proc-macro-crate-1.3.1/.cargo_vcs_info.json0000644000000001360000000000100141740ustar { "git": { "sha1": "39716a71aa947ea6c038505cab720f1843689e07" }, "path_in_vcs": "" }proc-macro-crate-1.3.1/.github/workflows/rust.yml000064400000000000000000000004621046102023000201030ustar 00000000000000name: Rust on: push: branches: [ master ] pull_request: branches: [ master ] env: CARGO_TERM_COLOR: always jobs: test: name: cargo test runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - uses: dtolnay/rust-toolchain@1.60.0 - run: cargo test --all proc-macro-crate-1.3.1/.gitignore000064400000000000000000000000551046102023000147540ustar 00000000000000default.nix .envrc .direnv target Cargo.lock proc-macro-crate-1.3.1/.travis.yml000064400000000000000000000001041046102023000150700ustar 00000000000000language: rust cache: cargo rust: - stable - beta - nightly proc-macro-crate-1.3.1/Cargo.toml0000644000000022750000000000100122000ustar # 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 = "2021" rust-version = "1.60.0" name = "proc-macro-crate" version = "1.3.1" authors = ["Bastian Köcher "] description = """ Replacement for crate (macro_rules keyword) in proc-macros """ documentation = "https://docs.rs/proc-macro-crate" readme = "./README.md" keywords = [ "macro-rules", "crate", "macro", "proc-macro", ] categories = ["development-tools::procedural-macro-helpers"] license = "MIT OR Apache-2.0" repository = "https://github.com/bkchr/proc-macro-crate" [dependencies.once_cell] version = "1.13.0" [dependencies.toml_edit] version = "0.19" [dev-dependencies.proc-macro2] version = "1.0.18" [dev-dependencies.quote] version = "1.0.7" [dev-dependencies.syn] version = "1.0.33" proc-macro-crate-1.3.1/Cargo.toml.orig000064400000000000000000000011671046102023000156600ustar 00000000000000[package] name = "proc-macro-crate" version = "1.3.1" authors = ["Bastian Köcher "] edition = "2021" categories = ["development-tools::procedural-macro-helpers"] documentation = "https://docs.rs/proc-macro-crate" repository = "https://github.com/bkchr/proc-macro-crate" keywords = ["macro-rules", "crate", "macro", "proc-macro"] license = "MIT OR Apache-2.0" description = """ Replacement for crate (macro_rules keyword) in proc-macros """ readme = "./README.md" rust-version = "1.60.0" [dependencies] toml_edit = "0.19" once_cell = "1.13.0" [dev-dependencies] quote = "1.0.7" syn = "1.0.33" proc-macro2 = "1.0.18" proc-macro-crate-1.3.1/LICENSE-APACHE000064400000000000000000000251541046102023000147170ustar 00000000000000 Apache License Version 2.0, January 2004 https://www.apache.org/licenses/LICENSE-2.0 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. proc-macro-crate-1.3.1/README.md000064400000000000000000000056741046102023000142570ustar 00000000000000# proc-macro-crate [![](https://docs.rs/proc-macro-crate/badge.svg)](https://docs.rs/proc-macro-crate/) [![](https://img.shields.io/crates/v/proc-macro-crate.svg)](https://crates.io/crates/proc-macro-crate) [![](https://img.shields.io/crates/d/proc-macro-crate.png)](https://crates.io/crates/proc-macro-crate) [![Build Status](https://travis-ci.org/bkchr/proc-macro-crate.png?branch=master)](https://travis-ci.org/bkchr/proc-macro-crate) Providing support for `$crate` in procedural macros. * [Introduction](#introduction) * [Example](#example) * [License](#license) ### Introduction In `macro_rules!` `$crate` is used to get the path of the crate where a macro is declared in. In procedural macros there is currently no easy way to get this path. A common hack is to import the desired crate with a know name and use this. However, with rust edition 2018 and dropping `extern crate` declarations from `lib.rs`, people start to rename crates in `Cargo.toml` directly. However, this breaks importing the crate, as the proc-macro developer does not know the renamed name of the crate that should be imported. This crate provides a way to get the name of a crate, even if it renamed in `Cargo.toml`. For this purpose a single function `crate_name` is provided. This function needs to be called in the context of a proc-macro with the name of the desired crate. `CARGO_MANIFEST_DIR` will be used to find the current active `Cargo.toml` and this `Cargo.toml` is searched for the desired crate. ### Example ```rust use quote::quote; use syn::Ident; use proc_macro2::Span; use proc_macro_crate::{crate_name, FoundCrate}; fn import_my_crate() { let found_crate = crate_name("my-crate").expect("my-crate is present in `Cargo.toml`"); match found_crate { FoundCrate::Itself => quote!