mirror of https://github.com/rust-lang/rust
46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
//@ force-host
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//@ no-prefer-dynamic
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#![crate_type = "proc-macro"]
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#![feature(proc_macro_span)]
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extern crate proc_macro;
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use proc_macro::*;
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// Re-emits the input tokens by parsing them from strings
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#[proc_macro]
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pub fn reemit(input: TokenStream) -> TokenStream {
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input.to_string().parse().unwrap()
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}
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#[proc_macro]
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pub fn assert_fake_source_file(input: TokenStream) -> TokenStream {
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for tk in input {
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let source_file = tk.span().source_file();
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assert!(!source_file.is_real(), "Source file is real: {:?}", source_file);
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}
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"".parse().unwrap()
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}
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#[proc_macro]
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pub fn assert_source_file(input: TokenStream) -> TokenStream {
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for tk in input {
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let source_file = tk.span().source_file();
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assert!(source_file.is_real(), "Source file is not real: {:?}", source_file);
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}
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"".parse().unwrap()
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}
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#[proc_macro]
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pub fn macro_stringify(input: TokenStream) -> TokenStream {
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let mut tokens = input.into_iter();
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let first_span = tokens.next().expect("first token").span();
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let last_span = tokens.last().map(|x| x.span()).unwrap_or(first_span);
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let span = first_span.join(last_span).expect("joined span");
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let src = span.source_text().expect("source_text");
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TokenTree::Literal(Literal::string(&src)).into()
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}
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