1 ! Copyright (C) 2008 Alex Chapman
2 ! Copyright (C) 2012 John Benediktsson
3 ! See http://factorcode.org/license.txt for BSD license
4 USING: accessors circular kernel math sequences sequences.private ;
5 IN: sequences.repeating
8 { circular circular read-only }
9 { length integer read-only } ;
11 : <cycles> ( seq length -- cycles )
12 [ <circular> ] dip cycles boa ;
14 : cycle ( seq length -- new-seq )
15 dupd <cycles> swap like ;
17 M: cycles length length>> ;
19 M: cycles set-length length<< ;
21 M: cycles virtual@ ( n seq -- n' seq' ) circular>> ;
23 M: cycles virtual-exemplar circular>> ;
25 INSTANCE: cycles virtual-sequence
28 { seq sequence read-only }
29 { length integer read-only } ;
31 : <repeats> ( seq times -- repeats )
32 over length * repeats boa ;
34 : repeat ( seq times -- new-seq )
35 dupd <repeats> swap like ;
37 M: repeats length length>> ;
40 [ length>> / ] [ seq>> [ length * >integer ] keep nth ] bi ;
42 INSTANCE: repeats immutable-sequence