rust/src/test/run-pass-fulldeps/proc-macro/auxiliary/modify-ast.rs

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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// no-prefer-dynamic
#![crate_type = "proc-macro"]
#![feature(proc_macro)]
extern crate proc_macro;
use proc_macro::*;
#[proc_macro_attribute]
pub fn assert1(_a: TokenStream, b: TokenStream) -> TokenStream {
assert_eq(b.clone(), "pub fn foo() {}".parse().unwrap());
b
}
#[proc_macro_derive(Foo, attributes(foo))]
pub fn assert2(a: TokenStream) -> TokenStream {
assert_eq(a, "pub struct MyStructc { _a: i32, }".parse().unwrap());
TokenStream::empty()
}
fn assert_eq(a: TokenStream, b: TokenStream) {
let mut a = a.into_iter();
let mut b = b.into_iter();
for (a, b) in a.by_ref().zip(&mut b) {
match (a, b) {
(TokenTree::Group(a), TokenTree::Group(b)) => {
assert_eq!(a.delimiter(), b.delimiter());
assert_eq(a.stream(), b.stream());
}
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(TokenTree::Punct(a), TokenTree::Punct(b)) => {
assert_eq!(a.as_char(), b.as_char());
assert_eq!(a.spacing(), b.spacing());
}
(TokenTree::Literal(a), TokenTree::Literal(b)) => {
assert_eq!(a.to_string(), b.to_string());
}
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(TokenTree::Ident(a), TokenTree::Ident(b)) => {
assert_eq!(a.to_string(), b.to_string());
}
(a, b) => panic!("{:?} != {:?}", a, b),
}
}
assert!(a.next().is_none());
assert!(b.next().is_none());
}