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tt-attrs

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This commit is contained in:
Aleksey Kladov 2018-08-16 12:51:40 +03:00
parent 1193c5f829
commit 7094291573
18 changed files with 260 additions and 276 deletions
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56
crates/libsyntax2/src/grammar/attributes.rs
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@ -22,58 +22,10 @@ fn attribute(p: &mut Parser, inner: bool) {
p.bump();
}
if p.expect(L_BRACK) {
meta_item(p);
p.expect(R_BRACK);
if p.at(L_BRACK) {
items::token_tree(p);
} else {
p.error("expected `[`");
}
attr.complete(p, ATTR);
}
fn meta_item(p: &mut Parser) {
if p.at(IDENT) {
let meta_item = p.start();
p.bump();
match p.current() {
EQ => {
p.bump();
if expressions::literal(p).is_none() {
p.error("expected literal");
}
}
L_PAREN => meta_item_arg_list(p),
_ => (),
}
meta_item.complete(p, META_ITEM);
} else {
p.error("expected attribute value");
}
}
fn meta_item_arg_list(p: &mut Parser) {
assert!(p.at(L_PAREN));
p.bump();
loop {
match p.current() {
EOF | R_PAREN => break,
IDENT => meta_item(p),
c => if expressions::literal(p).is_none() {
let message = "expected attribute";
if items::ITEM_FIRST.contains(c) {
p.error(message);
return;
}
let err = p.start();
p.error(message);
p.bump();
err.complete(p, ERROR);
continue;
},
}
if !p.at(R_PAREN) {
p.expect(COMMA);
}
}
p.expect(R_PAREN);
}