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Improve readability of the parser code

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This commit is contained in:
Pavan Kumar Sunkara 2024-03-06 21:09:30 +00:00
parent 00a0125372
commit 2a41b2cd94
10 changed files with 38 additions and 63 deletions
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14
crates/parser/src/grammar/expressions.rs
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@ -211,9 +211,8 @@ fn current_op(p: &Parser<'_>) -> (u8, SyntaxKind, Associativity) {
T![>] if p.at(T![>>]) => (9, T![>>], Left),
T![>] if p.at(T![>=]) => (5, T![>=], Left),
T![>] => (5, T![>], Left),
T![=] if p.at(T![=>]) => NOT_AN_OP,
T![=] if p.at(T![==]) => (5, T![==], Left),
T![=] => (1, T![=], Right),
T![=] if !p.at(T![=>]) => (1, T![=], Right),
T![<] if p.at(T![<=]) => (5, T![<=], Left),
T![<] if p.at(T![<<=]) => (1, T![<<=], Right),
T![<] if p.at(T![<<]) => (9, T![<<], Left),
@ -247,7 +246,7 @@ fn current_op(p: &Parser<'_>) -> (u8, SyntaxKind, Associativity) {
fn expr_bp(
p: &mut Parser<'_>,
m: Option<Marker>,
mut r: Restrictions,
r: Restrictions,
bp: u8,
) -> Option<(CompletedMarker, BlockLike)> {
let m = m.unwrap_or_else(|| {
@ -295,10 +294,6 @@ fn expr_bp(
let m = lhs.precede(p);
p.bump(op);
// test binop_resets_statementness
// fn f() { v = {1}&2; }
r = Restrictions { prefer_stmt: false, ..r };
if is_range {
// test postfix_range
// fn foo() {
@ -319,6 +314,9 @@ fn expr_bp(
Associativity::Left => op_bp + 1,
Associativity::Right => op_bp,
};
// test binop_resets_statementness
// fn f() { v = {1}&2; }
expr_bp(p, None, Restrictions { prefer_stmt: false, ..r }, op_bp);
lhs = m.complete(p, if is_range { RANGE_EXPR } else { BIN_EXPR });
}
@ -345,7 +343,7 @@ fn lhs(p: &mut Parser<'_>, r: Restrictions) -> Option<(CompletedMarker, BlockLik
T![&] => {
m = p.start();
p.bump(T![&]);
if p.at_contextual_kw(T![raw]) && (p.nth_at(1, T![mut]) || p.nth_at(1, T![const])) {
if p.at_contextual_kw(T![raw]) && [T![mut], T![const]].contains(&p.nth(1)) {
p.bump_remap(T![raw]);
p.bump_any();
} else {