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Revert to f6f7c5

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This commit is contained in:
DJMcNab 2018-12-19 18:33:36 +00:00
parent 7a8560ba38
commit cd8e33fb7e
3 changed files with 22 additions and 36 deletions
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39
crates/ra_syntax/src/grammar/expressions.rs
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@ -158,19 +158,18 @@ fn current_op(p: &Parser) -> (u8, Op) {
// Parses expression with binding power of at least bp.
fn expr_bp(p: &mut Parser, r: Restrictions, bp: u8) -> BlockLike {
let mut lhs = match lhs(p, r) {
(Some(lhs), macro_blocklike) => {
Some(lhs) => {
// test stmt_bin_expr_ambiguity
// fn foo() {
// let _ = {1} & 2;
// {1} &2;
// }
if r.prefer_stmt && (is_block(lhs.kind()) || macro_blocklike == Some(BlockLike::Block))
{
if r.prefer_stmt && is_block(lhs.kind()) {
return BlockLike::Block;
}
lhs
}
(None, _) => return BlockLike::NotBlock,
None => return BlockLike::NotBlock,
};
loop {
@ -214,7 +213,7 @@ const LHS_FIRST: TokenSet = token_set_union![
atom::ATOM_EXPR_FIRST,
];
fn lhs(p: &mut Parser, r: Restrictions) -> (Option<CompletedMarker>, Option<BlockLike>) {
fn lhs(p: &mut Parser, r: Restrictions) -> Option<CompletedMarker> {
let m;
let kind = match p.current() {
// test ref_expr
@ -247,29 +246,18 @@ fn lhs(p: &mut Parser, r: Restrictions) -> (Option<CompletedMarker>, Option<Bloc
if p.at_ts(EXPR_FIRST) {
expr_bp(p, r, 2);
}
return (Some(m.complete(p, RANGE_EXPR)), None);
return Some(m.complete(p, RANGE_EXPR));
}
_ => {
let (lhs_marker, macro_block_like) = atom::atom_expr(p, r);
if macro_block_like == Some(BlockLike::Block) {
return (lhs_marker, macro_block_like);
}
if let Some(lhs_marker) = lhs_marker {
return (Some(postfix_expr(p, r, lhs_marker)), macro_block_like);
} else {
return (None, None);
}
let lhs = atom::atom_expr(p, r)?;
return Some(postfix_expr(p, r, lhs));
}
};
expr_bp(p, r, 255);
(Some(m.complete(p, kind)), None)
Some(m.complete(p, kind))
}
fn postfix_expr(p: &mut Parser, r: Restrictions, mut lhs: CompletedMarker) -> CompletedMarker {
// Calls are disallowed if the type is a block and we prefer statements because the call cannot be disambiguated from a tuple
// E.g. `while true {break}();` is parsed as
// `while true {break}; ();`
let mut allow_calls = !r.prefer_stmt || !is_block(lhs.kind());
loop {
lhs = match p.current() {
@ -418,22 +406,21 @@ fn arg_list(p: &mut Parser) {
// let _ = ::a::<b>;
// let _ = format!();
// }
fn path_expr(p: &mut Parser, r: Restrictions) -> (CompletedMarker, Option<BlockLike>) {
fn path_expr(p: &mut Parser, r: Restrictions) -> CompletedMarker {
assert!(paths::is_path_start(p) || p.at(L_ANGLE));
let m = p.start();
paths::expr_path(p);
let res = match p.current() {
match p.current() {
L_CURLY if !r.forbid_structs => {
named_field_list(p);
m.complete(p, STRUCT_LIT)
}
EXCL => {
let block_like = items::macro_call_after_excl(p); // TODO: Use return type (BlockLike)
return (m.complete(p, MACRO_CALL), Some(block_like));
items::macro_call_after_excl(p); // TODO: Use return type (BlockLike)
m.complete(p, MACRO_CALL)
}
_ => m.complete(p, PATH_EXPR),
};
(res, None)
}
}
// test struct_lit