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use crate::tests::{matches_codepattern, string_to_crate};
use rustc_ast as ast;
use rustc_ast::mut_visit::MutVisitor;
use rustc_ast_pretty::pprust;
use rustc_span::create_default_session_globals_then;
use rustc_span::symbol::Ident;
// This version doesn't care about getting comments or doc-strings in.
fn print_crate_items(krate: &ast::Crate) -> String {
krate.items.iter().map(|i| pprust::item_to_string(i)).collect::<Vec<_>>().join(" ")
}
// Change every identifier to "zz".
struct ToZzIdentMutVisitor;
impl MutVisitor for ToZzIdentMutVisitor {
const VISIT_TOKENS: bool = true;
fn visit_ident(&mut self, ident: &mut Ident) {
*ident = Ident::from_str("zz");
}
}
// Maybe add to `expand.rs`.
macro_rules! assert_pred {
($pred:expr, $predname:expr, $a:expr , $b:expr) => {{
let pred_val = $pred;
let a_val = $a;
let b_val = $b;
if !(pred_val(&a_val, &b_val)) {
panic!("expected args satisfying {}, got {} and {}", $predname, a_val, b_val);
}
}};
}
// Make sure idents get transformed everywhere.
#[test]
fn ident_transformation() {
create_default_session_globals_then(|| {
let mut zz_visitor = ToZzIdentMutVisitor;
let mut krate =
string_to_crate("#[a] mod b {fn c (d : e, f : g) {h!(i,j,k);l;m}}".to_string());
zz_visitor.visit_crate(&mut krate);
assert_pred!(
matches_codepattern,
"matches_codepattern",
print_crate_items(&krate),
"#[zz]mod zz{fn zz(zz:zz,zz:zz){zz!(zz,zz,zz);zz;zz}}".to_string()
);
})
}
// Make sure idents get transformed even inside macro defs.
#[test]
fn ident_transformation_in_defs() {
create_default_session_globals_then(|| {
let mut zz_visitor = ToZzIdentMutVisitor;
let mut krate = string_to_crate(
"macro_rules! a {(b $c:expr $(d $e:token)f+ => \
(g $(d $d $e)+))} "
.to_string(),
);
zz_visitor.visit_crate(&mut krate);
assert_pred!(
matches_codepattern,
"matches_codepattern",
print_crate_items(&krate),
"macro_rules! zz{(zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+))}".to_string()
);
})
}
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