The Syn crate has fairly coarse compile-time control over the set of available syntax tree types. There is default-features = false mode where only the parsing API is provided with no syntax tree types at all, there is features = ["derive"] which is the default and supports structs and enums, and there is features = ["full"] which supports all possible Rust syntax.

syn, a parser for Rust token streams. quote provides a handy way to produce Rust token streams by writting Rust code. Using these libraries, we can write a simple procedural macro attribute that’d be a drop-in replacement for the standard # [test] attribute.

This crate provides the following two unique data structures. syn_mid::ItemFn -- A function whose body 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 Parse a proc-macro2 token stream into the chosen syntax tree node.

Syn itemfn

Struct ink_lang_ir:: InkTest [−] pub struct InkTest { pub item_fn: ItemFn, } The ink! test with all required information. Fields item_fn: ItemFn. The function which was annotated.

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syn::custom_keyword! (id); } ItemFn from the syn crate holds the parsed TokenStream of a Rust function. parse_macro_input! is a helper macro provided by syn.

use syn:: fold:: {self, Fold}; use syn:: parse:: {Parse, ParseStream, Result}; use syn:: punctuated:: Punctuated; use syn:: {parse_macro_input, parse_quote, Expr, Ident, ItemFn, Local, Pat, Stmt, Token}; /// Parses a list of variable names separated by commas. /// /// a, b, c /// /// This is how the compiler passes in arguments to our attribute -- it is

/// /// All three traits have a method corresponding to each type of node in Syn's /// syntax tree.

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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.

Fields item_fn: ItemFn. The function which was annotated. Implementations impl InkTest. pub fn 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 GitHub Gist: star and fork palfrey's gists by creating an account on GitHub.
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Sep 23, 2019 5511 5512 @findex uref 5513 @code{@@uref} is a synonym for 8947 @item fn 8948 @cindex @code{fn} (function) index 8949 @findex

RefUnwindSafe!Send!Sync Unpin UnwindSafe. Blanket Implementations. ?

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It took a little work reading the syn documentation, but once we got the hang of it, we can now work with real Rust source code and turn it into something we can use. Oh, before we go, let's clean one thing up.

/// /// 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!