rust/src/parser/event_parser/grammar/paths.rs

use super::*;

pub(crate) fn use_path(p: &mut Parser) {
    if !AnyOf(&[IDENT, SELF_KW, SUPER_KW, COLONCOLON]).is_ahead(p) {
        return;
    }
    let mut prev = p.mark();
    node(p, PATH, |p| {
        path_segment(p, true);
    });
    many(p, |p| {
        let curr = p.mark();
        node_if(p, COLONCOLON, PATH, |p| {
            path_segment(p, false);
            p.forward_parent(prev, curr);
            prev = curr;
        })
    });
}

fn path_segment(p: &mut Parser, first: bool) {
    node(p, PATH_SEGMENT, |p| {
        if first {
            p.eat(COLONCOLON);
        }
        match p.current() {
            IDENT | SELF_KW | SUPER_KW => {
                p.bump();
            },
            _ => {
                p.error()
                    .message("expected identifier")
                    .emit();
            }
        };
    })
}