nl_tokens: Helper method that expands a dotted string into MemberExpression
pl_tokens: function expandMemberExpression ( str ) { var segs = str . split ( "." ) ; var expr = types . memberExpression ( types . identifier ( segs [ 0 ] ) , types . identifier ( segs [ 1 ] ) ) ; for ( var i = 2 ; i < segs . length ; i ++ ) { expr = <mask> . memberExpression ( expr , types . identifier ( segs [ i ] ) ) ; } return expr ; }