expr = "!" expr  / disjunction
disjunction = primary "|" expr / conjunction
conjunction = primary "&" expr / primary
primary = symbol / "(" expr ")"
symbol = <%
for(var i=0;i<guardNames.length;i+=1){
    if(i>0){
        %> / "<%- guardNames[i] %>"<%
    } else {
        %>"<%- guardNames[i] %>"<%
    }
}
%>