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|
//! 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());
});
}
}
}
|
