diff options
Diffstat (limited to 'syn-mid')
| -rw-r--r-- | syn-mid/.editorconfig | 22 | ||||
| -rw-r--r-- | syn-mid/.gitignore | 6 | ||||
| -rw-r--r-- | syn-mid/.rustfmt.toml | 4 | ||||
| -rw-r--r-- | syn-mid/CHANGELOG.md | 33 | ||||
| -rw-r--r-- | syn-mid/Cargo.toml | 23 | ||||
| -rw-r--r-- | syn-mid/LICENSE-APACHE | 202 | ||||
| -rw-r--r-- | syn-mid/LICENSE-MIT | 23 | ||||
| -rw-r--r-- | syn-mid/README.md | 72 | ||||
| -rw-r--r-- | syn-mid/azure-pipelines.yml | 49 | ||||
| -rw-r--r-- | syn-mid/bors.toml | 1 | ||||
| -rw-r--r-- | syn-mid/ci/azure-clippy.yml | 31 | ||||
| -rw-r--r-- | syn-mid/ci/azure-install-rust.yml | 33 | ||||
| -rw-r--r-- | syn-mid/ci/azure-rustdoc.yml | 13 | ||||
| -rw-r--r-- | syn-mid/ci/azure-rustfmt.yml | 18 | ||||
| -rw-r--r-- | syn-mid/ci/azure-test.yml | 34 | ||||
| -rw-r--r-- | syn-mid/examples/const_fn/Cargo.toml | 16 | ||||
| -rw-r--r-- | syn-mid/examples/const_fn/lib.rs | 31 | ||||
| -rw-r--r-- | syn-mid/examples/const_fn_test/Cargo.toml | 9 | ||||
| -rw-r--r-- | syn-mid/examples/const_fn_test/build.rs | 16 | ||||
| -rw-r--r-- | syn-mid/examples/const_fn_test/tests/test.rs | 25 | ||||
| -rw-r--r-- | syn-mid/src/arg.rs | 99 | ||||
| -rw-r--r-- | syn-mid/src/lib.rs | 190 | ||||
| -rw-r--r-- | syn-mid/src/macros.rs | 107 | ||||
| -rw-r--r-- | syn-mid/src/pat.rs | 413 | ||||
| -rw-r--r-- | syn-mid/src/path.rs | 50 |
25 files changed, 1520 insertions, 0 deletions
diff --git a/syn-mid/.editorconfig b/syn-mid/.editorconfig new file mode 100644 index 0000000..920ea40 --- /dev/null +++ b/syn-mid/.editorconfig @@ -0,0 +1,22 @@ +# EditorConfig configuration +# http://EditorConfig.org + +# Top-most EditorConfig file +root = true + +# Unix-style newlines with a newline ending every file, utf-8 charset +[*] +end_of_line = lf +insert_final_newline = true +trim_trailing_whitespace = true +charset = utf-8 + +# Match rust/toml, set 4 space indentation +[*.{rs,toml}] +indent_style = space +indent_size = 4 + +# Match yaml/markdown, set 2 space indentation +[*.{yml,md}] +indent_style = space +indent_size = 2 diff --git a/syn-mid/.gitignore b/syn-mid/.gitignore new file mode 100644 index 0000000..2e6c307 --- /dev/null +++ b/syn-mid/.gitignore @@ -0,0 +1,6 @@ +.idea/ +.vscode/ +target/ +**/*.rs.bk +Cargo.lock +___* diff --git a/syn-mid/.rustfmt.toml b/syn-mid/.rustfmt.toml new file mode 100644 index 0000000..a27c0b7 --- /dev/null +++ b/syn-mid/.rustfmt.toml @@ -0,0 +1,4 @@ +# Set the default settings again to always apply the proper formatting without being affected by the editor settings. +# https://github.com/rust-lang/rls/issues/501#issuecomment-333717736 +edition = "2018" +tab_spaces = 4 diff --git a/syn-mid/CHANGELOG.md b/syn-mid/CHANGELOG.md new file mode 100644 index 0000000..25c17c1 --- /dev/null +++ b/syn-mid/CHANGELOG.md @@ -0,0 +1,33 @@ +# Unreleased + +# 0.4.0 - 2019-08-15 + +* Updated all data structures based on `syn` 1.0. + +* Updated `proc-macro2`, `syn`, and `quote` to 1.0. + +* Bumped the minimum required version from Rust 1.30 to Rust 1.31. + +# 0.3.0 - 2019-02-18 + +* Removed support for unneeded syntax. + +* Removed unneeded types and fields. + +* Implemented `Parse` for `Block`. + +* Changed `clone-impls` feature to "disabled by default". + +* Removed `extra-traits` feature. + +* Bumped the minimum required version from Rust 1.15 to Rust 1.30. + +# 0.2.0 - 2019-02-15 + +* Reduced features. + +* Fixed bugs. + +# 0.1.0 - 2019-02-14 + +Initial release diff --git a/syn-mid/Cargo.toml b/syn-mid/Cargo.toml new file mode 100644 index 0000000..f92e7a0 --- /dev/null +++ b/syn-mid/Cargo.toml @@ -0,0 +1,23 @@ +[package] +name = "syn-mid" +version = "0.4.0" +authors = ["Taiki Endo <te316e89@gmail.com>"] +edition = "2018" +license = "Apache-2.0/MIT" +repository = "https://github.com/taiki-e/syn-mid" +documentation = "https://docs.rs/syn-mid/" +readme = "README.md" +keywords = ["syn", "macros"] +categories = ["development-tools::procedural-macro-helpers"] +description = "Providing the features between \"full\" and \"derive\" of syn." + +[workspace] +members = ["examples/const_fn", "examples/const_fn_test"] + +[features] +clone-impls = ["syn/clone-impls"] + +[dependencies] +proc-macro2 = "1.0" +quote = "1.0" +syn = { version = "1.0", default-features = false, features = ["parsing", "printing", "derive"] } diff --git a/syn-mid/LICENSE-APACHE b/syn-mid/LICENSE-APACHE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/syn-mid/LICENSE-APACHE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + 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. diff --git a/syn-mid/README.md b/syn-mid/README.md new file mode 100644 index 0000000..b9b1c75 --- /dev/null +++ b/syn-mid/README.md @@ -0,0 +1,72 @@ +# syn-mid + +[![Build Status][azure-badge]][azure-url] +[![Crates.io][crates-version-badge]][crates-url] +[![Docs.rs][docs-badge]][docs-url] +[![License][crates-license-badge]][crates-url] +[![Minimum supported Rust version][rustc-badge]][rustc-url] + +[azure-badge]: https://dev.azure.com/taiki-e/taiki-e/_apis/build/status/taiki-e.syn-mid?branchName=master +[azure-url]: https://dev.azure.com/taiki-e/taiki-e/_build/latest?definitionId=11&branchName=master +[crates-version-badge]: https://img.shields.io/crates/v/syn-mid.svg +[crates-license-badge]: https://img.shields.io/crates/l/syn-mid.svg +[crates-badge]: https://img.shields.io/crates/v/syn-mid.svg +[crates-url]: https://crates.io/crates/syn-mid/ +[docs-badge]: https://docs.rs/syn-mid/badge.svg +[docs-url]: https://docs.rs/syn-mid/ +[rustc-badge]: https://img.shields.io/badge/rustc-1.31+-lightgray.svg +[rustc-url]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html + +Providing the features between "full" and "derive" of syn. + +This crate provides the following two unique data structures. + +* `syn_mid::ItemFn` -- A function whose body is not parsed. + + ```text + fn process(n: usize) -> Result<()> { ... } + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^ ^ + ``` + +* `syn_mid::Block` -- A block whose body is not parsed. + + ```text + { ... } + ^ ^ + ``` + +Other data structures are the same as data structures of [syn]. These are defined in this crate because they cannot be used in [syn] without "full" feature. + +[syn]: https://github.com/dtolnay/syn + +## Usage + +Add this to your `Cargo.toml`: + +```toml +[dependencies] +syn-mid = "0.4" +``` + +The current syn-mid requires Rust 1.31 or later. + +[**Examples**](examples) + +[**Documentation**](https://docs.rs/syn-mid/) + +## Optional features + +* **`clone-impls`** — Clone impls for all syntax tree types. + +## License + +Licensed under either of + +* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>) +* MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>) + +at your option. + +### Contribution + +Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions. diff --git a/syn-mid/azure-pipelines.yml b/syn-mid/azure-pipelines.yml new file mode 100644 index 0000000..6f0c968 --- /dev/null +++ b/syn-mid/azure-pipelines.yml @@ -0,0 +1,49 @@ +trigger: +- master +- staging +- trying + +variables: + RUSTFLAGS: -Dwarnings + +jobs: +# This is the minimum Rust version supported by syn-mid. +# When updating this, the reminder to update the minimum supported +# Rust version in README.md. +# +# Tests are not run as tests may require newer versions of rust. +- template: ci/azure-test.yml + parameters: + name: minrust + rust: 1.31.0 + +- template: ci/azure-test.yml + parameters: + name: stable + rust: stable + +- template: ci/azure-test.yml + parameters: + name: beta + rust: beta + +- template: ci/azure-test.yml + parameters: + name: nightly + rust: nightly + cmd: test + +- template: ci/azure-clippy.yml + parameters: + name: clippy + rust: nightly + +- template: ci/azure-rustfmt.yml + parameters: + name: rustfmt + rust: stable + +- template: ci/azure-rustdoc.yml + parameters: + name: rustdoc + rust: nightly diff --git a/syn-mid/bors.toml b/syn-mid/bors.toml new file mode 100644 index 0000000..b477894 --- /dev/null +++ b/syn-mid/bors.toml @@ -0,0 +1 @@ +status = ["taiki-e.syn-mid"] diff --git a/syn-mid/ci/azure-clippy.yml b/syn-mid/ci/azure-clippy.yml new file mode 100644 index 0000000..22165c6 --- /dev/null +++ b/syn-mid/ci/azure-clippy.yml @@ -0,0 +1,31 @@ +jobs: +- job: ${{ parameters.name }} + displayName: Clippy + pool: + vmImage: ubuntu-16.04 + + steps: + - template: azure-install-rust.yml + parameters: + rust: ${{ parameters.rust }} + + - script: | + set +e + if rustup component add clippy; then + set -e + else + set -e + target=`curl https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/clippy` + echo "'clippy' is unavailable on the toolchain '${{ parameters.rust }}', use the toolchain 'nightly-$target' instead" + rustup toolchain install nightly-$target + rustup default nightly-$target + rustup component add clippy + rustup toolchain list + rustc -Vv + cargo -V + fi + cargo clippy --version + displayName: rustup component add clippy + + - script: cargo clippy --all --all-features + displayName: cargo clippy --all-features diff --git a/syn-mid/ci/azure-install-rust.yml