1 ! Copyright (C) 2012 John Benediktsson, Doug Coleman
2 ! See http://factorcode.org/license.txt for BSD license
4 USING: arrays assocs assocs.private kernel math sequences ;
8 : assoc-sift ( assoc -- assoc' )
9 [ nip ] assoc-filter ; inline
11 : assoc-harvest ( assoc -- assoc' )
12 [ nip empty? not ] assoc-filter ; inline
14 : deep-at ( assoc seq -- value/f )
17 : zip-as ( keys values exemplar -- assoc )
19 [ 2array ] swap 2map-as
21 [ 2dup min-length ] dip new-assoc
22 [ [ set-at ] with-assoc 2each ] keep
25 : substitute! ( seq assoc -- seq )
28 : assoc-reduce ( ... assoc identity quot: ( ... prev key value -- next ) -- ... result )
29 [ >alist ] 2dip [ first2 ] prepose reduce ; inline
31 : reduce-keys ( ... assoc identity quot: ( ... prev elt -- ... next ) -- ... result )
32 [ drop ] prepose assoc-reduce ; inline
34 : reduce-values ( ... assoc identity quot: ( ... prev elt -- ... next ) -- ... result )
35 [ nip ] prepose assoc-reduce ; inline
37 : sum-keys ( assoc -- n ) 0 [ + ] reduce-keys ; inline
39 : sum-values ( assoc -- n ) 0 [ + ] reduce-values ; inline
41 : if-assoc-empty ( ..a assoc quot1: ( ..a -- ..b ) quot2: ( ..a assoc -- ..b ) -- ..b )
42 [ dup assoc-empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
44 : assoc-invert-as ( assoc exemplar -- newassoc )
45 [ swap ] swap assoc-map-as ;
47 : assoc-invert ( assoc -- newassoc )
50 : (assoc-merge) ( assoc1 assoc2 -- assoc1 )
51 over [ push-at ] with-assoc assoc-each ;
53 : assoc-merge ( seq -- merge )
54 H{ } clone [ (assoc-merge) ] reduce ;
56 GENERIC: delete-value-at ( value assoc -- )
58 M: assoc delete-value-at
59 [ value-at* ] keep swap [ delete-at ] [ 2drop ] if ;