52 lines
1.8 KiB
Rust
52 lines
1.8 KiB
Rust
|
// 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
|
||
|
|
#![feature(proc_macro)]
|
||
|
|
#![crate_type = "proc-macro"]
|
||
|
|
|
||
|
|
extern crate proc_macro;
|
||
|
|
|
||
|
|
use proc_macro::{TokenStream, TokenTree, TokenNode, Span};
|
||
|
|
|
||
|
|
fn lit_span(tt: TokenTree) -> (Span, String) {
|
||
|
|
use TokenNode::*;
|
||
|
|
match tt.kind {
|
||
|
|
Literal(..) | Group(..) => (tt.span, tt.to_string().trim().into()),
|
||
|
|
_ => panic!("expected a literal in token tree, got: {:?}", tt)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[proc_macro]
|
||
|
|
pub fn parent_source_spans(input: TokenStream) -> TokenStream {
|
||
|
|
let mut tokens = input.into_iter();
|
||
|
|
let (sp1, str1) = lit_span(tokens.next().expect("first string"));
|
||
|
|
let _ = tokens.next();
|
||
|
|
let (sp2, str2) = lit_span(tokens.next().expect("second string"));
|
||
|
|
|
||
|
|
sp1.error(format!("first final: {}", str1)).emit();
|
||
|
|
sp2.error(format!("second final: {}", str2)).emit();
|
||
|
|
|
||
|
|
if let (Some(p1), Some(p2)) = (sp1.parent(), sp2.parent()) {
|
||
|
|
p1.error(format!("first parent: {}", str1)).emit();
|
||
|
|
p2.error(format!("second parent: {}", str2)).emit();
|
||
|
|
|
||
|
|
if let (Some(gp1), Some(gp2)) = (p1.parent(), p2.parent()) {
|
||
|
|
gp1.error(format!("first grandparent: {}", str1)).emit();
|
||
|
|
gp2.error(format!("second grandparent: {}", str2)).emit();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
sp1.source().error(format!("first source: {}", str1)).emit();
|
||
|
|
sp2.source().error(format!("second source: {}", str2)).emit();
|
||
|
|
|
||
|
|
"ok".parse().unwrap()
|
||
|
|
}
|