A string interning library for Rust, developed as part of the Servo project.
In Cargo.toml:
[dependencies]
string_cache = "0.4"In lib.rs:
extern crate string_cache;
use string_cache::DefaultAtom as Atom;In Cargo.toml:
[package]
build = "build.rs"
[dependencies]
string_cache = "0.4"
[build-dependencies]
string_cache_codegen = "0.3"In build.rs:
extern crate string_cache_codegen;
use std::env;
use std::path::Path;
fn main() {
string_cache_codegen::AtomType::new("foo::FooAtom", "foo_atom!")
.atoms(&["foo", "bar"])
.write_to_file(&Path::new(&env::var("OUT_DIR").unwrap()).join("foo_atom.rs"))
.unwrap()
}In lib.rs:
extern crate string_cache;
mod foo {
include!(concat!(env!("OUT_DIR"), "/foo_atom.rs"));
}The generated code will define a FooAtom type and a foo_atom! macro.
The macro can be used in expression or patterns, with strings listed in build.rs.
For example:
fn compute_something(input: &foo::FooAtom) -> u32 {
match *input {
foo_atom!("foo") => 1,
foo_atom!("bar") => 2,
_ => 3,
}
}
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