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|
use super::*;
pub(super) fn use_item(p: &mut Parser) {
assert!(p.at(USE_KW));
p.bump();
use_tree(p);
p.expect(SEMI);
}
fn use_tree(p: &mut Parser) {
let la = p.nth(1);
let m = p.start();
match (p.current(), la) {
(STAR, _) => p.bump(),
(COLONCOLON, STAR) => {
p.bump();
p.bump();
}
(L_CURLY, _) | (COLONCOLON, L_CURLY) => {
if p.at(COLONCOLON) {
p.bump();
}
use_tree_list(p);
}
_ if paths::is_path_start(p) => {
paths::use_path(p);
match p.current() {
AS_KW => {
opt_alias(p);
}
COLONCOLON => {
p.bump();
match p.current() {
STAR => {
p.bump();
}
L_CURLY => use_tree_list(p),
_ => {
// is this unreachable?
p.error("expected `{` or `*`");
}
}
}
_ => (),
}
}
_ => {
m.abandon(p);
p.err_and_bump("expected one of `*`, `::`, `{`, `self`, `super`, `indent`");
return;
}
}
m.complete(p, USE_TREE);
}
fn use_tree_list(p: &mut Parser) {
assert!(p.at(L_CURLY));
let m = p.start();
p.bump();
while !p.at(EOF) && !p.at(R_CURLY) {
use_tree(p);
if !p.at(R_CURLY) {
p.expect(COMMA);
}
}
p.expect(R_CURLY);
m.complete(p, USE_TREE_LIST);
}
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