b/syn-mid/ci/azure-install-rust.yml new file mode 100644 index 0000000..6b008c6 --- /dev/null +++ b/syn-mid/ci/azure-install-rust.yml @@ -0,0 +1,33 @@ +steps: + # Linux and macOS. + - script: | + set -e + curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain none + export PATH=$PATH:$HOME/.cargo/bin + rustup toolchain install $RUSTUP_TOOLCHAIN + rustup default $RUSTUP_TOOLCHAIN + echo "##vso[task.setvariable variable=PATH;]$PATH:$HOME/.cargo/bin" + env: + RUSTUP_TOOLCHAIN: ${{ parameters.rust }} + displayName: Install rust (*nix) + condition: not(eq(variables['Agent.OS'], 'Windows_NT')) + + # Windows. + - script: | + curl -sSf -o rustup-init.exe https://win.rustup.rs + rustup-init.exe -y --default-toolchain none + set PATH=%PATH%;%USERPROFILE%\.cargo\bin + rustup toolchain install %RUSTUP_TOOLCHAIN% + rustup default %RUSTUP_TOOLCHAIN% + echo "##vso[task.setvariable variable=PATH;]%PATH%;%USERPROFILE%\.cargo\bin" + env: + RUSTUP_TOOLCHAIN: ${{ parameters.rust }} + displayName: Install rust (windows) + condition: eq(variables['Agent.OS'], 'Windows_NT') + + # All platforms. + - script: | + rustup toolchain list + rustc -Vv + cargo -V + displayName: Query rust and cargo versions diff --git a/syn-mid/ci/azure-rustdoc.yml b/syn-mid/ci/azure-rustdoc.yml new file mode 100644 index 0000000..99a43ff --- /dev/null +++ b/syn-mid/ci/azure-rustdoc.yml @@ -0,0 +1,13 @@ +jobs: +- job: ${{ parameters.name }} + displayName: Rustdoc + pool: + vmImage: ubuntu-16.04 + + steps: + - template: azure-install-rust.yml + parameters: + rust: ${{ parameters.rust }} + + - script: RUSTDOCFLAGS=-Dwarnings cargo doc --no-deps --all --all-features + displayName: cargo doc --all-features diff --git a/syn-mid/ci/azure-rustfmt.yml b/syn-mid/ci/azure-rustfmt.yml new file mode 100644 index 0000000..0b20da3 --- /dev/null +++ b/syn-mid/ci/azure-rustfmt.yml @@ -0,0 +1,18 @@ +jobs: +- job: ${{ parameters.name }} + displayName: Rustfmt + pool: + vmImage: ubuntu-16.04 + + steps: + - template: azure-install-rust.yml + parameters: + rust: ${{ parameters.rust }} + + - script: | + rustup component add rustfmt + cargo fmt --version + displayName: rustup component add rustfmt + + - script: cargo fmt --all -- --check + displayName: cargo fmt -- --check diff --git a/syn-mid/ci/azure-test.yml b/syn-mid/ci/azure-test.yml new file mode 100644 index 0000000..32a56ed --- /dev/null +++ b/syn-mid/ci/azure-test.yml @@ -0,0 +1,34 @@ +parameters: + cmd: check + +jobs: +- job: ${{ parameters.name }} + displayName: ${{ parameters.displayName }} ${{ parameters.rust }} + strategy: + matrix: + Linux: + vmImage: ubuntu-16.04 + + ${{ if parameters.cross }}: + MacOS: + vmImage: macOS-10.13 + Windows: + vmImage: vs2017-win2016 + pool: + vmImage: $(vmImage) + + steps: + - template: azure-install-rust.yml + parameters: + rust: ${{ parameters.rust }} + + - script: | + cargo ${{ parameters.cmd }} + cargo ${{ parameters.cmd }} --all-features + displayName: cargo ${{ parameters.cmd }} + + - ${{ if eq(parameters.rust, 'nightly') }}: + - script: | + cargo update -Zminimal-versions + cargo check --all-features + displayName: cargo check -Zminimal-versions diff --git a/syn-mid/examples/const_fn/Cargo.toml b/syn-mid/examples/const_fn/Cargo.toml new file mode 100644 index 0000000..d823e76 --- /dev/null +++ b/syn-mid/examples/const_fn/Cargo.toml @@ -0,0 +1,16 @@ +[package] +name = "const_fn" +version = "0.0.0" +authors = ["Taiki Endo <te316e89@gmail.com>"] +edition = "2018" +publish = false + +[lib] +proc-macro = true +path = "lib.rs" + +[dependencies] +proc-macro2 = "1.0" +quote = "1.0" +syn = "1.0" +syn-mid = { version = "0.4", path = "../..", features = ["clone-impls"] } diff --git a/syn-mid/examples/const_fn/lib.rs b/syn-mid/examples/const_fn/lib.rs new file mode 100644 index 0000000..29255f2 --- /dev/null +++ b/syn-mid/examples/const_fn/lib.rs @@ -0,0 +1,31 @@ +#![warn(rust_2018_idioms)] + +extern crate proc_macro; + +use proc_macro::TokenStream; +use proc_macro2::TokenStream as TokenStream2; +use quote::quote; +use syn_mid::ItemFn; + +/// An attribute for easy generation of a const function with conditional compilations. +#[proc_macro_attribute] +pub fn const_fn(args: TokenStream, function: TokenStream) -> TokenStream { + assert!(!args.is_empty(), "requires an argument"); + + let mut function = syn::parse_macro_input!