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internal: Improve parser recovery a bunch

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This commit is contained in:
Lukas Wirth 2023-02-11 18:06:07 +01:00
parent 5fdf640fb3
commit 1be24e0899
14 changed files with 249 additions and 134 deletions
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29
crates/parser/src/grammar/expressions.rs
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@ -68,6 +68,12 @@ pub(super) fn stmt(p: &mut Parser<'_>, semicolon: Semicolon) {
Err(m) => m,
};
if !p.at_ts(EXPR_FIRST) {
p.err_and_bump("expected expression, item or let statement");
m.abandon(p);
return;
}
if let Some((cm, blocklike)) = expr_stmt(p, Some(m)) {
if !(p.at(T!['}']) || (semicolon != Semicolon::Required && p.at(EOF))) {
// test no_semi_after_block
@ -227,6 +233,12 @@ fn expr_bp(
attributes::outer_attrs(p);
m
});
if !p.at_ts(EXPR_FIRST) {
p.err_recover("expected expression", atom::EXPR_RECOVERY_SET);
m.abandon(p);
return None;
}
let mut lhs = match lhs(p, r) {
Some((lhs, blocklike)) => {
let lhs = lhs.extend_to(p, m);
@ -551,6 +563,12 @@ fn cast_expr(p: &mut Parser<'_>, lhs: CompletedMarker) -> CompletedMarker {
m.complete(p, CAST_EXPR)
}
// test_err arg_list_recovery
// fn main() {
// foo(bar::);
// foo(bar:);
// foo(bar+);
// }
fn arg_list(p: &mut Parser<'_>) {
assert!(p.at(T!['(']));
let m = p.start();
@ -563,8 +581,15 @@ fn arg_list(p: &mut Parser<'_>) {
if !expr(p) {
break;
}
if !p.at(T![')']) && !p.expect(T![,]) {
break;
if !p.at(T![,]) {
if p.at_ts(EXPR_FIRST) {
p.error("expected `,`");
continue;
} else {
break;
}
} else {
p.bump(T![,]);
}
}
p.eat(T![')']);