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Parse builtin# syntax

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This commit is contained in:
Lukas Wirth 2023-09-05 10:36:35 +02:00
parent db4684ef6c
commit 9b8eb807a3
17 changed files with 264 additions and 88 deletions
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54
crates/parser/src/grammar/expressions/atom.rs
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@ -1,3 +1,5 @@
use crate::grammar::types::type_;
use super::*;
// test expr_literals
@ -73,6 +75,9 @@ pub(super) fn atom_expr(
if let Some(m) = literal(p) {
return Some((m, BlockLike::NotBlock));
}
if p.at_contextual_kw(T![builtin]) && p.nth_at(1, T![#]) {
return Some((builtin_expr(p)?, BlockLike::NotBlock));
}
if paths::is_path_start(p) {
return Some(path_expr(p, r));
}
@ -93,7 +98,6 @@ pub(super) fn atom_expr(
m.complete(p, UNDERSCORE_EXPR)
}
T![loop] => loop_expr(p, None),
T![box] => box_expr(p, None),
T![while] => while_expr(p, None),
T![try] => try_block_expr(p, None),
T![match] => match_expr(p),
@ -212,6 +216,38 @@ fn tuple_expr(p: &mut Parser<'_>) -> CompletedMarker {
m.complete(p, if saw_expr && !saw_comma { PAREN_EXPR } else { TUPLE_EXPR })
}
// test builtin_expr
// fn foo() {
// builtin#asm(0);
// builtin#format_args(0);
// builtin#builtin(0);
// }
fn builtin_expr(p: &mut Parser<'_>) -> Option<CompletedMarker> {
let m = p.start();
p.bump_remap(T![builtin]);
p.bump(T![#]);
if p.at_contextual_kw(T![offset_of]) {
p.expect(T!['(']);
type_(p);
p.bump(T![,]);
p.expect(T![')']);
Some(m.complete(p, OFFSET_OF_EXPR))
} else if p.at_contextual_kw(T![format_args]) {
p.expect(T!['(']);
expr(p);
p.expect(T![')']);
Some(m.complete(p, FORMAT_ARGS_EXPR))
} else if p.at_contextual_kw(T![asm]) {
p.expect(T!['(']);
expr(p);
p.expect(T![')']);
Some(m.complete(p, ASM_EXPR))
} else {
m.abandon(p);
None
}
}
// test array_expr
// fn foo() {
// [];
@ -662,19 +698,3 @@ fn try_block_expr(p: &mut Parser<'_>, m: Option<Marker>) -> CompletedMarker {
}
m.complete(p, BLOCK_EXPR)
}
// test box_expr
// fn foo() {
// let x = box 1i32;
// let y = (box 1i32, box 2i32);
// let z = Foo(box 1i32, box 2i32);
// }
fn box_expr(p: &mut Parser<'_>, m: Option<Marker>) -> CompletedMarker {
assert!(p.at(T![box]));
let m = m.unwrap_or_else(|| p.start());
p.bump(T![box]);
if p.at_ts(EXPR_FIRST) {
expr(p);
}
m.complete(p, BOX_EXPR)
}