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John Doty 2024-03-08 11:03:01 -08:00
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{"files":{"Cargo.toml":"7f8b4466da00825b1b13d102f8de7007f34684d0a74de0cb5bdc55a7eefe3144","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"62065228e42caebca7e7d7db1204cbb867033de5982ca4009928915e4095f3a3","lib.rs":"052b190a00c871e3ec62ed15b31e2fc7322e950a6de434018840389b97054a72"},"package":"6bb30289b722be4ff74a408c3cc27edeaad656e06cb1fe8fa9231fa59c728988"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
name = "string_cache_codegen"
version = "0.5.2"
authors = ["The Servo Project Developers"]
description = "A codegen library for string-cache, developed as part of the Servo project."
documentation = "https://docs.rs/string_cache_codegen/"
license = "MIT OR Apache-2.0"
repository = "https://github.com/servo/string-cache"
[lib]
name = "string_cache_codegen"
path = "lib.rs"
[dependencies.phf_generator]
version = "0.10"
[dependencies.phf_shared]
version = "0.10"
[dependencies.proc-macro2]
version = "1"
[dependencies.quote]
version = "1"

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Copyright (c) 2012-2013 Mozilla Foundation
Permission is hereby granted, free of charge, to any
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// Copyright 2016 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 crate to create static string caches at compiletime.
//!
//! # Examples
//!
//! With static atoms:
//!
//! In `Cargo.toml`:
//!
//! ```toml
//! [package]
//! build = "build.rs"
//!
//! [dependencies]
//! string_cache = "0.8"
//!
//! [build-dependencies]
//! string_cache_codegen = "0.5"
//! ```
//!
//! In `build.rs`:
//!
//! ```no_run
//! 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"));
//! }
//! ```
//!
//! 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:
//!
//! ```ignore
//! fn compute_something(input: &foo::FooAtom) -> u32 {
//! match *input {
//! foo_atom!("foo") => 1,
//! foo_atom!("bar") => 2,
//! _ => 3,
//! }
//! }
//! ```
//!
#![recursion_limit = "128"]
use quote::quote;
use std::collections::HashSet;
use std::fs::File;
use std::io::{self, BufWriter, Write};
use std::path::Path;
/// A builder for a static atom set and relevant macros
pub struct AtomType {
path: String,
atom_doc: Option<String>,
static_set_doc: Option<String>,
macro_name: String,
macro_doc: Option<String>,
atoms: HashSet<String>,
}
impl AtomType {
/// Constructs a new static atom set builder
///
/// `path` is a path within a crate of the atom type that will be created.
/// e.g. `"FooAtom"` at the crate root or `"foo::Atom"` if the generated code
/// is included in a `foo` module.
///
/// `macro_name` must end with `!`.
///
/// For example, `AtomType::new("foo::FooAtom", "foo_atom!")` will generate:
///
/// ```ignore
/// pub type FooAtom = ::string_cache::Atom<FooAtomStaticSet>;
/// pub struct FooAtomStaticSet;
/// impl ::string_cache::StaticAtomSet for FooAtomStaticSet {
/// // ...
/// }
/// #[macro_export]
/// macro_rules foo_atom {
/// // Expands to: $crate::foo::FooAtom { … }
/// }
/// ```
pub fn new(path: &str, macro_name: &str) -> Self {
assert!(macro_name.ends_with("!"), "`macro_name` must end with '!'");
AtomType {
path: path.to_owned(),
macro_name: macro_name[..macro_name.len() - "!".len()].to_owned(),
atom_doc: None,
static_set_doc: None,
macro_doc: None,
atoms: HashSet::new(),
}
}
/// Add some documentation to the generated Atom type alias.
///
/// This can help the user know that the type uses interned strings.
///
/// Note that `docs` should not contain the `///` at the front of normal docs.
pub fn with_atom_doc(&mut self, docs: &str) -> &mut Self {
self.atom_doc = Some(docs.to_owned());
self
}
/// Add some documentation to the generated static set.
///
/// This can help the user know that this type is zero-sized and just references a static
/// lookup table, or point them to the `Atom` type alias for more info.
///
/// Note that `docs` should not contain the `///` at the front of normal docs.
pub fn with_static_set_doc(&mut self, docs: &str) -> &mut Self {
self.static_set_doc = Some(docs.to_owned());
self
}
/// Add some documentation to the generated macro.
