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//! Exports a few trivial procedural macros for testing.
use proc_macro::{Group, Ident, Punct, TokenStream, TokenTree};
#[proc_macro]
pub fn fn_like_noop(args: TokenStream) -> TokenStream {
args
}
#[proc_macro]
pub fn fn_like_panic(args: TokenStream) -> TokenStream {
panic!("fn_like_panic!({})", args);
}
#[proc_macro]
pub fn fn_like_error(args: TokenStream) -> TokenStream {
format!("compile_error!(\"fn_like_error!({})\");", args).parse().unwrap()
}
#[proc_macro]
pub fn fn_like_clone_tokens(args: TokenStream) -> TokenStream {
clone_stream(args)
}
#[proc_macro_attribute]
pub fn attr_noop(_args: TokenStream, item: TokenStream) -> TokenStream {
item
}
#[proc_macro_attribute]
pub fn attr_panic(args: TokenStream, item: TokenStream) -> TokenStream {
panic!("#[attr_panic {}] {}", args, item);
}
#[proc_macro_attribute]
pub fn attr_error(args: TokenStream, item: TokenStream) -> TokenStream {
format!("compile_error!(\"#[attr_error({})] {}\");", args, item).parse().unwrap()
}
#[proc_macro_derive(DeriveEmpty)]
pub fn derive_empty(_item: TokenStream) -> TokenStream {
TokenStream::new()
}
#[proc_macro_derive(DerivePanic)]
pub fn derive_panic(item: TokenStream) -> TokenStream {
panic!("#[derive(DerivePanic)] {}", item);
}
#[proc_macro_derive(DeriveError)]
pub fn derive_error(item: TokenStream) -> TokenStream {
format!("compile_error!(\"#[derive(DeriveError)] {}\");", item).parse().unwrap()
}
fn clone_stream(ts: TokenStream) -> TokenStream {
ts.into_iter().map(clone_tree).collect()
}
fn clone_tree(t: TokenTree) -> TokenTree {
match t {
TokenTree::Group(orig) => {
let mut new = Group::new(orig.delimiter(), clone_stream(orig.stream()));
new.set_span(orig.span());
TokenTree::Group(new)
}
TokenTree::Ident(orig) => TokenTree::Ident(Ident::new(&orig.to_string(), orig.span())),
TokenTree::Punct(orig) => {
let mut new = Punct::new(orig.as_char(), orig.spacing());
new.set_span(orig.span());
TokenTree::Punct(new)
}
TokenTree::Literal(_orig) => unimplemented!(),
}
}
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