(function as ItemFn); + let mut const_function = function.clone(); + + if function.constness.is_some() { + function.constness = None; + } else { + const_function.constness = Some(Default::default()); + } + + let args = TokenStream2::from(args); + TokenStream::from(quote! { + #[cfg(not(#args))] + #function + #[cfg(#args)] + #const_function + }) +} diff --git a/syn-mid/examples/const_fn_test/Cargo.toml b/syn-mid/examples/const_fn_test/Cargo.toml new file mode 100644 index 0000000..b3e2807 --- /dev/null +++ b/syn-mid/examples/const_fn_test/Cargo.toml @@ -0,0 +1,9 @@ +[package] +name = "const_fn_test" +version = "0.0.0" +authors = ["Taiki Endo <te316e89@gmail.com>"] +edition = "2018" +publish = false + +[dependencies] +const_fn = { path = "../const_fn" } diff --git a/syn-mid/examples/const_fn_test/build.rs b/syn-mid/examples/const_fn_test/build.rs new file mode 100644 index 0000000..bebf234 --- /dev/null +++ b/syn-mid/examples/const_fn_test/build.rs @@ -0,0 +1,16 @@ +use std::{env, process::Command}; + +fn main() { + println!("cargo:rerun-if-changed=build.rs"); + + if is_nightly() { + println!("cargo:rustc-cfg=nightly"); + } +} + +fn is_nightly() -> bool { + env::var_os("RUSTC") + .and_then(|rustc| Command::new(rustc).arg("--version").output().ok()) + .and_then(|output| String::from_utf8(output.stdout).ok()) + .map_or(false, |version| version.contains("nightly")) +} diff --git a/syn-mid/examples/const_fn_test/tests/test.rs b/syn-mid/examples/const_fn_test/tests/test.rs new file mode 100644 index 0000000..1b2c742 --- /dev/null +++ b/syn-mid/examples/const_fn_test/tests/test.rs @@ -0,0 +1,25 @@ +#![cfg_attr(nightly, feature(const_fn, const_vec_new))] +#![warn(rust_2018_idioms)] +#![allow(dead_code)] + +use const_fn::const_fn; + +#[const_fn(nightly)] +fn const_vec_new<T>() -> Vec<T> { + let vec = Vec::new(); + vec +} + +#[test] +fn test_stable() { + assert_eq!(const_vec_new::<u8>(), Vec::new()); +} + +#[cfg(nightly)] +const CONST_UNSTABLE: Vec<u8> = const_vec_new(); + +#[cfg(nightly)] +#[test] +fn test_unstable() { + assert_eq!(CONST_UNSTABLE, Vec::new()); +} diff --git a/syn-mid/src/arg.rs b/syn-mid/src/arg.rs new file mode 100644 index 0000000..593a1ac --- /dev/null +++ b/syn-mid/src/arg.rs @@ -0,0 +1,99 @@ +use syn::{Attribute, Lifetime, Token}; + +use super::PatType; + +ast_enum_of_structs! { + /// An argument in a function signature: the `n: usize` in `fn f(n: usize)`. + pub enum FnArg { + /// The `self` argument of an associated method, whether taken by value + /// or by reference. + Receiver(Receiver), + + /// A function argument accepted by pattern and type. + Typed(PatType), + } +} + +ast_struct! { + /// The `self` argument of an associated method, whether taken by value + /// or by reference. + pub struct Receiver { + pub attrs: Vec<Attribute>, + pub reference: Option<(Token![&], Option<Lifetime>)>, + pub mutability: Option<Token![mut]>, + pub self_token: Token![self], + } +} + +mod parsing { + use syn::{ + parse::{discouraged::Speculative, Parse, ParseStream, Result}, + Attribute, Token, + }; + + use super::{FnArg, PatType, Receiver}; + + impl Parse for FnArg { + fn parse(input: ParseStream<'_>) -> Result<Self> { + let attrs = input.call(Attribute::parse_outer)?; + + let ahead = input.fork(); + if let Ok(mut receiver) = ahead.parse::<Receiver>() { + if !ahead.peek(Token![:]) { + input.advance_to(&ahead); + receiver.attrs = attrs; + return Ok(FnArg::Receiver(receiver)); + } + } + + let mut typed = input.call(fn_arg_typed)?; + typed.attrs = attrs; + Ok(FnArg::Typed(typed)) + } + } + + impl Parse for Receiver { + fn parse(input: ParseStream<'_>) -> Result<Self> { + Ok(Self { + attrs: Vec::new(), + reference: { + if input.peek(Token![&]) { + Some((input.parse()?, input.parse()?)) + } else { + None + } + }, + mutability: input.parse()?, + self_token: input.parse()?, + }) + } + } + + fn fn_arg_typed(input: ParseStream<'_>) -> Result<PatType> { + Ok(PatType { + attrs: Vec::new(), + pat: input.parse()?, + colon_token: input.parse()?, + ty: Box::new(input.parse()?), + }) + } +} + +mod printing { + use proc_macro2::TokenStream; + use quote::{ToTokens, TokenStreamExt}; + + use super::Receiver; + + impl ToTokens for Receiver { + fn to_tokens(&self, tokens: &mut TokenStream) { + tokens.append_all(&self.attrs); + if let Some((ampersand, lifetime)) = &self.reference { + ampersand.to_tokens(tokens); + lifetime.to_tokens(tokens); + } + self.mutability.to_tokens(tokens); + self.self_token.to_tokens(tokens); + } + } +} diff --git a/syn-mid/src/lib.rs b/syn-mid/src/lib.rs new file mode 100644 index 0000000..69bdec9 --- /dev/null +++ b/syn-mid/src/lib.rs @@ -0,0 +1,190 @@ +//! Providing the features between "full" and "derive" of syn. +//! +//! This crate provides the following two unique data structures. +//! +//! * [`syn_mid::ItemFn`] -- A function whose body is not parsed. +//! +//! ```text +//! fn process(n: usize) -> Result<()> { ... } +//! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^ ^ +//! ``` +//! +//! * [`syn_mid::Block`] -- A block whose body is not parsed. +//! +//! ```text +//! { ... } +//! ^ ^ +//! ``` +//! +//! Other data structures are the same as data structures of [syn]. These are defined in this crate +//! because they cannot be used in [syn] without "full" feature. +//! +//! ## Optional features +//! +//! syn-mid in the default features aims to provide the features between "full" +//! and "derive" of [syn]. +//! +//! * **`clone-impls`** — Clone impls for all syntax tree types. +//! +//! [`syn_mid::ItemFn`]: struct.ItemFn.html +//! [`syn_mid::Block`]: struct.Block.html +//! [syn]: https://github.com/dtolnay/syn +//! + +#![doc(html_root_url = "https://docs.rs/syn-mid/0.4.0")] +#![doc(test(attr(deny(warnings), allow(dead_code, unused_assignments, unused_variables))))] +#![warn(unsafe_code)] +#![warn(rust_2018_idioms, unreachable_pub)] +#![warn(single_use_lifetimes)] +#![warn(clippy::all, clippy::pedantic)] +#![allow( + clippy::eval_order_dependence, + clippy::large_enum_variant, + clippy::module_name_repetitions, + clippy::use_self +)] + +// Many of the code contained in this crate are copies from https://github.com/dtolnay/syn. + +#[macro_use] +mod macros; + +mod arg; +mod pat; +mod path; + +pub use self::arg::*; +pub use self::pat::*; + +use proc_macro2::TokenStream; +use syn::{ + punctuated::Punctuated, token, Abi, Attribute, Generics, Ident, ReturnType, Token, Visibility, +}; + +ast_struct! { + /// A braced block containing Rust statements. + pub struct Block { + pub brace_token: token::Brace, + /// Statements in a block + pub stmts: TokenStream, + } +} + +ast_struct! { + /// A free-standing function: `fn process(n: usize) -> Result<()> { ... + /// }`. + pub struct ItemFn { + pub attrs: Vec<Attribute>, + pub vis: Visibility, + pub constness: Option<Token![const]>, + pub asyncness: Option<Token![async]>, + pub unsafety: Option<Token![unsafe]>, + pub abi: Option<Abi>, + pub fn_token: Token![fn], + pub ident: Ident, + pub generics: Generics, + pub paren_token: token::Paren, + pub inputs: Punctuated<FnArg, Token![,]>, + pub output: ReturnType, + pub block: Block, + } +} + +mod parsing { + use syn::{ + braced, parenthesized, + parse::{Parse, ParseStream, Result}, + Abi, Attribute, Generics, Ident, ReturnType, Token, Visibility, WhereClause, + }; + + use super::{Block, FnArg, ItemFn}; + + impl Parse for Block { + fn parse(input: ParseStream<'_>) -> Result<Self> { + let content; + Ok(Self { + brace_token: braced!(content in input), + stmts: content.parse()?, + }) + } + } + + impl Parse for ItemFn { + fn parse(input: ParseStream<'_>) -> Result<Self> { + let attrs = input.call(Attribute::parse_outer)?; + let vis: Visibility = input.parse()?; + let constness: Option<Token![const]> = input.parse()?; + let asyncness: Option<Token![async]> = input.parse()?; + let unsafety: Option<Token![unsafe]> = input.parse()?; + let abi: Option<Abi> = input.parse()?; + let fn_token: Token![fn] = input.parse()?; + let ident: Ident = input.parse()?; + let generics: Generics = input.parse()?; + + let content; + let paren_token = parenthesized!(content in input); + let inputs = content.parse_terminated(FnArg::parse)?; + + let output: ReturnType = input.parse()?; + let where_clause: Option<WhereClause> = input.parse()?; + + let block = input.parse()?; + + Ok(Self { + attrs, + vis, + constness, + asyncness, + unsafety, + abi, + fn_token, + ident, + generics: Generics { + where_clause, + ..generics + }, + paren_token, + inputs, + output, + block, + }) + } + } +} + +mod printing { + use proc_macro2::TokenStream; + use quote::{ToTokens, TokenStreamExt}; + + use super::{Block, ItemFn}; + + impl ToTokens for Block { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.brace_token.surround(tokens, |tokens| { + tokens.append_all(self.stmts.clone()); + }); + } + } + + impl ToTokens for ItemFn { + fn to_tokens(&self, tokens: &mut TokenStream) { + tokens.append_all(&self.attrs); + self.vis.to_tokens(tokens); + self.constness.to_tokens(tokens); + self.asyncness.to_tokens(tokens); + self.unsafety.to_tokens(tokens); + self.abi.to_tokens(tokens); + self.fn_token.to_tokens(tokens); + self.ident.to_tokens(tokens); + self.generics.to_tokens(tokens); + self.paren_token.surround(tokens, |tokens| { + self.inputs.to_tokens(tokens); + }); + self.output.to_tokens(tokens); + self.generics.where_clause.to_tokens(tokens); + self.block.brace_token.surround(tokens, |tokens| { + tokens.append_all(self.block.stmts.clone()); + }); + } + } +} diff --git a/syn-mid/src/macros.rs b/syn-mid/src/macros.rs new file mode 100644 index 0000000..87be7b4 --- /dev/null +++ b/syn-mid/src/macros.rs @@ -0,0 +1,107 @@ +macro_rules! ast_struct { + ( + [$($attrs_pub:tt)*] + struct $name:ident $($rest:tt)* + ) => { + #[cfg_attr(feature = "clone-impls", derive(Clone))] + $($attrs_pub)* struct $name $($rest)* + }; + + ($($t:tt)*) => { + strip_attrs_pub!