///
/// Note that `docs` should not contain the `///` at the front of normal docs.
pub fn with_macro_doc(&mut self, docs: &str) -> &mut Self {
self.macro_doc = Some(docs.to_owned());
self
}
/// Adds an atom to the builder
pub fn atom(&mut self, s: &str) -> &mut Self {
self.atoms.insert(s.to_owned());
self
}
/// Adds multiple atoms to the builder
pub fn atoms<I>(&mut self, iter: I) -> &mut Self
where
I: IntoIterator,
I::Item: AsRef<str>,
{
self.atoms
.extend(iter.into_iter().map(|s| s.as_ref().to_owned()));
self
}
/// Write generated code to `destination`.
pub fn write_to<W>(&mut self, mut destination: W) -> io::Result<()>
where
W: Write,
{
destination.write_all(
self.to_tokens()
.to_string()
// Insert some newlines to make the generated code slightly easier to read.
.replace(" [ \"", "[\n\"")
.replace("\" , ", "\",\n")
.replace(" ( \"", "\n( \"")
.replace("; ", ";\n")
.as_bytes(),
)
}
fn to_tokens(&mut self) -> proc_macro2::TokenStream {
// `impl Default for Atom` requires the empty string to be in the static set.
// This also makes sure the set in non-empty,
// which would cause divisions by zero in rust-phf.
self.atoms.insert(String::new());
let atoms: Vec<&str> = self.atoms.iter().map(|s| &**s).collect();
let hash_state = phf_generator::generate_hash(&atoms);
let phf_generator::HashState { key, disps, map } = hash_state;
let (disps0, disps1): (Vec<_>, Vec<_>) = disps.into_iter().unzip();
let atoms: Vec<&str> = map.iter().map(|&idx| atoms[idx]).collect();
let empty_string_index = atoms.iter().position(|s| s.is_empty()).unwrap() as u32;
let indices = 0..atoms.len() as u32;
let hashes: Vec<u32> = atoms
.iter()
.map(|string| {
let hash = phf_shared::hash(string, &key);
(hash.g ^ hash.f1) as u32
})
.collect();
let mut path_parts = self.path.rsplitn(2, "::");
let type_name = path_parts.next().unwrap();
let module = match path_parts.next() {
Some(m) => format!("$crate::{}", m),
None => format!("$crate"),
};
let atom_doc = match self.atom_doc {
Some(ref doc) => quote!(#[doc = #doc]),
None => quote!(),
};
let static_set_doc = match self.static_set_doc {
Some(ref doc) => quote!(#[doc = #doc]),
None => quote!(),
};
let macro_doc = match self.macro_doc {
Some(ref doc) => quote!(#[doc = #doc]),
None => quote!(),
};
let new_term =
|string: &str| proc_macro2::Ident::new(string, proc_macro2::Span::call_site());
let static_set_name = new_term(&format!("{}StaticSet", type_name));
let type_name = new_term(type_name);
let macro_name = new_term(&*self.macro_name);
let module = module.parse::<proc_macro2::TokenStream>().unwrap();
let atom_prefix = format!("ATOM_{}_", type_name.to_string().to_uppercase());
let const_names: Vec<_> = atoms
.iter()
.map(|atom| {
let mut name = atom_prefix.clone();
for c in atom.chars() {
name.push_str(&format!("_{:02X}", c as u32))
}
new_term(&name)
})
.collect();
quote! {
#atom_doc
pub type #type_name = ::string_cache::Atom<#static_set_name>;
#static_set_doc
#[derive(PartialEq, Eq, PartialOrd, Ord)]
pub struct #static_set_name;
impl ::string_cache::StaticAtomSet for #static_set_name {
fn get() -> &'static ::string_cache::PhfStrSet {
static SET: ::string_cache::PhfStrSet = ::string_cache::PhfStrSet {
key: #key,
disps: &[#((#disps0, #disps1)),*],
atoms: &[#(#atoms),*],
hashes: &[#(#hashes),*]
};
&SET
}
fn empty_string_index() -> u32 {
#empty_string_index
}
}
#(
pub const #const_names: #type_name = #type_name::pack_static(#indices);
)*
#macro_doc
#[macro_export]
macro_rules! #macro_name {
#(
(#atoms) => { #module::#const_names };
)*
}
}
}
/// Create a new file at `path` and write generated code there.
///
/// Typical usage:
/// `.write_to_file(&Path::new(&env::var("OUT_DIR").unwrap()).join("foo_atom.rs"))`
pub fn write_to_file(&mut self, path: &Path) -> io::Result<()> {
self.write_to(BufWriter::new(File::create(path)?))
}
}