38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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// 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 assert_span_pos(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 argument"));
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let _ = tokens.next();
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let (_sp2, str2) = lit_span(tokens.next().expect("second argument"));
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let line: usize = str1.parse().unwrap();
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let col: usize = str2.parse().unwrap();
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let sp1s = sp1.start();
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if (line, col) != (sp1s.line, sp1s.column) {
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let msg = format!("line/column mismatch: ({}, {}) != ({}, {})", line, col,
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sp1s.line, sp1s.column);
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sp1.error(msg).emit();
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}
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"".parse().unwrap()
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}
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