1 ! Copyright (C) 2007, 2010 Slava Pestov, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs definitions effects hashtables
4 kernel kernel.private math sequences sequences.private words ;
9 ! We can't use n*quot, narray and firstn from generalizations because
10 ! they're macros, and macros use memoize!
11 : (n*quot) ( n quot -- quotquot )
12 <repetition> [ ] concat-as ;
14 : [nsequence] ( length exemplar -- quot )
15 [ [ [ 1 - ] keep ] dip '[ _ _ _ new-sequence ] ]
16 [ drop [ [ set-nth-unsafe ] 2keep [ 1 - ] dip ] (n*quot) ] 2bi
19 : [firstn] ( length -- quot )
21 [ [ nth-unsafe ] 2keep [ 1 + ] dip ] (n*quot)
24 : packer ( seq -- quot )
26 [ { [ f ] [ ] [ 2array ] [ 3array ] [ 4array ] } nth ]
27 [ { } [nsequence] ] if ;
29 : unpacker ( seq -- quot )
31 [ { [ drop ] [ ] [ first2-unsafe ] [ first3-unsafe ] [ first4-unsafe ] } nth ]
32 [ [firstn] ] if swap 1 >
33 [ [ { array } declare ] prepose ] when ;
35 : pack/unpack ( quot effect -- newquot )
36 [ in>> packer ] [ out>> unpacker ] bi surround ;
38 : unpack/pack ( quot effect -- newquot )
39 [ in>> unpacker ] [ out>> packer ] bi surround ;
41 : make/n ( table quot effect -- quot )
42 [ unpack/pack '[ _ _ cache ] ] keep pack/unpack ;
44 : make/0 ( table quot effect -- quot )
48 [ ] [ @ @ [ 0 rot set-nth-unsafe ] keep ] ?if
50 ] keep unpacker compose ;
52 : make-memoizer ( table quot effect -- quot )
53 dup in>> length zero? [ make/0 ] [ make/n ] if ;
57 : (define-memoized) ( word quot effect hashtable -- )
58 [ [ drop "memo-quot" set-word-prop ] ] dip
59 '[ 2drop _ "memoize" set-word-prop ]
60 [ [ [ dup "memoize" word-prop ] 2dip make-memoizer ] keep define-declared ]
63 : define-memoized ( word quot effect -- )
64 dup in>> length zero? [ f 1array ] [ H{ } clone ] if
67 : define-identity-memoized ( word quot effect -- )
68 dup in>> length zero? [ f 1array ] [ IH{ } clone ] if
71 PREDICATE: memoized < word "memoize" word-prop >boolean ;
74 def>> ?first hashtable? \ MEMO: \ IDENTITY-MEMO: ? \ ; ;
76 M: memoized definition "memo-quot" word-prop ;
78 M: memoized reset-word
80 [ { "memoize" "memo-quot" } remove-word-props ]
83 : memoize-quot ( quot effect -- memo-quot )
84 dup in>> length zero? [ f 1array ] [ H{ } clone ] if
87 : reset-memoized ( word -- )
88 "memoize" word-prop dup sequence?
89 [ f swap set-first ] [ clear-assoc ] if ;
91 : invalidate-memoized ( inputs... word -- )
92 [ stack-effect in>> packer call ]
94 "memoize" word-prop dup sequence?
95 [ f swap set-first ] [ delete-at ] if
99 \ invalidate-memoized t "no-compile" set-word-prop