perl6 grammar, recursions, actions

grammar-test.pl6

grammar logical-expr-grammer {
    rule TOP {
        ^ <expression> $
    }
    token identifier {
        <[A..Za..z0..9_-]>+
    }
    rule term {
          <identifier>
        | '(' <expression> ')'
    }
    rule expression {
# XXX this triggers term multiple time, is that good?
          <term> '|' <expression>
        | <term> '&' <expression>
        | '!' <term>
        | <term>
    }
}

class Actions {
    method term($/) {
        say "## term action";
    }
}

logical-expr-grammer.parse('varA', actions => Actions.new)