types, such as M " unsigned integers and strings. % J * [`Ident`] arguments will have their `r#` prefixes stripped, if present. M ( [`IdentFragment`]: crate::IdentFragment + [`Ident`]: proc_macro2::Ident ! a D
# Hygiene l L The [`Span`] of the first `Ident` argument is used as the span of the final O H identifier, falling back to [`Span::call_site`] when no identifiers are K
provided. l l < # use quote::format_ident; & # let ident = format_ident!("Ident");
) M // If `ident` is an Ident, the span of `my_ident` will be inherited from it.
P 9 let my_ident = format_ident!("My{}{}", ident, "IsCool"); < ' assert_eq!(my_ident, "MyIdentIsCool"); * l < F Alternatively, the span can be overridden by passing the `span` named I
argument. l l < Σ 3 # const IGNORE_TOKENS: &'static str = stringify! { 6 let my_span = /* ... */;
# }; D
0 # let my_span = proc_macro2::Span::call_site();
3 * format_ident!("MyIdent", span = my_span); - l < [`Span`]: proc_macro2::Span 2 [`Span::call_site`]: proc_macro2::Span::call_site 5
| # Panics d H This method will panic if the resulting formatted string is not a valid K identifier. | a D # Examples t ' Composing raw and non-raw identifiers: * l < Σ / let my_ident = format_ident!("My{}", "Ident"); 2 ! assert_eq!(my_ident, "MyIdent"); $ " let raw = format_ident!("r#Raw"); % assert_eq!(raw, "r#Raw"); ; let my_ident_raw = format_ident!("{}Is{}", my_ident, raw); > * assert_eq!(my_ident_raw, "MyIdentIsRaw"); - l < Integer formatting options: l < Σ let num: u32 = 10; + let decimal = format_ident!("Id_{}", num); . assert_eq!(decimal, "Id_10"); ! + let octal = format_ident!("Id_{:o}", num); . assert_eq!(octal, "Id_12"); , let binary = format_ident!("Id_{:b}", num); / assert_eq!(binary, "Id_1010"); " / let lower_hex = format_ident!("Id_{:x}", num); 2 assert_eq!(lower_hex, "Id_a"); " / let upper_hex = format_ident!("Id_{:X}", num); 2 assert_eq!(upper_hex, "Id_A"); " l < d |Y $ , , L 4 $ $ rest $ , , L 4 $ $ d | 4 tZ % $ $ , L D
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ʁʺ Q> H $HMTM M \ M N M $M M ,M N println!("{}", #v), )*` — even multiple interpolations/H # / # aD/ # / # l0 # 0 # J Any interpolated tokens preserve the `Span` information provided by their0M # E `ToTokens` implementation. Tokens that originate within the `quote!`0H # 3 invocation are spanned with [`Span::call_site()`].16 # 2 # e [`Span::call_site()`]: https://docs.rs/proc-macro2/1.0/proc_macro2/struct.Span.html#method.call_site2h # 3 # G A different span can be provided through the [`quote_spanned!`] macro.3J # 3 # q30 # 4 # aD4 # 4 # # Return type4 # 4 # I The macro evaluates to an expression of type `proc_macro2::TokenStream`.4L # A Meanwhile Rust procedural macros are expected to return the type5D # `proc_macro::TokenStream`.6 # 6 # M The difference between the two types is that `proc_macro` types are entirely6P # I specific to procedural macros and cannot ever exist in code outside of a7L # I procedural macro, while `proc_macro2` types may exist anywhere including7L # I tests and non-macro code like main.rs and build.rs. This is why even the8L # J procedural macro ecosystem is largely built around `proc_macro2`, because9M # I that ensures the libraries are unit testable and accessible in non-macro9L #
contexts.l: # : # M There is a [`From`]-conversion in both directions so returning the output of:P # G `quote!` from a procedural macro usually looks like `tokens.into()` or;J # ) `proc_macro::TokenStream::from(tokens)`.<, # < # @ [`From`]: https://doc.rust-lang.org/std/convert/trait.From.html # L The structure of a basic procedural macro is as follows. Refer to the [Syn]>O # L crate for further useful guidance on using `quote!