1 ! Copyright (C) 2009 Maximilian Lupke.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays assocs fry kernel math.ranges sequences ;
8 : prefixes ( seq -- prefixes )
9 dup length [1,b] [ head ] with map ;
11 : (abbrev) ( seq -- assoc )
12 [ prefixes ] keep 1array '[ _ ] H{ } map>assoc ;
14 : assoc-merge ( assoc1 assoc2 -- assoc3 )
15 [ '[ over _ at [ append ] when* ] assoc-map ] keep swap assoc-union ;
19 : abbrev ( seqs -- assoc )
20 [ (abbrev) ] map H{ } [ assoc-merge ] reduce ;
22 : unique-abbrev ( seqs -- assoc )
23 abbrev [ nip length 1 = ] assoc-filter ;