syn-mid-0.5.0/.editorconfig010064400007650000024000000007251354664721500140110ustar0000000000000000# EditorConfig configuration # https://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 json/yaml/markdown, set 2 space indentation [*.{json,yml,md}] indent_style = space indent_size = 2 syn-mid-0.5.0/.gitattributes010064400007650000024000000001501355275511500142130ustar0000000000000000[attr]rust text eol=lf whitespace=tab-in-indent,trailing-space,tabwidth=4 * text=auto eol=lf *.rs rust syn-mid-0.5.0/.github/bors.toml010064400007650000024000000003021354602534600145200ustar0000000000000000status = [ "test (1.31.0)", "test (stable)", "test (beta)", "test (nightly)", "style (clippy)", "style (rustfmt)", "style (rustdoc)", ] delete_merged_branches = true syn-mid-0.5.0/.github/CODEOWNERS010064400007650000024000000000131355357373700142620ustar0000000000000000* @taiki-e syn-mid-0.5.0/.github/workflows/ci.yml010064400007650000024000000046741356715574500160630ustar0000000000000000name: ci on: pull_request: push: branches: - master - staging - trying schedule: - cron: '00 01 * * *' env: RUSTFLAGS: -Dwarnings jobs: test: name: test runs-on: ubuntu-latest strategy: matrix: rust: # This is the minimum supported Rust version of this crate. # 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. - 1.31.0 - stable - beta - nightly steps: - uses: actions/checkout@master - name: Install Rust shell: bash run: | . ./ci/install-rust.sh ${{ matrix.rust }} - name: Install cargo-hack if: matrix.rust != '1.31.0' run: | cargo install cargo-hack - name: cargo check if: matrix.rust == '1.31.0' run: | cargo check --all-features - name: cargo test if: matrix.rust != '1.31.0' run: | cargo test --all-features - name: cargo hack check --each-feature if: matrix.rust != '1.31.0' run: | cargo hack check --all --each-feature --no-dev-deps # Refs: https://github.com/rust-lang/cargo/issues/5657 - name: cargo check -Zminimal-versions if: matrix.rust == 'nightly' run: | cargo update -Zminimal-versions cargo hack check --all --all-features --no-dev-deps --ignore-private style: name: style runs-on: ubuntu-latest strategy: fail-fast: false matrix: component: - clippy - rustfmt - rustdoc steps: - uses: actions/checkout@master - name: Install Rust shell: bash run: | . ./ci/install-rust.sh - name: Install component if: matrix.component != 'rustdoc' shell: bash run: | . ./ci/install-component.sh ${{ matrix.component }} - name: cargo clippy if: matrix.component == 'clippy' run: | cargo clippy --all --all-features - name: cargo fmt -- --check if: matrix.component == 'rustfmt' run: | cargo fmt --all -- --check - name: cargo doc if: matrix.component == 'rustdoc' env: RUSTDOCFLAGS: -Dwarnings run: | cargo doc --no-deps --all --all-features syn-mid-0.5.0/.gitignore010064400007650000024000000003301355275575300133200ustar0000000000000000target **/*.rs.bk Cargo.lock # For platform and editor specific settings, it is recommended to add to # a global .gitignore file. # Refs: https://help.github.com/en/articles/ignoring-files#create-a-global-gitignore syn-mid-0.5.0/.rustfmt.toml010064400007650000024000000015501355275575300140140ustar0000000000000000# Rustfmt configuration # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md # This is required for bug-fixes, which technically can't be made to the stable # first version. version = "Two" # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3383 # Refs: https://internals.rust-lang.org/t/running-rustfmt-on-rust-lang-rust-and-other-rust-lang-repositories/8732/72 use_small_heuristics = "Max" # Apply rustfmt to more places. merge_imports = true # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3362 format_code_in_doc_comments = true # Tracking issue: https://github.com/rust-lang/rustfmt/issues/3348 # Set the default settings again to always apply the proper formatting without # being affected by the editor settings. # Refs: https://github.com/rust-lang/rls/issues/501#issuecomment-333717736 edition = "2018" tab_spaces = 4 syn-mid-0.5.0/Cargo.toml.orig010064400007650000024000000013451357340133600142120ustar0000000000000000[package] name = "syn-mid" version = "0.5.0" authors = ["Taiki Endo "] edition = "2018" license = "Apache-2.0 OR MIT" repository = "https://github.com/taiki-e/syn-mid" homepage = "https://github.com/taiki-e/syn-mid" documentation = "https://docs.rs/syn-mid" keywords = ["syn", "macros"] categories = ["development-tools::procedural-macro-helpers"] readme = "README.md" 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 = "1.0.5", default-features = false, features = ["parsing", "printing", "derive"] } syn-mid-0.5.0/Cargo.toml0000644000000023161357344645100105300ustar00# 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 believe there's an error in this file please file an # issue against the rust-lang/cargo repository. If you're # editing this file be aware that the upstream Cargo.toml # will likely look very different (and much more reasonable) [package] edition = "2018" name = "syn-mid" version = "0.5.0" authors = ["Taiki Endo "] description = "Providing the features between \"full\" and \"derive\" of syn.\n" homepage = "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"] license = "Apache-2.0 OR MIT" repository = "https://github.com/taiki-e/syn-mid" [dependencies.proc-macro2] version = "1.0" [dependencies.quote] version = "1.0" [dependencies.syn] version = "1.0.5" features = ["parsing", "printing", "derive"] default-features = false [features] clone-impls = ["syn/clone-impls"] syn-mid-0.5.0/CHANGELOG.md010064400007650000024000000024151357344624000131360ustar0000000000000000# Changelog All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](https://semver.org). ## [Unreleased] ## [0.5.0] - 2019-12-09 * [Added `Signature` type.][13] [13]: https://github.com/taiki-e/syn-mid/pull/13 ## [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 - YANKED Initial release [Unreleased]: https://github.com/taiki-e/syn-mid/compare/v0.5.0...HEAD [0.5.0]: https://github.com/taiki-e/syn-mid/compare/v0.4.0...v0.5.0 [0.4.0]: https://github.com/taiki-e/syn-mid/compare/v0.3.0...v0.4.0 [0.3.0]: https://github.com/taiki-e/syn-mid/compare/v0.2.0...v0.3.0 [0.2.0]: https://github.com/taiki-e/syn-mid/compare/v0.1.0...v0.2.0 [0.1.0]: https://github.com/taiki-e/syn-mid/releases/tag/v0.1.0 syn-mid-0.5.0/ci/install-component.sh010064400007650000024000000016121356715574500157320ustar0000000000000000#!/bin/bash set -euo pipefail component="${1}" if ! rustup component add "${component}" 2>/dev/null; then # If the component is unavailable on the latest nightly, # use the latest toolchain with the component available. # Refs: https://github.com/rust-lang/rustup-components-history#the-web-part target=$(curl -sSf "https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/${component}") echo "'${component}' is unavailable on the default toolchain, use the toolchain 'nightly-${target}' instead" rustup update "nightly-${target}" --no-self-update rustup default "nightly-${target}" echo "Query rust and cargo versions:" rustup -V rustc -V cargo -V rustup component add "${component}" fi echo "Query component versions:" case "${component}" in clippy | miri) cargo "${component}" -V ;; rustfmt) "${component}" -V ;; esac syn-mid-0.5.0/ci/install-rust.sh010064400007650000024000000007231356715574500147270ustar0000000000000000#!/bin/bash set -euo pipefail toolchain="${1:-nightly}" if rustup -V 2>/dev/null; then rustup set profile minimal rustup update "${toolchain}" --no-self-update rustup default "${toolchain}" else curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "${toolchain}" export PATH=${PATH}:${HOME}/.cargo/bin echo "##[add-path]${HOME}/.cargo/bin" fi echo "Query rust and cargo versions:" rustup -V rustc -V cargo -V syn-mid-0.5.0/LICENSE-APACHE010060000007650000024000000261361340521270600132370ustar0000000000000000 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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See the License for the specific language governing permissions and limitations under the