` as part of a procedural?O # macro.T? # ? # ?) # @ # l<@ # # #[cfg(any())]@ # extern crate proc_macro;@ # # extern crate proc_macro2;A # A # A # use proc_macro::TokenStream;A # A# # use quote::quote;B # B # B6 # #[proc_macro_derive(HeapSize)]C" # DC # = pub fn derive_heap_size(input: TokenStream) -> TokenStream {C@ # I // Parse the input and figure out what implementation to generate...DL # 7 # const IGNORE_TOKENS: &'static str = stringify! {D: # let name = /* ... */;E # let expr = /* ... */;E # # };dE # #LF # # let name = 0;F # # let expr = 0;F # F # let expanded = quote! {F # // The generated impl.G" # , impl heapsize::HeapSize for #name {G/ # 7 fn heap_size_of_children(&self) -> usize {G: # #expr̾H # H # xlH # };TI # I # 4 // Hand the output tokens back to the compiler.I7 # TokenStream::from(expanded)I# # ,J # l` then the expanded code is `Vec::new()` which is invalidgP # J syntax. Ordinarily in handwritten Rust we would write `Vec::::new()`hM # 7 but for macros often the following is more convenient.i: # i # l::new();j) # ,k # >::new()` which behaves correctly.k@ # l # 4 A similar pattern is appropriate for trait methods.l7 # l # l::default();nG # ,n # [`syn::Index`]: https://docs.rs/syn/2.0/syn/struct.Index.html{A # { # { # # let i = 0usize..self.fields.len();{& # | # J // expands to 0 + self.0usize.heap_size() + self.1usize.heap_size() + ...|M # // which is not valid syntax} # d} # " 0 #( + self.#i.heap_size() )*}% # ,} # l<~ # ~ # l<~ # ) # use proc_macro2::{Ident, TokenStream};~, # r~ # r, # # mod syn {| # / # use proc_macro2::{Literal, TokenStream};2 # - # use quote::{ToTokens, TokenStreamExt};0 # r, # # pub struct Index(usize);" # r,Ԁ # # # impl From for Index {& # & # fn from(i: usize) -> Self {) # # Index(i)Á # # }| # \ # r, # # impl ToTokens for Index {# # : # fn to_tokens(&self, tokens: &mut TokenStream) {̂= # @ # tokens.append(Literal::usize_unsuffixed(self.0));C # |ރ # \ # < # r, # # struct Struct { # # fields: Vec,Ƅ # < # r, # # impl Struct { # ) # fn example(&self) -> TokenStream {, # 6 let i = (0..self.fields.len()).map(syn::Index::from);ۅ9 # # @ // expands to 0 + self.0.heap_size() + self.1.heap_size() + ...C # d # % # , # \Ƈ # <ڇ # l< , 䝑 | ԑ 4 l ϑ $Б ֑ ّ b # L Same as `quote!`, but applies a given span to all tokens originating withinO # the macro invocation.̻ # ݒ # aD # # Ƙd # # M A span expression of type [`Span`], followed by `=>`, followed by the tokensP # I to quote. The span expression should be brief — use a variable forL # I anything more than a few characters. There should be no space before theՔL # `=>` token.| # # G [`Span`]: https://docs.rs/proc-macro2/1.0/proc_macro2/struct.Span.htmlΕJ # # l< # # use proc_macro2::Span;佖 # # use quote::quote_spanned; # r, # 6 # let span = /* ... */;ח # D # # let span = Span::call_site();# # # let init = 0; # Ҙ # ! // On one line, use parentheses.ޘ$ # D let tokens = quote_spanned!(span=> Box::into_raw(Box::new(#init)));G # ۙ # @ // On multiple lines, place the span at the top and use braces.C # $ let tokens = quote_spanned! {span=>' # # Box::into_raw(Box::new(#init))& # y4 # l< # # J The lack of space before the `=>` should look jarring to Rust programmersM # B and this is intentional. The formatting is designed to be visiblyE # J off-balance and draw the eye a particular way, due to the span expressionM # I being evaluated in the context of the procedural macro and the remainingL # . tokens being evaluated in the generated code.1 # ƞ # aDҞ # # l # # ԴM # M `ToTokens` implementation. Tokens that originate within the `quote_spanned!`P # 5 invocation are spanned with the given span argument.8 # # aD # # ml # # K The following procedural macro code uses `quote_spanned!` to assert that a̡N # M particular Rust type implements the [`Sync`] trait so that references can beP # safely shared between threads." # # ? [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.htmlB # # l< # 8 # use quote::{quote_spanned, TokenStreamExt, ToTokens};; # ( # use proc_macro2::{Span, TokenStream};ޤ+ # r, # # struct Type; # r, # # impl Type {ɥ # # fn span(&self) -> Span {" # # Span::call_site() # \ # <ʦ # r,ڦ # # impl ToTokens for Type { # 8 # fn to_tokens(&self, _tokens: &mut TokenStream) {}; # <ӧ # r, # # let ty = Type; # % # let call_site = Span::call_site();( # r, # let ty_span = ty.span();ͨ # , let assert_sync = quote_spanned! {ty_span=>/ # ( struct _AssertSync where #ty: Sync;+ # y4ީ # l< # # K If the assertion fails, the user will see an error like the following. 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