(ast_struct!($($t)*)); + }; +} + +macro_rules! ast_enum { + ( + [$($attrs_pub:tt)*] + enum $name:ident $($rest:tt)* + ) => ( + #[cfg_attr(feature = "clone-impls", derive(Clone))] + $($attrs_pub)* enum $name $($rest)* + ); + + ($($t:tt)*) => { + strip_attrs_pub!(ast_enum!($($t)*)); + }; +} + +macro_rules! ast_enum_of_structs { + ( + $(#[$enum_attr:meta])* + $pub:ident $enum:ident $name:ident $body:tt + ) => { + ast_enum!($(#[$enum_attr])* $pub $enum $name $body); + ast_enum_of_structs_impl!($pub $enum $name $body); + }; +} + +macro_rules! ast_enum_of_structs_impl { + ( + $pub:ident $enum:ident $name:ident { + $( + $(#[$variant_attr:meta])* + $variant:ident $( ($member:ident) )*, + )* + } + ) => { + check_keyword_matches!(pub $pub); + check_keyword_matches!(enum $enum); + + $( + $( + impl From<$member> for $name { + fn from(e: $member) -> $name { + $name::$variant(e) + } + } + )* + )* + + generate_to_tokens! { + () + tokens + $name { $($variant $($member)*,)* } + } + }; +} + +macro_rules! generate_to_tokens { + (($($arms:tt)*) $tokens:ident $name:ident { $variant:ident, $($next:tt)*}) => { + generate_to_tokens!( + ($($arms)* $name::$variant => {}) + $tokens $name { $($next)* } + ); + }; + + (($($arms:tt)*) $tokens:ident $name:ident { $variant:ident $member:ident, $($next:tt)*}) => { + generate_to_tokens!( + ($($arms)* $name::$variant(_e) => quote::ToTokens::to_tokens(_e, $tokens),) + $tokens $name { $($next)* } + ); + }; + + (($($arms:tt)*) $tokens:ident $name:ident {}) => { + impl quote::ToTokens for $name { + fn to_tokens(&self, $tokens: &mut proc_macro2::TokenStream) { + match self { + $($arms)* + } + } + } + }; +} + +macro_rules! strip_attrs_pub { + ($mac:ident!($(#[$m:meta])* $pub:ident $($t:tt)*)) => { + check_keyword_matches!(pub $pub); + + $mac!([$(#[$m])* $pub] $($t)*); + }; +} + +macro_rules! check_keyword_matches { + (struct struct) => {}; + (enum enum) => {}; + (pub pub) => {}; +} diff --git a/syn-mid/src/pat.rs b/syn-mid/src/pat.rs new file mode 100644 index 0000000..8f95381 --- /dev/null +++ b/syn-mid/src/pat.rs @@ -0,0 +1,413 @@ +use syn::{punctuated::Punctuated, token, Attribute, Ident, Member, Path, Token, Type}; + +ast_enum_of_structs! { + /// A pattern in a local binding, function signature, match expression, or + /// various other places. + /// + /// # Syntax tree enum + /// + /// This type is a [syntax tree enum]. + /// + /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums + pub enum Pat { + /// A pattern that binds a new variable: `ref mut binding @ SUBPATTERN`. + Ident(PatIdent), + + /// A path pattern like `Color::Red`. + Path(PatPath), + + /// A reference pattern: `&mut var`. + Reference(PatReference), + + /// A struct or struct variant pattern: `Variant { x, y, .. }`. + Struct(PatStruct), + + /// A tuple pattern: `(a, b)`. + Tuple(PatTuple), + + /// A tuple struct or tuple variant pattern: `Variant(x, y, .., z)`. + TupleStruct(PatTupleStruct), + + /// A type ascription pattern: `foo: f64`. + Type(PatType), + + /// A pattern that matches any value: `_`. + Wild(PatWild), + + #[doc(hidden)] + __Nonexhaustive, + } +} + +ast_struct! { + /// A pattern that binds a new variable: `ref mut binding @ SUBPATTERN`. + pub struct PatIdent { + pub attrs: Vec<Attribute>, + pub by_ref: Option<Token![ref]>, + pub mutability: Option<Token![mut]>, + pub ident: Ident, + } +} + +ast_struct! { + /// A path pattern like `Color::Red`. + pub struct PatPath { + pub attrs: Vec<Attribute>, + pub path: Path, + } +} + +ast_struct! { + /// A reference pattern: `&mut var`. + pub struct PatReference { + pub attrs: Vec<Attribute>, + pub and_token: Token![&], + pub mutability: Option<Token![mut]>, + pub pat: Box<Pat>, + } +} + +ast_struct! { + /// A struct or struct variant pattern: `Variant { x, y, .. }`. + pub struct PatStruct { + pub attrs: Vec<Attribute>, + pub path: Path, + pub brace_token: token::Brace, + pub fields: Punctuated<FieldPat, Token![,]>, + pub dot2_token: Option<Token![..]