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#![feature(proc_macro_span)]
extern crate proc_macro;
use proc_macro::*;
// Re-emits the input tokens by parsing them from strings
#[proc_macro]
pub fn reemit(input: TokenStream) -> TokenStream {
input.to_string().parse().unwrap()
}
#[proc_macro]
pub fn assert_fake_source_file(input: TokenStream) -> TokenStream {
for tk in input {
let source_file = tk.span().source_file();
assert!(!source_file.is_real(), "Source file is real: {:?}", source_file);
}
"".parse().unwrap()
}
#[proc_macro]
pub fn assert_source_file(input: TokenStream) -> TokenStream {
for tk in input {
let source_file = tk.span().source_file();
assert!(source_file.is_real(), "Source file is not real: {:?}", source_file);
}
"".parse().unwrap()
}
#[proc_macro]
pub fn macro_stringify(input: TokenStream) -> TokenStream {
let mut tokens = input.into_iter();
let first_span = tokens.next().expect("first token").span();
let last_span = tokens.last().map(|x| x.span()).unwrap_or(first_span);
let span = first_span.join(last_span).expect("joined span");
let src = span.source_text().expect("source_text");
TokenTree::Literal(Literal::string(&src)).into()
}
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