44 lines
1.4 KiB
Rust
44 lines
1.4 KiB
Rust
// force-host
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// no-prefer-dynamic
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#![feature(proc_macro_diagnostic, proc_macro_span)]
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::{TokenStream, TokenTree, Span};
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fn lit_span(tt: TokenTree) -> (Span, String) {
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match tt {
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TokenTree::Literal(..) |
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TokenTree::Group(..) => (tt.span(), tt.to_string().trim().into()),
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_ => panic!("expected a literal in token tree, got: {:?}", tt)
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}
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}
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#[proc_macro]
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pub fn parent_source_spans(input: TokenStream) -> TokenStream {
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let mut tokens = input.into_iter();
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let (sp1, str1) = lit_span(tokens.next().expect("first string"));
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let _ = tokens.next();
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let (sp2, str2) = lit_span(tokens.next().expect("second string"));
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sp1.error(format!("first final: {}", str1)).emit();
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sp2.error(format!("second final: {}", str2)).emit();
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if let (Some(p1), Some(p2)) = (sp1.parent(), sp2.parent()) {
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p1.error(format!("first parent: {}", str1)).emit();
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p2.error(format!("second parent: {}", str2)).emit();
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if let (Some(gp1), Some(gp2)) = (p1.parent(), p2.parent()) {
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gp1.error(format!("first grandparent: {}", str1)).emit();
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gp2.error(format!("second grandparent: {}", str2)).emit();
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}
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}
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sp1.source().error(format!("first source: {}", str1)).emit();
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sp2.source().error(format!("second source: {}", str2)).emit();
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"ok".parse().unwrap()
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}
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