1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

// Copyright 2014 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//!
//! A library for interning things that are `AsRef<str>`.
//!
//! Some strings may be interned at compile time using the `string-cache-codegen` crate, or the
//! `EmptyStaticAtomSet` may be used that has no compile-time interned strings. An `Atom` is an
//! interned string for a given set (either `EmptyStaticAtomSet` or a generated `StaticAtomSet`).
//!
//! Generated `Atom`s will have assocated macros to intern static strings at compile-time.
//!
//! # Examples
//!
//! Here are two examples, one with compile-time `Atom`s, and one without.
//!
//! ## With compile-time atoms
//!
//! In `Cargo.toml`:
//! ```toml
//! [dependencies]
//! string_cache = "0.7"
//!
//! [dev-dependencies]
//! string_cache_codegen = "0.4"
//! ```
//!
//! 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`:
//!
//! ```ignore
//! extern crate string_cache;
//!
//! mod foo {
//!     include!(concat!(env!("OUT_DIR"), "/foo_atom.rs"));
//! }
//!
//! fn use_the_atom(t: &str) {
//!     match *t {
//!         foo_atom!("foo") => println!("Found foo!"),
//!         foo_atom!("bar") => println!("Found bar!"),
//!         // foo_atom!("baz") => println!("Found baz!"), - would be a compile time error
//!         _ => {
//!             println!("String not interned");
//!             // We can intern strings at runtime as well
//!             foo::FooAtom::from(t)
//!         }
//!     }
//! }
//! ```
//!
//! ## No compile-time atoms
//!
//! ```
//! # extern crate string_cache;
//! use string_cache::DefaultAtom;
//!
//! # fn main() {
//! let mut interned_stuff = Vec::new();
//! let text = "here is a sentence of text that will be tokenised and
//!             interned and some repeated tokens is of text and";
//! for word in text.split_whitespace() {
//!     let seen_before = interned_stuff.iter()
//!         // We can use impl PartialEq<T> where T is anything string-like
//!         // to compare to interned strings to either other interned strings,
//!         // or actual strings  Comparing two interned strings is very fast
//!         // (normally a single cpu operation).
//!         .filter(|interned_word| interned_word == &word)
//!         .count();
//!     if seen_before > 0 {
//!         println!(r#"Seen the word "{}" {} times"#, word, seen_before);
//!     } else {
//!         println!(r#"Not seen the word "{}" before"#, word);
//!     }
//!     // We use the impl From<(Cow<'a, str>, or &'a str, or String)> for
//!     // Atom<Static> to intern a new string.
//!     interned_stuff.push(DefaultAtom::from(word));
//! }
//! # }
//! ```
//!

#![crate_name = "string_cache"]
#![crate_type = "rlib"]

#![cfg_attr(all(test, feature = "unstable"), feature(test))]

#[cfg(all(test, feature = "unstable"))] extern crate test;
#[cfg(all(test, feature = "unstable"))] extern crate rand;
#[macro_use] extern crate lazy_static;
#[macro_use] extern crate debug_unreachable;
extern crate phf_shared;
extern crate precomputed_hash;
extern crate serde;
extern crate string_cache_shared as shared;

pub use atom::{Atom, StaticAtomSet, PhfStrSet, EmptyStaticAtomSet, DefaultAtom};

#[cfg(feature = "log-events")]
#[macro_use]
pub mod event;

pub mod atom;

// Make test_atom! macro work in this crate.
// `$crate` would not be appropriate for other crates creating such macros
mod string_cache {
    pub use {Atom, StaticAtomSet, PhfStrSet};
}