>, + } +} + +ast_struct! { + /// A tuple pattern: `(a, b)`. + pub struct PatTuple { + pub attrs: Vec<Attribute>, + pub paren_token: token::Paren, + pub elems: Punctuated<Pat, Token![,]>, + } +} + +ast_struct! { + /// A tuple struct or tuple variant pattern: `Variant(x, y, .., z)`. + pub struct PatTupleStruct { + pub attrs: Vec<Attribute>, + pub path: Path, + pub pat: PatTuple, + } +} + +ast_struct! { + /// A type ascription pattern: `foo: f64`. + pub struct PatType { + pub attrs: Vec<Attribute>, + pub pat: Box<Pat>, + pub colon_token: Token![:], + pub ty: Box<Type>, + } +} + +ast_struct! { + /// A pattern that matches any value: `_`. + pub struct PatWild { + pub attrs: Vec<Attribute>, + pub underscore_token: Token![_], + } +} + +ast_struct! { + /// A single field in a struct pattern. + /// + /// Patterns like the fields of Foo `{ x, ref y, ref mut z }` are treated + /// the same as `x: x, y: ref y, z: ref mut z` but there is no colon token. + pub struct FieldPat { + pub attrs: Vec<Attribute>, + pub member: Member, + pub colon_token: Option<Token![:]>, + pub pat: Box<Pat>, + } +} + +mod parsing { + use syn::{ + braced, + ext::IdentExt, + parenthesized, + parse::{Parse, ParseStream, Result}, + punctuated::Punctuated, + token, Ident, Member, Path, Token, + }; + + use crate::path; + + use super::{ + FieldPat, Pat, PatIdent, PatPath, PatReference, PatStruct, PatTuple, PatTupleStruct, + PatWild, + }; + + impl Parse for Pat { + fn parse(input: ParseStream<'_>) -> Result<Self> { + let lookahead = input.lookahead1(); + if lookahead.peek(Ident) + && ({ + input.peek2(Token![::]) + || input.peek2(token::Brace) + || input.peek2(token::Paren) + }) + || input.peek(Token![self]) && input.peek2(Token![::]) + || lookahead.peek(Token![::]) + || lookahead.peek(Token![<]) + || input.peek(Token![Self]) + || input.peek(Token![super]) + || input.peek(Token![extern]) + || input.peek(Token![crate]) + { + pat_path_or_struct(input) + } else if lookahead.peek(Token![_]) { + input.call(pat_wild).map(Pat::Wild) + } else if lookahead.peek(Token![ref]) + || lookahead.peek(Token![mut]) + || input.peek(Token![self]) + || input.peek(Ident) + { + input.call(pat_ident).map(Pat::Ident) + } else if lookahead.peek(Token![&]) { + input.call(pat_reference).map(Pat::Reference) + } else if lookahead.peek(token::Paren) { + input.call(pat_tuple).map(Pat::Tuple) + } else { + Err(lookahead.error()) + } + } + } + + fn pat_path_or_struct(input: ParseStream<'_>) -> Result<Pat> { + let path = path::parse_path(input)?; + + if input.peek(token::Brace) { + pat_struct(input, path).map(Pat::Struct) + } else if input.peek(token::Paren) { + pat_tuple_struct(input, path).map(Pat::TupleStruct) + } else { + Ok(Pat::Path(PatPath { + attrs: Vec::new(), + path, + })) + } + } + + fn pat_wild(input: ParseStream<'_>) -> Result<PatWild> { + Ok(PatWild { + attrs: Vec::new(), + underscore_token: input.parse()?, + }) + } + + fn pat_ident(input: ParseStream<'_>) -> Result<PatIdent> { + Ok(PatIdent { + attrs: Vec::new(), + by_ref: input.parse()?, + mutability: input.parse()?, + ident: input.call(Ident::parse_any)?, + }) + } + + fn pat_tuple_struct(input: ParseStream<'_>, path: Path) -> Result<PatTupleStruct> { + Ok(PatTupleStruct { + attrs: Vec::new(), + path, + pat: input.call(pat_tuple)?, + }) + } + + fn pat_struct(input: ParseStream<'_>, path: Path) -> Result<PatStruct> { + let content; + let brace_token = braced!(content in input); + + let mut fields = Punctuated::new(); + while !content.is_empty() && !content.peek(Token![..]) { + let value = content.call(field_pat)?; + fields.push_value(value); + if !content.peek(Token![,]) { + break; + } + let punct: Token![,] = content.parse()?; + fields.push_punct(punct); + } + + let dot2_token = if fields.empty_or_trailing() && content.peek(Token![..]) { + Some(content.parse()?) + } else { + None + }; + + Ok(PatStruct { + attrs: Vec::new(), + path, + brace_token, + fields, + dot2_token, + }) + } + + fn field_pat(input: ParseStream<'_>) -> Result<FieldPat> { + let boxed: Option<Token![box]> = input.parse()?; + let by_ref: Option<Token![ref]> = input.parse()?; + let mutability: Option<Token![mut]> = input.parse()?; + let member: Member = input.parse()?; + + if boxed.is_none() && by_ref.is_none() && mutability.is_none() && input.peek(Token![:]) + || is_unnamed(&member) + { + return Ok(FieldPat { + attrs: Vec::new(), + member, + colon_token: input.parse()?, + pat: input.parse()?, + }); + } + + let ident = match member { + Member::Named(ident) => ident, + Member::Unnamed(_) => unreachable!