nl_tokens: Retrieve the value given a key if the value is present at the current level use it otherwise walk up the parent hierarchy and try again . If no matching key is found return undefined .
pl_tokens: function ( key ) { var dict = this . dict ; if ( dict . hasOwnProperty ( key ) ) { return dict [ key ] ; } if ( this . parent ) { return this . parent . <mask> ( key ) ; } }