nl_tokens: Handles the dereferencing
pl_tokens: function ( expr ) { let result , offset ; const node = this . node ( "offsetlookup" ) ; if ( this . token === "[" ) { offset = this . next ( ) . read_expr ( ) ; if ( this . expect ( "]" ) ) this . next ( ) ; result = node ( expr , <mask> ) ; } else if ( this . token === this . tok . T_DOLLAR_OPEN_CURLY_BRACES ) { offset = this . read_encapsed_string_item ( false ) ; result = node ( expr , offset ) ; } return result ; }