53 lines
1 KiB
Rust
53 lines
1 KiB
Rust
use super::*;
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pub(super) fn pattern(p: &mut Parser) {
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match p.current() {
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UNDERSCORE => placeholder_pat(p),
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AMPERSAND => ref_pat(p),
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IDENT | REF_KW | MUT_KW => bind_pat(p),
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_ => p.err_and_bump("expected pattern"),
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}
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}
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// test placeholder_pat
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// fn main() { let _ = (); }
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fn placeholder_pat(p: &mut Parser) {
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assert!(p.at(UNDERSCORE));
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let m = p.start();
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p.bump();
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m.complete(p, PLACEHOLDER_PAT);
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}
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// test ref_pat
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// fn main() {
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// let &a = ();
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// let &mut b = ();
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// }
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fn ref_pat(p: &mut Parser) {
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assert!(p.at(AMPERSAND));
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let m = p.start();
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p.bump();
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p.eat(MUT_KW);
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pattern(p);
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m.complete(p, REF_PAT);
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}
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// test bind_pat
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// fn main() {
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// let a = ();
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// let mut b = ();
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// let ref c = ();
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// let ref mut d = ();
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// let e @ _ = ();
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// let ref mut f @ g @ _ = ();
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// }
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fn bind_pat(p: &mut Parser) {
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let m = p.start();
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p.eat(REF_KW);
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p.eat(MUT_KW);
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name(p);
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if p.eat(AT) {
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pattern(p);
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}
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m.complete(p, BIND_PAT);
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}
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