func.rs.html -- source

no_std_compat::cmp::Eq - Rust

Actix Web re-exports a version of this crate in it's entirety so you usually don't have to //! specify a dependency on this crate explicitly. Sometimes, however, updates are made to this //! crate before the actix-web dependency is updated. Therefore, code examples here will show //! explicit imports.

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This type is available only if Syn is built with the "full" feature. use quote:: quote; use syn:: visit::{self, Visit}; use syn::{File, ItemFn}; struct FnVisitor < 'ast > { functions: Vec < & 'ast ItemFn >, } impl < 'ast > Visit < 'ast > for FnVisitor < 'ast > { fn visit_item_fn (& mut self, node: & 'ast ItemFn) { self. functions. push (node); visit:: visit_item_fn (self, node); } } fn main { let code = quote! { pub fn f { fn g {} } }; let syntax_tree: File = syn:: parse2 (code).

no_std_compat::cmp::Eq - Rust

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.

Merge branch 'master' of github.com:actix/actix-net - Repos

[. −. ] [src] Things that can appear directly inside of a module or scope. This type is available only if Syn is built with the "full" feature. use quote:: quote; use syn:: visit::{self, Visit}; use syn::{File, ItemFn}; struct FnVisitor < 'ast > { functions: Vec < & 'ast ItemFn >, } impl < 'ast > Visit < 'ast > for FnVisitor < 'ast > { fn visit_item_fn (& mut self, node: & 'ast ItemFn) { self.

The FnDecl type; syn has it to share with extern fns, trait methods and impl methods, but you don't have those. The ItemFn::variadic field, since only extern functions can be variadic. 61,480 downloads per month Used in 40 crates (2 directly).
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/// /// a, b, c /// /// This is how the compiler passes in arguments to our attribute -- it is 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.

//! # Actix Web Re-exports //! Actix Web re-exports a version of this crate in it's entirety so you usually don't have to //!
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func.rs.html -- source

Benefits. Easy and declarative parsing of macro input - make your proc-macros highly controllable with minimal time investment. GitHub Gist: star and fork bstrie's gists by creating an account on GitHub. Trait implementations are provided for primitives, some std types, and some syn types.

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A free-standing function: fn process (n: usize) -> Result< ()> { Struct syn:: ItemFn −] pub struct This type is available only if Syn is built with the "full" feature. Fields attrs: Vec vis: Visibility sig API documentation for the Rust `ItemFn` struct in crate `syn`. 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<()> { API documentation for the Rust `ItemFn` struct in crate `syn`. Docs.rs.

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. 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 Perhaps my favorite feature in the Rust 2018 edition is procedural macros.Procedural macros have had a long and storied history in Rust (and will continue to have a storied future!), and now is perhaps one of the best times to get involved with them because the 2018 edition has so dramatically improved the experience both defining and using them.