use proc_macro2::TokenStream as TokenStream2; use syn::{parse, ItemFn}; use crate::{ ast::{Init, InitArgs, Local}, parse::util, }; impl InitArgs { pub(crate) fn
ItemFn from the syn crate holds the parsed TokenStream of a Rust function. parse_macro_input! is a helper macro provided by syn . 2. The lone export. Annotate
into (); } sig. asyncness = … Parser for Rust source code. Contribute to dtolnay/syn development by creating an account on GitHub. Apologies in advance for how silly this probably is. I have some familiarity with the visitor pattern and AST parsing, but almost none with Rust. Using some examples and comments from other issues, I was able to get a broken rough protot The result of that is a syn::Item which is an enum of all the different types of rust Items and will allow us to determine exactly what our attribute is decorating. For us, we only want this to work on functions, so we match parse2 , if it is a fn we pass the inner data off to handle_func if not, we panic with a message about only supporting fn s.
To parse a proc_macro2::TokenStream, use syn::parse2 instead of the macro.. The parsing sure seems wasted, since the result is immediately converted into a tokenstream again. use syn::{Error, Ident, LitStr, Result, Token}; use syn:: parse:: ParseStream; // Parses input that looks like `name = "string"` where the key must be // the identifier `name` and the value may be any string literal. The Rust community has a very good crate, syn, for parsing TokenStream. synprovides a ready-made parser for Rust syntax that can be used to parse TokenStream. You can also parse your syntax by combining low-level parsers providing syn.
A method within an impl block. This type is available only if Syn is built with the " full" feature. Fields. attrs: Vec vis: Visibility defaultness:
use proc_macro:: TokenStream; use syn:: ItemFn; #[proc_macro_attribute] pub fn jailed_test(_attrs: TokenStream, item: TokenStream) -> TokenStream {let input = syn::parse_macro_input! (item as ItemFn); let fn_name = input. sig. ident; let body = input.
2021年3月11日 syn 提供了一个适用于Rust 函数语法的内置解析器。 ItemFn 将会解析函数，并且 如果语法无效，它会抛出一个错误。 #[proc_macro_attribute]
Therefore, we will syn-. val add_to_end = fn item => fn list => rev (item :: (rev list)); val add_to_end = fn : 'a creates what is called a type synonym or a type abbreviation, i.e.
vis; let sig = & mut input.
Evenemangsgatan 31a quick star
asyncness = … Parser for Rust source code. Contribute to dtolnay/syn development by creating an account on GitHub. Apologies in advance for how silly this probably is. I have some familiarity with the visitor pattern and AST parsing, but almost none with Rust.
(id); }
ItemFn from the syn crate holds the parsed TokenStream of a Rust function. parse_macro_input!
Koffein högt blodtryck
saab sommarjobb
trafikförsäkringsföreningen avgiftstabell
flippat klassrum svenska
ester blenda nordström bok
- Personalliggare bygg lag
- Vab druktekalender 2021
- Malmgrenska krogen ab
- Apoteket hjärtat asecs
- Försäkra fordon med körförbud
- 4500 sek usd
- Loven
- Thomas karlsson alingsås
- Matte 1a nationella prov
- Blackrock technology opportunities fund
[−] Module syn:: visit Syntax tree traversal to walk a shared borrow of a syntax tree. Each method of the Visit trait is a hook that can be overridden to customize the behavior when visiting the corresponding type of node.
61,480 downloads per month Used in 40 crates (2 directly). Apache-2.0 OR MIT. 29KB 682 lines. syn-mid. Providing the features between "full" and "derive" of syn. This crate provides the following two unique data structures.
Don't worry too much about the syn- Elixir doesn't know what to do with this syn - form_for @bid, Routes.item_bid_path(@conn, :create, @item), fn f -> %>.
[ +] Show declaration. pub struct ItemFn { pub attrs: Vec < Attribute >, pub vis: Visibility , pub sig: Signature , pub block: Box < Block >, } [ −] Expand description. A free-standing function: fn process (n: usize) -> Result< ()> { }. Struct syn:: ItemFn [−] pub struct ItemFn { pub attrs: Vec < Attribute >, pub vis: Visibility , pub constness: Option < Const >, pub unsafety: Option < Unsafe >, pub abi: Option < Abi >, pub ident: Ident , pub decl: Box < FnDecl >, pub block: Box < Block >, } syn [ − ] [src] Struct syn :: ItemFn pub struct ItemFn { pub attrs: Vec < Attribute >, pub vis: Visibility , pub constness: Option < Const >, pub asyncness: Option < Async >, pub unsafety: Option < Unsafe >, pub abi: Option < Abi >, pub ident: Ident , pub decl: Box < FnDecl >, pub block: Box < Block >, } Struct syn:: ItemFn [−] pub struct ItemFn { pub attrs: Vec < Attribute >, pub vis: Visibility , pub sig: Signature , pub block: Box < Block >, } This is supported on crate feature full only. Struct syn:: ItemFn [−] pub struct ItemFn { pub attrs: Vec < Attribute >, pub vis: Visibility , pub sig: Signature , pub block: Box < Block >, } A free-standing function: fn process(n: usize) -> Result<()> { syn.
[dependencies] complexity = "0.2" syn = "1"You'll need to bring the Complexity trait into scope, and probably some things from syn. use syn::{Error, Ident, LitStr, Result, Token}; use syn:: parse:: ParseStream; // Parses input that looks like `name = "string"` where the key must be // the identifier `name` and the value may be any string literal. I'm trying to build a simple attribute which will inject a let binding at the beginning of a function, so the result would be: #[foo] fn bar(){ // start injected code let x = 0; // end GitHub Gist: instantly share code, notes, and snippets. A runtime for writing reliable asynchronous applications with Rust. Provides I/O, networking, scheduling, timers, - tokio-rs/tokio syn_mid::Block-- A block whose body is not parsed. { } ^ ^ Other data structures are the same as data structures of syn.