(), + }; + + let pat = Pat::Ident(PatIdent { + attrs: Vec::new(), + by_ref, + mutability, + ident: ident.clone(), + }); + + Ok(FieldPat { + member: Member::Named(ident), + pat: Box::new(pat), + attrs: Vec::new(), + colon_token: None, + }) + } + + fn pat_tuple(input: ParseStream<'_>) -> Result<PatTuple> { + let content; + let paren_token = parenthesized!(content in input); + + let mut elems = Punctuated::new(); + while !content.is_empty() { + let value: Pat = content.parse()?; + elems.push_value(value); + if content.is_empty() { + break; + } + let punct = content.parse()?; + elems.push_punct(punct); + } + + Ok(PatTuple { + attrs: Vec::new(), + paren_token, + elems, + }) + } + + fn pat_reference(input: ParseStream<'_>) -> Result<PatReference> { + Ok(PatReference { + attrs: Vec::new(), + and_token: input.parse()?, + mutability: input.parse()?, + pat: input.parse()?, + }) + } + + fn is_unnamed(member: &Member) -> bool { + match member { + Member::Named(_) => false, + Member::Unnamed(_) => true, + } + } +} + +mod printing { + use proc_macro2::TokenStream; + use quote::{ToTokens, TokenStreamExt}; + use syn::Token; + + use super::{ + FieldPat, PatIdent, PatPath, PatReference, PatStruct, PatTuple, PatTupleStruct, PatType, + PatWild, + }; + + impl ToTokens for PatWild { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.underscore_token.to_tokens(tokens); + } + } + + impl ToTokens for PatIdent { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.by_ref.to_tokens(tokens); + self.mutability.to_tokens(tokens); + self.ident.to_tokens(tokens); + } + } + + impl ToTokens for PatStruct { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.path.to_tokens(tokens); + self.brace_token.surround(tokens, |tokens| { + self.fields.to_tokens(tokens); + // NOTE: We need a comma before the dot2 token if it is present. + if !self.fields.empty_or_trailing() && self.dot2_token.is_some() { + <Token![,]>::default().to_tokens(tokens); + } + self.dot2_token.to_tokens(tokens); + }); + } + } + + impl ToTokens for PatTupleStruct { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.path.to_tokens(tokens); + self.pat.to_tokens(tokens); + } + } + + impl ToTokens for PatType { + fn to_tokens(&self, tokens: &mut TokenStream) { + tokens.append_all(&self.attrs); + self.pat.to_tokens(tokens); + self.colon_token.to_tokens(tokens); + self.ty.to_tokens(tokens); + } + } + + impl ToTokens for PatPath { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.path.to_tokens(tokens) + } + } + + impl ToTokens for PatTuple { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.paren_token.surround(tokens, |tokens| { + self.elems.to_tokens(tokens); + }); + } + } + + impl ToTokens for PatReference { + fn to_tokens(&self, tokens: &mut TokenStream) { + self.and_token.to_tokens(tokens); + self.mutability.to_tokens(tokens); + self.pat.to_tokens(tokens); + } + } + + impl ToTokens for FieldPat { + fn to_tokens(&self, tokens: &mut TokenStream) { + if let Some(colon_token) = &self.colon_token { + self.member.to_tokens(tokens); + colon_token.to_tokens(tokens); + } + self.pat.to_tokens(tokens); + } + } +} diff --git a/syn-mid/src/path.rs b/syn-mid/src/path.rs new file mode 100644 index 0000000..8093b53 --- /dev/null +++ b/syn-mid/src/path.rs @@ -0,0 +1,50 @@ +use syn::{ + ext::IdentExt, + parse::{ParseStream, Result}, + punctuated::Punctuated, + Ident, Path, PathArguments, PathSegment, Token, +}; + +fn parse_path_segment(input: ParseStream<'_>) -> Result<PathSegment> { + if input.peek(Token![super]) + || input.peek(Token![self]) + || input.peek(Token![crate]) + || input.peek(Token![extern]) + { + let ident = input.call(Ident::parse_any)?; + return Ok(PathSegment::from(ident)); + } + + let ident = if input.peek(Token![Self]) { + input.call(Ident::parse_any)? + } else { + input.parse()? + }; + + if input.peek(Token![::]) && input.peek3(Token![<]) { + Ok(PathSegment { + ident, + arguments: PathArguments::AngleBracketed(input.parse()?), + }) + } else { + Ok(PathSegment::from(ident)) + } +} + +pub(crate) fn parse_path(input: ParseStream<'_>) -> Result<Path> { + Ok(Path { + leading_colon: input.parse()?, + segments: { + let mut segments = Punctuated::new(); + let value = parse_path_segment(input)?; + segments.push_value(value); + while input.peek(Token![::]) { + let punct: Token![::] = input.parse()?; + segments.push_punct(punct); + let value = parse_path_segment(input)?; + segments.push_value(value); + } + segments + }, + }) +} |