nl_tokens: Resolve a string like foo [ 0 ] . bla [ test ]
pl_tokens: function accessObject ( obj , string ) { var m , pos = 0 ; while ( ( m = string . substring ( pos ) . match ( accessExp ) ) ) { //         .name or       ["foo"] or [0] var prop = m [ 1 ] || ( m [ 3 ] ? m [ 4 ] : + m [ 2 ] ) ; if ( obj === undefined ) { throw new FormatError ( accessObject , 'Cannot access property "{}" of undefined.' , <mask> ) ; } else { obj = obj [ prop ] ; } pos += m [ 0 ] . length ; } return obj ; }