( crate::Something ), FoundCrate::Name(name) => { let ident = Ident::new(&name, Span::call_site()); quote!( #ident::Something ) } }; } ``` ### Edge cases There are multiple edge cases when it comes to determining the correct crate. If you for example import a crate as its own dependency, like this: ```toml [package] name = "my_crate" [dev-dependencies] my_crate = { version = "0.1", features = [ "test-feature" ] } ``` The crate will return `FoundCrate::Itself` and you will not be able to find the other instance of your crate in `dev-dependencies`. Other similar cases are when one crate is imported multiple times: ```toml [package] name = "my_crate" [dependencies] some-crate = { version = "0.5" } some-crate-old = { package = "some-crate", version = "0.1" } ``` When searching for `some-crate` in this `Cargo.toml` it will return `FoundCrate::Name("some_old_crate")`, aka the last definition of the crate in the `Cargo.toml`. ### License Licensed under either of * [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0) * [MIT license](https://opensource.org/licenses/MIT) at your option. License: MIT OR Apache-2.0 proc-macro-crate-1.3.1/src/lib.rs000064400000000000000000000317071046102023000146770ustar 00000000000000/*! [![](https://docs.rs/proc-macro-crate/badge.svg)](https://docs.rs/proc-macro-crate/) [![](https://img.shields.io/crates/v/proc-macro-crate.svg)](https://crates.io/crates/proc-macro-crate) [![](https://img.shields.io/crates/d/proc-macro-crate.png)](https://crates.io/crates/proc-macro-crate) [![Build Status](https://travis-ci.org/bkchr/proc-macro-crate.png?branch=master)](https://travis-ci.org/bkchr/proc-macro-crate) Providing support for `$crate` in procedural macros. * [Introduction](#introduction) * [Example](#example) * [License](#license) ## Introduction In `macro_rules!` `$crate` is used to get the path of the crate where a macro is declared in. In procedural macros there is currently no easy way to get this path. A common hack is to import the desired crate with a know name and use this. However, with rust edition 2018 and dropping `extern crate` declarations from `lib.rs`, people start to rename crates in `Cargo.toml` directly. However, this breaks importing the crate, as the proc-macro developer does not know the renamed name of the crate that should be imported. This crate provides a way to get the name of a crate, even if it renamed in `Cargo.toml`. For this purpose a single function `crate_name` is provided. This function needs to be called in the context of a proc-macro with the name of the desired crate. `CARGO_MANIFEST_DIR` will be used to find the current active `Cargo.toml` and this `Cargo.toml` is searched for the desired crate. ## Example ``` use quote::quote; use syn::Ident; use proc_macro2::Span; use proc_macro_crate::{crate_name, FoundCrate}; fn import_my_crate() { let found_crate = crate_name("my-crate").expect("my-crate is present in `Cargo.toml`"); match found_crate { FoundCrate::Itself => quote!( crate::Something ), FoundCrate::Name(name) => { let ident = Ident::new(&name, Span::call_site()); quote!( #ident::Something ) } }; } # fn main() {} ``` ## Edge cases There are multiple edge cases when it comes to determining the correct crate. If you for example import a crate as its own dependency, like this: ```toml [package] name = "my_crate" [dev-dependencies] my_crate = { version = "0.1", features = [ "test-feature" ] } ``` The crate will return `FoundCrate::Itself` and you will not be able to find the other instance of your crate in `dev-dependencies`. Other similar cases are when one crate is imported multiple times: ```toml [package] name = "my_crate" [dependencies] some-crate = { version = "0.5" } some-crate-old = { package = "some-crate", version = "0.1" } ``` When searching for `some-crate` in this `Cargo.toml` it will return `FoundCrate::Name("some_old_crate")`, aka the last definition of the crate in the `Cargo.toml`. ## License Licensed under either of * [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0) * [MIT license](https://opensource.org/licenses/MIT) at your option. */ use std::{ collections::btree_map::{self, BTreeMap}, env, fmt, fs, io, path::{Path, PathBuf}, sync::Mutex, time::SystemTime, }; use once_cell::sync::Lazy; use toml_edit::{Document, Item, Table, TomlError}; /// Error type used by this crate. #[derive(Debug)] pub enum Error { NotFound(PathBuf), CargoManifestDirNotSet, CouldNotRead { path: PathBuf, source: io::Error }, InvalidToml { source: TomlError }, CrateNotFound { crate_name: String, path: PathBuf }, } impl std::error::Error for Error { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { match self { Error::CouldNotRead { source, .. } => Some(source), Error::InvalidToml { source } => Some(source), _ => None, } } } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { Error::NotFound(path) => write!( f, "Could not find `Cargo.toml` in manifest dir: `{}`.", path.display() ), Error::CargoManifestDirNotSet => { f.write_str("`CARGO_MANIFEST_DIR` env variable not set.") } Error::CouldNotRead { path, .. } => write!(f, "Could not read `{}`.", path.display()), Error::InvalidToml { .. } => f.write_str("Invalid toml file."), Error::CrateNotFound { crate_name, path } => write!( f, "Could not find `{}` in `dependencies` or `dev-dependencies` in `{}`!", crate_name, path.display(), ), } } } /// The crate as found by [`crate_name`]. #[derive(Debug, PartialEq, Clone, Eq)] pub enum FoundCrate { /// The searched crate is this crate itself. Itself, /// The searched crate was found with this name. Name(String), } // In a rustc invocation, there will only ever be one entry in this map, since every crate is // compiled with its own rustc process. However, the same is not (currently) the case for // rust-analyzer. type Cache = BTreeMap; struct CacheEntry { manifest_ts: SystemTime, crate_names: CrateNames, } type CrateNames = BTreeMap; /// Find the crate name for the given `orig_name` in the current `Cargo.toml`. /// /// `orig_name` should be the original name of the searched crate. /// /// The current `Cargo.toml` is determined by taking `CARGO_MANIFEST_DIR/Cargo.toml`. /// /// # Returns /// /// - `Ok(orig_name)` if the crate was found, but not renamed in the `Cargo.toml`. /// - `Ok(RENAMED)` if the crate was found, but is renamed in the `Cargo.toml`. `RENAMED` will be /// the renamed name. /// - `Err` if an error occurred. /// /// The returned crate name is sanitized in such a way that it is a valid rust identifier. Thus, /// it is ready to be used in `extern crate` as identifier. pub fn crate_name(orig_name: &str) -> Result { let manifest_dir = env::var("CARGO_MANIFEST_DIR").map_err(|_| Error::CargoManifestDirNotSet)?; let manifest_path = Path::new(&manifest_dir).join("Cargo.toml"); let manifest_ts = cargo_toml_timestamp(&manifest_path)?; // This `Lazy>` can just be a `Mutex<_>` starting in Rust 1.63: // https://doc.rust-lang.org/beta/std/sync/struct.Mutex.html#method.new static CACHE: Lazy> = Lazy::new(Mutex::default); let mut cache = CACHE.lock().unwrap(); let crate_names = match cache.entry(manifest_dir) { btree_map::Entry::Occupied(entry) => { let cache_entry = entry.into_mut(); // Timestamp changed, rebuild this cache entry. if manifest_ts != cache_entry.manifest_ts { *cache_entry = read_cargo_toml(&manifest_path, manifest_ts)?; } &cache_entry.crate_names } btree_map::Entry::Vacant(entry) => { let cache_entry = entry.insert(read_cargo_toml(&manifest_path, manifest_ts)?); &cache_entry.crate_names } }; Ok(crate_names .get(orig_name) .ok_or_else(|| Error::CrateNotFound { crate_name: orig_name.to_owned(), path: manifest_path, })? .clone()) } fn cargo_toml_timestamp(manifest_path: &Path) -> Result { fs::metadata(manifest_path) .and_then(|meta| meta.modified()) .map_err(|source| { if source.kind() == io::ErrorKind::NotFound { Error::NotFound(manifest_path.to_owned()) } else { Error::CouldNotRead { path: manifest_path.to_owned(), source, } } }) } fn read_cargo_toml(manifest_path: &Path, manifest_ts: SystemTime) -> Result { let manifest = open_cargo_toml(manifest_path)?; let crate_names = extract_crate_names(&manifest)?; Ok(CacheEntry { manifest_ts, crate_names, }) } /// Make sure that the given crate name is a valid rust identifier. fn sanitize_crate_name>(name: S) -> String { name.as_ref().replace('-', "_") } /// Open the given `Cargo.toml` and parse it into a hashmap. fn open_cargo_toml(path: &Path) -> Result { let content = fs::read_to_string(path).map_err(|e| Error::CouldNotRead { source: e, path: path.into(), })?; content .parse::() .map_err(|e| Error::InvalidToml { source: e }) } /// Extract all crate names from the given `Cargo.toml` by checking the `dependencies` and /// `dev-dependencies`. fn extract_crate_names(cargo_toml: &Document) -> Result { let package_name = extract_package_name(cargo_toml); let root_pkg = package_name.as_ref().map(|name| { let cr = match env::var_os("CARGO_TARGET_TMPDIR") { // We're running for a library/binary crate None => FoundCrate::Itself, // We're running for an integration test Some(_) => FoundCrate::Name(sanitize_crate_name(name)), }; (name.to_string(), cr) }); let dep_tables = dep_tables(cargo_toml).chain(target_dep_tables(cargo_toml)); let dep_pkgs = dep_tables.flatten().filter_map(move |(dep_name, dep_value)| { let pkg_name = dep_value .get("package") .and_then(|i| i.as_str()) .unwrap_or(dep_name); if package_name.as_ref().map_or(false, |n| *n == pkg_name) { return None; } let cr = FoundCrate::Name(sanitize_crate_name(dep_name)); Some((pkg_name.to_owned(), cr)) }); Ok(root_pkg.into_iter().chain(dep_pkgs).collect()) } fn extract_package_name(cargo_toml: &Document) -> Option<&str> { cargo_toml.get("package")?.get("name")?.as_str() } fn target_dep_tables(cargo_toml: &Document) -> impl Iterator { cargo_toml .get("target") .into_iter() .filter_map(Item::as_table) .flat_map(|t| { t.iter() .map(|(_, value)| value) .filter_map(Item::as_table) .flat_map(dep_tables) }) } fn dep_tables(table: &Table) -> impl Iterator { table .get("dependencies") .into_iter() .chain(table.get("dev-dependencies")) .filter_map(Item::as_table) } #[cfg(test)] mod tests { use super::*; macro_rules! create_test { ( $name:ident, $cargo_toml:expr, $( $result:tt )* ) => { #[test] fn $name() { let cargo_toml = $cargo_toml.parse::().expect("Parses `Cargo.toml`"); match extract_crate_names(&cargo_toml).map(|mut map| map.remove("my_crate")) { $( $result )* => (), o => panic!("Invalid result: {:?}", o), } } }; } create_test! { deps_with_crate, r#" [dependencies] my_crate = "0.1" "#, Ok(Some(FoundCrate::Name(name))) if name == "my_crate" } create_test! { dev_deps_with_crate, r#" [dev-dependencies] my_crate = "0.1" "#, Ok(Some(FoundCrate::Name(name))) if name == "my_crate" } create_test! { deps_with_crate_renamed, r#" [dependencies] cool = { package = "my_crate", version = "0.1" } "#, Ok(Some(FoundCrate::Name(name))) if name == "cool" } create_test! { deps_with_crate_renamed_second, r#" [dependencies.cool] package = "my_crate" version = "0.1" "#, Ok(Some(FoundCrate::Name(name))) if name == "cool" } create_test! { deps_empty, r#" [dependencies] "#, Ok(None) } create_test! { crate_not_found, r#" [dependencies] serde = "1.0" "#, Ok(None) } create_test! { target_dependency, r#" [target.'cfg(target_os="android")'.dependencies] my_crate = "0.1" "#, Ok(Some(FoundCrate::Name(name))) if name == "my_crate" } create_test! { target_dependency2, r#" [target.x86_64-pc-windows-gnu.dependencies] my_crate = "0.1" "#, Ok(Some(FoundCrate::Name(name))) if name == "my_crate" } create_test! { own_crate, r#" [package] name = "my_crate" "#, Ok(Some(FoundCrate::Itself)) } create_test! { own_crate_and_in_deps, r#" [package] name = "my_crate" [dev-dependencies] my_crate = "0.1" "#, Ok(Some(FoundCrate::Itself)) } create_test! { multiple_times, r#" [dependencies] my_crate = { version = "0.5" } my-crate-old = { package = "my_crate", version = "0.1" } "#, Ok(Some(FoundCrate::Name(name))) if name == "my_crate_old" } }