License. syn-mid-0.5.0/LICENSE-MIT010060000007650000024000000017771340521270600127530ustar0000000000000000Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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. syn-mid-0.5.0/README.md010064400007650000024000000036041357340134400126010ustar0000000000000000# syn-mid [![crates-badge]][crates-url] [![docs-badge]][docs-url] [![license-badge]][license] [![rustc-badge]][rustc-url] [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 [license-badge]: https://img.shields.io/crates/l/syn-mid.svg [license]: #license [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 = "0.5" ``` 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 ) * MIT license ([LICENSE-MIT](LICENSE-MIT) or ) 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. syn-mid-0.5.0/src/arg.rs010064400007650000024000000054241352525270100132300ustar0000000000000000use 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, pub reference: Option<(Token![&], Option)>, pub mutability: Option, 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 { let attrs = input.call(Attribute::parse_outer)?; let ahead = input.fork(); if let Ok(mut receiver) = ahead.parse::() { 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 { 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 { 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); } } } syn-mid-0.5.0/src/lib.rs010064400007650000024000000164551357340134700132400ustar0000000000000000//! 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/0.5.0")] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms, single_use_lifetimes), allow(dead_code)) ))] #![forbid(unsafe_code)] #![warn(rust_2018_idioms, single_use_lifetimes, unreachable_pub)] #![warn(clippy::all)] #![allow(clippy::eval_order_dependence, clippy::large_enum_variant)] // 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::*, pat::*}; use proc_macro2::TokenStream; use syn::{ punctuated::Punctuated, token, Abi, Attribute, Generics, Ident, ReturnType, Token, Variadic, 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, pub vis: Visibility, pub sig: Signature, pub block: Box, } } ast_struct! { /// A function signature in a trait or implementation: `unsafe fn /// initialize(&self)`. pub struct Signature { pub constness: Option, pub asyncness: Option, pub unsafety: Option, pub abi: Option, pub fn_token: Token![fn], pub ident: Ident, pub generics: Generics, pub paren_token: token::Paren, pub inputs: Punctuated, pub variadic: Option, pub output: ReturnType, } } mod parsing { use syn::{ braced, parenthesized, parse::{Parse, ParseStream, Result}, parse2, Abi, Attribute, Generics, Ident, ReturnType, Token, Type, Variadic, Visibility, WhereClause, }; use super::{Block, FnArg, ItemFn, PatType, Signature}; impl Parse for Block { fn parse(input: ParseStream<'_>) -> Result { let content; Ok(Self { brace_token: braced!(content in input), stmts: content.parse()? }) } } impl Parse for ItemFn { fn parse(input: ParseStream<'_>) -> Result { let attrs = input.call(Attribute::parse_outer)?; let vis: Visibility = input.parse()?; let constness: Option = input.parse()?; let asyncness: Option = input.parse()?; let unsafety: Option = input.parse()?; let abi: Option = 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 variadic = inputs.last().as_ref().and_then(get_variadic); #[allow(clippy::trivially_copy_pass_by_ref)] fn get_variadic(input: &&FnArg) -> Option { if let FnArg::Typed(PatType { ty, .. }) = input { if let Type::Verbatim(tokens) = &**ty { if let Ok(dots) = parse2(tokens.clone()) { return Some(Variadic { attrs: Vec::new(), dots }); } } } None } let output: ReturnType = input.parse()?; let where_clause: Option = input.parse()?; let block = input.parse()?; Ok(Self { attrs, vis, sig: Signature { constness, asyncness, unsafety, abi, fn_token, ident, paren_token, inputs, output, variadic, generics: Generics { where_clause, ..generics }, }, block: Box::new(block), }) } } } mod printing { use proc_macro2::TokenStream; use quote::{ToTokens, TokenStreamExt}; use syn::{punctuated::Punctuated, Token, Type}; use super::{Block, FnArg, ItemFn, Signature}; impl ToTokens for Block { fn to_tokens(&self, tokens: &mut TokenStream) { self.brace_token.surround(tokens, |tokens| { tokens.append_all(self.stmts.clone()); }); } } fn has_variadic(inputs: &Punctuated) -> bool { let last = match inputs.last() { Some(last) => last, None => return false, }; let pat = match last { FnArg::Typed(pat) => pat, FnArg::Receiver(_) => return false, }; let tokens = match pat.ty.as_ref() { Type::Verbatim(tokens) => tokens, _ => return false, }; tokens.to_string() == "..." } impl ToTokens for Signature { fn to_tokens(&self, tokens: &mut TokenStream) { 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); if self.variadic.is_some() && !has_variadic(&self.inputs) { if !self.inputs.empty_or_trailing() { ::default().to_tokens(tokens); } self.variadic.to_tokens(tokens); } }); self.output.to_tokens(tokens); self.generics.where_clause.to_tokens(tokens); } } impl ToTokens for ItemFn { fn to_tokens(&self, tokens: &mut TokenStream) { tokens.append_all(&self.attrs); self.vis.to_tokens(tokens); self.sig.to_tokens(tokens); self.block.brace_token.surround(tokens, |tokens| { tokens.append_all(self.block.stmts.clone()); }); } } } syn-mid-0.5.0/src/macros.rs010064400007650000024000000051371352525270100137440ustar0000000000000000macro_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) => {}; } syn-mid-0.5.0/src/pat.rs010064400007650000024000000263721354531560700132570ustar0000000000000000use 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, pub by_ref: Option, pub mutability: Option, pub ident: Ident, } } ast_struct! { /// A path pattern like `Color::Red`. pub struct PatPath { pub attrs: Vec, pub path: Path, } } ast_struct! { /// A reference pattern: `&mut var`. pub struct PatReference { pub attrs: Vec, pub and_token: Token![&], pub mutability: Option, pub pat: Box, } } ast_struct! { /// A struct or struct variant pattern: `Variant { x, y, .. }`. pub struct PatStruct { pub attrs: Vec, pub path: Path, pub brace_token: token::Brace, pub fields: Punctuated, pub dot2_token: Option, } } ast_struct! { /// A tuple pattern: `(a, b)`. pub struct PatTuple { pub attrs: Vec, pub paren_token: token::Paren, pub elems: Punctuated, } } ast_struct! { /// A tuple struct or tuple variant pattern: `Variant(x, y, .., z)`. pub struct PatTupleStruct { pub attrs: Vec, pub path: Path, pub pat: PatTuple, } } ast_struct! { /// A type ascription pattern: `foo: f64`. pub struct PatType { pub attrs: Vec, pub pat: Box, pub colon_token: Token![:], pub ty: Box, } } ast_struct! { /// A pattern that matches any value: `_`. pub struct PatWild { pub attrs: Vec, 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, pub member: Member, pub colon_token: Option, pub pat: Box, } } 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 { 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 { 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 { Ok(PatWild { attrs: Vec::new(), underscore_token: input.parse()? }) } fn pat_ident(input: ParseStream<'_>) -> Result { 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 { Ok(PatTupleStruct { attrs: Vec::new(), path, pat: input.call(pat_tuple)? }) } fn pat_struct(input: ParseStream<'_>, path: Path) -> Result { 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 { let boxed: Option = input.parse()?; let by_ref: Option = input.parse()?; let mutability: Option = 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 { 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 { 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() { ::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); } } } syn-mid-0.5.0/src/path.rs010064400007650000024000000025351354531560700134220ustar0000000000000000use syn::{ ext::IdentExt, parse::{ParseStream, Result}, punctuated::Punctuated, Ident, Path, PathArguments, PathSegment, Token, }; fn parse_path_segment(input: ParseStream<'_>) -> Result { 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 { 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 }, }) } syn-mid-0.5.0/.cargo_vcs_info.json0000644000000001121357344645100125220ustar00{ "git": { "sha1": "4cc7697b87772a2eab48efd9dec4e293276dbc20" } }