Macros for all your token pasting needs ======================================= [github](https://github.com/dtolnay/paste) [crates.io](https://crates.io/crates/paste) [docs.rs](https://docs.rs/paste) [build status](https://github.com/dtolnay/paste/actions?query=branch%3Amaster) The nightly-only [`concat_idents!`] macro in the Rust standard library is notoriously underpowered in that its concatenated identifiers can only refer to existing items, they can never be used to define something new. [`concat_idents!`]: https://doc.rust-lang.org/std/macro.concat_idents.html This crate provides a flexible way to paste together identifiers in a macro, including using pasted identifiers to define new items. ```toml [dependencies] paste = "1.0" ``` This approach works with any Rust compiler 1.31+.
## Pasting identifiers Within the `paste!` macro, identifiers inside `[<`...`>]` are pasted together to form a single identifier. ```rust use paste::paste; paste! { // Defines a const called `QRST`. const []: &str = "success!"; } fn main() { assert_eq!( paste! { [].len() }, 8, ); } ```
## More elaborate example The next example shows a macro that generates accessor methods for some struct fields. It demonstrates how you might find it useful to bundle a paste invocation inside of a macro\_rules macro. ```rust use paste::paste; macro_rules! make_a_struct_and_getters { ($name:ident { $($field:ident),* }) => { // Define a struct. This expands to: // // pub struct S { // a: String, // b: String, // c: String, // } pub struct $name { $( $field: String, )* } // Build an impl block with getters. This expands to: // // impl S { // pub fn get_a(&self) -> &str { &self.a } // pub fn get_b(&self) -> &str { &self.b } // pub fn get_c(&self) -> &str { &self.c } // } paste! { impl $name { $( pub fn [](&self) -> &str { &self.$field } )* } } } } make_a_struct_and_getters!(S { a, b, c }); fn call_some_getters(s: &S) -> bool { s.get_a() == s.get_b() && s.get_c().is_empty() } ```
## Case conversion Use `$var:lower` or `$var:upper` in the segment list to convert an interpolated segment to lower- or uppercase as part of the paste. For example, `[]` would paste to `ld_bc_expr` if invoked with $reg=`Bc`. Use `$var:snake` to convert CamelCase input to snake\_case. Use `$var:camel` to convert snake\_case to CamelCase. These compose, so for example `$var:snake:upper` would give you SCREAMING\_CASE. The precise Unicode conversions are as defined by [`str::to_lowercase`] and [`str::to_uppercase`]. [`str::to_lowercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase [`str::to_uppercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_uppercase
## Pasting documentation strings Within the `paste!` macro, arguments to a #\[doc ...\] attribute are implicitly concatenated together to form a coherent documentation string. ```rust use paste::paste; macro_rules! method_new { ($ret:ident) => { paste! { #[doc = "Create a new `" $ret "` object."] pub fn new() -> $ret { todo!() } } }; } method_new!(Paste); // expands to #[doc = "Create a new `Paste` object"] ```
#### License Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.